Commit | Line | Data |
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7fdcef8a PR |
1 | /* |
2 | * LEDs driver for Freescale MC13783 | |
3 | * | |
4 | * Copyright (C) 2010 Philippe Rétornaz | |
5 | * | |
6 | * Based on leds-da903x: | |
7 | * Copyright (C) 2008 Compulab, Ltd. | |
8 | * Mike Rapoport <mike@compulab.co.il> | |
9 | * | |
10 | * Copyright (C) 2006-2008 Marvell International Ltd. | |
11 | * Eric Miao <eric.miao@marvell.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License version 2 as | |
15 | * published by the Free Software Foundation. | |
16 | */ | |
17 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/platform_device.h> | |
22 | #include <linux/leds.h> | |
23 | #include <linux/workqueue.h> | |
f3ca0782 | 24 | #include <linux/mfd/mc13xxx.h> |
7fdcef8a | 25 | |
9d263813 AS |
26 | #define MC13XXX_REG_LED_CONTROL(x) (51 + (x)) |
27 | ||
28 | struct mc13xxx_led_devtype { | |
29 | int led_min; | |
30 | int led_max; | |
31 | int num_regs; | |
32 | }; | |
33 | ||
34 | struct mc13xxx_led { | |
7fdcef8a PR |
35 | struct led_classdev cdev; |
36 | struct work_struct work; | |
f3ca0782 | 37 | struct mc13xxx *master; |
7fdcef8a PR |
38 | enum led_brightness new_brightness; |
39 | int id; | |
40 | }; | |
41 | ||
9d263813 AS |
42 | struct mc13xxx_leds { |
43 | struct mc13xxx_led_devtype *devtype; | |
44 | int num_leds; | |
45 | struct mc13xxx_led led[0]; | |
46 | }; | |
47 | ||
48 | static void mc13xxx_led_work(struct work_struct *work) | |
7fdcef8a | 49 | { |
9d263813 AS |
50 | struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work); |
51 | int reg, mask, value, bank, off, shift; | |
7fdcef8a PR |
52 | |
53 | switch (led->id) { | |
54 | case MC13783_LED_MD: | |
9d263813 AS |
55 | reg = MC13XXX_REG_LED_CONTROL(2); |
56 | shift = 9; | |
57 | mask = 0x0f; | |
58 | value = led->new_brightness >> 4; | |
7fdcef8a PR |
59 | break; |
60 | case MC13783_LED_AD: | |
9d263813 AS |
61 | reg = MC13XXX_REG_LED_CONTROL(2); |
62 | shift = 13; | |
63 | mask = 0x0f; | |
64 | value = led->new_brightness >> 4; | |
7fdcef8a PR |
65 | break; |
66 | case MC13783_LED_KP: | |
9d263813 AS |
67 | reg = MC13XXX_REG_LED_CONTROL(2); |
68 | shift = 17; | |
69 | mask = 0x0f; | |
70 | value = led->new_brightness >> 4; | |
7fdcef8a PR |
71 | break; |
72 | case MC13783_LED_R1: | |
73 | case MC13783_LED_G1: | |
74 | case MC13783_LED_B1: | |
75 | case MC13783_LED_R2: | |
76 | case MC13783_LED_G2: | |
77 | case MC13783_LED_B2: | |
78 | case MC13783_LED_R3: | |
79 | case MC13783_LED_G3: | |
80 | case MC13783_LED_B3: | |
81 | off = led->id - MC13783_LED_R1; | |
9d263813 AS |
82 | bank = off / 3; |
83 | reg = MC13XXX_REG_LED_CONTROL(3) + bank; | |
84 | shift = (off - bank * 3) * 5 + 6; | |
85 | value = led->new_brightness >> 3; | |
86 | mask = 0x1f; | |
7fdcef8a | 87 | break; |
9d263813 AS |
88 | default: |
89 | BUG(); | |
7fdcef8a PR |
90 | } |
91 | ||
f3ca0782 | 92 | mc13xxx_lock(led->master); |
9d263813 | 93 | mc13xxx_reg_rmw(led->master, reg, mask << shift, value << shift); |
f3ca0782 | 94 | mc13xxx_unlock(led->master); |
7fdcef8a PR |
95 | } |
96 | ||
9d263813 AS |
97 | static void mc13xxx_led_set(struct led_classdev *led_cdev, |
98 | enum led_brightness value) | |
7fdcef8a | 99 | { |
9d263813 AS |
100 | struct mc13xxx_led *led = |
101 | container_of(led_cdev, struct mc13xxx_led, cdev); | |
7fdcef8a | 102 | |
7fdcef8a PR |
103 | led->new_brightness = value; |
104 | schedule_work(&led->work); | |
105 | } | |
106 | ||
9d263813 | 107 | static int __init mc13xxx_led_setup(struct mc13xxx_led *led, int max_current) |
