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22db44cb | 1 | /* |
cb7a01ac | 2 | * drivers/media/i2c/as3645a.c - AS3645A and LM3555 flash controllers driver |
22db44cb LP |
3 | * |
4 | * Copyright (C) 2008-2011 Nokia Corporation | |
5 | * Copyright (c) 2011, Intel Corporation. | |
6 | * | |
7 | * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * version 2 as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
21 | * 02110-1301 USA | |
22 | * | |
23 | * TODO: | |
24 | * - Check hardware FSTROBE control when sensor driver add support for this | |
25 | * | |
26 | */ | |
27 | ||
28 | #include <linux/delay.h> | |
29 | #include <linux/i2c.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/mutex.h> | |
36be126c | 32 | #include <linux/slab.h> |
22db44cb LP |
33 | |
34 | #include <media/as3645a.h> | |
35 | #include <media/v4l2-ctrls.h> | |
36 | #include <media/v4l2-device.h> | |
37 | ||
38 | #define AS_TIMER_MS_TO_CODE(t) (((t) - 100) / 50) | |
39 | #define AS_TIMER_CODE_TO_MS(c) (50 * (c) + 100) | |
40 | ||
41 | /* Register definitions */ | |
42 | ||
43 | /* Read-only Design info register: Reset state: xxxx 0001 */ | |
44 | #define AS_DESIGN_INFO_REG 0x00 | |
45 | #define AS_DESIGN_INFO_FACTORY(x) (((x) >> 4)) | |
46 | #define AS_DESIGN_INFO_MODEL(x) ((x) & 0x0f) | |
47 | ||
48 | /* Read-only Version control register: Reset state: 0000 0000 | |
49 | * for first engineering samples | |
50 | */ | |
51 | #define AS_VERSION_CONTROL_REG 0x01 | |
52 | #define AS_VERSION_CONTROL_RFU(x) (((x) >> 4)) | |
53 | #define AS_VERSION_CONTROL_VERSION(x) ((x) & 0x0f) | |
54 | ||
55 | /* Read / Write (Indicator and timer register): Reset state: 0000 1111 */ | |
56 | #define AS_INDICATOR_AND_TIMER_REG 0x02 | |
57 | #define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT 0 | |
58 | #define AS_INDICATOR_AND_TIMER_VREF_SHIFT 4 | |
59 | #define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT 6 | |
60 | ||
61 | /* Read / Write (Current set register): Reset state: 0110 1001 */ | |
62 | #define AS_CURRENT_SET_REG 0x03 | |
63 | #define AS_CURRENT_ASSIST_LIGHT_SHIFT 0 | |
64 | #define AS_CURRENT_LED_DET_ON (1 << 3) | |
65 | #define AS_CURRENT_FLASH_CURRENT_SHIFT 4 | |
66 | ||
67 | /* Read / Write (Control register): Reset state: 1011 0100 */ | |
68 | #define AS_CONTROL_REG 0x04 | |
69 | #define AS_CONTROL_MODE_SETTING_SHIFT 0 | |
70 | #define AS_CONTROL_STROBE_ON (1 << 2) | |
71 | #define AS_CONTROL_OUT_ON (1 << 3) | |
72 | #define AS_CONTROL_EXT_TORCH_ON (1 << 4) | |
73 | #define AS_CONTROL_STROBE_TYPE_EDGE (0 << 5) | |
74 | #define AS_CONTROL_STROBE_TYPE_LEVEL (1 << 5) | |
75 | #define AS_CONTROL_COIL_PEAK_SHIFT 6 | |
76 | ||
77 | /* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */ | |
78 | #define AS_FAULT_INFO_REG 0x05 | |
79 | #define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT (1 << 1) | |
80 | #define AS_FAULT_INFO_INDICATOR_LED (1 << 2) | |
81 | #define AS_FAULT_INFO_LED_AMOUNT (1 << 3) | |
82 | #define AS_FAULT_INFO_TIMEOUT (1 << 4) | |
83 | #define AS_FAULT_INFO_OVER_TEMPERATURE (1 << 5) | |
84 | #define AS_FAULT_INFO_SHORT_CIRCUIT (1 << 6) | |
85 | #define AS_FAULT_INFO_OVER_VOLTAGE (1 << 7) | |
86 | ||
87 | /* Boost register */ | |
88 | #define AS_BOOST_REG 0x0d | |
89 | #define AS_BOOST_CURRENT_DISABLE (0 << 0) | |
90 | #define AS_BOOST_CURRENT_ENABLE (1 << 0) | |
91 | ||
92 | /* Password register is used to unlock boost register writing */ | |
93 | #define AS_PASSWORD_REG 0x0f | |
94 | #define AS_PASSWORD_UNLOCK_VALUE 0x55 | |
95 | ||
96 | enum as_mode { | |
97 | AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT, | |
98 | AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT, | |
99 | AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT, | |
100 | AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT, | |
101 | }; | |
102 | ||
103 | /* | |
