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1 | /* Copyright (c) 2015, Sony Mobile Communications, AB. |
2 | * | |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License version 2 and | |
5 | * only version 2 as published by the Free Software Foundation. | |
6 | * | |
7 | * This program is distributed in the hope that it will be useful, | |
8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10 | * GNU General Public License for more details. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/leds.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/of.h> | |
17 | #include <linux/of_device.h> | |
18 | #include <linux/regmap.h> | |
19 | ||
20 | #define PM8941_WLED_REG_VAL_BASE 0x40 | |
21 | #define PM8941_WLED_REG_VAL_MAX 0xFFF | |
22 | ||
23 | #define PM8941_WLED_REG_MOD_EN 0x46 | |
24 | #define PM8941_WLED_REG_MOD_EN_BIT BIT(7) | |
25 | #define PM8941_WLED_REG_MOD_EN_MASK BIT(7) | |
26 | ||
27 | #define PM8941_WLED_REG_SYNC 0x47 | |
28 | #define PM8941_WLED_REG_SYNC_MASK 0x07 | |
29 | #define PM8941_WLED_REG_SYNC_LED1 BIT(0) | |
30 | #define PM8941_WLED_REG_SYNC_LED2 BIT(1) | |
31 | #define PM8941_WLED_REG_SYNC_LED3 BIT(2) | |
32 | #define PM8941_WLED_REG_SYNC_ALL 0x07 | |
33 | #define PM8941_WLED_REG_SYNC_CLEAR 0x00 | |
34 | ||
35 | #define PM8941_WLED_REG_FREQ 0x4c | |
36 | #define PM8941_WLED_REG_FREQ_MASK 0x0f | |
37 | ||
38 | #define PM8941_WLED_REG_OVP 0x4d | |
39 | #define PM8941_WLED_REG_OVP_MASK 0x03 | |
40 | ||
41 | #define PM8941_WLED_REG_BOOST 0x4e | |
42 | #define PM8941_WLED_REG_BOOST_MASK 0x07 | |
43 | ||
44 | #define PM8941_WLED_REG_SINK 0x4f | |
45 | #define PM8941_WLED_REG_SINK_MASK 0xe0 | |
46 | #define PM8941_WLED_REG_SINK_SHFT 0x05 | |
47 | ||
48 | /* Per-'string' registers below */ | |
49 | #define PM8941_WLED_REG_STR_OFFSET 0x10 | |
50 | ||
51 | #define PM8941_WLED_REG_STR_MOD_EN_BASE 0x60 | |
52 | #define PM8941_WLED_REG_STR_MOD_MASK BIT(7) | |
53 | #define PM8941_WLED_REG_STR_MOD_EN BIT(7) | |
54 | ||
55 | #define PM8941_WLED_REG_STR_SCALE_BASE 0x62 | |
56 | #define PM8941_WLED_REG_STR_SCALE_MASK 0x1f | |
57 | ||
58 | #define PM8941_WLED_REG_STR_MOD_SRC_BASE 0x63 | |
59 | #define PM8941_WLED_REG_STR_MOD_SRC_MASK 0x01 | |
60 | #define PM8941_WLED_REG_STR_MOD_SRC_INT 0x00 | |
61 | #define PM8941_WLED_REG_STR_MOD_SRC_EXT 0x01 | |
62 | ||
63 | #define PM8941_WLED_REG_STR_CABC_BASE 0x66 | |
64 | #define PM8941_WLED_REG_STR_CABC_MASK BIT(7) | |
65 | #define PM8941_WLED_REG_STR_CABC_EN BIT(7) | |
66 | ||
67 | struct pm8941_wled_config { | |
68 | u32 i_boost_limit; | |
69 | u32 ovp; | |
70 | u32 switch_freq; | |
71 | u32 num_strings; | |
72 | u32 i_limit; | |
73 | bool cs_out_en; | |
74 | bool ext_gen; | |
75 | bool cabc_en; | |
76 | }; | |
77 | ||
78 | struct pm8941_wled { | |
79 | struct regmap *regmap; | |
80 | u16 addr; | |
81 | ||
82 | struct led_classdev cdev; | |
83 | ||
84 | struct pm8941_wled_config cfg; | |
85 | }; | |
86 | ||
87 | static int pm8941_wled_set(struct led_classdev *cdev, | |
88 | enum led_brightness value) | |
89 | { | |
90 | struct pm8941_wled *wled; | |
91 | u8 ctrl = 0; | |
92 | u16 val; | |
93 | int rc; | |
94 | int i; | |
95 | ||
96 | wled = container_of(cdev, struct pm8941_wled, cdev); | |
97 | ||
98 | if (value != 0) | |
99 | ctrl = PM8941_WLED_REG_MOD_EN_BIT; | |
100 | ||
101 | val = value * PM8941_WLED_REG_VAL_MAX / LED_FULL; | |
102 | ||
