Commit | Line | Data |
---|---|---|
e081c49e BW |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (C) 2018 Spreadtrum Communications Inc. | |
3 | ||
4 | #include <linux/leds.h> | |
5 | #include <linux/module.h> | |
6 | #include <linux/of.h> | |
7 | #include <linux/platform_device.h> | |
8 | #include <linux/regmap.h> | |
e081c49e BW |
9 | |
10 | /* PMIC global control register definition */ | |
11 | #define SC27XX_MODULE_EN0 0xc08 | |
12 | #define SC27XX_CLK_EN0 0xc18 | |
13 | #define SC27XX_RGB_CTRL 0xebc | |
14 | ||
15 | #define SC27XX_BLTC_EN BIT(9) | |
16 | #define SC27XX_RTC_EN BIT(7) | |
17 | #define SC27XX_RGB_PD BIT(0) | |
18 | ||
19 | /* Breathing light controller register definition */ | |
20 | #define SC27XX_LEDS_CTRL 0x00 | |
21 | #define SC27XX_LEDS_PRESCALE 0x04 | |
22 | #define SC27XX_LEDS_DUTY 0x08 | |
23 | #define SC27XX_LEDS_CURVE0 0x0c | |
24 | #define SC27XX_LEDS_CURVE1 0x10 | |
25 | ||
26 | #define SC27XX_CTRL_SHIFT 4 | |
27 | #define SC27XX_LED_RUN BIT(0) | |
28 | #define SC27XX_LED_TYPE BIT(1) | |
29 | ||
30 | #define SC27XX_DUTY_SHIFT 8 | |
31 | #define SC27XX_DUTY_MASK GENMASK(15, 0) | |
32 | #define SC27XX_MOD_MASK GENMASK(7, 0) | |
33 | ||
8dbac65f BW |
34 | #define SC27XX_CURVE_SHIFT 8 |
35 | #define SC27XX_CURVE_L_MASK GENMASK(7, 0) | |
36 | #define SC27XX_CURVE_H_MASK GENMASK(15, 8) | |
37 | ||
e081c49e BW |
38 | #define SC27XX_LEDS_OFFSET 0x10 |
39 | #define SC27XX_LEDS_MAX 3 | |
8dbac65f BW |
40 | #define SC27XX_LEDS_PATTERN_CNT 4 |
41 | /* Stage duration step, in milliseconds */ | |
42 | #define SC27XX_LEDS_STEP 125 | |
43 | /* Minimum and maximum duration, in milliseconds */ | |
44 | #define SC27XX_DELTA_T_MIN SC27XX_LEDS_STEP | |
45 | #define SC27XX_DELTA_T_MAX (SC27XX_LEDS_STEP * 255) | |
e081c49e BW |
46 | |
47 | struct sc27xx_led { | |
5fdf85a0 | 48 | struct fwnode_handle *fwnode; |
e081c49e BW |
49 | struct led_classdev ldev; |
50 | struct sc27xx_led_priv *priv; | |
51 | u8 line; | |
52 | bool active; | |
53 | }; | |
54 | ||
55 | struct sc27xx_led_priv { | |
56 | struct sc27xx_led leds[SC27XX_LEDS_MAX]; | |
57 | struct regmap *regmap; | |
58 | struct mutex lock; | |
59 | u32 base; | |
60 | }; | |
61 | ||
62 | #define to_sc27xx_led(ldev) \ | |
63 | container_of(ldev, struct sc27xx_led, ldev) | |
64 | ||
65 | static int sc27xx_led_init(struct regmap *regmap) | |
66 | { | |
67 | int err; | |
68 | ||
69 | err = regmap_update_bits(regmap, SC27XX_MODULE_EN0, SC27XX_BLTC_EN, | |
70 | SC27XX_BLTC_EN); | |
71 | if (err) | |
72 | return err; | |
73 | ||
74 | err = regmap_update_bits(regmap, SC27XX_CLK_EN0, SC27XX_RTC_EN, | |
75 | SC27XX_RTC_EN); | |
76 | if (err) | |
77 | return err; | |
78 | ||
79 | return regmap_update_bits(regmap, SC27XX_RGB_CTRL, SC27XX_RGB_PD, 0); | |
80 | } | |
81 | ||
82 | static u32 sc27xx_led_get_offset(struct sc27xx_led *leds) | |
83 | { | |
84 | return leds->priv->base + SC27XX_LEDS_OFFSET * leds->line; | |
85 | } | |
86 | ||
87 | static int sc27xx_led_enable(struct sc27xx_led *leds, enum led_brightness value) | |
88 | { | |
89 | u32 base = sc27xx_led_get_offset(leds); | |
90 | u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL; | |
