* [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap
@ 2021-04-13 2:59 Václav Kubernát
2021-04-13 2:59 ` [PATCH v2 2/5] hwmon: (max31790) Fix and split pwm*_enable Václav Kubernát
` (6 more replies)
0 siblings, 7 replies; 18+ messages in thread
From: Václav Kubernát @ 2021-04-13 2:59 UTC (permalink / raw)
Cc: Václav Kubernát, Jean Delvare, Guenter Roeck,
Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
Converting the driver to use regmap makes it more generic. It also makes
it a lot easier to debug through debugfs.
Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
---
drivers/hwmon/Kconfig | 1 +
drivers/hwmon/max31790.c | 254 ++++++++++++++++++++-------------------
2 files changed, 133 insertions(+), 122 deletions(-)
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 1ecf697d8d99..9f11d036c316 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1095,6 +1095,7 @@ config SENSORS_MAX6697
config SENSORS_MAX31790
tristate "Maxim MAX31790 sensor chip"
depends on I2C
+ select REGMAP_I2C
help
If you say yes here you get support for 6-Channel PWM-Output
Fan RPM Controller.
diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index 2c6b333a28e9..e3765ce4444a 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -12,6 +12,7 @@
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/module.h>
+#include <linux/regmap.h>
#include <linux/slab.h>
/* MAX31790 registers */
@@ -46,92 +47,53 @@
#define NR_CHANNEL 6
+#define MAX31790_REG_USER_BYTE_67 0x67
+
+#define BULK_TO_U16(msb, lsb) (((msb) << 8) + (lsb))
+#define U16_MSB(num) (((num) & 0xFF00) >> 8)
+#define U16_LSB(num) ((num) & 0x00FF)
+
+static const struct regmap_range max31790_ro_range = {
+ .range_min = MAX31790_REG_TACH_COUNT(0),
+ .range_max = MAX31790_REG_PWMOUT(0) - 1,
+};
+
+static const struct regmap_access_table max31790_wr_table = {
+ .no_ranges = &max31790_ro_range,
+ .n_no_ranges = 1,
+};
+
+static const struct regmap_range max31790_volatile_ranges[] = {
+ regmap_reg_range(MAX31790_REG_TACH_COUNT(0), MAX31790_REG_TACH_COUNT(12)),
+ regmap_reg_range(MAX31790_REG_FAN_FAULT_STATUS2, MAX31790_REG_FAN_FAULT_STATUS1),
+};
+
+static const struct regmap_access_table max31790_volatile_table = {
+ .no_ranges = max31790_volatile_ranges,
+ .n_no_ranges = 2,
+ .n_yes_ranges = 0
+};
+
+static const struct regmap_config max31790_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .reg_stride = 1,
+ .max_register = MAX31790_REG_USER_BYTE_67,
+ .wr_table = &max31790_wr_table,
+ .volatile_table = &max31790_volatile_table
+};
+
/*
* Client data (each client gets its own)
*/
struct max31790_data {
- struct i2c_client *client;
+ struct regmap *regmap;
+
struct mutex update_lock;
- bool valid; /* zero until following fields are valid */
- unsigned long last_updated; /* in jiffies */
-
- /* register values */
u8 fan_config[NR_CHANNEL];
u8 fan_dynamics[NR_CHANNEL];
- u16 fault_status;
- u16 tach[NR_CHANNEL * 2];
- u16 pwm[NR_CHANNEL];
- u16 target_count[NR_CHANNEL];
};
-static struct max31790_data *max31790_update_device(struct device *dev)
-{
- struct max31790_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- struct max31790_data *ret = data;
- int i;
- int rv;
-
- mutex_lock(&data->update_lock);
-
- if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
- rv = i2c_smbus_read_byte_data(client,
- MAX31790_REG_FAN_FAULT_STATUS1);
- if (rv < 0)
- goto abort;
- data->fault_status = rv & 0x3F;
-
- rv = i2c_smbus_read_byte_data(client,
- MAX31790_REG_FAN_FAULT_STATUS2);
- if (rv < 0)
- goto abort;
- data->fault_status |= (rv & 0x3F) << 6;
-
- for (i = 0; i < NR_CHANNEL; i++) {
- rv = i2c_smbus_read_word_swapped(client,
- MAX31790_REG_TACH_COUNT(i));
- if (rv < 0)
- goto abort;
- data->tach[i] = rv;
-
- if (data->fan_config[i]
- & MAX31790_FAN_CFG_TACH_INPUT) {
- rv = i2c_smbus_read_word_swapped(client,
- MAX31790_REG_TACH_COUNT(NR_CHANNEL
- + i));
- if (rv < 0)
- goto abort;
- data->tach[NR_CHANNEL + i] = rv;
- } else {
- rv = i2c_smbus_read_word_swapped(client,
- MAX31790_REG_PWMOUT(i));
- if (rv < 0)
- goto abort;
- data->pwm[i] = rv;
-
- rv = i2c_smbus_read_word_swapped(client,
- MAX31790_REG_TARGET_COUNT(i));
- if (rv < 0)
- goto abort;
- data->target_count[i] = rv;
- }
- }
-
- data->last_updated = jiffies;
- data->valid = true;
- }
- goto done;
-
-abort:
- data->valid = false;
- ret = ERR_PTR(rv);
-
-done:
- mutex_unlock(&data->update_lock);
-
- return ret;
-}
-
static const u8 tach_period[8] = { 1, 2, 4, 8, 16, 32, 32, 32 };
static u8 get_tach_period(u8 fan_dynamics)
@@ -159,28 +121,75 @@ static u8 bits_for_tach_period(int rpm)
return bits;
}
+static int read_reg_byte(struct regmap *regmap, u8 reg)
+{
+ int rv;
+ int val;
+
+ rv = regmap_read(regmap, reg, &val);
+ if (rv < 0)
+ return rv;
+
+ return val;
+}
+
+static int read_reg_word(struct regmap *regmap, u8 reg)
+{
+ int rv;
+ u8 val_bulk[2];
+
+ rv = regmap_bulk_read(regmap, reg, val_bulk, 2);
+ if (rv < 0)
+ return rv;
+
+ return BULK_TO_U16(val_bulk[0], val_bulk[1]);
+}
+
+static int write_reg_word(struct regmap *regmap, u8 reg, u16 val)
+{
+ u8 bulk_val[2];
+
+ bulk_val[0] = U16_MSB(val);
+ bulk_val[1] = U16_LSB(val);
+
+ return regmap_bulk_write(regmap, reg, bulk_val, 2);
+}
+
static int max31790_read_fan(struct device *dev, u32 attr, int channel,
long *val)
{
- struct max31790_data *data = max31790_update_device(dev);
- int sr, rpm;
-
- if (IS_ERR(data))
- return PTR_ERR(data);
+ struct max31790_data *data = dev_get_drvdata(dev);
+ struct regmap *regmap = data->regmap;
+ int tach, fault;
switch (attr) {
case hwmon_fan_input:
- sr = get_tach_period(data->fan_dynamics[channel]);
- rpm = RPM_FROM_REG(data->tach[channel], sr);
- *val = rpm;
+ tach = read_reg_word(regmap, MAX31790_REG_TACH_COUNT(channel));
+ if (tach < 0)
+ return tach;
+
+ *val = RPM_FROM_REG(tach, get_tach_period(data->fan_dynamics[channel]));
return 0;
case hwmon_fan_target:
- sr = get_tach_period(data->fan_dynamics[channel]);
- rpm = RPM_FROM_REG(data->target_count[channel], sr);
- *val = rpm;
+ tach = read_reg_word(regmap, MAX31790_REG_TARGET_COUNT(channel));
+ if (tach < 0)
+ return tach;
+
+ *val = RPM_FROM_REG(tach, get_tach_period(data->fan_dynamics[channel]));
return 0;
case hwmon_fan_fault:
- *val = !!(data->fault_status & (1 << channel));
+ if (channel > 6)
+ fault = read_reg_byte(regmap, MAX31790_REG_FAN_FAULT_STATUS2);
+ else
+ fault = read_reg_byte(regmap, MAX31790_REG_FAN_FAULT_STATUS1);
+
+ if (fault < 0)
+ return fault;
+
+ if (channel > 6)
+ *val = !!(fault & (1 << (channel - 6)));
+ else
+ *val = !!(fault & (1 << channel));
return 0;
default:
return -EOPNOTSUPP;
@@ -191,7 +200,7 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
long val)
{
struct max31790_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
+ struct regmap *regmap = data->regmap;
int target_count;
int err = 0;
u8 bits;
@@ -207,9 +216,10 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
((data->fan_dynamics[channel] &
~MAX31790_FAN_DYN_SR_MASK) |
(bits << MAX31790_FAN_DYN_SR_SHIFT));
- err = i2c_smbus_write_byte_data(client,
- MAX31790_REG_FAN_DYNAMICS(channel),
- data->fan_dynamics[channel]);
+
+ err = regmap_write(regmap,
+ MAX31790_REG_FAN_DYNAMICS(channel),
+ data->fan_dynamics[channel]);
if (err < 0)
break;
@@ -217,11 +227,11 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
target_count = RPM_TO_REG(val, sr);
target_count = clamp_val(target_count, 0x1, 0x7FF);
- data->target_count[channel] = target_count << 5;
+ target_count = target_count << 5;
- err = i2c_smbus_write_word_swapped(client,
- MAX31790_REG_TARGET_COUNT(channel),
- data->target_count[channel]);
+ err = write_reg_word(regmap,
+ MAX31790_REG_TARGET_COUNT(channel),
+ target_count);
break;
default:
err = -EOPNOTSUPP;
@@ -258,22 +268,22 @@ static umode_t max31790_fan_is_visible(const void *_data, u32 attr, int channel)
static int max31790_read_pwm(struct device *dev, u32 attr, int channel,
long *val)
{
- struct max31790_data *data = max31790_update_device(dev);
- u8 fan_config;
-
- if (IS_ERR(data))
- return PTR_ERR(data);
-
- fan_config = data->fan_config[channel];
+ struct max31790_data *data = dev_get_drvdata(dev);
+ struct regmap *regmap = data->regmap;
+ int read;
switch (attr) {
case hwmon_pwm_input:
- *val = data->pwm[channel] >> 8;
+ read = read_reg_word(regmap, MAX31790_REG_PWMOUT(channel));
+ if (read < 0)
+ return read;
+
+ *val = read >> 8;
return 0;
case hwmon_pwm_enable:
- if (fan_config & MAX31790_FAN_CFG_RPM_MODE)
+ if (data->fan_config[channel] & MAX31790_FAN_CFG_RPM_MODE)
*val = 2;
- else if (fan_config & MAX31790_FAN_CFG_TACH_INPUT_EN)
+ else if (data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN)
*val = 1;
else
*val = 0;
@@ -287,7 +297,7 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
long val)
{
struct max31790_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
+ struct regmap *regmap = data->regmap;
u8 fan_config;
int err = 0;
@@ -299,10 +309,7 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
err = -EINVAL;
break;
}
- data->pwm[channel] = val << 8;
- err = i2c_smbus_write_word_swapped(client,
- MAX31790_REG_PWMOUT(channel),
- data->pwm[channel]);
+ err = write_reg_word(regmap, MAX31790_REG_PWMOUT(channel), val << 8);
break;
case hwmon_pwm_enable:
fan_config = data->fan_config[channel];
@@ -321,9 +328,9 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
break;
}
data->fan_config[channel] = fan_config;
- err = i2c_smbus_write_byte_data(client,
- MAX31790_REG_FAN_CONFIG(channel),
- fan_config);
+ err = regmap_write(regmap,
+ MAX31790_REG_FAN_CONFIG(channel),
+ fan_config);
break;
default:
err = -EOPNOTSUPP;
@@ -426,20 +433,18 @@ static const struct hwmon_chip_info max31790_chip_info = {
.info = max31790_info,
};
-static int max31790_init_client(struct i2c_client *client,
+static int max31790_init_client(struct regmap *regmap,
struct max31790_data *data)
{
int i, rv;
for (i = 0; i < NR_CHANNEL; i++) {
- rv = i2c_smbus_read_byte_data(client,
- MAX31790_REG_FAN_CONFIG(i));
+ rv = read_reg_byte(regmap, MAX31790_REG_FAN_CONFIG(i % NR_CHANNEL));
if (rv < 0)
return rv;
data->fan_config[i] = rv;
- rv = i2c_smbus_read_byte_data(client,
- MAX31790_REG_FAN_DYNAMICS(i));
+ rv = read_reg_byte(regmap, MAX31790_REG_FAN_DYNAMICS(i));
if (rv < 0)
return rv;
data->fan_dynamics[i] = rv;
@@ -464,13 +469,18 @@ static int max31790_probe(struct i2c_client *client)
if (!data)
return -ENOMEM;
- data->client = client;
mutex_init(&data->update_lock);
+ data->regmap = devm_regmap_init_i2c(client, &max31790_regmap_config);
+ if (IS_ERR(data->regmap)) {
+ dev_err(dev, "failed to allocate register map\n");
+ return PTR_ERR(data->regmap);
+ }
+
/*
* Initialize the max31790 chip
*/
- err = max31790_init_client(client, data);
+ err = max31790_init_client(data->regmap, data);
if (err)
return err;
--
2.31.1
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v2 2/5] hwmon: (max31790) Fix and split pwm*_enable
2021-04-13 2:59 [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap Václav Kubernát
@ 2021-04-13 2:59 ` Václav Kubernát
[not found] ` <20210419223340.GA229491@roeck-us.net>
2021-04-13 2:59 ` [PATCH v2 3/5] hwmon: (max31790) Show 0 RPM/fault when input disabled Václav Kubernát
` (5 subsequent siblings)
6 siblings, 1 reply; 18+ messages in thread
From: Václav Kubernát @ 2021-04-13 2:59 UTC (permalink / raw)
Cc: Václav Kubernát, Jean Delvare, Guenter Roeck,
Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
In the old code, pwm*_enable does two things. Firstly, it sets whether
the chip should run in PWM or RPM mode. Secondly, it tells the chip
whether it should monitor fan RPM. However, these two settings aren't
tied together, so they shouldn't be set with a single value. In the new
code, fan*_enable now controls fan RPM monitoring (pwm*_enable no longer
controls that).
