| /* |
| * Driver for MT9M001 CMOS Image Sensor from Micron |
| * |
| * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/videodev2.h> |
| #include <linux/slab.h> |
| #include <linux/i2c.h> |
| #include <linux/log2.h> |
| |
| #include <media/v4l2-common.h> |
| #include <media/v4l2-chip-ident.h> |
| #include <media/soc_camera.h> |
| |
| #ifdef CONFIG_MT9M001_PCA9536_SWITCH |
| #include <asm/gpio.h> |
| #endif |
| |
| /* mt9m001 i2c address 0x5d |
| * The platform has to define i2c_board_info |
| * and call i2c_register_board_info() */ |
| |
| /* mt9m001 selected register addresses */ |
| #define MT9M001_CHIP_VERSION 0x00 |
| #define MT9M001_ROW_START 0x01 |
| #define MT9M001_COLUMN_START 0x02 |
| #define MT9M001_WINDOW_HEIGHT 0x03 |
| #define MT9M001_WINDOW_WIDTH 0x04 |
| #define MT9M001_HORIZONTAL_BLANKING 0x05 |
| #define MT9M001_VERTICAL_BLANKING 0x06 |
| #define MT9M001_OUTPUT_CONTROL 0x07 |
| #define MT9M001_SHUTTER_WIDTH 0x09 |
| #define MT9M001_FRAME_RESTART 0x0b |
| #define MT9M001_SHUTTER_DELAY 0x0c |
| #define MT9M001_RESET 0x0d |
| #define MT9M001_READ_OPTIONS1 0x1e |
| #define MT9M001_READ_OPTIONS2 0x20 |
| #define MT9M001_GLOBAL_GAIN 0x35 |
| #define MT9M001_CHIP_ENABLE 0xF1 |
| |
| static const struct soc_camera_data_format mt9m001_colour_formats[] = { |
| /* Order important: first natively supported, |
| * second supported with a GPIO extender */ |
| { |
| .name = "Bayer (sRGB) 10 bit", |
| .depth = 10, |
| .fourcc = V4L2_PIX_FMT_SBGGR16, |
| .colorspace = V4L2_COLORSPACE_SRGB, |
| }, { |
| .name = "Bayer (sRGB) 8 bit", |
| .depth = 8, |
| .fourcc = V4L2_PIX_FMT_SBGGR8, |
| .colorspace = V4L2_COLORSPACE_SRGB, |
| } |
| }; |
| |
| static const struct soc_camera_data_format mt9m001_monochrome_formats[] = { |
| /* Order important - see above */ |
| { |
| .name = "Monochrome 10 bit", |
| .depth = 10, |
| .fourcc = V4L2_PIX_FMT_Y16, |
| }, { |
| .name = "Monochrome 8 bit", |
| .depth = 8, |
| .fourcc = V4L2_PIX_FMT_GREY, |
| }, |
| }; |
| |
| struct mt9m001 { |
| struct i2c_client *client; |
| struct soc_camera_device icd; |
| int model; /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */ |
| int switch_gpio; |
| unsigned char autoexposure; |
| unsigned char datawidth; |
| }; |
| |
| static int reg_read(struct soc_camera_device *icd, const u8 reg) |
| { |
| struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); |
| struct i2c_client *client = mt9m001->client; |
| s32 data = i2c_smbus_read_word_data(client, reg); |
| return data < 0 ? data : swab16(data); |
| } |
| |
| static int reg_write(struct soc_camera_device *icd, const u8 reg, |
| const u16 data) |
| { |
| struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); |
| return i2c_smbus_write_word_data(mt9m001->client, reg, swab16(data)); |
| } |
| |
| static int reg_set(struct soc_camera_device *icd, const u8 reg, |
| const u16 data) |
| { |
| int ret; |
| |
| ret = reg_read(icd, reg); |
| if (ret < 0) |
| return ret; |
| return reg_write(icd, reg, ret | data); |
| } |
| |
| static int reg_clear(struct soc_camera_device *icd, const u8 reg, |
| const u16 data) |
| { |
| int ret; |
| |
| ret = reg_read(icd, reg); |
| if (ret < 0) |
| return ret; |
| return reg_write(icd, reg, ret & ~data); |
| } |
| |
| static int mt9m001_init(struct soc_camera_device *icd) |
| { |
| int ret; |
| |
| /* Disable chip, synchronous option update */ |
| dev_dbg(icd->vdev->dev, "%s\n", __FUNCTION__); |
