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fc54b9bf15
(stable-branch of Openmoko) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13613 3c298f89-4303-0410-b956-a3cf2f4a3e73
123 lines
4.2 KiB
Diff
123 lines
4.2 KiB
Diff
From b1f47a12474fdb7c00e2234a8a02a7e1a2031a1e Mon Sep 17 00:00:00 2001
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From: Andy Green <andy@openmoko.com>
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Date: Sun, 13 Apr 2008 07:25:51 +0100
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Subject: [PATCH] fix-lis302dl-suspend-gpio.patch
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Add platform stuff to deal with going in and out of suspend
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so the motion sensor IO is not driving high into unpowered sensors
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Signed-off-by: Andy Green <andy@openmoko.com>
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---
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arch/arm/mach-s3c2440/mach-gta02.c | 28 +++++++++++++++++++++++++++-
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drivers/input/misc/lis302dl.c | 15 +++++++++++++++
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include/linux/lis302dl.h | 1 +
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3 files changed, 43 insertions(+), 1 deletions(-)
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diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
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index 5bd68a6..99206ee 100644
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--- a/arch/arm/mach-s3c2440/mach-gta02.c
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+++ b/arch/arm/mach-s3c2440/mach-gta02.c
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@@ -887,7 +887,31 @@ void gat02_lis302dl_bitbang_read(struct lis302dl_info *lis)
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}
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-struct lis302dl_platform_data lis302_pdata[] = {
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+void gat02_lis302dl_suspend_io(struct lis302dl_info *lis, int resume)
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+{
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+ struct lis302dl_platform_data *pdata = lis->pdata;
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+
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+ if (!resume) {
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+ /*
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+ * we don't want to power them with a high level
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+ * because GSENSOR_3V3 is not up during suspend
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+ */
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+ s3c2410_gpio_setpin(pdata->pin_chip_select, 0);
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+ s3c2410_gpio_setpin(pdata->pin_clk, 0);
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+ s3c2410_gpio_setpin(pdata->pin_mosi, 0);
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+ /* misnomer: it is a pullDOWN in 2442 */
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+ s3c2410_gpio_pullup(pdata->pin_miso, 1);
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+ return;
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+ }
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+
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+ /* back to normal */
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+ s3c2410_gpio_setpin(pdata->pin_chip_select, 1);
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+ s3c2410_gpio_setpin(pdata->pin_clk, 1);
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+ /* misnomer: it is a pullDOWN in 2442 */
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+ s3c2410_gpio_pullup(pdata->pin_miso, 0);
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+}
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+
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+const struct lis302dl_platform_data lis302_pdata[] = {
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{
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.name = "lis302-1 (top)",
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.pin_chip_select= S3C2410_GPD12,
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@@ -896,6 +920,7 @@ struct lis302dl_platform_data lis302_pdata[] = {
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.pin_miso = S3C2410_GPG5,
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.open_drain = 1, /* altered at runtime by PCB rev */
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.lis302dl_bitbang_read = gat02_lis302dl_bitbang_read,
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+ .lis302dl_suspend_io = gat02_lis302dl_suspend_io,
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}, {
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.name = "lis302-2 (bottom)",
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.pin_chip_select= S3C2410_GPD13,
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@@ -904,6 +929,7 @@ struct lis302dl_platform_data lis302_pdata[] = {
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.pin_miso = S3C2410_GPG5,
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.open_drain = 1, /* altered at runtime by PCB rev */
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.lis302dl_bitbang_read = gat02_lis302dl_bitbang_read,
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+ .lis302dl_suspend_io = gat02_lis302dl_suspend_io,
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},
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};
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diff --git a/drivers/input/misc/lis302dl.c b/drivers/input/misc/lis302dl.c
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index 36bdcf7..2be816a 100644
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--- a/drivers/input/misc/lis302dl.c
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+++ b/drivers/input/misc/lis302dl.c
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@@ -428,6 +428,15 @@ static int lis302dl_suspend(struct spi_device *spi, pm_message_t state)
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disable_irq(lis->spi_dev->irq);
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local_save_flags(flags);
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+ /*
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+ * When we share SPI over multiple sensors, there is a race here
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+ * that one or more sensors will lose. In that case, the shared
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+ * SPI bus GPIO will be in sleep mode and partially pulled down. So
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+ * we explicitly put our IO into "wake" mode here before the final
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+ * traffic to the sensor.
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+ */
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+ (lis->pdata->lis302dl_suspend_io)(lis, 1);
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+
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/* save registers */
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lis->regs[LIS302DL_REG_CTRL1] = reg_read(lis, LIS302DL_REG_CTRL1);
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lis->regs[LIS302DL_REG_CTRL2] = reg_read(lis, LIS302DL_REG_CTRL2);
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@@ -467,6 +476,9 @@ static int lis302dl_suspend(struct spi_device *spi, pm_message_t state)
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reg_write(lis, LIS302DL_REG_CTRL1, tmp);
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}
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+ /* place our IO to the device in sleep-compatible states */
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+ (lis->pdata->lis302dl_suspend_io)(lis, 0);
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+
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local_irq_restore(flags);
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return 0;
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@@ -479,6 +491,9 @@ static int lis302dl_resume(struct spi_device *spi)
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local_save_flags(flags);
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+ /* get our IO to the device back in operational states */
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+ (lis->pdata->lis302dl_suspend_io)(lis, 1);
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+
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/* restore registers after resume */
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reg_write(lis, LIS302DL_REG_CTRL1, lis->regs[LIS302DL_REG_CTRL1]);
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reg_write(lis, LIS302DL_REG_CTRL2, lis->regs[LIS302DL_REG_CTRL2]);
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diff --git a/include/linux/lis302dl.h b/include/linux/lis302dl.h
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index 2dea813..0d6b4c4 100644
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--- a/include/linux/lis302dl.h
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+++ b/include/linux/lis302dl.h
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@@ -16,6 +16,7 @@ struct lis302dl_platform_data {
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unsigned long pin_miso;
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int open_drain;
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void (*lis302dl_bitbang_read)(struct lis302dl_info *);
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+ void (*lis302dl_suspend_io)(struct lis302dl_info *, int resuming);
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};
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struct lis302dl_info {
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--
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1.5.6.5
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