/* * Driver for MT9M001 CMOS Image Sensor from Micron * * Copyright (C) 2008, Guennadi Liakhovetski * * 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 #include #include #include #include #include #include #include #include /* * mt9m001 i2c address 0x5d * The platform has to define ctruct i2c_board_info objects and link to them * from struct soc_camera_link */ /* 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 #define MT9M001_MAX_WIDTH 1280 #define MT9M001_MAX_HEIGHT 1024 #define MT9M001_MIN_WIDTH 48 #define MT9M001_MIN_HEIGHT 32 #define MT9M001_COLUMN_SKIP 20 #define MT9M001_ROW_SKIP 12 /* MT9M001 has only one fixed colorspace per pixelcode */ struct mt9m001_datafmt { enum v4l2_mbus_pixelcode code; enum v4l2_colorspace colorspace; }; /* Find a data format by a pixel code in an array */ static const struct mt9m001_datafmt *mt9m001_find_datafmt( enum v4l2_mbus_pixelcode code, const struct mt9m001_datafmt *fmt, int n) { int i; for (i = 0; i < n; i++) if (fmt[i].code == code) return fmt + i; return NULL; } static const struct mt9m001_datafmt mt9m001_colour_fmts[] = { /* * Order important: first natively supported, * second supported with a GPIO extender */ {V4L2_MBUS_FMT_SBGGR10_1X10, V4L2_COLORSPACE_SRGB}, {V4L2_MBUS_FMT_SBGGR8_1X8, V4L2_COLORSPACE_SRGB}, }; static const struct mt9m001_datafmt mt9m001_monochrome_fmts[] = { /* Order important - see above */ {V4L2_MBUS_FMT_Y10_1X10, V4L2_COLORSPACE_JPEG}, {V4L2_MBUS_FMT_Y8_1X8, V4L2_COLORSPACE_JPEG}, }; struct mt9m001 { struct v4l2_subdev subdev; struct v4l2_ctrl_handler hdl; struct { /* exposure/auto-exposure cluster */ struct v4l2_ctrl *autoexposure; struct v4l2_ctrl *exposure; }; struct v4l2_rect rect; /* Sensor window */ const struct mt9m001_datafmt *fmt; const struct mt9m001_datafmt *fmts; int num_fmts; int model; /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */ unsigned int total_h; unsigned short y_skip_top; /* Lines to skip at the top */ }; static struct mt9m001 *to_mt9m001(const struct i2c_client *client) { return container_of(i2c_get_clientdata(client), struct mt9m001, subdev); } static int reg_read(struct i2c_client *client, const u8 reg) { return i2c_smbus_read_word_swapped(client, reg); } static int reg_write(struct i2c_client *client, const u8 reg, const u16 data) { return i2c_smbus_write_word_swapped(client, reg, 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 mt9m001_init(struct i2c_client *client) { int ret; dev_dbg(&client->dev, "%s\n", __func__); /* * We don't know, whether platform provides reset, issue a soft reset * too. This returns all registers to their default values. */ ret = reg_write(client, MT9M001_RESET, 1); if (!ret) ret = reg_write(client, MT9M001_RESET, 0); /* Disable chip, synchronous option update */ if (!ret) ret = reg_write(client, MT9M001_OUTPUT_CONTROL, 0); return ret; } static int mt9m001_s_stream(struct v4l2_subdev *sd, int enable) { struct i2c_client *client = v4l2_get_subdevdata(sd); /* Switch to master "normal" mode or stop sensor readout */ if (reg_write(client, MT9M001_OUTPUT_CONTROL, enable ? 2 : 0) < 0) return -EIO; return 0; } static int mt9m001_s_crop(struct v4l2_subdev *sd, struct v4l2_crop *a) { struct i2c_client *client = v4l2_get_subdevdata(sd); struct mt9m001 *mt9m001 = to_mt9m001(client); struct v4l2_rect rect = a->c; int ret; const u16 hblank = 9, vblank = 25; if (mt9m001->fmts == mt9m001_colour_fmts) /* * Bayer format - even number of rows for simplicity, * but let the user play with the top row. */ rect.height = ALIGN(rect.height, 2); /* Datasheet requirement: see register description */ rect.width = ALIGN(rect.width, 2); rect.left = ALIGN(rect.left, 2); soc_camera_limit_side(&rect.left, &rect.width, MT9M001_COLUMN_SKIP, MT9M001_MIN_WIDTH, MT9M001_MAX_WIDTH); soc_camera_limit_side(&rect.top, &rect.height, MT9M001_ROW_SKIP, MT9M001_MIN_HEIGHT, MT9M001_MAX_HEIGHT); mt9m001->total_h = rect.height + mt9m001->y_skip_top + vblank; /* Blanking and start values - default... */ ret = reg_write(client, MT9M001_HORIZONTAL_BLANKING, hblank); if (!ret) ret = reg_write(client, MT9M001_VERTICAL_BLANKING, vblank); /* * The caller provides a supported format, as verified per * call to .try_mbus_fmt() */ if (!ret) ret = reg_write(client, MT9M001_COLUMN_START, rect.left); if (!ret) ret = reg_write(client, MT9M001_ROW_START, rect.top); if (!ret) ret = reg_write(client, MT9M001_WINDOW_WIDTH, rect.width - 1); if (!ret) ret = reg_write(client, MT9M001_WINDOW_HEIGHT, rect.height + mt9m001->y_skip_top - 1); if (!ret && v4l2_ctrl_g_ctrl(mt9m001->autoexposure) == V4L2_EXPOSURE_AUTO) ret = reg_write(client, MT9M001_SHUTTER_WIDTH, mt9m001->total_h); if (!ret) mt9m001->rect = rect; return ret; } static int mt9m001_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a) { struct i2c_client *client = v4l2_get_subdevdata(sd); struct mt9m001 *mt9m001 = to_mt9m001(client); a->c = mt9m001->rect; a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; return 0; } static int mt9m001_cropcap(struct v4l2_subdev *sd, struct v4l2_cropcap *a) { a->bounds.left = MT9M001_COLUMN_SKIP; a->bounds.top = MT9M001_ROW_SKIP; a->bounds.width = MT9M001_MAX_WIDTH; a->bounds.height = MT9M001_MAX_HEIGHT; a->defrect = a->bounds; a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; a->pixelaspect.numerator = 1; a->pixelaspect.denominator = 1; return 0; } static int mt9m001_g_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *mf) { struct i2c_client *client = v4l2_get_subdevdata(sd); struct mt9m001 *mt9m001 = to_mt9m001(client); mf->width = mt9m001->rect.width; mf->height = mt9m001->rect.height; mf->code = mt9m001->fmt->code; mf->colorspace = mt9m001->fmt->colorspace; mf->field = V4L2_FIELD_NONE; return 0; } static int mt9m001_s_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *mf) { struct i2c_client *client = v4l2_get_subdevdata(sd); struct mt9m001 *mt9m001 = to_mt9m001(client); struct v4l2_crop a = { .c = { .left = mt9m001->rect.left, .top = mt9m001->rect.top, .width = mf->width, .height = mf->height, }, }; int ret; /* No support for scaling so far, just crop. TODO: use skipping */ ret = mt9m001_s_crop(sd, &a); if (!ret) { mf->width = mt9m001->rect.width; mf->height = mt9m001->rect.height; mt9m001->fmt = mt9m001_find_datafmt(mf->code, mt9m001->fmts, mt9m001->num_fmts); mf->colorspace = mt9m001->fmt->colorspace; } return ret; } static int mt9m001_try_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *mf) { struct i2c_client *client = v4l2_get_subdevdata(sd); struct mt9m001 *mt9m001 = to_mt9m001(client); const struct mt9m001_datafmt *fmt; v4l_bound_align_image(&mf->width, MT9M001_MIN_WIDTH, MT9M001_MAX_WIDTH, 1, &mf->height, MT9M001_MIN_HEIGHT + mt9m001->y_skip_top, MT9M001_MAX_HEIGHT + mt9m001->y_skip_top, 0, 0); if (mt9m001->fmts == mt9m001_colour_fmts) mf->height = ALIGN(mf->height - 1, 2); fmt = mt9m001_find_datafmt(mf->code, mt9m001->fmts, mt9m001->num_fmts); if (!fmt) { fmt = mt9m001->fmt; mf->code = fmt->code; } mf->colorspace = fmt->colorspace; return 0; } static int mt9m001_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *id) { struct i2c_client *client = v4l2_get_subdevdata(sd); struct mt9m001 *mt9m001 = to_mt9m001(client); if (id->match.type != V4L2_CHIP_MATCH_I2C_ADDR) return -EINVAL; if (id->match.addr != client->addr) return -ENODEV; id->ident = mt9m001->model; id->revision = 0; return 0; } #ifdef CONFIG_VIDEO_ADV_DEBUG static int mt9m001_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) { struct i2c_client *client = v4l2_get_subdevdata(sd); 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 mt9m001_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) { struct i2c_client *client = v4l2_get_subdevdata(sd); 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 int mt9m001_g_volatile_ctrl(struct v4l2_ctrl *ctrl) { struct mt9m001 *mt9m001 = container_of(ctrl->handler, struct mt9m001, hdl); s32 min, max; switch (ctrl->id) { case V4L2_CID_EXPOSURE_AUTO: min = mt9m001->exposure->minimum; max = mt9m001->exposure->maximum; mt9m001->exposure->val = (524 + (mt9m001->total_h - 1) * (max - min)) / 1048 + min; break; } return 0; } static int mt9m001_s_ctrl(struct v4l2_ctrl *ctrl) { struct mt9m001 *mt9m001 = container_of(ctrl->handler, struct mt9m001, hdl); struct v4l2_subdev *sd = &mt9m001->subdev; struct i2c_client *client = v4l2_get_subdevdata(sd); struct v4l2_ctrl *exp = mt9m001->exposure; int data; switch (ctrl->id) { case