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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> | |
15 | ||
16 | #include <media/v4l2-common.h> | |
17 | #include <media/v4l2-chip-ident.h> | |
18 | #include <media/soc_camera.h> | |
19 | ||
ef6ad5c3 | 20 | #ifdef CONFIG_MT9M001_PCA9536_SWITCH |
f523dd0d | 21 | #include <asm/gpio.h> |
ef6ad5c3 | 22 | #endif |
f523dd0d GL |
23 | |
24 | /* mt9m001 i2c address 0x5d | |
25 | * The platform has to define i2c_board_info | |
26 | * and call i2c_register_board_info() */ | |
27 | ||
28 | /* mt9m001 selected register addresses */ | |
29 | #define MT9M001_CHIP_VERSION 0x00 | |
30 | #define MT9M001_ROW_START 0x01 | |
31 | #define MT9M001_COLUMN_START 0x02 | |
32 | #define MT9M001_WINDOW_HEIGHT 0x03 | |
33 | #define MT9M001_WINDOW_WIDTH 0x04 | |
34 | #define MT9M001_HORIZONTAL_BLANKING 0x05 | |
35 | #define MT9M001_VERTICAL_BLANKING 0x06 | |
36 | #define MT9M001_OUTPUT_CONTROL 0x07 | |
37 | #define MT9M001_SHUTTER_WIDTH 0x09 | |
38 | #define MT9M001_FRAME_RESTART 0x0b | |
39 | #define MT9M001_SHUTTER_DELAY 0x0c | |
40 | #define MT9M001_RESET 0x0d | |
41 | #define MT9M001_READ_OPTIONS1 0x1e | |
42 | #define MT9M001_READ_OPTIONS2 0x20 | |
43 | #define MT9M001_GLOBAL_GAIN 0x35 | |
44 | #define MT9M001_CHIP_ENABLE 0xF1 | |
45 | ||
46 | static const struct soc_camera_data_format mt9m001_colour_formats[] = { | |
bb55de3b GL |
47 | /* Order important: first natively supported, |
48 | * second supported with a GPIO extender */ | |
f523dd0d | 49 | { |
bb55de3b GL |
50 | .name = "Bayer (sRGB) 10 bit", |
51 | .depth = 10, | |
52 | .fourcc = V4L2_PIX_FMT_SBGGR16, | |
53 | .colorspace = V4L2_COLORSPACE_SRGB, | |
54 | }, { | |
55 | .name = "Bayer (sRGB) 8 bit", | |
56 | .depth = 8, | |
f523dd0d GL |
57 | .fourcc = V4L2_PIX_FMT_SBGGR8, |
58 | .colorspace = V4L2_COLORSPACE_SRGB, | |
59 | } | |
60 | }; | |
61 | ||
62 | static const struct soc_camera_data_format mt9m001_monochrome_formats[] = { | |
bb55de3b | 63 | /* Order important - see above */ |
f523dd0d GL |
64 | { |
65 | .name = "Monochrome 10 bit", | |
66 | .depth = 10, | |
67 | .fourcc = V4L2_PIX_FMT_Y16, | |
68 | }, { | |
69 | .name = "Monochrome 8 bit", | |
70 | .depth = 8, | |
71 | .fourcc = V4L2_PIX_FMT_GREY, | |
72 | }, | |
73 | }; | |
74 | ||
75 | struct mt9m001 { | |
76 | struct i2c_client *client; | |
77 | struct soc_camera_device icd; | |
78 | int model; /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */ | |
79 | int switch_gpio; | |
80 | unsigned char autoexposure; | |
81 | unsigned char datawidth; | |
82 | }; | |
83 | ||
84 | static int reg_read(struct soc_camera_device *icd, const u8 reg) | |
85 | { | |
86 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
87 | struct i2c_client *client = mt9m001->client; | |
88 | s32 data = i2c_smbus_read_word_data(client, reg); | |
89 | return data < 0 ? data : swab16(data); | |
90 | } | |
91 | ||
92 | static int reg_write(struct soc_camera_device *icd, const u8 reg, | |
93 | const u16 data) | |
94 | { | |
95 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
96 | return i2c_smbus_write_word_data(mt9m001->client, reg, swab16(data)); | |
97 | } | |
98 | ||
99 | static int reg_set(struct soc_camera_device *icd, const u8 reg, | |
100 | const u16 data) | |
101 | { | |
102 | int ret; | |
103 | ||
104 | ret = reg_read(icd, reg); | |
105 | if (ret < 0) | |
106 | return ret; | |
107 | return reg_write(icd, reg, ret | data); | |
108 | } | |
109 | ||
110 | static int reg_clear(struct soc_camera_device *icd, const u8 reg, | |
