1
2
3#include <linux/bitops.h>
4#include <linux/i2c.h>
5#include <linux/kernel.h>
6#include <linux/led-class-flash.h>
7#include <linux/module.h>
8#include <linux/mutex.h>
9#include <linux/property.h>
10#include <linux/regmap.h>
11#include <media/v4l2-flash-led-class.h>
12
13#define RT4505_REG_RESET 0x0
14#define RT4505_REG_CONFIG 0x8
15#define RT4505_REG_ILED 0x9
16#define RT4505_REG_ENABLE 0xA
17#define RT4505_REG_FLAGS 0xB
18
19#define RT4505_RESET_MASK BIT(7)
20#define RT4505_FLASHTO_MASK GENMASK(2, 0)
21#define RT4505_ITORCH_MASK GENMASK(7, 5)
22#define RT4505_ITORCH_SHIFT 5
23#define RT4505_IFLASH_MASK GENMASK(4, 0)
24#define RT4505_ENABLE_MASK GENMASK(5, 0)
25#define RT4505_TORCH_SET (BIT(0) | BIT(4))
26#define RT4505_FLASH_SET (BIT(0) | BIT(1) | BIT(2) | BIT(4))
27#define RT4505_EXT_FLASH_SET (BIT(0) | BIT(1) | BIT(4) | BIT(5))
28#define RT4505_FLASH_GET (BIT(0) | BIT(1) | BIT(4))
29#define RT4505_OVP_MASK BIT(3)
30#define RT4505_SHORT_MASK BIT(2)
31#define RT4505_OTP_MASK BIT(1)
32#define RT4505_TIMEOUT_MASK BIT(0)
33
34#define RT4505_ITORCH_MINUA 46000
35#define RT4505_ITORCH_MAXUA 375000
36#define RT4505_ITORCH_STPUA 47000
37#define RT4505_IFLASH_MINUA 93750
38#define RT4505_IFLASH_MAXUA 1500000
39#define RT4505_IFLASH_STPUA 93750
40#define RT4505_FLASHTO_MINUS 100000
41#define RT4505_FLASHTO_MAXUS 800000
42#define RT4505_FLASHTO_STPUS 100000
43
44struct rt4505_priv {
45 struct device *dev;
46 struct regmap *regmap;
47 struct mutex lock;
48 struct led_classdev_flash flash;
49 struct v4l2_flash *v4l2_flash;
50};
51
52static int rt4505_torch_brightness_set(struct led_classdev *lcdev,
53 enum led_brightness level)
54{
55 struct rt4505_priv *priv =
56 container_of(lcdev, struct rt4505_priv, flash.led_cdev);
57 u32 val = 0;
58 int ret;
59
60 mutex_lock(&priv->lock);
61
62 if (level != LED_OFF) {
63 ret = regmap_update_bits(priv->regmap,
64 RT4505_REG_ILED, RT4505_ITORCH_MASK,
65 (level - 1) << RT4505_ITORCH_SHIFT);
66 if (ret)
67 goto unlock;
68
69 val = RT4505_TORCH_SET;
70 }
71
72 ret = regmap_update_bits(priv->regmap, RT4505_REG_ENABLE,
73 RT4505_ENABLE_MASK, val);
74
75unlock:
76 mutex_unlock(&priv->lock);
77 return ret;
78}
79
80static enum led_brightness rt4505_torch_brightness_get(
81 struct led_classdev *lcdev)
82{
83 struct rt4505_priv *priv =
84 container_of(lcdev, struct rt4505_priv, flash.led_cdev);
85 u32 val;
86 int ret;
87
88 mutex_lock(&priv->lock);
89
90 ret = regmap_read(priv->regmap, RT4505_REG_ENABLE, &val);
91 if (ret) {
92 dev_err(lcdev->dev, "Failed to get LED enable\n");
93 ret = LED_OFF;
94 goto unlock;
95 }
96
97 if ((val & RT4505_ENABLE_MASK) != RT4505_TORCH_SET) {
98 ret = LED_OFF;
99 goto unlock;
100 }
101
102 ret = regmap_read(priv->regmap, RT4505_REG_ILED, &val);
103 if (ret) {
104 dev_err(lcdev->dev, "Failed to get LED brightness\n");
105 ret = LED_OFF;
106 goto unlock;
107 }
108
109 ret = ((val & RT4505_ITORCH_MASK) >> RT4505_ITORCH_SHIFT) + 1;
110
111unlock:
112 mutex_unlock(&priv->lock);
113 return ret;
114}
115
