Messages in this thread Patch in this message | | | From | Nishanth Menon <> | Subject | [PATCH V2 4/5] drivers/rtc/rtc-ds1307.c: Support optional wakeup interrupt source | Date | Tue, 23 Jun 2015 11:15:13 -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 using the generic wakeirq support added in commit 4990d4fe327b ("PM / Wakeirq: Add automated device wake IRQ handling")
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") + ee83bd3b6483 ("serial: omap: Switch wake-up interrupt to generic wakeirq")
Signed-off-by: Nishanth Menon <nm@ti.com> --- Changes since V1: - dropped the need for specific suspend-resume handlers generic api has adequate hooks for those - little more code flow cleanups.
V1: https://patchwork.kernel.org/patch/4759171/
drivers/rtc/rtc-ds1307.c | 41 ++++++++++++++++++++++++++++++++++++++--- 1 file changed, 38 insertions(+), 3 deletions(-)
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c index b03880fc32b5..b00d97dbf955 100644 --- a/drivers/rtc/rtc-ds1307.c +++ b/drivers/rtc/rtc-ds1307.c @@ -15,6 +15,9 @@ #include <linux/i2c.h> #include <linux/init.h> #include <linux/module.h> +#include <linux/of_device.h> +#include <linux/of_irq.h> +#include <linux/pm_wakeirq.h> #include <linux/rtc/ds1307.h> #include <linux/rtc.h> #include <linux/slab.h> @@ -114,6 +117,7 @@ struct ds1307 { #define HAS_ALARM 1 /* bit 1 == irq claimed */ struct i2c_client *client; struct rtc_device *rtc; + 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, @@ -1156,6 +1160,8 @@ read_rtc: } if (want_irq) { + struct device_node *node = client->dev.of_node; + err = devm_request_threaded_irq(&client->dev, client->irq, NULL, irq_handler, IRQF_SHARED | IRQF_ONESHOT, @@ -1163,13 +1169,36 @@ read_rtc: if (err) { client->irq = 0; dev_err(&client->dev, "unable to request IRQ!\n"); - } else { + goto no_irq; + } + + set_bit(HAS_ALARM, &ds1307->flags); + dev_dbg(&client->dev, "got IRQ %d\n", client->irq); - set_bit(HAS_ALARM, &ds1307->flags); - dev_dbg(&client->dev, "got IRQ %d\n", client->irq); + /* Currently supported by OF code only! */ + if (!node) + goto no_irq; + + ds1307->wakeirq = of_irq_get(node, 1); + if (ds1307->wakeirq <= 0) { + if (ds1307->wakeirq == -EPROBE_DEFER) { + err = ds1307->wakeirq; + goto exit; + } + ds1307->wakeirq = 0; + goto no_irq; + } + + err = dev_pm_set_dedicated_wake_irq(&client->dev, + ds1307->wakeirq); + if (err) { + dev_err(&client->dev, "unable to setup wakeIRQ %d\n", + err); + goto exit; } } +no_irq: if (chip->nvram_size) { ds1307->nvram = devm_kzalloc(&client->dev, @@ -1206,6 +1235,9 @@ read_rtc: return 0; exit: + if (ds1307->wakeirq) + dev_pm_clear_wake_irq(&client->dev); + return err; } @@ -1213,6 +1245,9 @@ static int ds1307_remove(struct i2c_client *client) { struct ds1307 *ds1307 = i2c_get_clientdata(client); + if (ds1307->wakeirq) + dev_pm_clear_wake_irq(&client->dev); + if (test_and_clear_bit(HAS_NVRAM, &ds1307->flags)) sysfs_remove_bin_file(&client->dev.kobj, ds1307->nvram); -- 1.7.9.5
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