* [PATCH] power: supply: max17047: Add Maxim MAX17047 Fuel Gauge battery driver
@ 2017-04-03 11:16 Hans de Goede
2017-04-11 14:42 ` Sebastian Reichel
0 siblings, 1 reply; 3+ messages in thread
From: Hans de Goede @ 2017-04-03 11:16 UTC (permalink / raw)
To: Sebastian Reichel; +Cc: Hans de Goede, Takashi Iwai, linux-pm
This commit adds support for the Maxim MAX17047 Fuel Gauge chip.
This was tested on a GPDwin x86 Cherry Trail machine which uses the
Maxim MAX17047 Fuel Gauge in combination with a TI bq24292i charger.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/power/supply/Kconfig | 7 +
drivers/power/supply/Makefile | 1 +
drivers/power/supply/max17047_battery.c | 286 ++++++++++++++++++++++++++++++++
3 files changed, 294 insertions(+)
create mode 100644 drivers/power/supply/max17047_battery.c
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index fd93110..2857513 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -538,4 +538,11 @@ config AXP20X_POWER
This driver provides support for the power supply features of
AXP20x PMIC.
+config BATTERY_MAX17047
+ tristate "Maxim MAX17047 fuel gauge driver"
+ depends on I2C
+ help
+ Say Y here to enable support for battery monitoring with
+ Maxim MAX17047 fuel gauge chips.
+
endif # POWER_SUPPLY
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 3789a2c..bc72775 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -74,3 +74,4 @@ obj-$(CONFIG_CHARGER_TPS65090) += tps65090-charger.o
obj-$(CONFIG_CHARGER_TPS65217) += tps65217_charger.o
obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o
obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o
+obj-$(CONFIG_BATTERY_MAX17047) += max17047_battery.o
diff --git a/drivers/power/supply/max17047_battery.c b/drivers/power/supply/max17047_battery.c
new file mode 100644
index 0000000..dc7304c
--- /dev/null
+++ b/drivers/power/supply/max17047_battery.c
@@ -0,0 +1,286 @@
+/*
+ * Maxim MAX17047 fuel gauge driver
+ * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/power_supply.h>
+#include <linux/slab.h>
+
+#define MAX17047_STATUS 0x00
+#define MAX17047_STATUS_BAT_NOT_PRESENT BIT(3)
+#define MAX17047_REM_CAP_REP 0x05
+#define MAX17047_SOC_REP 0x06
+#define MAX17047_VCELL 0x09
+#define MAX17047_CURRENT 0x0a
+#define MAX17047_AVG_CURRENT 0x0b
+#define MAX17047_FULL_CAP 0x10
+#define MAX17047_FULL_SOC_THR 0x13
+#define MAX17047_DESIGN_CAP 0x18
+#define MAX17047_AVG_VCELL 0x19
+#define MAX17047_MAXMIN_VCELL 0x1b
+#define MAX17047_VFOCV 0xfb
+
+/* A-scales are based on the reference design Rsense = 0.010Ω. */
+#define UAH_SCALE 500, false
+#define UA_SCALE 156, true
+#define UV_SCALE (625 / 8), false
+
+/* Consider REM_CAP_REP which is less then 10 units below FULL_CAP full */
+#define FULL_THRESHOLD 10
+
+struct max17047_fg_data {
+ struct i2c_client *client;
+ struct power_supply *battery;
+};
+
+static int max17047_get(struct max17047_fg_data *fg, u8 reg,
+ union power_supply_propval *val,
+ int scale, bool sign_extend)
+{
+ int ret;
+
+ ret = i2c_smbus_read_word_data(fg->client, reg);
+ if (ret < 0)
+ return ret;
+
+ if (sign_extend)
+ ret = sign_extend32(ret, 15);
+
+ val->intval = ret * scale;
+
+ return 0;
+}
+
+static int max17047_get_status(struct max17047_fg_data *fg,
+ union power_supply_propval *val)
+{
+ int charge_full, charge_now;
+
+ if (!power_supply_am_i_supplied(fg->battery)) {
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ return 0;
+ }
+
+ /*
+ * The MAX17047 has builtin end-of-charge detection and will update
+ * FULL_CAP to match REM_CAP_REP when it detects end of charging.
+ *
+ * When this cycle the battery gets charged to a higher (calculated)
+ * capacity then the previous cycle then FULL_CAP will get updated
+ * contineously once end-of-charge detection kicks in, so allow the
+ * 2 to differ a bit.
