target/linux/brcm2708/patches-4.19/950-0147-firmware-raspberrypi-Add-backward-compatible-get_thr.patch

   1 From 4c26452ecee989e1f43a80654a0d5cd8ce64e49e Mon Sep 17 00:00:00 2001
   2 From: Stefan Wahren <stefan.wahren@i2se.com>
   3 Date: Sat, 13 Oct 2018 13:31:21 +0200
   4 Subject: [PATCH 147/806] firmware: raspberrypi: Add backward compatible
   5  get_throttled
   6
   7 Avoid a hard userspace ABI change by adding a compatible get_throttled
   8 sysfs entry. Its value is now feed by the GET_THROTTLED requests of the
   9 new hwmon driver. The first access to get_throttled will generate
  10 a warning.
  11
  12 Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
  13 ---
  14  drivers/firmware/raspberrypi.c | 33 +++++++++++++++++++++++++++++++++
  15  1 file changed, 33 insertions(+)
  16
  17 --- a/drivers/firmware/raspberrypi.c
  18 +++ b/drivers/firmware/raspberrypi.c
  19 @@ -30,6 +30,7 @@ struct rpi_firmware {
  20         struct mbox_chan *chan; /* The property channel. */
  21         struct completion c;
  22         u32 enabled;
  23 +       u32 get_throttled;
  24  };
  25
  26  static struct platform_device *g_pdev;
  27 @@ -172,6 +173,12 @@ int rpi_firmware_property(struct rpi_fir
  28
  29         kfree(data);
  30
  31 +       if ((tag == RPI_FIRMWARE_GET_THROTTLED) &&
  32 +            memcmp(&fw->get_throttled, tag_data, sizeof(fw->get_throttled))) {
  33 +               memcpy(&fw->get_throttled, tag_data, sizeof(fw->get_throttled));
  34 +               sysfs_notify(&fw->cl.dev->kobj, NULL, "get_throttled");
  35 +       }
  36 +
  37         return ret;
  38  }
  39  EXPORT_SYMBOL_GPL(rpi_firmware_property);
  40 @@ -196,6 +203,27 @@ static int rpi_firmware_notify_reboot(st
  41         return 0;
  42  }
  43
  44 +static ssize_t get_throttled_show(struct device *dev,
  45 +                                 struct device_attribute *attr, char *buf)
  46 +{
  47 +       struct rpi_firmware *fw = dev_get_drvdata(dev);
  48 +
  49 +       WARN_ONCE(1, "deprecated, use hwmon sysfs instead\n");
  50 +
  51 +       return sprintf(buf, "%x\n", fw->get_throttled);
  52 +}
  53 +
  54 +static DEVICE_ATTR_RO(get_throttled);
  55 +
  56 +static struct attribute *rpi_firmware_dev_attrs[] = {
  57 +       &dev_attr_get_throttled.attr,
  58 +       NULL,
  59 +};
  60 +
  61 +static const struct attribute_group rpi_firmware_dev_group = {
  62 +       .attrs = rpi_firmware_dev_attrs,
  63 +};
  64 +
  65  static void
  66  rpi_firmware_print_firmware_revision(struct rpi_firmware *fw)
  67  {
  68 @@ -228,6 +256,11 @@ rpi_register_hwmon_driver(struct device
  69
  70         rpi_hwmon = platform_device_register_data(dev, "raspberrypi-hwmon",
  71                                                   -1, NULL, 0);
  72 +
  73 +       if (!IS_ERR_OR_NULL(rpi_hwmon)) {
  74 +               if (devm_device_add_group(dev, &rpi_firmware_dev_group))
  75 +                       dev_err(dev, "Failed to create get_trottled attr\n");
  76 +       }
  77  }
  78
  79  static int rpi_firmware_probe(struct platform_device *pdev)