Messages in this thread Patch in this message | | | From | Nishanth Menon <> | Subject | [PATCH] drivers/rtc/rtc-ds1307.c: Support optional wakeup interrupt source | Date | Thu, 21 Aug 2014 11:12:01 -0500 |
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With the recent pinctrl-single changes, SoCs such as Texas Instrument's OMAP processors can treat wake-up events from deeper idle states as interrupts.
Let's add support for the optional second interrupt for wake-up events. And then SoC can wakeup and handle the event using it's regular handler.
Finally, to pass the wake-up interrupt in the dts file, interrupts-extended property needs to be passed.
This is similar in approach to commit 2a0b965cfb6e ("serial: omap: Add support for optional wake-up")
Signed-off-by: Nishanth Menon <nm@ti.com> --- drivers/rtc/rtc-ds1307.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+)
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c index f03d5ba..5feedfc 100644 --- a/drivers/rtc/rtc-ds1307.c +++ b/drivers/rtc/rtc-ds1307.c @@ -15,6 +15,8 @@ #include <linux/init.h> #include <linux/slab.h> #include <linux/i2c.h> +#include <linux/of_device.h> +#include <linux/of_irq.h> #include <linux/string.h> #include <linux/rtc.h> #include <linux/bcd.h> @@ -115,6 +117,7 @@ struct ds1307 { struct i2c_client *client; struct rtc_device *rtc; struct work_struct work; + int wakeirq; s32 (*read_block_data)(const struct i2c_client *client, u8 command, u8 length, u8 *values); s32 (*write_block_data)(const struct i2c_client *client, u8 command, @@ -835,6 +838,34 @@ ds1307_nvram_write(struct file *filp, struct kobject *kobj, /*----------------------------------------------------------------------*/ +static int ds1307_i2c_suspend(struct i2c_client *client, pm_message_t mesg) +{ + struct ds1307 *ds1307 = i2c_get_clientdata(client); + struct device *dev = &client->dev; + + if (!ds1307->wakeirq) + return 0; + + if (device_may_wakeup(dev)) + enable_irq(ds1307->wakeirq); + + return 0; +} + +static int ds1307_i2c_resume(struct i2c_client *client) +{ + struct ds1307 *ds1307 = i2c_get_clientdata(client); + struct device *dev = &client->dev; + + if (!ds1307->wakeirq) + return 0; + + if (device_may_wakeup(dev)) + disable_irq_nosync(ds1307->wakeirq); + + return 0; +} + static int ds1307_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -1116,6 +1147,8 @@ read_rtc: } if (want_irq) { + struct device_node *node = client->dev.of_node; + err = request_irq(client->irq, ds1307_irq, IRQF_SHARED, ds1307->rtc->name, client); if (err) { @@ -1125,6 +1158,28 @@ read_rtc: set_bit(HAS_ALARM, &ds1307->flags); dev_dbg(&client->dev, "got IRQ %d\n", client->irq); + if (node) + ds1307->wakeirq = irq_of_parse_and_map(node, 1); + + if (ds1307->wakeirq <= 0) + ds1307->wakeirq = 0; + else + err = devm_request_irq(&client->dev, + ds1307->wakeirq, + ds1307_irq, + IRQF_ONESHOT, + ds1307->rtc->name, + client); + if (err) { + dev_err(&client->dev, "unable to get wakeIRQ %d\n", + err); + free_irq(client->irq, client); + goto exit; + } + + /* We enable the interrupt only during suspend path */ + if (ds1307->wakeirq) + disable_irq_nosync(ds1307->wakeirq); } } @@ -1189,6 +1244,8 @@ static struct i2c_driver ds1307_driver = { }, .probe = ds1307_probe, .remove = ds1307_remove, + .suspend = ds1307_i2c_suspend, + .resume = ds1307_i2c_resume, .id_table = ds1307_id, }; -- 1.7.9.5
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