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1 | /* | |
2 | * Driver for MT9M001 CMOS Image Sensor from Micron | |
3 | * | |
4 | * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/videodev2.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/i2c.h> | |
14 | #include <linux/log2.h> | |
15 | #include <linux/gpio.h> | |
16 | ||
17 | #include <media/v4l2-common.h> | |
18 | #include <media/v4l2-chip-ident.h> | |
19 | #include <media/soc_camera.h> | |
20 | ||
21 | /* mt9m001 i2c address 0x5d | |
22 | * The platform has to define i2c_board_info | |
23 | * and call i2c_register_board_info() */ | |
24 | ||
25 | /* mt9m001 selected register addresses */ | |
26 | #define MT9M001_CHIP_VERSION 0x00 | |
27 | #define MT9M001_ROW_START 0x01 | |
28 | #define MT9M001_COLUMN_START 0x02 | |
29 | #define MT9M001_WINDOW_HEIGHT 0x03 | |
30 | #define MT9M001_WINDOW_WIDTH 0x04 | |
31 | #define MT9M001_HORIZONTAL_BLANKING 0x05 | |
32 | #define MT9M001_VERTICAL_BLANKING 0x06 | |
33 | #define MT9M001_OUTPUT_CONTROL 0x07 | |
34 | #define MT9M001_SHUTTER_WIDTH 0x09 | |
35 | #define MT9M001_FRAME_RESTART 0x0b | |
36 | #define MT9M001_SHUTTER_DELAY 0x0c | |
37 | #define MT9M001_RESET 0x0d | |
38 | #define MT9M001_READ_OPTIONS1 0x1e | |
39 | #define MT9M001_READ_OPTIONS2 0x20 | |
40 | #define MT9M001_GLOBAL_GAIN 0x35 | |
41 | #define MT9M001_CHIP_ENABLE 0xF1 | |
42 | ||
43 | static const struct soc_camera_data_format mt9m001_colour_formats[] = { | |
44 | /* Order important: first natively supported, | |
45 | * second supported with a GPIO extender */ | |
46 | { | |
47 | .name = "Bayer (sRGB) 10 bit", | |
48 | .depth = 10, | |
49 | .fourcc = V4L2_PIX_FMT_SBGGR16, | |
50 | .colorspace = V4L2_COLORSPACE_SRGB, | |
51 | }, { | |
52 | .name = "Bayer (sRGB) 8 bit", | |
53 | .depth = 8, | |
54 | .fourcc = V4L2_PIX_FMT_SBGGR8, | |
55 | .colorspace = V4L2_COLORSPACE_SRGB, | |
56 | } | |
57 | }; | |
58 | ||
59 | static const struct soc_camera_data_format mt9m001_monochrome_formats[] = { | |
60 | /* Order important - see above */ | |
61 | { | |
62 | .name = "Monochrome 10 bit", | |
63 | .depth = 10, | |
64 | .fourcc = V4L2_PIX_FMT_Y16, | |
65 | }, { | |
66 | .name = "Monochrome 8 bit", | |
67 | .depth = 8, | |
68 | .fourcc = V4L2_PIX_FMT_GREY, | |
69 | }, | |
70 | }; | |
71 | ||
72 | struct mt9m001 { | |
73 | struct i2c_client *client; | |
74 | struct soc_camera_device icd; | |
75 | int model; /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */ | |
76 | int switch_gpio; | |
77 | unsigned char autoexposure; | |
78 | unsigned char datawidth; | |
79 | }; | |
80 | ||
81 | static int reg_read(struct soc_camera_device *icd, const u8 reg) | |
82 | { | |
83 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
84 | struct i2c_client *client = mt9m001->client; | |
85 | s32 data = i2c_smbus_read_word_data(client, reg); | |
86 | return data < 0 ? data : swab16(data); | |
87 | } | |
88 | ||
89 | static int reg_write(struct soc_camera_device *icd, const u8 reg, | |
90 | const u16 data) | |
91 | { | |
92 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
93 | return i2c_smbus_write_word_data(mt9m001->client, reg, swab16(data)); | |
94 | } | |
95 | ||
96 | static int reg_set(struct soc_camera_device *icd, const u8 reg, | |
97 | const u16 data) | |
98 | { | |
99 | int ret; | |
100 | ||
101 | ret = reg_read(icd, reg); | |
102 | if (ret < 0) | |
103 | return ret; | |
104 | return reg_write(icd, reg, ret | data); | |
105 | } | |
106 | ||
107 | static int reg_clear(struct soc_camera_device *icd, const u8 reg, | |
108 | const u16 data) | |
109 | { | |
110 | int ret; | |
111 | ||
112 | ret = reg_read(icd, reg); | |