| |
| ret = reg_write(icd, MT9M001_RESET, 1); |
| if (ret >= 0) |
| ret = reg_write(icd, MT9M001_RESET, 0); |
| if (ret >= 0) |
| ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0); |
| |
| return ret >= 0 ? 0 : -EIO; |
| } |
| |
| static int mt9m001_release(struct soc_camera_device *icd) |
| { |
| /* Disable the chip */ |
| reg_write(icd, MT9M001_OUTPUT_CONTROL, 0); |
| return 0; |
| } |
| |
| static int mt9m001_start_capture(struct soc_camera_device *icd) |
| { |
| /* Switch to master "normal" mode */ |
| if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0) |
| return -EIO; |
| return 0; |
| } |
| |
| static int mt9m001_stop_capture(struct soc_camera_device *icd) |
| { |
| /* Stop sensor readout */ |
| if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0) |
| return -EIO; |
| return 0; |
| } |
| |
| static int bus_switch_request(struct mt9m001 *mt9m001, |
| struct soc_camera_link *icl) |
| { |
| #ifdef CONFIG_MT9M001_PCA9536_SWITCH |
| int ret; |
| unsigned int gpio = icl->gpio; |
| |
| if (gpio_is_valid(gpio)) { |
| /* We have a data bus switch. */ |
| ret = gpio_request(gpio, "mt9m001"); |
| if (ret < 0) { |
| dev_err(&mt9m001->client->dev, "Cannot get GPIO %u\n", |
| gpio); |
| return ret; |
| } |
| |
| ret = gpio_direction_output(gpio, 0); |
| if (ret < 0) { |
| dev_err(&mt9m001->client->dev, |
| "Cannot set GPIO %u to output\n", gpio); |
| gpio_free(gpio); |
| return ret; |
| } |
| } |
| |
| mt9m001->switch_gpio = gpio; |
| #else |
| mt9m001->switch_gpio = -EINVAL; |
| #endif |
| return 0; |
| } |
| |
| static void bus_switch_release(struct mt9m001 *mt9m001) |
| { |
| #ifdef CONFIG_MT9M001_PCA9536_SWITCH |
| if (gpio_is_valid(mt9m001->switch_gpio)) |
| gpio_free(mt9m001->switch_gpio); |
| #endif |
| } |
| |
| static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit) |
| { |
| #ifdef CONFIG_MT9M001_PCA9536_SWITCH |
| if (!gpio_is_valid(mt9m001->switch_gpio)) |
| return -ENODEV; |
| |
| gpio_set_value_cansleep(mt9m001->switch_gpio, go8bit); |
| return 0; |
| #else |
| return -ENODEV; |
| #endif |
| } |
| |
| static int bus_switch_possible(struct mt9m001 *mt9m001) |
| { |
| #ifdef CONFIG_MT9M001_PCA9536_SWITCH |
| return gpio_is_valid(mt9m001->switch_gpio); |
| #else |
| return 0; |
| #endif |
| } |
| |
| static int mt9m001_set_bus_param(struct soc_camera_device *icd, |
| unsigned long flags) |
| { |
| struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); |
| unsigned int width_flag = flags & SOCAM_DATAWIDTH_MASK; |
| int ret; |
| |
| /* Flags validity verified in test_bus_param */ |
| |
| if ((mt9m001->datawidth != 10 && (width_flag == SOCAM_DATAWIDTH_10)) || |
| (mt9m001->datawidth != 9 && (width_flag == SOCAM_DATAWIDTH_9)) || |
| (mt9m001->datawidth != 8 && (width_flag == SOCAM_DATAWIDTH_8))) { |
| /* Well, we actually only can do 10 or 8 bits... */ |
| if (width_flag == SOCAM_DATAWIDTH_9) |
| return -EINVAL; |
| ret = bus_switch_act(mt9m001, |
| width_flag == SOCAM_DATAWIDTH_8); |
| if (ret < 0) |
| return ret; |
| |
| mt9m001->datawidth = width_flag == SOCAM_DATAWIDTH_8 ? 8 : 10; |
| } |
| |
| return 0; |
| } |
| |
| static unsigned long mt9m001_query_bus_param(struct soc_camera_device *icd) |
| { |
| struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); |
| unsigned int width_flag = SOCAM_DATAWIDTH_10; |
| |
| if (bus_switch_possible(mt9m001)) |
| width_flag |= SOCAM_DATAWIDTH_8; |
