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c746b551 MB |
1 | /* |
2 | * LED driver for WM831x status LEDs | |
3 | * | |
4 | * Copyright(C) 2009 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> | |
c746b551 | 13 | #include <linux/platform_device.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
c746b551 MB |
15 | #include <linux/leds.h> |
16 | #include <linux/err.h> | |
17 | #include <linux/mfd/wm831x/core.h> | |
18 | #include <linux/mfd/wm831x/pdata.h> | |
19 | #include <linux/mfd/wm831x/status.h> | |
54f4dedb | 20 | #include <linux/module.h> |
c746b551 MB |
21 | |
22 | ||
23 | struct wm831x_status { | |
24 | struct led_classdev cdev; | |
25 | struct wm831x *wm831x; | |
26 | struct work_struct work; | |
27 | struct mutex mutex; | |
28 | ||
29 | spinlock_t value_lock; | |
30 | int reg; /* Control register */ | |
31 | int reg_val; /* Control register value */ | |
32 | ||
33 | int blink; | |
34 | int blink_time; | |
35 | int blink_cyc; | |
36 | int src; | |
37 | enum led_brightness brightness; | |
38 | }; | |
39 | ||
40 | #define to_wm831x_status(led_cdev) \ | |
41 | container_of(led_cdev, struct wm831x_status, cdev) | |
42 | ||
43 | static void wm831x_status_work(struct work_struct *work) | |
44 | { | |
45 | struct wm831x_status *led = container_of(work, struct wm831x_status, | |
46 | work); | |
47 | unsigned long flags; | |
48 | ||
49 | mutex_lock(&led->mutex); | |
50 | ||
51 | led->reg_val &= ~(WM831X_LED_SRC_MASK | WM831X_LED_MODE_MASK | | |
52 | WM831X_LED_DUTY_CYC_MASK | WM831X_LED_DUR_MASK); | |
53 | ||
54 | spin_lock_irqsave(&led->value_lock, flags); | |
55 | ||
56 | led->reg_val |= led->src << WM831X_LED_SRC_SHIFT; | |
57 | if (led->blink) { | |
58 | led->reg_val |= 2 << WM831X_LED_MODE_SHIFT; | |
59 | led->reg_val |= led->blink_time << WM831X_LED_DUR_SHIFT; | |
60 | led->reg_val |= led->blink_cyc; | |
61 | } else { | |
62 | if (led->brightness != LED_OFF) | |
63 | led->reg_val |= 1 << WM831X_LED_MODE_SHIFT; | |
64 | } | |
65 | ||
66 | spin_unlock_irqrestore(&led->value_lock, flags); | |
67 | ||
68 | wm831x_reg_write(led->wm831x, led->reg, led->reg_val); | |
69 | ||
70 | mutex_unlock(&led->mutex); | |
71 | } | |
72 | ||
73 | static void wm831x_status_set(struct led_classdev *led_cdev, | |
74 | enum led_brightness value) | |
75 | { | |
76 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
77 | unsigned long flags; | |
78 | ||
79 | spin_lock_irqsave(&led->value_lock, flags); | |
80 | led->brightness = value; | |
81 | if (value == LED_OFF) | |
82 | led->blink = 0; | |
83 | schedule_work(&led->work); | |
84 | spin_unlock_irqrestore(&led->value_lock, flags); | |
85 | } | |
86 | ||
87 | static int wm831x_status_blink_set(struct led_classdev *led_cdev, | |
88 | unsigned long *delay_on, | |
89 | unsigned long *delay_off) | |
90 | { | |
91 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
92 | unsigned long flags; | |
93 | int ret = 0; | |
94 | ||
95 | /* Pick some defaults if we've not been given times */ | |
96 | if (*delay_on == 0 && *delay_off == 0) { | |
97 | *delay_on = 250; | |
98 | *delay_off = 250; | |
99 | } | |
100 | ||
101 | spin_lock_irqsave(&led->value_lock, flags); | |
102 | ||
103 | /* We only have a limited selection of settings, see if we can | |
104 | * support the configuration we're being given */ | |
105 | switch (*delay_on) { | |
106 | case 1000: | |
107 | led->blink_time = 0; | |
108 | break; | |
109 | case 250: | |
110 | led->blink_time = 1; | |
111 | break; | |
112 | case 125: | |
113 | led->blink_time = 2; | |
