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f523dd0d GL |
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> | |
91e64c88 | 15 | #include <linux/gpio.h> |
f523dd0d GL |
16 | |
17 | #include <media/v4l2-common.h> | |
18 | #include <media/v4l2-chip-ident.h> | |
19 | #include <media/soc_camera.h> | |
20 | ||
f523dd0d GL |
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[] = { | |
bb55de3b GL |
44 | /* Order important: first natively supported, |
45 | * second supported with a GPIO extender */ | |
f523dd0d | 46 | { |
bb55de3b GL |
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, | |
f523dd0d GL |
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[] = { | |
bb55de3b | 60 | /* Order important - see above */ |
f523dd0d GL |
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 | { | |
81034663 SH |
120 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); |
121 | struct soc_camera_link *icl = mt9m001->client->dev.platform_data; | |
f523dd0d GL |
122 | int ret; |
123 | ||
5e85e732 | 124 | dev_dbg(icd->vdev->parent, "%s\n", __func__); |
f523dd0d | 125 | |
81034663 SH |
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 | } | |
11211641 GL |
147 | /* Disable chip, synchronous option update */ |
148 | if (!ret) | |
f523dd0d GL |
149 | ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0); |
150 | ||
11211641 | 151 | return ret; |
f523dd0d GL |
152 | } |
153 | ||
154 | static int mt9m001_release(struct soc_camera_device *icd) | |
155 | { | |
81034663 SH |
156 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); |
157 | struct soc_camera_link *icl = mt9m001->client->dev.platform_data; | |
158 | ||
f523dd0d GL |
159 | /* Disable the chip */ |
160 | reg_write(icd, MT9M001_OUTPUT_CONTROL, 0); | |
81034663 SH |
161 | |
162 | if (icl->power) | |
163 | icl->power(&mt9m001->client->dev, 0); | |
164 | ||
f523dd0d GL |
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 | ||
b4333a3b | 191 | if (gpio_is_valid(gpio)) { |
f523dd0d GL |
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 | |
b4333a3b | 211 | mt9m001->switch_gpio = -EINVAL; |
f523dd0d GL |
212 | #endif |
213 | return 0; | |
214 | } | |
215 | ||
216 | static void bus_switch_release(struct mt9m001 *mt9m001) | |
217 | { | |
218 | #ifdef CONFIG_MT9M001_PCA9536_SWITCH | |
b4333a3b | 219 | if (gpio_is_valid(mt9m001->switch_gpio)) |
f523dd0d GL |
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 | |
b4333a3b | 227 | if (!gpio_is_valid(mt9m001->switch_gpio)) |
f523dd0d GL |
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 | ||
ad5f2e85 GL |
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) | |
f523dd0d GL |
248 | { |
249 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
ad5f2e85 | 250 | unsigned int width_flag = flags & SOCAM_DATAWIDTH_MASK; |
f523dd0d | 251 | int ret; |
f523dd0d | 252 | |
ad5f2e85 | 253 | /* Flags validity verified in test_bus_param */ |
f523dd0d | 254 | |
ad5f2e85 GL |
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))) { | |
f523dd0d | 258 | /* Well, we actually only can do 10 or 8 bits... */ |
ad5f2e85 | 259 | if (width_flag == SOCAM_DATAWIDTH_9) |
f523dd0d GL |
260 | return -EINVAL; |
261 | ret = bus_switch_act(mt9m001, | |
ad5f2e85 | 262 | width_flag == SOCAM_DATAWIDTH_8); |
f523dd0d GL |
263 | if (ret < 0) |
264 | return ret; | |
265 | ||
ad5f2e85 | 266 | mt9m001->datawidth = width_flag == SOCAM_DATAWIDTH_8 ? 8 : 10; |
f523dd0d GL |
267 | } |
268 | ||