104 | * struct as3645a | |
105 | * | |
106 | * @subdev: V4L2 subdev | |
107 | * @pdata: Flash platform data | |
108 | * @power_lock: Protects power_count | |
109 | * @power_count: Power reference count | |
110 | * @led_mode: V4L2 flash LED mode | |
111 | * @timeout: Flash timeout in microseconds | |
112 | * @flash_current: Flash current (0=200mA ... 15=500mA). Maximum | |
113 | * values are 400mA for two LEDs and 500mA for one LED. | |
114 | * @assist_current: Torch/Assist light current (0=20mA, 1=40mA ... 7=160mA) | |
115 | * @indicator_current: Indicator LED current (0=0mA, 1=2.5mA ... 4=10mA) | |
116 | * @strobe_source: Flash strobe source (software or external) | |
117 | */ | |
118 | struct as3645a { | |
119 | struct v4l2_subdev subdev; | |
120 | const struct as3645a_platform_data *pdata; | |
121 | ||
122 | struct mutex power_lock; | |
123 | int power_count; | |
124 | ||
125 | /* Controls */ | |
126 | struct v4l2_ctrl_handler ctrls; | |
127 | ||
128 | enum v4l2_flash_led_mode led_mode; | |
129 | unsigned int timeout; | |
130 | u8 flash_current; | |
131 | u8 assist_current; | |
132 | u8 indicator_current; | |
133 | enum v4l2_flash_strobe_source strobe_source; | |
134 | }; | |
135 | ||
136 | #define to_as3645a(sd) container_of(sd, struct as3645a, subdev) | |
137 | ||
138 | /* Return negative errno else zero on success */ | |
139 | static int as3645a_write(struct as3645a *flash, u8 addr, u8 val) | |
140 | { | |
141 | struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); | |
142 | int rval; | |
143 | ||
144 | rval = i2c_smbus_write_byte_data(client, addr, val); | |
145 | ||
146 | dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val, | |
147 | rval < 0 ? "fail" : "ok"); | |
148 | ||
149 | return rval; | |
150 | } | |
151 | ||
152 | /* Return negative errno else a data byte received from the device. */ | |
153 | static int as3645a_read(struct as3645a *flash, u8 addr) | |
154 | { | |
155 | struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); | |
156 | int rval; | |
157 | ||
158 | rval = i2c_smbus_read_byte_data(client, addr); | |
159 | ||
160 | dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval, | |
161 | rval < 0 ? "fail" : "ok"); | |
162 | ||
163 | return rval; | |
164 | } | |
165 | ||
166 | /* ----------------------------------------------------------------------------- | |
167 | * Hardware configuration and trigger | |
168 | */ | |
169 | ||
170 | /* | |
171 | * as3645a_set_config - Set flash configuration registers | |
172 | * @flash: The flash | |
173 | * | |
174 | * Configure the hardware with flash, assist and indicator currents, as well as | |
175 | * flash timeout. | |
176 | * | |
177 | * Return 0 on success, or a negative error code if an I2C communication error | |
178 | * occurred. | |
179 | */ | |
180 | static int as3645a_set_config(struct as3645a *flash) | |
181 | { | |
182 | int ret; | |
183 | u8 val; | |
184 | ||
185 | val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT) | |
186 | | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT) | |
187 | | AS_CURRENT_LED_DET_ON; | |
188 | ||
189 | ret = as3645a_write(flash, AS_CURRENT_SET_REG, val); | |
190 | if (ret < 0) | |
191 | return ret; | |
192 | ||
193 | val = AS_TIMER_MS_TO_CODE(flash->timeout / 1000) | |
194 | << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT; | |
195 | ||
196 | val |= (flash->pdata->vref << AS_INDICATOR_AND_TIMER_VREF_SHIFT) | |
197 | | ((flash->indicator_current ? flash->indicator_current - 1 : 0) | |
198 | << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT); | |
199 | ||
200 | return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val); | |
201 | } | |
202 | ||
203 | /* | |
204 | * as3645a_set_control - Set flash control register | |
205 | * @flash: The flash | |
206 | * @mode: Desired output mode | |
207 | * @on: Desired output state | |
