[PATCH AUTOSEL 4.19 294/671] hwmon: (w83627hf) Use request_muxed_region for Super-IO accesses

[PATCH AUTOSEL 4.19 294/671] hwmon: (w83627hf) Use request_muxed_region for Super-IO accesses

[Sasha Levin]

From: Guenter Roeck <linux@roeck-us.net>

[ Upstream commit e95fd518d05bfc087da6fcdea4900a57cfb083bd ]

Super-IO accesses may fail on a system with no or unmapped LPC bus.

Also, other drivers may attempt to access the LPC bus at the same time,
resulting in undefined behavior.

Use request_muxed_region() to ensure that IO access on the requested
address space is supported, and to ensure that access by multiple drivers
is synchronized.

Fixes: b72656dbc491 ("hwmon: (w83627hf) Stop using globals for I/O port numbers")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hwmon/w83627hf.c | 42 +++++++++++++++++++++++++++++++++++-----
 1 file changed, 37 insertions(+), 5 deletions(-)

diff --git a/drivers/hwmon/w83627hf.c b/drivers/hwmon/w83627hf.c
index 8ac89d0781cc..a575e1cdb81a 100644
--- a/drivers/hwmon/w83627hf.c
+++ b/drivers/hwmon/w83627hf.c
@@ -130,17 +130,23 @@ superio_select(struct w83627hf_sio_data *sio, int ld)
 	outb(ld,  sio->sioaddr + 1);
 }
 
-static inline void
+static inline int
 superio_enter(struct w83627hf_sio_data *sio)
 {
+	if (!request_muxed_region(sio->sioaddr, 2, DRVNAME))
+		return -EBUSY;
+
 	outb(0x87, sio->sioaddr);
 	outb(0x87, sio->sioaddr);
+
+	return 0;
 }
 
 static inline void
 superio_exit(struct w83627hf_sio_data *sio)
 {
 	outb(0xAA, sio->sioaddr);
+	release_region(sio->sioaddr, 2);
 }
 
 #define W627_DEVID 0x52
@@ -1278,7 +1284,7 @@ static DEVICE_ATTR_RO(name);
 static int __init w83627hf_find(int sioaddr, unsigned short *addr,
 				struct w83627hf_sio_data *sio_data)
 {
-	int err = -ENODEV;
+	int err;
 	u16 val;
 
 	static __initconst char *const names[] = {
@@ -1290,7 +1296,11 @@ static int __init w83627hf_find(int sioaddr, unsigned short *addr,
 	};
 
 	sio_data->sioaddr = sioaddr;
-	superio_enter(sio_data);
+	err = superio_enter(sio_data);
+	if (err)
+		return err;
+
+	err = -ENODEV;
 	val = force_id ? force_id : superio_inb(sio_data, DEVID);
 	switch (val) {
 	case W627_DEVID:
@@ -1644,9 +1654,21 @@ static int w83627thf_read_gpio5(struct platform_device *pdev)
 	struct w83627hf_sio_data *sio_data = dev_get_platdata(&pdev->dev);
 	int res = 0xff, sel;
 
-	superio_enter(sio_data);
+	if (superio_enter(sio_data)) {
+		/*
+		 * Some other driver reserved the address space for itself.
+		 * We don't want to fail driver instantiation because of that,
+		 * so display a warning and keep going.
+		 */
+		dev_warn(&pdev->dev,
+			 "Can not read VID data: Failed to enable SuperIO access\n");
+		return res;
+	}
+
 	superio_select(sio_data, W83627HF_LD_GPIO5);
 
+	res = 0xff;
+
 	/* Make sure these GPIO pins are enabled */
 	if (!(superio_inb(sio_data, W83627THF_GPIO5_EN) & (1<<3))) {
 		dev_dbg(&pdev->dev, "GPIO5 disabled, no VID function\n");
@@ -1677,7 +1699,17 @@ static int w83687thf_read_vid(struct platform_device *pdev)
 	struct w83627hf_sio_data *sio_data = dev_get_platdata(&pdev->dev);
 	int res = 0xff;
 
-	superio_enter(sio_data);
+	if (superio_enter(sio_data)) {
+		/*
+		 * Some other driver reserved the address space for itself.
+		 * We don't want to fail driver instantiation because of that,
+		 * so display a warning and keep going.
+		 */
+		dev_warn(&pdev->dev,
+			 "Can not read VID data: Failed to enable SuperIO access\n");
+		return res;
+	}
+
 	superio_select(sio_data, W83627HF_LD_HWM);
 
 	/* Make sure these GPIO pins are enabled */
-- 
2.20.1

[PATCH AUTOSEL 4.19 514/671] hwmon: (lm75) Fix write operations for negative temperatures

[Sasha Levin]

From: Guenter Roeck <linux@roeck-us.net>

[ Upstream commit 7d82fcc9d9e81241778aaa22fda7be753e237d86 ]

Writes into limit registers fail if the temperature written is negative.
The regmap write operation checks the value range, regmap_write accepts
an unsigned int as parameter, and the temperature value passed to
regmap_write is kept in a variable declared as long. Negative values
are converted large unsigned integers, which fails the range check.
Fix by type casting the temperature to u16 when calling regmap_write().