According to the sysfs hwmon documentation, pwm*_enable has three
possible values, 0 for "no control / full-speed", 1 for manual mode, and
2+ for automatic. The old code works fine for 1 and 2, but 0 only
differs from 1 in that it just turns off fan speed monitoring. The chip
actually does have a way to turn off fan controls (and only monitor),
but what that does is that it sets PWM to 0% duty cycle (which is the
opposite to full-speed) AND it also turns off fan speed monitoring.
Because of this, I implemented the 0 value by setting PWM mode to 100%.
This method does come with a problem: it is impossible to differentiate
between full-speed and PWM mode just from the values on the chip. The
new code solves this by saving a value indicating whether we're in
full-speed mode. This value is initialized to 0, so full-speed mode
won't persist across reboots.
These two changes are closely connected together, mainly because the
detection of the pwm*_enable value depended on whether fan speed
monitoring is enabled (which is now controlled as written in the first
paragraph).
Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
---
Documentation/hwmon/max31790.rst | 8 +--
drivers/hwmon/max31790.c | 87 ++++++++++++++++++++++----------
2 files changed, 66 insertions(+), 29 deletions(-)
diff --git a/Documentation/hwmon/max31790.rst b/Documentation/hwmon/max31790.rst
index f301385d8cef..8979c8a02cd1 100644
--- a/Documentation/hwmon/max31790.rst
+++ b/Documentation/hwmon/max31790.rst
@@ -34,10 +34,12 @@ also be configured to serve as tachometer inputs.
Sysfs entries
-------------
-================== === =======================================================
+================== === =============================================================
+fan[1-12]_enable RW enable fan speed monitoring
fan[1-12]_input RO fan tachometer speed in RPM
fan[1-12]_fault RO fan experienced fault
fan[1-6]_target RW desired fan speed in RPM
-pwm[1-6]_enable RW regulator mode, 0=disabled, 1=manual mode, 2=rpm mode
+pwm[1-6]_enable RW regulator mode, 0=full speed, 1=manual (pwm) mode, 2=rpm mode
+ setting rpm mode sets fan*_enable to 1
pwm[1-6] RW fan target duty cycle (0-255)
-================== === =======================================================
+================== === =============================================================
diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index e3765ce4444a..ecdd55e12ffe 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -39,6 +39,7 @@
#define FAN_RPM_MIN 120
#define FAN_RPM_MAX 7864320
+#define MAX_PWM 0XFF80
#define RPM_FROM_REG(reg, sr) (((reg) >> 4) ? \
((60 * (sr) * 8192) / ((reg) >> 4)) : \
@@ -90,6 +91,7 @@ struct max31790_data {
struct regmap *regmap;
struct mutex update_lock;
+ bool full_speed[NR_CHANNEL];
u8 fan_config[NR_CHANNEL];
u8 fan_dynamics[NR_CHANNEL];
};
@@ -191,6 +193,9 @@ static int max31790_read_fan(struct device *dev, u32 attr, int channel,
else
*val = !!(fault & (1 << channel));
return 0;
+ case hwmon_fan_enable:
+ *val = !!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN);
+ return 0;
default:
return -EOPNOTSUPP;
}
@@ -233,6 +238,15 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
MAX31790_REG_TARGET_COUNT(channel),
target_count);
break;
+ case hwmon_fan_enable:
+ if (val == 0)
+ data->fan_config[channel] &= ~MAX31790_FAN_CFG_TACH_INPUT_EN;
+ else
+ data->fan_config[channel] |= MAX31790_FAN_CFG_TACH_INPUT_EN;
+ err = regmap_write(regmap,
+ MAX31790_REG_FAN_CONFIG(channel),
+ data->fan_config[channel]);
+ break;
default:
err = -EOPNOTSUPP;
break;
@@ -260,6 +274,11 @@ static umode_t max31790_fan_is_visible(const void *_data, u32 attr, int channel)
!(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
return 0644;
return 0;
+ case hwmon_fan_enable:
+ if (channel < NR_CHANNEL ||
+ (fan_config & MAX31790_FAN_CFG_TACH_INPUT))
+ return 0644;
+ return 0;
default:
return 0;
}
@@ -281,12 +300,12 @@ static int max31790_read_pwm(struct device *dev, u32 attr, int channel,
*val = read >> 8;
return 0;
case hwmon_pwm_enable:
- if (data->fan_config[channel] & MAX31790_FAN_CFG_RPM_MODE)
+ if (data->full_speed[channel])
+ *val = 0;
+ else if (data->fan_config[channel] & MAX31790_FAN_CFG_RPM_MODE)
*val = 2;
- else if (data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN)
+ else
*val = 1;
- else
- *val = 0;
return 0;
default:
return -EOPNOTSUPP;
@@ -305,28 +324,42 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
switch (attr) {
case hwmon_pwm_input:
- if (val < 0 || val > 255) {
+ if (data->full_speed[channel] || val < 0 || val > 255) {
err = -EINVAL;
break;
}
+
err = write_reg_word(regmap, MAX31790_REG_PWMOUT(channel), val << 8);
break;
case hwmon_pwm_enable:
fan_config = data->fan_config[channel];
- if (val == 0) {
- fan_config &= ~(MAX31790_FAN_CFG_TACH_INPUT_EN |
- MAX31790_FAN_CFG_RPM_MODE);
- } else if (val == 1) {
- fan_config = (fan_config |
- MAX31790_FAN_CFG_TACH_INPUT_EN) &
- ~MAX31790_FAN_CFG_RPM_MODE;
+ if (val == 0 || val == 1) {
+ fan_config &= ~MAX31790_FAN_CFG_RPM_MODE;
} else if (val == 2) {
- fan_config |= MAX31790_FAN_CFG_TACH_INPUT_EN |
- MAX31790_FAN_CFG_RPM_MODE;
+ fan_config |= MAX31790_FAN_CFG_RPM_MODE;
} else {
err = -EINVAL;
break;
}
+
+ /*
+ * The chip sets PWM to zero when using its "monitor only" mode
+ * and 0 means full speed.
+ */
+ if (val == 0) {
+ data->full_speed[channel] = true;
+ err = write_reg_word(regmap, MAX31790_REG_PWMOUT(channel), MAX_PWM);
+ } else {
+ data->full_speed[channel] = false;
+ }
+
+ /*
+ * RPM mode implies enabled TACH input, so enable it in RPM
+ * mode.
+ */
+ if (val == 2)
+ fan_config |= MAX31790_FAN_CFG_TACH_INPUT_EN;
+
data->fan_config[channel] = fan_config;
err = regmap_write(regmap,
MAX31790_REG_FAN_CONFIG(channel),
@@ -400,18 +433,18 @@ static umode_t max31790_is_visible(const void *data,
static const struct hwmon_channel_info *max31790_info[] = {
HWMON_CHANNEL_INFO(fan,
- HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_FAULT),
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT),
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
@@ -448,6 +481,8 @@ static int max31790_init_client(struct regmap *regmap,
if (rv < 0)
return rv;
data->fan_dynamics[i] = rv;
+
+ data->full_speed[i] = false;
}
return 0;
--
2.31.1
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v2 3/5] hwmon: (max31790) Show 0 RPM/fault when input disabled
2021-04-13 2:59 [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap Václav Kubernát
2021-04-13 2:59 ` [PATCH v2 2/5] hwmon: (max31790) Fix and split pwm*_enable Václav Kubernát
@ 2021-04-13 2:59 ` Václav Kubernát
2021-04-13 2:59 ` [PATCH v2 4/5] hwmon: (max31790) Allow setting fan*_div Václav Kubernát
` (4 subsequent siblings)
6 siblings, 0 replies; 18+ messages in thread
From: Václav Kubernát @ 2021-04-13 2:59 UTC (permalink / raw)
Cc: Václav Kubernát, Jean Delvare, Guenter Roeck,
Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
When fan speed input is disabled, it makes no sense to show values in
fan*_input and fan*_fault.
Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
---
drivers/hwmon/max31790.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index ecdd55e12ffe..4fea32ff63bb 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -166,6 +166,9 @@ static int max31790_read_fan(struct device *dev, u32 attr, int channel,
switch (attr) {
case hwmon_fan_input:
+ if (!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN))
+ return -ENODATA;
+
tach = read_reg_word(regmap, MAX31790_REG_TACH_COUNT(channel));
if (tach < 0)
return tach;
@@ -180,6 +183,11 @@ static int max31790_read_fan(struct device *dev, u32 attr, int channel,
*val = RPM_FROM_REG(tach, get_tach_period(data->fan_dynamics[channel]));
return 0;
case hwmon_fan_fault:
+ if (!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN)) {
+ *val = 0;
+ return 0;
+ }
+
if (channel > 6)
fault = read_reg_byte(regmap, MAX31790_REG_FAN_FAULT_STATUS2);
else
--
2.31.1
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v2 4/5] hwmon: (max31790) Allow setting fan*_div
2021-04-13 2:59 [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap Václav Kubernát
2021-04-13 2:59 ` [PATCH v2 2/5] hwmon: (max31790) Fix and split pwm*_enable Václav Kubernát
2021-04-13 2:59 ` [PATCH v2 3/5] hwmon: (max31790) Show 0 RPM/fault when input disabled Václav Kubernát
@ 2021-04-13 2:59 ` Václav Kubernát
2021-04-13 2:59 ` [PATCH v2 5/5] hwmon: (max31790) Update documentation Václav Kubernát
` (3 subsequent siblings)
6 siblings, 0 replies; 18+ messages in thread
From: Václav Kubernát @ 2021-04-13 2:59 UTC (permalink / raw)
Cc: Václav Kubernát, Jean Delvare, Guenter Roeck,
Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
Right now, the divisor (which determines the speed range) is only set
when in RPM mode. However, the speed range also affects the input RPM,
which means, to get more accurate readings, this speed range needs to be
set.
Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
---
Documentation/hwmon/max31790.rst | 1 +
drivers/hwmon/max31790.c | 66 ++++++++++++++++++++++++++------
2 files changed, 55 insertions(+), 12 deletions(-)
diff --git a/Documentation/hwmon/max31790.rst b/Documentation/hwmon/max31790.rst
index 8979c8a02cd1..2979addeac8f 100644
--- a/Documentation/hwmon/max31790.rst
+++ b/Documentation/hwmon/max31790.rst
@@ -38,6 +38,7 @@ Sysfs entries
fan[1-12]_enable RW enable fan speed monitoring
fan[1-12]_input RO fan tachometer speed in RPM
fan[1-12]_fault RO fan experienced fault
+fan[1-12]_div RW set the measurable speed range, not available in RPM mode
fan[1-6]_target RW desired fan speed in RPM
pwm[1-6]_enable RW regulator mode, 0=full speed, 1=manual (pwm) mode, 2=rpm mode
setting rpm mode sets fan*_enable to 1
diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index 4fea32ff63bb..5fdfbf0f2809 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -157,6 +157,26 @@ static int write_reg_word(struct regmap *regmap, u8 reg, u16 val)
return regmap_bulk_write(regmap, reg, bulk_val, 2);
}
+static int bits_for_speed_range(long speed_range)
+{
+ switch (speed_range) {
+ case 1:
+ return 0x0;
+ case 2:
+ return 0x1;
+ case 4:
+ return 0x2;
+ case 8:
+ return 0x3;
+ case 16:
+ return 0x4;
+ case 32:
+ return 0x5;
+ default:
+ return -1;
+ }
+}
+
static int max31790_read_fan(struct device *dev, u32 attr, int channel,
long *val)
{
@@ -204,6 +224,9 @@ static int max31790_read_fan(struct device *dev, u32 attr, int channel,
case hwmon_fan_enable:
*val = !!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN);
return 0;
+ case hwmon_fan_div:
+ *val = get_tach_period(data->fan_config[channel]);
+ return 0;
default:
return -EOPNOTSUPP;
}
@@ -255,6 +278,24 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
MAX31790_REG_FAN_CONFIG(channel),
data->fan_config[channel]);
break;
+ case hwmon_fan_div:
+ if (data->fan_config[channel] & MAX31790_FAN_CFG_RPM_MODE) {
+ err = -EINVAL;
+ break;
+ }
+ sr = bits_for_speed_range(val);
+ if (sr < 0) {
+ err = -EINVAL;
+ break;
+ }
+
+ data->fan_dynamics[channel] = ((data->fan_dynamics[channel] &
+ ~MAX31790_FAN_DYN_SR_MASK) |
+ (sr << MAX31790_FAN_DYN_SR_SHIFT));
+ err = regmap_write(regmap,
+ MAX31790_REG_FAN_DYNAMICS(channel),
+ data->fan_dynamics[channel]);
+ break;
default:
err = -EOPNOTSUPP;
break;
@@ -283,6 +324,7 @@ static umode_t max31790_fan_is_visible(const void *_data, u32 attr, int channel)
return 0644;
return 0;
case hwmon_fan_enable:
+ case hwmon_fan_div:
if (channel < NR_CHANNEL ||
(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
return 0644;
@@ -441,18 +483,18 @@ static umode_t max31790_is_visible(const void *data,
static const struct hwmon_channel_info *max31790_info[] = {
HWMON_CHANNEL_INFO(fan,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT),
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT),
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
--
2.31.1
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v2 5/5] hwmon: (max31790) Update documentation
2021-04-13 2:59 [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap Václav Kubernát
` (2 preceding siblings ...)