7fdcef8a | 108 | { |
9d263813 | 109 | int shift, mask, reg, ret, bank; |
7fdcef8a PR |
110 | |
111 | switch (led->id) { | |
112 | case MC13783_LED_MD: | |
9d263813 AS |
113 | reg = MC13XXX_REG_LED_CONTROL(2); |
114 | shift = 0; | |
115 | mask = 0x07; | |
7fdcef8a PR |
116 | break; |
117 | case MC13783_LED_AD: | |
9d263813 AS |
118 | reg = MC13XXX_REG_LED_CONTROL(2); |
119 | shift = 3; | |
120 | mask = 0x07; | |
7fdcef8a PR |
121 | break; |
122 | case MC13783_LED_KP: | |
9d263813 AS |
123 | reg = MC13XXX_REG_LED_CONTROL(2); |
124 | shift = 6; | |
125 | mask = 0x07; | |
7fdcef8a PR |
126 | break; |
127 | case MC13783_LED_R1: | |
128 | case MC13783_LED_G1: | |
129 | case MC13783_LED_B1: | |
130 | case MC13783_LED_R2: | |
131 | case MC13783_LED_G2: | |
132 | case MC13783_LED_B2: | |
133 | case MC13783_LED_R3: | |
134 | case MC13783_LED_G3: | |
135 | case MC13783_LED_B3: | |
9d263813 AS |
136 | bank = (led->id - MC13783_LED_R1) / 3; |
137 | reg = MC13XXX_REG_LED_CONTROL(3) + bank; | |
7fdcef8a | 138 | shift = ((led->id - MC13783_LED_R1) - bank * 3) * 2; |
9d263813 | 139 | mask = 0x03; |
7fdcef8a | 140 | break; |
9d263813 AS |
141 | default: |
142 | BUG(); | |
7fdcef8a PR |
143 | } |
144 | ||
f3ca0782 | 145 | mc13xxx_lock(led->master); |
f3ca0782 | 146 | ret = mc13xxx_reg_rmw(led->master, reg, mask << shift, |
9d263813 | 147 | max_current << shift); |
f3ca0782 | 148 | mc13xxx_unlock(led->master); |
7fdcef8a | 149 | |
7fdcef8a PR |
150 | return ret; |
151 | } | |
152 | ||
9d263813 | 153 | static int __init mc13xxx_led_probe(struct platform_device *pdev) |
7fdcef8a | 154 | { |
52b7ad3a | 155 | struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(&pdev->dev); |
9d263813 AS |
156 | struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent); |
157 | struct mc13xxx_led_devtype *devtype = | |
158 | (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data; | |
159 | struct mc13xxx_leds *leds; | |
160 | int i, id, num_leds, ret; | |
161 | u32 reg, init_led = 0; | |
162 | ||
163 | if (!pdata) { | |
164 | dev_err(&pdev->dev, "Missing platform data\n"); | |
7fdcef8a PR |
165 | return -ENODEV; |
166 | } | |
167 | ||
9d263813 AS |
168 | num_leds = pdata->num_leds; |
169 | ||
170 | if ((num_leds < 1) || | |
171 | (num_leds > (devtype->led_max - devtype->led_min + 1))) { | |
172 | dev_err(&pdev->dev, "Invalid LED count %d\n", num_leds); | |
7fdcef8a PR |
173 | return -EINVAL; |
174 | } | |
175 | ||
9d263813 AS |
176 | leds = devm_kzalloc(&pdev->dev, num_leds * sizeof(struct mc13xxx_led) + |
177 | sizeof(struct mc13xxx_leds), GFP_KERNEL); | |
178 | if (!leds) | |
7fdcef8a | 179 | return -ENOMEM; |
9d263813 AS |
180 | |
181 | leds->devtype = devtype; | |
182 | leds->num_leds = num_leds; | |
183 | platform_set_drvdata(pdev, leds); | |
184 | ||
185 | mc13xxx_lock(mcdev); | |
186 | for (i = 0; i < devtype->num_regs; i++) { | |
187 | reg = pdata->led_control[i]; | |
188 | WARN_ON(reg >= (1 << 24)); | |
189 | ret = mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), reg); | |
190 | if (ret) | |
191 | break; | |
7fdcef8a | 192 | } |
9d263813 | 193 | mc13xxx_unlock(mcdev); |
7fdcef8a | 194 | |
7fdcef8a | 195 | if (ret) { |
9d263813 | 196 | dev_err(&pdev->dev, "Unable to init LED driver\n"); |
a44cdd2c | 197 | return ret; |
7fdcef8a PR |
198 | } |
199 | ||
9d263813 AS |
200 | for (i = 0; i < num_leds; i++) { |
201 | const char *name, *trig; | |
202 | char max_current; | |
7fdcef8a | 203 | |
9d263813 AS |
204 | ret = -EINVAL; |
