1
2
3
4
5
6
7
8
9
10
11
12#include <linux/delay.h>
13#include <linux/i2c.h>
14#include <linux/module.h>
15#include <linux/slab.h>
16#include <linux/regmap.h>
17#include <linux/videodev2.h>
18#include <media/i2c/lm3646.h>
19#include <media/v4l2-ctrls.h>
20#include <media/v4l2-device.h>
21
22
23#define REG_ENABLE 0x01
24#define REG_TORCH_BR 0x05
25#define REG_FLASH_BR 0x05
26#define REG_FLASH_TOUT 0x04
27#define REG_FLAG 0x08
28#define REG_STROBE_SRC 0x06
29#define REG_LED1_FLASH_BR 0x06
30#define REG_LED1_TORCH_BR 0x07
31
32#define MASK_ENABLE 0x03
33#define MASK_TORCH_BR 0x70
34#define MASK_FLASH_BR 0x0F
35#define MASK_FLASH_TOUT 0x07
36#define MASK_FLAG 0xFF
37#define MASK_STROBE_SRC 0x80
38
39
40#define FAULT_TIMEOUT (1<<0)
41#define FAULT_SHORT_CIRCUIT (1<<1)
42#define FAULT_UVLO (1<<2)
43#define FAULT_IVFM (1<<3)
44#define FAULT_OCP (1<<4)
45#define FAULT_OVERTEMP (1<<5)
46#define FAULT_NTC_TRIP (1<<6)
47#define FAULT_OVP (1<<7)
48
49enum led_mode {
50 MODE_SHDN = 0x0,
51 MODE_TORCH = 0x2,
52 MODE_FLASH = 0x3,
53};
54
55
56
57
58
59
60
61
62
63
64
65
66struct lm3646_flash {
67 struct device *dev;
68 struct lm3646_platform_data *pdata;
69 struct regmap *regmap;
70
71 struct v4l2_ctrl_handler ctrls_led;
72 struct v4l2_subdev subdev_led;
73
74 u8 mode_reg;
75};
76
77#define to_lm3646_flash(_ctrl) \
78 container_of(_ctrl->handler, struct lm3646_flash, ctrls_led)
79
80
81static int lm3646_mode_ctrl(struct lm3646_flash *flash,
82 enum v4l2_flash_led_mode led_mode)
83{
84 switch (led_mode) {
85 case V4L2_FLASH_LED_MODE_NONE:
86 return regmap_write(flash->regmap,
87 REG_ENABLE, flash->mode_reg | MODE_SHDN);
88 case V4L2_FLASH_LED_MODE_TORCH:
89 return regmap_write(flash->regmap,
90 REG_ENABLE, flash->mode_reg | MODE_TORCH);
91 case V4L2_FLASH_LED_MODE_FLASH:
92 return regmap_write(flash->regmap,
93 REG_ENABLE, flash->mode_reg | MODE_FLASH);
94 }
95 return -EINVAL;
96}
97
98
99static int lm3646_get_ctrl(struct v4l2_ctrl *ctrl)
100{
101 struct lm3646_flash *flash = to_lm3646_flash(ctrl);
102 unsigned int reg_val;
103 int rval;
104
105 if (ctrl->id != V4L2_CID_FLASH_FAULT)
106 return -EINVAL;
107
108 rval = regmap_read(flash->regmap, REG_FLAG, ®_val);
109 if (rval < 0)
110 return rval;
111
112 ctrl->val = 0;
113 if (reg_val & FAULT_TIMEOUT)
114 ctrl->val |= V4L2_FLASH_FAULT_TIMEOUT;
115 if (reg_val & FAULT_SHORT_CIRCUIT)
116 ctrl->val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
117 if (reg_val & FAULT_UVLO)
118 ctrl->val |= V4L2_FLASH_FAULT_UNDER_VOLTAGE;
119 if (reg_val & FAULT_IVFM)
120 ctrl->val |= V4L2_FLASH_FAULT_INPUT_VOLTAGE;
121 if (reg_val & FAULT_OCP)
122 ctrl->val |= V4L2_FLASH_FAULT_OVER_CURRENT;
123 if (reg_val & FAULT_OVERTEMP)
124 ctrl->val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
125 if (reg_val & FAULT_NTC_TRIP)
126 ctrl->val |= V4L2_FLASH_FAULT_LED_OVER_TEMPERATURE;
127 if (reg_val & FAULT_OVP)
128 ctrl->val |= V4L2_FLASH_FAULT_OVER_VOLTAGE;
129
130 return 0;
131}
132
133static int lm3646_set_ctrl(struct v4l2_ctrl *ctrl)
134{
135 struct lm3646_flash *flash = to_lm3646_flash(ctrl);
136 unsigned int reg_val;
137 int rval = -EINVAL;
138
139 switch (ctrl->id) {
140 case V4L2_CID_FLASH_LED_MODE:
141
142 if (ctrl->val != V4L2_FLASH_LED_MODE_FLASH)
143 return lm3646_mode_ctrl(flash, ctrl->val);
144
145 return lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_NONE);
146
147 case V4L2_CID_FLASH_STROBE_SOURCE:
148 return regmap_update_bits(flash->regmap,
149 REG_STROBE_SRC, MASK_STROBE_SRC,
150 (ctrl->val) << 7);
151
152 case V4L2_CID_FLASH_STROBE:
153
154
155 rval = regmap_read(flash->regmap, REG_ENABLE, ®_val);
156 if (rval < 0 || ((reg_val & MASK_ENABLE) != MODE_SHDN))
157 return rval;
158
159 return lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_FLASH);
160
161 case V4L2_CID_FLASH_STROBE_STOP:
162
163
164
165
166
167
168 rval = regmap_read(flash->regmap, REG_ENABLE, ®_val);
169 if (rval < 0)
170 return rval;
171 if ((reg_val & MASK_ENABLE) == MODE_FLASH)
172 return lm3646_mode_ctrl(flash,
173 V4L2_FLASH_LED_MODE_NONE);
174 return rval;
175
176 case V4L2_CID_FLASH_TIMEOUT:
177 return regmap_update_bits(flash->regmap,
178 REG_FLASH_TOUT, MASK_FLASH_TOUT,
179 LM3646_FLASH_TOUT_ms_TO_REG
180 (ctrl->val));
181
182 case V4L2_CID_FLASH_INTENSITY:
183 return regmap_update_bits(flash->regmap,
184 REG_FLASH_BR, MASK_FLASH_BR,
185 LM3646_TOTAL_FLASH_BRT_uA_TO_REG
186 (ctrl->val));
187
188 case V4L2_CID_FLASH_TORCH_INTENSITY:
189 return regmap_update_bits(flash->regmap,
190 REG_TORCH_BR, MASK_TORCH_BR,
191 LM3646_TOTAL_TORCH_BRT_uA_TO_REG
192 (ctrl->val) << 4);
193 }
194
195 return -EINVAL;
196}
197
198static const struct v4l2_ctrl_ops lm3646_led_ctrl_ops = {
199 .g_volatile_ctrl = lm3646_get_ctrl,
200 .s_ctrl = lm3646_set_ctrl,
201};
202
203static int lm3646_init_controls(struct lm3646_flash *flash)
204{
205 struct v4l2_ctrl *fault;
206 struct v4l2_ctrl_handler *hdl = &flash->ctrls_led;
207 const struct v4l2_ctrl_ops *ops = &lm3646_led_ctrl_ops;
208
209 v4l2_ctrl_handler_init(hdl, 8);
210
211 v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_LED_MODE,
212 V4L2_FLASH_LED_MODE_TORCH, ~0x7,
213 V4L2_FLASH_LED_MODE_NONE);
214
215
216 v4l2_ctrl_new_std_menu(hdl, ops, V4L2_CID_FLASH_STROBE_SOURCE,
217 0x1, ~0x3, V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
218
219
220 v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
221
222 v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
223
224
225 v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TIMEOUT,
226 LM3646_FLASH_TOUT_MIN,
227 LM3646_FLASH_TOUT_MAX,
228 LM3646_FLASH_TOUT_STEP, flash->pdata->flash_timeout);
229
230
231 v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_INTENSITY,
232 LM3646_TOTAL_FLASH_BRT_MIN,
233 LM3646_TOTAL_FLASH_BRT_MAX,
234 LM3646_TOTAL_FLASH_BRT_STEP,
235 LM3646_TOTAL_FLASH_BRT_MAX);
236
237
238 v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_TORCH_INTENSITY,
239 LM3646_TOTAL_TORCH_BRT_MIN,
240 LM3646_TOTAL_TORCH_BRT_MAX,
241 LM3646_TOTAL_TORCH_BRT_STEP,
242 LM3646_TOTAL_TORCH_BRT_MAX);
243
244
245 fault = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FLASH_FAULT, 0,
246 V4L2_FLASH_FAULT_OVER_VOLTAGE
247 | V4L2_FLASH_FAULT_OVER_TEMPERATURE
248 | V4L2_FLASH_FAULT_SHORT_CIRCUIT
249 | V4L2_FLASH_FAULT_TIMEOUT, 0, 0);
250 if (fault != NULL)
251 fault->flags |= V4L2_CTRL_FLAG_VOLATILE;
252
253 if (hdl->error)
254 return hdl->error;
255
256 flash->subdev_led.ctrl_handler = hdl;
257 return 0;
258}
259
260
261static const struct v4l2_subdev_ops lm3646_ops = {
262 .core = NULL,
263};
264
265static const struct regmap_config lm3646_regmap = {
266 .reg_bits = 8,
267 .val_bits = 8,
268 .max_register = 0xFF,
269};
270
271static int lm3646_subdev_init(struct lm3646_flash *flash)
272{
273 struct i2c_client *client = to_i2c_client(flash->dev);
274 int rval;
275