91 | u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line; | |
92 | struct regmap *regmap = leds->priv->regmap; | |
93 | int err; | |
94 | ||
95 | err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY, | |
96 | SC27XX_DUTY_MASK, | |
97 | (value << SC27XX_DUTY_SHIFT) | | |
98 | SC27XX_MOD_MASK); | |
99 | if (err) | |
100 | return err; | |
101 | ||
102 | return regmap_update_bits(regmap, ctrl_base, | |
103 | (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, | |
104 | (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift); | |
105 | } | |
106 | ||
107 | static int sc27xx_led_disable(struct sc27xx_led *leds) | |
108 | { | |
109 | struct regmap *regmap = leds->priv->regmap; | |
110 | u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL; | |
111 | u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line; | |
112 | ||
113 | return regmap_update_bits(regmap, ctrl_base, | |
114 | (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, 0); | |
115 | } | |
116 | ||
117 | static int sc27xx_led_set(struct led_classdev *ldev, enum led_brightness value) | |
118 | { | |
119 | struct sc27xx_led *leds = to_sc27xx_led(ldev); | |
120 | int err; | |
121 | ||
122 | mutex_lock(&leds->priv->lock); | |
123 | ||
124 | if (value == LED_OFF) | |
125 | err = sc27xx_led_disable(leds); | |
126 | else | |
127 | err = sc27xx_led_enable(leds, value); | |
128 | ||
129 | mutex_unlock(&leds->priv->lock); | |
130 | ||
131 | return err; | |
132 | } | |
133 | ||
8dbac65f BW |
134 | static void sc27xx_led_clamp_align_delta_t(u32 *delta_t) |
135 | { | |
136 | u32 v, offset, t = *delta_t; | |
137 | ||
138 | v = t + SC27XX_LEDS_STEP / 2; | |
139 | v = clamp_t(u32, v, SC27XX_DELTA_T_MIN, SC27XX_DELTA_T_MAX); | |
140 | offset = v - SC27XX_DELTA_T_MIN; | |
141 | offset = SC27XX_LEDS_STEP * (offset / SC27XX_LEDS_STEP); | |
142 | ||
143 | *delta_t = SC27XX_DELTA_T_MIN + offset; | |
144 | } | |
145 | ||
146 | static int sc27xx_led_pattern_clear(struct led_classdev *ldev) | |
147 | { | |
148 | struct sc27xx_led *leds = to_sc27xx_led(ldev); | |
149 | struct regmap *regmap = leds->priv->regmap; | |
150 | u32 base = sc27xx_led_get_offset(leds); | |
151 | u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL; | |
152 | u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line; | |
153 | int err; | |
154 | ||
155 | mutex_lock(&leds->priv->lock); | |
156 | ||
157 | /* Reset the rise, high, fall and low time to zero. */ | |
158 | regmap_write(regmap, base + SC27XX_LEDS_CURVE0, 0); | |
159 | regmap_write(regmap, base + SC27XX_LEDS_CURVE1, 0); | |
160 | ||
161 | err = regmap_update_bits(regmap, ctrl_base, | |
162 | (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, 0); | |
163 | ||
164 | ldev->brightness = LED_OFF; | |
165 | ||
166 | mutex_unlock(&leds->priv->lock); | |
167 | ||
168 | return err; | |
169 | } | |
170 | ||
171 | static int sc27xx_led_pattern_set(struct led_classdev *ldev, | |
172 | struct led_pattern *pattern, | |
173 | u32 len, int repeat) | |
174 | { | |
175 | struct sc27xx_led *leds = to_sc27xx_led(ldev); | |
176 | u32 base = sc27xx_led_get_offset(leds); | |
177 | u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL; | |