111 | const u16 data) | |
112 | { | |
113 | int ret; | |
114 | ||
115 | ret = reg_read(icd, reg); | |
116 | if (ret < 0) | |
117 | return ret; | |
118 | return reg_write(icd, reg, ret & ~data); | |
119 | } | |
120 | ||
121 | static int mt9m001_init(struct soc_camera_device *icd) | |
122 | { | |
123 | int ret; | |
124 | ||
125 | /* Disable chip, synchronous option update */ | |
126 | dev_dbg(icd->vdev->dev, "%s\n", __FUNCTION__); | |
127 | ||
128 | ret = reg_write(icd, MT9M001_RESET, 1); | |
129 | if (ret >= 0) | |
130 | ret = reg_write(icd, MT9M001_RESET, 0); | |
131 | if (ret >= 0) | |
132 | ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0); | |
133 | ||
134 | return ret >= 0 ? 0 : -EIO; | |
135 | } | |
136 | ||
137 | static int mt9m001_release(struct soc_camera_device *icd) | |
138 | { | |
139 | /* Disable the chip */ | |
140 | reg_write(icd, MT9M001_OUTPUT_CONTROL, 0); | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static int mt9m001_start_capture(struct soc_camera_device *icd) | |
145 | { | |
146 | /* Switch to master "normal" mode */ | |
147 | if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0) | |
148 | return -EIO; | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static int mt9m001_stop_capture(struct soc_camera_device *icd) | |
153 | { | |
154 | /* Stop sensor readout */ | |
155 | if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0) | |
156 | return -EIO; | |
157 | return 0; | |
158 | } | |
159 | ||
160 | static int bus_switch_request(struct mt9m001 *mt9m001, | |
161 | struct soc_camera_link *icl) | |
162 | { | |
163 | #ifdef CONFIG_MT9M001_PCA9536_SWITCH | |
164 | int ret; | |
165 | unsigned int gpio = icl->gpio; | |
166 | ||
b4333a3b | 167 | if (gpio_is_valid(gpio)) { |
f523dd0d GL |
168 | /* We have a data bus switch. */ |
169 | ret = gpio_request(gpio, "mt9m001"); | |
170 | if (ret < 0) { | |
171 | dev_err(&mt9m001->client->dev, "Cannot get GPIO %u\n", | |
172 | gpio); | |
173 | return ret; | |
174 | } | |
175 | ||
176 | ret = gpio_direction_output(gpio, 0); | |
177 | if (ret < 0) { | |
178 | dev_err(&mt9m001->client->dev, | |
179 | "Cannot set GPIO %u to output\n", gpio); | |
180 | gpio_free(gpio); | |
181 | return ret; | |
182 | } | |
183 | } | |
184 | ||
185 | mt9m001->switch_gpio = gpio; | |
186 | #else | |
b4333a3b | 187 | mt9m001->switch_gpio = -EINVAL; |
f523dd0d GL |
188 | #endif |
189 | return 0; | |
190 | } | |
191 | ||
192 | static void bus_switch_release(struct mt9m001 *mt9m001) | |
193 | { | |
194 | #ifdef CONFIG_MT9M001_PCA9536_SWITCH | |
b4333a3b | 195 | if (gpio_is_valid(mt9m001->switch_gpio)) |
f523dd0d GL |
196 | gpio_free(mt9m001->switch_gpio); |
197 | #endif | |
198 | } | |
199 | ||
200 | static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit) | |
201 | { | |
202 | #ifdef CONFIG_MT9M001_PCA9536_SWITCH | |
b4333a3b | 203 | if (!gpio_is_valid(mt9m001->switch_gpio)) |
f523dd0d GL |
204 | return -ENODEV; |
205 | ||
206 | gpio_set_value_cansleep(mt9m001->switch_gpio, go8bit); | |
207 | return 0; | |
208 | #else | |
209 | return -ENODEV; | |
210 | #endif | |
211 | } | |
212 | ||
ad5f2e85 GL |
213 | static int bus_switch_possible(struct mt9m001 *mt9m001) |
214 | { | |
215 | #ifdef CONFIG_MT9M001_PCA9536_SWITCH | |
216 | return gpio_is_valid(mt9m001->switch_gpio); | |
217 | #else | |
218 | return 0; | |
219 | #endif | |
220 | } | |
221 | ||
222 | static int mt9m001_set_bus_param(struct soc_camera_device *icd, | |
223 | unsigned long flags) | |
f523dd0d GL |
224 | { |