113 | if (ret < 0) | |
114 | return ret; | |
115 | return reg_write(icd, reg, ret & ~data); | |
116 | } | |
117 | ||
118 | static int mt9m001_init(struct soc_camera_device *icd) | |
119 | { | |
120 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
121 | struct soc_camera_link *icl = mt9m001->client->dev.platform_data; | |
122 | int ret; | |
123 | ||
124 | dev_dbg(icd->vdev->parent, "%s\n", __func__); | |
125 | ||
126 | if (icl->power) { | |
127 | ret = icl->power(&mt9m001->client->dev, 1); | |
128 | if (ret < 0) { | |
129 | dev_err(icd->vdev->parent, | |
130 | "Platform failed to power-on the camera.\n"); | |
131 | return ret; | |
132 | } | |
133 | } | |
134 | ||
135 | /* The camera could have been already on, we reset it additionally */ | |
136 | if (icl->reset) | |
137 | ret = icl->reset(&mt9m001->client->dev); | |
138 | else | |
139 | ret = -ENODEV; | |
140 | ||
141 | if (ret < 0) { | |
142 | /* Either no platform reset, or platform reset failed */ | |
143 | ret = reg_write(icd, MT9M001_RESET, 1); | |
144 | if (!ret) | |
145 | ret = reg_write(icd, MT9M001_RESET, 0); | |
146 | } | |
147 | /* Disable chip, synchronous option update */ | |
148 | if (!ret) | |
149 | ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0); | |
150 | ||
151 | return ret; | |
152 | } | |
153 | ||
154 | static int mt9m001_release(struct soc_camera_device *icd) | |
155 | { | |
156 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
157 | struct soc_camera_link *icl = mt9m001->client->dev.platform_data; | |
158 | ||
159 | /* Disable the chip */ | |
160 | reg_write(icd, MT9M001_OUTPUT_CONTROL, 0); | |
161 | ||
162 | if (icl->power) | |
163 | icl->power(&mt9m001->client->dev, 0); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | static int mt9m001_start_capture(struct soc_camera_device *icd) | |
169 | { | |
170 | /* Switch to master "normal" mode */ | |
171 | if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0) | |
172 | return -EIO; | |
173 | return 0; | |
174 | } | |
175 | ||
176 | static int mt9m001_stop_capture(struct soc_camera_device *icd) | |
177 | { | |
178 | /* Stop sensor readout */ | |
179 | if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0) | |
180 | return -EIO; | |
181 | return 0; | |
182 | } | |
183 | ||
184 | static int bus_switch_request(struct mt9m001 *mt9m001, | |
185 | struct soc_camera_link *icl) | |
186 | { | |
187 | #ifdef CONFIG_MT9M001_PCA9536_SWITCH | |
188 | int ret; | |
189 | unsigned int gpio = icl->gpio; | |
190 | ||
191 | if (gpio_is_valid(gpio)) { | |
192 | /* We have a data bus switch. */ | |
193 | ret = gpio_request(gpio, "mt9m001"); | |
194 | if (ret < 0) { | |
195 | dev_err(&mt9m001->client->dev, "Cannot get GPIO %u\n", | |
196 | gpio); | |
197 | return ret; | |
198 | } | |
199 | ||
200 | ret = gpio_direction_output(gpio, 0); | |
201 | if (ret < 0) { | |
202 | dev_err(&mt9m001->client->dev, | |
203 | "Cannot set GPIO %u to output\n", gpio); | |
204 | gpio_free(gpio); | |
205 | return ret; | |
206 | } | |
207 | } | |
208 | ||
209 | mt9m001->switch_gpio = gpio; | |
210 | #else | |
211 | mt9m001->switch_gpio = -EINVAL; | |
212 | #endif | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static void bus_switch_release(struct mt9m001 *mt9m001) | |
217 | { | |
218 | #ifdef CONFIG_MT9M001_PCA9536_SWITCH | |
219 | if (gpio_is_valid(mt9m001->switch_gpio)) | |
220 | gpio_free(mt9m001->switch_gpio); | |
221 | #endif | |
222 | } | |
223 | ||
224 | static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit) | |
225 | { | |
226 | #ifdef CONFIG_MT9M001_PCA9536_SWITCH | |
227 | if (!gpio_is_valid(mt9m001->switch_gpio)) | |
228 | return -ENODEV; | |
229 | ||