276 v4l2_i2c_subdev_init(&flash->subdev_led, client, &lm3646_ops);
277 flash->subdev_led.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
278 strscpy(flash->subdev_led.name, LM3646_NAME,
279 sizeof(flash->subdev_led.name));
280 rval = lm3646_init_controls(flash);
281 if (rval)
282 goto err_out;
283 rval = media_entity_pads_init(&flash->subdev_led.entity, 0, NULL);
284 if (rval < 0)
285 goto err_out;
286 flash->subdev_led.entity.function = MEDIA_ENT_F_FLASH;
287 return rval;
288
289err_out:
290 v4l2_ctrl_handler_free(&flash->ctrls_led);
291 return rval;
292}
293
294static int lm3646_init_device(struct lm3646_flash *flash)
295{
296 unsigned int reg_val;
297 int rval;
298
299
300 rval = regmap_read(flash->regmap, REG_ENABLE, ®_val);
301 if (rval < 0)
302 return rval;
303 flash->mode_reg = reg_val & 0xfc;
304
305
306 rval = lm3646_mode_ctrl(flash, V4L2_FLASH_LED_MODE_NONE);
307 if (rval < 0)
308 return rval;
309
310
311
312
313
314 rval = regmap_update_bits(flash->regmap,
315 REG_LED1_FLASH_BR, 0x7F,
316 LM3646_LED1_FLASH_BRT_uA_TO_REG
317 (flash->pdata->led1_flash_brt));
318
319 if (rval < 0)
320 return rval;
321
322
323
324
325
326 rval = regmap_update_bits(flash->regmap,
327 REG_LED1_TORCH_BR, 0x7F,
328 LM3646_LED1_TORCH_BRT_uA_TO_REG
329 (flash->pdata->led1_torch_brt));
330 if (rval < 0)
331 return rval;
332
333
334 return regmap_read(flash->regmap, REG_FLAG, ®_val);
335}
336
337static int lm3646_probe(struct i2c_client *client,
338 const struct i2c_device_id *devid)
339{
340 struct lm3646_flash *flash;
341 struct lm3646_platform_data *pdata = dev_get_platdata(&client->dev);
342 int rval;
343
344 flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
345 if (flash == NULL)
346 return -ENOMEM;
347
348 flash->regmap = devm_regmap_init_i2c(client, &lm3646_regmap);
349 if (IS_ERR(flash->regmap))
350 return PTR_ERR(flash->regmap);
351
352
353 if (pdata == NULL) {
354 pdata = devm_kzalloc(&client->dev,
355 sizeof(struct lm3646_platform_data),
356 GFP_KERNEL);
357 if (pdata == NULL)
358 return -ENOMEM;
359
360 pdata->flash_timeout = LM3646_FLASH_TOUT_MAX;
361 pdata->led1_torch_brt = LM3646_LED1_TORCH_BRT_MAX;
362 pdata->led1_flash_brt = LM3646_LED1_FLASH_BRT_MAX;
363 }
364 flash->pdata = pdata;
365 flash->dev = &client->dev;
366
367 rval = lm3646_subdev_init(flash);
368 if (rval < 0)
369 return rval;
370
371 rval = lm3646_init_device(flash);
372 if (rval < 0)
373 return rval;
374
375 i2c_set_clientdata(client, flash);
376
377 return 0;
378}
379
380static int lm3646_remove(struct i2c_client *client)
381{
382 struct lm3646_flash *flash = i2c_get_clientdata(client);
383
384 v4l2_device_unregister_subdev(&flash->subdev_led);
385 v4l2_ctrl_handler_free(&flash->ctrls_led);
386 media_entity_cleanup(&flash->subdev_led.entity);
387
388 return 0;
389}
390
391static const struct i2c_device_id lm3646_id_table[] = {
392 {LM3646_NAME, 0},
393 {}
394};
395
396MODULE_DEVICE_TABLE(i2c, lm3646_id_table);
397
398static struct i2c_driver lm3646_i2c_driver = {
399 .driver = {
400 .name = LM3646_NAME,
401 },
402 .probe = lm3646_probe,
403 .remove = lm3646_remove,
404 .id_table = lm3646_id_table,
405};
406
407module_i2c_driver(lm3646_i2c_driver);
408
409MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
410MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
411MODULE_DESCRIPTION("Texas Instruments LM3646 Dual Flash LED driver");
412MODULE_LICENSE("GPL");
413