225 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
ad5f2e85 | 226 | unsigned int width_flag = flags & SOCAM_DATAWIDTH_MASK; |
f523dd0d | 227 | int ret; |
f523dd0d | 228 | |
ad5f2e85 | 229 | /* Flags validity verified in test_bus_param */ |
f523dd0d | 230 | |
ad5f2e85 GL |
231 | if ((mt9m001->datawidth != 10 && (width_flag == SOCAM_DATAWIDTH_10)) || |
232 | (mt9m001->datawidth != 9 && (width_flag == SOCAM_DATAWIDTH_9)) || | |
233 | (mt9m001->datawidth != 8 && (width_flag == SOCAM_DATAWIDTH_8))) { | |
f523dd0d | 234 | /* Well, we actually only can do 10 or 8 bits... */ |
ad5f2e85 | 235 | if (width_flag == SOCAM_DATAWIDTH_9) |
f523dd0d GL |
236 | return -EINVAL; |
237 | ret = bus_switch_act(mt9m001, | |
ad5f2e85 | 238 | width_flag == SOCAM_DATAWIDTH_8); |
f523dd0d GL |
239 | if (ret < 0) |
240 | return ret; | |
241 | ||
ad5f2e85 | 242 | mt9m001->datawidth = width_flag == SOCAM_DATAWIDTH_8 ? 8 : 10; |
f523dd0d GL |
243 | } |
244 | ||
ad5f2e85 GL |
245 | return 0; |
246 | } | |
247 | ||
248 | static unsigned long mt9m001_query_bus_param(struct soc_camera_device *icd) | |
249 | { | |
250 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
251 | unsigned int width_flag = SOCAM_DATAWIDTH_10; | |
252 | ||
253 | if (bus_switch_possible(mt9m001)) | |
254 | width_flag |= SOCAM_DATAWIDTH_8; | |
255 | ||
256 | /* MT9M001 has all capture_format parameters fixed */ | |
257 | return SOCAM_PCLK_SAMPLE_RISING | | |
258 | SOCAM_HSYNC_ACTIVE_HIGH | | |
259 | SOCAM_VSYNC_ACTIVE_HIGH | | |
260 | SOCAM_MASTER | | |
261 | width_flag; | |
262 | } | |
263 | ||
264 | static int mt9m001_set_fmt_cap(struct soc_camera_device *icd, | |
265 | __u32 pixfmt, struct v4l2_rect *rect) | |
266 | { | |
267 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
268 | int ret; | |
269 | const u16 hblank = 9, vblank = 25; | |
270 | ||
f523dd0d GL |
271 | /* Blanking and start values - default... */ |
272 | ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank); | |
273 | if (ret >= 0) | |
274 | ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank); | |
275 | ||
276 | /* The caller provides a supported format, as verified per | |
277 | * call to icd->try_fmt_cap() */ | |
278 | if (ret >= 0) | |
279 | ret = reg_write(icd, MT9M001_COLUMN_START, rect->left); | |
280 | if (ret >= 0) | |
281 | ret = reg_write(icd, MT9M001_ROW_START, rect->top); | |
282 | if (ret >= 0) | |
283 | ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1); | |
284 | if (ret >= 0) | |
285 | ret = reg_write(icd, MT9M001_WINDOW_HEIGHT, | |
286 | rect->height + icd->y_skip_top - 1); | |
287 | if (ret >= 0 && mt9m001->autoexposure) { | |
288 | ret = reg_write(icd, MT9M001_SHUTTER_WIDTH, | |
289 | rect->height + icd->y_skip_top + vblank); | |
290 | if (ret >= 0) { | |
291 | const struct v4l2_queryctrl *qctrl = | |
292 | soc_camera_find_qctrl(icd->ops, | |
293 | V4L2_CID_EXPOSURE); | |
294 | icd->exposure = (524 + (rect->height + icd->y_skip_top + | |
295 | vblank - 1) * | |
296 | (qctrl->maximum - qctrl->minimum)) / | |
297 | 1048 + qctrl->minimum; | |
298 | } | |
299 | } | |
300 | ||
301 | return ret < 0 ? ret : 0; | |
302 | } | |
303 | ||
304 | static int mt9m001_try_fmt_cap(struct soc_camera_device *icd, | |
305 | struct v4l2_format *f) | |
306 | { | |
307 | if (f->fmt.pix.height < 32 + icd->y_skip_top) | |
308 | f->fmt.pix.height = 32 + icd->y_skip_top; | |
309 | if (f->fmt.pix.height > 1024 + icd->y_skip_top) | |
310 | f->fmt.pix.height = 1024 + icd->y_skip_top; | |
311 | if (f->fmt.pix.width < 48) | |
312 | f->fmt.pix.width = 48; | |