208 | * | |
209 | * Configure the hardware with output mode and state. | |
210 | * | |
211 | * Return 0 on success, or a negative error code if an I2C communication error | |
212 | * occurred. | |
213 | */ | |
214 | static int | |
215 | as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on) | |
216 | { | |
217 | u8 reg; | |
218 | ||
219 | /* Configure output parameters and operation mode. */ | |
220 | reg = (flash->pdata->peak << AS_CONTROL_COIL_PEAK_SHIFT) | |
221 | | (on ? AS_CONTROL_OUT_ON : 0) | |
222 | | mode; | |
223 | ||
224 | if (flash->led_mode == V4L2_FLASH_LED_MODE_FLASH && | |
225 | flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL) { | |
226 | reg |= AS_CONTROL_STROBE_TYPE_LEVEL | |
227 | | AS_CONTROL_STROBE_ON; | |
228 | } | |
229 | ||
230 | return as3645a_write(flash, AS_CONTROL_REG, reg); | |
231 | } | |
232 | ||
233 | /* | |
234 | * as3645a_set_output - Configure output and operation mode | |
235 | * @flash: Flash controller | |
236 | * @strobe: Strobe the flash (only valid in flash mode) | |
237 | * | |
238 | * Turn the LEDs output on/off and set the operation mode based on the current | |
239 | * parameters. | |
240 | * | |
241 | * The AS3645A can't control the indicator LED independently of the flash/torch | |
242 | * LED. If the flash controller is in V4L2_FLASH_LED_MODE_NONE mode, set the | |
243 | * chip to indicator mode. Otherwise set it to assist light (torch) or flash | |
244 | * mode. | |
245 | * | |
246 | * In indicator and assist modes, turn the output on/off based on the indicator | |
247 | * and torch currents. In software strobe flash mode, turn the output on/off | |
248 | * based on the strobe parameter. | |
249 | */ | |
250 | static int as3645a_set_output(struct as3645a *flash, bool strobe) | |
251 | { | |
252 | enum as_mode mode; | |
253 | bool on; | |
254 | ||
255 | switch (flash->led_mode) { | |
256 | case V4L2_FLASH_LED_MODE_NONE: | |
257 | on = flash->indicator_current != 0; | |
258 | mode = AS_MODE_INDICATOR; | |
259 | break; | |
260 | case V4L2_FLASH_LED_MODE_TORCH: | |
261 | on = true; | |
262 | mode = AS_MODE_ASSIST; | |
263 | break; | |
264 | case V4L2_FLASH_LED_MODE_FLASH: | |
265 | on = strobe; | |
266 | mode = AS_MODE_FLASH; | |
267 | break; | |
268 | default: | |
269 | BUG(); | |
270 | } | |
271 | ||
272 | /* Configure output parameters and operation mode. */ | |
273 | return as3645a_set_control(flash, mode, on); | |
274 | } | |
275 | ||
276 | /* ----------------------------------------------------------------------------- | |
277 | * V4L2 controls | |
278 | */ | |
279 | ||
280 | static int as3645a_is_active(struct as3645a *flash) | |
281 | { | |
282 | int ret; | |
283 | ||
284 | ret = as3645a_read(flash, AS_CONTROL_REG); | |
285 | return ret < 0 ? ret : !!(ret & AS_CONTROL_OUT_ON); | |
286 | } | |
287 | ||
288 | static int as3645a_read_fault(struct as3645a *flash) | |
289 | { | |
290 | struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); | |
291 | int rval; | |
292 | ||
293 | /* NOTE: reading register clear fault status */ | |
294 | rval = as3645a_read(flash, AS_FAULT_INFO_REG); | |
295 | if (rval < 0) | |
296 | return rval; | |
297 | ||
298 | if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT) | |
299 | dev_dbg(&client->dev, "Inductor Peak limit fault\n"); | |
300 | ||
301 | if (rval & AS_FAULT_INFO_INDICATOR_LED) | |
302 | dev_dbg(&client->dev, "Indicator LED fault: " | |
303 | "Short circuit or open loop\n"); | |
304 | ||
305 | dev_dbg(&client->dev, "%u connected LEDs\n", | |
306 | rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1); | |
307 | ||
308 | if (rval & AS_FAULT_INFO_TIMEOUT) | |
309 | dev_dbg(&client->dev, "Timeout fault\n"); | |
310 | ||
311 | if (rval & AS_FAULT_INFO_OVER_TEMPERATURE) | |
312 | dev_dbg(&client->dev, "Over temperature fault\n"); | |
313 | ||
