diff options
Diffstat (limited to 'target/linux/apm821xx/patches-5.10/804-hwmon-tc654-add-thermal_cooling-device.patch')
| -rw-r--r-- | target/linux/apm821xx/patches-5.10/804-hwmon-tc654-add-thermal_cooling-device.patch | 150 |
1 files changed, 71 insertions, 79 deletions
diff --git a/target/linux/apm821xx/patches-5.10/804-hwmon-tc654-add-thermal_cooling-device.patch b/target/linux/apm821xx/patches-5.10/804-hwmon-tc654-add-thermal_cooling-device.patch index 0d2bd79fd7..466507a8fb 100644 --- a/target/linux/apm821xx/patches-5.10/804-hwmon-tc654-add-thermal_cooling-device.patch +++ b/target/linux/apm821xx/patches-5.10/804-hwmon-tc654-add-thermal_cooling-device.patch @@ -1,16 +1,20 @@ -From 9cb27801b5cbad2e1aaf45aac428cb2fac5e1372 Mon Sep 17 00:00:00 2001 +From 4d49367c5303e3ebd17502a45b74de280f6be539 Mon Sep 17 00:00:00 2001 From: Christian Lamparter <chunkeey@gmail.com> -Date: Sun, 17 Dec 2017 17:29:13 +0100 -Subject: [PATCH] hwmon: tc654: add thermal_cooling device +Date: Sun, 13 Feb 2022 01:47:33 +0100 +Subject: hwmon: (tc654) Add thermal_cooling device support -This patch adds a thermaL_cooling device to the tc654 driver. -This allows the chip to be used for DT-based cooling. +Adds thermal_cooling device support to the tc654/tc655 +driver. This make it possible to integrate it into a +device-tree supported thermal-zone node as a +cooling device. + +I have been using this patch as part of the Netgear WNDR4700 +Centria NAS Router support within OpenWrt since 2016. Signed-off-by: Christian Lamparter <chunkeey@gmail.com> +Link: https://lore.kernel.org/r/20220213004733.2421193-1-chunkeey@gmail.com +Signed-off-by: Guenter Roeck <linux@roeck-us.net> --- - drivers/hwmon/tc654.c | 103 +++++++++++++++++++++++++++++++++++------- - 1 file changed, 86 insertions(+), 17 deletions(-) - --- a/drivers/hwmon/tc654.c +++ b/drivers/hwmon/tc654.c @@ -15,6 +15,7 @@ @@ -21,44 +25,8 @@ Signed-off-by: Christian Lamparter <chunkeey@gmail.com> #include <linux/util_macros.h> enum tc654_regs { -@@ -132,6 +133,9 @@ struct tc654_data { - * writable register used to control the duty - * cycle of the V OUT output. - */ -+ -+ /* optional cooling device */ -+ struct thermal_cooling_device *cdev; - }; - - /* helper to grab and cache data, at most one time per second */ -@@ -367,36 +371,30 @@ static ssize_t pwm_mode_store(struct dev - static const int tc654_pwm_map[16] = { 77, 88, 102, 112, 124, 136, 148, 160, - 172, 184, 196, 207, 219, 231, 243, 255}; - -+static int get_pwm(struct tc654_data *data) -+{ -+ if (data->config & TC654_REG_CONFIG_SDM) -+ return 0; -+ else -+ return tc654_pwm_map[data->duty_cycle]; -+} -+ - static ssize_t pwm_show(struct device *dev, struct device_attribute *da, - char *buf) - { - struct tc654_data *data = tc654_update_client(dev); -- int pwm; - - if (IS_ERR(data)) - return PTR_ERR(data); - -- if (data->config & TC654_REG_CONFIG_SDM) -- pwm = 0; -- else -- pwm = tc654_pwm_map[data->duty_cycle]; -- -- return sprintf(buf, "%d\n", pwm); -+ return sprintf(buf, "%d\n", get_pwm(data)); +@@ -384,28 +385,20 @@ static ssize_t pwm_show(struct device *d + return sprintf(buf, "%d\n", pwm); } -static ssize_t pwm_store(struct device *dev, struct device_attribute *da, @@ -77,8 +45,22 @@ Signed-off-by: Christian Lamparter <chunkeey@gmail.com> - mutex_lock(&data->update_lock); - if (val == 0) -@@ -416,6 +414,22 @@ static ssize_t pwm_store(struct device * +- if (val == 0) ++ if (val == 0) { + data->config |= TC654_REG_CONFIG_SDM; +- else ++ data->duty_cycle = 0; ++ } else { + data->config &= ~TC654_REG_CONFIG_SDM; +- +- data->duty_cycle = find_closest(val, tc654_pwm_map, +- ARRAY_SIZE(tc654_pwm_map)); ++ data->duty_cycle = val - 1; ++ } + + ret = i2c_smbus_write_byte_data(client, TC654_REG_CONFIG, data->config); + if (ret < 0) +@@ -416,6 +409,24 @@ static