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Diffstat (limited to 'target/linux/s3c24xx/patches/0090-fix-lis302dl-suspend-gpio.patch.patch')
-rwxr-xr-xtarget/linux/s3c24xx/patches/0090-fix-lis302dl-suspend-gpio.patch.patch122
1 files changed, 122 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/patches/0090-fix-lis302dl-suspend-gpio.patch.patch b/target/linux/s3c24xx/patches/0090-fix-lis302dl-suspend-gpio.patch.patch
new file mode 100755
index 0000000000..9a9c6051d2
--- /dev/null
+++ b/target/linux/s3c24xx/patches/0090-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
+