ad5f2e85 GL |
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 | unsigned int width_flag = SOCAM_DATAWIDTH_10; | |
276 | ||
277 | if (bus_switch_possible(mt9m001)) | |
278 | width_flag |= SOCAM_DATAWIDTH_8; | |
279 | ||
280 | /* MT9M001 has all capture_format parameters fixed */ | |
281 | return SOCAM_PCLK_SAMPLE_RISING | | |
282 | SOCAM_HSYNC_ACTIVE_HIGH | | |
283 | SOCAM_VSYNC_ACTIVE_HIGH | | |
284 | SOCAM_MASTER | | |
285 | width_flag; | |
286 | } | |
287 | ||
d8fac217 GL |
288 | static int mt9m001_set_fmt(struct soc_camera_device *icd, |
289 | __u32 pixfmt, struct v4l2_rect *rect) | |
ad5f2e85 GL |
290 | { |
291 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
292 | int ret; | |
293 | const u16 hblank = 9, vblank = 25; | |
294 | ||
f523dd0d GL |
295 | /* Blanking and start values - default... */ |
296 | ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank); | |
11211641 | 297 | if (!ret) |
f523dd0d GL |
298 | ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank); |
299 | ||
300 | /* The caller provides a supported format, as verified per | |
d8fac217 | 301 | * call to icd->try_fmt() */ |
11211641 | 302 | if (!ret) |
f523dd0d | 303 | ret = reg_write(icd, MT9M001_COLUMN_START, rect->left); |
11211641 | 304 | if (!ret) |
f523dd0d | 305 | ret = reg_write(icd, MT9M001_ROW_START, rect->top); |
11211641 | 306 | if (!ret) |
f523dd0d | 307 | ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1); |
11211641 | 308 | if (!ret) |
f523dd0d GL |
309 | ret = reg_write(icd, MT9M001_WINDOW_HEIGHT, |
310 | rect->height + icd->y_skip_top - 1); | |
11211641 | 311 | if (!ret && mt9m001->autoexposure) { |
f523dd0d GL |
312 | ret = reg_write(icd, MT9M001_SHUTTER_WIDTH, |
313 | rect->height + icd->y_skip_top + vblank); | |
11211641 | 314 | if (!ret) { |
f523dd0d GL |
315 | const struct v4l2_queryctrl *qctrl = |
316 | soc_camera_find_qctrl(icd->ops, | |
317 | V4L2_CID_EXPOSURE); | |
318 | icd->exposure = (524 + (rect->height + icd->y_skip_top + | |
319 | vblank - 1) * | |
320 | (qctrl->maximum - qctrl->minimum)) / | |
321 | 1048 + qctrl->minimum; | |
322 | } | |
323 | } | |
324 | ||
11211641 | 325 | return ret; |
f523dd0d GL |
326 | } |
327 | ||
d8fac217 GL |
328 | static int mt9m001_try_fmt(struct soc_camera_device *icd, |
329 | struct v4l2_format *f) | |
f523dd0d GL |
330 | { |
331 | if (f->fmt.pix.height < 32 + icd->y_skip_top) | |
332 | f->fmt.pix.height = 32 + icd->y_skip_top; | |
333 | if (f->fmt.pix.height > 1024 + icd->y_skip_top) | |
334 | f->fmt.pix.height = 1024 + icd->y_skip_top; | |
335 | if (f->fmt.pix.width < 48) | |
336 | f->fmt.pix.width = 48; | |
337 | if (f->fmt.pix.width > 1280) | |
338 | f->fmt.pix.width = 1280; | |
339 | f->fmt.pix.width &= ~0x01; /* has to be even, unsure why was ~3 */ | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | static int mt9m001_get_chip_id(struct soc_camera_device *icd, | |
345 | struct v4l2_chip_ident *id) | |
346 | { | |
347 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
348 | ||
349 | if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR) | |
350 | return -EINVAL; | |
351 | ||
352 | if (id->match_chip != mt9m001->client->addr) | |
353 | return -ENODEV; | |
354 | ||
355 | id->ident = mt9m001->model; | |
356 | id->revision = 0; | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
362 | static int mt9m001_get_register(struct soc_camera_device *icd, | |
363 | struct v4l2_register *reg) | |
364 | { | |
