target/linux/apm821xx/patches-5.4/804-hwmon-tc654-add-thermal_cooling-device.patch

   1 From 9cb27801b5cbad2e1aaf45aac428cb2fac5e1372 Mon Sep 17 00:00:00 2001
   2 From: Christian Lamparter <chunkeey@gmail.com>
   3 Date: Sun, 17 Dec 2017 17:29:13 +0100
   4 Subject: [PATCH] hwmon: tc654: add thermal_cooling device
   5
   6 This patch adds a thermaL_cooling device to the tc654 driver.
   7 This allows the chip to be used for DT-based cooling.
   8
   9 Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
  10 ---
  11  drivers/hwmon/tc654.c | 103 +++++++++++++++++++++++++++++++++++-------
  12  1 file changed, 86 insertions(+), 17 deletions(-)
  13
  14 --- a/drivers/hwmon/tc654.c
  15 +++ b/drivers/hwmon/tc654.c
  16 @@ -15,6 +15,7 @@
  17  #include <linux/module.h>
  18  #include <linux/mutex.h>
  19  #include <linux/slab.h>
  20 +#include <linux/thermal.h>
  21  #include <linux/util_macros.h>
  22
  23  enum tc654_regs {
  24 @@ -132,6 +133,9 @@ struct tc654_data {
  25                          * writable register used to control the duty
  26                          * cycle of the V OUT output.
  27                          */
  28 +
  29 +       /* optional cooling device */
  30 +       struct thermal_cooling_device *cdev;
  31  };
  32
  33  /* helper to grab and cache data, at most one time per second */
  34 @@ -367,36 +371,30 @@ static ssize_t pwm_mode_store(struct dev
  35  static const int tc654_pwm_map[16] = { 77,  88, 102, 112, 124, 136, 148, 160,
  36                                       172, 184, 196, 207, 219, 231, 243, 255};
  37
  38 +static int get_pwm(struct tc654_data *data)
  39 +{
  40 +       if (data->config & TC654_REG_CONFIG_SDM)
  41 +               return 0;
  42 +       else
  43 +               return tc654_pwm_map[data->duty_cycle];
  44 +}
  45 +
  46  static ssize_t pwm_show(struct device *dev, struct device_attribute *da,
  47                         char *buf)
  48  {
  49         struct tc654_data *data = tc654_update_client(dev);
  50 -       int pwm;
  51
  52         if (IS_ERR(data))
  53                 return PTR_ERR(data);
  54
  55 -       if (data->config & TC654_REG_CONFIG_SDM)
  56 -               pwm = 0;
  57 -       else
  58 -               pwm = tc654_pwm_map[data->duty_cycle];
  59 -
  60 -       return sprintf(buf, "%d\n", pwm);
  61 +       return sprintf(buf, "%d\n", get_pwm(data));
  62  }
  63
  64 -static ssize_t pwm_store(struct device *dev, struct device_attribute *da,
  65 -                        const char *buf, size_t count)
  66 +static int _set_pwm(struct tc654_data *data, unsigned long val)
  67  {
  68 -       struct tc654_data *data = dev_get_drvdata(dev);
  69         struct i2c_client *client = data->client;
  70 -       unsigned long val;
  71         int ret;
  72
  73 -       if (kstrtoul(buf, 10, &val))
  74 -               return -EINVAL;
  75 -       if (val > 255)
  76 -               return -EINVAL;
  77 -
  78         mutex_lock(&data->update_lock);
  79
  80         if (val == 0)
  81 @@ -416,6 +414,22 @@ static ssize_t pwm_store(struct device *
  82
  83  out:
  84         mutex_unlock(&data->update_lock);
  85 +       return ret;
  86 +}
  87 +
  88 +static ssize_t pwm_store(struct device *dev, struct device_attribute *da,
  89 +                      const char *buf, size_t count)
  90 +{
  91 +       struct tc654_data *data = dev_get_drvdata(dev);
  92 +       unsigned long val;
  93 +       int ret;
  94 +
  95 +       if (kstrtoul(buf, 10, &val))
  96 +               return -EINVAL;
  97 +       if (val > 255)
  98 +               return -EINVAL;
  99 +
 100 +       ret = _set_pwm(data, val);
 101         return ret < 0 ? ret : count;
 102  }
 103
 104 @@ -447,6 +461,47 @@ static struct attribute *tc654_attrs[] =
 105
 106  ATTRIBUTE_GROUPS(tc654);
 107
 108 +/* cooling device */
 109 +
 110 +static int tc654_get_max_state(struct thermal_cooling_device *cdev,
 111 +                              unsigned long *state)
 112 +{
 113 +       *state = 255;
 114 +       return 0;
 115 +}
 116 +
 117 +static int tc654_get_cur_state(struct thermal_cooling_device *cdev,
 118 +                              unsigned long *state)
 119 +{
 120 +       struct tc654_data *data = tc654_update_client(cdev->devdata);
 121 +
 122 +       if (IS_ERR(data))
 123 +               return PTR_ERR(data);
 124 +
 125 +       *state = get_pwm(data);
 126 +       return 0;
 127 +}
 128 +
 129 +static int tc654_set_cur_state(struct thermal_cooling_device *cdev,
 130 +                              unsigned long state)
 131 +{
 132 +       struct tc654_data *data = tc654_update_client(cdev->devdata);
 133 +
 134 +       if (IS_ERR(data))
 135 +               return PTR_ERR(data);
 136 +
 137 +       if (state > 255)
 138 +               return -EINVAL;
 139 +
 140 +       return _set_pwm(data, state);
 141 +}
 142 +
 143 +static const struct thermal_cooling_device_ops tc654_fan_cool_ops = {
 144 +       .get_max_state = tc654_get_max_state,
 145 +       .get_cur_state = tc654_get_cur_state,
 146 +       .set_cur_state = tc654_set_cur_state,
 147 +};
 148 +
 149  /*
 150   * device probe and removal
 151   */
 152 @@ -478,7 +533,21 @@ static int tc654_probe(struct i2c_client
 153         hwmon_dev =
 154             devm_hwmon_device_register_with_groups(dev, client->name, data,
 155                                                    tc654_groups);
 156 -       return PTR_ERR_OR_ZERO(hwmon_dev);
 157 +       if (IS_ERR(hwmon_dev))
 158 +               return PTR_ERR(hwmon_dev);
 159 +
 160 +#if IS_ENABLED(CONFIG_OF)
 161 +       /* Optional cooling device register for Device tree platforms */
 162 +       data->cdev = thermal_of_cooling_device_register(client->dev.of_node,
 163 +                                                       "tc654", hwmon_dev,
 164 +                                                       &tc654_fan_cool_ops);
 165 +#else /* CONFIG_OF */
 166 +       /* Optional cooling device register for non Device tree platforms */
 167 +       data->cdev = thermal_cooling_device_register("tc654", hwmon_dev,
 168 +                                                    &tc654_fan_cool_ops);
 169 +#endif /* CONFIG_OF */
 170 +
 171 +       return PTR_ERR_OR_ZERO(data->cdev);
 172  }
 173
 174  static const struct i2c_device_id tc654_id[] = {