313 | if (f->fmt.pix.width > 1280) | |
314 | f->fmt.pix.width = 1280; | |
315 | f->fmt.pix.width &= ~0x01; /* has to be even, unsure why was ~3 */ | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | static int mt9m001_get_chip_id(struct soc_camera_device *icd, | |
321 | struct v4l2_chip_ident *id) | |
322 | { | |
323 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
324 | ||
325 | if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR) | |
326 | return -EINVAL; | |
327 | ||
328 | if (id->match_chip != mt9m001->client->addr) | |
329 | return -ENODEV; | |
330 | ||
331 | id->ident = mt9m001->model; | |
332 | id->revision = 0; | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
338 | static int mt9m001_get_register(struct soc_camera_device *icd, | |
339 | struct v4l2_register *reg) | |
340 | { | |
341 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
342 | ||
343 | if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) | |
344 | return -EINVAL; | |
345 | ||
346 | if (reg->match_chip != mt9m001->client->addr) | |
347 | return -ENODEV; | |
348 | ||
349 | reg->val = reg_read(icd, reg->reg); | |
350 | ||
351 | if (reg->val > 0xffff) | |
352 | return -EIO; | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
357 | static int mt9m001_set_register(struct soc_camera_device *icd, | |
358 | struct v4l2_register *reg) | |
359 | { | |
360 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
361 | ||
362 | if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) | |
363 | return -EINVAL; | |
364 | ||
365 | if (reg->match_chip != mt9m001->client->addr) | |
366 | return -ENODEV; | |
367 | ||
368 | if (reg_write(icd, reg->reg, reg->val) < 0) | |
369 | return -EIO; | |
370 | ||
371 | return 0; | |
372 | } | |
373 | #endif | |
374 | ||
f523dd0d GL |
375 | const struct v4l2_queryctrl mt9m001_controls[] = { |
376 | { | |
377 | .id = V4L2_CID_VFLIP, | |
378 | .type = V4L2_CTRL_TYPE_BOOLEAN, | |
379 | .name = "Flip Vertically", | |
380 | .minimum = 0, | |
381 | .maximum = 1, | |
382 | .step = 1, | |
383 | .default_value = 0, | |
384 | }, { | |
385 | .id = V4L2_CID_GAIN, | |
386 | .type = V4L2_CTRL_TYPE_INTEGER, | |
387 | .name = "Gain", | |
388 | .minimum = 0, | |
389 | .maximum = 127, | |
390 | .step = 1, | |
391 | .default_value = 64, | |
392 | .flags = V4L2_CTRL_FLAG_SLIDER, | |
393 | }, { | |
394 | .id = V4L2_CID_EXPOSURE, | |
395 | .type = V4L2_CTRL_TYPE_INTEGER, | |
396 | .name = "Exposure", | |
397 | .minimum = 1, | |
398 | .maximum = 255, | |
399 | .step = 1, | |
400 | .default_value = 255, | |
401 | .flags = V4L2_CTRL_FLAG_SLIDER, | |
402 | }, { | |
403 | .id = V4L2_CID_EXPOSURE_AUTO, | |
404 | .type = V4L2_CTRL_TYPE_BOOLEAN, | |
405 | .name = "Automatic Exposure", | |
406 | .minimum = 0, | |
407 | .maximum = 1, | |
408 | .step = 1, | |
409 | .default_value = 1, | |
410 | } | |
411 | }; | |
412 | ||
413 | static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl); | |
414 | static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl); | |
415 | ||
416 | static struct soc_camera_ops mt9m001_ops = { | |
417 | .owner = THIS_MODULE, | |
418 | .init = mt9m001_init, | |
419 | .release = mt9m001_release, | |
420 | .start_capture = mt9m001_start_capture, | |
421 | .stop_capture = mt9m001_stop_capture, | |
ad5f2e85 | 422 | .set_fmt_cap = mt9m001_set_fmt_cap, |
f523dd0d | 423 | .try_fmt_cap = mt9m001_try_fmt_cap, |
ad5f2e85 GL |
424 | .set_bus_param = mt9m001_set_bus_param, |
425 | .query_bus_param = mt9m001_query_bus_param, | |
f523dd0d GL |
426 | .formats = NULL, /* Filled in later depending on the */ |
427 | .num_formats = 0, /* camera type and data widths */ | |
f523dd0d GL |
428 | .controls = mt9m001_controls, |
429 | .num_controls = ARRAY_SIZE(mt9m001_controls), | |
430 | .get_control = mt9m001_get_control, | |
431 | .set_control = mt9m001_set_control, | |
432 | .get_chip_id = mt9m001_get_chip_id, | |
433 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
434 | .get_register = mt9m001_get_register, | |
435 | .set_register = mt9m001_set_register, | |
436 | #endif | |
437 | }; | |
438 | ||
439 | static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl) | |
440 | { | |
441 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
442 | int data; | |
443 | ||
444 | switch (ctrl->id) { | |
445 | case V4L2_CID_VFLIP: | |
446 | data = reg_read(icd, MT9M001_READ_OPTIONS2); | |
447 | if (data < 0) | |
448 | return -EIO; | |
449 | ctrl->value = !!(data & 0x8000); | |
450 | break; | |
451 | case V4L2_CID_EXPOSURE_AUTO: | |
452 | ctrl->value = mt9m001->autoexposure; | |
453 | break; | |
454 | } | |
455 | return 0; | |
456 | } | |
457 | ||
458 | static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl) | |
459 | { | |
460 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
461 | const struct v4l2_queryctrl *qctrl; | |
462 | int data; | |
463 | ||
464 | qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id); | |
465 | ||
466 | if (!qctrl) | |
467 | return -EINVAL; | |
468 | ||
469 | switch (ctrl->id) { | |
470 | case V4L2_CID_VFLIP: | |
471 | if (ctrl->value) | |
472 | data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000); | |
473 | else | |
474 | data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000); | |
475 | if (data < 0) | |
476 | return -EIO; | |
477 | break; | |
478 | case V4L2_CID_GAIN: | |
479 | if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum) | |
480 | return -EINVAL; | |
481 | /* See Datasheet Table 7, Gain settings. */ | |
482 | if (ctrl->value <= qctrl->default_value) { | |
483 | /* Pack it into 0..1 step 0.125, register values 0..8 */ | |
484 | unsigned long range = qctrl->default_value - qctrl->minimum; | |
485 | data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range; | |
486 | ||
487 | dev_dbg(&icd->dev, "Setting gain %d\n", data); | |
488 | data = reg_write(icd, MT9M001_GLOBAL_GAIN, data); | |
489 | if (data < 0) | |
490 | return -EIO; | |
491 | } else { | |
492 | /* Pack it into 1.125..15 variable step, register values 9..67 */ | |
493 | /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */ | |
494 | unsigned long range = qctrl->maximum - qctrl->default_value - 1; | |
495 | unsigned long gain = ((ctrl->value - qctrl->default_value - 1) * | |
496 | 111 + range / 2) / range + 9; | |
497 | ||
498 | if (gain <= 32) | |
499 | data = gain; | |
500 | else if (gain <= 64) | |
501 | data = ((gain - 32) * 16 + 16) / 32 + 80; | |
502 | else | |
503 | data = ((gain - 64) * 7 + 28) / 56 + 96; | |
504 | ||
505 | dev_dbg(&icd->dev, "Setting gain from %d to %d\n", | |
506 | reg_read(icd, MT9M001_GLOBAL_GAIN), data); | |
507 | data = reg_write(icd, MT9M001_GLOBAL_GAIN, data); | |
508 | if (data < 0) | |
509 | return -EIO; | |
510 | } | |
511 | ||
512 | /* Success */ | |
513 | icd->gain = ctrl->value; | |
514 | break; | |
515 | case V4L2_CID_EXPOSURE: | |
516 | /* mt9m001 has maximum == default */ | |
517 | if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum) | |
518 | return -EINVAL; | |
519 | else { | |
520 | unsigned long range = qctrl->maximum - qctrl->minimum; | |
521 | unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 + | |
522 | range / 2) / range + 1; | |
523 | ||
524 | dev_dbg(&icd->dev, "Setting shutter width from %d to %lu\n", | |
525 | reg_read(icd, MT9M001_SHUTTER_WIDTH), shutter); | |
526 | if (reg_write(icd, MT9M001_SHUTTER_WIDTH, shutter) < 0) | |
527 | return -EIO; | |
528 | icd->exposure = ctrl->value; | |
529 | mt9m001->autoexposure = 0; | |
530 | } | |
531 | break; | |
532 | case V4L2_CID_EXPOSURE_AUTO: | |
533 | if (ctrl->value) { | |
534 | const u16 vblank = 25; | |
535 | if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height + | |
536 | icd->y_skip_top + vblank) < 0) | |
537 | return -EIO; | |
538 | qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE); | |
539 | icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) * | |
540 | (qctrl->maximum - qctrl->minimum)) / | |
541 | 1048 + qctrl->minimum; | |
542 | mt9m001->autoexposure = 1; | |
543 | } else | |
544 | mt9m001->autoexposure = 0; | |
545 | break; | |
546 | } | |
547 | return 0; | |
548 | } | |
549 | ||
550 | /* Interface active, can use i2c. If it fails, it can indeed mean, that | |
551 | * this wasn't our capture interface, so, we wait for the right one */ | |
552 | static int mt9m001_video_probe(struct soc_camera_device *icd) | |
553 | { | |
554 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
555 | s32 data; | |
556 | int ret; | |
557 | ||
558 | /* We must have a parent by now. And it cannot be a wrong one. | |
559 | * So this entire test is completely redundant. */ | |
560 | if (!icd->dev.parent || | |
561 | to_soc_camera_host(icd->dev.parent)->nr != icd->iface) | |
562 | return -ENODEV; | |
563 | ||
564 | /* Enable the chip */ | |
565 | data = reg_write(&mt9m001->icd, MT9M001_CHIP_ENABLE, 1); | |
566 | dev_dbg(&icd->dev, "write: %d\n", data); | |
567 | ||
568 | /* Read out the chip version register */ | |
569 | data = reg_read(icd, MT9M001_CHIP_VERSION); | |
570 | ||
571 | /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */ | |
572 | switch (data) { | |
573 | case 0x8411: | |
574 | case 0x8421: | |
575 | mt9m001->model = V4L2_IDENT_MT9M001C12ST; | |
576 | mt9m001_ops.formats = mt9m001_colour_formats; | |
bb55de3b GL |
577 | if (mt9m001->client->dev.platform_data) |
578 | mt9m001_ops.num_formats = ARRAY_SIZE(mt9m001_colour_formats); | |
579 | else | |
580 | mt9m001_ops.num_formats = 1; | |
f523dd0d GL |
581 | break; |
582 | case 0x8431: | |
583 | mt9m001->model = V4L2_IDENT_MT9M001C12STM; | |
584 | mt9m001_ops.formats = mt9m001_monochrome_formats; | |
585 | if (mt9m001->client->dev.platform_data) | |
586 | mt9m001_ops.num_formats = ARRAY_SIZE(mt9m001_monochrome_formats); | |
587 | else | |
588 | mt9m001_ops.num_formats = 1; | |
589 | break; | |
590 | default: | |
591 | ret = -ENODEV; | |
592 | dev_err(&icd->dev, | |
593 | "No MT9M001 chip detected, register read %x\n", data); | |
594 | goto ei2c; | |
595 | } | |
596 | ||
597 | dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data, | |
598 | data == 0x8431 ? "C12STM" : "C12ST"); | |
599 | ||
600 | /* Now that we know the model, we can start video */ | |
601 | ret = soc_camera_video_start(icd); | |
602 | if (ret) | |
603 | goto eisis; | |
604 | ||
605 | return 0; | |
606 | ||
607 | eisis: | |
608 | ei2c: | |
609 | return ret; | |
610 | } | |
611 | ||
612 | static void mt9m001_video_remove(struct soc_camera_device *icd) | |
613 | { | |
614 | struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); | |
615 | ||