365 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
366 | ||
367 | if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) | |
368 | return -EINVAL; | |
369 | ||
370 | if (reg->match_chip != mt9m001->client->addr) | |
371 | return -ENODEV; | |
372 | ||
373 | reg->val = reg_read(icd, reg->reg); | |
374 | ||
375 | if (reg->val > 0xffff) | |
376 | return -EIO; | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
381 | static int mt9m001_set_register(struct soc_camera_device *icd, | |
382 | struct v4l2_register *reg) | |
383 | { | |
384 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
385 | ||
386 | if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) | |
387 | return -EINVAL; | |
388 | ||
389 | if (reg->match_chip != mt9m001->client->addr) | |
390 | return -ENODEV; | |
391 | ||
392 | if (reg_write(icd, reg->reg, reg->val) < 0) | |
393 | return -EIO; | |
394 | ||
395 | return 0; | |
396 | } | |
397 | #endif | |
398 | ||
4407a463 | 399 | static const struct v4l2_queryctrl mt9m001_controls[] = { |
f523dd0d GL |
400 | { |
401 | .id = V4L2_CID_VFLIP, | |
402 | .type = V4L2_CTRL_TYPE_BOOLEAN, | |
403 | .name = "Flip Vertically", | |
404 | .minimum = 0, | |
405 | .maximum = 1, | |
406 | .step = 1, | |
407 | .default_value = 0, | |
408 | }, { | |
409 | .id = V4L2_CID_GAIN, | |
410 | .type = V4L2_CTRL_TYPE_INTEGER, | |
411 | .name = "Gain", | |
412 | .minimum = 0, | |
413 | .maximum = 127, | |
414 | .step = 1, | |
415 | .default_value = 64, | |
416 | .flags = V4L2_CTRL_FLAG_SLIDER, | |
417 | }, { | |
418 | .id = V4L2_CID_EXPOSURE, | |
419 | .type = V4L2_CTRL_TYPE_INTEGER, | |
420 | .name = "Exposure", | |
421 | .minimum = 1, | |
422 | .maximum = 255, | |
423 | .step = 1, | |
424 | .default_value = 255, | |
425 | .flags = V4L2_CTRL_FLAG_SLIDER, | |
426 | }, { | |
427 | .id = V4L2_CID_EXPOSURE_AUTO, | |
428 | .type = V4L2_CTRL_TYPE_BOOLEAN, | |
429 | .name = "Automatic Exposure", | |
430 | .minimum = 0, | |
431 | .maximum = 1, | |
432 | .step = 1, | |
433 | .default_value = 1, | |
434 | } | |
435 | }; | |
436 | ||
26f1b942 GL |
437 | static int mt9m001_video_probe(struct soc_camera_device *); |
438 | static void mt9m001_video_remove(struct soc_camera_device *); | |
439 | static int mt9m001_get_control(struct soc_camera_device *, struct v4l2_control *); | |
440 | static int mt9m001_set_control(struct soc_camera_device *, struct v4l2_control *); | |
f523dd0d GL |
441 | |
442 | static struct soc_camera_ops mt9m001_ops = { | |
443 | .owner = THIS_MODULE, | |
26f1b942 GL |
444 | .probe = mt9m001_video_probe, |
445 | .remove = mt9m001_video_remove, | |
f523dd0d GL |
446 | .init = mt9m001_init, |
447 | .release = mt9m001_release, | |
448 | .start_capture = mt9m001_start_capture, | |
449 | .stop_capture = mt9m001_stop_capture, | |
d8fac217 GL |
450 | .set_fmt = mt9m001_set_fmt, |
451 | .try_fmt = mt9m001_try_fmt, | |
ad5f2e85 GL |
452 | .set_bus_param = mt9m001_set_bus_param, |
453 | .query_bus_param = mt9m001_query_bus_param, | |
f523dd0d GL |
454 | .controls = mt9m001_controls, |
455 | .num_controls = ARRAY_SIZE(mt9m001_controls), | |
456 | .get_control = mt9m001_get_control, | |
457 | .set_control = mt9m001_set_control, | |
458 | .get_chip_id = mt9m001_get_chip_id, | |
459 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
460 | .get_register = mt9m001_get_register, | |
461 | .set_register = mt9m001_set_register, | |
462 | #endif | |
463 | }; | |
464 | ||