Cc: Iker Perez del Palomar Sustatxa <iker.perez@codethink.co.uk>
Fixes: e65365fed87f ("hwmon: (lm75) Convert to use regmap")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hwmon/lm75.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 49f4b33a5685..7f28912c9abc 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -165,7 +165,7 @@ static int lm75_write(struct device *dev, enum hwmon_sensor_types type,
 	temp = DIV_ROUND_CLOSEST(temp  << (resolution - 8),
 				 1000) << (16 - resolution);
 
-	return regmap_write(data->regmap, reg, temp);
+	return regmap_write(data->regmap, reg, (u16)temp);
 }
 
 static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type,
-- 
2.20.1

[PATCH AUTOSEL 4.19 544/671] hwmon: (shtc1) fix shtc1 and shtw1 id mask

[Sasha Levin]

From: Dan Robertson <dan@dlrobertson.com>

[ Upstream commit fdc7d8e829ec755c5cfb2f5a8d8c0cdfb664f895 ]

Fix an error in the bitmaskfor the shtc1 and shtw1 bitmask used to
retrieve the chip ID from the ID register. See section 5.7 of the shtw1
or shtc1 datasheet for details.

Fixes: 1a539d372edd9832444e7a3daa710c444c014dc9 ("hwmon: add support for Sensirion SHTC1 sensor")
Signed-off-by: Dan Robertson <dan@dlrobertson.com>
Link: https://lore.kernel.org/r/20190905014554.21658-3-dan@dlrobertson.com
[groeck: Reordered to be first in series and adjusted accordingly]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hwmon/shtc1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/shtc1.c b/drivers/hwmon/shtc1.c
index decd7df995ab..2a18539591ea 100644
--- a/drivers/hwmon/shtc1.c
+++ b/drivers/hwmon/shtc1.c
@@ -38,7 +38,7 @@ static const unsigned char shtc1_cmd_read_id_reg[]	       = { 0xef, 0xc8 };
 
 /* constants for reading the ID register */
 #define SHTC1_ID	  0x07
-#define SHTC1_ID_REG_MASK 0x1f
+#define SHTC1_ID_REG_MASK 0x3f
 
 /* delays for non-blocking i2c commands, both in us */
 #define SHTC1_NONBLOCKING_WAIT_TIME_HPM  14400
-- 
2.20.1

[PATCH AUTOSEL 4.19 636/671] hwmon: (pmbus/ibm-cffps) Switch LEDs to blocking brightness call

[Sasha Levin]

From: Eddie James <eajames@linux.ibm.com>

[ Upstream commit 9861ff954c7e83e2f738ce16fbe15f8a1e121771 ]

Since i2c_smbus functions can sleep, the brightness setting function
for this driver must be the blocking version to avoid scheduling while
atomic.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20191106200106.29519-2-eajames@linux.ibm.com
Fixes: ef9e1cdf419a3 ("hwmon: (pmbus/cffps) Add led class device for power supply fault led")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hwmon/pmbus/ibm-cffps.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
index 93d9a9ea112b..edc70ac7d2d0 100644
--- a/drivers/hwmon/pmbus/ibm-cffps.c
+++ b/drivers/hwmon/pmbus/ibm-cffps.c
@@ -269,8 +269,8 @@ static int ibm_cffps_read_word_data(struct i2c_client *client, int page,
 	return rc;
 }
 
-static void ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
-					 enum led_brightness brightness)
+static int ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
+					enum led_brightness brightness)
 {
 	int rc;
 	struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
@@ -286,9 +286,11 @@ static void ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
 	rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
 				       psu->led_state);
 	if (rc < 0)
-		return;
+		return rc;
 
 	led_cdev->brightness = brightness;
+
+	return 0;
 }
 
 static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
@@ -324,7 +326,7 @@ static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
 		 client->addr);
 	psu->led.name = psu->led_name;
 	psu->led.max_brightness = LED_FULL;
-	psu->led.brightness_set = ibm_cffps_led_brightness_set;
+	psu->led.brightness_set_blocking = ibm_cffps_led_brightness_set;
 	psu->led.blink_set = ibm_cffps_led_blink_set;
 
 	rc = devm_led_classdev_register(dev, &psu->led);
-- 
2.20.1