616 | dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr, | |
617 | mt9m001->icd.dev.parent, mt9m001->icd.vdev); | |
618 | soc_camera_video_stop(&mt9m001->icd); | |
619 | } | |
620 | ||
621 | static int mt9m001_probe(struct i2c_client *client) | |
622 | { | |
623 | struct mt9m001 *mt9m001; | |
624 | struct soc_camera_device *icd; | |
625 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
626 | struct soc_camera_link *icl = client->dev.platform_data; | |
627 | int ret; | |
628 | ||
629 | if (!icl) { | |
630 | dev_err(&client->dev, "MT9M001 driver needs platform data\n"); | |
631 | return -EINVAL; | |
632 | } | |
633 | ||
634 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) { | |
635 | dev_warn(&adapter->dev, | |
636 | "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); | |
637 | return -EIO; | |
638 | } | |
639 | ||
640 | mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL); | |
641 | if (!mt9m001) | |
642 | return -ENOMEM; | |
643 | ||
644 | mt9m001->client = client; | |
645 | i2c_set_clientdata(client, mt9m001); | |
646 | ||
647 | /* Second stage probe - when a capture adapter is there */ | |
648 | icd = &mt9m001->icd; | |
649 | icd->probe = mt9m001_video_probe; | |
650 | icd->remove = mt9m001_video_remove; | |
651 | icd->ops = &mt9m001_ops; | |
652 | icd->control = &client->dev; | |
653 | icd->x_min = 20; | |
654 | icd->y_min = 12; | |
655 | icd->x_current = 20; | |
656 | icd->y_current = 12; | |
657 | icd->width_min = 48; | |
658 | icd->width_max = 1280; | |
659 | icd->height_min = 32; | |
660 | icd->height_max = 1024; | |
661 | icd->y_skip_top = 1; | |
662 | icd->iface = icl->bus_id; | |
663 | /* Default datawidth - this is the only width this camera (normally) | |
664 | * supports. It is only with extra logic that it can support | |
665 | * other widths. Therefore it seems to be a sensible default. */ | |
666 | mt9m001->datawidth = 10; | |
667 | /* Simulated autoexposure. If enabled, we calculate shutter width | |
668 | * ourselves in the driver based on vertical blanking and frame width */ | |
669 | mt9m001->autoexposure = 1; | |
670 | ||
671 | ret = bus_switch_request(mt9m001, icl); | |
672 | if (ret) | |
673 | goto eswinit; | |
674 | ||
675 | ret = soc_camera_device_register(icd); | |
676 | if (ret) | |
677 | goto eisdr; | |
678 | ||
679 | return 0; | |
680 | ||
681 | eisdr: | |
682 | bus_switch_release(mt9m001); | |
683 | eswinit: | |
684 | kfree(mt9m001); | |
685 | return ret; | |
686 | } | |
687 | ||
688 | static int mt9m001_remove(struct i2c_client *client) | |
689 | { | |
690 | struct mt9m001 *mt9m001 = i2c_get_clientdata(client); | |
691 | ||
692 | soc_camera_device_unregister(&mt9m001->icd); | |
693 | bus_switch_release(mt9m001); | |
694 | kfree(mt9m001); | |
695 | ||
696 | return 0; | |
697 | } | |
698 | ||
699 | static struct i2c_driver mt9m001_i2c_driver = { | |
700 | .driver = { | |
701 | .name = "mt9m001", | |
702 | }, | |
703 | .probe = mt9m001_probe, | |
704 | .remove = mt9m001_remove, | |
705 | }; | |
706 | ||
707 | static int __init mt9m001_mod_init(void) | |
708 | { | |
709 | return i2c_add_driver(&mt9m001_i2c_driver); | |
710 | } | |
711 | ||
712 | static void __exit mt9m001_mod_exit(void) | |
713 | { | |
714 | i2c_del_driver(&mt9m001_i2c_driver); | |
715 | } | |
716 | ||
717 | module_init(mt9m001_mod_init); | |
718 | module_exit(mt9m001_mod_exit); | |
719 | ||
720 | MODULE_DESCRIPTION("Micron MT9M001 Camera driver"); | |
721 | MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>"); | |
722 | MODULE_LICENSE("GPL"); |