target/linux/generic/pending-5.4/191-rtc-rs5c372-let_the_alarm_to_be_used_as_wakeup_source.patch

   1 From: Daniel González Cabanelas <dgcbueu@gmail.com>
   2 Subject: [PATCH 2/2] rtc: rs5c372: let the alarm to be used as wakeup source
   3
   4 Currently there is no use for the interrupts on the rs5c372 RTC and the
   5 wakealarm isn't enabled. There are some devices like NASes which use this
   6 RTC to wake up from the power off state when the INTR pin is activated by
   7 the alarm clock.
   8
   9 Enable the alarm and let to be used as a wakeup source.
  10
  11 Tested on a Buffalo LS421DE NAS.
  12
  13 Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>
  14 ---
  15  drivers/rtc/rtc-rs5c372.c | 16 ++++++++++++++++
  16  1 file changed, 16 insertions(+)
  17
  18 diff --git a/drivers/rtc/rtc-rs5c372.c b/drivers/rtc/rtc-rs5c372.c
  19 index 94b778c6e..76775d66e 100644
  20 --- a/drivers/rtc/rtc-rs5c372.c
  21 +++ b/drivers/rtc/rtc-rs5c372.c
  22 @@ -654,6 +654,7 @@ static int rs5c372_probe(struct i2c_client *client,
  23         int err = 0;
  24         int smbus_mode = 0;
  25         struct rs5c372 *rs5c372;
  26 +       bool rs5c372_can_wakeup_device = false;
  27
  28         dev_dbg(&client->dev, "%s\n", __func__);
  29
  30 @@ -689,6 +690,12 @@ static int rs5c372_probe(struct i2c_client *client,
  31         else
  32                 rs5c372->type = id->driver_data;
  33
  34 +#ifdef CONFIG_OF
  35 +       if(of_property_read_bool(client->dev.of_node,
  36 +                                             "wakeup-source"))
  37 +               rs5c372_can_wakeup_device = true;
  38 +#endif
  39 +
  40         /* we read registers 0x0f then 0x00-0x0f; skip the first one */
  41         rs5c372->regs = &rs5c372->buf[1];
  42         rs5c372->smbus = smbus_mode;
  43 @@ -722,6 +729,8 @@ static int rs5c372_probe(struct i2c_client *client,
  44                 goto exit;
  45         }
  46
  47 +       rs5c372->has_irq = 1;
  48 +
  49         /* if the oscillator lost power and no other software (like
  50          * the bootloader) set it up, do it here.
  51          *
  52 @@ -748,6 +757,10 @@ static int rs5c372_probe(struct i2c_client *client,
  53                         );
  54
  55         /* REVISIT use client->irq to register alarm irq ... */
  56 +       if (rs5c372_can_wakeup_device) {
  57 +               device_init_wakeup(&client->dev, true);
  58 +       }
  59 +
  60         rs5c372->rtc = devm_rtc_device_register(&client->dev,
  61                                         rs5c372_driver.driver.name,
  62                                         &rs5c372_rtc_ops, THIS_MODULE);
  63 @@ -761,6 +774,9 @@ static int rs5c372_probe(struct i2c_client *client,
  64         if (err)
  65                 goto exit;
  66
  67 +       /* the rs5c372 alarm only supports a minute accuracy */
  68 +       rs5c372->rtc->uie_unsupported = 1;
  69 +
  70         return 0;
  71
  72  exit: