/* * Driver for MT9V022 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/delay.h> #include <linux/log2.h> #include <media/v4l2-subdev.h> #include <media/v4l2-chip-ident.h> #include <media/soc_camera.h> /* mt9v022 i2c address 0x48, 0x4c, 0x58, 0x5c * The platform has to define ctruct i2c_board_info objects and link to them * from struct soc_camera_link */ static char *sensor_type; module_param(sensor_type, charp, S_IRUGO); MODULE_PARM_DESC(sensor_type, "Sensor type: \"colour\" or \"monochrome\""); /* mt9v022 selected register addresses */ #define MT9V022_CHIP_VERSION 0x00 #define MT9V022_COLUMN_START 0x01 #define MT9V022_ROW_START 0x02 #define MT9V022_WINDOW_HEIGHT 0x03 #define MT9V022_WINDOW_WIDTH 0x04 #define MT9V022_HORIZONTAL_BLANKING 0x05 #define MT9V022_VERTICAL_BLANKING 0x06 #define MT9V022_CHIP_CONTROL 0x07 #define MT9V022_SHUTTER_WIDTH1 0x08 #define MT9V022_SHUTTER_WIDTH2 0x09 #define MT9V022_SHUTTER_WIDTH_CTRL 0x0a #define MT9V022_TOTAL_SHUTTER_WIDTH 0x0b #define MT9V022_RESET 0x0c #define MT9V022_READ_MODE 0x0d #define MT9V022_MONITOR_MODE 0x0e #define MT9V022_PIXEL_OPERATION_MODE 0x0f #define MT9V022_LED_OUT_CONTROL 0x1b #define MT9V022_ADC_MODE_CONTROL 0x1c #define MT9V022_ANALOG_GAIN 0x34 #define MT9V022_BLACK_LEVEL_CALIB_CTRL 0x47 #define MT9V022_PIXCLK_FV_LV 0x74 #define MT9V022_DIGITAL_TEST_PATTERN 0x7f #define MT9V022_AEC_AGC_ENABLE 0xAF #define MT9V022_MAX_TOTAL_SHUTTER_WIDTH 0xBD /* Progressive scan, master, defaults */ #define MT9V022_CHIP_CONTROL_DEFAULT 0x188 static const struct soc_camera_data_format mt9v022_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 mt9v022_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 mt9v022 { struct v4l2_subdev subdev; int model; /* V4L2_IDENT_MT9V022* codes from v4l2-chip-ident.h */ u16 chip_control; }; static struct mt9v022 *to_mt9v022(const struct i2c_client *client) { return container_of(i2c_get_clientdata(client), struct mt9v022, subdev); } static int reg_read(struct i2c_client *client, const u8 reg) { s32 data = i2c_smbus_read_word_data(client, reg); return data < 0 ? data : swab16(data); } static int reg_write(struct i2c_client *client, const u8 reg, const u16 data) { return i2c_smbus_write_word_data(client, reg, swab16(data)); } static int reg_set(struct i2c_client *client, const u8 reg, const u16 data) { int ret; ret = reg_read(client, reg); if (ret < 0) return ret; return reg_write(client, reg, ret | data); } static int reg_clear(struct i2c_client *client, const u8 reg, const u16 data) { int ret; ret = reg_read(client, reg); if (ret < 0) return ret; return reg_write(client, reg, ret & ~data); } static int mt9v022_init(struct soc_camera_device *icd) { struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd)); struct mt9v022 *mt9v022 = to_mt9v022(client); int ret; /* Almost the default mode: master, parallel, simultaneous, and an * undocumented bit 0x200, which is present in table 7, but not in 8, * plus snapshot mode to disable scan for now */ mt9v022->chip_control |= 0x10; ret = reg_write(client, MT9V022_CHIP_CONTROL, mt9v022->chip_control); if (!ret) ret = reg_write(client, MT9V022_READ_MODE, 0x300); /* All defaults */ if (!ret) /* AEC, AGC on */ ret = reg_set(client, MT9V022_AEC_AGC_ENABLE, 0x3); if (!ret) ret = reg_write(client, MT9V022_MAX_TOTAL_SHUTTER_WIDTH, 480); if (!ret) /* default - auto */ ret = reg_clear(client, MT9V022_BLACK_LEVEL_CALIB_CTRL, 1); if (!ret) ret = reg_write(client, MT9V022_DIGITAL_TEST_PATTERN, 0); return ret; } static int mt9v022_s_stream(struct v4l2_subdev *sd, int enable) { struct i2c_client *client = sd->priv; struct mt9v022 *mt9v022 = to_mt9v022(client); if (enable) /* Switch to master "normal" mode */ mt9v022->chip_control &= ~0x10; else /* Switch to snapshot mode */ mt9v022->chip_control |= 0x10; if (reg_write(client, MT9V022_CHIP_CONTROL, mt9v022->chip_control) < 0) return -EIO; return 0; } static int mt9v022_set_bus_param(struct soc_camera_device *icd, unsigned long flags) { struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd)); struct mt9v022 *mt9v022 = to_mt9v022(client); struct soc_camera_link *icl = to_soc_camera_link(icd); unsigned int width_flag = flags & SOCAM_DATAWIDTH_MASK; int ret; u16 pixclk = 0; /* Only one width bit may be set */ if (!is_power_of_2(width_flag)) return -EINVAL; if (icl->set_bus_param) { ret = icl->set_bus_param(icl, width_flag); if (ret) return ret; } else { /* * Without board specific bus width settings we only support the * sensors native bus width */ if (width_flag != SOCAM_DATAWIDTH_10) return -EINVAL; } flags = soc_camera_apply_sensor_flags(icl, flags); if (flags & SOCAM_PCLK_SAMPLE_RISING) pixclk |= 0x10; if (!(flags & SOCAM_HSYNC_ACTIVE_HIGH)) pixclk |= 0x1; if (!(flags & SOCAM_VSYNC_ACTIVE_HIGH)) pixclk |= 0x2; ret = reg_write(client, MT9V022_PIXCLK_FV_LV, pixclk); if (ret < 0) return ret; if (!(flags & SOCAM_MASTER)) mt9v022->chip_control &= ~0x8; ret = reg_write(client, MT9V022_CHIP_CONTROL, mt9v022->chip_control); if (ret < 0) return ret; dev_dbg(&icd->dev, "Calculated pixclk 0x%x, chip control 0x%x\n", pixclk, mt9v022->chip_control); return 0; } static unsigned long mt9v022_query_bus_param(struct soc_camera_device *icd) { struct soc_camera_link *icl = to_soc_camera_link(icd); unsigned int width_flag; if (icl->query_bus_param) width_flag = icl->query_bus_param(icl) & SOCAM_DATAWIDTH_MASK; else width_flag = SOCAM_DATAWIDTH_10; return SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING | SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW | SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW | SOCAM_DATA_ACTIVE_HIGH | SOCAM_MASTER | SOCAM_SLAVE | width_flag; } static int mt9v022_set_crop(struct soc_camera_device *icd, struct v4l2_rect *rect) { struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd)); int ret; /* Like in example app. Contradicts the datasheet though */ ret = reg_read(client, MT9V022_AEC_AGC_ENABLE); if (ret >= 0) { if (ret & 1) /* Autoexposure */ ret = reg_write(client, MT9V022_MAX_TOTAL_SHUTTER_WIDTH, rect->height + icd->y_skip_top + 43); else ret = reg_write(client, MT9V022_TOTAL_SHUTTER_WIDTH, rect->height + icd->y_skip_top + 43); } /* Setup frame format: defaults apart from width and height */ if (!ret) ret = reg_write(client, MT9V022_COLUMN_START, rect->left); if (!ret) ret = reg_write(client, MT9V022_ROW_START, rect->top); if (!ret) /* Default 94, Phytec driver says: * "width + horizontal blank >= 660" */ ret = reg_write(client, MT9V022_HORIZONTAL_BLANKING, rect->width > 660 - 43 ? 43 : 660 - rect->width); if (!ret) ret = reg_write(client, MT9V022_VERTICAL_BLANKING, 45); if (!ret) ret = reg_write(client, MT9V022_WINDOW_WIDTH, rect->width); if (!ret) ret = reg_write(client, MT9V022_WINDOW_HEIGHT, rect->height + icd->y_skip_top); if (ret < 0) return ret; dev_dbg(&icd->dev, "Frame %ux%u pixel\n", rect->width, rect->height); return 0; } static int mt9v022_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *f) { struct i2c_client *client = sd->priv; struct mt9v022 *mt9v022 = to_mt9v022(client); struct soc_camera_device *icd = client->dev.platform_data; struct v4l2_pix_format *pix = &f->fmt.pix; struct v4l2_rect rect = { .left = icd->rect_current.left, .top = icd->rect_current.top, .width = pix->width, .height = pix->height, }; /* The caller provides a supported format, as verified per call to * icd->try_fmt(), datawidth is from our supported format list */ switch (pix->pixelformat) { case V4L2_PIX_FMT_GREY: case V4L2_PIX_FMT_Y16: if (mt9v022->model != V4L2_IDENT_MT9V022IX7ATM) return -EINVAL; break; case V4L2_PIX_FMT_SBGGR8: case V4L2_PIX_FMT_SBGGR16: if (mt9v022->model != V4L2_IDENT_MT9V022IX7ATC) return -EINVAL; break; case 0: /* No format change, only geometry */ break; default: return -EINVAL; } /* No support for scaling on this camera, just crop. */ return mt9v022_set_crop(icd, &rect); } static int mt9v022_try_fmt(struct v4l2_subdev *sd, struct v4l2_format *f) { struct i2c_client *client = sd->priv; struct soc_camera_device *icd = client->dev.platform_data; struct v4l2_pix_format *pix = &f->fmt.pix; v4l_bound_align_image(&pix->width, 48, 752, 2 /* ? */, &pix->height, 32 + icd->y_skip_top, 480 + icd->y_skip_top, 0, 0); return 0; } static int mt9v022_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *id) { struct i2c_client *client = sd->priv; struct mt9v022 *mt9v022 = to_mt9v022(client); if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR) return -EINVAL; if (id->match.addr != client->addr) return -ENODEV; id->ident = mt9v022->model; id->revision = 0; return 0; } #ifdef CONFIG_VIDEO_ADV_DEBUG static int mt9v022_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) { struct i2c_client *client = sd->priv; if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) return -EINVAL; if (reg->match.addr != client->addr) return -ENODEV; reg->size = 2; reg->val = reg_read(client, reg->reg); if (reg->val > 0xffff) return -EIO; return 0; } static int mt9v022_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) { struct i2c_client *client = sd->priv; if (reg->match.type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff) return -EINVAL; if (reg->match.addr != client->addr) return -ENODEV; if (reg_write(client, reg->reg, reg->val) < 0) return -EIO; return 0; } #endif static const struct v4l2_queryctrl mt9v022_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_HFLIP, .type = V4L2_CTRL_TYPE_BOOLEAN, .name = "Flip Horizontally", .minimum = 0, .maximum = 1, .step = 1, .default_value = 0, }, { .id = V4L2_CID_GAIN, .type = V4L2_CTRL_TYPE_INTEGER, .name = "Analog Gain", .minimum = 64, .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_AUTOGAIN, .type = V4L2_CTRL_TYPE_BOOLEAN, .name = "Automatic Gain", .minimum = 0, .maximum = 1, .step = 1, .default_value = 1, }, { .id = V4L2_CID_EXPOSURE_AUTO, .type = V4L2_CTRL_TYPE_BOOLEAN, .name = "Automatic Exposure", .minimum = 0, .maximum = 1, .step = 1, .default_value = 1, } }; static struct soc_camera_ops mt9v022_ops = { .init = mt9v022_init, .set_crop = mt9v022_set_crop, .set_bus_param = mt9v022_set_bus_param, .query_bus_param = mt9v022_query_bus_param, .controls = mt9v022_controls, .num_controls = ARRAY_SIZE(mt9v022_controls), }; static int mt9v022_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl) { struct i2c_client *client = sd->priv; int data; switch (ctrl->id) { case V4L2_CID_VFLIP: data = reg_read(client, MT9V022_READ_MODE); if (data < 0) return -EIO; ctrl->value = !!(data & 0x10); break; case V4L2_CID_HFLIP: data = reg_read(client, MT9V022_READ_MODE); if (data < 0) return -EIO; ctrl->value = !!(data & 0x20); break; case V4L2_CID_EXPOSURE_AUTO: data = reg_read(client, MT9V022_AEC_AGC_ENABLE); if (data < 0) return -EIO; ctrl->value = !!(data & 0x1); break; case V4L2_CID_AUTOGAIN: data = reg_read(client, MT9V022_AEC_AGC_ENABLE); if (data < 0) return -EIO; ctrl->value = !!