2021-04-13 2:59 ` [PATCH v2 4/5] hwmon: (max31790) Allow setting fan*_div Václav Kubernát
@ 2021-04-13 2:59 ` Václav Kubernát
2021-04-13 3:10 ` [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap Václav Kubernát
` (2 subsequent siblings)
6 siblings, 0 replies; 18+ messages in thread
From: Václav Kubernát @ 2021-04-13 2:59 UTC (permalink / raw)
Cc: Václav Kubernát, Jean Delvare, Guenter Roeck,
Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
The conditions for fan fault and its connection to the PWM mode are now
documented.
The pwm_rate_of_change and fan_window are now mentioned. According to
our testing with Sunon PF36281BX-000U-S99, these values are crucial in
how RPM mode works and how long it takes for the RPM to stabilize. For
example, setting 5000 RPM (the fan goes up to 23000), the
pwm_rate_of_change needed to be changed to the lowest possible value,
otherwise the chip would just go from pwm 0 to pwm 60 back and forth and
never achieving 5000 RPM (and also signaling fan fault). Based on this
testing, we found out that the pwm_rate_of_change and fan_window values
need to be changed manually by the user, based on the user's exact fan
configuration.
Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
---
Documentation/hwmon/max31790.rst | 41 +++++++++++++++++++++++++++++++-
1 file changed, 40 insertions(+), 1 deletion(-)
diff --git a/Documentation/hwmon/max31790.rst b/Documentation/hwmon/max31790.rst
index 2979addeac8f..6056b67c3a95 100644
--- a/Documentation/hwmon/max31790.rst
+++ b/Documentation/hwmon/max31790.rst
@@ -30,6 +30,44 @@ monitoring and control of fan RPM as well as detection of fan failure.
Six pins are dedicated tachometer inputs. Any of the six PWM outputs can
also be configured to serve as tachometer inputs.
+About pwm[1-6]_enable
+---------------------
+0 - full-speed
+ The chip doesn't have a specific way to set "full speed", so setting
+ pwm[1-6]_enable to 0 is just "set PWM mode with 255 duty cycle".
+1 - PWM mode
+ Fan speed is controlled by writing a value to pwm[1-6].
+2 - RPM mode
+ Fan speed is controlled by writing a value to fan[1-6]_target.
+
+About fan[1-6]_fault
+--------------------
+In PWM (or full-speed) mode, if the input RPM goes below what is set
+in fan[1-6]_target, fan[1-6]_fault gets set to 1. In other words,
+fan[1-6]_target works as the minimum input RPM before a fan fault goes off.
+
+In RPM mode, fan fault is set when the fan spins "too slowly" (exact
+conditions are in the datasheet). RPM mode depends on four variables:
+ target_speed: This is set by fan[1-6]_target.
+ speed_range: This is set automatically when setting target_speed
+ or manually by fan[1-12]_div.
+ pwm_rate_of_change: NOT set by the driver.
+ fan_window: NOT set by the driver.
+
+The last two values are not set by the driver, because there's no generic way to
+compute them. You should set them manually through i2c (in the bootloader for
+example). Check the datasheet for details.
+
+The fan fault value latches, to reset it, set a value to pwm[1-6]
+or fan[1-6]_target.
+
+About fan[1-12]_div
+-------------------
+This value affects the measurable range of the chip. The driver sets this value
+automatically in RPM based on fan[1-6]_target. In PWM mode, you should set this
+value manually based on the details from the datasheet. Setting the speed range
+is disabled while in RPM mode to prevent overwriting the automatically
+calculated value.
Sysfs entries
-------------
@@ -39,7 +77,8 @@ fan[1-12]_enable RW enable fan speed monitoring
fan[1-12]_input RO fan tachometer speed in RPM
fan[1-12]_fault RO fan experienced fault
fan[1-12]_div RW set the measurable speed range, not available in RPM mode
-fan[1-6]_target RW desired fan speed in RPM
+fan[1-6]_target RW RPM mode = desired fan speed
+ PWM mode = minimum fan speed until fault
pwm[1-6]_enable RW regulator mode, 0=full speed, 1=manual (pwm) mode, 2=rpm mode
setting rpm mode sets fan*_enable to 1
pwm[1-6] RW fan target duty cycle (0-255)
--
2.31.1
^ permalink raw reply related [flat|nested] 18+ messages in thread
* Re: [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap
2021-04-13 2:59 [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap Václav Kubernát
` (3 preceding siblings ...)
2021-04-13 2:59 ` [PATCH v2 5/5] hwmon: (max31790) Update documentation Václav Kubernát
@ 2021-04-13 3:10 ` Václav Kubernát
2021-04-22 1:27 ` Guenter Roeck
2021-04-26 12:37 ` [PATCH v4 " Václav Kubernát
6 siblings, 0 replies; 18+ messages in thread
From: Václav Kubernát @ 2021-04-13 3:10 UTC (permalink / raw)
Cc: Jean Delvare, Guenter Roeck, Jonathan Corbet, linux-hwmon,
linux-doc, linux-kernel
Hello,
I'm uploading a new version of my patches on max31790. This is a "v3"
patch, but I have mistakenly tagged it as "v2". Hopefully, this is not
a big issue.
Changes:
- I have reintroduced locking. However, I'm not sure if it's enough, I
think, locking needs to happen even when reading, but I'm not sure
- fan_config and fan_dynamics are now saved locally
- I have fixed formatting issues
Václav
út 13. 4. 2021 v 5:02 odesílatel Václav Kubernát <kubernat@cesnet.cz> napsal:
>
> Converting the driver to use regmap makes it more generic. It also makes
> it a lot easier to debug through debugfs.
>
> Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
> ---
> drivers/hwmon/Kconfig | 1 +
> drivers/hwmon/max31790.c | 254 ++++++++++++++++++++-------------------
> 2 files changed, 133 insertions(+), 122 deletions(-)
>
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 1ecf697d8d99..9f11d036c316 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1095,6 +1095,7 @@ config SENSORS_MAX6697
> config SENSORS_MAX31790
> tristate "Maxim MAX31790 sensor chip"
> depends on I2C
> + select REGMAP_I2C
> help
> If you say yes here you get support for 6-Channel PWM-Output
> Fan RPM Controller.
> diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
> index 2c6b333a28e9..e3765ce4444a 100644
> --- a/drivers/hwmon/max31790.c
> +++ b/drivers/hwmon/max31790.c
> @@ -12,6 +12,7 @@
> #include <linux/init.h>
> #include <linux/jiffies.h>
> #include <linux/module.h>
> +#include <linux/regmap.h>
> #include <linux/slab.h>
>
> /* MAX31790 registers */
> @@ -46,92 +47,53 @@
>
> #define NR_CHANNEL 6
>
> +#define MAX31790_REG_USER_BYTE_67 0x67
> +
> +#define BULK_TO_U16(msb, lsb) (((msb) << 8) + (lsb))
> +#define U16_MSB(num) (((num) & 0xFF00) >> 8)
> +#define U16_LSB(num) ((num) & 0x00FF)
> +
> +static const struct regmap_range max31790_ro_range = {
> + .range_min = MAX31790_REG_TACH_COUNT(0),
> + .range_max = MAX31790_REG_PWMOUT(0) - 1,
> +};
> +
> +static const struct regmap_access_table max31790_wr_table = {
> + .no_ranges = &max31790_ro_range,
> + .n_no_ranges = 1,
> +};
> +
> +static const struct regmap_range max31790_volatile_ranges[] = {
> + regmap_reg_range(MAX31790_REG_TACH_COUNT(0), MAX31790_REG_TACH_COUNT(12)),
> + regmap_reg_range(MAX31790_REG_FAN_FAULT_STATUS2, MAX31790_REG_FAN_FAULT_STATUS1),
> +};
> +
> +static const struct regmap_access_table max31790_volatile_table = {
> + .no_ranges = max31790_volatile_ranges,
> + .n_no_ranges = 2,
> + .n_yes_ranges = 0
> +};
> +
> +static const struct regmap_config max31790_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .reg_stride = 1,
> + .max_register = MAX31790_REG_USER_BYTE_67,
> + .wr_table = &max31790_wr_table,
> + .volatile_table = &max31790_volatile_table
> +};
> +
> /*
> * Client data (each client gets its own)
> */
> struct max31790_data {
> - struct i2c_client *client;
> + struct regmap *regmap;
> +
> struct mutex update_lock;
> - bool valid; /* zero until following fields are valid */
> - unsigned long last_updated; /* in jiffies */
> -
> - /* register values */
> u8 fan_config[NR_CHANNEL];
> u8 fan_dynamics[NR_CHANNEL];
> - u16 fault_status;
> - u16 tach[NR_CHANNEL * 2];
> - u16 pwm[NR_CHANNEL];
> - u16 target_count[NR_CHANNEL];
> };
>
> -static struct max31790_data *max31790_update_device(struct device *dev)
> -{
> - struct max31790_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> - struct max31790_data *ret = data;
> - int i;
> - int rv;
> -
> - mutex_lock(&data->update_lock);
> -
> - if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
> - rv = i2c_smbus_read_byte_data(client,
> - MAX31790_REG_FAN_FAULT_STATUS1);
> - if (rv < 0)
> - goto abort;
> - data->fault_status = rv & 0x3F;
> -
> - rv = i2c_smbus_read_byte_data(client,
> - MAX31790_REG_FAN_FAULT_STATUS2);
> - if (rv < 0)
> - goto abort;
> - data->fault_status |= (rv & 0x3F) << 6;
> -
> - for (i = 0; i < NR_CHANNEL; i++) {
> - rv = i2c_smbus_read_word_swapped(client,
> - MAX31790_REG_TACH_COUNT(i));
> - if (rv < 0)
> - goto abort;
> - data->tach[i] = rv;
> -
> - if (data->fan_config[i]
> - & MAX31790_FAN_CFG_TACH_INPUT) {
> - rv = i2c_smbus_read_word_swapped(client,
> - MAX31790_REG_TACH_COUNT(NR_CHANNEL
> - + i));
> - if (rv < 0)
> - goto abort;
> - data->tach[NR_CHANNEL + i] = rv;
> - } else {
> - rv = i2c_smbus_read_word_swapped(client,
> - MAX31790_REG_PWMOUT(i));
> - if (rv < 0)
> - goto abort;
> - data->pwm[i] = rv;
> -
> - rv = i2c_smbus_read_word_swapped(client,
> - MAX31790_REG_TARGET_COUNT(i));
> - if (rv < 0)
> - goto abort;
> - data->target_count[i] = rv;
> - }
> - }
> -
> - data->last_updated = jiffies;
> - data->valid = true;
> - }
> - goto done;
> -
> -abort:
> - data->valid = false;
> - ret = ERR_PTR(rv);
> -
> -done:
> - mutex_unlock(&data->update_lock);
> -
> - return ret;
> -}
> -
> static const u8 tach_period[8] = { 1, 2, 4, 8, 16, 32, 32, 32 };
>
> static u8 get_tach_period(u8 fan_dynamics)
> @@ -159,28 +121,75 @@ static u8 bits_for_tach_period(int rpm)
> return bits;
> }
>
> +static int read_reg_byte(struct regmap *regmap, u8 reg)
> +{
> + int rv;
> + int val;
> +
> + rv = regmap_read(regmap, reg, &val);
> + if (rv < 0)
> + return rv;
> +
> + return val;
> +}
> +
> +static int read_reg_word(struct regmap *regmap, u8 reg)
> +{
> + int rv;
> + u8 val_bulk[2];
> +
> + rv = regmap_bulk_read(regmap, reg, val_bulk, 2);
> + if (rv < 0)
> + return rv;
> +
> + return BULK_TO_U16(val_bulk[0], val_bulk[1]);
> +}
> +
> +static int write_reg_word(struct regmap *regmap, u8 reg, u16 val)
> +{
> + u8 bulk_val[2];
> +
> + bulk_val[0] = U16_MSB(val);
> + bulk_val[1] = U16_LSB(val);
> +
> + return regmap_bulk_write(regmap, reg, bulk_val, 2);
> +}
> +
> static int max31790_read_fan(struct device *dev, u32 attr, int channel,
> long *val)
> {
> - struct max31790_data *data = max31790_update_device(dev);
> - int sr, rpm;
> -
> - if (IS_ERR(data))
> - return PTR_ERR(data);
> + struct max31790_data *data = dev_get_drvdata(dev);
> + struct regmap *regmap = data->regmap;
> + int tach, fault;
>
> switch (attr) {
> case hwmon_fan_input:
> - sr = get_tach_period(data->fan_dynamics[channel]);
> - rpm = RPM_FROM_REG(data->tach[channel], sr);
> - *val = rpm;
> + tach = read_reg_word(regmap, MAX31790_REG_TACH_COUNT(channel));
> + if (tach < 0)
> + return tach;
> +
> + *val = RPM_FROM_REG(tach, get_tach_period(data->fan_dynamics[channel]));
> return 0;
> case hwmon_fan_target:
> - sr = get_tach_period(data->fan_dynamics[channel]);
> - rpm = RPM_FROM_REG(data->target_count[channel], sr);
> - *val = rpm;
> + tach = read_reg_word(regmap, MAX31790_REG_TARGET_COUNT(channel));
> + if (tach < 0)
> + return tach;
> +
> + *val = RPM_FROM_REG(tach, get_tach_period(data->fan_dynamics[channel]));
> return 0;
> case hwmon_fan_fault:
> - *val = !!(data->fault_status & (1 << channel));
> + if (channel > 6)
> + fault = read_reg_byte(regmap, MAX31790_REG_FAN_FAULT_STATUS2);
> + else
> + fault = read_reg_byte(regmap, MAX31790_REG_FAN_FAULT_STATUS1);
> +
> + if (fault < 0)
> + return fault;
> +
> + if (channel > 6)
> + *val = !!(fault & (1 << (channel - 6)));
> + else
> + *val = !!(fault & (1 << channel));
> return 0;
> default:
> return -EOPNOTSUPP;
