1/*
  2 * LED driver for Atmel AT91-based boards.
  3 *
  4 *  Copyright (C) SAN People (Pty) Ltd
  5 *
  6 * This program is free software; you can redistribute it and/or
  7 * modify it under the terms of the GNU General Public License
  8 * as published by the Free Software Foundation; either version
  9 * 2 of the License, or (at your option) any later version.
 10*/
 11
 12#include <linux/gpio.h>
 13#include <linux/kernel.h>
 14#include <linux/module.h>
 15#include <linux/init.h>
 16#include <linux/platform_device.h>
 17
 18#include <mach/board.h>
 19
 20
 21/* ------------------------------------------------------------------------- */
 22
 23#if defined(CONFIG_NEW_LEDS)
 24
 25/*
 26 * New cross-platform LED support.
 27 */
 28
 29static struct gpio_led_platform_data led_data;
 30
 31static struct platform_device at91_gpio_leds_device = {
 32	.name			= "leds-gpio",
 33	.id			= -1,
 34	.dev.platform_data	= &led_data,
 35};
 36
 37void __init at91_gpio_leds(struct gpio_led *leds, int nr)
 38{
 39	int i;
 40
 41	if (!nr)
 42		return;
 43
 44	for (i = 0; i < nr; i++)
 45		at91_set_gpio_output(leds[i].gpio, leds[i].active_low);
 46
 47	led_data.leds = leds;
 48	led_data.num_leds = nr;
 49	platform_device_register(&at91_gpio_leds_device);
 50}
 51
 52#else
 53void __init at91_gpio_leds(struct gpio_led *leds, int nr) {}
 54#endif
 55
 56
 57/* ------------------------------------------------------------------------- */
 58
 59#if defined (CONFIG_LEDS_ATMEL_PWM)
 60
 61/*
 62 * PWM Leds
 63 */
 64
 65static struct gpio_led_platform_data pwm_led_data;
 66
 67static struct platform_device at91_pwm_leds_device = {
 68	.name			= "leds-atmel-pwm",
 69	.id			= -1,
 70	.dev.platform_data	= &pwm_led_data,
 71};
 72
 73void __init at91_pwm_leds(struct gpio_led *leds, int nr)
 74{
 75	int i;
 76	u32 pwm_mask = 0;
 77
 78	if (!nr)
 79		return;
 80
 81	for (i = 0; i < nr; i++)
 82		pwm_mask |= (1 << leds[i].gpio);
 83
 84	pwm_led_data.leds = leds;
 85	pwm_led_data.num_leds = nr;
 86
 87	at91_add_device_pwm(pwm_mask);
 88	platform_device_register(&at91_pwm_leds_device);
 89}
 90#else
 91void __init at91_pwm_leds(struct gpio_led *leds, int nr){}
 92#endif
 93
 94
 95/* ------------------------------------------------------------------------- */
 96
 97#if defined(CONFIG_LEDS)
 98
 99#include <asm/leds.h>
100
101/*
102 * Old ARM-specific LED framework; not fully functional when generic time is
103 * in use.
104 */
105
106static u8 at91_leds_cpu;
107static u8 at91_leds_timer;
108
109static inline void at91_led_on(unsigned int led)
110{
111	at91_set_gpio_value(led, 0);
112}
113
114static inline void at91_led_off(unsigned int led)
115{
116	at91_set_gpio_value(led, 1);
117}
118
119static inline void at91_led_toggle(unsigned int led)
120{
121	unsigned long is_off = at91_get_gpio_value(led);
122	if (is_off)
123		at91_led_on(led);
124	else
125		at91_led_off(led);
126}
127
128
129/*
130 * Handle LED events.
131 */
132static void at91_leds_event(led_event_t evt)
133{
134	unsigned long flags;
135
136	local_irq_save(flags);
137
138	switch(evt) {
139	case led_start:		/* System startup */
140		at91_led_on(at91_leds_cpu);
141		break;
142
143	case led_stop:		/* System stop / suspend */
144		at91_led_off(at91_leds_cpu);
145		break;
146
147#ifdef CONFIG_LEDS_TIMER
148	case led_timer:		/* Every 50 timer ticks */
149		at91_led_toggle(at91_leds_timer);
150		break;
151#endif
152
153#ifdef CONFIG_LEDS_CPU
154	case led_idle_start:	/* Entering idle state */
155		at91_led_off(at91_leds_cpu);
156		break;
157
158	case led_idle_end:	/* Exit idle state */
159		at91_led_on(at91_leds_cpu);
160		break;
161#endif
162
163	default:
164		break;
165	}
166
167	local_irq_restore(flags);
168}
169
170
171static int __init leds_init(void)
172{
173	if (!at91_leds_timer || !at91_leds_cpu)
174		return -ENODEV;
175
176	leds_event = at91_leds_event;
177
178	leds_event(led_start);
179	return 0;
180}
181
182__initcall(leds_init);
183
184
185void __init at91_init_leds(u8 cpu_led, u8 timer_led)
186{
187	/* Enable GPIO to access the LEDs */
188	at91_set_gpio_output(cpu_led, 1);
189	at91_set_gpio_output(timer_led, 1);
190
191	at91_leds_cpu	= cpu_led;
192	at91_leds_timer	= timer_led;
193}
194
195#else
196void __init at91_init_leds(u8 cpu_led, u8 timer_led) {}
197#endif