OpenWrt – Rev 4
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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[] = {