[PATCH] input: serio: ams-delta: toggle keyboard power over GPIO
Tony Lindgren
tony at atomide.com
Wed Dec 21 14:09:45 EST 2011
* Janusz Krzysztofik <jkrzyszt at tis.icnet.pl> [111220 13:39]:
> Don't use Amstrad Delta custom I/O functions once GPIO interface is
> available for the underlying hardware.
>
> While requesting and initializing GPIO pins used, also take care of one
> extra pin KEYBRD_DATAOUT which, even if not used by the driver, belongs
> to the device and affects its functioning.
>
> Once done, move the driver initialization back to the device_initcall
> level, reverting the temporary chane introduced with patch 1/7 "ARM:
> OMAP1: ams-delta: register latch dependent devices later". That change
> is no longer required once the driver takes care of registering used
> GPIO pins, and it's better to initialize the device before others using
> the latch2 based GPIO pins, otherwise a garbage is reported on boot,
> perhaps due to random data already captured by the FIQ handler while the
> keyboard related latch bits are written with random values during
> initialization of those other latch2 dependent devices.
>
> Depends on patch 2/7 "ARM: OMAP1: ams-delta: convert latches to
> basic_mmio_gpio"
>
> Signed-off-by: Janusz Krzysztofik <jkrzyszt at tis.icnet.pl>
I'm assuming Dmitry's ack for an earlier version of this patch also
covers this one when applying.
Regards,
Tony
> ---
> Hi,
> I'm submitting only this one refreshed on top of updated 1/7. All others
> (2/7-6/7) don't require any refresh, can be rebased smoothly.
>
> Thanks,
> Janusz
>
>
> Changes against version 2:
> * refreshed on top of updated patch 1/7 v2,
> * changelog: corrected patch 1/7 summary (was inaccurate).
>
> Changes against initial version:
> * was 9/10,
> * rebased on top of v2 of patch 2/7, just in case,
> * moved AMS_DELTA_GPIO_PIN_KEYBRD_DATAOUT pin handling from the board
> code to the driver,
> * reverted a temporary change to the driver initcall level, introduced
> by the new solution provided with patch 1/7.
>
>
> arch/arm/mach-omap1/board-ams-delta.c | 10 ----
> arch/arm/plat-omap/include/plat/board-ams-delta.h | 2 -
> drivers/input/serio/ams_delta_serio.c | 53 ++++++++++++--------
> :x 3 files changed, 32 insertions(+), 33 deletions(-)
>
> diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c
> index 3aba8f9..673cf21 100644
> --- a/arch/arm/mach-omap1/board-ams-delta.c
> +++ b/arch/arm/mach-omap1/board-ams-delta.c
> @@ -227,16 +227,6 @@ static struct gpio latch_gpios[] __initconst = {
> .label = "dockit2",
> },
> {
> - .gpio = AMS_DELTA_GPIO_PIN_KEYBRD_PWR,
> - .flags = GPIOF_OUT_INIT_LOW,
> - .label = "keybrd_pwr",
> - },
> - {
> - .gpio = AMS_DELTA_GPIO_PIN_KEYBRD_DATAOUT,
> - .flags = GPIOF_OUT_INIT_LOW,
> - .label = "keybrd_dataout",
> - },
> - {
> .gpio = AMS_DELTA_GPIO_PIN_SCARD_RSTIN,
> .flags = GPIOF_OUT_INIT_LOW,
> .label = "scard_rstin",
> diff --git a/arch/arm/plat-omap/include/plat/board-ams-delta.h b/arch/arm/plat-omap/include/plat/board-ams-delta.h
> index e9ad673..027e79e 100644
> --- a/arch/arm/plat-omap/include/plat/board-ams-delta.h
> +++ b/arch/arm/plat-omap/include/plat/board-ams-delta.h
> @@ -28,8 +28,6 @@
>
> #if defined (CONFIG_MACH_AMS_DELTA)
>
> -#define AMD_DELTA_LATCH2_KEYBRD_PWR 0x0100
> -#define AMD_DELTA_LATCH2_KEYBRD_DATA 0x0200
> #define AMD_DELTA_LATCH2_SCARD_RSTIN 0x0400
> #define AMD_DELTA_LATCH2_SCARD_CMDVCC 0x0800
> #define AMS_DELTA_LATCH2_MODEM_NRESET 0x1000