| |
| /* MT9M001 has all capture_format parameters fixed */ |
| return SOCAM_PCLK_SAMPLE_RISING | |
| SOCAM_HSYNC_ACTIVE_HIGH | |
| SOCAM_VSYNC_ACTIVE_HIGH | |
| SOCAM_MASTER | |
| width_flag; |
| } |
| |
| static int mt9m001_set_fmt_cap(struct soc_camera_device *icd, |
| __u32 pixfmt, struct v4l2_rect *rect) |
| { |
| struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); |
| int ret; |
| const u16 hblank = 9, vblank = 25; |
| |
| /* Blanking and start values - default... */ |
| ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank); |
| if (ret >= 0) |
| ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank); |
| |
| /* The caller provides a supported format, as verified per |
| * call to icd->try_fmt_cap() */ |
| if (ret >= 0) |
| ret = reg_write(icd, MT9M001_COLUMN_START, rect->left); |
| if (ret >= 0) |
| ret = reg_write(icd, MT9M001_ROW_START, rect->top); |
| if (ret >= 0) |
| ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1); |
| if (ret >= 0) |
| ret = reg_write(icd, MT9M001_WINDOW_HEIGHT, |
| rect->height + icd->y_skip_top - 1); |
| if (ret >= 0 && mt9m001->autoexposure) { |
| ret = reg_write(icd, MT9M001_SHUTTER_WIDTH, |
| rect->height + icd->y_skip_top + vblank); |
| if (ret >= 0) { |
| const struct v4l2_queryctrl *qctrl = |
| soc_camera_find_qctrl(icd->ops, |
| V4L2_CID_EXPOSURE); |
| icd->exposure = (524 + (rect->height + icd->y_skip_top + |
| vblank - 1) * |
| (qctrl->maximum - qctrl->minimum)) / |
| 1048 + qctrl->minimum; |
| } |
| } |
| |
| return ret < 0 ? ret : 0; |
| } |
| |
| static int mt9m001_try_fmt_cap(struct soc_camera_device *icd, |
| struct v4l2_format *f) |
| { |
| if (f->fmt.pix.height < 32 + icd->y_skip_top) |
| f->fmt.pix.height = 32 + icd->y_skip_top; |
| if (f->fmt.pix.height > 1024 + icd->y_skip_top) |
| f->fmt.pix.height = 1024 + icd->y_skip_top; |
| if (f->fmt.pix.width < 48) |
| f->fmt.pix.width = 48; |
| if (f->fmt.pix.width > 1280) |
| f->fmt.pix.width = 1280; |
| f->fmt.pix.width &= ~0x01; /* has to be even, unsure why was ~3 */ |
| |
| return 0; |
| } |
| |
| static int mt9m001_get_chip_id(struct soc_camera_device *icd, |
| struct v4l2_chip_ident *id) |
| { |
| struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); |
| |
| if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR) |
| return -EINVAL; |
| |
| if (id->match_chip != mt9m001->client->addr) |
| return -ENODEV; |
| |
| id->ident = mt9m001->model; |
| id->revision = 0; |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_VIDEO_ADV_DEBUG |
| static int mt9m001_get_register(struct soc_camera_device *icd, |
| struct v4l2_register *reg) |
| { |
| struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); |
| |
| if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) |
| return -EINVAL; |
| |
| if (reg->match_chip != mt9m001->client->addr) |
| return -ENODEV; |
| |
| reg->val = reg_read(icd, reg->reg); |
| |
| if (reg->val > 0xffff) |
| return -EIO; |
| |
| return 0; |
| } |
| |
| static int mt9m001_set_register(struct soc_camera_device *icd, |
| struct v4l2_register *reg) |
| { |
| struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); |
| |
| if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) |
| return -EINVAL; |
| |
| if (reg->match_chip != mt9m001->client->addr) |
| return -ENODEV; |
| |
| if (reg_write(icd, reg->reg, reg->val) < 0) |
| return -EIO; |
| |
| return 0; |
| } |
| #endif |
| |