230 | gpio_set_value_cansleep(mt9m001->switch_gpio, go8bit); | |
231 | return 0; | |
232 | #else | |
233 | return -ENODEV; | |
234 | #endif | |
235 | } | |
236 | ||
237 | static int bus_switch_possible(struct mt9m001 *mt9m001) | |
238 | { | |
239 | #ifdef CONFIG_MT9M001_PCA9536_SWITCH | |
240 | return gpio_is_valid(mt9m001->switch_gpio); | |
241 | #else | |
242 | return 0; | |
243 | #endif | |
244 | } | |
245 | ||
246 | static int mt9m001_set_bus_param(struct soc_camera_device *icd, | |
247 | unsigned long flags) | |
248 | { | |
249 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
250 | unsigned int width_flag = flags & SOCAM_DATAWIDTH_MASK; | |
251 | int ret; | |
252 | ||
253 | /* Flags validity verified in test_bus_param */ | |
254 | ||
255 | if ((mt9m001->datawidth != 10 && (width_flag == SOCAM_DATAWIDTH_10)) || | |
256 | (mt9m001->datawidth != 9 && (width_flag == SOCAM_DATAWIDTH_9)) || | |
257 | (mt9m001->datawidth != 8 && (width_flag == SOCAM_DATAWIDTH_8))) { | |
258 | /* Well, we actually only can do 10 or 8 bits... */ | |
259 | if (width_flag == SOCAM_DATAWIDTH_9) | |
260 | return -EINVAL; | |
261 | ret = bus_switch_act(mt9m001, | |
262 | width_flag == SOCAM_DATAWIDTH_8); | |
263 | if (ret < 0) | |
264 | return ret; | |
265 | ||
266 | mt9m001->datawidth = width_flag == SOCAM_DATAWIDTH_8 ? 8 : 10; | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static unsigned long mt9m001_query_bus_param(struct soc_camera_device *icd) | |
273 | { | |
274 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
275 | struct soc_camera_link *icl = mt9m001->client->dev.platform_data; | |
276 | /* MT9M001 has all capture_format parameters fixed */ | |
277 | unsigned long flags = SOCAM_DATAWIDTH_10 | SOCAM_PCLK_SAMPLE_RISING | | |
278 | SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_HIGH | | |
279 | SOCAM_MASTER; | |
280 | ||
281 | if (bus_switch_possible(mt9m001)) | |
282 | flags |= SOCAM_DATAWIDTH_8; | |
283 | ||
284 | return soc_camera_apply_sensor_flags(icl, flags); | |
285 | } | |
286 | ||
287 | static int mt9m001_set_fmt(struct soc_camera_device *icd, | |
288 | __u32 pixfmt, struct v4l2_rect *rect) | |
289 | { | |
290 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
291 | int ret; | |
292 | const u16 hblank = 9, vblank = 25; | |
293 | ||
294 | /* Blanking and start values - default... */ | |
295 | ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank); | |
296 | if (!ret) | |
297 | ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank); | |
298 | ||
299 | /* The caller provides a supported format, as verified per | |
300 | * call to icd->try_fmt() */ | |
301 | if (!ret) | |
302 | ret = reg_write(icd, MT9M001_COLUMN_START, rect->left); | |
303 | if (!ret) | |
304 | ret = reg_write(icd, MT9M001_ROW_START, rect->top); | |
305 | if (!ret) | |
306 | ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1); | |
307 | if (!ret) | |
308 | ret = reg_write(icd, MT9M001_WINDOW_HEIGHT, | |
309 | rect->height + icd->y_skip_top - 1); | |
310 | if (!ret && mt9m001->autoexposure) { | |
311 | ret = reg_write(icd, MT9M001_SHUTTER_WIDTH, | |
312 | rect->height + icd->y_skip_top + vblank); | |
313 | if (!ret) { | |
314 | const struct v4l2_queryctrl *qctrl = | |
315 | soc_camera_find_qctrl(icd->ops, | |
316 | V4L2_CID_EXPOSURE); | |
317 | icd->exposure = (524 + (rect->height + icd->y_skip_top + | |
318 | vblank - 1) * | |
319 | (qctrl->maximum - qctrl->minimum)) / | |
320 | 1048 + qctrl->minimum; | |
321 | } | |
322 | } | |
323 | ||
324 | return ret; | |
325 | } | |
326 | ||
327 | static int mt9m001_try_fmt(struct soc_camera_device *icd, | |
328 | struct v4l2_format *f) | |