> @@ -191,7 +200,7 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
> long val)
> {
> struct max31790_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> + struct regmap *regmap = data->regmap;
> int target_count;
> int err = 0;
> u8 bits;
> @@ -207,9 +216,10 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
> ((data->fan_dynamics[channel] &
> ~MAX31790_FAN_DYN_SR_MASK) |
> (bits << MAX31790_FAN_DYN_SR_SHIFT));
> - err = i2c_smbus_write_byte_data(client,
> - MAX31790_REG_FAN_DYNAMICS(channel),
> - data->fan_dynamics[channel]);
> +
> + err = regmap_write(regmap,
> + MAX31790_REG_FAN_DYNAMICS(channel),
> + data->fan_dynamics[channel]);
> if (err < 0)
> break;
>
> @@ -217,11 +227,11 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
> target_count = RPM_TO_REG(val, sr);
> target_count = clamp_val(target_count, 0x1, 0x7FF);
>
> - data->target_count[channel] = target_count << 5;
> + target_count = target_count << 5;
>
> - err = i2c_smbus_write_word_swapped(client,
> - MAX31790_REG_TARGET_COUNT(channel),
> - data->target_count[channel]);
> + err = write_reg_word(regmap,
> + MAX31790_REG_TARGET_COUNT(channel),
> + target_count);
> break;
> default:
> err = -EOPNOTSUPP;
> @@ -258,22 +268,22 @@ static umode_t max31790_fan_is_visible(const void *_data, u32 attr, int channel)
> static int max31790_read_pwm(struct device *dev, u32 attr, int channel,
> long *val)
> {
> - struct max31790_data *data = max31790_update_device(dev);
> - u8 fan_config;
> -
> - if (IS_ERR(data))
> - return PTR_ERR(data);
> -
> - fan_config = data->fan_config[channel];
> + struct max31790_data *data = dev_get_drvdata(dev);
> + struct regmap *regmap = data->regmap;
> + int read;
>
> switch (attr) {
> case hwmon_pwm_input:
> - *val = data->pwm[channel] >> 8;
> + read = read_reg_word(regmap, MAX31790_REG_PWMOUT(channel));
> + if (read < 0)
> + return read;
> +
> + *val = read >> 8;
> return 0;
> case hwmon_pwm_enable:
> - if (fan_config & MAX31790_FAN_CFG_RPM_MODE)
> + if (data->fan_config[channel] & MAX31790_FAN_CFG_RPM_MODE)
> *val = 2;
> - else if (fan_config & MAX31790_FAN_CFG_TACH_INPUT_EN)
> + else if (data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN)
> *val = 1;
> else
> *val = 0;
> @@ -287,7 +297,7 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
> long val)
> {
> struct max31790_data *data = dev_get_drvdata(dev);
> - struct i2c_client *client = data->client;
> + struct regmap *regmap = data->regmap;
> u8 fan_config;
> int err = 0;
>
> @@ -299,10 +309,7 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
> err = -EINVAL;
> break;
> }
> - data->pwm[channel] = val << 8;
> - err = i2c_smbus_write_word_swapped(client,
> - MAX31790_REG_PWMOUT(channel),
> - data->pwm[channel]);
> + err = write_reg_word(regmap, MAX31790_REG_PWMOUT(channel), val << 8);
> break;
> case hwmon_pwm_enable:
> fan_config = data->fan_config[channel];
> @@ -321,9 +328,9 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
> break;
> }
> data->fan_config[channel] = fan_config;
> - err = i2c_smbus_write_byte_data(client,
> - MAX31790_REG_FAN_CONFIG(channel),
> - fan_config);
> + err = regmap_write(regmap,
> + MAX31790_REG_FAN_CONFIG(channel),
> + fan_config);
> break;
> default:
> err = -EOPNOTSUPP;
> @@ -426,20 +433,18 @@ static const struct hwmon_chip_info max31790_chip_info = {
> .info = max31790_info,
> };
>
> -static int max31790_init_client(struct i2c_client *client,
> +static int max31790_init_client(struct regmap *regmap,
> struct max31790_data *data)
> {
> int i, rv;
>
> for (i = 0; i < NR_CHANNEL; i++) {
> - rv = i2c_smbus_read_byte_data(client,
> - MAX31790_REG_FAN_CONFIG(i));
> + rv = read_reg_byte(regmap, MAX31790_REG_FAN_CONFIG(i % NR_CHANNEL));
> if (rv < 0)
> return rv;
> data->fan_config[i] = rv;
>
> - rv = i2c_smbus_read_byte_data(client,
> - MAX31790_REG_FAN_DYNAMICS(i));
> + rv = read_reg_byte(regmap, MAX31790_REG_FAN_DYNAMICS(i));
> if (rv < 0)
> return rv;
> data->fan_dynamics[i] = rv;
> @@ -464,13 +469,18 @@ static int max31790_probe(struct i2c_client *client)
> if (!data)
> return -ENOMEM;
>
> - data->client = client;
> mutex_init(&data->update_lock);
>
> + data->regmap = devm_regmap_init_i2c(client, &max31790_regmap_config);
> + if (IS_ERR(data->regmap)) {
> + dev_err(dev, "failed to allocate register map\n");
> + return PTR_ERR(data->regmap);
> + }
> +
> /*
> * Initialize the max31790 chip
> */
> - err = max31790_init_client(client, data);
> + err = max31790_init_client(data->regmap, data);
> if (err)
> return err;
>
> --
> 2.31.1
>
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v2 2/5] hwmon: (max31790) Fix and split pwm*_enable
[not found] ` <20210419223340.GA229491@roeck-us.net>
@ 2021-04-22 0:26 ` Václav Kubernát
0 siblings, 0 replies; 18+ messages in thread
From: Václav Kubernát @ 2021-04-22 0:26 UTC (permalink / raw)
To: Guenter Roeck
Cc: Jean Delvare, Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
Okay, no problem, I'll get rid of the full-speed mode (and update the
documentation) in the next version of the patch. Do you think I should
disable the value "0" in pwm*_enable?
Václav
út 20. 4. 2021 v 0:33 odesílatel Guenter Roeck <linux@roeck-us.net> napsal:
>
> On Tue, Apr 13, 2021 at 04:59:45AM +0200, Václav Kubernát wrote:
> > In the old code, pwm*_enable does two things. Firstly, it sets whether
> > the chip should run in PWM or RPM mode. Secondly, it tells the chip
> > whether it should monitor fan RPM. However, these two settings aren't
> > tied together, so they shouldn't be set with a single value. In the new
> > code, fan*_enable now controls fan RPM monitoring (pwm*_enable no longer
> > controls that).
> >
> > According to the sysfs hwmon documentation, pwm*_enable has three
> > possible values, 0 for "no control / full-speed", 1 for manual mode, and
> > 2+ for automatic. The old code works fine for 1 and 2, but 0 only
> > differs from 1 in that it just turns off fan speed monitoring. The chip
> > actually does have a way to turn off fan controls (and only monitor),
> > but what that does is that it sets PWM to 0% duty cycle (which is the
> > opposite to full-speed) AND it also turns off fan speed monitoring.
> > Because of this, I implemented the 0 value by setting PWM mode to 100%.
> > This method does come with a problem: it is impossible to differentiate
> > between full-speed and PWM mode just from the values on the chip. The
> > new code solves this by saving a value indicating whether we're in
> > full-speed mode. This value is initialized to 0, so full-speed mode
> > won't persist across reboots.
> >
> I don't think this is a good idea, sorry. It is not just a problem across
> reboots, but also when unloading and reloading the driver. I think we
> should stick with chip capabilities and adjust the documentation
> accordingly.
>
> Guenter
>
> > These two changes are closely connected together, mainly because the
> > detection of the pwm*_enable value depended on whether fan speed
> > monitoring is enabled (which is now controlled as written in the first
> > paragraph).
> >
> > Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
> > ---
> > Documentation/hwmon/max31790.rst | 8 +--
> > drivers/hwmon/max31790.c | 87 ++++++++++++++++++++++----------
> > 2 files changed, 66 insertions(+), 29 deletions(-)
> >
> > diff --git a/Documentation/hwmon/max31790.rst b/Documentation/hwmon/max31790.rst
> > index f301385d8cef..8979c8a02cd1 100644
> > --- a/Documentation/hwmon/max31790.rst
> > +++ b/Documentation/hwmon/max31790.rst
> > @@ -34,10 +34,12 @@ also be configured to serve as tachometer inputs.
> > Sysfs entries
> > -------------
> >
> > -================== === =======================================================
> > +================== === =============================================================
> > +fan[1-12]_enable RW enable fan speed monitoring
> > fan[1-12]_input RO fan tachometer speed in RPM
> > fan[1-12]_fault RO fan experienced fault
> > fan[1-6]_target RW desired fan speed in RPM
> > -pwm[1-6]_enable RW regulator mode, 0=disabled, 1=manual mode, 2=rpm mode
> > +pwm[1-6]_enable RW regulator mode, 0=full speed, 1=manual (pwm) mode, 2=rpm mode
> > + setting rpm mode sets fan*_enable to 1
> > pwm[1-6] RW fan target duty cycle (0-255)
> > -================== === =======================================================
> > +================== === =============================================================
> > diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
> > index e3765ce4444a..ecdd55e12ffe 100644
> > --- a/drivers/hwmon/max31790.c
> > +++ b/drivers/hwmon/max31790.c
> > @@ -39,6 +39,7 @@
> >
> > #define FAN_RPM_MIN 120
> > #define FAN_RPM_MAX 7864320
> > +#define MAX_PWM 0XFF80
> >
> > #define RPM_FROM_REG(reg, sr) (((reg) >> 4) ? \
> > ((60 * (sr) * 8192) / ((reg) >> 4)) : \
> > @@ -90,6 +91,7 @@ struct max31790_data {
> > struct regmap *regmap;
> >
> > struct mutex update_lock;
> > + bool full_speed[NR_CHANNEL];
> > u8 fan_config[NR_CHANNEL];
> > u8 fan_dynamics[NR_CHANNEL];
> > };
> > @@ -191,6 +193,9 @@ static int max31790_read_fan(struct device *dev, u32 attr, int channel,
> > else
> > *val = !!(fault & (1 << channel));
> > return 0;
> > + case hwmon_fan_enable:
> > + *val = !!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN);
> > + return 0;
> > default:
> > return -EOPNOTSUPP;
> > }
> > @@ -233,6 +238,15 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
> > MAX31790_REG_TARGET_COUNT(channel),
> > target_count);
> > break;
> > + case hwmon_fan_enable:
> > + if (val == 0)
> > + data->fan_config[channel] &= ~MAX31790_FAN_CFG_TACH_INPUT_EN;
> > + else
> > + data->fan_config[channel] |= MAX31790_FAN_CFG_TACH_INPUT_EN;
> > + err = regmap_write(regmap,
> > + MAX31790_REG_FAN_CONFIG(channel),
> > + data->fan_config[channel]);
> > + break;
> > default:
> > err = -EOPNOTSUPP;
> > break;
> > @@ -260,6 +274,11 @@ static umode_t max31790_fan_is_visible(const void *_data, u32 attr, int channel)
> > !(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
> > return 0644;
> > return 0;
> > + case hwmon_fan_enable:
> > + if (channel < NR_CHANNEL ||
> > + (fan_config & MAX31790_FAN_CFG_TACH_INPUT))
> > + return 0644;
> > + return 0;
> > default:
> > return 0;
> > }
> > @@ -281,12 +300,12 @@ static int max31790_read_pwm(struct device *dev, u32 attr, int channel,
> > *val = read >> 8;
> > return 0;
> > case hwmon_pwm_enable:
> > - if (data->fan_config[channel] & MAX31790_FAN_CFG_RPM_MODE)
> > + if (data->full_speed[channel])
> > + *val = 0;
> > + else if (data->fan_config[channel] & MAX31790_FAN_CFG_RPM_MODE)
> > *val = 2;
> > - else if (data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN)
> > + else
> > *val = 1;
> > - else
> > - *val = 0;
> > return 0;
> > default:
> > return -EOPNOTSUPP;
> > @@ -305,28 +324,42 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
> >
> > switch (attr) {
> > case hwmon_pwm_input:
> > - if (val < 0 || val > 255) {
> > + if (data->full_speed[channel] || val < 0 || val > 255) {
> > err = -EINVAL;
> > break;
> > }
> > +
> > err = write_reg_word(regmap, MAX31790_REG_PWMOUT(channel), val << 8);
> > break;
> > case hwmon_pwm_enable:
> > fan_config = data->fan_config[channel];
> > - if (val == 0) {
> > - fan_config &= ~(MAX31790_FAN_CFG_TACH_INPUT_EN |
> > - MAX31790_FAN_CFG_RPM_MODE);
> > - } else if (val == 1) {
> > - fan_config = (fan_config |
> > - MAX31790_FAN_CFG_TACH_INPUT_EN) &
> > - ~MAX31790_FAN_CFG_RPM_MODE;
> > + if (val == 0 || val == 1) {
> > + fan_config &= ~MAX31790_FAN_CFG_RPM_MODE;
> > } else if (val == 2) {
> > - fan_config |= MAX31790_FAN_CFG_TACH_INPUT_EN |
> > - MAX31790_FAN_CFG_RPM_MODE;
> > + fan_config |= MAX31790_FAN_CFG_RPM_MODE;
> > } else {
> > err = -EINVAL;
> > break;
> > }
> > +
> > + /*
> > + * The chip sets PWM to zero when using its "monitor only" mode
> > + * and 0 means full speed.