| const struct v4l2_queryctrl mt9m001_controls[] = { |
| { |
| .id = V4L2_CID_VFLIP, |
| .type = V4L2_CTRL_TYPE_BOOLEAN, |
| .name = "Flip Vertically", |
| .minimum = 0, |
| .maximum = 1, |
| .step = 1, |
| .default_value = 0, |
| }, { |
| .id = V4L2_CID_GAIN, |
| .type = V4L2_CTRL_TYPE_INTEGER, |
| .name = "Gain", |
| .minimum = 0, |
| .maximum = 127, |
| .step = 1, |
| .default_value = 64, |
| .flags = V4L2_CTRL_FLAG_SLIDER, |
| }, { |
| .id = V4L2_CID_EXPOSURE, |
| .type = V4L2_CTRL_TYPE_INTEGER, |
| .name = "Exposure", |
| .minimum = 1, |
| .maximum = 255, |
| .step = 1, |
| .default_value = 255, |
| .flags = V4L2_CTRL_FLAG_SLIDER, |
| }, { |
| .id = V4L2_CID_EXPOSURE_AUTO, |
| .type = V4L2_CTRL_TYPE_BOOLEAN, |
| .name = "Automatic Exposure", |
| .minimum = 0, |
| .maximum = 1, |
| .step = 1, |
| .default_value = 1, |
| } |
| }; |
| |
| static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl); |
| static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl); |
| |
| static struct soc_camera_ops mt9m001_ops = { |
| .owner = THIS_MODULE, |
| .init = mt9m001_init, |
| .release = mt9m001_release, |
| .start_capture = mt9m001_start_capture, |
| .stop_capture = mt9m001_stop_capture, |
| .set_fmt_cap = mt9m001_set_fmt_cap, |
| .try_fmt_cap = mt9m001_try_fmt_cap, |
| .set_bus_param = mt9m001_set_bus_param, |
| .query_bus_param = mt9m001_query_bus_param, |
| .formats = NULL, /* Filled in later depending on the */ |
| .num_formats = 0, /* camera type and data widths */ |
| .controls = mt9m001_controls, |
| .num_controls = ARRAY_SIZE(mt9m001_controls), |
| .get_control = mt9m001_get_control, |
| .set_control = mt9m001_set_control, |
| .get_chip_id = mt9m001_get_chip_id, |
| #ifdef CONFIG_VIDEO_ADV_DEBUG |
| .get_register = mt9m001_get_register, |
| .set_register = mt9m001_set_register, |
| #endif |
| }; |
| |
| static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl) |
| { |
| struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); |
| int data; |
| |
| switch (ctrl->id) { |
| case V4L2_CID_VFLIP: |
| data = reg_read(icd, MT9M001_READ_OPTIONS2); |
| if (data < 0) |
| return -EIO; |
| ctrl->value = !!(data & 0x8000); |
| break; |
| case V4L2_CID_EXPOSURE_AUTO: |
| ctrl->value = mt9m001->autoexposure; |
| break; |
| } |
| return 0; |
| } |
| |
| static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl) |
| { |
| struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); |
| const struct v4l2_queryctrl *qctrl; |
| int data; |
| |
| qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id); |
| |
| if (!qctrl) |
| return -EINVAL; |
| |
| switch (ctrl->id) { |
| case V4L2_CID_VFLIP: |
| if (ctrl->value) |
| data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000); |
| else |
| data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000); |
| if (data < 0) |
| return -EIO; |
| break; |
| case V4L2_CID_GAIN: |
| if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum) |
| return -EINVAL; |
| /* See Datasheet Table 7, Gain settings. */ |
| if (ctrl->value <= qctrl->default_value) { |
| /* Pack it into 0..1 step 0.125, register values 0..8 */ |
| unsigned long range = qctrl->default_value - qctrl->minimum; |
| data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range; |
| |
| dev_dbg(&icd->dev, "Setting gain %d\n", data); |
| data = reg_write(icd, MT9M001_GLOBAL_GAIN, data); |
| if (data < 0) |
| return -EIO; |
| } else { |
