2 * Driver for MT9M001 CMOS Image Sensor from Micron
4 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
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.
11 #include <linux/videodev2.h>
12 #include <linux/slab.h>
13 #include <linux/i2c.h>
14 #include <linux/log2.h>
16 #include <media/v4l2-common.h>
17 #include <media/v4l2-chip-ident.h>
18 #include <media/soc_camera.h>
20 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
24 /* mt9m001 i2c address 0x5d
25 * The platform has to define i2c_board_info
26 * and call i2c_register_board_info() */
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
46 static const struct soc_camera_data_format mt9m001_colour_formats[] = {
47 /* Order important: first natively supported,
48 * second supported with a GPIO extender */
50 .name = "Bayer (sRGB) 10 bit",
52 .fourcc = V4L2_PIX_FMT_SBGGR16,
53 .colorspace = V4L2_COLORSPACE_SRGB,
55 .name = "Bayer (sRGB) 8 bit",
57 .fourcc = V4L2_PIX_FMT_SBGGR8,
58 .colorspace = V4L2_COLORSPACE_SRGB,
62 static const struct soc_camera_data_format mt9m001_monochrome_formats[] = {
63 /* Order important - see above */
65 .name = "Monochrome 10 bit",
67 .fourcc = V4L2_PIX_FMT_Y16,
69 .name = "Monochrome 8 bit",
71 .fourcc = V4L2_PIX_FMT_GREY,
76 struct i2c_client *client;
77 struct soc_camera_device icd;
78 int model; /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
80 unsigned char autoexposure;
81 unsigned char datawidth;
84 static int reg_read(struct soc_camera_device *icd, const u8 reg)
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);
92 static int reg_write(struct soc_camera_device *icd, const u8 reg,
95 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
96 return i2c_smbus_write_word_data(mt9m001->client, reg, swab16(data));
99 static int reg_set(struct soc_camera_device *icd, const u8 reg,
104 ret = reg_read(icd, reg);
107 return reg_write(icd, reg, ret | data);
110 static int reg_clear(struct soc_camera_device *icd, const u8 reg,
115 ret = reg_read(icd, reg);
118 return reg_write(icd, reg, ret & ~data);
121 static int mt9m001_init(struct soc_camera_device *icd)
125 /* Disable chip, synchronous option update */
126 dev_dbg(icd->vdev->dev, "%s\n", __func__);
128 ret = reg_write(icd, MT9M001_RESET, 1);
130 ret = reg_write(icd, MT9M001_RESET, 0);
132 ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
134 return ret >= 0 ? 0 : -EIO;
137 static int mt9m001_release(struct soc_camera_device *icd)
139 /* Disable the chip */
140 reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
144 static int mt9m001_start_capture(struct soc_camera_device *icd)
146 /* Switch to master "normal" mode */
147 if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0)
152 static int mt9m001_stop_capture(struct soc_camera_device *icd)
154 /* Stop sensor readout */
155 if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0)
160 static int bus_switch_request(struct mt9m001 *mt9m001,
161 struct soc_camera_link *icl)
163 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
165 unsigned int gpio = icl->gpio;
167 if (gpio_is_valid(gpio)) {
168 /* We have a data bus switch. */
169 ret = gpio_request(gpio, "mt9m001");
171 dev_err(&mt9m001->client->dev, "Cannot get GPIO %u\n",
176 ret = gpio_direction_output(gpio, 0);
178 dev_err(&mt9m001->client->dev,
179 "Cannot set GPIO %u to output\n", gpio);
185 mt9m001->switch_gpio = gpio;
187 mt9m001->switch_gpio = -EINVAL;
192 static void bus_switch_release(struct mt9m001 *mt9m001)
194 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
195 if (gpio_is_valid(mt9m001->switch_gpio))
196 gpio_free(mt9m001->switch_gpio);
200 static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit)
202 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
203 if (!gpio_is_valid(mt9m001->switch_gpio))
206 gpio_set_value_cansleep(mt9m001->switch_gpio, go8bit);
213 static int bus_switch_possible(struct mt9m001 *mt9m001)
215 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
216 return gpio_is_valid(mt9m001->switch_gpio);
222 static int mt9m001_set_bus_param(struct soc_camera_device *icd,
225 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
226 unsigned int width_flag = flags & SOCAM_DATAWIDTH_MASK;
229 /* Flags validity verified in test_bus_param */
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))) {
234 /* Well, we actually only can do 10 or 8 bits... */
235 if (width_flag == SOCAM_DATAWIDTH_9)
237 ret = bus_switch_act(mt9m001,
238 width_flag == SOCAM_DATAWIDTH_8);
242 mt9m001->datawidth = width_flag == SOCAM_DATAWIDTH_8 ? 8 : 10;
248 static unsigned long mt9m001_query_bus_param(struct soc_camera_device *icd)
250 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
251 unsigned int width_flag = SOCAM_DATAWIDTH_10;
253 if (bus_switch_possible(mt9m001))
254 width_flag |= SOCAM_DATAWIDTH_8;
256 /* MT9M001 has all capture_format parameters fixed */