314 | if (rval & AS_FAULT_INFO_SHORT_CIRCUIT) | |
315 | dev_dbg(&client->dev, "Short circuit fault\n"); | |
316 | ||
317 | if (rval & AS_FAULT_INFO_OVER_VOLTAGE) | |
318 | dev_dbg(&client->dev, "Over voltage fault: " | |
319 | "Indicates missing capacitor or open connection\n"); | |
320 | ||
321 | return rval; | |
322 | } | |
323 | ||
324 | static int as3645a_get_ctrl(struct v4l2_ctrl *ctrl) | |
325 | { | |
326 | struct as3645a *flash = | |
327 | container_of(ctrl->handler, struct as3645a, ctrls); | |
328 | struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); | |
329 | int value; | |
330 | ||
331 | switch (ctrl->id) { | |
332 | case V4L2_CID_FLASH_FAULT: | |
333 | value = as3645a_read_fault(flash); | |
334 | if (value < 0) | |
335 | return value; | |
336 | ||
337 | ctrl->cur.val = 0; | |
338 | if (value & AS_FAULT_INFO_SHORT_CIRCUIT) | |
339 | ctrl->cur.val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT; | |
340 | if (value & AS_FAULT_INFO_OVER_TEMPERATURE) | |
341 | ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE; | |
342 | if (value & AS_FAULT_INFO_TIMEOUT) | |
343 | ctrl->cur.val |= V4L2_FLASH_FAULT_TIMEOUT; | |
344 | if (value & AS_FAULT_INFO_OVER_VOLTAGE) | |
345 | ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_VOLTAGE; | |
346 | if (value & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT) | |
347 | ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_CURRENT; | |
348 | if (value & AS_FAULT_INFO_INDICATOR_LED) | |
349 | ctrl->cur.val |= V4L2_FLASH_FAULT_INDICATOR; | |
350 | break; | |
351 | ||
352 | case V4L2_CID_FLASH_STROBE_STATUS: | |
353 | if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH) { | |
354 | ctrl->cur.val = 0; | |
355 | break; | |
356 | } | |
357 | ||
358 | value = as3645a_is_active(flash); | |
359 | if (value < 0) | |
360 | return value; | |
361 | ||
362 | ctrl->cur.val = value; | |
363 | break; | |
364 | } | |
365 | ||
366 | dev_dbg(&client->dev, "G_CTRL %08x:%d\n", ctrl->id, ctrl->cur.val); | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | static int as3645a_set_ctrl(struct v4l2_ctrl *ctrl) | |
372 | { | |
373 | struct as3645a *flash = | |
374 | container_of(ctrl->handler, struct as3645a, ctrls); | |
375 | struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); | |
376 | int ret; | |
377 | ||
378 | dev_dbg(&client->dev, "S_CTRL %08x:%d\n", ctrl->id, ctrl->val); | |
379 | ||
380 | /* If a control that doesn't apply to the current mode is modified, | |
381 | * we store the value and return immediately. The setting will be | |
382 | * applied when the LED mode is changed. Otherwise we apply the setting | |
383 | * immediately. | |
384 | */ | |
385 | ||
386 | switch (ctrl->id) { | |
387 | case V4L2_CID_FLASH_LED_MODE: | |
388 | if (flash->indicator_current) | |
389 | return -EBUSY; | |
390 | ||
391 | ret = as3645a_set_config(flash); | |
392 | if (ret < 0) | |
393 | return ret; | |
394 | ||
395 | flash->led_mode = ctrl->val; | |
396 | return as3645a_set_output(flash, false); | |
397 | ||
398 | case V4L2_CID_FLASH_STROBE_SOURCE: | |
399 | flash->strobe_source = ctrl->val; | |
400 | ||
401 | /* Applies to flash mode only. */ | |
402 | if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH) | |
403 | break; | |
404 | ||
405 | return as3645a_set_output(flash, false); | |
406 | ||
407 | case V4L2_CID_FLASH_STROBE: | |
408 | if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH) | |
409 | return -EBUSY; | |
410 | ||
411 | return as3645a_set_output(flash, true); | |
412 | ||
413 | case V4L2_CID_FLASH_STROBE_STOP: | |
414 | if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH) | |
415 | return -EBUSY; | |
416 | ||
417 | return as3645a_set_output(flash, false); | |
418 | ||
419 | case V4L2_CID_FLASH_TIMEOUT: | |
420 | flash->timeout = ctrl->val; | |
421 | ||
422 | /* Applies to flash mode only. */ | |