465 | static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl) | |
466 | { | |
467 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
468 | int data; | |
469 | ||
470 | switch (ctrl->id) { | |
471 | case V4L2_CID_VFLIP: | |
472 | data = reg_read(icd, MT9M001_READ_OPTIONS2); | |
473 | if (data < 0) | |
474 | return -EIO; | |
475 | ctrl->value = !!(data & 0x8000); | |
476 | break; | |
477 | case V4L2_CID_EXPOSURE_AUTO: | |
478 | ctrl->value = mt9m001->autoexposure; | |
479 | break; | |
480 | } | |
481 | return 0; | |
482 | } | |
483 | ||
484 | static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl) | |
485 | { | |
486 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
487 | const struct v4l2_queryctrl *qctrl; | |
488 | int data; | |
489 | ||
490 | qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id); | |
491 | ||
492 | if (!qctrl) | |
493 | return -EINVAL; | |
494 | ||
495 | switch (ctrl->id) { | |
496 | case V4L2_CID_VFLIP: | |
497 | if (ctrl->value) | |
498 | data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000); | |
499 | else | |
500 | data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000); | |
501 | if (data < 0) | |
502 | return -EIO; | |
503 | break; | |
504 | case V4L2_CID_GAIN: | |
505 | if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum) | |
506 | return -EINVAL; | |
507 | /* See Datasheet Table 7, Gain settings. */ | |
508 | if (ctrl->value <= qctrl->default_value) { | |
509 | /* Pack it into 0..1 step 0.125, register values 0..8 */ | |
510 | unsigned long range = qctrl->default_value - qctrl->minimum; | |
511 | data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range; | |
512 | ||
513 | dev_dbg(&icd->dev, "Setting gain %d\n", data); | |
514 | data = reg_write(icd, MT9M001_GLOBAL_GAIN, data); | |
515 | if (data < 0) | |
516 | return -EIO; | |
517 | } else { | |
518 | /* Pack it into 1.125..15 variable step, register values 9..67 */ | |
519 | /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */ | |
520 | unsigned long range = qctrl->maximum - qctrl->default_value - 1; | |
521 | unsigned long gain = ((ctrl->value - qctrl->default_value - 1) * | |
522 | 111 + range / 2) / range + 9; | |
523 | ||
524 | if (gain <= 32) | |
525 | data = gain; | |
526 | else if (gain <= 64) | |
527 | data = ((gain - 32) * 16 + 16) / 32 + 80; | |
528 | else | |
529 | data = ((gain - 64) * 7 + 28) / 56 + 96; | |
530 | ||
531 | dev_dbg(&icd->dev, "Setting gain from %d to %d\n", | |
532 | reg_read(icd, MT9M001_GLOBAL_GAIN), data); | |
533 | data = reg_write(icd, MT9M001_GLOBAL_GAIN, data); | |
534 | if (data < 0) | |
535 | return -EIO; | |
536 | } | |
537 | ||
538 | /* Success */ | |
539 | icd->gain = ctrl->value; | |
540 | break; | |
541 | case V4L2_CID_EXPOSURE: | |
542 | /* mt9m001 has maximum == default */ | |
543 | if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum) | |
544 | return -EINVAL; | |
545 | else { | |
546 | unsigned long range = qctrl->maximum - qctrl->minimum; | |
547 | unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 + | |
548 | range / 2) / range + 1; | |
549 | ||
550 | dev_dbg(&icd->dev, "Setting shutter width from %d to %lu\n", | |
551 | reg_read(icd, MT9M001_SHUTTER_WIDTH), shutter); | |
552 | if (reg_write(icd, MT9M001_SHUTTER_WIDTH, shutter) < 0) | |
553 | return -EIO; | |
554 | icd->exposure = ctrl->value; | |
555 | mt9m001->autoexposure = 0; | |
556 | } | |
557 | break; | |
558 | case V4L2_CID_EXPOSURE_AUTO: | |
559 | if (ctrl->value) { | |
