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175 lines
4.5 KiB
Diff
175 lines
4.5 KiB
Diff
From 15ae701189744d321d3a1264ff46f8871e8765ee Mon Sep 17 00:00:00 2001
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From: Christian Lamparter <chunkeey@gmail.com>
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Date: Sun, 17 Dec 2017 17:29:13 +0100
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Subject: [PATCH] hwmon: tc654: add thermal_cooling device
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This patch adds a thermaL_cooling device to the tc654 driver.
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This allows the chip to be used for DT-based cooling.
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Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
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---
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drivers/hwmon/tc654.c | 103 +++++++++++++++++++++++++++++++++++++++++---------
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1 file changed, 86 insertions(+), 17 deletions(-)
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--- a/drivers/hwmon/tc654.c
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+++ b/drivers/hwmon/tc654.c
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@@ -24,6 +24,7 @@
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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+#include <linux/thermal.h>
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#include <linux/util_macros.h>
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enum tc654_regs {
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@@ -141,6 +142,9 @@ struct tc654_data {
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* writable register used to control the duty
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* cycle of the V OUT output.
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*/
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+
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+ /* optional cooling device */
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+ struct thermal_cooling_device *cdev;
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};
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/* helper to grab and cache data, at most one time per second */
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@@ -376,36 +380,30 @@ static ssize_t set_pwm_mode(struct devic
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static const int tc654_pwm_map[16] = { 77, 88, 102, 112, 124, 136, 148, 160,
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172, 184, 196, 207, 219, 231, 243, 255};
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+static int get_pwm(struct tc654_data *data)
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+{
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+ if (data->config & TC654_REG_CONFIG_SDM)
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+ return 0;
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+ else
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+ return tc654_pwm_map[data->duty_cycle];
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+}
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+
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static ssize_t show_pwm(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct tc654_data *data = tc654_update_client(dev);
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- int pwm;
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if (IS_ERR(data))
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return PTR_ERR(data);
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- if (data->config & TC654_REG_CONFIG_SDM)
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- pwm = 0;
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- else
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- pwm = tc654_pwm_map[data->duty_cycle];
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-
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- return sprintf(buf, "%d\n", pwm);
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+ return sprintf(buf, "%d\n", get_pwm(data));
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}
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-static ssize_t set_pwm(struct device *dev, struct device_attribute *da,
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- const char *buf, size_t count)
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+static int _set_pwm(struct tc654_data *data, unsigned long val)
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{
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- struct tc654_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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- unsigned long val;
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int ret;
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- if (kstrtoul(buf, 10, &val))
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- return -EINVAL;
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- if (val > 255)
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- return -EINVAL;
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-
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mutex_lock(&data->update_lock);
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if (val == 0)
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@@ -425,6 +423,22 @@ static ssize_t set_pwm(struct device *de
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out:
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mutex_unlock(&data->update_lock);
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+ return ret;
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+}
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+
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+static ssize_t set_pwm(struct device *dev, struct device_attribute *da,
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+ const char *buf, size_t count)
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+{
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+ struct tc654_data *data = dev_get_drvdata(dev);
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+ unsigned long val;
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+ int ret;
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+
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+ if (kstrtoul(buf, 10, &val))
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+ return -EINVAL;
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+ if (val > 255)
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+ return -EINVAL;
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+
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+ ret = _set_pwm(data, val);
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return ret < 0 ? ret : count;
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}
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@@ -462,6 +476,47 @@ static struct attribute *tc654_attrs[] =
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ATTRIBUTE_GROUPS(tc654);
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+/* cooling device */
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+
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+static int tc654_get_max_state(struct thermal_cooling_device *cdev,
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+ unsigned long *state)
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+{
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+ *state = 255;
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+ return 0;
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+}
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+
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+static int tc654_get_cur_state(struct thermal_cooling_device *cdev,
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+ unsigned long *state)
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+{
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+ struct tc654_data *data = tc654_update_client(cdev->devdata);
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+
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+ if (IS_ERR(data))
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+ return PTR_ERR(data);
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+
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+ *state = get_pwm(data);
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+ return 0;
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+}
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+
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+static int tc654_set_cur_state(struct thermal_cooling_device *cdev,
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+ unsigned long state)
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+{
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+ struct tc654_data *data = tc654_update_client(cdev->devdata);
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+
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+ if (IS_ERR(data))
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+ return PTR_ERR(data);
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+
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+ if (state > 255)
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+ return -EINVAL;
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+
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+ return _set_pwm(data, state);
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+}
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+
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+static const struct thermal_cooling_device_ops tc654_fan_cool_ops = {
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+ .get_max_state = tc654_get_max_state,
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+ .get_cur_state = tc654_get_cur_state,
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+ .set_cur_state = tc654_set_cur_state,
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+};
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+
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/*
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* device probe and removal
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*/
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@@ -493,7 +548,21 @@ static int tc654_probe(struct i2c_client
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hwmon_dev =
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devm_hwmon_device_register_with_groups(dev, client->name, data,
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tc654_groups);
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- return PTR_ERR_OR_ZERO(hwmon_dev);
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+ if (IS_ERR(hwmon_dev))
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+ return PTR_ERR(hwmon_dev);
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+
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+#if IS_ENABLED(CONFIG_OF)
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+ /* Optional cooling device register for Device tree platforms */
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+ data->cdev = thermal_of_cooling_device_register(client->dev.of_node,
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+ "tc654", hwmon_dev,
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+ &tc654_fan_cool_ops);
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+#else /* CONFIG_OF */
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+ /* Optional cooling device register for non Device tree platforms */
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+ data->cdev = thermal_cooling_device_register("tc654", hwmon_dev,
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+ &tc654_fan_cool_ops);
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+#endif /* CONFIG_OF */
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+
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+ return PTR_ERR_OR_ZERO(data->cdev);
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}
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static const struct i2c_device_id tc654_id[] = {
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