116static int rt4505_flash_brightness_set(struct led_classdev_flash *fled_cdev,
117 u32 brightness)
118{
119 struct rt4505_priv *priv =
120 container_of(fled_cdev, struct rt4505_priv, flash);
121 struct led_flash_setting *s = &fled_cdev->brightness;
122 u32 val = (brightness - s->min) / s->step;
123 int ret;
124
125 mutex_lock(&priv->lock);
126 ret = regmap_update_bits(priv->regmap, RT4505_REG_ILED,
127 RT4505_IFLASH_MASK, val);
128 mutex_unlock(&priv->lock);
129
130 return ret;
131}
132
133static int rt4505_flash_strobe_set(struct led_classdev_flash *fled_cdev,
134 bool state)
135{
136 struct rt4505_priv *priv =
137 container_of(fled_cdev, struct rt4505_priv, flash);
138 u32 val = state ? RT4505_FLASH_SET : 0;
139 int ret;
140
141 mutex_lock(&priv->lock);
142 ret = regmap_update_bits(priv->regmap, RT4505_REG_ENABLE,
143 RT4505_ENABLE_MASK, val);
144 mutex_unlock(&priv->lock);
145
146 return ret;
147}
148
149static int rt4505_flash_strobe_get(struct led_classdev_flash *fled_cdev,
150 bool *state)
151{
152 struct rt4505_priv *priv =
153 container_of(fled_cdev, struct rt4505_priv, flash);
154 u32 val;
155 int ret;
156
157 mutex_lock(&priv->lock);
158
159 ret = regmap_read(priv->regmap, RT4505_REG_ENABLE, &val);
160 if (ret)
161 goto unlock;
162
163 *state = (val & RT4505_FLASH_GET) == RT4505_FLASH_GET;
164
165unlock:
166 mutex_unlock(&priv->lock);
167 return ret;
168}
169
170static int rt4505_flash_timeout_set(struct led_classdev_flash *fled_cdev,
171 u32 timeout)
172{
173 struct rt4505_priv *priv =
174 container_of(fled_cdev, struct rt4505_priv, flash);
175 struct led_flash_setting *s = &fled_cdev->timeout;
176 u32 val = (timeout - s->min) / s->step;
177 int ret;
178
179 mutex_lock(&priv->lock);
180 ret = regmap_update_bits(priv->regmap, RT4505_REG_CONFIG,
181 RT4505_FLASHTO_MASK, val);
182 mutex_unlock(&priv->lock);
183
184 return ret;
185}
186
187static int rt4505_fault_get(struct led_classdev_flash *fled_cdev, u32 *fault)
188{
189 struct rt4505_priv *priv =
190 container_of(fled_cdev, struct rt4505_priv, flash);
191 u32 val, led_faults = 0;
192 int ret;
193
194 ret = regmap_read(priv->regmap, RT4505_REG_FLAGS, &val);
195 if (ret)
196 return ret;
197
198 if (val & RT4505_OVP_MASK)
199 led_faults |= LED_FAULT_OVER_VOLTAGE;
200
201 if (val & RT4505_SHORT_MASK)
202 led_faults |= LED_FAULT_SHORT_CIRCUIT;
203
204 if (val & RT4505_OTP_MASK)
205 led_faults |= LED_FAULT_OVER_TEMPERATURE;
206
207 if (val & RT4505_TIMEOUT_MASK)
208 led_faults |= LED_FAULT_TIMEOUT;
209
210 *fault = led_faults;
211 return 0;
212}
213
214static const struct led_flash_ops rt4505_flash_ops = {
215 .flash_brightness_set = rt4505_flash_brightness_set,
216 .strobe_set = rt4505_flash_strobe_set,
217 .strobe_get = rt4505_flash_strobe_get,
218 .timeout_set = rt4505_flash_timeout_set,
219 .fault_get = rt4505_fault_get,
220};
221
222static bool rt4505_is_accessible_reg(struct device *dev, unsigned int reg)
223{
224 if (reg == RT4505_REG_RESET ||
225 (reg >= RT4505_REG_CONFIG && reg <= RT4505_REG_FLAGS))