560 | const u16 vblank = 25; | |
561 | if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height + | |
562 | icd->y_skip_top + vblank) < 0) | |
563 | return -EIO; | |
564 | qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE); | |
565 | icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) * | |
566 | (qctrl->maximum - qctrl->minimum)) / | |
567 | 1048 + qctrl->minimum; | |
568 | mt9m001->autoexposure = 1; | |
569 | } else | |
570 | mt9m001->autoexposure = 0; | |
571 | break; | |
572 | } | |
573 | return 0; | |
574 | } | |
575 | ||
576 | /* Interface active, can use i2c. If it fails, it can indeed mean, that | |
577 | * this wasn't our capture interface, so, we wait for the right one */ | |
578 | static int mt9m001_video_probe(struct soc_camera_device *icd) | |
579 | { | |
580 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
297a7ef7 | 581 | struct soc_camera_link *icl = mt9m001->client->dev.platform_data; |
f523dd0d GL |
582 | s32 data; |
583 | int ret; | |
584 | ||
585 | /* We must have a parent by now. And it cannot be a wrong one. | |
586 | * So this entire test is completely redundant. */ | |
587 | if (!icd->dev.parent || | |
588 | to_soc_camera_host(icd->dev.parent)->nr != icd->iface) | |
589 | return -ENODEV; | |
590 | ||
591 | /* Enable the chip */ | |
592 | data = reg_write(&mt9m001->icd, MT9M001_CHIP_ENABLE, 1); | |
593 | dev_dbg(&icd->dev, "write: %d\n", data); | |
594 | ||
595 | /* Read out the chip version register */ | |
596 | data = reg_read(icd, MT9M001_CHIP_VERSION); | |
597 | ||
598 | /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */ | |
599 | switch (data) { | |
600 | case 0x8411: | |
601 | case 0x8421: | |
602 | mt9m001->model = V4L2_IDENT_MT9M001C12ST; | |
26f1b942 | 603 | icd->formats = mt9m001_colour_formats; |
297a7ef7 | 604 | if (gpio_is_valid(icl->gpio)) |
26f1b942 | 605 | icd->num_formats = ARRAY_SIZE(mt9m001_colour_formats); |
bb55de3b | 606 | else |
26f1b942 | 607 | icd->num_formats = 1; |
f523dd0d GL |
608 | break; |
609 | case 0x8431: | |
610 | mt9m001->model = V4L2_IDENT_MT9M001C12STM; | |
26f1b942 | 611 | icd->formats = mt9m001_monochrome_formats; |
297a7ef7 | 612 | if (gpio_is_valid(icl->gpio)) |
26f1b942 | 613 | icd->num_formats = ARRAY_SIZE(mt9m001_monochrome_formats); |
f523dd0d | 614 | else |
26f1b942 | 615 | icd->num_formats = 1; |
f523dd0d GL |
616 | break; |
617 | default: | |
618 | ret = -ENODEV; | |
619 | dev_err(&icd->dev, | |
620 | "No MT9M001 chip detected, register read %x\n", data); | |
621 | goto ei2c; | |
622 | } | |
623 | ||
624 | dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data, | |
625 | data == 0x8431 ? "C12STM" : "C12ST"); | |
626 | ||
627 | /* Now that we know the model, we can start video */ | |
628 | ret = soc_camera_video_start(icd); | |
629 | if (ret) | |
630 | goto eisis; | |
631 | ||
632 | return 0; | |
633 | ||
634 | eisis: | |
635 | ei2c: | |
636 | return ret; | |
637 | } | |
638 | ||
639 | static void mt9m001_video_remove(struct soc_camera_device *icd) | |
640 | { | |
641 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
642 | ||
643 | dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr, | |
644 | mt9m001->icd.dev.parent, mt9m001->icd.vdev); | |
645 | soc_camera_video_stop(&mt9m001->icd); | |
646 | } | |
647 | ||
d2653e92 JD |
648 | static int mt9m001_probe(struct i2c_client *client, |
649 | const struct i2c_device_id *did) | |
f523dd0d GL |
650 | { |
