[PATCH] lms283gf05: add suspend/resume handlers
From: Vasily Khoruzhick <anarsoul@gmail.com>
Date: 2012-10-28 15:49:17
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com> --- drivers/video/backlight/lms283gf05.c | 42 ++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+)
diff --git a/drivers/video/backlight/lms283gf05.c b/drivers/video/backlight/lms283gf05.c
index ea43f22..ed15752 100644
--- a/drivers/video/backlight/lms283gf05.c
+++ b/drivers/video/backlight/lms283gf05.c@@ -22,6 +22,7 @@ struct lms283gf05_state { struct spi_device *spi; struct lcd_device *ld; + unsigned int power; }; struct lms283gf05_seq {
@@ -130,6 +131,8 @@ static int lms283gf05_power_set(struct lcd_device *ld, int power) struct spi_device *spi = st->spi; struct lms283gf05_pdata *pdata = spi->dev.platform_data; + st->power = power; + if (power <= FB_BLANK_NORMAL) { if (pdata) lms283gf05_reset(pdata->reset_gpio,
@@ -193,6 +196,43 @@ static int __devinit lms283gf05_probe(struct spi_device *spi) return 0; } +#if defined(CONFIG_PM) +static unsigned int before_power; + +static int lms283gf05_suspend(struct spi_device *spi, pm_message_t mesg) +{ + int ret = 0; + struct lms283gf05_state *state = dev_get_drvdata(&spi->dev); + + dev_dbg(&spi->dev, "lcd->power = %d\n", state->power); + + before_power = state->power; + + /* + * when lcd panel is suspend, lcd panel becomes off + * regardless of status. + */ + ret = lms283gf05_power_set(state->ld, FB_BLANK_POWERDOWN); + + return ret; +} + +static int lms283gf05_resume(struct spi_device *spi) +{ + int ret = 0; + struct lms283gf05_state *state = dev_get_drvdata(&spi->dev); + + dev_dbg(&spi->dev, "before_power = %d\n", before_power); + + ret = lms283gf05_power_set(state->ld, before_power); + + return ret; +} +#else +#define lms283gf05_suspend NULL +#define lms283gf05_resume NULL +#endif + static int __devexit lms283gf05_remove(struct spi_device *spi) { struct lms283gf05_state *st = dev_get_drvdata(&spi->dev);
@@ -209,6 +249,8 @@ static struct spi_driver lms283gf05_driver = { }, .probe = lms283gf05_probe, .remove = __devexit_p(lms283gf05_remove), + .suspend = lms283gf05_suspend, + .resume = lms283gf05_resume, }; module_spi_driver(lms283gf05_driver);
--
1.7.12.4