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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c746b551 MB |
2 | /* |
3 | * LED driver for WM831x status LEDs | |
4 | * | |
5 | * Copyright(C) 2009 Wolfson Microelectronics PLC. | |
c746b551 MB |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
c746b551 | 9 | #include <linux/platform_device.h> |
5a0e3ad6 | 10 | #include <linux/slab.h> |
c746b551 MB |
11 | #include <linux/leds.h> |
12 | #include <linux/err.h> | |
13 | #include <linux/mfd/wm831x/core.h> | |
14 | #include <linux/mfd/wm831x/pdata.h> | |
15 | #include <linux/mfd/wm831x/status.h> | |
54f4dedb | 16 | #include <linux/module.h> |
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17 | |
18 | ||
19 | struct wm831x_status { | |
20 | struct led_classdev cdev; | |
21 | struct wm831x *wm831x; | |
c746b551 MB |
22 | struct mutex mutex; |
23 | ||
24 | spinlock_t value_lock; | |
25 | int reg; /* Control register */ | |
26 | int reg_val; /* Control register value */ | |
27 | ||
28 | int blink; | |
29 | int blink_time; | |
30 | int blink_cyc; | |
31 | int src; | |
32 | enum led_brightness brightness; | |
33 | }; | |
34 | ||
35 | #define to_wm831x_status(led_cdev) \ | |
36 | container_of(led_cdev, struct wm831x_status, cdev) | |
37 | ||
f633a512 | 38 | static void wm831x_status_set(struct wm831x_status *led) |
c746b551 | 39 | { |
c746b551 MB |
40 | unsigned long flags; |
41 | ||
42 | mutex_lock(&led->mutex); | |
43 | ||
44 | led->reg_val &= ~(WM831X_LED_SRC_MASK | WM831X_LED_MODE_MASK | | |
45 | WM831X_LED_DUTY_CYC_MASK | WM831X_LED_DUR_MASK); | |
46 | ||
47 | spin_lock_irqsave(&led->value_lock, flags); | |
48 | ||
49 | led->reg_val |= led->src << WM831X_LED_SRC_SHIFT; | |
50 | if (led->blink) { | |
51 | led->reg_val |= 2 << WM831X_LED_MODE_SHIFT; | |
52 | led->reg_val |= led->blink_time << WM831X_LED_DUR_SHIFT; | |
53 | led->reg_val |= led->blink_cyc; | |
54 | } else { | |
55 | if (led->brightness != LED_OFF) | |
56 | led->reg_val |= 1 << WM831X_LED_MODE_SHIFT; | |
57 | } | |
58 | ||
59 | spin_unlock_irqrestore(&led->value_lock, flags); | |
60 | ||
61 | wm831x_reg_write(led->wm831x, led->reg, led->reg_val); | |
62 | ||
63 | mutex_unlock(&led->mutex); | |
64 | } | |
65 | ||
f633a512 AL |
66 | static int wm831x_status_brightness_set(struct led_classdev *led_cdev, |
67 | enum led_brightness value) | |
c746b551 MB |
68 | { |
69 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
70 | unsigned long flags; | |
71 | ||
72 | spin_lock_irqsave(&led->value_lock, flags); | |
73 | led->brightness = value; | |
74 | if (value == LED_OFF) | |
75 | led->blink = 0; | |
c746b551 | 76 | spin_unlock_irqrestore(&led->value_lock, flags); |
f633a512 AL |
77 | wm831x_status_set(led); |
78 | ||
79 | return 0; | |
c746b551 MB |
80 | } |
81 | ||
82 | static int wm831x_status_blink_set(struct led_classdev *led_cdev, | |
83 | unsigned long *delay_on, | |
84 | unsigned long *delay_off) | |
85 | { | |
86 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
87 | unsigned long flags; | |
88 | int ret = 0; | |
89 | ||
90 | /* Pick some defaults if we've not been given times */ | |
91 | if (*delay_on == 0 && *delay_off == 0) { | |
92 | *delay_on = 250; | |
93 | *delay_off = 250; | |
94 | } | |
95 | ||
96 | spin_lock_irqsave(&led->value_lock, flags); | |
97 | ||
98 | /* We only have a limited selection of settings, see if we can | |
99 | * support the configuration we're being given */ | |