329 | { | |
330 | struct v4l2_pix_format *pix = &f->fmt.pix; | |
331 | ||
332 | if (pix->height < 32 + icd->y_skip_top) | |
333 | pix->height = 32 + icd->y_skip_top; | |
334 | if (pix->height > 1024 + icd->y_skip_top) | |
335 | pix->height = 1024 + icd->y_skip_top; | |
336 | if (pix->width < 48) | |
337 | pix->width = 48; | |
338 | if (pix->width > 1280) | |
339 | pix->width = 1280; | |
340 | pix->width &= ~0x01; /* has to be even, unsure why was ~3 */ | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | static int mt9m001_get_chip_id(struct soc_camera_device *icd, | |
346 | struct v4l2_chip_ident *id) | |
347 | { | |
348 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
349 | ||
350 | if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR) | |
351 | return -EINVAL; | |
352 | ||
353 | if (id->match_chip != mt9m001->client->addr) | |
354 | return -ENODEV; | |
355 | ||
356 | id->ident = mt9m001->model; | |
357 | id->revision = 0; | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
363 | static int mt9m001_get_register(struct soc_camera_device *icd, | |
364 | struct v4l2_register *reg) | |
365 | { | |
366 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
367 | ||
368 | if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) | |
369 | return -EINVAL; | |
370 | ||
371 | if (reg->match_chip != mt9m001->client->addr) | |
372 | return -ENODEV; | |
373 | ||
374 | reg->val = reg_read(icd, reg->reg); | |
375 | ||
376 | if (reg->val > 0xffff) | |
377 | return -EIO; | |
378 | ||
379 | return 0; | |
380 | } | |
381 | ||
382 | static int mt9m001_set_register(struct soc_camera_device *icd, | |
383 | struct v4l2_register *reg) | |
384 | { | |
385 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
386 | ||
387 | if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) | |
388 | return -EINVAL; | |
389 | ||
390 | if (reg->match_chip != mt9m001->client->addr) | |
391 | return -ENODEV; | |
392 | ||
393 | if (reg_write(icd, reg->reg, reg->val) < 0) | |
394 | return -EIO; | |
395 | ||
396 | return 0; | |
397 | } | |
398 | #endif | |
399 | ||
400 | static const struct v4l2_queryctrl mt9m001_controls[] = { | |
401 | { | |
402 | .id = V4L2_CID_VFLIP, | |
403 | .type = V4L2_CTRL_TYPE_BOOLEAN, | |
404 | .name = "Flip Vertically", | |
405 | .minimum = 0, | |
406 | .maximum = 1, | |
407 | .step = 1, | |
408 | .default_value = 0, | |
409 | }, { | |
410 | .id = V4L2_CID_GAIN, | |
411 | .type = V4L2_CTRL_TYPE_INTEGER, | |
412 | .name = "Gain", | |
413 | .minimum = 0, | |
414 | .maximum = 127, | |
415 | .step = 1, | |
416 | .default_value = 64, | |
417 | .flags = V4L2_CTRL_FLAG_SLIDER, | |
418 | }, { | |
419 | .id = V4L2_CID_EXPOSURE, | |
420 | .type = V4L2_CTRL_TYPE_INTEGER, | |
421 | .name = "Exposure", | |
422 | .minimum = 1, | |
423 | .maximum = 255, | |
424 | .step = 1, | |
425 | .default_value = 255, | |
426 | .flags = V4L2_CTRL_FLAG_SLIDER, | |
427 | }, { | |
428 | .id = V4L2_CID_EXPOSURE_AUTO, | |
429 | .type = V4L2_CTRL_TYPE_BOOLEAN, | |
430 | .name = "Automatic Exposure", | |
431 | .minimum = 0, | |
432 | .maximum = 1, | |
433 | .step = 1, | |
434 | .default_value = 1, | |
435 | } | |
436 | }; | |
437 | ||
438 | static int mt9m001_video_probe(struct soc_camera_device *); | |
439 | static void mt9m001_video_remove(struct soc_camera_device *); | |
440 | static int mt9m001_get_control(struct soc_camera_device *, struct v4l2_control *); | |
441 | static int mt9m001_set_control(struct soc_camera_device *, struct v4l2_control *); | |
442 | ||
443 | static struct soc_camera_ops mt9m001_ops = { | |
444 | .owner = THIS_MODULE, | |
445 | .probe = mt9m001_video_probe, | |
