-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 @@
#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,
-
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);
+}
+
+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;
+ 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 = {
+ .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);
+ 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[] = {
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