100 | switch (*delay_on) { | |
101 | case 1000: | |
102 | led->blink_time = 0; | |
103 | break; | |
104 | case 250: | |
105 | led->blink_time = 1; | |
106 | break; | |
107 | case 125: | |
108 | led->blink_time = 2; | |
109 | break; | |
110 | case 62: | |
111 | case 63: | |
112 | /* Actually 62.5ms */ | |
113 | led->blink_time = 3; | |
114 | break; | |
115 | default: | |
116 | ret = -EINVAL; | |
117 | break; | |
118 | } | |
119 | ||
120 | if (ret == 0) { | |
121 | switch (*delay_off / *delay_on) { | |
122 | case 1: | |
123 | led->blink_cyc = 0; | |
124 | break; | |
125 | case 3: | |
126 | led->blink_cyc = 1; | |
127 | break; | |
128 | case 4: | |
129 | led->blink_cyc = 2; | |
130 | break; | |
131 | case 8: | |
132 | led->blink_cyc = 3; | |
133 | break; | |
134 | default: | |
135 | ret = -EINVAL; | |
136 | break; | |
137 | } | |
138 | } | |
139 | ||
140 | if (ret == 0) | |
141 | led->blink = 1; | |
142 | else | |
143 | led->blink = 0; | |
144 | ||
c746b551 | 145 | spin_unlock_irqrestore(&led->value_lock, flags); |
f633a512 | 146 | wm831x_status_set(led); |
c746b551 MB |
147 | |
148 | return ret; | |
149 | } | |
150 | ||
8a4529a3 | 151 | static const char * const led_src_texts[] = { |
c746b551 MB |
152 | "otp", |
153 | "power", | |
154 | "charger", | |
155 | "soft", | |
156 | }; | |
157 | ||
5ccfa39d DR |
158 | static ssize_t src_show(struct device *dev, |
159 | struct device_attribute *attr, char *buf) | |
c746b551 MB |
160 | { |
161 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
162 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
163 | int i; | |
164 | ssize_t ret = 0; | |
165 | ||
166 | mutex_lock(&led->mutex); | |
167 | ||
168 | for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) | |
169 | if (i == led->src) | |
170 | ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]); | |
171 | else | |
172 | ret += sprintf(&buf[ret], "%s ", led_src_texts[i]); | |
173 | ||
174 | mutex_unlock(&led->mutex); | |
175 | ||
176 | ret += sprintf(&buf[ret], "\n"); | |
177 | ||
178 | return ret; | |
179 | } | |
180 | ||
5ccfa39d DR |
181 | static ssize_t src_store(struct device *dev, |
182 | struct device_attribute *attr, | |
183 | const char *buf, size_t size) | |
c746b551 MB |
184 | { |
185 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
186 | struct wm831x_status *led = to_wm831x_status(led_cdev); | |
c746b551 | 187 | int i; |
c746b551 | 188 | |
d54e5b52 AS |
189 | i = sysfs_match_string(led_src_texts, buf); |
190 | if (i >= 0) { | |
191 | mutex_lock(&led->mutex); | |
192 | led->src = i; | |
193 | mutex_unlock(&led->mutex); | |
194 | wm831x_status_set(led); | |
c746b551 MB |
195 | } |
196 | ||
197 | return size; | |
198 | } | |
199 | ||
5ccfa39d | 200 | static DEVICE_ATTR_RW(src); |
c746b551 | 201 | |
b2015ed5 JH |
202 | static struct attribute *wm831x_status_attrs[] = { |
203 | &dev_attr_src.attr, | |
204 | NULL | |
205 | }; | |
206 | ATTRIBUTE_GROUPS(wm831x_status); | |
207 | ||
c746b551 MB |
208 | static int wm831x_status_probe(struct platform_device *pdev) |
209 | { | |
210 | struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); | |
211 | struct wm831x_pdata *chip_pdata; | |
212 | struct wm831x_status_pdata pdata; | |
213 | struct wm831x_status *drvdata; | |
214 | struct resource *res; | |
215 | int id = pdev->id % ARRAY_SIZE(chip_pdata->status); | |
216 | int ret; | |
217 | ||
61abeba5 | 218 | res = platform_get_resource(pdev, IORESOURCE_REG, 0); |
