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