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0081e802 MB |
1 | /* |
2 | * LED driver for WM8350 driven LEDS. | |
3 | * | |
4 | * Copyright(C) 2007, 2008 Wolfson Microelectronics PLC. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/leds.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/mfd/wm8350/pmic.h> | |
18 | #include <linux/regulator/consumer.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
54f4dedb | 20 | #include <linux/module.h> |
0081e802 MB |
21 | |
22 | /* Microamps */ | |
23 | static const int isink_cur[] = { | |
24 | 4, | |
25 | 5, | |
26 | 6, | |
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84 | 132710, | |
85 | 157820, | |
86 | 187681, | |
87 | 223191 | |
88 | }; | |
89 | ||
90 | #define to_wm8350_led(led_cdev) \ | |
91 | container_of(led_cdev, struct wm8350_led, cdev) | |
92 | ||
93 | static void wm8350_led_enable(struct wm8350_led *led) | |
94 | { | |
95 | int ret; | |
96 | ||
97 | if (led->enabled) | |
98 | return; | |
99 | ||
100 | ret = regulator_enable(led->isink); | |
101 | if (ret != 0) { | |
102 | dev_err(led->cdev.dev, "Failed to enable ISINK: %d\n", ret); | |
103 | return; | |
104 | } | |
105 | ||
106 | ret = regulator_enable(led->dcdc); | |
107 | if (ret != 0) { | |
108 | dev_err(led->cdev.dev, "Failed to enable DCDC: %d\n", ret); | |
109 | regulator_disable(led->isink); | |
110 | return; | |
111 | } | |
112 | ||
113 | led->enabled = 1; | |
114 | } | |
115 | ||
116 | static void wm8350_led_disable(struct wm8350_led *led) | |
117 | { | |
118 | int ret; | |
119 | ||
120 | if (!led->enabled) | |
121 | return; | |
122 | ||
123 | ret = regulator_disable(led->dcdc); | |
124 | if (ret != 0) { | |
125 | dev_err(led->cdev.dev, "Failed to disable DCDC: %d\n", ret); | |
126 | return; | |
127 | } | |
128 | ||
129 | ret = regulator_disable(led->isink); | |
130 | if (ret != 0) { | |
131 | dev_err(led->cdev.dev, "Failed to disable ISINK: %d\n", ret); | |
d67eb8e6 MB |
132 | ret = regulator_enable(led->dcdc); |
133 | if (ret != 0) | |
134 | dev_err(led->cdev.dev, "Failed to reenable DCDC: %d\n", | |
135 | ret); | |
0081e802 MB |
136 | return; |
137 | } | |
138 | ||
139 | led->enabled = 0; | |
140 | } | |
141 | ||
142 | static void led_work(struct work_struct *work) | |
143 | { | |
144 | struct wm8350_led *led = container_of(work, struct wm8350_led, work); | |
145 | int ret; | |
146 | int uA; | |
147 | unsigned long flags; | |
148 | ||
149 | mutex_lock(&led->mutex); | |
150 | ||
151 | spin_lock_irqsave(&led->value_lock, flags); | |
152 | ||
153 | if (led->value == LED_OFF) { | |
154 | spin_unlock_irqrestore(&led->value_lock, flags); | |
155 | wm8350_led_disable(led); | |
156 | goto out; | |
157 | } | |
158 | ||
159 | /* This scales linearly into the index of valid current | |
160 | * settings which results in a linear scaling of perceived | |
161 | * brightness due to the non-linear current settings provided | |
162 | * by the hardware. | |
163 | */ | |
164 | uA = (led->max_uA_index * led->value) / LED_FULL; | |
165 | spin_unlock_irqrestore(&led->value_lock, flags); | |
166 | BUG_ON(uA >= ARRAY_SIZE(isink_cur)); | |
167 | ||
168 | ret = regulator_set_current_limit(led->isink, isink_cur[uA], | |
169 | isink_cur[uA]); | |
170 | if (ret != 0) | |
171 | dev_err(led->cdev.dev, "Failed to set %duA: %d\n", | |
172 | isink_cur[uA], ret); | |
173 | ||
174 | wm8350_led_enable(led); | |
175 | ||
176 | out: | |
177 | mutex_unlock(&led->mutex); | |
178 | } | |
179 | ||
180 | static void wm8350_led_set(struct led_classdev *led_cdev, | |
181 | enum led_brightness value) | |
182 | { | |
183 | struct wm8350_led *led = to_wm8350_led(led_cdev); | |
184 | unsigned long flags; | |
185 | ||
186 | spin_lock_irqsave(&led->value_lock, flags); | |