> > + */
> > + if (val == 0) {
> > + data->full_speed[channel] = true;
> > + err = write_reg_word(regmap, MAX31790_REG_PWMOUT(channel), MAX_PWM);
> > + } else {
> > + data->full_speed[channel] = false;
> > + }
> > +
> > + /*
> > + * RPM mode implies enabled TACH input, so enable it in RPM
> > + * mode.
> > + */
> > + if (val == 2)
> > + fan_config |= MAX31790_FAN_CFG_TACH_INPUT_EN;
> > +
> > data->fan_config[channel] = fan_config;
> > err = regmap_write(regmap,
> > MAX31790_REG_FAN_CONFIG(channel),
> > @@ -400,18 +433,18 @@ static umode_t max31790_is_visible(const void *data,
> >
> > static const struct hwmon_channel_info *max31790_info[] = {
> > HWMON_CHANNEL_INFO(fan,
> > - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
> > - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
> > - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
> > - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
> > - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
> > - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
> > - HWMON_F_INPUT | HWMON_F_FAULT,
> > - HWMON_F_INPUT | HWMON_F_FAULT,
> > - HWMON_F_INPUT | HWMON_F_FAULT,
> > - HWMON_F_INPUT | HWMON_F_FAULT,
> > - HWMON_F_INPUT | HWMON_F_FAULT,
> > - HWMON_F_INPUT | HWMON_F_FAULT),
> > + HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
> > + HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
> > + HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
> > + HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
> > + HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
> > + HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
> > + HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
> > + HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
> > + HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
> > + HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
> > + HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
> > + HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT),
> > HWMON_CHANNEL_INFO(pwm,
> > HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
> > HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
> > @@ -448,6 +481,8 @@ static int max31790_init_client(struct regmap *regmap,
> > if (rv < 0)
> > return rv;
> > data->fan_dynamics[i] = rv;
> > +
> > + data->full_speed[i] = false;
> > }
> >
> > return 0;
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap
2021-04-13 2:59 [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap Václav Kubernát
` (4 preceding siblings ...)
2021-04-13 3:10 ` [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap Václav Kubernát
@ 2021-04-22 1:27 ` Guenter Roeck
2021-04-23 10:55 ` Václav Kubernát
2021-04-26 12:46 ` Václav Kubernát
2021-04-26 12:37 ` [PATCH v4 " Václav Kubernát
6 siblings, 2 replies; 18+ messages in thread
From: Guenter Roeck @ 2021-04-22 1:27 UTC (permalink / raw)
To: Václav Kubernát
Cc: Jean Delvare, Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
On 4/12/21 7:59 PM, Václav Kubernát wrote:
> Converting the driver to use regmap makes it more generic. It also makes
> it a lot easier to debug through debugfs.
>
> Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
> ---
> drivers/hwmon/Kconfig | 1 +
> drivers/hwmon/max31790.c | 254 ++++++++++++++++++++-------------------
> 2 files changed, 133 insertions(+), 122 deletions(-)
>
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 1ecf697d8d99..9f11d036c316 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1095,6 +1095,7 @@ config SENSORS_MAX6697
> config SENSORS_MAX31790
> tristate "Maxim MAX31790 sensor chip"
> depends on I2C
> + select REGMAP_I2C
> help
> If you say yes here you get support for 6-Channel PWM-Output
> Fan RPM Controller.
> diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
> index 2c6b333a28e9..e3765ce4444a 100644
> --- a/drivers/hwmon/max31790.c
> +++ b/drivers/hwmon/max31790.c
> @@ -12,6 +12,7 @@
> #include <linux/init.h>
> #include <linux/jiffies.h>
> #include <linux/module.h>
> +#include <linux/regmap.h>
> #include <linux/slab.h>
>
> /* MAX31790 registers */
> @@ -46,92 +47,53 @@
>
> #define NR_CHANNEL 6
>
> +#define MAX31790_REG_USER_BYTE_67 0x67
> +
> +#define BULK_TO_U16(msb, lsb) (((msb) << 8) + (lsb))
> +#define U16_MSB(num) (((num) & 0xFF00) >> 8)
> +#define U16_LSB(num) ((num) & 0x00FF)
> +
> +static const struct regmap_range max31790_ro_range = {
> + .range_min = MAX31790_REG_TACH_COUNT(0),
> + .range_max = MAX31790_REG_PWMOUT(0) - 1,
> +};
> +
> +static const struct regmap_access_table max31790_wr_table = {
> + .no_ranges = &max31790_ro_range,
> + .n_no_ranges = 1,
> +};
> +
> +static const struct regmap_range max31790_volatile_ranges[] = {
> + regmap_reg_range(MAX31790_REG_TACH_COUNT(0), MAX31790_REG_TACH_COUNT(12)),
> + regmap_reg_range(MAX31790_REG_FAN_FAULT_STATUS2, MAX31790_REG_FAN_FAULT_STATUS1),
> +};
> +
> +static const struct regmap_access_table max31790_volatile_table = {
> + .no_ranges = max31790_volatile_ranges,
> + .n_no_ranges = 2,
> + .n_yes_ranges = 0
> +};
Looks like my reply to this got lost. Other regmap code suggests that
volatile register ranges are identified with yes_ranges, not with no_ranges.
"no" seems to mean "not volatile". Please verify and confirm if the
above code does what you want it to do.
Thanks,
Guenter
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap
2021-04-22 1:27 ` Guenter Roeck
@ 2021-04-23 10:55 ` Václav Kubernát
2021-04-26 12:46 ` Václav Kubernát
1 sibling, 0 replies; 18+ messages in thread
From: Václav Kubernát @ 2021-04-23 10:55 UTC (permalink / raw)
To: Guenter Roeck
Cc: Jean Delvare, Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
Hello.
I agree that it makes sense to swap yes_ranges and no_ranges. I tested
that, but it seems like it doesn't have an effect, I could still see
fan*_input changing (that's where I don't want caching). Does caching
work automatically? As in, all registers are cached by default in
regmap, and only registers that are in the volatile yes_ranges aren't?
Václav
čt 22. 4. 2021 v 3:31 odesílatel Guenter Roeck <linux@roeck-us.net> napsal:
>
> On 4/12/21 7:59 PM, Václav Kubernát wrote:
> > Converting the driver to use regmap makes it more generic. It also makes
> > it a lot easier to debug through debugfs.
> >
> > Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
> > ---
> > drivers/hwmon/Kconfig | 1 +
> > drivers/hwmon/max31790.c | 254 ++++++++++++++++++++-------------------
> > 2 files changed, 133 insertions(+), 122 deletions(-)
> >
> > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> > index 1ecf697d8d99..9f11d036c316 100644
> > --- a/drivers/hwmon/Kconfig
> > +++ b/drivers/hwmon/Kconfig
> > @@ -1095,6 +1095,7 @@ config SENSORS_MAX6697
> > config SENSORS_MAX31790
> > tristate "Maxim MAX31790 sensor chip"
> > depends on I2C
> > + select REGMAP_I2C
> > help
> > If you say yes here you get support for 6-Channel PWM-Output
> > Fan RPM Controller.
> > diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
> > index 2c6b333a28e9..e3765ce4444a 100644
> > --- a/drivers/hwmon/max31790.c
> > +++ b/drivers/hwmon/max31790.c
> > @@ -12,6 +12,7 @@
> > #include <linux/init.h>
> > #include <linux/jiffies.h>
> > #include <linux/module.h>
> > +#include <linux/regmap.h>
> > #include <linux/slab.h>
> >
> > /* MAX31790 registers */
> > @@ -46,92 +47,53 @@
> >
> > #define NR_CHANNEL 6
> >
> > +#define MAX31790_REG_USER_BYTE_67 0x67
> > +
> > +#define BULK_TO_U16(msb, lsb) (((msb) << 8) + (lsb))
> > +#define U16_MSB(num) (((num) & 0xFF00) >> 8)
> > +#define U16_LSB(num) ((num) & 0x00FF)
> > +
> > +static const struct regmap_range max31790_ro_range = {
> > + .range_min = MAX31790_REG_TACH_COUNT(0),
> > + .range_max = MAX31790_REG_PWMOUT(0) - 1,
> > +};
> > +
> > +static const struct regmap_access_table max31790_wr_table = {
> > + .no_ranges = &max31790_ro_range,
> > + .n_no_ranges = 1,
> > +};
> > +
> > +static const struct regmap_range max31790_volatile_ranges[] = {
> > + regmap_reg_range(MAX31790_REG_TACH_COUNT(0), MAX31790_REG_TACH_COUNT(12)),
> > + regmap_reg_range(MAX31790_REG_FAN_FAULT_STATUS2, MAX31790_REG_FAN_FAULT_STATUS1),
> > +};
> > +
> > +static const struct regmap_access_table max31790_volatile_table = {
> > + .no_ranges = max31790_volatile_ranges,
> > + .n_no_ranges = 2,
> > + .n_yes_ranges = 0
> > +};
>
> Looks like my reply to this got lost. Other regmap code suggests that
> volatile register ranges are identified with yes_ranges, not with no_ranges.
> "no" seems to mean "not volatile". Please verify and confirm if the
> above code does what you want it to do.
>
> Thanks,
> Guenter
^ permalink raw reply [flat|nested] 18+ messages in thread
* [PATCH v4 1/5] hwmon: (max31790) Rework to use regmap
2021-04-13 2:59 [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap Václav Kubernát
` (5 preceding siblings ...)
2021-04-22 1:27 ` Guenter Roeck
@ 2021-04-26 12:37 ` Václav Kubernát
2021-04-26 12:37 ` [PATCH v4 2/5] hwmon: (max31790) Fix and split pwm*_enable Václav Kubernát
` (3 more replies)
6 siblings, 4 replies; 18+ messages in thread
From: Václav Kubernát @ 2021-04-26 12:37 UTC (permalink / raw)
Cc: Václav Kubernát, Jean Delvare, Guenter Roeck,
Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
Converting the driver to use regmap makes it more generic. It also makes
it a lot easier to debug through debugfs.
Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
---
drivers/hwmon/Kconfig | 1 +
drivers/hwmon/max31790.c | 255 ++++++++++++++++++++-------------------
2 files changed, 134 insertions(+), 122 deletions(-)
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 1ecf697d8d99..9f11d036c316 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1095,6 +1095,7 @@ config SENSORS_MAX6697
config SENSORS_MAX31790
tristate "Maxim MAX31790 sensor chip"
depends on I2C
+ select REGMAP_I2C
help
If you say yes here you get support for 6-Channel PWM-Output
Fan RPM Controller.
diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index 86e6c71db685..8b90fcc685f5 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -12,6 +12,7 @@
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/module.h>
+#include <linux/regmap.h>
#include <linux/slab.h>
/* MAX31790 registers */
@@ -46,92 +47,54 @@
#define NR_CHANNEL 6
+#define MAX31790_REG_USER_BYTE_67 0x67
+
+#define BULK_TO_U16(msb, lsb) (((msb) << 8) + (lsb))
+#define U16_MSB(num) (((num) & 0xFF00) >> 8)
+#define U16_LSB(num) ((num) & 0x00FF)
+
+static const struct regmap_range max31790_ro_range = {
+ .range_min = MAX31790_REG_TACH_COUNT(0),
+ .range_max = MAX31790_REG_PWMOUT(0) - 1,
+};
+
+static const struct regmap_access_table max31790_wr_table = {
+ .no_ranges = &max31790_ro_range,
+ .n_no_ranges = 1,
+};
+
+static const struct regmap_range max31790_volatile_ranges[] = {
+ regmap_reg_range(MAX31790_REG_TACH_COUNT(0), MAX31790_REG_TACH_COUNT(12)),
+ regmap_reg_range(MAX31790_REG_FAN_FAULT_STATUS2, MAX31790_REG_FAN_FAULT_STATUS1),
+};
+
+static const struct regmap_access_table max31790_volatile_table = {
+ .yes_ranges = max31790_volatile_ranges,
+ .n_no_ranges = 0,
+ .n_yes_ranges = 2
+};
+
+static const struct regmap_config max31790_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .reg_stride = 1,
+ .max_register = MAX31790_REG_USER_BYTE_67,
+ .wr_table = &max31790_wr_table,
+ .volatile_table = &max31790_volatile_table,
+ .cache_type = REGCACHE_RBTREE
+};
+
/*
* Client data (each client gets its own)
*/
struct max31790_data {
- struct i2c_client *client;
+ struct regmap *regmap;
+
struct mutex update_lock;
- bool valid; /* zero until following fields are valid */
- unsigned long last_updated; /* in jiffies */
-
- /* register values */
u8 fan_config[NR_CHANNEL];
u8 fan_dynamics[NR_CHANNEL];
- u16 fault_status;
- u16 tach[NR_CHANNEL * 2];
- u16 pwm[NR_CHANNEL];
- u16 target_count[NR_CHANNEL];
};
-static struct max31790_data *max31790_update_device(struct device *dev)
-{
- struct max31790_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- struct max31790_data *ret = data;
- int i;
- int rv;
-
- mutex_lock(&data->update_lock);
-
- if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
- rv = i2c_smbus_read_byte_data(client,
- MAX31790_REG_FAN_FAULT_STATUS1);
- if (rv < 0)
- goto abort;
- data->fault_status = rv & 0x3F;
-
- rv = i2c_smbus_read_byte_data(client,
- MAX31790_REG_FAN_FAULT_STATUS2);
- if (rv < 0)
- goto abort;
- data->fault_status |= (rv & 0x3F) << 6;
-
- for (i = 0; i < NR_CHANNEL; i++) {
- rv = i2c_smbus_read_word_swapped(client,
- MAX31790_REG_TACH_COUNT(i));
- if (rv < 0)
- goto abort;
- data->tach[i] = rv;
-
- if (data->fan_config[i]
- & MAX31790_FAN_CFG_TACH_INPUT) {
- rv = i2c_smbus_read_word_swapped(client,
- MAX31790_REG_TACH_COUNT(NR_CHANNEL
- + i));
- if (rv < 0)
- goto abort;
- data->tach[NR_CHANNEL + i] = rv;
- } else {
- rv = i2c_smbus_read_word_swapped(client,
- MAX31790_REG_PWMOUT(i));
- if (rv < 0)
- goto abort;
- data->pwm[i] = rv;
-
- rv = i2c_smbus_read_word_swapped(client,
- MAX31790_REG_TARGET_COUNT(i));
- if (rv < 0)
- goto abort;
- data->target_count[i] = rv;
- }
- }
-
- data->last_updated = jiffies;
- data->valid = true;
- }
- goto done;
-
-abort:
- data->valid = false;
- ret = ERR_PTR(rv);
-
-done:
- mutex_unlock(&data->update_lock);
-
- return ret;
-}
-
static const u8 tach_period[8] = { 1, 2, 4, 8, 16, 32, 32, 32 };
static u8 get_tach_period(u8 fan_dynamics)
@@ -159,28 +122,75 @@ static u8 bits_for_tach_period(int rpm)
return bits;
}
+static int read_reg_byte(struct regmap *regmap, u8 reg)
+{
+ int rv;
+ int val;
+
+ rv = regmap_read(regmap, reg, &val);
+ if (rv < 0)
+ return rv;
+
+ return val;
+}
+
+static int read_reg_word(struct regmap *regmap, u8 reg)
+{
+ int rv;
+ u8 val_bulk[2];
+
+ rv = regmap_bulk_read(regmap, reg, val_bulk, 2);
+ if (rv < 0)
+ return rv;
+
+ return BULK_TO_U16(val_bulk[0], val_bulk[1]);
+}
+
+static int write_reg_word(struct regmap *regmap, u8 reg, u16 val)
+{
+ u8 bulk_val[2];
+
+ bulk_val[0] = U16_MSB(val);
+ bulk_val[1] = U16_LSB(val);
+
+ return regmap_bulk_write(regmap, reg, bulk_val, 2);
+}
+
static int max31790_read_fan(struct device *dev, u32 attr, int channel,
long *val)
{
- struct max31790_data *data = max31790_update_device(dev);
- int sr, rpm;
-
- if (IS_ERR(data))
- return PTR_ERR(data);
+ struct max31790_data *data = dev_get_drvdata(dev);
+ struct regmap *regmap = data->regmap;
+ int tach, fault;
switch (attr) {
case hwmon_fan_input:
- sr = get_tach_period(data->fan_dynamics[channel]);
- rpm = RPM_FROM_REG(data->tach[channel], sr);
- *val = rpm;
+ tach = read_reg_word(regmap, MAX31790_REG_TACH_COUNT(channel));
+ if (tach < 0)
+ return tach;
+
+ *val = RPM_FROM_REG(tach, get_tach_period(data->fan_dynamics[channel]));
return 0;
case hwmon_fan_target:
- sr = get_tach_period(data->fan_dynamics[channel]);
- rpm = RPM_FROM_REG(data->target_count[channel], sr);
- *val = rpm;
+ tach = read_reg_word(regmap, MAX31790_REG_TARGET_COUNT(channel));
+ if (tach < 0)
+ return tach;
+
+ *val = RPM_FROM_REG(tach, get_tach_period(data->fan_dynamics[channel]));
return 0;
case hwmon_fan_fault:
- *val = !!(data->fault_status & (1 << channel));
+ if (channel > 6)
+ fault = read_reg_byte(regmap, MAX31790_REG_FAN_FAULT_STATUS2);
+ else
+ fault = read_reg_byte(regmap, MAX31790_REG_FAN_FAULT_STATUS1);
+
+ if (fault < 0)
+ return fault;
+
+ if (channel > 6)
+ *val = !!(fault & (1 << (channel - 6)));
+ else
+ *val = !!(fault & (1 << channel));
return 0;
default:
return -EOPNOTSUPP;
@@ -191,7 +201,7 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
long val)
{
struct max31790_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
+ struct regmap *regmap = data->regmap;
int target_count;
int err = 0;
u8 bits;
@@ -207,9 +217,10 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
((data->fan_dynamics[channel] &
~MAX31790_FAN_DYN_SR_MASK) |
(bits << MAX31790_FAN_DYN_SR_SHIFT));
- err = i2c_smbus_write_byte_data(client,
- MAX31790_REG_FAN_DYNAMICS(channel),
- data->fan_dynamics[channel]);
+
+ err = regmap_write(regmap,
+ MAX31790_REG_FAN_DYNAMICS(channel),
+ data->fan_dynamics[channel]);
if (err < 0)
break;
@@ -217,11 +228,11 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
target_count = RPM_TO_REG(val, sr);
target_count = clamp_val(target_count, 0x1, 0x7FF);
- data->target_count[channel] = target_count << 5;
+ target_count = target_count << 5;
- err = i2c_smbus_write_word_swapped(client,
- MAX31790_REG_TARGET_COUNT(channel),
- data->target_count[channel]);
+ err = write_reg_word(regmap,
+ MAX31790_REG_TARGET_COUNT(channel),
+ target_count);
break;
default:
err = -EOPNOTSUPP;
@@ -258,22 +269,22 @@ static umode_t max31790_fan_is_visible(const void *_data, u32 attr, int channel)
static int max31790_read_pwm(struct device *dev, u32 attr, int channel,
long *val)
{
- struct max31790_data *data = max31790_update_device(dev);
- u8 fan_config;
-
- if (IS_ERR(data))
- return PTR_ERR(data);
-
- fan_config = data->fan_config[channel];
+ struct max31790_data *data = dev_get_drvdata(dev);
+ struct regmap *regmap = data->regmap;
+ int read;
switch (attr) {
case hwmon_pwm_input:
- *val = data->pwm[channel] >> 8;
+ read = read_reg_word(regmap, MAX31790_REG_PWMOUT(channel));
+ if (read < 0)
+ return read;
+
+ *val = read >> 8;
return 0;
case hwmon_pwm_enable:
- if (fan_config & MAX31790_FAN_CFG_RPM_MODE)
+ if (data->fan_config[channel] & MAX31790_FAN_CFG_RPM_MODE)
*val = 2;
- else if (fan_config & MAX31790_FAN_CFG_TACH_INPUT_EN)
+ else if (data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN)
*val = 1;
else
*val = 0;
@@ -287,7 +298,7 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
long val)
{
struct max31790_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
+ struct regmap *regmap = data->regmap;
u8 fan_config;
int err = 0;
@@ -299,10 +310,7 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
err = -EINVAL;
break;
}
- data->pwm[channel] = val << 8;
- err = i2c_smbus_write_word_swapped(client,
- MAX31790_REG_PWMOUT(channel),
- data->pwm[channel]);
+ err = write_reg_word(regmap, MAX31790_REG_PWMOUT(channel), val << 8);
break;
case hwmon_pwm_enable:
fan_config = data->fan_config[channel];
@@ -321,9 +329,9 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
break;
}
data->fan_config[channel] = fan_config;
- err = i2c_smbus_write_byte_data(client,
- MAX31790_REG_FAN_CONFIG(channel),
- fan_config);
+ err = regmap_write(regmap,
+ MAX31790_REG_FAN_CONFIG(channel),
+ fan_config);
break;
default:
err = -EOPNOTSUPP;
@@ -426,20 +434,18 @@ static const struct hwmon_chip_info max31790_chip_info = {
.info = max31790_info,
};
-static int max31790_init_client(struct i2c_client *client,
+static int max31790_init_client(struct regmap *regmap,
struct max31790_data *data)
{
int i, rv;
for (i = 0; i < NR_CHANNEL; i++) {
- rv = i2c_smbus_read_byte_data(client,
- MAX31790_REG_FAN_CONFIG(i));
+ rv = read_reg_byte(regmap, MAX31790_REG_FAN_CONFIG(i % NR_CHANNEL));
if (rv < 0)
return rv;
data->fan_config[i] = rv;
- rv = i2c_smbus_read_byte_data(client,
- MAX31790_REG_FAN_DYNAMICS(i));
+ rv = read_reg_byte(regmap, MAX31790_REG_FAN_DYNAMICS(i));
if (rv < 0)
return rv;
data->fan_dynamics[i] = rv;
@@ -464,13 +470,18 @@ static int max31790_probe(struct i2c_client *client)
if (!data)
return -ENOMEM;
- data->client = client;
mutex_init(&data->update_lock);
+ data->regmap = devm_regmap_init_i2c(client, &max31790_regmap_config);
+ if (IS_ERR(data->regmap)) {
+ dev_err(dev, "failed to allocate register map\n");
+ return PTR_ERR(data->regmap);
+ }
+
/*
* Initialize the max31790 chip
*/
- err = max31790_init_client(client, data);
+ err = max31790_init_client(data->regmap, data);
if (err)
return err;
--
2.31.1
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 2/5] hwmon: (max31790) Fix and split pwm*_enable
2021-04-26 12:37 ` [PATCH v4 " Václav Kubernát
@ 2021-04-26 12:37 ` Václav Kubernát
2021-04-26 12:37 ` [PATCH v4 3/5] hwmon: (max31790) Show 0 RPM/fault when input disabled Václav Kubernát
` (2 subsequent siblings)
3 siblings, 0 replies; 18+ messages in thread
From: Václav Kubernát @ 2021-04-26 12:37 UTC (permalink / raw)
Cc: Václav Kubernát, Jean Delvare, Guenter Roeck,
Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
In the old code, pwm*_enable does two things. Firstly, it sets whether
the chip should run in PWM or RPM mode. Secondly, it tells the chip
whether it should monitor fan RPM. However, these two settings aren't
tied together, so they shouldn't be set with a single value. In the new
code, fan*_enable now controls fan RPM monitoring (pwm*_enable no longer
controls that).
According to the sysfs hwmon documentation, pwm*_enable has three
possible values, 0 for "no control / full-speed", 1 for manual mode, and
2+ for automatic. The old code works fine for 1 and 2, but 0 only
differs from 1 in that it just turns off fan speed monitoring. The chip
actually does have a way to turn off fan controls (and only monitor),
but what that does is that it sets PWM to 0% duty cycle (which is the
opposite to full-speed) AND it also turns off fan speed monitoring.
Because of this, I implemented the 0 value by setting PWM mode to 100%.
This method does come with a problem: it is impossible to differentiate
between full-speed and PWM mode just from the values on the chip. The
new code solves this by saving a value indicating whether we're in
full-speed mode. This value is initialized to 0, so full-speed mode
won't persist across reboots.
These two changes are closely connected together, mainly because the
detection of the pwm*_enable value depended on whether fan speed
monitoring is enabled (which is now controlled as written in the first
paragraph).
Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
---
Documentation/hwmon/max31790.rst | 8 +--
drivers/hwmon/max31790.c | 87 ++++++++++++++++++++++----------
2 files changed, 66 insertions(+), 29 deletions(-)
diff --git a/Documentation/hwmon/max31790.rst b/Documentation/hwmon/max31790.rst
index f301385d8cef..8979c8a02cd1 100644
--- a/Documentation/hwmon/max31790.rst
+++ b/Documentation/hwmon/max31790.rst
@@ -34,10 +34,12 @@ also be configured to serve as tachometer inputs.