226 return true;
227 return false;
228}
229
230static const struct regmap_config rt4505_regmap_config = {
231 .reg_bits = 8,
232 .val_bits = 8,
233 .max_register = RT4505_REG_FLAGS,
234
235 .readable_reg = rt4505_is_accessible_reg,
236 .writeable_reg = rt4505_is_accessible_reg,
237};
238
239#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
240static int rt4505_flash_external_strobe_set(struct v4l2_flash *v4l2_flash,
241 bool enable)
242{
243 struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
244 struct rt4505_priv *priv =
245 container_of(flash, struct rt4505_priv, flash);
246 u32 val = enable ? RT4505_EXT_FLASH_SET : 0;
247 int ret;
248
249 mutex_lock(&priv->lock);
250 ret = regmap_update_bits(priv->regmap, RT4505_REG_ENABLE,
251 RT4505_ENABLE_MASK, val);
252 mutex_unlock(&priv->lock);
253
254 return ret;
255}
256
257static const struct v4l2_flash_ops v4l2_flash_ops = {
258 .external_strobe_set = rt4505_flash_external_strobe_set,
259};
260
261static void rt4505_init_v4l2_config(struct rt4505_priv *priv,
262 struct v4l2_flash_config *config)
263{
264 struct led_classdev_flash *flash = &priv->flash;
265 struct led_classdev *lcdev = &flash->led_cdev;
266 struct led_flash_setting *s;
267
268 strscpy(config->dev_name, lcdev->dev->kobj.name,
269 sizeof(config->dev_name));
270
271 s = &config->intensity;
272 s->min = RT4505_ITORCH_MINUA;
273 s->step = RT4505_ITORCH_STPUA;
274 s->max = s->val = s->min + (lcdev->max_brightness - 1) * s->step;
275
276 config->flash_faults = LED_FAULT_OVER_VOLTAGE |
277 LED_FAULT_SHORT_CIRCUIT |
278 LED_FAULT_LED_OVER_TEMPERATURE |
279 LED_FAULT_TIMEOUT;
280 config->has_external_strobe = 1;
281}
282#else
283static const struct v4l2_flash_ops v4l2_flash_ops;
284static void rt4505_init_v4l2_config(struct rt4505_priv *priv,
285 struct v4l2_flash_config *config)
286{
287}
288#endif
289
290static void rt4505_init_flash_properties(struct rt4505_priv *priv,
291 struct fwnode_handle *child)
292{
293 struct led_classdev_flash *flash = &priv->flash;
294 struct led_classdev *lcdev = &flash->led_cdev;
295 struct led_flash_setting *s;
296 u32 val;
297 int ret;
298
299 ret = fwnode_property_read_u32(child, "led-max-microamp", &val);
300 if (ret) {
301 dev_warn(priv->dev, "led-max-microamp DT property missing\n");
302 val = RT4505_ITORCH_MINUA;
303 } else
304 val = clamp_val(val, RT4505_ITORCH_MINUA, RT4505_ITORCH_MAXUA);
305
306 lcdev->max_brightness =
307 (val - RT4505_ITORCH_MINUA) / RT4505_ITORCH_STPUA + 1;
308 lcdev->brightness_set_blocking = rt4505_torch_brightness_set;
309 lcdev->brightness_get = rt4505_torch_brightness_get;
310 lcdev->flags |= LED_DEV_CAP_FLASH;
311
312 ret = fwnode_property_read_u32(child, "flash-max-microamp", &val);
313 if (ret) {
314 dev_warn(priv->dev, "flash-max-microamp DT property missing\n");
315 val = RT4505_IFLASH_MINUA;
316 } else
317 val = clamp_val(val, RT4505_IFLASH_MINUA, RT4505_IFLASH_MAXUA);
318
319 s = &flash->brightness;
320 s->min = RT4505_IFLASH_MINUA;
321 s->step = RT4505_IFLASH_STPUA;