114 | break; | |
115 | case 62: | |
116 | case 63: | |
117 | /* Actually 62.5ms */ | |
118 | led->blink_time = 3; | |
119 | break; | |
120 | default: | |
121 | ret = -EINVAL; | |
122 | break; | |
123 | } | |
124 | ||
125 | if (ret == 0) { | |
126 | switch (*delay_off / *delay_on) { | |
127 | case 1: | |
128 | led->blink_cyc = 0; | |
129 | break; | |
130 | case 3: | |
131 | led->blink_cyc = 1; | |
132 | break; | |
133 | case 4: | |
134 | led->blink_cyc = 2; | |
135 | break; | |
136 | case 8: | |
137 | led->blink_cyc = 3; | |
138 | break; | |
139 | default: | |
140 | ret = -EINVAL; | |
141 | break; | |
142 | } | |
143 | } | |
144 | ||
145 | if (ret == 0) | |
146 | led->blink = 1; | |
147 | else | |
148 | led->blink = 0; | |
149 | ||
150 | /* Always update; if we fail turn off blinking since we expect | |
151 | * a software fallback. */ | |
152 | schedule_work(&led->work); | |
153 | ||
154 | spin_unlock_irqrestore(&led->value_lock, flags); | |
155 | ||
156 | return ret; | |
157 | } | |
158 | ||
8a4529a3 | 159 | static const char * const led_src_texts[] = { |
c746b551 MB |
160 | "otp", |
161 | "power", | |
162 | "charger", | |
163 | "soft", | |
164 | }; | |
165 | ||
166 | static ssize_t wm831x_status_src_show(struct device *dev, | |
167 | struct device_attribute *attr, char *buf) | |
168 | { | |
169 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
170 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
171 | int i; | |
172 | ssize_t ret = 0; | |
173 | ||
174 | mutex_lock(&led->mutex); | |
175 | ||
176 | for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) | |
177 | if (i == led->src) | |
178 | ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]); | |
179 | else | |
180 | ret += sprintf(&buf[ret], "%s ", led_src_texts[i]); | |
181 | ||
182 | mutex_unlock(&led->mutex); | |
183 | ||
184 | ret += sprintf(&buf[ret], "\n"); | |
185 | ||
186 | return ret; | |
187 | } | |
188 | ||
189 | static ssize_t wm831x_status_src_store(struct device *dev, | |
190 | struct device_attribute *attr, | |
191 | const char *buf, size_t size) | |
192 | { | |
193 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
194 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
195 | char name[20]; | |
196 | int i; | |
197 | size_t len; | |
198 | ||
199 | name[sizeof(name) - 1] = '\0'; | |
200 | strncpy(name, buf, sizeof(name) - 1); | |
201 | len = strlen(name); | |
202 | ||
203 | if (len && name[len - 1] == '\n') | |
204 | name[len - 1] = '\0'; | |
205 | ||
206 | for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) { | |
207 | if (!strcmp(name, led_src_texts[i])) { | |
208 | mutex_lock(&led->mutex); | |
209 | ||
210 | led->src = i; | |
211 | schedule_work(&led->work); | |
212 | ||
213 | mutex_unlock(&led->mutex); | |
214 | } | |
215 | } | |
216 | ||
217 | return size; | |
218 | } | |
219 | ||
220 | static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store); | |
221 | ||
b2015ed5 JH |
222 | static struct attribute *wm831x_status_attrs[] = { |
223 | &dev_attr_src.attr, | |
224 | NULL | |
225 | }; | |
226 | ATTRIBUTE_GROUPS(wm831x_status); | |
227 | ||
c746b551 MB |
228 | static int wm831x_status_probe(struct platform_device *pdev) |
229 | { | |
230 | struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); | |
231 | struct wm831x_pdata *chip_pdata; | |
232 | struct wm831x_status_pdata pdata; | |
233 | struct wm831x_status *drvdata; | |
234 | struct resource *res; | |
235 | int id = pdev->id % ARRAY_SIZE(chip_pdata->status); | |
236 | int ret; | |