205 | ||
206 | id = pdata->led[i].id; | |
207 | name = pdata->led[i].name; | |
208 | trig = pdata->led[i].default_trigger; | |
209 | max_current = pdata->led[i].max_current; | |
210 | ||
211 | if ((id > devtype->led_max) || (id < devtype->led_min)) { | |
212 | dev_err(&pdev->dev, "Invalid ID %i\n", id); | |
213 | break; | |
7fdcef8a PR |
214 | } |
215 | ||
9d263813 AS |
216 | if (init_led & (1 << id)) { |
217 | dev_warn(&pdev->dev, | |
218 | "LED %i already initialized\n", id); | |
219 | break; | |
7fdcef8a PR |
220 | } |
221 | ||
9d263813 AS |
222 | init_led |= 1 << id; |
223 | leds->led[i].id = id; | |
224 | leds->led[i].master = mcdev; | |
225 | leds->led[i].cdev.name = name; | |
226 | leds->led[i].cdev.default_trigger = trig; | |
227 | leds->led[i].cdev.brightness_set = mc13xxx_led_set; | |
228 | leds->led[i].cdev.brightness = LED_OFF; | |
7fdcef8a | 229 | |
9d263813 | 230 | INIT_WORK(&leds->led[i].work, mc13xxx_led_work); |
7fdcef8a | 231 | |
9d263813 | 232 | ret = mc13xxx_led_setup(&leds->led[i], max_current); |
7fdcef8a | 233 | if (ret) { |
9d263813 AS |
234 | dev_err(&pdev->dev, "Unable to setup LED %i\n", id); |
235 | break; | |
7fdcef8a | 236 | } |
9d263813 AS |
237 | ret = led_classdev_register(pdev->dev.parent, |
238 | &leds->led[i].cdev); | |
7fdcef8a | 239 | if (ret) { |
9d263813 AS |
240 | dev_err(&pdev->dev, "Failed to register LED %i\n", id); |
241 | break; | |
7fdcef8a PR |
242 | } |
243 | } | |
244 | ||
9d263813 AS |
245 | if (ret) |
246 | while (--i >= 0) { | |
247 | led_classdev_unregister(&leds->led[i].cdev); | |
248 | cancel_work_sync(&leds->led[i].work); | |
249 | } | |
7fdcef8a | 250 | |
7fdcef8a PR |
251 | return ret; |
252 | } | |
253 | ||
9d263813 | 254 | static int mc13xxx_led_remove(struct platform_device *pdev) |
7fdcef8a | 255 | { |
9d263813 AS |
256 | struct mc13xxx *mcdev = dev_get_drvdata(pdev->dev.parent); |
257 | struct mc13xxx_leds *leds = platform_get_drvdata(pdev); | |
7fdcef8a PR |
258 | int i; |
259 | ||
9d263813 AS |
260 | for (i = 0; i < leds->num_leds; i++) { |
261 | led_classdev_unregister(&leds->led[i].cdev); | |
262 | cancel_work_sync(&leds->led[i].work); | |
7fdcef8a PR |
263 | } |
264 | ||
9d263813 AS |
265 | mc13xxx_lock(mcdev); |
266 | for (i = 0; i < leds->devtype->num_regs; i++) | |
267 | mc13xxx_reg_write(mcdev, MC13XXX_REG_LED_CONTROL(i), 0); | |
268 | mc13xxx_unlock(mcdev); | |
7fdcef8a | 269 | |
7fdcef8a PR |
270 | return 0; |
271 | } | |
272 | ||
9d263813 AS |
273 | static const struct mc13xxx_led_devtype mc13783_led_devtype = { |
274 | .led_min = MC13783_LED_MD, | |
275 | .led_max = MC13783_LED_B3, | |
276 | .num_regs = 6, | |
277 | }; | |
278 | ||
279 | static const struct platform_device_id mc13xxx_led_id_table[] = { | |
280 | { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, }, | |
281 | { } | |
282 | }; | |
283 | MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table); | |
284 | ||
285 | static struct platform_driver mc13xxx_led_driver = { | |
7fdcef8a | 286 | .driver = { |
9d263813 | 287 | .name = "mc13xxx-led", |
7fdcef8a PR |
288 | .owner = THIS_MODULE, |
289 | }, | |
9d263813 AS |
290 | .remove = mc13xxx_led_remove, |
291 | .id_table = mc13xxx_led_id_table, | |
7fdcef8a | 292 | }; |
9d263813 | 293 | module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe); |
7fdcef8a | 294 | |
9d263813 | 295 | MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC"); |
7fdcef8a PR |
296 | MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>"); |
297 | MODULE_LICENSE("GPL"); |