322 s->max = s->val = val;
323
324 ret = fwnode_property_read_u32(child, "flash-max-timeout-us", &val);
325 if (ret) {
326 dev_warn(priv->dev,
327 "flash-max-timeout-us DT property missing\n");
328 val = RT4505_FLASHTO_MINUS;
329 } else
330 val = clamp_val(val, RT4505_FLASHTO_MINUS,
331 RT4505_FLASHTO_MAXUS);
332
333 s = &flash->timeout;
334 s->min = RT4505_FLASHTO_MINUS;
335 s->step = RT4505_FLASHTO_STPUS;
336 s->max = s->val = val;
337
338 flash->ops = &rt4505_flash_ops;
339}
340
341static int rt4505_probe(struct i2c_client *client)
342{
343 struct rt4505_priv *priv;
344 struct fwnode_handle *child;
345 struct led_init_data init_data = {};
346 struct v4l2_flash_config v4l2_config = {};
347 int ret;
348
349 priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
350 if (!priv)
351 return -ENOMEM;
352
353 priv->dev = &client->dev;
354 mutex_init(&priv->lock);
355
356 priv->regmap = devm_regmap_init_i2c(client, &rt4505_regmap_config);
357 if (IS_ERR(priv->regmap)) {
358 dev_err(priv->dev, "Failed to allocate register map\n");
359 return PTR_ERR(priv->regmap);
360 }
361
362 ret = regmap_write(priv->regmap, RT4505_REG_RESET, RT4505_RESET_MASK);
363 if (ret) {
364 dev_err(priv->dev, "Failed to reset registers\n");
365 return ret;
366 }
367
368 child = fwnode_get_next_available_child_node(client->dev.fwnode, NULL);
369 if (!child) {
370 dev_err(priv->dev, "Failed to get child node\n");
371 return -EINVAL;
372 }
373 init_data.fwnode = child;
374
375 rt4505_init_flash_properties(priv, child);
376 ret = devm_led_classdev_flash_register_ext(priv->dev, &priv->flash,
377 &init_data);
378 if (ret) {
379 dev_err(priv->dev, "Failed to register flash\n");
380 return ret;
381 }
382
383 rt4505_init_v4l2_config(priv, &v4l2_config);
384 priv->v4l2_flash = v4l2_flash_init(priv->dev, init_data.fwnode,
385 &priv->flash, &v4l2_flash_ops,
386 &v4l2_config);
387 if (IS_ERR(priv->v4l2_flash)) {
388 dev_err(priv->dev, "Failed to register v4l2 flash\n");
389 return PTR_ERR(priv->v4l2_flash);
390 }
391
392 i2c_set_clientdata(client, priv);
393 return 0;
394}
395
396static int rt4505_remove(struct i2c_client *client)
397{
398 struct rt4505_priv *priv = i2c_get_clientdata(client);
399
400 v4l2_flash_release(priv->v4l2_flash);
401 return 0;
402}
403
404static void rt4505_shutdown(struct i2c_client *client)
405{
406 struct rt4505_priv *priv = i2c_get_clientdata(client);
407
408
409 regmap_write(priv->regmap, RT4505_REG_RESET, RT4505_RESET_MASK);
410}
411
412static const struct of_device_id __maybe_unused rt4505_leds_match[] = {
413 { .compatible = "richtek,rt4505", },
414 {}
415};
416MODULE_DEVICE_TABLE(of, rt4505_leds_match);
417
418static struct i2c_driver rt4505_driver = {
419 .driver = {
420 .name = "rt4505",
421 .of_match_table = of_match_ptr(rt4505_leds_match),
422 },
423 .probe_new = rt4505_probe,
424 .remove = rt4505_remove,
425 .shutdown = rt4505_shutdown,
426};
427module_i2c_driver(rt4505_driver);
428
429MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
430MODULE_LICENSE("GPL v2");
431