446 | .remove = mt9m001_video_remove, | |
447 | .init = mt9m001_init, | |
448 | .release = mt9m001_release, | |
449 | .start_capture = mt9m001_start_capture, | |
450 | .stop_capture = mt9m001_stop_capture, | |
451 | .set_fmt = mt9m001_set_fmt, | |
452 | .try_fmt = mt9m001_try_fmt, | |
453 | .set_bus_param = mt9m001_set_bus_param, | |
454 | .query_bus_param = mt9m001_query_bus_param, | |
455 | .controls = mt9m001_controls, | |
456 | .num_controls = ARRAY_SIZE(mt9m001_controls), | |
457 | .get_control = mt9m001_get_control, | |
458 | .set_control = mt9m001_set_control, | |
459 | .get_chip_id = mt9m001_get_chip_id, | |
460 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
461 | .get_register = mt9m001_get_register, | |
462 | .set_register = mt9m001_set_register, | |
463 | #endif | |
464 | }; | |
465 | ||
466 | static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl) | |
467 | { | |
468 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
469 | int data; | |
470 | ||
471 | switch (ctrl->id) { | |
472 | case V4L2_CID_VFLIP: | |
473 | data = reg_read(icd, MT9M001_READ_OPTIONS2); | |
474 | if (data < 0) | |
475 | return -EIO; | |
476 | ctrl->value = !!(data & 0x8000); | |
477 | break; | |
478 | case V4L2_CID_EXPOSURE_AUTO: | |
479 | ctrl->value = mt9m001->autoexposure; | |
480 | break; | |
481 | } | |
482 | return 0; | |
483 | } | |
484 | ||
485 | static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl) | |
486 | { | |
487 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
488 | const struct v4l2_queryctrl *qctrl; | |
489 | int data; | |
490 | ||
491 | qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id); | |
492 | ||
493 | if (!qctrl) | |
494 | return -EINVAL; | |
495 | ||
496 | switch (ctrl->id) { | |
497 | case V4L2_CID_VFLIP: | |
498 | if (ctrl->value) | |
499 | data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000); | |
500 | else | |
501 | data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000); | |
502 | if (data < 0) | |
503 | return -EIO; | |
504 | break; | |
505 | case V4L2_CID_GAIN: | |
506 | if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum) | |
507 | return -EINVAL; | |
508 | /* See Datasheet Table 7, Gain settings. */ | |
509 | if (ctrl->value <= qctrl->default_value) { | |
510 | /* Pack it into 0..1 step 0.125, register values 0..8 */ | |
511 | unsigned long range = qctrl->default_value - qctrl->minimum; | |
512 | data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range; | |
513 | ||
514 | dev_dbg(&icd->dev, "Setting gain %d\n", data); | |
515 | data = reg_write(icd, MT9M001_GLOBAL_GAIN, data); | |
516 | if (data < 0) | |
517 | return -EIO; | |
518 | } else { | |
519 | /* Pack it into 1.125..15 variable step, register values 9..67 */ | |
520 | /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */ | |
521 | unsigned long range = qctrl->maximum - qctrl->default_value - 1; | |
522 | unsigned long gain = ((ctrl->value - qctrl->default_value - 1) * | |
523 | 111 + range / 2) / range + 9; | |
524 | ||
525 | if (gain <= 32) | |
526 | data = gain; | |
527 | else if (gain <= 64) | |
528 | data = ((gain - 32) * 16 + 16) / 32 + 80; | |
529 | else | |
530 | data = ((gain - 64) * 7 + 28) / 56 + 96; | |
531 | ||
532 | dev_dbg(&icd->dev, "Setting gain from %d to %d\n", | |
533 | reg_read(icd, MT9M001_GLOBAL_GAIN), data); | |
534 | data = reg_write(icd, MT9M001_GLOBAL_GAIN, data); | |
535 | if (data < 0) | |
536 | return -EIO; | |
537 | } | |
538 | ||
539 | /* Success */ | |
540 | icd->gain = ctrl->value; | |
541 | break; | |
542 | case V4L2_CID_EXPOSURE: | |
543 | /* mt9m001 has maximum == default */ | |
544 | if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum) | |