187 | led->value = value; | |
188 | schedule_work(&led->work); | |
189 | spin_unlock_irqrestore(&led->value_lock, flags); | |
190 | } | |
191 | ||
0081e802 MB |
192 | static void wm8350_led_shutdown(struct platform_device *pdev) |
193 | { | |
194 | struct wm8350_led *led = platform_get_drvdata(pdev); | |
195 | ||
196 | mutex_lock(&led->mutex); | |
197 | led->value = LED_OFF; | |
198 | wm8350_led_disable(led); | |
199 | mutex_unlock(&led->mutex); | |
200 | } | |
201 | ||
202 | static int wm8350_led_probe(struct platform_device *pdev) | |
203 | { | |
204 | struct regulator *isink, *dcdc; | |
205 | struct wm8350_led *led; | |
87aae1ea | 206 | struct wm8350_led_platform_data *pdata = dev_get_platdata(&pdev->dev); |
490dcee9 | 207 | int i; |
0081e802 MB |
208 | |
209 | if (pdata == NULL) { | |
210 | dev_err(&pdev->dev, "no platform data\n"); | |
211 | return -ENODEV; | |
212 | } | |
213 | ||
214 | if (pdata->max_uA < isink_cur[0]) { | |
215 | dev_err(&pdev->dev, "Invalid maximum current %duA\n", | |
216 | pdata->max_uA); | |
217 | return -EINVAL; | |
218 | } | |
219 | ||
490dcee9 | 220 | isink = devm_regulator_get(&pdev->dev, "led_isink"); |
0081e802 | 221 | if (IS_ERR(isink)) { |
b75d2802 | 222 | dev_err(&pdev->dev, "%s: can't get ISINK\n", __func__); |
0081e802 MB |
223 | return PTR_ERR(isink); |
224 | } | |
225 | ||
490dcee9 | 226 | dcdc = devm_regulator_get(&pdev->dev, "led_vcc"); |
0081e802 | 227 | if (IS_ERR(dcdc)) { |
b75d2802 | 228 | dev_err(&pdev->dev, "%s: can't get DCDC\n", __func__); |
490dcee9 | 229 | return PTR_ERR(dcdc); |
0081e802 MB |
230 | } |
231 | ||
c957b614 | 232 | led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); |
490dcee9 AL |
233 | if (led == NULL) |
234 | return -ENOMEM; | |
0081e802 MB |
235 | |
236 | led->cdev.brightness_set = wm8350_led_set; | |
237 | led->cdev.default_trigger = pdata->default_trigger; | |
238 | led->cdev.name = pdata->name; | |
859cb7f2 | 239 | led->cdev.flags |= LED_CORE_SUSPENDRESUME; |
0081e802 MB |
240 | led->enabled = regulator_is_enabled(isink); |
241 | led->isink = isink; | |
242 | led->dcdc = dcdc; | |
243 | ||
244 | for (i = 0; i < ARRAY_SIZE(isink_cur) - 1; i++) | |
245 | if (isink_cur[i] >= pdata->max_uA) | |
246 | break; | |
247 | led->max_uA_index = i; | |
248 | if (pdata->max_uA != isink_cur[i]) | |
249 | dev_warn(&pdev->dev, | |
250 | "Maximum current %duA is not directly supported," | |
251 | " check platform data\n", | |
252 | pdata->max_uA); | |
253 | ||
254 | spin_lock_init(&led->value_lock); | |
255 | mutex_init(&led->mutex); | |
256 | INIT_WORK(&led->work, led_work); | |
257 | led->value = LED_OFF; | |
258 | platform_set_drvdata(pdev, led); | |
259 | ||
490dcee9 | 260 | return led_classdev_register(&pdev->dev, &led->cdev); |
0081e802 MB |
261 | } |
262 | ||
263 | static int wm8350_led_remove(struct platform_device *pdev) | |
264 | { | |
265 | struct wm8350_led *led = platform_get_drvdata(pdev); | |
266 | ||
267 | led_classdev_unregister(&led->cdev); | |
43829731 | 268 | flush_work(&led->work); |
0081e802 | 269 | wm8350_led_disable(led); |
0081e802 MB |
270 | return 0; |
271 | } | |
272 | ||
273 | static struct platform_driver wm8350_led_driver = { | |
274 | .driver = { | |
275 | .name = "wm8350-led", | |
276 | .owner = THIS_MODULE, | |
277 | }, | |
278 | .probe = wm8350_led_probe, | |
279 | .remove = wm8350_led_remove, | |
280 | .shutdown = wm8350_led_shutdown, | |
0081e802 MB |
281 | }; |
282 | ||
892a8843 | 283 | module_platform_driver(wm8350_led_driver); |
0081e802 MB |
284 | |
285 | MODULE_AUTHOR("Mark Brown"); | |
286 | MODULE_DESCRIPTION("WM8350 LED driver"); | |
287 | MODULE_LICENSE("GPL"); | |
288 | MODULE_ALIAS("platform:wm8350-led"); |