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>
15 #include <linux/gpio.h>
17 #include <media/v4l2-common.h>
18 #include <media/v4l2-chip-ident.h>
19 #include <media/soc_camera.h>
21 /* mt9m001 i2c address 0x5d
22 * The platform has to define i2c_board_info
23 * and call i2c_register_board_info() */
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
43 static const struct soc_camera_data_format mt9m001_colour_formats[] = {
44 /* Order important: first natively supported,
45 * second supported with a GPIO extender */
47 .name = "Bayer (sRGB) 10 bit",
49 .fourcc = V4L2_PIX_FMT_SBGGR16,
50 .colorspace = V4L2_COLORSPACE_SRGB,
52 .name = "Bayer (sRGB) 8 bit",
54 .fourcc = V4L2_PIX_FMT_SBGGR8,
55 .colorspace = V4L2_COLORSPACE_SRGB,
59 static const struct soc_camera_data_format mt9m001_monochrome_formats[] = {
60 /* Order important - see above */
62 .name = "Monochrome 10 bit",
64 .fourcc = V4L2_PIX_FMT_Y16,
66 .name = "Monochrome 8 bit",
68 .fourcc = V4L2_PIX_FMT_GREY,
73 struct i2c_client *client;
74 struct soc_camera_device icd;
75 int model; /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
77 unsigned char autoexposure;
78 unsigned char datawidth;
81 static int reg_read(struct soc_camera_device *icd, const u8 reg)
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);
89 static int reg_write(struct soc_camera_device *icd, const u8 reg,
92 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
93 return i2c_smbus_write_word_data(mt9m001->client, reg, swab16(data));
96 static int reg_set(struct soc_camera_device *icd, const u8 reg,
101 ret = reg_read(icd, reg);
104 return reg_write(icd, reg, ret | data);
107 static int reg_clear(struct soc_camera_device *icd, const u8 reg,
112 ret = reg_read(icd, reg);
115 return reg_write(icd, reg, ret & ~data);
118 static int mt9m001_init(struct soc_camera_device *icd)
120 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
121 struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
124 dev_dbg(icd->vdev->parent, "%s\n", __func__);
127 ret = icl->power(&mt9m001->client->dev, 1);
129 dev_err(icd->vdev->parent,
130 "Platform failed to power-on the camera.\n");
135 /* The camera could have been already on, we reset it additionally */
137 ret = icl->reset(&mt9m001->client->dev);
142 /* Either no platform reset, or platform reset failed */
143 ret = reg_write(icd, MT9M001_RESET, 1);
145 ret = reg_write(icd, MT9M001_RESET, 0);
147 /* Disable chip, synchronous option update */
149 ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
154 static int mt9m001_release(struct soc_camera_device *icd)
156 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
157 struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
159 /* Disable the chip */
160 reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
163 icl->power(&mt9m001->client->dev, 0);
168 static int mt9m001_start_capture(struct soc_camera_device *icd)
170 /* Switch to master "normal" mode */
171 if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0)
176 static int mt9m001_stop_capture(struct soc_camera_device *icd)
178 /* Stop sensor readout */
179 if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0)
184 static int bus_switch_request(struct mt9m001 *mt9m001,
185 struct soc_camera_link *icl)
187 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
189 unsigned int gpio = icl->gpio;
191 if (gpio_is_valid(gpio)) {
192 /* We have a data bus switch. */
193 ret = gpio_request(gpio, "mt9m001");
195 dev_err(&mt9m001->client->dev, "Cannot get GPIO %u\n",
200 ret = gpio_direction_output(gpio, 0);
202 dev_err(&mt9m001->client->dev,
203 "Cannot set GPIO %u to output\n", gpio);
209 mt9m001->switch_gpio = gpio;
211 mt9m001->switch_gpio = -EINVAL;
216 static void bus_switch_release(struct mt9m001 *mt9m001)
218 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
219 if (gpio_is_valid(mt9m001->switch_gpio))
220 gpio_free(mt9m001->switch_gpio);
224 static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit)
226 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
227 if (!gpio_is_valid(mt9m001->switch_gpio))