423 | if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH) | |
424 | break; | |
425 | ||
426 | return as3645a_set_config(flash); | |
427 | ||
428 | case V4L2_CID_FLASH_INTENSITY: | |
429 | flash->flash_current = (ctrl->val - AS3645A_FLASH_INTENSITY_MIN) | |
430 | / AS3645A_FLASH_INTENSITY_STEP; | |
431 | ||
432 | /* Applies to flash mode only. */ | |
433 | if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH) | |
434 | break; | |
435 | ||
436 | return as3645a_set_config(flash); | |
437 | ||
438 | case V4L2_CID_FLASH_TORCH_INTENSITY: | |
439 | flash->assist_current = | |
440 | (ctrl->val - AS3645A_TORCH_INTENSITY_MIN) | |
441 | / AS3645A_TORCH_INTENSITY_STEP; | |
442 | ||
443 | /* Applies to torch mode only. */ | |
444 | if (flash->led_mode != V4L2_FLASH_LED_MODE_TORCH) | |
445 | break; | |
446 | ||
447 | return as3645a_set_config(flash); | |
448 | ||
449 | case V4L2_CID_FLASH_INDICATOR_INTENSITY: | |
450 | if (flash->led_mode != V4L2_FLASH_LED_MODE_NONE) | |
451 | return -EBUSY; | |
452 | ||
453 | flash->indicator_current = | |
454 | (ctrl->val - AS3645A_INDICATOR_INTENSITY_MIN) | |
455 | / AS3645A_INDICATOR_INTENSITY_STEP; | |
456 | ||
457 | ret = as3645a_set_config(flash); | |
458 | if (ret < 0) | |
459 | return ret; | |
460 | ||
461 | if ((ctrl->val == 0) == (ctrl->cur.val == 0)) | |
462 | break; | |
463 | ||
464 | return as3645a_set_output(flash, false); | |
465 | } | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
470 | static const struct v4l2_ctrl_ops as3645a_ctrl_ops = { | |
471 | .g_volatile_ctrl = as3645a_get_ctrl, | |
472 | .s_ctrl = as3645a_set_ctrl, | |
473 | }; | |
474 | ||
475 | /* ----------------------------------------------------------------------------- | |
476 | * V4L2 subdev core operations | |
477 | */ | |
478 | ||
479 | /* Put device into know state. */ | |
480 | static int as3645a_setup(struct as3645a *flash) | |
481 | { | |
482 | struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); | |
483 | int ret; | |
484 | ||
485 | /* clear errors */ | |
486 | ret = as3645a_read(flash, AS_FAULT_INFO_REG); | |
487 | if (ret < 0) | |
488 | return ret; | |
489 | ||
490 | dev_dbg(&client->dev, "Fault info: %02x\n", ret); | |
491 | ||
492 | ret = as3645a_set_config(flash); | |
493 | if (ret < 0) | |
494 | return ret; | |
495 | ||
496 | ret = as3645a_set_output(flash, false); | |
497 | if (ret < 0) | |
498 | return ret; | |
499 | ||
500 | /* read status */ | |
501 | ret = as3645a_read_fault(flash); | |
502 | if (ret < 0) | |
503 | return ret; | |
504 | ||
505 | dev_dbg(&client->dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n", | |
506 | as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG)); | |
507 | dev_dbg(&client->dev, "AS_CURRENT_SET_REG: %02x\n", | |
508 | as3645a_read(flash, AS_CURRENT_SET_REG)); | |
509 | dev_dbg(&client->dev, "AS_CONTROL_REG: %02x\n", | |
510 | as3645a_read(flash, AS_CONTROL_REG)); | |
511 | ||
512 | return ret & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0; | |
513 | } | |
514 | ||
515 | static int __as3645a_set_power(struct as3645a *flash, int on) | |
516 | { | |
517 | int ret; | |
518 | ||
519 | if (!on) | |
520 | as3645a_set_control(flash, AS_MODE_EXT_TORCH, false); | |
521 | ||
522 | if (flash->pdata->set_power) { | |
523 | ret = flash->pdata->set_power(&flash->subdev, on); | |
524 | if (ret < 0) | |
525 | return ret; | |
526 | } | |
527 | ||
528 | if (!on) | |
529 | return 0; | |
530 | ||
531 | ret = as3645a_setup(flash); | |
532 | if (ret < 0) { | |
533 | if (flash->pdata->set_power) | |
534 | flash->pdata->set_power(&flash->subdev, 0); | |
535 | } | |
536 | ||
537 | return ret; | |
538 | } | |
539 | ||
540 | static int as3645a_set_power(struct v4l2_subdev *sd, int on) | |
541 | { | |
542 | struct as3645a *flash = to_as3645a(sd); | |
543 | int ret = 0; | |
544 | ||
545 | mutex_lock(&flash->power_lock); | |
