target/linux/apm821xx/patches-4.4/912-hwmon-lm90-expose-to-thermal-fw-via-DT.patch

   1 From: Wei Ni <wni@nvidia.com>
   2 Subject: hwmon: lm90: expose to thermal fw via DT nodes
   3
   4 This patch adds to lm90 temperature sensor the possibility
   5 to expose itself as thermal zone device, registered on the
   6 thermal framework.
   7
   8 The thermal zone is built only if a device tree node
   9 describing a thermal zone for this sensor is present
  10 inside the lm90 DT node. Otherwise, the driver behavior
  11 will be the same.
  12
  13 Discussed in:
  14 http://www.gossamer-threads.com/lists/linux/kernel/1992853
  15
  16 BUG=chrome-os-partner:30834
  17 TEST=Verified. Build and boot up system.
  18
  19 Signed-off-by: Wei Ni <wni@nvidia.com>
  20 Reviewed-on: https://chromium-review.googlesource.com/181447
  21 Reviewed-by: Dylan Reid <dgreid@chromium.org>
  22 Tested-by: Dylan Reid <dgreid@chromium.org>
  23 Commit-Queue: Dylan Reid <dgreid@chromium.org>
  24 Change-Id: Id356b94d7e8f4b49ec15e46b17a1fa2ff0cbf8cf
  25 Reviewed-on: https://chromium-review.googlesource.com/212414
  26 Tested-by: Wei Ni <wni.nvidia@gmail.com>
  27 Reviewed-by: Olof Johansson <olofj@chromium.org>
  28 Commit-Queue: Olof Johansson <olofj@chromium.org>
  29 ---
  30 --- a/drivers/hwmon/lm90.c
  31 +++ b/drivers/hwmon/lm90.c
  32 @@ -96,6 +96,8 @@
  33  #include <linux/sysfs.h>
  34  #include <linux/interrupt.h>
  35  #include <linux/regulator/consumer.h>
  36 +#include <linux/of.h>
  37 +#include <linux/thermal.h>
  38
  39  /*
  40   * Addresses to scan
  41 @@ -119,6 +121,13 @@ static const unsigned short normal_i2c[]
  42  enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
  43         max6646, w83l771, max6696, sa56004, g781, tmp451 };
  44
  45 +enum sensor_id {
  46 +       LOCAL = 0,
  47 +       REMOTE,
  48 +       REMOTE2,
  49 +       SENSOR_ID_END,
  50 +};
  51 +
  52  /*
  53   * The LM90 registers
  54   */
  55 @@ -368,6 +377,7 @@ struct lm90_data {
  56         struct i2c_client *client;
  57         struct device *hwmon_dev;
  58         const struct attribute_group *groups[6];
  59 +       struct thermal_zone_device *tz[SENSOR_ID_END];
  60         struct mutex update_lock;
  61         struct regulator *regulator;
  62         char valid; /* zero until following fields are valid */
  63 @@ -880,6 +890,24 @@ static ssize_t show_temp11(struct device
  64         return sprintf(buf, "%d\n", read_temp11(dev, attr->index));
  65  }
  66
  67 +static int lm90_read_local_temp(void *dev, int *temp)
  68 +{
  69 +       *temp = read_temp11(dev, 4);
  70 +       return 0;
  71 +}
  72 +
  73 +static int lm90_read_remote_temp(void *dev, int *temp)
  74 +{
  75 +       *temp = read_temp11(dev, 0);
  76 +       return 0;
  77 +}
  78 +
  79 +static int lm90_read_remote2_temp(void *dev, int *temp)
  80 +{
  81 +       *temp = read_temp11(dev, 5);
  82 +       return 0;
  83 +}
  84 +
  85  static int write_temp11(struct device *dev, int nr, int index, long val)
  86  {
  87         struct {
  88 @@ -1210,6 +1238,18 @@ static const struct attribute_group lm90
  89         .attrs = lm90_temp3_attributes,
  90  };
  91
  92 +static const struct thermal_zone_of_device_ops local_temp_sensor = {
  93 +       .get_temp = lm90_read_local_temp,
  94 +};
  95 +
  96 +static const struct thermal_zone_of_device_ops remote_temp_sensor = {
  97 +       .get_temp = lm90_read_remote_temp,
  98 +};
  99 +
 100 +static const struct thermal_zone_of_device_ops remote2_temp_sensor = {
 101 +       .get_temp = lm90_read_remote2_temp,
 102 +};
 103 +
 104  /* pec used for ADM1032 only */
 105  static ssize_t show_pec(struct device *dev, struct device_attribute *dummy,
 106                         char *buf)
 107 @@ -1659,6 +1699,30 @@ static int lm90_probe(struct i2c_client
 108                 }
 109         }
 110
 111 +       data->tz[LOCAL] = thermal_zone_of_sensor_register(&client->dev,
 112 +                                                       LOCAL,
 113 +                                                       &client->dev,
 114 +                                                       &local_temp_sensor);
 115 +       if (IS_ERR(data->tz[LOCAL]))
 116 +               data->tz[LOCAL] = NULL;
 117 +
 118 +       data->tz[REMOTE] = thermal_zone_of_sensor_register(&client->dev,
 119 +                                                       REMOTE,
 120 +                                                       &client->dev,
 121 +                                                       &remote_temp_sensor);
 122 +       if (IS_ERR(data->tz[REMOTE]))
 123 +               data->tz[REMOTE] = NULL;
 124 +
 125 +       if (data->flags & LM90_HAVE_TEMP3) {
 126 +               data->tz[REMOTE2] = thermal_zone_of_sensor_register(
 127 +                                                       &client->dev,
 128 +                                                       REMOTE2,
 129 +                                                       &client->dev,
 130 +                                                       &remote2_temp_sensor);
 131 +               if (IS_ERR(data->tz[REMOTE2]))
 132 +                       data->tz[REMOTE2] = NULL;
 133 +       }
 134 +
 135         return 0;
 136
 137  exit_unregister:
 138 @@ -1674,8 +1738,11 @@ exit_restore:
 139
 140  static int lm90_remove(struct i2c_client *client)
 141  {
 142 +       int i;
 143         struct lm90_data *data = i2c_get_clientdata(client);
 144
 145 +       for (i = 0; i < SENSOR_ID_END; i++)
 146 +               thermal_zone_of_sensor_unregister(&client->dev, data->tz[i]);
 147         hwmon_device_unregister(data->hwmon_dev);
 148         device_remove_file(&client->dev, &dev_attr_pec);
 149         lm90_restore_conf(client, data);