71 lines
2.0 KiB
Diff
71 lines
2.0 KiB
Diff
From: Daniel González Cabanelas <dgcbueu@gmail.com>
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Subject: [PATCH 2/2] rtc: rs5c372: let the alarm to be used as wakeup source
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Currently there is no use for the interrupts on the rs5c372 RTC and the
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wakealarm isn't enabled. There are some devices like NASes which use this
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RTC to wake up from the power off state when the INTR pin is activated by
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the alarm clock.
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Enable the alarm and let to be used as a wakeup source.
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Tested on a Buffalo LS421DE NAS.
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Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>
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---
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drivers/rtc/rtc-rs5c372.c | 16 ++++++++++++++++
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1 file changed, 16 insertions(+)
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--- a/drivers/rtc/rtc-rs5c372.c
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+++ b/drivers/rtc/rtc-rs5c372.c
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@@ -654,6 +654,7 @@ static int rs5c372_probe(struct i2c_clie
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int err = 0;
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int smbus_mode = 0;
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struct rs5c372 *rs5c372;
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+ bool rs5c372_can_wakeup_device = false;
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dev_dbg(&client->dev, "%s\n", __func__);
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@@ -689,6 +690,12 @@ static int rs5c372_probe(struct i2c_clie
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else
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rs5c372->type = id->driver_data;
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+#ifdef CONFIG_OF
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+ if(of_property_read_bool(client->dev.of_node,
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+ "wakeup-source"))
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+ rs5c372_can_wakeup_device = true;
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+#endif
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+
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/* we read registers 0x0f then 0x00-0x0f; skip the first one */
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rs5c372->regs = &rs5c372->buf[1];
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rs5c372->smbus = smbus_mode;
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@@ -722,6 +729,8 @@ static int rs5c372_probe(struct i2c_clie
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goto exit;
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}
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+ rs5c372->has_irq = 1;
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+
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/* if the oscillator lost power and no other software (like
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* the bootloader) set it up, do it here.
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*
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@@ -748,6 +757,10 @@ static int rs5c372_probe(struct i2c_clie
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);
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/* REVISIT use client->irq to register alarm irq ... */
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+ if (rs5c372_can_wakeup_device) {
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+ device_init_wakeup(&client->dev, true);
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+ }
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+
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rs5c372->rtc = devm_rtc_device_register(&client->dev,
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rs5c372_driver.driver.name,
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&rs5c372_rtc_ops, THIS_MODULE);
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@@ -761,6 +774,9 @@ static int rs5c372_probe(struct i2c_clie
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if (err)
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goto exit;
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+ /* the rs5c372 alarm only supports a minute accuracy */
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+ rs5c372->rtc->uie_unsupported = 1;
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+
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return 0;
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exit:
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