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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; | |
c746b551 MB |
26 | struct mutex mutex; |
27 | ||
28 | spinlock_t value_lock; | |
29 | int reg; /* Control register */ | |
30 | int reg_val; /* Control register value */ | |
31 | ||
32 | int blink; | |
33 | int blink_time; | |
34 | int blink_cyc; | |
35 | int src; | |
36 | enum led_brightness brightness; | |
37 | }; | |
38 | ||
39 | #define to_wm831x_status(led_cdev) \ | |
40 | container_of(led_cdev, struct wm831x_status, cdev) | |
41 | ||
f633a512 | 42 | static void wm831x_status_set(struct wm831x_status *led) |
c746b551 | 43 | { |
c746b551 MB |
44 | unsigned long flags; |
45 | ||
46 | mutex_lock(&led->mutex); | |
47 | ||
48 | led->reg_val &= ~(WM831X_LED_SRC_MASK | WM831X_LED_MODE_MASK | | |
49 | WM831X_LED_DUTY_CYC_MASK | WM831X_LED_DUR_MASK); | |
50 | ||
51 | spin_lock_irqsave(&led->value_lock, flags); | |
52 | ||
53 | led->reg_val |= led->src << WM831X_LED_SRC_SHIFT; | |
54 | if (led->blink) { | |
55 | led->reg_val |= 2 << WM831X_LED_MODE_SHIFT; | |
56 | led->reg_val |= led->blink_time << WM831X_LED_DUR_SHIFT; | |
57 | led->reg_val |= led->blink_cyc; | |
58 | } else { | |
59 | if (led->brightness != LED_OFF) | |
60 | led->reg_val |= 1 << WM831X_LED_MODE_SHIFT; | |
61 | } | |
62 | ||
63 | spin_unlock_irqrestore(&led->value_lock, flags); | |
64 | ||
65 | wm831x_reg_write(led->wm831x, led->reg, led->reg_val); | |
66 | ||
67 | mutex_unlock(&led->mutex); | |
68 | } | |
69 | ||
f633a512 AL |
70 | static int wm831x_status_brightness_set(struct led_classdev *led_cdev, |
71 | enum led_brightness value) | |
c746b551 MB |
72 | { |
73 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
74 | unsigned long flags; | |
75 | ||
76 | spin_lock_irqsave(&led->value_lock, flags); | |
77 | led->brightness = value; | |
78 | if (value == LED_OFF) | |
79 | led->blink = 0; | |
c746b551 | 80 | spin_unlock_irqrestore(&led->value_lock, flags); |
f633a512 AL |
81 | wm831x_status_set(led); |
82 | ||
83 | return 0; | |
c746b551 MB |
84 | } |
85 | ||
86 | static int wm831x_status_blink_set(struct led_classdev *led_cdev, | |
87 | unsigned long *delay_on, | |
88 | unsigned long *delay_off) | |
89 | { | |
90 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
91 | unsigned long flags; | |
92 | int ret = 0; | |
93 | ||
94 | /* Pick some defaults if we've not been given times */ | |
95 | if (*delay_on == 0 && *delay_off == 0) { | |
96 | *delay_on = 250; | |
97 | *delay_off = 250; | |
98 | } | |
99 | ||
100 | spin_lock_irqsave(&led->value_lock, flags); | |
101 | ||
102 | /* We only have a limited selection of settings, see if we can | |
103 | * support the configuration we're being given */ | |
104 | switch (*delay_on) { | |
105 | case 1000: | |
106 | led->blink_time = 0; | |
107 | break; | |
108 | case 250: | |
109 | led->blink_time = 1; | |
110 | break; | |
111 | case 125: | |
112 | led->blink_time = 2; | |
113 | break; | |
114 | case 62: | |
115 | case 63: | |
116 | /* Actually 62.5ms */ | |
117 | led->blink_time = 3; | |
118 | break; | |
119 | default: | |
120 | ret = -EINVAL; | |
121 | break; | |
122 | } | |
123 | ||
124 | if (ret == 0) { | |
125 | switch (*delay_off / *delay_on) { | |
126 | case 1: | |
127 | led->blink_cyc = 0; | |
128 | break; | |
129 | case 3: | |
130 | led->blink_cyc = 1; | |
131 | break; | |
132 | case 4: | |
133 | led->blink_cyc = 2; | |
134 | break; | |
135 | case 8: | |
136 | led->blink_cyc = 3; | |
137 | break; | |
138 | default: | |
139 | ret = -EINVAL; | |
140 | break; | |
141 | } | |
142 | } | |
143 | ||
144 | if (ret == 0) | |
145 | led->blink = 1; | |
146 | else | |
147 | led->blink = 0; | |
148 | ||
c746b551 | 149 | spin_unlock_irqrestore(&led->value_lock, flags); |
f633a512 | 150 | wm831x_status_set(led); |
c746b551 MB |
151 | |
152 | return ret; | |
153 | } | |
154 | ||
8a4529a3 | 155 | static const char * const led_src_texts[] = { |
c746b551 MB |
156 | "otp", |
157 | "power", | |
158 | "charger", | |
159 | "soft", | |
160 | }; | |
161 | ||
162 | static ssize_t wm831x_status_src_show(struct device *dev, | |
163 | struct device_attribute *attr, char *buf) | |
164 | { | |
165 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
166 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
167 | int i; | |
168 | ssize_t ret = 0; | |
169 | ||
170 | mutex_lock(&led->mutex); | |
171 | ||
172 | for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) | |
173 | if (i == led->src) | |
174 | ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]); | |
175 | else | |
176 | ret += sprintf(&buf[ret], "%s ", led_src_texts[i]); | |
177 | ||
178 | mutex_unlock(&led->mutex); | |