257 return SOCAM_PCLK_SAMPLE_RISING |
258 SOCAM_HSYNC_ACTIVE_HIGH |
259 SOCAM_VSYNC_ACTIVE_HIGH |
264 static int mt9m001_set_fmt_cap(struct soc_camera_device *icd,
265 __u32 pixfmt, struct v4l2_rect *rect)
267 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
269 const u16 hblank = 9, vblank = 25;
271 /* Blanking and start values - default... */
272 ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank);
274 ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank);
276 /* The caller provides a supported format, as verified per
277 * call to icd->try_fmt_cap() */
279 ret = reg_write(icd, MT9M001_COLUMN_START, rect->left);
281 ret = reg_write(icd, MT9M001_ROW_START, rect->top);
283 ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1);
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);
291 const struct v4l2_queryctrl *qctrl =
292 soc_camera_find_qctrl(icd->ops,
294 icd->exposure = (524 + (rect->height + icd->y_skip_top +
296 (qctrl->maximum - qctrl->minimum)) /
297 1048 + qctrl->minimum;
301 return ret < 0 ? ret : 0;
304 static int mt9m001_try_fmt_cap(struct soc_camera_device *icd,
305 struct v4l2_format *f)
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 */
320 static int mt9m001_get_chip_id(struct soc_camera_device *icd,
321 struct v4l2_chip_ident *id)
323 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
325 if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR)
328 if (id->match_chip != mt9m001->client->addr)
331 id->ident = mt9m001->model;
337 #ifdef CONFIG_VIDEO_ADV_DEBUG
338 static int mt9m001_get_register(struct soc_camera_device *icd,
339 struct v4l2_register *reg)
341 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
343 if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
346 if (reg->match_chip != mt9m001->client->addr)
349 reg->val = reg_read(icd, reg->reg);
351 if (reg->val > 0xffff)
357 static int mt9m001_set_register(struct soc_camera_device *icd,
358 struct v4l2_register *reg)
360 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
362 if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
365 if (reg->match_chip != mt9m001->client->addr)
368 if (reg_write(icd, reg->reg, reg->val) < 0)
375 const struct v4l2_queryctrl mt9m001_controls[] = {
377 .id = V4L2_CID_VFLIP,
378 .type = V4L2_CTRL_TYPE_BOOLEAN,
379 .name = "Flip Vertically",
386 .type = V4L2_CTRL_TYPE_INTEGER,
392 .flags = V4L2_CTRL_FLAG_SLIDER,
394 .id = V4L2_CID_EXPOSURE,
395 .type = V4L2_CTRL_TYPE_INTEGER,
400 .default_value = 255,
401 .flags = V4L2_CTRL_FLAG_SLIDER,
403 .id = V4L2_CID_EXPOSURE_AUTO,
404 .type = V4L2_CTRL_TYPE_BOOLEAN,
405 .name = "Automatic Exposure",
413 static int mt9m001_video_probe(struct soc_camera_device *);
414 static void mt9m001_video_remove(struct soc_camera_device *);
415 static int mt9m001_get_control(struct soc_camera_device *, struct v4l2_control *);
416 static int mt9m001_set_control(struct soc_camera_device *, struct v4l2_control *);
418 static struct soc_camera_ops mt9m001_ops = {
419 .owner = THIS_MODULE,
420 .probe = mt9m001_video_probe,
421 .remove = mt9m001_video_remove,
422 .init = mt9m001_init,
423 .release = mt9m001_release,
424 .start_capture = mt9m001_start_capture,
425 .stop_capture = mt9m001_stop_capture,
426 .set_fmt_cap = mt9m001_set_fmt_cap,
427 .try_fmt_cap = mt9m001_try_fmt_cap,
428 .set_bus_param = mt9m001_set_bus_param,
429 .query_bus_param = mt9m001_query_bus_param,
430 .controls = mt9m001_controls,
431 .num_controls = ARRAY_SIZE(mt9m001_controls),
432 .get_control = mt9m001_get_control,
433 .set_control = mt9m001_set_control,
434 .get_chip_id = mt9m001_get_chip_id,
435 #ifdef CONFIG_VIDEO_ADV_DEBUG
436 .get_register = mt9m001_get_register,
437 .set_register = mt9m001_set_register,
441 static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
443 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
448 data = reg_read(icd, MT9M001_READ_OPTIONS2);
451 ctrl->value = !!(data & 0x8000);
453 case V4L2_CID_EXPOSURE_AUTO:
454 ctrl->value = mt9m001->autoexposure;
460 static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
462 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
463 const struct v4l2_queryctrl *qctrl;
466 qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id);
474 data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000);
476 data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000);
481 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
483 /* See Datasheet Table 7, Gain settings. */
484 if (ctrl->value <= qctrl->default_value) {
485 /* Pack it into 0..1 step 0.125, register values 0..8 */
486 unsigned long range = qctrl->default_value - qctrl->minimum;
487 data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
489 dev_dbg(&icd->dev, "Setting gain %d\n", data);
490 data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
494 /* Pack it into 1.125..15 variable step, register values 9..67 */