(data & 0x2); break; } return 0; } static int mt9v022_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl) { int data; struct i2c_client *client = sd->priv; struct soc_camera_device *icd = client->dev.platform_data; const struct v4l2_queryctrl *qctrl; qctrl = soc_camera_find_qctrl(&mt9v022_ops, ctrl->id); if (!qctrl) return -EINVAL; switch (ctrl->id) { case V4L2_CID_VFLIP: if (ctrl->value) data = reg_set(client, MT9V022_READ_MODE, 0x10); else data = reg_clear(client, MT9V022_READ_MODE, 0x10); if (data < 0) return -EIO; break; case V4L2_CID_HFLIP: if (ctrl->value) data = reg_set(client, MT9V022_READ_MODE, 0x20); else data = reg_clear(client, MT9V022_READ_MODE, 0x20); if (data < 0) return -EIO; break; case V4L2_CID_GAIN: /* mt9v022 has minimum == default */ if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum) return -EINVAL; else { unsigned long range = qctrl->maximum - qctrl->minimum; /* Datasheet says 16 to 64. autogain only works properly * after setting gain to maximum 14. Larger values * produce "white fly" noise effect. On the whole, * manually setting analog gain does no good. */ unsigned long gain = ((ctrl->value - qctrl->minimum) * 10 + range / 2) / range + 4; if (gain >= 32) gain &= ~1; /* The user wants to set gain manually, hope, she * knows, what she's doing... Switch AGC off. */ if (reg_clear(client, MT9V022_AEC_AGC_ENABLE, 0x2) < 0) return -EIO; dev_info(&icd->dev, "Setting gain from %d to %lu\n", reg_read(client, MT9V022_ANALOG_GAIN), gain); if (reg_write(client, MT9V022_ANALOG_GAIN, gain) < 0) return -EIO; icd->gain = ctrl->value; } break; case V4L2_CID_EXPOSURE: /* mt9v022 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) * 479 + range / 2) / range + 1; /* The user wants to set shutter width manually, hope, * she knows, what she's doing... Switch AEC off. */ if (reg_clear(client, MT9V022_AEC_AGC_ENABLE, 0x1) < 0) return -EIO; dev_dbg(&icd->dev, "Shutter width from %d to %lu\n", reg_read(client, MT9V022_TOTAL_SHUTTER_WIDTH), shutter); if (reg_write(client, MT9V022_TOTAL_SHUTTER_WIDTH, shutter) < 0) return -EIO; icd->exposure = ctrl->value; } break; case V4L2_CID_AUTOGAIN: if (ctrl->value) data = reg_set(client, MT9V022_AEC_AGC_ENABLE, 0x2); else data = reg_clear(client, MT9V022_AEC_AGC_ENABLE, 0x2); if (data < 0) return -EIO; break; case V4L2_CID_EXPOSURE_AUTO: if (ctrl->value) data = reg_set(client, MT9V022_AEC_AGC_ENABLE, 0x1); else data = reg_clear(client, MT9V022_AEC_AGC_ENABLE, 0x1); if (data < 0) return -EIO; 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 mt9v022_video_probe(struct soc_camera_device *icd, struct i2c_client *client) { struct mt9v022 *mt9v022 = to_mt9v022(client); struct soc_camera_link *icl = to_soc_camera_link(icd); s32 data; int ret; unsigned long flags; if (!icd->dev.parent || to_soc_camera_host(icd->dev.parent)->nr != icd->iface) return -ENODEV; /* Read out the chip version register */ data = reg_read(client, MT9V022_CHIP_VERSION); /* must be 0x1311 or 0x1313 */ if (data != 0x1311 && data != 0x1313) { ret = -ENODEV; dev_info(&icd->dev, "No MT9V022 detected, ID register 0x%x\n", data); goto ei2c; } /* Soft reset */ ret = reg_write(client, MT9V022_RESET, 1); if (ret < 0) goto ei2c; /* 15 clock cycles */ udelay(200); if (reg_read(client, MT9V022_RESET)) { dev_err(&icd->dev, "Resetting MT9V022 failed!