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[ARM] 5259/2: [AT91] PWM LEDs on AT91SAM9263-EK 

Use the PWM controller and leds-atmel-pwm.c driver to drive a LED on
the Atmel AT91SAM9263-EK board.

Signed-off-by: Sedji Gaouaou <sedji.gaouaou@atmel.com>
Signed-off-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Andrew Victor 2008-09-21 21:31:16 +01:00 committed by Russell King
parent bb1ad68b96
commit a7307bf225
3 changed files with 57 additions and 10 deletions
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25
arch/arm/mach-at91/board-sam9263ek.c
View File

@ -30,6 +30,7 @@
#include <linux/fb.h>
#include <linux/gpio_keys.h>
#include <linux/input.h>
#include <linux/leds.h>
#include <video/atmel_lcdc.h>
@ -339,25 +340,32 @@ static struct atmel_ac97_data ek_ac97_data = {
* LEDs ... these could all be PWM-driven, for variable brightness
*/
static struct gpio_led ek_leds[] = {
{ /* "left" led, green, userled1, pwm1 */
.name = "ds1",
.gpio = AT91_PIN_PB8,
.active_low = 1,
.default_trigger = "mmc0",
},
{ /* "right" led, green, userled2, pwm2 */
{ /* "right" led, green, userled2 (could be driven by pwm2) */
.name = "ds2",
.gpio = AT91_PIN_PC29,
.active_low = 1,
.default_trigger = "nand-disk",
},
{ /* "power" led, yellow, pwm0 */
{ /* "power" led, yellow (could be driven by pwm0) */
.name = "ds3",
.gpio = AT91_PIN_PB7,
.default_trigger = "heartbeat",
}
};
/*
* PWM Leds
*/
static struct gpio_led ek_pwm_led[] = {
/* For now only DS1 is PWM-driven (by pwm1) */
{
.name = "ds1",
.gpio = 1, /* is PWM channel number */
.active_low = 1,
.default_trigger = "none",
}
};
static void __init ek_board_init(void)
{
@ -388,6 +396,7 @@ static void __init ek_board_init(void)
at91_add_device_ac97(&ek_ac97_data);
/* LEDs */
at91_gpio_leds(ek_leds, ARRAY_SIZE(ek_leds));
at91_pwm_leds(ek_pwm_led, ARRAY_SIZE(ek_pwm_led));
}
MACHINE_START(AT91SAM9263EK, "Atmel AT91SAM9263-EK")

1
arch/arm/mach-at91/include/mach/board.h
View File

@ -175,6 +175,7 @@ extern void __init at91_add_device_isi(void);
/* LEDs */
extern void __init at91_init_leds(u8 cpu_led, u8 timer_led);
extern void __init at91_gpio_leds(struct gpio_led *leds, int nr);
extern void __init at91_pwm_leds(struct gpio_led *leds, int nr);
/* FIXME: this needs a better location, but gets stuff building again */
extern int at91_suspend_entering_slow_clock(void);

41
arch/arm/mach-at91/leds.c
View File

@ -12,6 +12,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <mach/board.h>
#include <mach/gpio.h>
@ -21,8 +22,6 @@
#if defined(CONFIG_NEW_LEDS)
#include <linux/platform_device.h>
/*
* New cross-platform LED support.
*/
@ -55,6 +54,44 @@ void __init at91_gpio_leds(struct gpio_led *leds, int nr) {}
#endif
/* ------------------------------------------------------------------------- */
#if defined (CONFIG_LEDS_ATMEL_PWM)
/*
* PWM Leds
*/
static struct gpio_led_platform_data pwm_led_data;
static struct platform_device at91_pwm_leds = {
.name = "leds-atmel-pwm",
.id = -1,
.dev.platform_data = &pwm_led_data,
};
void __init at91_pwm_leds(struct gpio_led *leds, int nr)
{
int i;
u32 pwm_mask = 0;
if (!nr)
return;
for (i = 0; i < nr; i++)
pwm_mask |= (1 << leds[i].gpio);
pwm_led_data.leds = leds;
pwm_led_data.num_leds = nr;
at91_add_device_pwm(pwm_mask);
platform_device_register(&at91_pwm_leds);
}
#else
void __init at91_pwm_leds(struct gpio_led *leds, int nr){}
#endif
/* ------------------------------------------------------------------------- */
#if defined(CONFIG_LEDS)