c746b551 | 219 | if (res == NULL) { |
61abeba5 | 220 | dev_err(&pdev->dev, "No register resource\n"); |
b2015ed5 | 221 | return -EINVAL; |
c746b551 MB |
222 | } |
223 | ||
1713cb9d MB |
224 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_status), |
225 | GFP_KERNEL); | |
c746b551 MB |
226 | if (!drvdata) |
227 | return -ENOMEM; | |
c746b551 MB |
228 | |
229 | drvdata->wm831x = wm831x; | |
230 | drvdata->reg = res->start; | |
231 | ||
87aae1ea JH |
232 | if (dev_get_platdata(wm831x->dev)) |
233 | chip_pdata = dev_get_platdata(wm831x->dev); | |
c746b551 MB |
234 | else |
235 | chip_pdata = NULL; | |
236 | ||
237 | memset(&pdata, 0, sizeof(pdata)); | |
238 | if (chip_pdata && chip_pdata->status[id]) | |
239 | memcpy(&pdata, chip_pdata->status[id], sizeof(pdata)); | |
240 | else | |
241 | pdata.name = dev_name(&pdev->dev); | |
242 | ||
243 | mutex_init(&drvdata->mutex); | |
c746b551 MB |
244 | spin_lock_init(&drvdata->value_lock); |
245 | ||
246 | /* We cache the configuration register and read startup values | |
247 | * from it. */ | |
248 | drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg); | |
249 | ||
250 | if (drvdata->reg_val & WM831X_LED_MODE_MASK) | |
251 | drvdata->brightness = LED_FULL; | |
252 | else | |
253 | drvdata->brightness = LED_OFF; | |
254 | ||
255 | /* Set a default source if configured, otherwise leave the | |
256 | * current hardware setting. | |
257 | */ | |
258 | if (pdata.default_src == WM831X_STATUS_PRESERVE) { | |
259 | drvdata->src = drvdata->reg_val; | |
260 | drvdata->src &= WM831X_LED_SRC_MASK; | |
261 | drvdata->src >>= WM831X_LED_SRC_SHIFT; | |
262 | } else { | |
263 | drvdata->src = pdata.default_src - 1; | |
264 | } | |
265 | ||
266 | drvdata->cdev.name = pdata.name; | |
267 | drvdata->cdev.default_trigger = pdata.default_trigger; | |
f633a512 | 268 | drvdata->cdev.brightness_set_blocking = wm831x_status_brightness_set; |
c746b551 | 269 | drvdata->cdev.blink_set = wm831x_status_blink_set; |
b2015ed5 | 270 | drvdata->cdev.groups = wm831x_status_groups; |
c746b551 | 271 | |
47a459ec | 272 | ret = led_classdev_register(wm831x->dev, &drvdata->cdev); |
c746b551 MB |
273 | if (ret < 0) { |
274 | dev_err(&pdev->dev, "Failed to register LED: %d\n", ret); | |
b2015ed5 | 275 | return ret; |
c746b551 MB |
276 | } |
277 | ||
47a459ec JH |
278 | platform_set_drvdata(pdev, drvdata); |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
283 | static int wm831x_status_remove(struct platform_device *pdev) | |
284 | { | |
285 | struct wm831x_status *drvdata = platform_get_drvdata(pdev); | |
286 | ||
287 | led_classdev_unregister(&drvdata->cdev); | |
288 | ||
c746b551 | 289 | return 0; |
c746b551 MB |
290 | } |
291 | ||
c746b551 MB |
292 | static struct platform_driver wm831x_status_driver = { |
293 | .driver = { | |
294 | .name = "wm831x-status", | |
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295 | }, |
296 | .probe = wm831x_status_probe, | |
47a459ec | 297 | .remove = wm831x_status_remove, |
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298 | }; |
299 | ||
892a8843 | 300 | module_platform_driver(wm831x_status_driver); |
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301 | |
302 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
303 | MODULE_DESCRIPTION("WM831x status LED driver"); | |
304 | MODULE_LICENSE("GPL"); | |
305 | MODULE_ALIAS("platform:wm831x-status"); |