178 | u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line; | |
179 | struct regmap *regmap = leds->priv->regmap; | |
180 | int err; | |
181 | ||
182 | /* | |
183 | * Must contain 4 tuples to configure the rise time, high time, fall | |
184 | * time and low time to enable the breathing mode. | |
185 | */ | |
186 | if (len != SC27XX_LEDS_PATTERN_CNT) | |
187 | return -EINVAL; | |
188 | ||
189 | mutex_lock(&leds->priv->lock); | |
190 | ||
191 | sc27xx_led_clamp_align_delta_t(&pattern[0].delta_t); | |
192 | err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0, | |
193 | SC27XX_CURVE_L_MASK, | |
194 | pattern[0].delta_t / SC27XX_LEDS_STEP); | |
195 | if (err) | |
196 | goto out; | |
197 | ||
198 | sc27xx_led_clamp_align_delta_t(&pattern[1].delta_t); | |
199 | err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1, | |
200 | SC27XX_CURVE_L_MASK, | |
201 | pattern[1].delta_t / SC27XX_LEDS_STEP); | |
202 | if (err) | |
203 | goto out; | |
204 | ||
205 | sc27xx_led_clamp_align_delta_t(&pattern[2].delta_t); | |
206 | err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0, | |
207 | SC27XX_CURVE_H_MASK, | |
208 | (pattern[2].delta_t / SC27XX_LEDS_STEP) << | |
209 | SC27XX_CURVE_SHIFT); | |
210 | if (err) | |
211 | goto out; | |
212 | ||
213 | sc27xx_led_clamp_align_delta_t(&pattern[3].delta_t); | |
214 | err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1, | |
215 | SC27XX_CURVE_H_MASK, | |
216 | (pattern[3].delta_t / SC27XX_LEDS_STEP) << | |
217 | SC27XX_CURVE_SHIFT); | |
218 | if (err) | |
219 | goto out; | |
220 | ||
221 | err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY, | |
222 | SC27XX_DUTY_MASK, | |
223 | (pattern[1].brightness << SC27XX_DUTY_SHIFT) | | |
224 | SC27XX_MOD_MASK); | |
225 | if (err) | |
226 | goto out; | |
227 | ||
228 | /* Enable the LED breathing mode */ | |
229 | err = regmap_update_bits(regmap, ctrl_base, | |
230 | SC27XX_LED_RUN << ctrl_shift, | |
231 | SC27XX_LED_RUN << ctrl_shift); | |
232 | if (!err) | |
233 | ldev->brightness = pattern[1].brightness; | |
234 | ||
235 | out: | |
236 | mutex_unlock(&leds->priv->lock); | |
237 | ||
238 | return err; | |
239 | } | |
240 | ||
e081c49e BW |
241 | static int sc27xx_led_register(struct device *dev, struct sc27xx_led_priv *priv) |
242 | { | |
243 | int i, err; | |
244 | ||
245 | err = sc27xx_led_init(priv->regmap); | |
246 | if (err) | |
247 | return err; | |
248 | ||
249 | for (i = 0; i < SC27XX_LEDS_MAX; i++) { | |
250 | struct sc27xx_led *led = &priv->leds[i]; | |
5fdf85a0 | 251 | struct led_init_data init_data = {}; |
e081c49e BW |
252 | |
253 | if (!led->active) | |
254 | continue; | |
255 | ||
256 | led->line = i; | |
257 | led->priv = priv; | |
e081c49e | 258 | led->ldev.brightness_set_blocking = sc27xx_led_set; |
8dbac65f BW |
259 | led->ldev.pattern_set = sc27xx_led_pattern_set; |
260 | led->ldev.pattern_clear = sc27xx_led_pattern_clear; | |
261 | led->ldev.default_trigger = "pattern"; | |
e081c49e | 262 | |
5fdf85a0 JA |
263 | init_data.fwnode = led->fwnode; |
264 | init_data.devicename = "sc27xx"; | |
265 | init_data.default_label = ":"; | |
266 | ||