103 | rc = regmap_update_bits(wled->regmap, | |
104 | wled->addr + PM8941_WLED_REG_MOD_EN, | |
105 | PM8941_WLED_REG_MOD_EN_MASK, ctrl); | |
106 | if (rc) | |
107 | return rc; | |
108 | ||
109 | for (i = 0; i < wled->cfg.num_strings; ++i) { | |
110 | u8 v[2] = { val & 0xff, (val >> 8) & 0xf }; | |
111 | ||
112 | rc = regmap_bulk_write(wled->regmap, | |
113 | wled->addr + PM8941_WLED_REG_VAL_BASE + 2 * i, | |
114 | v, 2); | |
115 | if (rc) | |
116 | return rc; | |
117 | } | |
118 | ||
119 | rc = regmap_update_bits(wled->regmap, | |
120 | wled->addr + PM8941_WLED_REG_SYNC, | |
121 | PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_ALL); | |
122 | if (rc) | |
123 | return rc; | |
124 | ||
125 | rc = regmap_update_bits(wled->regmap, | |
126 | wled->addr + PM8941_WLED_REG_SYNC, | |
127 | PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_CLEAR); | |
128 | return rc; | |
129 | } | |
130 | ||
131 | static void pm8941_wled_set_brightness(struct led_classdev *cdev, | |
132 | enum led_brightness value) | |
133 | { | |
134 | if (pm8941_wled_set(cdev, value)) { | |
135 | dev_err(cdev->dev, "Unable to set brightness\n"); | |
136 | return; | |
137 | } | |
138 | cdev->brightness = value; | |
139 | } | |
140 | ||
141 | static int pm8941_wled_setup(struct pm8941_wled *wled) | |
142 | { | |
143 | int rc; | |
144 | int i; | |
145 | ||
146 | rc = regmap_update_bits(wled->regmap, | |
147 | wled->addr + PM8941_WLED_REG_OVP, | |
148 | PM8941_WLED_REG_OVP_MASK, wled->cfg.ovp); | |
149 | if (rc) | |
150 | return rc; | |
151 | ||
152 | rc = regmap_update_bits(wled->regmap, | |
153 | wled->addr + PM8941_WLED_REG_BOOST, | |
154 | PM8941_WLED_REG_BOOST_MASK, wled->cfg.i_boost_limit); | |
155 | if (rc) | |
156 | return rc; | |
157 | ||
158 | rc = regmap_update_bits(wled->regmap, | |
159 | wled->addr + PM8941_WLED_REG_FREQ, | |
160 | PM8941_WLED_REG_FREQ_MASK, wled->cfg.switch_freq); | |
161 | if (rc) | |
162 | return rc; | |
163 | ||
164 | if (wled->cfg.cs_out_en) { | |
165 | u8 all = (BIT(wled->cfg.num_strings) - 1) | |
166 | << PM8941_WLED_REG_SINK_SHFT; | |
167 | ||
168 | rc = regmap_update_bits(wled->regmap, | |
169 | wled->addr + PM8941_WLED_REG_SINK, | |
170 | PM8941_WLED_REG_SINK_MASK, all); | |
171 | if (rc) | |
172 | return rc; | |
173 | } | |
174 | ||
175 | for (i = 0; i < wled->cfg.num_strings; ++i) { | |
176 | u16 addr = wled->addr + PM8941_WLED_REG_STR_OFFSET * i; | |
177 | ||
178 | rc = regmap_update_bits(wled->regmap, | |
179 | addr + PM8941_WLED_REG_STR_MOD_EN_BASE, | |
180 | PM8941_WLED_REG_STR_MOD_MASK, | |
181 | PM8941_WLED_REG_STR_MOD_EN); | |
182 | if (rc) | |
183 | return rc; | |
184 | ||
185 | if (wled->cfg.ext_gen) { | |
186 | rc = regmap_update_bits(wled->regmap, | |
187 | addr + PM8941_WLED_REG_STR_MOD_SRC_BASE, | |
188 | PM8941_WLED_REG_STR_MOD_SRC_MASK, | |
189 | PM8941_WLED_REG_STR_MOD_SRC_EXT); | |
190 | if (rc) | |
191 | return rc; | |
192 | } | |
193 | ||
194 | rc = regmap_update_bits(wled->regmap, | |
195 | addr + PM8941_WLED_REG_STR_SCALE_BASE, | |
196 | PM8941_WLED_REG_STR_SCALE_MASK, | |
197 | wled->cfg.i_limit); | |
198 | if (rc) | |
199 | return rc; | |
200 | ||
201 | rc = regmap_update_bits(wled->regmap, | |
202 | addr + PM8941_WLED_REG_STR_CABC_BASE, | |
203 | PM8941_WLED_REG_STR_CABC_MASK, | |
204 | wled->cfg.cabc_en ? | |
205 | PM8941_WLED_REG_STR_CABC_EN : 0); | |
206 | if (rc) | |
207 | return rc; | |
