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Andrew Victorcc2832a2006-04-02 17:15:48 +01001/*
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
Andrew Victorcc2832a2006-04-02 17:15:48 +010012#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/init.h>
Andrew Victora7307bf2008-09-21 21:31:16 +010015#include <linux/platform_device.h>
Andrew Victorcc2832a2006-04-02 17:15:48 +010016
Russell Kinga09e64f2008-08-05 16:14:15 +010017#include <mach/board.h>
18#include <mach/gpio.h>
Andrew Victorcc2832a2006-04-02 17:15:48 +010019
20
Andrew Victora04ff1a2008-01-23 09:27:06 +010021/* ------------------------------------------------------------------------- */
22
23#if defined(CONFIG_NEW_LEDS)
24
Andrew Victora04ff1a2008-01-23 09:27:06 +010025/*
26 * New cross-platform LED support.
27 */
28
29static struct gpio_led_platform_data led_data;
30
Andrew Victor791ccf22008-09-24 22:03:52 +010031static struct platform_device at91_gpio_leds_device = {
Andrew Victora04ff1a2008-01-23 09:27:06 +010032 .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;
Andrew Victor791ccf22008-09-24 22:03:52 +010049 platform_device_register(&at91_gpio_leds_device);
Andrew Victora04ff1a2008-01-23 09:27:06 +010050}
51
52#else
53void __init at91_gpio_leds(struct gpio_led *leds, int nr) {}
54#endif
55
56
57/* ------------------------------------------------------------------------- */
58
Andrew Victora7307bf2008-09-21 21:31:16 +010059#if defined (CONFIG_LEDS_ATMEL_PWM)
60
61/*
62 * PWM Leds
63 */
64
65static struct gpio_led_platform_data pwm_led_data;
66
Andrew Victor791ccf22008-09-24 22:03:52 +010067static struct platform_device at91_pwm_leds_device = {
Andrew Victora7307bf2008-09-21 21:31:16 +010068 .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);
Andrew Victor791ccf22008-09-24 22:03:52 +010088 platform_device_register(&at91_pwm_leds_device);
Andrew Victora7307bf2008-09-21 21:31:16 +010089}
90#else
91void __init at91_pwm_leds(struct gpio_led *leds, int nr){}
92#endif
93
94
95/* ------------------------------------------------------------------------- */
96
Andrew Victora04ff1a2008-01-23 09:27:06 +010097#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
Andrew Victorcc2832a2006-04-02 17:15:48 +0100109static 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
Andrew Victorcc2832a2006-04-02 17:15:48 +0100176 leds_event = at91_leds_event;
177
178 leds_event(led_start);
179 return 0;
180}
181
182__initcall(leds_init);
Andrew Victora04ff1a2008-01-23 09:27:06 +0100183
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