267 | err = devm_led_classdev_register_ext(dev, &led->ldev, | |
268 | &init_data); | |
e081c49e BW |
269 | if (err) |
270 | return err; | |
271 | } | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static int sc27xx_led_probe(struct platform_device *pdev) | |
277 | { | |
278 | struct device *dev = &pdev->dev; | |
8853c95e | 279 | struct device_node *np = dev_of_node(dev), *child; |
e081c49e | 280 | struct sc27xx_led_priv *priv; |
e081c49e BW |
281 | u32 base, count, reg; |
282 | int err; | |
283 | ||
99a013c8 | 284 | count = of_get_available_child_count(np); |
e081c49e BW |
285 | if (!count || count > SC27XX_LEDS_MAX) |
286 | return -EINVAL; | |
287 | ||
288 | err = of_property_read_u32(np, "reg", &base); | |
289 | if (err) { | |
290 | dev_err(dev, "fail to get reg of property\n"); | |
291 | return err; | |
292 | } | |
293 | ||
294 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
295 | if (!priv) | |
296 | return -ENOMEM; | |
297 | ||
298 | platform_set_drvdata(pdev, priv); | |
e081c49e BW |
299 | priv->base = base; |
300 | priv->regmap = dev_get_regmap(dev->parent, NULL); | |
43926c27 WY |
301 | if (!priv->regmap) { |
302 | err = -ENODEV; | |
e081c49e BW |
303 | dev_err(dev, "failed to get regmap: %d\n", err); |
304 | return err; | |
305 | } | |
306 | ||
99a013c8 | 307 | for_each_available_child_of_node(np, child) { |
e081c49e BW |
308 | err = of_property_read_u32(child, "reg", ®); |
309 | if (err) { | |
310 | of_node_put(child); | |
e081c49e BW |
311 | return err; |
312 | } | |
313 | ||
314 | if (reg >= SC27XX_LEDS_MAX || priv->leds[reg].active) { | |
315 | of_node_put(child); | |
e081c49e BW |
316 | return -EINVAL; |
317 | } | |
318 | ||
5fdf85a0 | 319 | priv->leds[reg].fwnode = of_fwnode_handle(child); |
e081c49e | 320 | priv->leds[reg].active = true; |
e081c49e BW |
321 | } |
322 | ||
50be9e02 CZ |
323 | mutex_init(&priv->lock); |
324 | ||
e081c49e BW |
325 | err = sc27xx_led_register(dev, priv); |
326 | if (err) | |
327 | mutex_destroy(&priv->lock); | |
328 | ||
329 | return err; | |
330 | } | |
331 | ||
60613020 | 332 | static void sc27xx_led_remove(struct platform_device *pdev) |
e081c49e BW |
333 | { |
334 | struct sc27xx_led_priv *priv = platform_get_drvdata(pdev); | |
335 | ||
336 | mutex_destroy(&priv->lock); | |
e081c49e BW |
337 | } |
338 | ||
339 | static const struct of_device_id sc27xx_led_of_match[] = { | |
340 | { .compatible = "sprd,sc2731-bltc", }, | |
341 | { } | |
342 | }; | |
343 | MODULE_DEVICE_TABLE(of, sc27xx_led_of_match); | |
344 | ||
345 | static struct platform_driver sc27xx_led_driver = { | |
346 | .driver = { | |
347 | .name = "sprd-bltc", | |
348 | .of_match_table = sc27xx_led_of_match, | |
349 | }, | |
350 | .probe = sc27xx_led_probe, | |
60613020 | 351 | .remove_new = sc27xx_led_remove, |
e081c49e BW |
352 | }; |
353 | ||
354 | module_platform_driver(sc27xx_led_driver); | |
355 | ||
356 | MODULE_DESCRIPTION("Spreadtrum SC27xx breathing light controller driver"); | |
357 | MODULE_AUTHOR("Xiaotong Lu <xiaotong.lu@spreadtrum.com>"); | |
8dbac65f | 358 | MODULE_AUTHOR("Baolin Wang <baolin.wang@linaro.org>"); |
e081c49e | 359 | MODULE_LICENSE("GPL v2"); |