545 | return -EINVAL; | |
546 | else { | |
547 | unsigned long range = qctrl->maximum - qctrl->minimum; | |
548 | unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 + | |
549 | range / 2) / range + 1; | |
550 | ||
551 | dev_dbg(&icd->dev, "Setting shutter width from %d to %lu\n", | |
552 | reg_read(icd, MT9M001_SHUTTER_WIDTH), shutter); | |
553 | if (reg_write(icd, MT9M001_SHUTTER_WIDTH, shutter) < 0) | |
554 | return -EIO; | |
555 | icd->exposure = ctrl->value; | |
556 | mt9m001->autoexposure = 0; | |
557 | } | |
558 | break; | |
559 | case V4L2_CID_EXPOSURE_AUTO: | |
560 | if (ctrl->value) { | |
561 | const u16 vblank = 25; | |
562 | if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height + | |
563 | icd->y_skip_top + vblank) < 0) | |
564 | return -EIO; | |
565 | qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE); | |
566 | icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) * | |
567 | (qctrl->maximum - qctrl->minimum)) / | |
568 | 1048 + qctrl->minimum; | |
569 | mt9m001->autoexposure = 1; | |
570 | } else | |
571 | mt9m001->autoexposure = 0; | |
572 | break; | |
573 | } | |
574 | return 0; | |
575 | } | |
576 | ||
577 | /* Interface active, can use i2c. If it fails, it can indeed mean, that | |
578 | * this wasn't our capture interface, so, we wait for the right one */ | |
579 | static int mt9m001_video_probe(struct soc_camera_device *icd) | |
580 | { | |
581 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
582 | struct soc_camera_link *icl = mt9m001->client->dev.platform_data; | |
583 | s32 data; | |
584 | int ret; | |
585 | ||
586 | /* We must have a parent by now. And it cannot be a wrong one. | |
587 | * So this entire test is completely redundant. */ | |
588 | if (!icd->dev.parent || | |
589 | to_soc_camera_host(icd->dev.parent)->nr != icd->iface) | |
590 | return -ENODEV; | |
591 | ||
592 | /* Enable the chip */ | |
593 | data = reg_write(&mt9m001->icd, MT9M001_CHIP_ENABLE, 1); | |
594 | dev_dbg(&icd->dev, "write: %d\n", data); | |
595 | ||
596 | /* Read out the chip version register */ | |
597 | data = reg_read(icd, MT9M001_CHIP_VERSION); | |
598 | ||
599 | /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */ | |
600 | switch (data) { | |
601 | case 0x8411: | |
602 | case 0x8421: | |
603 | mt9m001->model = V4L2_IDENT_MT9M001C12ST; | |
604 | icd->formats = mt9m001_colour_formats; | |
605 | if (gpio_is_valid(icl->gpio)) | |
606 | icd->num_formats = ARRAY_SIZE(mt9m001_colour_formats); | |
607 | else | |
608 | icd->num_formats = 1; | |
609 | break; | |
610 | case 0x8431: | |
611 | mt9m001->model = V4L2_IDENT_MT9M001C12STM; | |
612 | icd->formats = mt9m001_monochrome_formats; | |
613 | if (gpio_is_valid(icl->gpio)) | |
614 | icd->num_formats = ARRAY_SIZE(mt9m001_monochrome_formats); | |
615 | else | |
616 | icd->num_formats = 1; | |
617 | break; | |
618 | default: | |
619 | ret = -ENODEV; | |
620 | dev_err(&icd->dev, | |
621 | "No MT9M001 chip detected, register read %x\n", data); | |
622 | goto ei2c; | |
623 | } | |
624 | ||
625 | dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data, | |
626 | data == 0x8431 ? "C12STM" : "C12ST"); | |
627 | ||
628 | /* Now that we know the model, we can start video */ | |
629 | ret = soc_camera_video_start(icd); | |
630 | if (ret) | |
631 | goto eisis; | |
632 | ||
633 | return 0; | |
634 | ||
635 | eisis: | |
636 | ei2c: | |
637 | return ret; | |
638 | } | |
639 | ||
640 | static void mt9m001_video_remove(struct soc_camera_device *icd) | |
641 | { | |
642 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
643 | ||
644 | dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr, | |