237 | ||
61abeba5 | 238 | res = platform_get_resource(pdev, IORESOURCE_REG, 0); |
c746b551 | 239 | if (res == NULL) { |
61abeba5 | 240 | dev_err(&pdev->dev, "No register resource\n"); |
b2015ed5 | 241 | return -EINVAL; |
c746b551 MB |
242 | } |
243 | ||
1713cb9d MB |
244 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_status), |
245 | GFP_KERNEL); | |
c746b551 MB |
246 | if (!drvdata) |
247 | return -ENOMEM; | |
84196a2f | 248 | platform_set_drvdata(pdev, drvdata); |
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249 | |
250 | drvdata->wm831x = wm831x; | |
251 | drvdata->reg = res->start; | |
252 | ||
87aae1ea JH |
253 | if (dev_get_platdata(wm831x->dev)) |
254 | chip_pdata = dev_get_platdata(wm831x->dev); | |
c746b551 MB |
255 | else |
256 | chip_pdata = NULL; | |
257 | ||
258 | memset(&pdata, 0, sizeof(pdata)); | |
259 | if (chip_pdata && chip_pdata->status[id]) | |
260 | memcpy(&pdata, chip_pdata->status[id], sizeof(pdata)); | |
261 | else | |
262 | pdata.name = dev_name(&pdev->dev); | |
263 | ||
264 | mutex_init(&drvdata->mutex); | |
265 | INIT_WORK(&drvdata->work, wm831x_status_work); | |
266 | spin_lock_init(&drvdata->value_lock); | |
267 | ||
268 | /* We cache the configuration register and read startup values | |
269 | * from it. */ | |
270 | drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg); | |
271 | ||
272 | if (drvdata->reg_val & WM831X_LED_MODE_MASK) | |
273 | drvdata->brightness = LED_FULL; | |
274 | else | |
275 | drvdata->brightness = LED_OFF; | |
276 | ||
277 | /* Set a default source if configured, otherwise leave the | |
278 | * current hardware setting. | |
279 | */ | |
280 | if (pdata.default_src == WM831X_STATUS_PRESERVE) { | |
281 | drvdata->src = drvdata->reg_val; | |
282 | drvdata->src &= WM831X_LED_SRC_MASK; | |
283 | drvdata->src >>= WM831X_LED_SRC_SHIFT; | |
284 | } else { | |
285 | drvdata->src = pdata.default_src - 1; | |
286 | } | |
287 | ||
288 | drvdata->cdev.name = pdata.name; | |
289 | drvdata->cdev.default_trigger = pdata.default_trigger; | |
290 | drvdata->cdev.brightness_set = wm831x_status_set; | |
291 | drvdata->cdev.blink_set = wm831x_status_blink_set; | |
b2015ed5 | 292 | drvdata->cdev.groups = wm831x_status_groups; |
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293 | |
294 | ret = led_classdev_register(wm831x->dev, &drvdata->cdev); | |
295 | if (ret < 0) { | |
296 | dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); | |
b2015ed5 | 297 | return ret; |
c746b551 MB |
298 | } |
299 | ||
c746b551 | 300 | return 0; |
c746b551 MB |
301 | } |
302 | ||
303 | static int wm831x_status_remove(struct platform_device *pdev) | |
304 | { | |
305 | struct wm831x_status *drvdata = platform_get_drvdata(pdev); | |
306 | ||
c746b551 | 307 | led_classdev_unregister(&drvdata->cdev); |
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308 | |
309 | return 0; | |
310 | } | |
311 | ||
312 | static struct platform_driver wm831x_status_driver = { | |
313 | .driver = { | |
314 | .name = "wm831x-status", | |
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315 | }, |
316 | .probe = wm831x_status_probe, | |
317 | .remove = wm831x_status_remove, | |
318 | }; | |
319 | ||
892a8843 | 320 | module_platform_driver(wm831x_status_driver); |
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321 | |
322 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
323 | MODULE_DESCRIPTION("WM831x status LED driver"); | |
324 | MODULE_LICENSE("GPL"); | |
325 | MODULE_ALIAS("platform:wm831x-status"); |