| /* Pack it into 1.125..15 variable step, register values 9..67 */ |
| /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */ |
| unsigned long range = qctrl->maximum - qctrl->default_value - 1; |
| unsigned long gain = ((ctrl->value - qctrl->default_value - 1) * |
| 111 + range / 2) / range + 9; |
| |
| if (gain <= 32) |
| data = gain; |
| else if (gain <= 64) |
| data = ((gain - 32) * 16 + 16) / 32 + 80; |
| else |
| data = ((gain - 64) * 7 + 28) / 56 + 96; |
| |
| dev_dbg(&icd->dev, "Setting gain from %d to %d\n", |
| reg_read(icd, MT9M001_GLOBAL_GAIN), data); |
| data = reg_write(icd, MT9M001_GLOBAL_GAIN, data); |
| if (data < 0) |
| return -EIO; |
| } |
| |
| /* Success */ |
| icd->gain = ctrl->value; |
| break; |
| case V4L2_CID_EXPOSURE: |
| /* mt9m001 has maximum == default */ |
| if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum) |
| return -EINVAL; |
| else { |
| unsigned long range = qctrl->maximum - qctrl->minimum; |
| unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 + |
| range / 2) / range + 1; |
| |
| dev_dbg(&icd->dev, "Setting shutter width from %d to %lu\n", |
| reg_read(icd, MT9M001_SHUTTER_WIDTH), shutter); |
| if (reg_write(icd, MT9M001_SHUTTER_WIDTH, shutter) < 0) |
| return -EIO; |
| icd->exposure = ctrl->value; |
| mt9m001->autoexposure = 0; |
| } |
| break; |
| case V4L2_CID_EXPOSURE_AUTO: |
| if (ctrl->value) { |
| const u16 vblank = 25; |
| if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height + |
| icd->y_skip_top + vblank) < 0) |
| return -EIO; |
| qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE); |
| icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) * |
| (qctrl->maximum - qctrl->minimum)) / |
| 1048 + qctrl->minimum; |
| mt9m001->autoexposure = 1; |
| } else |
| mt9m001->autoexposure = 0; |
| break; |
| } |
| return 0; |
| } |
| |
| /* Interface active, can use i2c. If it fails, it can indeed mean, that |
| * this wasn't our capture interface, so, we wait for the right one */ |
| static int mt9m001_video_probe(struct soc_camera_device *icd) |
| { |
| struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); |
| s32 data; |
| int ret; |
| |
| /* We must have a parent by now. And it cannot be a wrong one. |
| * So this entire test is completely redundant. */ |
| if (!icd->dev.parent || |
| to_soc_camera_host(icd->dev.parent)->nr != icd->iface) |
| return -ENODEV; |
| |
| /* Enable the chip */ |
| data = reg_write(&mt9m001->icd, MT9M001_CHIP_ENABLE, 1); |
| dev_dbg(&icd->dev, "write: %d\n", data); |
| |
| /* Read out the chip version register */ |
| data = reg_read(icd, MT9M001_CHIP_VERSION); |
| |
| /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */ |
| switch (data) { |
| case 0x8411: |
| case 0x8421: |
| mt9m001->model = V4L2_IDENT_MT9M001C12ST; |
| mt9m001_ops.formats = mt9m001_colour_formats; |
| if (mt9m001->client->dev.platform_data) |
| mt9m001_ops.num_formats = ARRAY_SIZE(mt9m001_colour_formats); |
| else |
| mt9m001_ops.num_formats = 1; |
| break; |
| case 0x8431: |
| mt9m001->model = V4L2_IDENT_MT9M001C12STM; |
| mt9m001_ops.formats = mt9m001_monochrome_formats; |
| if (mt9m001->client->dev.platform_data) |
| mt9m001_ops.num_formats = ARRAY_SIZE(mt9m001_monochrome_formats); |
| else |
| mt9m001_ops.num_formats = 1; |
| break; |
| default: |
| ret = -ENODEV; |
| dev_err(&icd->dev, |
| "No MT9M001 chip detected, register read %x\n", data); |
