diff options
Diffstat (limited to 'target/linux/s3c24xx/patches-2.6.26/1090-fix-lis302dl-suspend-gpio.patch.patch')
| -rwxr-xr-x | target/linux/s3c24xx/patches-2.6.26/1090-fix-lis302dl-suspend-gpio.patch.patch | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/patches-2.6.26/1090-fix-lis302dl-suspend-gpio.patch.patch b/target/linux/s3c24xx/patches-2.6.26/1090-fix-lis302dl-suspend-gpio.patch.patch new file mode 100755 index 0000000..9a9c6051 --- /dev/null +++ b/target/linux/s3c24xx/patches-2.6.26/1090-fix-lis302dl-suspend-gpio.patch.patch @@ -0,0 +1,122 @@ +From f97c81869175362f755488bd50ddf85570236ce8 Mon Sep 17 00:00:00 2001 +From: Andy Green <andy@openmoko.com> +Date: Fri, 25 Jul 2008 23:06:02 +0100 +Subject: [PATCH] fix-lis302dl-suspend-gpio.patch + Add platform stuff to deal with going in and out of suspend + so the motion sensor IO is not driving high into unpowered sensors + +Signed-off-by: Andy Green <andy@openmoko.com> +--- + arch/arm/mach-s3c2440/mach-gta02.c | 28 +++++++++++++++++++++++++++- + drivers/input/misc/lis302dl.c | 15 +++++++++++++++ + include/linux/lis302dl.h | 1 + + 3 files changed, 43 insertions(+), 1 deletions(-) + +diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c +index 5bd68a6..99206ee 100644 +--- a/arch/arm/mach-s3c2440/mach-gta02.c ++++ b/arch/arm/mach-s3c2440/mach-gta02.c +@@ -887,7 +887,31 @@ void gat02_lis302dl_bitbang_read(struct lis302dl_info *lis) + } + + +-struct lis302dl_platform_data lis302_pdata[] = { ++void gat02_lis302dl_suspend_io(struct lis302dl_info *lis, int resume) ++{ ++ struct lis302dl_platform_data *pdata = lis->pdata; ++ ++ if (!resume) { ++ /* ++ * we don't want to power them with a high level ++ * because GSENSOR_3V3 is not up during suspend ++ */ ++ s3c2410_gpio_setpin(pdata->pin_chip_select, 0); ++ s3c2410_gpio_setpin(pdata->pin_clk, 0); ++ s3c2410_gpio_setpin(pdata->pin_mosi, 0); ++ /* misnomer: it is a pullDOWN in 2442 */ ++ s3c2410_gpio_pullup(pdata->pin_miso, 1); ++ return; ++ } ++ ++ /* back to normal */ ++ s3c2410_gpio_setpin(pdata->pin_chip_select, 1); ++ s3c2410_gpio_setpin(pdata->pin_clk, 1); ++ /* misnomer: it is a pullDOWN in 2442 */ ++ s3c2410_gpio_pullup(pdata->pin_miso, 0); ++} ++ ++const struct lis302dl_platform_data lis302_pdata[] = { + { + .name = "lis302-1 (top)", + .pin_chip_select= S3C2410_GPD12, +@@ -896,6 +920,7 @@ struct lis302dl_platform_data lis302_pdata[] = { + .pin_miso = S3C2410_GPG5, + .open_drain = 1, /* altered at runtime by PCB rev */ + .lis302dl_bitbang_read = gat02_lis302dl_bitbang_read, ++ .lis302dl_suspend_io = gat02_lis302dl_suspend_io, + }, { + .name = "lis302-2 (bottom)", + .pin_chip_select= S3C2410_GPD13, +@@ -904,6 +929,7 @@ struct lis302dl_platform_data lis302_pdata[] = { + .pin_miso = S3C2410_GPG5, + .open_drain = 1, /* altered at runtime by PCB rev */ + .lis302dl_bitbang_read = gat02_lis302dl_bitbang_read, ++ .lis302dl_suspend_io = gat02_lis302dl_suspend_io, + }, + }; + +diff --git a/drivers/input/misc/lis302dl.c b/drivers/input/misc/lis302dl.c +index 36bdcf7..2be816a 100644 +--- a/drivers/input/misc/lis302dl.c ++++ b/drivers/input/misc/lis302dl.c +@@ -428,6 +428,15 @@ static int lis302dl_suspend(struct spi_device *spi, pm_message_t state) + disable_irq(lis->spi_dev->irq); + local_save_flags(flags); + ++ /* ++ * When we share SPI over multiple sensors, there is a race here ++ * that one or more sensors will lose. In that case, the shared ++ * SPI bus GPIO will be in sleep mode and partially pulled down. So ++ * we explicitly put our IO into "wake" mode here before the final ++ * traffic to the sensor. ++ */ ++ (lis->pdata->lis302dl_suspend_io)(lis, 1); ++ + /* save registers */ + lis->regs[LIS302DL_REG_CTRL1] = reg_read(lis, LIS302DL_REG_CTRL1); + lis->regs[LIS302DL_REG_CTRL2] = reg_read(lis, LIS302DL_REG_CTRL2); +@@ -467,6 +476,9 @@ static int lis302dl_suspend(struct spi_device *spi, pm_message_t state) + reg_write(lis, LIS302DL_REG_CTRL1, tmp); + } + ++ /* place our IO to the device in sleep-compatible states */ ++ (lis->pdata->lis302dl_suspend_io)(lis, 0); ++ + local_irq_restore(flags); + + return 0; +@@ -479,6 +491,9 @@ static int lis302dl_resume(struct spi_device *spi) + + local_save_flags(flags); + ++ /* get our IO to the device back in operational states */ ++ (lis->pdata->lis302dl_suspend_io)(lis, 1); ++ + /* restore registers after resume */ + reg_write(lis, LIS302DL_REG_CTRL1, lis->regs[LIS302DL_REG_CTRL1]); + reg_write(lis, LIS302DL_REG_CTRL2, lis->regs[LIS302DL_REG_CTRL2]); +diff --git a/include/linux/lis302dl.h b/include/linux/lis302dl.h +index 2dea813..0d6b4c4 100644 +--- a/include/linux/lis302dl.h ++++ b/include/linux/lis302dl.h +@@ -16,6 +16,7 @@ struct lis302dl_platform_data { + unsigned long pin_miso; + int open_drain; + void (*lis302dl_bitbang_read)(struct lis302dl_info *); ++ void (*lis302dl_suspend_io)(struct lis302dl_info *, int resuming); + }; + + struct lis302dl_info { +-- +1.5.6.3 + |