546 | ||
547 | if (flash->power_count == !on) { | |
548 | ret = __as3645a_set_power(flash, !!on); | |
549 | if (ret < 0) | |
550 | goto done; | |
551 | } | |
552 | ||
553 | flash->power_count += on ? 1 : -1; | |
554 | WARN_ON(flash->power_count < 0); | |
555 | ||
556 | done: | |
557 | mutex_unlock(&flash->power_lock); | |
558 | return ret; | |
559 | } | |
560 | ||
561 | static int as3645a_registered(struct v4l2_subdev *sd) | |
562 | { | |
563 | struct as3645a *flash = to_as3645a(sd); | |
564 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
565 | int rval, man, model, rfu, version; | |
566 | const char *vendor; | |
567 | ||
568 | /* Power up the flash driver and read manufacturer ID, model ID, RFU | |
569 | * and version. | |
570 | */ | |
571 | rval = as3645a_set_power(&flash->subdev, 1); | |
572 | if (rval < 0) | |
573 | return rval; | |
574 | ||
575 | rval = as3645a_read(flash, AS_DESIGN_INFO_REG); | |
576 | if (rval < 0) | |
577 | goto power_off; | |
578 | ||
579 | man = AS_DESIGN_INFO_FACTORY(rval); | |
580 | model = AS_DESIGN_INFO_MODEL(rval); | |
581 | ||
582 | rval = as3645a_read(flash, AS_VERSION_CONTROL_REG); | |
583 | if (rval < 0) | |
584 | goto power_off; | |
585 | ||
586 | rfu = AS_VERSION_CONTROL_RFU(rval); | |
587 | version = AS_VERSION_CONTROL_VERSION(rval); | |
588 | ||
589 | /* Verify the chip model and version. */ | |
590 | if (model != 0x01 || rfu != 0x00) { | |
591 | dev_err(&client->dev, "AS3645A not detected " | |
592 | "(model %d rfu %d)\n", model, rfu); | |
593 | rval = -ENODEV; | |
594 | goto power_off; | |
595 | } | |
596 | ||
597 | switch (man) { | |
598 | case 1: | |
599 | vendor = "AMS, Austria Micro Systems"; | |
600 | break; | |
601 | case 2: | |
602 | vendor = "ADI, Analog Devices Inc."; | |
603 | break; | |
604 | case 3: | |
605 | vendor = "NSC, National Semiconductor"; | |
606 | break; | |
607 | case 4: | |
608 | vendor = "NXP"; | |
609 | break; | |
610 | case 5: | |
611 | vendor = "TI, Texas Instrument"; | |
612 | break; | |
613 | default: | |
614 | vendor = "Unknown"; | |
615 | } | |
616 | ||
617 | dev_info(&client->dev, "Chip vendor: %s (%d) Version: %d\n", vendor, | |
618 | man, version); | |
619 | ||
620 | rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE); | |
621 | if (rval < 0) | |
622 | goto power_off; | |
623 | ||
624 | rval = as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE); | |
625 | if (rval < 0) | |
626 | goto power_off; | |
627 | ||
628 | /* Setup default values. This makes sure that the chip is in a known | |
629 | * state, in case the power rail can't be controlled. | |
630 | */ | |
631 | rval = as3645a_setup(flash); | |
632 | ||
633 | power_off: | |
634 | as3645a_set_power(&flash->subdev, 0); | |
635 | ||
636 | return rval; | |
637 | } | |
638 | ||
639 | static int as3645a_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) | |
640 | { | |
641 | return as3645a_set_power(sd, 1); | |
642 | } | |
643 | ||
644 | static int as3645a_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) | |
645 | { | |
646 | return as3645a_set_power(sd, 0); | |
647 | } | |
648 | ||
649 | static const struct v4l2_subdev_core_ops as3645a_core_ops = { | |
650 | .s_power = as3645a_set_power, | |
651 | }; | |
652 | ||
653 | static const struct v4l2_subdev_ops as3645a_ops = { | |
654 | .core = &as3645a_core_ops, | |
655 | }; | |
656 | ||
657 | static const struct v4l2_subdev_internal_ops as3645a_internal_ops = { | |
658 | .registered = as3645a_registered, | |
659 | .open = as3645a_open, | |
660 | .close = as3645a_close, | |
661 | }; | |
662 | ||
663 | /* ----------------------------------------------------------------------------- | |
664 | * I2C driver | |
665 | */ | |
666 | #ifdef CONFIG_PM | |
667 | ||
668 | static int as3645a_suspend(struct device *dev) | |
669 | { | |
670 | struct i2c_client *client = to_i2c_client(dev); | |