+ */
+
+ charge_full = i2c_smbus_read_word_data(fg->client, MAX17047_FULL_CAP);
+ if (charge_full < 0)
+ return charge_full;
+
+ charge_now = i2c_smbus_read_word_data(fg->client, MAX17047_REM_CAP_REP);
+ if (charge_now < 0)
+ return charge_now;
+
+ if ((charge_full - charge_now) <= FULL_THRESHOLD)
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ else
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+
+ return 0;
+}
+
+static int max17047_get_present(struct max17047_fg_data *fg,
+ union power_supply_propval *val)
+{
+ int ret;
+
+ ret = i2c_smbus_read_word_data(fg->client, MAX17047_STATUS);
+ if (ret < 0)
+ return ret;
+
+ if (ret & MAX17047_STATUS_BAT_NOT_PRESENT)
+ val->intval = 0;
+ else
+ val->intval = 1;
+
+ return 0;
+}
+
+static int max17047_get_min_max_volt(struct max17047_fg_data *fg,
+ union power_supply_propval *min_val,
+ union power_supply_propval *max_val)
+{
+ int ret;
+
+ ret = i2c_smbus_read_word_data(fg->client, MAX17047_MAXMIN_VCELL);
+ if (ret < 0)
+ return ret;
+
+ if (min_val)
+ /* Lower byte contains min in 20mV units */
+ min_val->intval = (ret & 0xff) * 20000;
+
+ if (max_val)
+ /* Upper byte contains max in 20mV units */
+ max_val->intval = (ret >> 8) * 20000;
+
+ return 0;
+}
+
+static int max17047_get_property(struct power_supply *psy,
+ enum power_supply_property prop, union power_supply_propval *val)
+{
+ struct max17047_fg_data *fg = power_supply_get_drvdata(psy);
+ int ret = 0;
+
+ switch (prop) {
+ case POWER_SUPPLY_PROP_STATUS:
+ ret = max17047_get_status(fg, val);
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ ret = max17047_get_present(fg, val);
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX:
+ max17047_get_min_max_volt(fg, NULL, val);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN:
+ max17047_get_min_max_volt(fg, val, NULL);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ ret = max17047_get(fg, MAX17047_VCELL, val, UV_SCALE);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+ ret = max17047_get(fg, MAX17047_AVG_VCELL, val, UV_SCALE);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_OCV:
+ ret = max17047_get(fg, MAX17047_VFOCV, val, UV_SCALE);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ ret = max17047_get(fg, MAX17047_CURRENT, val, UA_SCALE);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_AVG:
+ ret = max17047_get(fg, MAX17047_AVG_CURRENT, val, UA_SCALE);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ ret = max17047_get(fg, MAX17047_DESIGN_CAP, val, UAH_SCALE);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ ret = max17047_get(fg, MAX17047_FULL_CAP, val, UAH_SCALE);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ ret = max17047_get(fg, MAX17047_REM_CAP_REP, val, UAH_SCALE);
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ ret = i2c_smbus_read_word_data(fg->client, MAX17047_SOC_REP);
+ if (ret >= 0)
+ val->intval = ret >> 8; /* Reg is in fixed 8.8 fmt */
+ break;
+ case POWER_SUPPLY_PROP_SCOPE:
+ val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
+ break;
+ default:
+ ret = -ENODATA;
+ }
+
+ return ret;
+}
+
+static void max17047_external_power_changed(struct power_supply *psy)
+{
+ power_supply_changed(psy);
+}
+
+static enum power_supply_property max17047_properties[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_VOLTAGE_AVG,
+ POWER_SUPPLY_PROP_VOLTAGE_OCV,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CURRENT_AVG,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_SCOPE,
+};
+
+static const struct power_supply_desc bat_desc = {
+ /* .name must match chargers supplied_to setting, do not change */
+ .name = "main-battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = max17047_properties,
+ .num_properties = ARRAY_SIZE(max17047_properties),
+ .get_property = max17047_get_property,
+ .external_power_changed = max17047_external_power_changed,
+};
+
+static int max17047_probe(struct i2c_client *client,
+ const struct i2c_device_id *i2c_id)
+{
+ struct device *dev = &client->dev;
+ struct power_supply_config bat_cfg = {};
+ struct max17047_fg_data *fg;
+ int ret;
+
+ fg = devm_kzalloc(dev, sizeof(*fg), GFP_KERNEL);
+ if (!fg)
+ return -ENOMEM;
+
+ fg->client = client;
+
+ /*
+ * Enable End-of-Charge Detection when the voltage FG reports 95%
+ * or more, as recommend in the datasheet.