645 | mt9m001->icd.dev.parent, mt9m001->icd.vdev); | |
646 | soc_camera_video_stop(&mt9m001->icd); | |
647 | } | |
648 | ||
649 | static int mt9m001_probe(struct i2c_client *client, | |
650 | const struct i2c_device_id *did) | |
651 | { | |
652 | struct mt9m001 *mt9m001; | |
653 | struct soc_camera_device *icd; | |
654 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
655 | struct soc_camera_link *icl = client->dev.platform_data; | |
656 | int ret; | |
657 | ||
658 | if (!icl) { | |
659 | dev_err(&client->dev, "MT9M001 driver needs platform data\n"); | |
660 | return -EINVAL; | |
661 | } | |
662 | ||
663 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) { | |
664 | dev_warn(&adapter->dev, | |
665 | "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); | |
666 | return -EIO; | |
667 | } | |
668 | ||
669 | mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL); | |
670 | if (!mt9m001) | |
671 | return -ENOMEM; | |
672 | ||
673 | mt9m001->client = client; | |
674 | i2c_set_clientdata(client, mt9m001); | |
675 | ||
676 | /* Second stage probe - when a capture adapter is there */ | |
677 | icd = &mt9m001->icd; | |
678 | icd->ops = &mt9m001_ops; | |
679 | icd->control = &client->dev; | |
680 | icd->x_min = 20; | |
681 | icd->y_min = 12; | |
682 | icd->x_current = 20; | |
683 | icd->y_current = 12; | |
684 | icd->width_min = 48; | |
685 | icd->width_max = 1280; | |
686 | icd->height_min = 32; | |
687 | icd->height_max = 1024; | |
688 | icd->y_skip_top = 1; | |
689 | icd->iface = icl->bus_id; | |
690 | /* Default datawidth - this is the only width this camera (normally) | |
691 | * supports. It is only with extra logic that it can support | |
692 | * other widths. Therefore it seems to be a sensible default. */ | |
693 | mt9m001->datawidth = 10; | |
694 | /* Simulated autoexposure. If enabled, we calculate shutter width | |
695 | * ourselves in the driver based on vertical blanking and frame width */ | |
696 | mt9m001->autoexposure = 1; | |
697 | ||
698 | ret = bus_switch_request(mt9m001, icl); | |
699 | if (ret) | |
700 | goto eswinit; | |
701 | ||
702 | ret = soc_camera_device_register(icd); | |
703 | if (ret) | |
704 | goto eisdr; | |
705 | ||
706 | return 0; | |
707 | ||
708 | eisdr: | |
709 | bus_switch_release(mt9m001); | |
710 | eswinit: | |
711 | kfree(mt9m001); | |
712 | return ret; | |
713 | } | |
714 | ||
715 | static int mt9m001_remove(struct i2c_client *client) | |
716 | { | |
717 | struct mt9m001 *mt9m001 = i2c_get_clientdata(client); | |
718 | ||
719 | soc_camera_device_unregister(&mt9m001->icd); | |
720 | bus_switch_release(mt9m001); | |
721 | kfree(mt9m001); | |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
726 | static const struct i2c_device_id mt9m001_id[] = { | |
727 | { "mt9m001", 0 }, | |
728 | { } | |
729 | }; | |
730 | MODULE_DEVICE_TABLE(i2c, mt9m001_id); | |
731 | ||
732 | static struct i2c_driver mt9m001_i2c_driver = { | |
733 | .driver = { | |
734 | .name = "mt9m001", | |
735 | }, | |
736 | .probe = mt9m001_probe, | |
737 | .remove = mt9m001_remove, | |
738 | .id_table = mt9m001_id, | |
739 | }; | |
740 | ||
741 | static int __init mt9m001_mod_init(void) | |
742 | { | |
743 | return i2c_add_driver(&mt9m001_i2c_driver); | |
744 | } | |
745 | ||
746 | static void __exit mt9m001_mod_exit(void) | |
747 | { | |
748 | i2c_del_driver(&mt9m001_i2c_driver); | |
749 | } | |
750 | ||
751 | module_init(mt9m001_mod_init); | |
752 | module_exit(mt9m001_mod_exit); | |
753 | ||
754 | MODULE_DESCRIPTION("Micron MT9M001 Camera driver"); | |
755 | MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>"); | |
756 | MODULE_LICENSE("GPL"); |