Commit | Line | Data |
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0a2f915b HZ |
1 | /* |
2 | * LED driver for Marvell 88PM860x | |
3 | * | |
4 | * Copyright (C) 2009 Marvell International Ltd. | |
5 | * Haojian Zhuang <haojian.zhuang@marvell.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/i2c.h> | |
17 | #include <linux/leds.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
0a2f915b HZ |
19 | #include <linux/workqueue.h> |
20 | #include <linux/mfd/88pm860x.h> | |
21 | ||
22 | #define LED_PWM_SHIFT (3) | |
23 | #define LED_PWM_MASK (0x1F) | |
24 | #define LED_CURRENT_MASK (0x07 << 5) | |
25 | ||
26 | #define LED_BLINK_ON_MASK (0x07) | |
0a2f915b HZ |
27 | #define LED_BLINK_MASK (0x7F) |
28 | ||
29 | #define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66) | |
0a2f915b HZ |
30 | #define LED_BLINK_ON_MIN LED_BLINK_ON(0) |
31 | #define LED_BLINK_ON_MAX LED_BLINK_ON(0x7) | |
f5d59fc5 | 32 | #define LED_ON_CONTINUOUS (0x0F << 3) |
0a2f915b | 33 | #define LED_TO_ON(x) ((x - 66) / 66) |
0a2f915b HZ |
34 | |
35 | #define LED1_BLINK_EN (1 << 1) | |
36 | #define LED2_BLINK_EN (1 << 2) | |
37 | ||
0a2f915b HZ |
38 | struct pm860x_led { |
39 | struct led_classdev cdev; | |
40 | struct i2c_client *i2c; | |
41 | struct work_struct work; | |
42 | struct pm860x_chip *chip; | |
43 | struct mutex lock; | |
44 | char name[MFD_NAME_SIZE]; | |
45 | ||
46 | int port; | |
47 | int iset; | |
0a2f915b HZ |
48 | unsigned char brightness; |
49 | unsigned char current_brightness; | |
50 | ||
51 | int blink_data; | |
52 | int blink_time; | |
53 | int blink_on; | |
54 | int blink_off; | |
55 | }; | |
56 | ||
57 | /* return offset of color register */ | |
58 | static inline int __led_off(int port) | |
59 | { | |
60 | int ret = -EINVAL; | |
61 | ||
62 | switch (port) { | |
63 | case PM8606_LED1_RED: | |
64 | case PM8606_LED1_GREEN: | |
65 | case PM8606_LED1_BLUE: | |
66 | ret = port - PM8606_LED1_RED + PM8606_RGB1B; | |
67 | break; | |
68 | case PM8606_LED2_RED: | |
69 | case PM8606_LED2_GREEN: | |
70 | case PM8606_LED2_BLUE: | |
71 | ret = port - PM8606_LED2_RED + PM8606_RGB2B; | |
72 | break; | |
73 | } | |
74 | return ret; | |
75 | } | |
76 | ||
77 | /* return offset of blink register */ | |
78 | static inline int __blink_off(int port) | |
79 | { | |
80 | int ret = -EINVAL; | |
81 | ||
82 | switch (port) { | |
83 | case PM8606_LED1_RED: | |
84 | case PM8606_LED1_GREEN: | |
85 | case PM8606_LED1_BLUE: | |
86 | ret = PM8606_RGB1A; | |
f5d59fc5 | 87 | break; |
0a2f915b HZ |
88 | case PM8606_LED2_RED: |
89 | case PM8606_LED2_GREEN: | |
90 | case PM8606_LED2_BLUE: | |
91 | ret = PM8606_RGB2A; | |
f5d59fc5 | 92 | break; |
0a2f915b HZ |
93 | } |
94 | return ret; | |
95 | } | |
96 | ||
97 | static inline int __blink_ctl_mask(int port) | |
98 | { | |
99 | int ret = -EINVAL; | |
100 | ||
101 | switch (port) { | |
102 | case PM8606_LED1_RED: | |
103 | case PM8606_LED1_GREEN: | |
104 | case PM8606_LED1_BLUE: | |
105 | ret = LED1_BLINK_EN; | |
106 | break; | |
107 | case PM8606_LED2_RED: | |
108 | case PM8606_LED2_GREEN: | |
109 | case PM8606_LED2_BLUE: | |
110 | ret = LED2_BLINK_EN; | |
111 | break; | |
112 | } | |
113 | return ret; | |
114 | } | |
115 | ||
f5d59fc5 | 116 | static void pm860x_led_work(struct work_struct *work) |
0a2f915b | 117 | { |
0a2f915b | 118 | |
f5d59fc5 HZ |
119 | struct pm860x_led *led; |
120 | struct pm860x_chip *chip; | |
3154c344 HZ |
121 | unsigned char buf[3]; |
122 | int mask, ret; | |
f5d59fc5 HZ |
123 | |
124 | led = container_of(work, struct pm860x_led, work); | |
125 | chip = led->chip; | |
0a2f915b | 126 | mutex_lock(&led->lock); |
f5d59fc5 HZ |
127 | if ((led->current_brightness == 0) && led->brightness) { |
128 | if (led->iset) { | |
129 | pm860x_set_bits(led->i2c, __led_off(led->port), | |
130 | LED_CURRENT_MASK, led->iset); | |
0a2f915b | 131 | } |
3154c344 HZ |
132 | pm860x_set_bits(led->i2c, __blink_off(led->port), |
133 | LED_BLINK_MASK, LED_ON_CONTINUOUS); | |
0a2f915b | 134 | mask = __blink_ctl_mask(led->port); |
f5d59fc5 | 135 | pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask); |
0a2f915b | 136 | } |
f5d59fc5 HZ |
137 | pm860x_set_bits(led->i2c, __led_off(led->port), LED_PWM_MASK, |
138 | led->brightness); | |