651 | struct mt9m001 *mt9m001; | |
652 | struct soc_camera_device *icd; | |
653 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
654 | struct soc_camera_link *icl = client->dev.platform_data; | |
655 | int ret; | |
656 | ||
657 | if (!icl) { | |
658 | dev_err(&client->dev, "MT9M001 driver needs platform data\n"); | |
659 | return -EINVAL; | |
660 | } | |
661 | ||
662 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) { | |
663 | dev_warn(&adapter->dev, | |
664 | "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); | |
665 | return -EIO; | |
666 | } | |
667 | ||
668 | mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL); | |
669 | if (!mt9m001) | |
670 | return -ENOMEM; | |
671 | ||
672 | mt9m001->client = client; | |
673 | i2c_set_clientdata(client, mt9m001); | |
674 | ||
675 | /* Second stage probe - when a capture adapter is there */ | |
676 | icd = &mt9m001->icd; | |
f523dd0d GL |
677 | icd->ops = &mt9m001_ops; |
678 | icd->control = &client->dev; | |
679 | icd->x_min = 20; | |
680 | icd->y_min = 12; | |
681 | icd->x_current = 20; | |
682 | icd->y_current = 12; | |
683 | icd->width_min = 48; | |
684 | icd->width_max = 1280; | |
685 | icd->height_min = 32; | |
686 | icd->height_max = 1024; | |
687 | icd->y_skip_top = 1; | |
688 | icd->iface = icl->bus_id; | |
689 | /* Default datawidth - this is the only width this camera (normally) | |
690 | * supports. It is only with extra logic that it can support | |
691 | * other widths. Therefore it seems to be a sensible default. */ | |
692 | mt9m001->datawidth = 10; | |
693 | /* Simulated autoexposure. If enabled, we calculate shutter width | |
694 | * ourselves in the driver based on vertical blanking and frame width */ | |
695 | mt9m001->autoexposure = 1; | |
696 | ||
697 | ret = bus_switch_request(mt9m001, icl); | |
698 | if (ret) | |
699 | goto eswinit; | |
700 | ||
701 | ret = soc_camera_device_register(icd); | |
702 | if (ret) | |
703 | goto eisdr; | |
704 | ||
705 | return 0; | |
706 | ||
707 | eisdr: | |
708 | bus_switch_release(mt9m001); | |
709 | eswinit: | |
710 | kfree(mt9m001); | |
711 | return ret; | |
712 | } | |
713 | ||
714 | static int mt9m001_remove(struct i2c_client *client) | |
715 | { | |
716 | struct mt9m001 *mt9m001 = i2c_get_clientdata(client); | |
717 | ||
718 | soc_camera_device_unregister(&mt9m001->icd); | |
719 | bus_switch_release(mt9m001); | |
720 | kfree(mt9m001); | |
721 | ||
722 | return 0; | |
723 | } | |
724 | ||
3760f736 JD |
725 | static const struct i2c_device_id mt9m001_id[] = { |
726 | { "mt9m001", 0 }, | |
727 | { } | |
728 | }; | |
729 | MODULE_DEVICE_TABLE(i2c, mt9m001_id); | |
730 | ||
f523dd0d GL |
731 | static struct i2c_driver mt9m001_i2c_driver = { |
732 | .driver = { | |
733 | .name = "mt9m001", | |
734 | }, | |
735 | .probe = mt9m001_probe, | |
736 | .remove = mt9m001_remove, | |
3760f736 | 737 | .id_table = mt9m001_id, |
f523dd0d GL |
738 | }; |
739 | ||
740 | static int __init mt9m001_mod_init(void) | |
741 | { | |
742 | return i2c_add_driver(&mt9m001_i2c_driver); | |
743 | } | |
744 | ||
745 | static void __exit mt9m001_mod_exit(void) | |
746 | { | |
747 | i2c_del_driver(&mt9m001_i2c_driver); | |
748 | } | |
749 | ||
750 | module_init(mt9m001_mod_init); | |
751 | module_exit(mt9m001_mod_exit); | |
752 | ||
753 | MODULE_DESCRIPTION("Micron MT9M001 Camera driver"); | |
754 | MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>"); | |
755 | MODULE_LICENSE("GPL"); |