671 | struct v4l2_subdev *subdev = i2c_get_clientdata(client); | |
672 | struct as3645a *flash = to_as3645a(subdev); | |
673 | int rval; | |
674 | ||
675 | if (flash->power_count == 0) | |
676 | return 0; | |
677 | ||
678 | rval = __as3645a_set_power(flash, 0); | |
679 | ||
680 | dev_dbg(&client->dev, "Suspend %s\n", rval < 0 ? "failed" : "ok"); | |
681 | ||
682 | return rval; | |
683 | } | |
684 | ||
685 | static int as3645a_resume(struct device *dev) | |
686 | { | |
687 | struct i2c_client *client = to_i2c_client(dev); | |
688 | struct v4l2_subdev *subdev = i2c_get_clientdata(client); | |
689 | struct as3645a *flash = to_as3645a(subdev); | |
690 | int rval; | |
691 | ||
692 | if (flash->power_count == 0) | |
693 | return 0; | |
694 | ||
695 | rval = __as3645a_set_power(flash, 1); | |
696 | ||
697 | dev_dbg(&client->dev, "Resume %s\n", rval < 0 ? "fail" : "ok"); | |
698 | ||
699 | return rval; | |
700 | } | |
701 | ||
702 | #else | |
703 | ||
704 | #define as3645a_suspend NULL | |
705 | #define as3645a_resume NULL | |
706 | ||
707 | #endif /* CONFIG_PM */ | |
708 | ||
709 | /* | |
710 | * as3645a_init_controls - Create controls | |
711 | * @flash: The flash | |
712 | * | |
713 | * The number of LEDs reported in platform data is used to compute default | |
714 | * limits. Parameters passed through platform data can override those limits. | |
715 | */ | |
4c62e976 | 716 | static int as3645a_init_controls(struct as3645a *flash) |
22db44cb LP |
717 | { |
718 | const struct as3645a_platform_data *pdata = flash->pdata; | |
719 | struct v4l2_ctrl *ctrl; | |
720 | int maximum; | |
721 | ||
722 | v4l2_ctrl_handler_init(&flash->ctrls, 10); | |
723 | ||
724 | /* V4L2_CID_FLASH_LED_MODE */ | |
725 | v4l2_ctrl_new_std_menu(&flash->ctrls, &as3645a_ctrl_ops, | |
726 | V4L2_CID_FLASH_LED_MODE, 2, ~7, | |
727 | V4L2_FLASH_LED_MODE_NONE); | |
728 | ||
729 | /* V4L2_CID_FLASH_STROBE_SOURCE */ | |
730 | v4l2_ctrl_new_std_menu(&flash->ctrls, &as3645a_ctrl_ops, | |
731 | V4L2_CID_FLASH_STROBE_SOURCE, | |
732 | pdata->ext_strobe ? 1 : 0, | |
733 | pdata->ext_strobe ? ~3 : ~1, | |
734 | V4L2_FLASH_STROBE_SOURCE_SOFTWARE); | |
735 | ||
736 | flash->strobe_source = V4L2_FLASH_STROBE_SOURCE_SOFTWARE; | |
737 | ||
738 | /* V4L2_CID_FLASH_STROBE */ | |
739 | v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops, | |
740 | V4L2_CID_FLASH_STROBE, 0, 0, 0, 0); | |
741 | ||
742 | /* V4L2_CID_FLASH_STROBE_STOP */ | |
743 | v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops, | |
744 | V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0); | |
745 | ||
746 | /* V4L2_CID_FLASH_STROBE_STATUS */ | |
747 | ctrl = v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops, | |
748 | V4L2_CID_FLASH_STROBE_STATUS, 0, 1, 1, 1); | |
749 | if (ctrl != NULL) | |
750 | ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE; | |
751 | ||
752 | /* V4L2_CID_FLASH_TIMEOUT */ | |
753 | maximum = pdata->timeout_max; | |
754 | ||
755 | v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops, | |
756 | V4L2_CID_FLASH_TIMEOUT, AS3645A_FLASH_TIMEOUT_MIN, | |
757 | maximum, AS3645A_FLASH_TIMEOUT_STEP, maximum); | |
758 | ||
759 | flash->timeout = maximum; | |
760 | ||
761 | /* V4L2_CID_FLASH_INTENSITY */ | |
762 | maximum = pdata->flash_max_current; | |
763 | ||
764 | v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops, | |
765 | V4L2_CID_FLASH_INTENSITY, AS3645A_FLASH_INTENSITY_MIN, | |
766 | maximum, AS3645A_FLASH_INTENSITY_STEP, maximum); | |
767 | ||
768 | flash->flash_current = (maximum - AS3645A_FLASH_INTENSITY_MIN) | |
769 | / AS3645A_FLASH_INTENSITY_STEP; | |
770 | ||
771 | /* V4L2_CID_FLASH_TORCH_INTENSITY */ | |
772 | maximum = pdata->torch_max_current; | |
773 | ||
774 | v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops, | |
775 | V4L2_CID_FLASH_TORCH_INTENSITY, | |