3154c344 HZ |
139 | |
140 | if (led->brightness == 0) { | |
141 | pm860x_bulk_read(led->i2c, __led_off(led->port), 3, buf); | |
142 | ret = buf[0] & LED_PWM_MASK; | |
143 | ret |= buf[1] & LED_PWM_MASK; | |
144 | ret |= buf[2] & LED_PWM_MASK; | |
145 | if (ret == 0) { | |
146 | /* unset current since no led is lighting */ | |
147 | pm860x_set_bits(led->i2c, __led_off(led->port), | |
148 | LED_CURRENT_MASK, 0); | |
149 | mask = __blink_ctl_mask(led->port); | |
150 | pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, 0); | |
151 | } | |
152 | } | |
f5d59fc5 HZ |
153 | led->current_brightness = led->brightness; |
154 | dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n", | |
155 | __led_off(led->port), led->brightness); | |
0a2f915b | 156 | mutex_unlock(&led->lock); |
0a2f915b HZ |
157 | } |
158 | ||
159 | static void pm860x_led_set(struct led_classdev *cdev, | |
160 | enum led_brightness value) | |
161 | { | |
162 | struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev); | |
163 | ||
0a2f915b | 164 | data->brightness = value >> 3; |
0a2f915b | 165 | schedule_work(&data->work); |
0a2f915b HZ |
166 | } |
167 | ||
0a2f915b HZ |
168 | static int pm860x_led_probe(struct platform_device *pdev) |
169 | { | |
170 | struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
0a2f915b HZ |
171 | struct pm860x_led_pdata *pdata; |
172 | struct pm860x_led *data; | |
173 | struct resource *res; | |
174 | int ret; | |
175 | ||
176 | res = platform_get_resource(pdev, IORESOURCE_IO, 0); | |
177 | if (res == NULL) { | |
178 | dev_err(&pdev->dev, "No I/O resource!\n"); | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
07259a70 | 182 | pdata = pdev->dev.platform_data; |
3154c344 | 183 | if (pdata == NULL) { |
f5d59fc5 | 184 | dev_err(&pdev->dev, "No platform data!\n"); |
98652efc CF |
185 | return -EINVAL; |
186 | } | |
0a2f915b HZ |
187 | |
188 | data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL); | |
189 | if (data == NULL) | |
190 | return -ENOMEM; | |
3154c344 | 191 | strncpy(data->name, res->name, MFD_NAME_SIZE - 1); |
0a2f915b HZ |
192 | dev_set_drvdata(&pdev->dev, data); |
193 | data->chip = chip; | |
194 | data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion; | |
195 | data->iset = pdata->iset; | |
3154c344 | 196 | data->port = pdata->flags; |
98652efc CF |
197 | if (data->port < 0) { |
198 | dev_err(&pdev->dev, "check device failed\n"); | |
199 | kfree(data); | |
0a2f915b | 200 | return -EINVAL; |
98652efc | 201 | } |
0a2f915b HZ |
202 | |
203 | data->current_brightness = 0; | |
204 | data->cdev.name = data->name; | |
205 | data->cdev.brightness_set = pm860x_led_set; | |
0a2f915b HZ |
206 | mutex_init(&data->lock); |
207 | INIT_WORK(&data->work, pm860x_led_work); | |
208 | ||
209 | ret = led_classdev_register(chip->dev, &data->cdev); | |
210 | if (ret < 0) { | |
211 | dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); | |
212 | goto out; | |
213 | } | |
3154c344 | 214 | pm860x_led_set(&data->cdev, 0); |
0a2f915b HZ |
215 | return 0; |
216 | out: | |
217 | kfree(data); | |
218 | return ret; | |
219 | } | |
220 | ||
221 | static int pm860x_led_remove(struct platform_device *pdev) | |
222 | { | |
223 | struct pm860x_led *data = platform_get_drvdata(pdev); | |
224 | ||
225 | led_classdev_unregister(&data->cdev); | |
226 | kfree(data); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static struct platform_driver pm860x_led_driver = { | |
232 | .driver = { | |
233 | .name = "88pm860x-led", | |
234 | .owner = THIS_MODULE, | |
235 | }, | |
236 | .probe = pm860x_led_probe, | |
237 | .remove = pm860x_led_remove, | |
238 | }; | |
239 | ||
240 | static int __devinit pm860x_led_init(void) | |
241 | { | |
242 | return platform_driver_register(&pm860x_led_driver); | |
243 | } | |
244 | module_init(pm860x_led_init); | |
245 | ||
246 | static void __devexit pm860x_led_exit(void) | |
247 | { | |
248 | platform_driver_unregister(&pm860x_led_driver); | |
249 | } | |
250 | module_exit(pm860x_led_exit); | |
251 | ||
252 | MODULE_DESCRIPTION("LED driver for Marvell PM860x"); | |
253 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | |
254 | MODULE_LICENSE("GPL"); | |
255 | MODULE_ALIAS("platform:88pm860x-led"); |