208 | } | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | static const struct pm8941_wled_config pm8941_wled_config_defaults = { | |
214 | .i_boost_limit = 3, | |
215 | .i_limit = 20, | |
216 | .ovp = 2, | |
217 | .switch_freq = 5, | |
218 | .num_strings = 0, | |
219 | .cs_out_en = false, | |
220 | .ext_gen = false, | |
221 | .cabc_en = false, | |
222 | }; | |
223 | ||
224 | struct pm8941_wled_var_cfg { | |
225 | const u32 *values; | |
226 | u32 (*fn)(u32); | |
227 | int size; | |
228 | }; | |
229 | ||
230 | static const u32 pm8941_wled_i_boost_limit_values[] = { | |
231 | 105, 385, 525, 805, 980, 1260, 1400, 1680, | |
232 | }; | |
233 | ||
234 | static const struct pm8941_wled_var_cfg pm8941_wled_i_boost_limit_cfg = { | |
235 | .values = pm8941_wled_i_boost_limit_values, | |
236 | .size = ARRAY_SIZE(pm8941_wled_i_boost_limit_values), | |
237 | }; | |
238 | ||
239 | static const u32 pm8941_wled_ovp_values[] = { | |
240 | 35, 32, 29, 27, | |
241 | }; | |
242 | ||
243 | static const struct pm8941_wled_var_cfg pm8941_wled_ovp_cfg = { | |
244 | .values = pm8941_wled_ovp_values, | |
245 | .size = ARRAY_SIZE(pm8941_wled_ovp_values), | |
246 | }; | |
247 | ||
248 | static u32 pm8941_wled_num_strings_values_fn(u32 idx) | |
249 | { | |
250 | return idx + 1; | |
251 | } | |
252 | ||
253 | static const struct pm8941_wled_var_cfg pm8941_wled_num_strings_cfg = { | |
254 | .fn = pm8941_wled_num_strings_values_fn, | |
255 | .size = 3, | |
256 | }; | |
257 | ||
258 | static u32 pm8941_wled_switch_freq_values_fn(u32 idx) | |
259 | { | |
260 | return 19200 / (2 * (1 + idx)); | |
261 | } | |
262 | ||
263 | static const struct pm8941_wled_var_cfg pm8941_wled_switch_freq_cfg = { | |
264 | .fn = pm8941_wled_switch_freq_values_fn, | |
265 | .size = 16, | |
266 | }; | |
267 | ||
268 | static const struct pm8941_wled_var_cfg pm8941_wled_i_limit_cfg = { | |
269 | .size = 26, | |
270 | }; | |
271 | ||
272 | static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx) | |
273 | { | |
274 | if (idx >= cfg->size) | |
275 | return UINT_MAX; | |
276 | if (cfg->fn) | |
277 | return cfg->fn(idx); | |
278 | if (cfg->values) | |
279 | return cfg->values[idx]; | |
280 | return idx; | |
281 | } | |
282 | ||
283 | static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev) | |
284 | { | |
285 | struct pm8941_wled_config *cfg = &wled->cfg; | |
286 | u32 val; | |
287 | int rc; | |
288 | u32 c; | |
289 | int i; | |
290 | int j; | |
291 | ||
292 | const struct { | |
293 | const char *name; | |
294 | u32 *val_ptr; | |
295 | const struct pm8941_wled_var_cfg *cfg; | |
296 | } u32_opts[] = { | |
297 | { | |
298 | "qcom,current-boost-limit", | |
299 | &cfg->i_boost_limit, | |
300 | .cfg = &pm8941_wled_i_boost_limit_cfg, | |
301 | }, | |
302 | { | |
303 | "qcom,current-limit", | |
304 | &cfg->i_limit, | |
305 | .cfg = &pm8941_wled_i_limit_cfg, | |
306 | }, | |
307 | { | |
308 | "qcom,ovp", | |
309 | &cfg->ovp, | |
310 | .cfg = &pm8941_wled_ovp_cfg, | |
311 | }, | |
312 | { | |
313 | "qcom,switching-freq", | |
314 | &cfg->switch_freq, | |
315 | .cfg = &pm8941_wled_switch_freq_cfg, | |
316 | }, | |
317 | { | |
318 | "qcom,num-strings", | |
319 | &cfg->num_strings, | |
320 | .cfg = &pm8941_wled_num_strings_cfg, | |
321 | }, | |
322 | }; | |
323 | const struct { | |
324 | const char *name; | |
325 | bool *val_ptr; | |
326 | } bool_opts[] = { | |
