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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>
19#include <linux/slab.h>
20#include <linux/module.h>
21
22
23static const int isink_cur[] = {
24 4,
25 5,
26 6,
27 7,
28 8,
29 10,
30 11,
31 14,
32 16,
33 19,
34 23,
35 27,
36 32,
37 39,
38 46,
39 54,
40 65,
41 77,
42 92,
43 109,
44 130,
45 154,
46 183,
47 218,
48 259,
49 308,
50 367,
51 436,
52 518,
53 616,
54 733,
55 872,
56 1037,
57 1233,
58 1466,
59 1744,
60 2073,
61 2466,
62 2933,
63 3487,
64 4147,
65 4932,
66 5865,
67 6975,
68 8294,
69 9864,
70 11730,
71 13949,
72 16589,
73 19728,
74 23460,
75 27899,
76 33178,
77 39455,
78 46920,
79 55798,
80 66355,
81 78910,
82 93840,
83 111596,
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
93static 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
116static 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);
132 regulator_enable(led->dcdc);
133 return;
134 }
135
136 led->enabled = 0;
137}
138
139static void led_work(struct work_struct *work)
140{
141 struct wm8350_led *led = container_of(work, struct wm8350_led, work);
142 int ret;
143 int uA;
144 unsigned long flags;
145
146 mutex_lock(&led->mutex);
147
148 spin_lock_irqsave(&led->value_lock, flags);
149
150 if (led->value == LED_OFF) {
151 spin_unlock_irqrestore(&led->value_lock, flags);
152 wm8350_led_disable(led);
153 goto out;
154 }
155
156
157
158
159
160
161 uA = (led->max_uA_index * led->value) / LED_FULL;
162 spin_unlock_irqrestore(&led->value_lock, flags);
163 BUG_ON(uA >= ARRAY_SIZE(isink_cur));
164
165 ret = regulator_set_current_limit(led->isink, isink_cur[uA],
166 isink_cur[uA]);
167 if (ret != 0)
168 dev_err(led->cdev.dev, "Failed to set %duA: %d\n",
169 isink_cur[uA], ret);
170
171 wm8350_led_enable(led);
172
173out:
174 mutex_unlock(&led->mutex);
175}
176
177static void wm8350_led_set(struct led_classdev *led_cdev,
178 enum led_brightness value)
179{
180 struct wm8350_led *led = to_wm8350_led(led_cdev);
181 unsigned long flags;
182
183 spin_lock_irqsave(&led->value_lock, flags);
184 led->value = value;
185 schedule_work(&led->work);
186 spin_unlock_irqrestore(&led->value_lock, flags);
187}
188
189static void wm8350_led_shutdown(struct platform_device *pdev)
190{
191 struct wm8350_led *led = platform_get_drvdata(pdev);
192
193 mutex_lock(&led->mutex);
194 led->value = LED_OFF;
195 wm8350_led_disable(led);
196 mutex_unlock(&led->mutex);
197}
198
199static int wm8350_led_probe(struct platform_device *pdev)
200{
201 struct regulator *isink, *dcdc;
202 struct wm8350_led *led;
203 struct wm8350_led_platform_data *pdata = pdev->dev.platform_data;
204 int i;
205
206 if (pdata == NULL) {
207 dev_err(&pdev->dev, "no platform data\n");
208 return -ENODEV;
209 }
210
211 if (pdata->max_uA < isink_cur[0]) {
212 dev_err(&pdev->dev, "Invalid maximum current %duA\n",
213 pdata->max_uA);
214 return -EINVAL;
215 }
216
217 isink = devm_regulator_get(&pdev->dev, "led_isink");
218 if (IS_ERR(isink)) {
219 dev_err(&pdev->dev, "%s: can't get ISINK\n", __func__);
220 return PTR_ERR(isink);
221 }
222
223 dcdc = devm_regulator_get(&pdev->dev, "led_vcc");
224 if (IS_ERR(dcdc)) {
225 dev_err(&pdev->dev, "%s: can't get DCDC\n", __func__);
226 return PTR_ERR(dcdc);
227 }
228
229 led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
230 if (led == NULL)
231 return -ENOMEM;
232
233 led->cdev.brightness_set = wm8350_led_set;
234 led->cdev.default_trigger = pdata->default_trigger;
235 led->cdev.name = pdata->name;
236 led->cdev.flags |= LED_CORE_SUSPENDRESUME;
237 led->enabled = regulator_is_enabled(isink);
238 led->isink = isink;
239 led->dcdc = dcdc;
240
241 for (i = 0; i < ARRAY_SIZE(isink_cur) - 1; i++)
242 if (isink_cur[i] >= pdata->max_uA)
243 break;
244 led->max_uA_index = i;
245 if (pdata->max_uA != isink_cur[i])
246 dev_warn(&pdev->dev,
247 "Maximum current %duA is not directly supported,"
248 " check platform data\n",
249 pdata->max_uA);
250
251 spin_lock_init(&led->value_lock);
252 mutex_init(&led->mutex);
253 INIT_WORK(&led->work, led_work);
254 led->value = LED_OFF;
255 platform_set_drvdata(pdev, led);
256
257 return led_classdev_register(&pdev->dev, &led->cdev);
258}
259
260static int wm8350_led_remove(struct platform_device *pdev)
261{
262 struct wm8350_led *led = platform_get_drvdata(pdev);
263
264 led_classdev_unregister(&led->cdev);
265 flush_work(&led->work);
266 wm8350_led_disable(led);
267 return 0;
268}
269
270static struct platform_driver wm8350_led_driver = {
271 .driver = {
272 .name = "wm8350-led",
273 .owner = THIS_MODULE,
274 },
275 .probe = wm8350_led_probe,
276 .remove = wm8350_led_remove,
277 .shutdown = wm8350_led_shutdown,
278};
279
280module_platform_driver(wm8350_led_driver);
281
282MODULE_AUTHOR("Mark Brown");
283MODULE_DESCRIPTION("WM8350 LED driver");
284MODULE_LICENSE("GPL");
285MODULE_ALIAS("platform:wm8350-led");
286