230 gpio_set_value_cansleep(mt9m001->switch_gpio, go8bit);
237 static int bus_switch_possible(struct mt9m001 *mt9m001)
239 #ifdef CONFIG_MT9M001_PCA9536_SWITCH
240 return gpio_is_valid(mt9m001->switch_gpio);
246 static int mt9m001_set_bus_param(struct soc_camera_device *icd,
249 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
250 unsigned int width_flag = flags & SOCAM_DATAWIDTH_MASK;
253 /* Flags validity verified in test_bus_param */
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)
261 ret = bus_switch_act(mt9m001,
262 width_flag == SOCAM_DATAWIDTH_8);
266 mt9m001->datawidth = width_flag == SOCAM_DATAWIDTH_8 ? 8 : 10;
272 static unsigned long mt9m001_query_bus_param(struct soc_camera_device *icd)
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 |
281 if (bus_switch_possible(mt9m001))
282 flags |= SOCAM_DATAWIDTH_8;
284 return soc_camera_apply_sensor_flags(icl, flags);
287 static int mt9m001_set_fmt(struct soc_camera_device *icd,
288 __u32 pixfmt, struct v4l2_rect *rect)
290 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
292 const u16 hblank = 9, vblank = 25;
294 /* Blanking and start values - default... */
295 ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank);
297 ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank);
299 /* The caller provides a supported format, as verified per
300 * call to icd->try_fmt() */
302 ret = reg_write(icd, MT9M001_COLUMN_START, rect->left);
304 ret = reg_write(icd, MT9M001_ROW_START, rect->top);
306 ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1);
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);
314 const struct v4l2_queryctrl *qctrl =
315 soc_camera_find_qctrl(icd->ops,
317 icd->exposure = (524 + (rect->height + icd->y_skip_top +
319 (qctrl->maximum - qctrl->minimum)) /
320 1048 + qctrl->minimum;
327 static int mt9m001_try_fmt(struct soc_camera_device *icd,
328 struct v4l2_format *f)
330 struct v4l2_pix_format *pix = &f->fmt.pix;
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;
338 if (pix->width > 1280)
340 pix->width &= ~0x01; /* has to be even, unsure why was ~3 */
345 static int mt9m001_get_chip_id(struct soc_camera_device *icd,
346 struct v4l2_chip_ident *id)
348 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
350 if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR)
353 if (id->match_chip != mt9m001->client->addr)
356 id->ident = mt9m001->model;
362 #ifdef CONFIG_VIDEO_ADV_DEBUG
363 static int mt9m001_get_register(struct soc_camera_device *icd,
364 struct v4l2_register *reg)
366 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
368 if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
371 if (reg->match_chip != mt9m001->client->addr)
374 reg->val = reg_read(icd, reg->reg);
376 if (reg->val > 0xffff)
382 static int mt9m001_set_register(struct soc_camera_device *icd,
383 struct v4l2_register *reg)
385 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
387 if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
390 if (reg->match_chip != mt9m001->client->addr)
393 if (reg_write(icd, reg->reg, reg->val) < 0)
400 static const struct v4l2_queryctrl mt9m001_controls[] = {
402 .id = V4L2_CID_VFLIP,
403 .type = V4L2_CTRL_TYPE_BOOLEAN,
404 .name = "Flip Vertically",
411 .type = V4L2_CTRL_TYPE_INTEGER,
417 .flags = V4L2_CTRL_FLAG_SLIDER,
419 .id = V4L2_CID_EXPOSURE,
420 .type = V4L2_CTRL_TYPE_INTEGER,
425 .default_value = 255,
426 .flags = V4L2_CTRL_FLAG_SLIDER,
428 .id = V4L2_CID_EXPOSURE_AUTO,
429 .type = V4L2_CTRL_TYPE_BOOLEAN,
430 .name = "Automatic Exposure",
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 *);
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,
466 static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
468 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
473 data = reg_read(icd, MT9M001_READ_OPTIONS2);
476 ctrl->value = !!(data & 0x8000);
478 case V4L2_CID_EXPOSURE_AUTO:
479 ctrl->value = mt9m001->autoexposure;
485 static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
487 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
488 const struct v4l2_queryctrl *qctrl;