| goto ei2c; |
| } |
| |
| dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data, |
| data == 0x8431 ? "C12STM" : "C12ST"); |
| |
| /* Now that we know the model, we can start video */ |
| ret = soc_camera_video_start(icd); |
| if (ret) |
| goto eisis; |
| |
| return 0; |
| |
| eisis: |
| ei2c: |
| return ret; |
| } |
| |
| static void mt9m001_video_remove(struct soc_camera_device *icd) |
| { |
| struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd); |
| |
| dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr, |
| mt9m001->icd.dev.parent, mt9m001->icd.vdev); |
| soc_camera_video_stop(&mt9m001->icd); |
| } |
| |
| static int mt9m001_probe(struct i2c_client *client) |
| { |
| struct mt9m001 *mt9m001; |
| struct soc_camera_device *icd; |
| struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); |
| struct soc_camera_link *icl = client->dev.platform_data; |
| int ret; |
| |
| if (!icl) { |
| dev_err(&client->dev, "MT9M001 driver needs platform data\n"); |
| return -EINVAL; |
| } |
| |
| if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) { |
| dev_warn(&adapter->dev, |
| "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n"); |
| return -EIO; |
| } |
| |
| mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL); |
| if (!mt9m001) |
| return -ENOMEM; |
| |
| mt9m001->client = client; |
| i2c_set_clientdata(client, mt9m001); |
| |
| /* Second stage probe - when a capture adapter is there */ |
| icd = &mt9m001->icd; |
| icd->probe = mt9m001_video_probe; |
| icd->remove = mt9m001_video_remove; |
| icd->ops = &mt9m001_ops; |
| icd->control = &client->dev; |
| icd->x_min = 20; |
| icd->y_min = 12; |
| icd->x_current = 20; |
| icd->y_current = 12; |
| icd->width_min = 48; |
| icd->width_max = 1280; |
| icd->height_min = 32; |
| icd->height_max = 1024; |
| icd->y_skip_top = 1; |
| icd->iface = icl->bus_id; |
| /* Default datawidth - this is the only width this camera (normally) |
| * supports. It is only with extra logic that it can support |
| * other widths. Therefore it seems to be a sensible default. */ |
| mt9m001->datawidth = 10; |
| /* Simulated autoexposure. If enabled, we calculate shutter width |
| * ourselves in the driver based on vertical blanking and frame width */ |
| mt9m001->autoexposure = 1; |
| |
| ret = bus_switch_request(mt9m001, icl); |
| if (ret) |
| goto eswinit; |
| |
| ret = soc_camera_device_register(icd); |
| if (ret) |
| goto eisdr; |
| |
| return 0; |
| |
| eisdr: |
| bus_switch_release(mt9m001); |
| eswinit: |
| kfree(mt9m001); |
| return ret; |
| } |
| |
| static int mt9m001_remove(struct i2c_client *client) |
| { |
| struct mt9m001 *mt9m001 = i2c_get_clientdata(client); |
| |
| soc_camera_device_unregister(&mt9m001->icd); |
| bus_switch_release(mt9m001); |
| kfree(mt9m001); |
| |
| return 0; |
| } |
| |
| static struct i2c_driver mt9m001_i2c_driver = { |
| .driver = { |
| .name = "mt9m001", |
| }, |
| .probe = mt9m001_probe, |
| .remove = mt9m001_remove, |
| }; |
| |
| static int __init mt9m001_mod_init(void) |
| { |
| return i2c_add_driver(&mt9m001_i2c_driver); |
| } |
| |
| static void __exit mt9m001_mod_exit(void) |
| { |
| i2c_del_driver(&mt9m001_i2c_driver); |
| } |
| |
| module_init(mt9m001_mod_init); |
| module_exit(mt9m001_mod_exit); |
| |
| MODULE_DESCRIPTION("Micron MT9M001 Camera driver"); |
| MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>"); |
| MODULE_LICENSE("GPL"); |