> diff --git a/drivers/input/serio/ams_delta_serio.c b/drivers/input/serio/ams_delta_serio.c
> index 835d37a..ef1ec40 100644
> --- a/drivers/input/serio/ams_delta_serio.c
> +++ b/drivers/input/serio/ams_delta_serio.c
> @@ -92,8 +92,7 @@ static irqreturn_t ams_delta_serio_interrupt(int irq, void *dev_id)
> static int ams_delta_serio_open(struct serio *serio)
> {
> /* enable keyboard */
> - ams_delta_latch2_write(AMD_DELTA_LATCH2_KEYBRD_PWR,
> - AMD_DELTA_LATCH2_KEYBRD_PWR);
> + gpio_set_value(AMS_DELTA_GPIO_PIN_KEYBRD_PWR, 1);
>
> return 0;
> }
> @@ -101,9 +100,32 @@ static int ams_delta_serio_open(struct serio *serio)
> static void ams_delta_serio_close(struct serio *serio)
> {
> /* disable keyboard */
> - ams_delta_latch2_write(AMD_DELTA_LATCH2_KEYBRD_PWR, 0);
> + gpio_set_value(AMS_DELTA_GPIO_PIN_KEYBRD_PWR, 0);
> }
>
> +static struct gpio _gpios[] __initconst_or_module = {
> + {
> + .gpio = AMS_DELTA_GPIO_PIN_KEYBRD_DATA,
> + .flags = GPIOF_DIR_IN,
> + .label = "serio-data",
> + },
> + {
> + .gpio = AMS_DELTA_GPIO_PIN_KEYBRD_CLK,
> + .flags = GPIOF_DIR_IN,
> + .label = "serio-clock",
> + },
> + {
> + .gpio = AMS_DELTA_GPIO_PIN_KEYBRD_PWR,
> + .flags = GPIOF_OUT_INIT_LOW,
> + .label = "serio-power",
> + },
> + {
> + .gpio = AMS_DELTA_GPIO_PIN_KEYBRD_DATAOUT,
> + .flags = GPIOF_OUT_INIT_LOW,
> + .label = "serio-dataout",
> + },
> +};
> +
> static int __init ams_delta_serio_init(void)
> {
> int err;
> @@ -123,19 +145,11 @@ static int __init ams_delta_serio_init(void)
> strlcpy(ams_delta_serio->phys, "GPIO/serio0",
> sizeof(ams_delta_serio->phys));
>
> - err = gpio_request(AMS_DELTA_GPIO_PIN_KEYBRD_DATA, "serio-data");
> + err = gpio_request_array(_gpios, ARRAY_SIZE(_gpios));
> if (err) {
> - pr_err("ams_delta_serio: Couldn't request gpio pin for data\n");
> + pr_err("ams_delta_serio: Couldn't request gpio pins\n");
> goto serio;
> }
> - gpio_direction_input(AMS_DELTA_GPIO_PIN_KEYBRD_DATA);
> -
> - err = gpio_request(AMS_DELTA_GPIO_PIN_KEYBRD_CLK, "serio-clock");
> - if (err) {
> - pr_err("ams_delta_serio: couldn't request gpio pin for clock\n");
> - goto gpio_data;
> - }
> - gpio_direction_input(AMS_DELTA_GPIO_PIN_KEYBRD_CLK);
>
> err = request_irq(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK),
> ams_delta_serio_interrupt, IRQ_TYPE_EDGE_RISING,
> @@ -143,7 +157,7 @@ static int __init ams_delta_serio_init(void)
> if (err < 0) {
> pr_err("ams_delta_serio: couldn't request gpio interrupt %d\n",
> gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK));
> - goto gpio_clk;
> + goto gpio;
> }
> /*
> * Since GPIO register handling for keyboard clock pin is performed
> @@ -157,21 +171,18 @@ static int __init ams_delta_serio_init(void)
> dev_info(&ams_delta_serio->dev, "%s\n", ams_delta_serio->name);
>
> return 0;
> -gpio_clk:
> - gpio_free(AMS_DELTA_GPIO_PIN_KEYBRD_CLK);
> -gpio_data:
> - gpio_free(AMS_DELTA_GPIO_PIN_KEYBRD_DATA);
> +gpio:
> + gpio_free_array(_gpios, ARRAY_SIZE(_gpios));
> serio:
> kfree(ams_delta_serio);
> return err;
> }
> -late_initcall(ams_delta_serio_init);
> +module_init(ams_delta_serio_init);
>
> static void __exit ams_delta_serio_exit(void)
> {
> serio_unregister_port(ams_delta_serio);
> free_irq(OMAP_GPIO_IRQ(AMS_DELTA_GPIO_PIN_KEYBRD_CLK), 0);
> - gpio_free(AMS_DELTA_GPIO_PIN_KEYBRD_CLK);
> - gpio_free(AMS_DELTA_GPIO_PIN_KEYBRD_DATA);
> + gpio_free_array(_gpios, ARRAY_SIZE(_gpios));
> }
> module_exit(ams_delta_serio_exit);
> --
> 1.7.3.4
>
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