495 /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
496 unsigned long range = qctrl->maximum - qctrl->default_value - 1;
497 unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
498 111 + range / 2) / range + 9;
503 data = ((gain - 32) * 16 + 16) / 32 + 80;
505 data = ((gain - 64) * 7 + 28) / 56 + 96;
507 dev_dbg(&icd->dev, "Setting gain from %d to %d\n",
508 reg_read(icd, MT9M001_GLOBAL_GAIN), data);
509 data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
515 icd->gain = ctrl->value;
517 case V4L2_CID_EXPOSURE:
518 /* mt9m001 has maximum == default */
519 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
522 unsigned long range = qctrl->maximum - qctrl->minimum;
523 unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 +
524 range / 2) / range + 1;
526 dev_dbg(&icd->dev, "Setting shutter width from %d to %lu\n",
527 reg_read(icd, MT9M001_SHUTTER_WIDTH), shutter);
528 if (reg_write(icd, MT9M001_SHUTTER_WIDTH, shutter) < 0)
530 icd->exposure = ctrl->value;
531 mt9m001->autoexposure = 0;
534 case V4L2_CID_EXPOSURE_AUTO:
536 const u16 vblank = 25;
537 if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height +
538 icd->y_skip_top + vblank) < 0)
540 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
541 icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) *
542 (qctrl->maximum - qctrl->minimum)) /
543 1048 + qctrl->minimum;
544 mt9m001->autoexposure = 1;
546 mt9m001->autoexposure = 0;
552 /* Interface active, can use i2c. If it fails, it can indeed mean, that
553 * this wasn't our capture interface, so, we wait for the right one */
554 static int mt9m001_video_probe(struct soc_camera_device *icd)
556 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
560 /* We must have a parent by now. And it cannot be a wrong one.
561 * So this entire test is completely redundant. */
562 if (!icd->dev.parent ||
563 to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
566 /* Enable the chip */
567 data = reg_write(&mt9m001->icd, MT9M001_CHIP_ENABLE, 1);
568 dev_dbg(&icd->dev, "write: %d\n", data);
570 /* Read out the chip version register */
571 data = reg_read(icd, MT9M001_CHIP_VERSION);
573 /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
577 mt9m001->model = V4L2_IDENT_MT9M001C12ST;
578 icd->formats = mt9m001_colour_formats;
579 if (mt9m001->client->dev.platform_data)
580 icd->num_formats = ARRAY_SIZE(mt9m001_colour_formats);
582 icd->num_formats = 1;
585 mt9m001->model = V4L2_IDENT_MT9M001C12STM;
586 icd->formats = mt9m001_monochrome_formats;
587 if (mt9m001->client->dev.platform_data)
588 icd->num_formats = ARRAY_SIZE(mt9m001_monochrome_formats);
590 icd->num_formats = 1;
595 "No MT9M001 chip detected, register read %x\n", data);
599 dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
600 data == 0x8431 ? "C12STM" : "C12ST");
602 /* Now that we know the model, we can start video */
603 ret = soc_camera_video_start(icd);
614 static void mt9m001_video_remove(struct soc_camera_device *icd)
616 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
618 dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr,
619 mt9m001->icd.dev.parent, mt9m001->icd.vdev);
620 soc_camera_video_stop(&mt9m001->icd);
623 static int mt9m001_probe(struct i2c_client *client)
625 struct mt9m001 *mt9m001;
626 struct soc_camera_device *icd;
627 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
628 struct soc_camera_link *icl = client->dev.platform_data;
632 dev_err(&client->dev, "MT9M001 driver needs platform data\n");
636 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
637 dev_warn(&adapter->dev,
638 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
642 mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL);
646 mt9m001->client = client;
647 i2c_set_clientdata(client, mt9m001);
649 /* Second stage probe - when a capture adapter is there */
651 icd->ops = &mt9m001_ops;
652 icd->control = &client->dev;
658 icd->width_max = 1280;
659 icd->height_min = 32;
660 icd->height_max = 1024;
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;
671 ret = bus_switch_request(mt9m001, icl);
675 ret = soc_camera_device_register(icd);
682 bus_switch_release(mt9m001);
688 static int mt9m001_remove(struct i2c_client *client)
690 struct mt9m001 *mt9m001 = i2c_get_clientdata(client);
692 soc_camera_device_unregister(&mt9m001->icd);
693 bus_switch_release(mt9m001);
699 static struct i2c_driver mt9m001_i2c_driver = {
703 .probe = mt9m001_probe,
704 .remove = mt9m001_remove,
707 static int __init mt9m001_mod_init(void)
709 return i2c_add_driver(&mt9m001_i2c_driver);
712 static void __exit mt9m001_mod_exit(void)
714 i2c_del_driver(&mt9m001_i2c_driver);
717 module_init(mt9m001_mod_init);
718 module_exit(mt9m001_mod_exit);
720 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
721 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
722 MODULE_LICENSE("GPL");