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 diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
  31 index fb9e224..c54d3c8 100644
  32 --- a/drivers/hwmon/lm90.c
  33 +++ b/drivers/hwmon/lm90.c
  34 @@ -96,6 +96,8 @@
  35  #include <linux/sysfs.h>
  36  #include <linux/interrupt.h>
  37  #include <linux/regulator/consumer.h>
  38 +#include <linux/of.h>
  39 +#include <linux/thermal.h>
  40
  41  /*
  42   * Addresses to scan
  43 @@ -118,6 +120,13 @@
  44
  45  enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
  46         max6646, w83l771, max6696, sa56004, g781, tmp451 };
  47 +
  48 +enum sensor_id {
  49 +       LOCAL = 0,
  50 +       REMOTE,
  51 +       REMOTE2,
  52 +       SENSOR_ID_END,
  53 +};
  54
  55  /*
  56   * The LM90 registers
  57 @@ -368,6 +377,7 @@
  58         struct i2c_client *client;
  59         struct device *hwmon_dev;
  60         const struct attribute_group *groups[6];
  61 +       struct thermal_zone_device *tz[SENSOR_ID_END];
  62         struct mutex update_lock;
  63         struct regulator *regulator;
  64         char valid; /* zero until following fields are valid */
  65 @@ -878,6 +888,24 @@
  66         struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
  67
  68         return sprintf(buf, "%d\n", read_temp11(dev, attr->index));
  69 +}
  70 +
  71 +static int lm90_read_local_temp(void *dev, int *temp)
  72 +{
  73 +       *temp = read_temp11(dev, 4);
  74 +       return 0;
  75 +}
  76 +
  77 +static int lm90_read_remote_temp(void *dev, int *temp)
  78 +{
  79 +       *temp = read_temp11(dev, 0);
  80 +       return 0;
  81 +}
  82 +
  83 +static int lm90_read_remote2_temp(void *dev, int *temp)
  84 +{
  85 +       *temp = read_temp11(dev, 5);
  86 +       return 0;
  87  }
  88
  89  static int write_temp11(struct device *dev, int nr, int index, long val)
  90 @@ -1150,6 +1238,18 @@
  91         .attrs = lm90_temp3_attributes,
  92  };
  93
  94 +static const struct thermal_zone_of_device_ops local_temp_sensor = {
  95 +       .get_temp = lm90_read_local_temp,
  96 +};
  97 +
  98 +static const struct thermal_zone_of_device_ops remote_temp_sensor = {
  99 +       .get_temp = lm90_read_remote_temp,
 100 +};
 101 +
 102 +static const struct thermal_zone_of_device_ops remote2_temp_sensor = {
 103 +       .get_temp = lm90_read_remote2_temp,
 104 +};
 105 +
 106  /* pec used for ADM1032 only */
 107  static ssize_t show_pec(struct device *dev, struct device_attribute *dummy,
 108                         char *buf)
 109 @@ -1599,6 +1699,30 @@
 110                 }
 111         }
 112
 113 +       data->tz[LOCAL] = thermal_zone_of_sensor_register(&client->dev,
 114 +                                                       LOCAL,
 115 +                                                       &client->dev,
 116 +                                                       &local_temp_sensor);
 117 +       if (IS_ERR(data->tz[LOCAL]))
 118 +               data->tz[LOCAL] = NULL;
 119 +
 120 +       data->tz[REMOTE] = thermal_zone_of_sensor_register(&client->dev,
 121 +                                                       REMOTE,
 122 +                                                       &client->dev,
 123 +                                                       &remote_temp_sensor);
 124 +       if (IS_ERR(data->tz[REMOTE]))
 125 +               data->tz[REMOTE] = NULL;
 126 +
 127 +       if (data->flags & LM90_HAVE_TEMP3) {
 128 +               data->tz[REMOTE2] = thermal_zone_of_sensor_register(
 129 +                                                       &client->dev,
 130 +                                                       REMOTE2,
 131 +                                                       &client->dev,
 132 +                                                       &remote2_temp_sensor);
 133 +               if (IS_ERR(data->tz[REMOTE2]))
 134 +                       data->tz[REMOTE2] = NULL;
 135 +       }
 136 +
 137         return 0;
 138
 139  exit_unregister:
 140 @@ -1674,8 +1726,11 @@
 141
 142  static int lm90_remove(struct i2c_client *client)
 143  {
 144 +       int i;
 145         struct lm90_data *data = i2c_get_clientdata(client);
 146
 147 +       for (i = 0; i < SENSOR_ID_END; i++)
 148 +               thermal_zone_of_sensor_unregister(&client->dev, data->tz[i]);
 149         hwmon_device_unregister(data->hwmon_dev);
 150         device_remove_file(&client->dev, &dev_attr_pec);
 151         lm90_restore_conf(client, data);