Sysfs entries
-------------
-================== === =======================================================
+================== === =============================================================
+fan[1-12]_enable RW enable fan speed monitoring
fan[1-12]_input RO fan tachometer speed in RPM
fan[1-12]_fault RO fan experienced fault
fan[1-6]_target RW desired fan speed in RPM
-pwm[1-6]_enable RW regulator mode, 0=disabled, 1=manual mode, 2=rpm mode
+pwm[1-6]_enable RW regulator mode, 0=full speed, 1=manual (pwm) mode, 2=rpm mode
+ setting rpm mode sets fan*_enable to 1
pwm[1-6] RW fan target duty cycle (0-255)
-================== === =======================================================
+================== === =============================================================
diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index 8b90fcc685f5..82d7b8518743 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -39,6 +39,7 @@
#define FAN_RPM_MIN 120
#define FAN_RPM_MAX 7864320
+#define MAX_PWM 0XFF80
#define RPM_FROM_REG(reg, sr) (((reg) >> 4) ? \
((60 * (sr) * 8192) / ((reg) >> 4)) : \
@@ -91,6 +92,7 @@ struct max31790_data {
struct regmap *regmap;
struct mutex update_lock;
+ bool full_speed[NR_CHANNEL];
u8 fan_config[NR_CHANNEL];
u8 fan_dynamics[NR_CHANNEL];
};
@@ -192,6 +194,9 @@ static int max31790_read_fan(struct device *dev, u32 attr, int channel,
else
*val = !!(fault & (1 << channel));
return 0;
+ case hwmon_fan_enable:
+ *val = !!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN);
+ return 0;
default:
return -EOPNOTSUPP;
}
@@ -234,6 +239,15 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
MAX31790_REG_TARGET_COUNT(channel),
target_count);
break;
+ case hwmon_fan_enable:
+ if (val == 0)
+ data->fan_config[channel] &= ~MAX31790_FAN_CFG_TACH_INPUT_EN;
+ else
+ data->fan_config[channel] |= MAX31790_FAN_CFG_TACH_INPUT_EN;
+ err = regmap_write(regmap,
+ MAX31790_REG_FAN_CONFIG(channel),
+ data->fan_config[channel]);
+ break;
default:
err = -EOPNOTSUPP;
break;
@@ -261,6 +275,11 @@ static umode_t max31790_fan_is_visible(const void *_data, u32 attr, int channel)
!(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
return 0644;
return 0;
+ case hwmon_fan_enable:
+ if (channel < NR_CHANNEL ||
+ (fan_config & MAX31790_FAN_CFG_TACH_INPUT))
+ return 0644;
+ return 0;
default:
return 0;
}
@@ -282,12 +301,12 @@ static int max31790_read_pwm(struct device *dev, u32 attr, int channel,
*val = read >> 8;
return 0;
case hwmon_pwm_enable:
- if (data->fan_config[channel] & MAX31790_FAN_CFG_RPM_MODE)
+ if (data->full_speed[channel])
+ *val = 0;
+ else if (data->fan_config[channel] & MAX31790_FAN_CFG_RPM_MODE)
*val = 2;
- else if (data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN)
+ else
*val = 1;
- else
- *val = 0;
return 0;
default:
return -EOPNOTSUPP;
@@ -306,28 +325,42 @@ static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
switch (attr) {
case hwmon_pwm_input:
- if (val < 0 || val > 255) {
+ if (data->full_speed[channel] || val < 0 || val > 255) {
err = -EINVAL;
break;
}
+
err = write_reg_word(regmap, MAX31790_REG_PWMOUT(channel), val << 8);
break;
case hwmon_pwm_enable:
fan_config = data->fan_config[channel];
- if (val == 0) {
- fan_config &= ~(MAX31790_FAN_CFG_TACH_INPUT_EN |
- MAX31790_FAN_CFG_RPM_MODE);
- } else if (val == 1) {
- fan_config = (fan_config |
- MAX31790_FAN_CFG_TACH_INPUT_EN) &
- ~MAX31790_FAN_CFG_RPM_MODE;
+ if (val == 0 || val == 1) {
+ fan_config &= ~MAX31790_FAN_CFG_RPM_MODE;
} else if (val == 2) {
- fan_config |= MAX31790_FAN_CFG_TACH_INPUT_EN |
- MAX31790_FAN_CFG_RPM_MODE;
+ fan_config |= MAX31790_FAN_CFG_RPM_MODE;
} else {
err = -EINVAL;
break;
}
+
+ /*
+ * The chip sets PWM to zero when using its "monitor only" mode
+ * and 0 means full speed.
+ */
+ if (val == 0) {
+ data->full_speed[channel] = true;
+ err = write_reg_word(regmap, MAX31790_REG_PWMOUT(channel), MAX_PWM);
+ } else {
+ data->full_speed[channel] = false;
+ }
+
+ /*
+ * RPM mode implies enabled TACH input, so enable it in RPM
+ * mode.
+ */
+ if (val == 2)
+ fan_config |= MAX31790_FAN_CFG_TACH_INPUT_EN;
+
data->fan_config[channel] = fan_config;
err = regmap_write(regmap,
MAX31790_REG_FAN_CONFIG(channel),
@@ -401,18 +434,18 @@ static umode_t max31790_is_visible(const void *data,
static const struct hwmon_channel_info *max31790_info[] = {
HWMON_CHANNEL_INFO(fan,
- HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_INPUT | HWMON_F_FAULT),
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT),
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
@@ -449,6 +482,8 @@ static int max31790_init_client(struct regmap *regmap,
if (rv < 0)
return rv;
data->fan_dynamics[i] = rv;
+
+ data->full_speed[i] = false;
}
return 0;
--
2.31.1
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 3/5] hwmon: (max31790) Show 0 RPM/fault when input disabled
2021-04-26 12:37 ` [PATCH v4 " Václav Kubernát
2021-04-26 12:37 ` [PATCH v4 2/5] hwmon: (max31790) Fix and split pwm*_enable Václav Kubernát
@ 2021-04-26 12:37 ` Václav Kubernát
2021-04-26 12:37 ` [PATCH v4 4/5] hwmon: (max31790) Allow setting fan*_div Václav Kubernát
2021-04-26 12:37 ` [PATCH v4 5/5] hwmon: (max31790) Update documentation Václav Kubernát
3 siblings, 0 replies; 18+ messages in thread
From: Václav Kubernát @ 2021-04-26 12:37 UTC (permalink / raw)
Cc: Václav Kubernát, Jean Delvare, Guenter Roeck,
Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
When fan speed input is disabled, it makes no sense to show values in
fan*_input and fan*_fault.
Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
---
drivers/hwmon/max31790.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index 82d7b8518743..842749482ba4 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -167,6 +167,9 @@ static int max31790_read_fan(struct device *dev, u32 attr, int channel,
switch (attr) {
case hwmon_fan_input:
+ if (!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN))
+ return -ENODATA;
+
tach = read_reg_word(regmap, MAX31790_REG_TACH_COUNT(channel));
if (tach < 0)
return tach;
@@ -181,6 +184,11 @@ static int max31790_read_fan(struct device *dev, u32 attr, int channel,
*val = RPM_FROM_REG(tach, get_tach_period(data->fan_dynamics[channel]));
return 0;
case hwmon_fan_fault:
+ if (!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN)) {
+ *val = 0;
+ return 0;
+ }
+
if (channel > 6)
fault = read_reg_byte(regmap, MAX31790_REG_FAN_FAULT_STATUS2);
else
--
2.31.1
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 4/5] hwmon: (max31790) Allow setting fan*_div
2021-04-26 12:37 ` [PATCH v4 " Václav Kubernát
2021-04-26 12:37 ` [PATCH v4 2/5] hwmon: (max31790) Fix and split pwm*_enable Václav Kubernát
2021-04-26 12:37 ` [PATCH v4 3/5] hwmon: (max31790) Show 0 RPM/fault when input disabled Václav Kubernát
@ 2021-04-26 12:37 ` Václav Kubernát
2021-04-26 12:37 ` [PATCH v4 5/5] hwmon: (max31790) Update documentation Václav Kubernát
3 siblings, 0 replies; 18+ messages in thread
From: Václav Kubernát @ 2021-04-26 12:37 UTC (permalink / raw)
Cc: Václav Kubernát, Jean Delvare, Guenter Roeck,
Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
Right now, the divisor (which determines the speed range) is only set
when in RPM mode. However, the speed range also affects the input RPM,
which means, to get more accurate readings, this speed range needs to be
set.
Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
---
Documentation/hwmon/max31790.rst | 1 +
drivers/hwmon/max31790.c | 66 ++++++++++++++++++++++++++------
2 files changed, 55 insertions(+), 12 deletions(-)
diff --git a/Documentation/hwmon/max31790.rst b/Documentation/hwmon/max31790.rst
index 8979c8a02cd1..2979addeac8f 100644
--- a/Documentation/hwmon/max31790.rst
+++ b/Documentation/hwmon/max31790.rst
@@ -38,6 +38,7 @@ Sysfs entries
fan[1-12]_enable RW enable fan speed monitoring
fan[1-12]_input RO fan tachometer speed in RPM
fan[1-12]_fault RO fan experienced fault
+fan[1-12]_div RW set the measurable speed range, not available in RPM mode
fan[1-6]_target RW desired fan speed in RPM
pwm[1-6]_enable RW regulator mode, 0=full speed, 1=manual (pwm) mode, 2=rpm mode
setting rpm mode sets fan*_enable to 1
diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
index 842749482ba4..9f8562d28a3b 100644
--- a/drivers/hwmon/max31790.c
+++ b/drivers/hwmon/max31790.c
@@ -158,6 +158,26 @@ static int write_reg_word(struct regmap *regmap, u8 reg, u16 val)
return regmap_bulk_write(regmap, reg, bulk_val, 2);
}
+static int bits_for_speed_range(long speed_range)
+{
+ switch (speed_range) {
+ case 1:
+ return 0x0;
+ case 2:
+ return 0x1;
+ case 4:
+ return 0x2;
+ case 8:
+ return 0x3;
+ case 16:
+ return 0x4;
+ case 32:
+ return 0x5;
+ default:
+ return -1;
+ }
+}
+
static int max31790_read_fan(struct device *dev, u32 attr, int channel,
long *val)
{
@@ -205,6 +225,9 @@ static int max31790_read_fan(struct device *dev, u32 attr, int channel,
case hwmon_fan_enable:
*val = !!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN);
return 0;
+ case hwmon_fan_div:
+ *val = get_tach_period(data->fan_config[channel]);
+ return 0;
default:
return -EOPNOTSUPP;
}
@@ -256,6 +279,24 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel,
MAX31790_REG_FAN_CONFIG(channel),
data->fan_config[channel]);
break;
+ case hwmon_fan_div:
+ if (data->fan_config[channel] & MAX31790_FAN_CFG_RPM_MODE) {
+ err = -EINVAL;
+ break;
+ }
+ sr = bits_for_speed_range(val);
+ if (sr < 0) {
+ err = -EINVAL;
+ break;
+ }
+
+ data->fan_dynamics[channel] = ((data->fan_dynamics[channel] &
+ ~MAX31790_FAN_DYN_SR_MASK) |
+ (sr << MAX31790_FAN_DYN_SR_SHIFT));
+ err = regmap_write(regmap,
+ MAX31790_REG_FAN_DYNAMICS(channel),
+ data->fan_dynamics[channel]);
+ break;
default:
err = -EOPNOTSUPP;
break;
@@ -284,6 +325,7 @@ static umode_t max31790_fan_is_visible(const void *_data, u32 attr, int channel)
return 0644;
return 0;
case hwmon_fan_enable:
+ case hwmon_fan_div:
if (channel < NR_CHANNEL ||
(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
return 0644;
@@ -442,18 +484,18 @@ static umode_t max31790_is_visible(const void *data,
static const struct hwmon_channel_info *max31790_info[] = {
HWMON_CHANNEL_INFO(fan,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
- HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT),
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT,
+ HWMON_F_DIV | HWMON_F_ENABLE | HWMON_F_INPUT | HWMON_F_FAULT),
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
--
2.31.1
^ permalink raw reply related [flat|nested] 18+ messages in thread
* [PATCH v4 5/5] hwmon: (max31790) Update documentation
2021-04-26 12:37 ` [PATCH v4 " Václav Kubernát
` (2 preceding siblings ...)
2021-04-26 12:37 ` [PATCH v4 4/5] hwmon: (max31790) Allow setting fan*_div Václav Kubernát
@ 2021-04-26 12:37 ` Václav Kubernát
3 siblings, 0 replies; 18+ messages in thread
From: Václav Kubernát @ 2021-04-26 12:37 UTC (permalink / raw)
Cc: Václav Kubernát, Jean Delvare, Guenter Roeck,
Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
The conditions for fan fault and its connection to the PWM mode are now
documented.
The pwm_rate_of_change and fan_window are now mentioned. According to
our testing with Sunon PF36281BX-000U-S99, these values are crucial in
how RPM mode works and how long it takes for the RPM to stabilize. For
example, setting 5000 RPM (the fan goes up to 23000), the
pwm_rate_of_change needed to be changed to the lowest possible value,
otherwise the chip would just go from pwm 0 to pwm 60 back and forth and
never achieving 5000 RPM (and also signaling fan fault). Based on this
testing, we found out that the pwm_rate_of_change and fan_window values
need to be changed manually by the user, based on the user's exact fan
configuration.
Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
---
Documentation/hwmon/max31790.rst | 41 +++++++++++++++++++++++++++++++-
1 file changed, 40 insertions(+), 1 deletion(-)
diff --git a/Documentation/hwmon/max31790.rst b/Documentation/hwmon/max31790.rst
index 2979addeac8f..6056b67c3a95 100644
--- a/Documentation/hwmon/max31790.rst
+++ b/Documentation/hwmon/max31790.rst
@@ -30,6 +30,44 @@ monitoring and control of fan RPM as well as detection of fan failure.
Six pins are dedicated tachometer inputs. Any of the six PWM outputs can
also be configured to serve as tachometer inputs.
+About pwm[1-6]_enable
+---------------------
+0 - full-speed
+ The chip doesn't have a specific way to set "full speed", so setting
+ pwm[1-6]_enable to 0 is just "set PWM mode with 255 duty cycle".
+1 - PWM mode
+ Fan speed is controlled by writing a value to pwm[1-6].
+2 - RPM mode
+ Fan speed is controlled by writing a value to fan[1-6]_target.
+
+About fan[1-6]_fault
+--------------------
+In PWM (or full-speed) mode, if the input RPM goes below what is set
+in fan[1-6]_target, fan[1-6]_fault gets set to 1. In other words,
+fan[1-6]_target works as the minimum input RPM before a fan fault goes off.
+
+In RPM mode, fan fault is set when the fan spins "too slowly" (exact
+conditions are in the datasheet). RPM mode depends on four variables:
+ target_speed: This is set by fan[1-6]_target.
+ speed_range: This is set automatically when setting target_speed
+ or manually by fan[1-12]_div.
+ pwm_rate_of_change: NOT set by the driver.
+ fan_window: NOT set by the driver.
+
+The last two values are not set by the driver, because there's no generic way to
+compute them. You should set them manually through i2c (in the bootloader for
+example). Check the datasheet for details.
+
+The fan fault value latches, to reset it, set a value to pwm[1-6]
+or fan[1-6]_target.
+
+About fan[1-12]_div
+-------------------
+This value affects the measurable range of the chip. The driver sets this value
+automatically in RPM based on fan[1-6]_target. In PWM mode, you should set this
+value manually based on the details from the datasheet. Setting the speed range
+is disabled while in RPM mode to prevent overwriting the automatically
+calculated value.
Sysfs entries
-------------
@@ -39,7 +77,8 @@ fan[1-12]_enable RW enable fan speed monitoring
fan[1-12]_input RO fan tachometer speed in RPM
fan[1-12]_fault RO fan experienced fault
fan[1-12]_div RW set the measurable speed range, not available in RPM mode
-fan[1-6]_target RW desired fan speed in RPM
+fan[1-6]_target RW RPM mode = desired fan speed
+ PWM mode = minimum fan speed until fault
pwm[1-6]_enable RW regulator mode, 0=full speed, 1=manual (pwm) mode, 2=rpm mode
setting rpm mode sets fan*_enable to 1
pwm[1-6] RW fan target duty cycle (0-255)
--
2.31.1
^ permalink raw reply related [flat|nested] 18+ messages in thread
* Re: [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap
2021-04-22 1:27 ` Guenter Roeck
2021-04-23 10:55 ` Václav Kubernát
@ 2021-04-26 12:46 ` Václav Kubernát
2021-04-26 14:17 ` Guenter Roeck
1 sibling, 1 reply; 18+ messages in thread
From: Václav Kubernát @ 2021-04-26 12:46 UTC (permalink / raw)
To: Guenter Roeck
Cc: Jean Delvare, Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
Hello.
I'm sending a new version of my patch on max31790. This new version
fixes the cache issue and actually makes it work by setting
.cache_type. You were right about the "yes/no" ranges, so I flipped
those.
By the way, it seems that the reason your reply got lost is because of
weird addresses in the "Cc:" email field, they end with "cesnet.cz",
so it could be that I'm sending email incorrectly. Let me know if I'm
doing something wrong.
Thanks,
Václav
čt 22. 4. 2021 v 3:31 odesílatel Guenter Roeck <linux@roeck-us.net> napsal:
>
> On 4/12/21 7:59 PM, Václav Kubernát wrote:
> > Converting the driver to use regmap makes it more generic. It also makes
> > it a lot easier to debug through debugfs.
> >
> > Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
> > ---
> > drivers/hwmon/Kconfig | 1 +
> > drivers/hwmon/max31790.c | 254 ++++++++++++++++++++-------------------
> > 2 files changed, 133 insertions(+), 122 deletions(-)
> >
> > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> > index 1ecf697d8d99..9f11d036c316 100644
> > --- a/drivers/hwmon/Kconfig
> > +++ b/drivers/hwmon/Kconfig
> > @@ -1095,6 +1095,7 @@ config SENSORS_MAX6697
> > config SENSORS_MAX31790
> > tristate "Maxim MAX31790 sensor chip"
> > depends on I2C
> > + select REGMAP_I2C
> > help
> > If you say yes here you get support for 6-Channel PWM-Output
> > Fan RPM Controller.
> > diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c
> > index 2c6b333a28e9..e3765ce4444a 100644
> > --- a/drivers/hwmon/max31790.c
> > +++ b/drivers/hwmon/max31790.c
> > @@ -12,6 +12,7 @@
> > #include <linux/init.h>
> > #include <linux/jiffies.h>
> > #include <linux/module.h>
> > +#include <linux/regmap.h>
> > #include <linux/slab.h>
> >
> > /* MAX31790 registers */
> > @@ -46,92 +47,53 @@
> >
> > #define NR_CHANNEL 6
> >
> > +#define MAX31790_REG_USER_BYTE_67 0x67
> > +
> > +#define BULK_TO_U16(msb, lsb) (((msb) << 8) + (lsb))
> > +#define U16_MSB(num) (((num) & 0xFF00) >> 8)
> > +#define U16_LSB(num) ((num) & 0x00FF)
> > +
> > +static const struct regmap_range max31790_ro_range = {
> > + .range_min = MAX31790_REG_TACH_COUNT(0),
> > + .range_max = MAX31790_REG_PWMOUT(0) - 1,
> > +};
> > +
> > +static const struct regmap_access_table max31790_wr_table = {
> > + .no_ranges = &max31790_ro_range,
> > + .n_no_ranges = 1,
> > +};
> > +
> > +static const struct regmap_range max31790_volatile_ranges[] = {
> > + regmap_reg_range(MAX31790_REG_TACH_COUNT(0), MAX31790_REG_TACH_COUNT(12)),
> > + regmap_reg_range(MAX31790_REG_FAN_FAULT_STATUS2, MAX31790_REG_FAN_FAULT_STATUS1),
> > +};
> > +
> > +static const struct regmap_access_table max31790_volatile_table = {
> > + .no_ranges = max31790_volatile_ranges,
> > + .n_no_ranges = 2,
> > + .n_yes_ranges = 0
> > +};
>
> Looks like my reply to this got lost. Other regmap code suggests that
> volatile register ranges are identified with yes_ranges, not with no_ranges.
> "no" seems to mean "not volatile". Please verify and confirm if the
> above code does what you want it to do.
>
> Thanks,
> Guenter
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap
2021-04-26 12:46 ` Václav Kubernát
@ 2021-04-26 14:17 ` Guenter Roeck
2021-04-26 14:29 ` Václav Kubernát
0 siblings, 1 reply; 18+ messages in thread
From: Guenter Roeck @ 2021-04-26 14:17 UTC (permalink / raw)
To: Václav Kubernát
Cc: Jean Delvare, Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
On Mon, Apr 26, 2021 at 02:46:27PM +0200, Václav Kubernát wrote:
> Hello.
>
> I'm sending a new version of my patch on max31790. This new version
> fixes the cache issue and actually makes it work by setting
> .cache_type. You were right about the "yes/no" ranges, so I flipped
> those.
>
> By the way, it seems that the reason your reply got lost is because of
> weird addresses in the "Cc:" email field, they end with "cesnet.cz",
> so it could be that I'm sending email incorrectly. Let me know if I'm
> doing something wrong.
>
Yes, the To: field of your series is either empty (for the first patch
of the series), or it is something like:
To: unlisted-recipients: no To-header on input <;
Also, you send your follow-up series as response of the previous series
which doesn't follow the guidance for submitting patches and may result
in the entire series getting lost.
Guenter
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap
2021-04-26 14:17 ` Guenter Roeck
@ 2021-04-26 14:29 ` Václav Kubernát
2021-04-26 14:35 ` Guenter Roeck
0 siblings, 1 reply; 18+ messages in thread
From: Václav Kubernát @ 2021-04-26 14:29 UTC (permalink / raw)
To: Guenter Roeck
Cc: Jean Delvare, Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
po 26. 4. 2021 v 16:18 odesílatel Guenter Roeck <linux@roeck-us.net> napsal:
>
> On Mon, Apr 26, 2021 at 02:46:27PM +0200, Václav Kubernát wrote:
> > Hello.
> >
> > I'm sending a new version of my patch on max31790. This new version
> > fixes the cache issue and actually makes it work by setting
> > .cache_type. You were right about the "yes/no" ranges, so I flipped
> > those.
> >
> > By the way, it seems that the reason your reply got lost is because of
> > weird addresses in the "Cc:" email field, they end with "cesnet.cz",
> > so it could be that I'm sending email incorrectly. Let me know if I'm
> > doing something wrong.
> >
>
> Yes, the To: field of your series is either empty (for the first patch
> of the series), or it is something like:
> To: unlisted-recipients: no To-header on input <;
>
> Also, you send your follow-up series as response of the previous series
> which doesn't follow the guidance for submitting patches and may result
> in the entire series getting lost.
>
Sorry, I will fix my email-sending procedure. Should I resend the
patch series without the In-Reply-To field?
Václav
> Guenter
^ permalink raw reply [flat|nested] 18+ messages in thread
* Re: [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap
2021-04-26 14:29 ` Václav Kubernát
@ 2021-04-26 14:35 ` Guenter Roeck
0 siblings, 0 replies; 18+ messages in thread
From: Guenter Roeck @ 2021-04-26 14:35 UTC (permalink / raw)
To: Václav Kubernát
Cc: Jean Delvare, Jonathan Corbet, linux-hwmon, linux-doc, linux-kernel
On Mon, Apr 26, 2021 at 04:29:55PM +0200, Václav Kubernát wrote:
> po 26. 4. 2021 v 16:18 odesílatel Guenter Roeck <linux@roeck-us.net> napsal:
> >
> > On Mon, Apr 26, 2021 at 02:46:27PM +0200, Václav Kubernát wrote:
> > > Hello.
> > >
> > > I'm sending a new version of my patch on max31790. This new version
> > > fixes the cache issue and actually makes it work by setting
> > > .cache_type. You were right about the "yes/no" ranges, so I flipped
> > > those.
> > >
> > > By the way, it seems that the reason your reply got lost is because of
> > > weird addresses in the "Cc:" email field, they end with "cesnet.cz",
> > > so it could be that I'm sending email incorrectly. Let me know if I'm
> > > doing something wrong.
> > >
> >
> > Yes, the To: field of your series is either empty (for the first patch
> > of the series), or it is something like:
> > To: unlisted-recipients: no To-header on input <;
> >
> > Also, you send your follow-up series as response of the previous series
> > which doesn't follow the guidance for submitting patches and may result
> > in the entire series getting lost.
> >
>
> Sorry, I will fix my email-sending procedure. Should I resend the
> patch series without the In-Reply-To field?
>
No, just keep it in mind for next time.
Thanks,
Guenter
^ permalink raw reply [flat|nested] 18+ messages in thread
end of thread, other threads:[~2021-04-26 14:36 UTC | newest]
Thread overview: 18+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-04-13 2:59 [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap Václav Kubernát
2021-04-13 2:59 ` [PATCH v2 2/5] hwmon: (max31790) Fix and split pwm*_enable Václav Kubernát
[not found] ` <20210419223340.GA229491@roeck-us.net>
2021-04-22 0:26 ` Václav Kubernát
2021-04-13 2:59 ` [PATCH v2 3/5] hwmon: (max31790) Show 0 RPM/fault when input disabled Václav Kubernát
2021-04-13 2:59 ` [PATCH v2 4/5] hwmon: (max31790) Allow setting fan*_div Václav Kubernát
2021-04-13 2:59 ` [PATCH v2 5/5] hwmon: (max31790) Update documentation Václav Kubernát
2021-04-13 3:10 ` [PATCH v2 1/5] hwmon: (max31790) Rework to use regmap Václav Kubernát
2021-04-22 1:27 ` Guenter Roeck
2021-04-23 10:55 ` Václav Kubernát
2021-04-26 12:46 ` Václav Kubernát
2021-04-26 14:17 ` Guenter Roeck
2021-04-26 14:29 ` Václav Kubernát
2021-04-26 14:35 ` Guenter Roeck
2021-04-26 12:37 ` [PATCH v4 " Václav Kubernát
2021-04-26 12:37 ` [PATCH v4 2/5] hwmon: (max31790) Fix and split pwm*_enable Václav Kubernát
2021-04-26 12:37 ` [PATCH v4 3/5] hwmon: (max31790) Show 0 RPM/fault when input disabled Václav Kubernát
2021-04-26 12:37 ` [PATCH v4 4/5] hwmon: (max31790) Allow setting fan*_div Václav Kubernát
2021-04-26 12:37 ` [PATCH v4 5/5] hwmon: (max31790) Update documentation Václav Kubernát
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