diff options
Diffstat (limited to 'target/linux/apm821xx/patches-4.14/804-hwmon-tc654-add-thermal_cooling-device.patch')
| -rw-r--r-- | target/linux/apm821xx/patches-4.14/804-hwmon-tc654-add-thermal_cooling-device.patch | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/target/linux/apm821xx/patches-4.14/804-hwmon-tc654-add-thermal_cooling-device.patch b/target/linux/apm821xx/patches-4.14/804-hwmon-tc654-add-thermal_cooling-device.patch new file mode 100644 index 0000000000..18ed8aecce --- /dev/null +++ b/target/linux/apm821xx/patches-4.14/804-hwmon-tc654-add-thermal_cooling-device.patch @@ -0,0 +1,174 @@ +From 15ae701189744d321d3a1264ff46f8871e8765ee 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 + +This patch adds a thermaL_cooling device to the tc654 driver. +This allows the chip to be used for DT-based cooling. + +Signed-off-by: Christian Lamparter <chunkeey@gmail.com> +--- + drivers/hwmon/tc654.c | 103 +++++++++++++++++++++++++++++++++++++++++--------- + 1 file changed, 86 insertions(+), 17 deletions(-) + +--- a/drivers/hwmon/tc654.c ++++ b/drivers/hwmon/tc654.c +@@ -24,6 +24,7 @@ + #include <linux/module.h> + #include <linux/mutex.h> + #include <linux/slab.h> ++#include <linux/thermal.h> + #include <linux/util_macros.h> + + enum tc654_regs { +@@ -141,6 +142,9 @@ 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 */ +@@ -376,36 +380,30 @@ static ssize_t set_pwm_mode(struct devic + 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 show_pwm(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)); + } + +-static ssize_t set_pwm(struct device *dev, struct device_attribute *da, +- const char *buf, size_t count) ++static int _set_pwm(struct tc654_data *data, unsigned long val) + { +- struct tc654_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; +- unsigned long val; + int ret; + +- if (kstrtoul(buf, 10, &val)) +- return -EINVAL; +- if (val > 255) +- return -EINVAL; +- + mutex_lock(&data->update_lock); + + if (val == 0) +@@ -425,6 +423,22 @@ static ssize_t set_pwm(struct device *de + + out: + mutex_unlock(&data->update_lock); ++ return ret; ++} ++ ++static ssize_t set_pwm(struct device *dev, struct device_attribute *da, ++ const char *buf, size_t count) ++{ ++ struct tc654_data *data = dev_get_drvdata(dev); ++ unsigned long val; ++ int ret; ++ ++ if (kstrtoul(buf, 10, &val)) ++ return -EINVAL; ++ if (val > 255) ++ return -EINVAL; ++ ++ ret = _set_pwm(data, val); + return ret < 0 ? ret : count; + } + +@@ -462,6 +476,47 @@ static struct attribute *tc654_attrs[] = + + ATTRIBUTE_GROUPS(tc654); + ++/* cooling device */ ++ ++static int tc654_get_max_state(struct thermal_cooling_device *cdev, ++ unsigned long *state) ++{ ++ *state = 255; ++ return 0; ++} ++ ++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); ++ return 0; ++} ++ ++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); ++} ++ ++static const struct thermal_cooling_device_ops tc654_fan_cool_ops = { ++ .get_max_state = tc654_get_max_state, ++ .get_cur_state = tc654_get_cur_state, ++ .set_cur_state = tc654_set_cur_state, ++}; ++ + /* + * device probe and removal + */ +@@ -493,7 +548,21 @@ static int tc654_probe(struct i2c_client + hwmon_dev = + devm_hwmon_device_register_with_groups(dev, client->name, data, + tc654_groups); +- return PTR_ERR_OR_ZERO(hwmon_dev); ++ 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); + } + + static const struct i2c_device_id tc654_id[] = { |