+ */
+ ret = i2c_smbus_write_word_data(fg->client, MAX17047_FULL_SOC_THR,
+ 95 << 8);
+ if (ret < 0) {
+ dev_err(dev, "Error setting FULL_SOC_THR: %d\n", ret);
+ return ret;
+ }
+
+ bat_cfg.drv_data = fg;
+ fg->battery = devm_power_supply_register(dev, &bat_desc, &bat_cfg);
+ if (IS_ERR(fg->battery))
+ return PTR_ERR(fg->battery);
+
+ return 0;
+}
+
+static const struct i2c_device_id max17047_i2c_id[] = {
+ { "max17047", },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max17047_i2c_id);
+
+static struct i2c_driver max17047_driver = {
+ .driver = {
+ .name = "CHT Whiskey Cove PMIC Fuel Gauge",
+ },
+ .probe = max17047_probe,
+ .id_table = max17047_i2c_id,
+};
+
+module_i2c_driver(max17047_driver);
+
+MODULE_DESCRIPTION("Maxim MAX17047 fuel gauge driver");
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_LICENSE("GPL");
--
2.9.3
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] power: supply: max17047: Add Maxim MAX17047 Fuel Gauge battery driver
2017-04-03 11:16 [PATCH] power: supply: max17047: Add Maxim MAX17047 Fuel Gauge battery driver Hans de Goede
@ 2017-04-11 14:42 ` Sebastian Reichel
2017-04-12 7:11 ` Hans de Goede
0 siblings, 1 reply; 3+ messages in thread
From: Sebastian Reichel @ 2017-04-11 14:42 UTC (permalink / raw)
To: Hans de Goede; +Cc: Takashi Iwai, linux-pm
[-- Attachment #1: Type: text/plain, Size: 735 bytes --]
Hi,
On Mon, Apr 03, 2017 at 01:16:47PM +0200, Hans de Goede wrote:
> This commit adds support for the Maxim MAX17047 Fuel Gauge chip.
>
> This was tested on a GPDwin x86 Cherry Trail machine which uses the
> Maxim MAX17047 Fuel Gauge in combination with a TI bq24292i charger.
>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>
> ---
> drivers/power/supply/Kconfig | 7 +
> drivers/power/supply/Makefile | 1 +
> drivers/power/supply/max17047_battery.c | 286 ++++++++++++++++++++++++++++++++
> 3 files changed, 294 insertions(+)
> create mode 100644 drivers/power/supply/max17047_battery.c
max17047 is already supported by drivers/power/supply/max17042_battery.c
-- Sebastian
[-- Attachment #2: signature.asc --]
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] power: supply: max17047: Add Maxim MAX17047 Fuel Gauge battery driver
2017-04-11 14:42 ` Sebastian Reichel
@ 2017-04-12 7:11 ` Hans de Goede
0 siblings, 0 replies; 3+ messages in thread
From: Hans de Goede @ 2017-04-12 7:11 UTC (permalink / raw)
To: Sebastian Reichel; +Cc: Takashi Iwai, linux-pm
Hi,
On 11-04-17 16:42, Sebastian Reichel wrote:
> Hi,
>
> On Mon, Apr 03, 2017 at 01:16:47PM +0200, Hans de Goede wrote:
>> This commit adds support for the Maxim MAX17047 Fuel Gauge chip.
>>
>> This was tested on a GPDwin x86 Cherry Trail machine which uses the
>> Maxim MAX17047 Fuel Gauge in combination with a TI bq24292i charger.
>>
>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>>
>> ---
>> drivers/power/supply/Kconfig | 7 +
>> drivers/power/supply/Makefile | 1 +
>> drivers/power/supply/max17047_battery.c | 286 ++++++++++++++++++++++++++++++++
>> 3 files changed, 294 insertions(+)
>> create mode 100644 drivers/power/supply/max17047_battery.c
>
> max17047 is already supported by drivers/power/supply/max17042_battery.c
Ah I checked but somehow missed that. The existing driver is not going
to work for the ACPI/X86 system I'm working with due to lack of platform_data
but that can be fixed by providing some minimal default pdata for that
case, I will write a patch for this.
Regsrds,
Hans
^ permalink raw reply [flat|nested] 3+ messages in thread
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2017-04-03 11:16 [PATCH] power: supply: max17047: Add Maxim MAX17047 Fuel Gauge battery driver Hans de Goede
2017-04-11 14:42 ` Sebastian Reichel
2017-04-12 7:11 ` Hans de Goede
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