179 | ||
180 | ret += sprintf(&buf[ret], "\n"); | |
181 | ||
182 | return ret; | |
183 | } | |
184 | ||
185 | static ssize_t wm831x_status_src_store(struct device *dev, | |
186 | struct device_attribute *attr, | |
187 | const char *buf, size_t size) | |
188 | { | |
189 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
190 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
191 | char name[20]; | |
192 | int i; | |
193 | size_t len; | |
194 | ||
195 | name[sizeof(name) - 1] = '\0'; | |
196 | strncpy(name, buf, sizeof(name) - 1); | |
197 | len = strlen(name); | |
198 | ||
199 | if (len && name[len - 1] == '\n') | |
200 | name[len - 1] = '\0'; | |
201 | ||
202 | for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) { | |
203 | if (!strcmp(name, led_src_texts[i])) { | |
204 | mutex_lock(&led->mutex); | |
c746b551 | 205 | led->src = i; |
c746b551 | 206 | mutex_unlock(&led->mutex); |
f633a512 | 207 | wm831x_status_set(led); |
c746b551 MB |
208 | } |
209 | } | |
210 | ||
211 | return size; | |
212 | } | |
213 | ||
214 | static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store); | |
215 | ||
b2015ed5 JH |
216 | static struct attribute *wm831x_status_attrs[] = { |
217 | &dev_attr_src.attr, | |
218 | NULL | |
219 | }; | |
220 | ATTRIBUTE_GROUPS(wm831x_status); | |
221 | ||
c746b551 MB |
222 | static int wm831x_status_probe(struct platform_device *pdev) |
223 | { | |
224 | struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); | |
225 | struct wm831x_pdata *chip_pdata; | |
226 | struct wm831x_status_pdata pdata; | |
227 | struct wm831x_status *drvdata; | |
228 | struct resource *res; | |
229 | int id = pdev->id % ARRAY_SIZE(chip_pdata->status); | |
230 | int ret; | |
231 | ||
61abeba5 | 232 | res = platform_get_resource(pdev, IORESOURCE_REG, 0); |
c746b551 | 233 | if (res == NULL) { |
61abeba5 | 234 | dev_err(&pdev->dev, "No register resource\n"); |
b2015ed5 | 235 | return -EINVAL; |
c746b551 MB |
236 | } |
237 | ||
1713cb9d MB |
238 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_status), |
239 | GFP_KERNEL); | |
c746b551 MB |
240 | if (!drvdata) |
241 | return -ENOMEM; | |
c746b551 MB |
242 | |
243 | drvdata->wm831x = wm831x; | |
244 | drvdata->reg = res->start; | |
245 | ||
87aae1ea JH |
246 | if (dev_get_platdata(wm831x->dev)) |
247 | chip_pdata = dev_get_platdata(wm831x->dev); | |
c746b551 MB |
248 | else |
249 | chip_pdata = NULL; | |
250 | ||
251 | memset(&pdata, 0, sizeof(pdata)); | |
252 | if (chip_pdata && chip_pdata->status[id]) | |
253 | memcpy(&pdata, chip_pdata->status[id], sizeof(pdata)); | |
254 | else | |
255 | pdata.name = dev_name(&pdev->dev); | |
256 | ||
257 | mutex_init(&drvdata->mutex); | |
c746b551 MB |
258 | spin_lock_init(&drvdata->value_lock); |
259 | ||
260 | /* We cache the configuration register and read startup values | |
261 | * from it. */ | |
262 | drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg); | |
263 | ||
264 | if (drvdata->reg_val & WM831X_LED_MODE_MASK) | |
265 | drvdata->brightness = LED_FULL; | |
266 | else | |
267 | drvdata->brightness = LED_OFF; | |
268 | ||
269 | /* Set a default source if configured, otherwise leave the | |
270 | * current hardware setting. | |
271 | */ | |
272 | if (pdata.default_src == WM831X_STATUS_PRESERVE) { | |
273 | drvdata->src = drvdata->reg_val; | |
274 | drvdata->src &= WM831X_LED_SRC_MASK; | |
275 | drvdata->src >>= WM831X_LED_SRC_SHIFT; | |
276 | } else { | |
277 | drvdata->src = pdata.default_src - 1; | |
278 | } | |
279 | ||
280 | drvdata->cdev.name = pdata.name; | |
281 | drvdata->cdev.default_trigger = pdata.default_trigger; | |
f633a512 | 282 | drvdata->cdev.brightness_set_blocking = wm831x_status_brightness_set; |
c746b551 | 283 | drvdata->cdev.blink_set = wm831x_status_blink_set; |
b2015ed5 | 284 | drvdata->cdev.groups = wm831x_status_groups; |
c746b551 | 285 | |
8d3b6a40 | 286 | ret = devm_led_classdev_register(wm831x->dev, &drvdata->cdev); |
c746b551 MB |
287 | if (ret < 0) { |
288 | dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); | |
b2015ed5 | 289 | return ret; |
c746b551 MB |
290 | } |
291 | ||
c746b551 | 292 | return 0; |
c746b551 MB |
293 | } |
294 | ||
c746b551 MB |
295 | static struct platform_driver wm831x_status_driver = { |
296 | .driver = { | |
297 | .name = "wm831x-status", | |
c746b551 MB |
298 | }, |
299 | .probe = wm831x_status_probe, | |
c746b551 MB |
300 | }; |
301 | ||
892a8843 | 302 | module_platform_driver(wm831x_status_driver); |
c746b551 MB |
303 | |
304 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
305 | MODULE_DESCRIPTION("WM831x status LED driver"); | |
306 | MODULE_LICENSE("GPL"); | |
307 | MODULE_ALIAS("platform:wm831x-status"); |