\n"); if (ret > 0) ret = -EIO; goto ei2c; } /* Set monochrome or colour sensor type */ if (sensor_type && (!strcmp("colour", sensor_type) || !strcmp("color", sensor_type))) { ret = reg_write(client, MT9V022_PIXEL_OPERATION_MODE, 4 | 0x11); mt9v022->model = V4L2_IDENT_MT9V022IX7ATC; icd->formats = mt9v022_colour_formats; } else { ret = reg_write(client, MT9V022_PIXEL_OPERATION_MODE, 0x11); mt9v022->model = V4L2_IDENT_MT9V022IX7ATM; icd->formats = mt9v022_monochrome_formats; } if (ret < 0) goto ei2c; icd->num_formats = 0; /* * This is a 10bit sensor, so by default we only allow 10bit. * The platform may support different bus widths due to * different routing of the data lines. */ if (icl->query_bus_param) flags = icl->query_bus_param(icl); else flags = SOCAM_DATAWIDTH_10; if (flags & SOCAM_DATAWIDTH_10) icd->num_formats++; else icd->formats++; if (flags & SOCAM_DATAWIDTH_8) icd->num_formats++; dev_info(&icd->dev, "Detected a MT9V022 chip ID %x, %s sensor\n", data, mt9v022->model == V4L2_IDENT_MT9V022IX7ATM ? "monochrome" : "colour"); ei2c: return ret; } static void mt9v022_video_remove(struct soc_camera_device *icd) { struct i2c_client *client = to_i2c_client(to_soc_camera_control(icd)); struct soc_camera_link *icl = to_soc_camera_link(icd); dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", client->addr, icd->dev.parent, icd->vdev); if (icl->free_bus) icl->free_bus(icl); } static struct v4l2_subdev_core_ops mt9v022_subdev_core_ops = { .g_ctrl = mt9v022_g_ctrl, .s_ctrl = mt9v022_s_ctrl, .g_chip_ident = mt9v022_g_chip_ident, #ifdef CONFIG_VIDEO_ADV_DEBUG .g_register = mt9v022_g_register, .s_register = mt9v022_s_register, #endif }; static struct v4l2_subdev_video_ops mt9v022_subdev_video_ops = { .s_stream = mt9v022_s_stream, .s_fmt = mt9v022_s_fmt, .try_fmt = mt9v022_try_fmt, }; static struct v4l2_subdev_ops mt9v022_subdev_ops = { .core = &mt9v022_subdev_core_ops, .video = &mt9v022_subdev_video_ops, }; static int mt9v022_probe(struct i2c_client *client, const struct i2c_device_id *did) { struct mt9v022 *mt9v022; struct soc_camera_device *icd = client->dev.platform_data; struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); struct soc_camera_link *icl; int ret; if (!icd) { dev_err(&client->dev, "MT9V022: missing soc-camera data!\n"); return -EINVAL; } icl = to_soc_camera_link(icd); if (!icl) { dev_err(&client->dev, "MT9V022 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; } mt9v022 = kzalloc(sizeof(struct mt9v022), GFP_KERNEL); if (!mt9v022) return -ENOMEM; v4l2_i2c_subdev_init(&mt9v022->subdev, client, &mt9v022_subdev_ops); mt9v022->chip_control = MT9V022_CHIP_CONTROL_DEFAULT; icd->ops = &mt9v022_ops; icd->rect_max.left = 1; icd->rect_max.top = 4; icd->rect_max.width = 752; icd->rect_max.height = 480; icd->rect_current.left = 1; icd->rect_current.top = 4; icd->width_min = 48; icd->height_min = 32; icd->y_skip_top = 1; ret = mt9v022_video_probe(icd, client); if (ret) { icd->ops = NULL; i2c_set_clientdata(client, NULL); kfree(mt9v022); } return ret; } static int mt9v022_remove(struct i2c_client *client) { struct mt9v022 *mt9v022 = to_mt9v022(client); struct soc_camera_device *icd = client->dev.platform_data; icd->ops = NULL; mt9v022_video_remove(icd); i2c_set_clientdata(client, NULL); client->driver = NULL; kfree(mt9v022); return 0; } static const struct i2c_device_id mt9v022_id[] = { { "mt9v022", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, mt9v022_id); static struct i2c_driver mt9v022_i2c_driver = { .driver = { .name = "mt9v022", }, .probe = mt9v022_probe, .remove = mt9v022_remove, .id_table = mt9v022_id, }; static int __init mt9v022_mod_init(void) { return i2c_add_driver(&mt9v022_i2c_driver); } static void __exit mt9v022_mod_exit(void) { i2c_del_driver(&mt9v022_i2c_driver); } module_init(mt9v022_mod_init); module_exit(mt9v022_mod_exit); MODULE_DESCRIPTION("Micron MT9V022 Camera driver"); MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>"); MODULE_LICENSE("GPL");