327 | { "qcom,cs-out", &cfg->cs_out_en, }, | |
328 | { "qcom,ext-gen", &cfg->ext_gen, }, | |
329 | { "qcom,cabc", &cfg->cabc_en, }, | |
330 | }; | |
331 | ||
332 | rc = of_property_read_u32(dev->of_node, "reg", &val); | |
333 | if (rc || val > 0xffff) { | |
334 | dev_err(dev, "invalid IO resources\n"); | |
335 | return rc ? rc : -EINVAL; | |
336 | } | |
337 | wled->addr = val; | |
338 | ||
339 | rc = of_property_read_string(dev->of_node, "label", &wled->cdev.name); | |
340 | if (rc) | |
341 | wled->cdev.name = dev->of_node->name; | |
342 | ||
343 | wled->cdev.default_trigger = of_get_property(dev->of_node, | |
344 | "linux,default-trigger", NULL); | |
345 | ||
346 | *cfg = pm8941_wled_config_defaults; | |
347 | for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) { | |
348 | rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val); | |
349 | if (rc == -EINVAL) { | |
350 | continue; | |
351 | } else if (rc) { | |
352 | dev_err(dev, "error reading '%s'\n", u32_opts[i].name); | |
353 | return rc; | |
354 | } | |
355 | ||
356 | c = UINT_MAX; | |
357 | for (j = 0; c != val; j++) { | |
358 | c = pm8941_wled_values(u32_opts[i].cfg, j); | |
359 | if (c == UINT_MAX) { | |
360 | dev_err(dev, "invalid value for '%s'\n", | |
361 | u32_opts[i].name); | |
362 | return -EINVAL; | |
363 | } | |
364 | } | |
365 | ||
366 | dev_dbg(dev, "'%s' = %u\n", u32_opts[i].name, c); | |
367 | *u32_opts[i].val_ptr = j; | |
368 | } | |
369 | ||
370 | for (i = 0; i < ARRAY_SIZE(bool_opts); ++i) { | |
371 | if (of_property_read_bool(dev->of_node, bool_opts[i].name)) | |
372 | *bool_opts[i].val_ptr = true; | |
373 | } | |
374 | ||
375 | cfg->num_strings = cfg->num_strings + 1; | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | static int pm8941_wled_probe(struct platform_device *pdev) | |
381 | { | |
382 | struct pm8941_wled *wled; | |
383 | struct regmap *regmap; | |
384 | int rc; | |
385 | ||
386 | regmap = dev_get_regmap(pdev->dev.parent, NULL); | |
387 | if (!regmap) { | |
388 | dev_err(&pdev->dev, "Unable to get regmap\n"); | |
389 | return -EINVAL; | |
390 | } | |
391 | ||
392 | wled = devm_kzalloc(&pdev->dev, sizeof(*wled), GFP_KERNEL); | |
393 | if (!wled) | |
394 | return -ENOMEM; | |
395 | ||
396 | wled->regmap = regmap; | |
397 | ||
398 | rc = pm8941_wled_configure(wled, &pdev->dev); | |
399 | if (rc) | |
400 | return rc; | |
401 | ||
402 | rc = pm8941_wled_setup(wled); | |
403 | if (rc) | |
404 | return rc; | |
405 | ||
406 | wled->cdev.brightness_set = pm8941_wled_set_brightness; | |
407 | ||
408 | rc = devm_led_classdev_register(&pdev->dev, &wled->cdev); | |
409 | if (rc) | |
410 | return rc; | |
411 | ||
412 | platform_set_drvdata(pdev, wled); | |
413 | ||
414 | return 0; | |
415 | }; | |
416 | ||
417 | static const struct of_device_id pm8941_wled_match_table[] = { | |
418 | { .compatible = "qcom,pm8941-wled" }, | |
419 | {} | |
420 | }; | |
421 | MODULE_DEVICE_TABLE(of, pm8941_wled_match_table); | |
422 | ||
423 | static struct platform_driver pm8941_wled_driver = { | |
424 | .probe = pm8941_wled_probe, | |
425 | .driver = { | |
426 | .name = "pm8941-wled", | |
427 | .of_match_table = pm8941_wled_match_table, | |
428 | }, | |
429 | }; | |
430 | ||
431 | module_platform_driver(pm8941_wled_driver); | |
432 | ||
433 | MODULE_DESCRIPTION("pm8941 wled driver"); | |
434 | MODULE_LICENSE("GPL v2"); | |
435 | MODULE_ALIAS("platform:pm8941-wled"); |