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input: serio: ams-delta: toggle keyboard power over GPIO

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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.

Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
[tony@atomide.com: renamed _gpios to ams_delta_gpios]
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Janusz Krzysztofik 2011-12-20 23:10:34 +01:00 committed by Tony Lindgren
parent a218d19f6a
commit 8d09a1bb31
3 changed files with 35 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/arm/mach-omap1/board-ams-delta.c
View File

@ -226,16 +226,6 @@ static struct gpio latch_gpios[] __initconst = {
.flags = GPIOF_OUT_INIT_LOW,
.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,

2
arch/arm/plat-omap/include/plat/board-ams-delta.h
View File

@ -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

56
drivers/input/serio/ams_delta_serio.c
View File

@ -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 ams_delta_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 +145,12 @@ 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(ams_delta_gpios,
ARRAY_SIZE(ams_delta_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 +158,7 @@ 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 +172,20 @@ 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(ams_delta_gpios,
ARRAY_SIZE(ams_delta_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(ams_delta_gpios,
ARRAY_SIZE(ams_delta_gpios));
}
module_exit(ams_delta_serio_exit);