ssize_t pwm_store(struct device * out: mutex_unlock(&data->update_lock); @@ -86,7 +68,7 @@ Signed-off-by: Christian Lamparter <chunkeey@gmail.com> +} + +static ssize_t pwm_store(struct device *dev, struct device_attribute *da, -+ const char *buf, size_t count) ++ const char *buf, size_t count) +{ + struct tc654_data *data = dev_get_drvdata(dev); + unsigned long val; @@ -96,48 +78,60 @@ Signed-off-by: Christian Lamparter <chunkeey@gmail.com> + return -EINVAL; + if (val > 255) + return -EINVAL; ++ if (val > 0) ++ val = find_closest(val, tc654_pwm_map, ARRAY_SIZE(tc654_pwm_map)) + 1; + + ret = _set_pwm(data, val); return ret < 0 ? ret : count; } -@@ -447,6 +461,47 @@ static struct attribute *tc654_attrs[] = - +@@ -448,6 +459,58 @@ static struct attribute *tc654_attrs[] = ATTRIBUTE_GROUPS(tc654); -+/* cooling device */ -+ -+static int tc654_get_max_state(struct thermal_cooling_device *cdev, -+ unsigned long *state) + /* ++ * thermal cooling device functions ++ * ++ * Account for the "ShutDown Mode (SDM)" state by offsetting ++ * the 16 PWM duty cycle states by 1. ++ * ++ * State 0 = 0% PWM | Shutdown - Fan(s) are off ++ * State 1 = 30% PWM | duty_cycle = 0 ++ * State 2 = ~35% PWM | duty_cycle = 1 ++ * [...] ++ * State 15 = ~95% PWM | duty_cycle = 14 ++ * State 16 = 100% PWM | duty_cycle = 15 ++ */ ++#define TC654_MAX_COOLING_STATE 16 ++ ++static int tc654_get_max_state(struct thermal_cooling_device *cdev, unsigned long *state) +{ -+ *state = 255; ++ *state = TC654_MAX_COOLING_STATE; + return 0; +} + -+static int tc654_get_cur_state(struct thermal_cooling_device *cdev, -+ unsigned long *state) ++static int tc654_get_cur_state(struct thermal_cooling_device *cdev, unsigned long *state) +{ + struct tc654_data *data = tc654_update_client(cdev->devdata); + + if (IS_ERR(data)) + return PTR_ERR(data); + -+ *state = get_pwm(data); ++ if (data->config & TC654_REG_CONFIG_SDM) ++ *state = 0; /* FAN is off */ ++ else ++ *state = data->duty_cycle + 1; /* offset PWM States by 1 */ ++ + return 0; +} + -+static int tc654_set_cur_state(struct thermal_cooling_device *cdev, -+ unsigned long state) ++static int tc654_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) +{ + struct tc654_data *data = tc654_update_client(cdev->devdata); + + if (IS_ERR(data)) + return PTR_ERR(data); + -+ if (state > 255) -+ return -EINVAL; -+ -+ return _set_pwm(data, state); ++ return _set_pwm(data, clamp_val(state, 0, TC654_MAX_COOLING_STATE)); +} + +static const struct thermal_cooling_device_ops tc654_fan_cool_ops = { @@ -146,10 +140,11 @@ Signed-off-by: Christian Lamparter <chunkeey@gmail.com> + .set_cur_state = tc654_set_cur_state, +}; + - /* ++/* * device probe and removal */ -@@ -477,7 +532,21 @@ static int tc654_probe(struct i2c_client + +@@ -477,7 +540,18 @@ static int tc654_probe(struct i2c_client hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, data, tc654_groups); @@ -157,18 +152,15 @@ Signed-off-by: Christian Lamparter <chunkeey@gmail.com> + if (IS_ERR(hwmon_dev)) + return PTR_ERR(hwmon_dev); + -+#if IS_ENABLED(CONFIG_OF) -+ /* Optional cooling device register for Device tree platforms */ -+ data->cdev = thermal_of_cooling_device_register(client->dev.of_node, -+ "tc654", hwmon_dev, -+ &tc654_fan_cool_ops); -+#else /* CONFIG_OF */ -+ /* Optional cooling device register for non Device tree platforms */ -+ data->cdev = thermal_cooling_device_register("tc654", hwmon_dev, -+ &tc654_fan_cool_ops); -+#endif /* CONFIG_OF */ -+ -+ return PTR_ERR_OR_ZERO(data->cdev); ++ if (IS_ENABLED(CONFIG_THERMAL)) { ++ struct thermal_cooling_device *cdev; ++ ++ cdev = devm_thermal_of_cooling_device_register(dev, dev->of_node, client->name, ++ hwmon_dev, &tc654_fan_cool_ops); ++ return PTR_ERR_OR_ZERO(cdev); ++ } ++ ++ return 0; } static const struct i2c_device_id tc654_id[] = { |