491 qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id);
499 data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000);
501 data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000);
506 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
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;
514 dev_dbg(&icd->dev, "Setting gain %d\n", data);
515 data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
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;
528 data = ((gain - 32) * 16 + 16) / 32 + 80;
530 data = ((gain - 64) * 7 + 28) / 56 + 96;
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);
540 icd->gain = ctrl->value;
542 case V4L2_CID_EXPOSURE:
543 /* mt9m001 has maximum == default */
544 if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
547 unsigned long range = qctrl->maximum - qctrl->minimum;
548 unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 +
549 range / 2) / range + 1;
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)
555 icd->exposure = ctrl->value;
556 mt9m001->autoexposure = 0;
559 case V4L2_CID_EXPOSURE_AUTO:
561 const u16 vblank = 25;
562 if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height +
563 icd->y_skip_top + vblank) < 0)
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;
571 mt9m001->autoexposure = 0;
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)
581 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
582 struct soc_camera_link *icl = mt9m001->client->dev.platform_data;
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)
592 /* Enable the chip */
593 data = reg_write(icd, MT9M001_CHIP_ENABLE, 1);
594 dev_dbg(&icd->dev, "write: %d\n", data);
596 /* Read out the chip version register */
597 data = reg_read(icd, MT9M001_CHIP_VERSION);
599 /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
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);
608 icd->num_formats = 1;
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);
616 icd->num_formats = 1;
621 "No MT9M001 chip detected, register read %x\n", data);
625 dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
626 data == 0x8431 ? "C12STM" : "C12ST");
628 /* Now that we know the model, we can start video */
629 ret = soc_camera_video_start(icd);
640 static void mt9m001_video_remove(struct soc_camera_device *icd)
642 struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
644 dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr,
645 icd->dev.parent, icd->vdev);
646 soc_camera_video_stop(icd);
649 static int mt9m001_probe(struct i2c_client *client,
650 const struct i2c_device_id *did)
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;
659 dev_err(&client->dev, "MT9M001 driver needs platform data\n");
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");
669 mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL);
673 mt9m001->client = client;
674 i2c_set_clientdata(client, mt9m001);
676 /* Second stage probe - when a capture adapter is there */
678 icd->ops = &mt9m001_ops;
679 icd->control = &client->dev;
685 icd->width_max = 1280;
686 icd->height_min = 32;
687 icd->height_max = 1024;
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;
698 ret = bus_switch_request(mt9m001, icl);
702 ret = soc_camera_device_register(icd);
709 bus_switch_release(mt9m001);
715 static int mt9m001_remove(struct i2c_client *client)
717 struct mt9m001 *mt9m001 = i2c_get_clientdata(client);
719 soc_camera_device_unregister(&mt9m001->icd);
720 bus_switch_release(mt9m001);
726 static const struct i2c_device_id mt9m001_id[] = {
730 MODULE_DEVICE_TABLE(i2c, mt9m001_id);
732 static struct i2c_driver mt9m001_i2c_driver = {
736 .probe = mt9m001_probe,
737 .remove = mt9m001_remove,
738 .id_table = mt9m001_id,
741 static int __init mt9m001_mod_init(void)
743 return i2c_add_driver(&mt9m001_i2c_driver);
746 static void __exit mt9m001_mod_exit(void)
748 i2c_del_driver(&mt9m001_i2c_driver);
751 module_init(mt9m001_mod_init);
752 module_exit(mt9m001_mod_exit);
754 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
755 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
756 MODULE_LICENSE("GPL");