776 | AS3645A_TORCH_INTENSITY_MIN, maximum, | |
777 | AS3645A_TORCH_INTENSITY_STEP, | |
778 | AS3645A_TORCH_INTENSITY_MIN); | |
779 | ||
780 | flash->assist_current = 0; | |
781 | ||
782 | /* V4L2_CID_FLASH_INDICATOR_INTENSITY */ | |
783 | v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops, | |
784 | V4L2_CID_FLASH_INDICATOR_INTENSITY, | |
785 | AS3645A_INDICATOR_INTENSITY_MIN, | |
786 | AS3645A_INDICATOR_INTENSITY_MAX, | |
787 | AS3645A_INDICATOR_INTENSITY_STEP, | |
788 | AS3645A_INDICATOR_INTENSITY_MIN); | |
789 | ||
790 | flash->indicator_current = 0; | |
791 | ||
792 | /* V4L2_CID_FLASH_FAULT */ | |
793 | ctrl = v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops, | |
794 | V4L2_CID_FLASH_FAULT, 0, | |
795 | V4L2_FLASH_FAULT_OVER_VOLTAGE | | |
796 | V4L2_FLASH_FAULT_TIMEOUT | | |
797 | V4L2_FLASH_FAULT_OVER_TEMPERATURE | | |
798 | V4L2_FLASH_FAULT_SHORT_CIRCUIT, 0, 0); | |
799 | if (ctrl != NULL) | |
800 | ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE; | |
801 | ||
802 | flash->subdev.ctrl_handler = &flash->ctrls; | |
803 | ||
804 | return flash->ctrls.error; | |
805 | } | |
806 | ||
4c62e976 GKH |
807 | static int as3645a_probe(struct i2c_client *client, |
808 | const struct i2c_device_id *devid) | |
22db44cb LP |
809 | { |
810 | struct as3645a *flash; | |
811 | int ret; | |
812 | ||
813 | if (client->dev.platform_data == NULL) | |
814 | return -ENODEV; | |
815 | ||
c02b211d | 816 | flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL); |
22db44cb LP |
817 | if (flash == NULL) |
818 | return -ENOMEM; | |
819 | ||
820 | flash->pdata = client->dev.platform_data; | |
821 | ||
822 | v4l2_i2c_subdev_init(&flash->subdev, client, &as3645a_ops); | |
823 | flash->subdev.internal_ops = &as3645a_internal_ops; | |
824 | flash->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; | |
825 | ||
826 | ret = as3645a_init_controls(flash); | |
827 | if (ret < 0) | |
828 | goto done; | |
829 | ||
830 | ret = media_entity_init(&flash->subdev.entity, 0, NULL, 0); | |
831 | if (ret < 0) | |
832 | goto done; | |
833 | ||
834 | flash->subdev.entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH; | |
835 | ||
836 | mutex_init(&flash->power_lock); | |
837 | ||
838 | flash->led_mode = V4L2_FLASH_LED_MODE_NONE; | |
839 | ||
840 | done: | |
c02b211d | 841 | if (ret < 0) |
22db44cb | 842 | v4l2_ctrl_handler_free(&flash->ctrls); |
22db44cb LP |
843 | |
844 | return ret; | |
845 | } | |
846 | ||
4c62e976 | 847 | static int as3645a_remove(struct i2c_client *client) |
22db44cb LP |
848 | { |
849 | struct v4l2_subdev *subdev = i2c_get_clientdata(client); | |
850 | struct as3645a *flash = to_as3645a(subdev); | |
851 | ||
852 | v4l2_device_unregister_subdev(subdev); | |
853 | v4l2_ctrl_handler_free(&flash->ctrls); | |
854 | media_entity_cleanup(&flash->subdev.entity); | |
855 | mutex_destroy(&flash->power_lock); | |
22db44cb LP |
856 | |
857 | return 0; | |
858 | } | |
859 | ||
860 | static const struct i2c_device_id as3645a_id_table[] = { | |
861 | { AS3645A_NAME, 0 }, | |
862 | { }, | |
863 | }; | |
864 | MODULE_DEVICE_TABLE(i2c, as3645a_id_table); | |
865 | ||
866 | static const struct dev_pm_ops as3645a_pm_ops = { | |
867 | .suspend = as3645a_suspend, | |
868 | .resume = as3645a_resume, | |
869 | }; | |
870 | ||
871 | static struct i2c_driver as3645a_i2c_driver = { | |
872 | .driver = { | |
873 | .name = AS3645A_NAME, | |
874 | .pm = &as3645a_pm_ops, | |
875 | }, | |
876 | .probe = as3645a_probe, | |
4c62e976 | 877 | .remove = as3645a_remove, |
22db44cb LP |
878 | .id_table = as3645a_id_table, |
879 | }; | |
880 | ||
c6e8d86f | 881 | module_i2c_driver(as3645a_i2c_driver); |
22db44cb LP |
882 | |
883 | MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); | |
884 | MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones"); | |
885 | MODULE_LICENSE("GPL"); |