add proper led support to ifxmips
[openwrt/svn-archive/archive.git] / target / linux / ifxmips / files / drivers / char / ifxmips_led.c
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
15 *
16 * Copyright (C) 2006 infineon
17 * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
18 *
19 */
20
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/version.h>
24 #include <linux/types.h>
25 #include <linux/fs.h>
26 #include <linux/init.h>
27 #include <linux/platform_device.h>
28 #include <asm/uaccess.h>
29 #include <asm/unistd.h>
30 #include <linux/errno.h>
31 #include <asm/ifxmips/ifxmips.h>
32 #include <asm/ifxmips/ifxmips_gpio.h>
33 #include <asm/ifxmips/ifxmips_pmu.h>
34 #include <linux/leds.h>
35 #include <linux/delay.h>
36
37 #define DRVNAME "ifxmips_led"
38
39 #define IFXMIPS_LED_CLK_EDGE IFXMIPS_LED_FALLING
40 //#define IFXMIPS_LED_CLK_EDGE IFXMIPS_LED_RISING
41
42 #define IFXMIPS_LED_SPEED IFXMIPS_LED_8HZ
43
44 #define IFXMIPS_LED_GPIO_PORT 0
45
46 #define IFXMIPS_MAX_LED 24
47
48 struct ifxmips_led {
49 struct led_classdev cdev;
50 u8 bit;
51 };
52
53 void
54 ifxmips_led_set (unsigned int led)
55 {
56 led &= 0xffffff;
57 writel(readl(IFXMIPS_LED_CPU0) | led, IFXMIPS_LED_CPU0);
58 }
59 EXPORT_SYMBOL(ifxmips_led_set);
60
61 void
62 ifxmips_led_clear (unsigned int led)
63 {
64 led = ~(led & 0xffffff);
65 writel(readl(IFXMIPS_LED_CPU0) & led, IFXMIPS_LED_CPU0);
66 }
67 EXPORT_SYMBOL(ifxmips_led_clear);
68
69 void
70 ifxmips_led_blink_set (unsigned int led)
71 {
72 led &= 0xffffff;
73 writel(readl(IFXMIPS_LED_CON0) | led, IFXMIPS_LED_CON0);
74 }
75 EXPORT_SYMBOL(ifxmips_led_blink_set);
76
77 void
78 ifxmips_led_blink_clear (unsigned int led)
79 {
80 led = ~(led & 0xffffff);
81 writel(readl(IFXMIPS_LED_CON0) & led, IFXMIPS_LED_CON0);
82 }
83 EXPORT_SYMBOL(ifxmips_led_blink_clear);
84
85 void
86 ifxmips_ledapi_set(struct led_classdev *led_cdev, enum led_brightness value)
87 {
88 struct ifxmips_led *led_dev = container_of(led_cdev, struct ifxmips_led, cdev);
89
90 if(value)
91 ifxmips_led_set(1 << led_dev->bit);
92 else
93 ifxmips_led_clear(1 << led_dev->bit);
94 }
95
96 void
97 ifxmips_led_setup_gpio (void)
98 {
99 int i = 0;
100
101 /* we need to setup pins SH,D,ST (4,5,6) */
102 for (i = 4; i < 7; i++)
103 {
104 ifxmips_port_set_altsel0(IFXMIPS_LED_GPIO_PORT, i);
105 ifxmips_port_clear_altsel1(IFXMIPS_LED_GPIO_PORT, i);
106 ifxmips_port_set_dir_out(IFXMIPS_LED_GPIO_PORT, i);
107 ifxmips_port_set_open_drain(IFXMIPS_LED_GPIO_PORT, i);
108 }
109 }
110
111 static int
112 ifxmips_led_probe(struct platform_device *dev)
113 {
114 int i = 0;
115
116 ifxmips_led_setup_gpio();
117
118 writel(0, IFXMIPS_LED_AR);
119 writel(0, IFXMIPS_LED_CPU0);
120 writel(0, IFXMIPS_LED_CPU1);
121 writel(LED_CON0_SWU, IFXMIPS_LED_CON0);
122 writel(0, IFXMIPS_LED_CON1);
123
124 /* setup the clock edge that the shift register is triggered on */
125 writel(readl(IFXMIPS_LED_CON0) & ~IFXMIPS_LED_EDGE_MASK, IFXMIPS_LED_CON0);
126 writel(readl(IFXMIPS_LED_CON0) | IFXMIPS_LED_CLK_EDGE, IFXMIPS_LED_CON0);
127
128 /* per default leds 15-0 are set */
129 writel(IFXMIPS_LED_GROUP1 | IFXMIPS_LED_GROUP0, IFXMIPS_LED_CON1);
130
131 /* leds are update periodically by the FPID */
132 writel(readl(IFXMIPS_LED_CON1) & ~IFXMIPS_LED_UPD_MASK, IFXMIPS_LED_CON1);
133 writel(readl(IFXMIPS_LED_CON1) | IFXMIPS_LED_UPD_SRC_FPI, IFXMIPS_LED_CON1);
134
135 /* set led update speed */
136 writel(readl(IFXMIPS_LED_CON1) & ~IFXMIPS_LED_MASK, IFXMIPS_LED_CON1);
137 writel(readl(IFXMIPS_LED_CON1) | IFXMIPS_LED_SPEED, IFXMIPS_LED_CON1);
138
139 /* adsl 0 and 1 leds are updated by the arc */
140 writel(readl(IFXMIPS_LED_CON0) | IFXMIPS_LED_ADSL_SRC, IFXMIPS_LED_CON0);
141
142 /* per default, the leds are turned on */
143 ifxmips_pmu_enable(IFXMIPS_PMU_PWDCR_LED);
144
145 for(i = 0; i < IFXMIPS_MAX_LED; i++)
146 {
147 struct ifxmips_led *tmp = kzalloc(sizeof(struct ifxmips_led), GFP_KERNEL);
148 tmp->cdev.brightness_set = ifxmips_ledapi_set;
149 tmp->cdev.name = kmalloc(sizeof("ifxmips:led:00"), GFP_KERNEL);
150 sprintf(tmp->cdev.name, "ifxmips:led:%02d", i);
151 tmp->cdev.default_trigger = NULL;
152 tmp->bit = i;
153 led_classdev_register(&dev->dev, &tmp->cdev);
154 }
155
156 return 0;
157 }
158
159 static int
160 ifxmips_led_remove(struct platform_device *pdev)
161 {
162 return 0;
163 }
164
165 static struct
166 platform_driver ifxmips_led_driver = {
167 .probe = ifxmips_led_probe,
168 .remove = ifxmips_led_remove,
169 .driver = {
170 .name = DRVNAME,
171 .owner = THIS_MODULE,
172 },
173 };
174
175 int __init
176 ifxmips_led_init (void)
177 {
178 int ret = platform_driver_register(&ifxmips_led_driver);
179 if (ret)
180 printk(KERN_INFO "ifxmips_led: Error registering platfom driver!");
181
182 return ret;
183 }
184
185 void __exit
186 ifxmips_led_exit (void)
187 {
188 platform_driver_unregister(&ifxmips_led_driver);
189 }
190
191 module_init(ifxmips_led_init);
192 module_exit(ifxmips_led_exit);