V4L2_CID_VFLIP: if (ctrl->val) data = reg_set(client, MT9M001_READ_OPTIONS2, 0x8000); else data = reg_clear(client, MT9M001_READ_OPTIONS2, 0x8000); if (data < 0) return -EIO; return 0; case V4L2_CID_GAIN: /* See Datasheet Table 7, Gain settings. */ if (ctrl->val <= ctrl->default_value) { /* Pack it into 0..1 step 0.125, register values 0..8 */ unsigned long range = ctrl->default_value - ctrl->minimum; data = ((ctrl->val - ctrl->minimum) * 8 + range / 2) / range; dev_dbg(&client->dev, "Setting gain %d\n", data); data = reg_write(client, 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 = ctrl->maximum - ctrl->default_value - 1; unsigned long gain = ((ctrl->val - ctrl->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(&client->dev, "Setting gain from %d to %d\n", reg_read(client, MT9M001_GLOBAL_GAIN), data); data = reg_write(client, MT9M001_GLOBAL_GAIN, data); if (data < 0) return -EIO; } return 0; case V4L2_CID_EXPOSURE_AUTO: if (ctrl->val == V4L2_EXPOSURE_MANUAL) { unsigned long range = exp->maximum - exp->minimum; unsigned long shutter = ((exp->val - exp->minimum) * 1048 + range / 2) / range + 1; dev_dbg(&client->dev, "Setting shutter width from %d to %lu\n", reg_read(client, MT9M001_SHUTTER_WIDTH), shutter); if (reg_write(client, MT9M001_SHUTTER_WIDTH, shutter) < 0) return -EIO; } else { const u16 vblank = 25; mt9m001->total_h = mt9m001->rect.height + mt9m001->y_skip_top + vblank; if (reg_write(client, MT9M001_SHUTTER_WIDTH, mt9m001->total_h) < 0) return -EIO; } return 0; } return -EINVAL; } /* * 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_link *icl, struct i2c_client *client) { struct mt9m001 *mt9m001 = to_mt9m001(client); s32 data; unsigned long flags; int ret; /* Enable the chip */ data = reg_write(client, MT9M001_CHIP_ENABLE, 1); dev_dbg(&client->dev, "write: %d\n", data); /* Read out the chip version register */ data = reg_read(client, 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->fmts = mt9m001_colour_fmts; break; case 0x8431: mt9m001->model = V4L2_IDENT_MT9M001C12STM; mt9m001->fmts = mt9m001_monochrome_fmts; break; default: dev_err(&client->dev, "No MT9M001 chip detected, register read %x\n", data); return -ENODEV; } mt9m001->num_fmts = 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) mt9m001->num_fmts++; else mt9m001->fmts++; if (flags & SOCAM_DATAWIDTH_8) mt9m001->num_fmts++; mt9m001->fmt = &mt9m001->fmts[0]; dev_info(&client->dev, "Detected a MT9M001 chip ID %x (%s)\n", data, data == 0x8431 ? "C12STM" : "C12ST"); ret = mt9m001_init(client); if (ret < 0) dev_err(&client->dev, "Failed to initialise the camera\n"); /* mt9m001_init() has reset the chip, returning registers to defaults */ return v4l2_ctrl_handler_setup(&mt9m001->hdl); } static void mt9m001_video_remove(struct soc_camera_link *icl) { if (icl->free_bus) icl->free_bus(icl); } static int mt9m001_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines) { struct i2c_client *client = v4l2_get_subdevdata(sd); struct mt9m001 *mt9m001 = to_mt9m001(client); *lines = mt9m001->y_skip_top; return 0; } static const struct v4l2_ctrl_ops mt9m001_ctrl_ops = { .g_volatile_ctrl = mt9m001_g_volatile_ctrl, .s_ctrl = mt9m001_s_ctrl, }; static struct v4l2_subdev_core_ops mt9m001_subdev_core_ops = { .g_chip_ident = mt9m001_g_chip_ident, #ifdef CONFIG_VIDEO_ADV_DEBUG .g_register = mt9m001_g_register, .s_register = mt9m001_s_register, #endif }; static int mt9m001_enum_fmt(struct v4l2_subdev *sd, unsigned int index, enum v4l2_mbus_pixelcode *code) { struct i2c_client *client = v4l2_get_subdevdata(sd); struct mt9m001 *mt9m001 = to_mt9m001(client); if (index >= mt9m001->num_fmts) return -EINVAL; *code = mt9m001->fmts[index].code; return 0; } static int mt9m001_g_mbus_config(struct v4l2_subdev *sd, struct v4l2_mbus_config *cfg) { struct i2c_client *client = v4l2_get_subdevdata(sd); struct soc_camera_link *icl = soc_camera_i2c_to_link(client); /* MT9M001 has all capture_format parameters fixed */ cfg->flags = V4L2_MBUS_PCLK_SAMPLE_FALLING | V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_HIGH | V4L2_MBUS_MASTER; cfg->type = V4L2_MBUS_PARALLEL; cfg->flags = soc_camera_apply_board_flags(icl, cfg); return 0; } static int mt9m001_s_mbus_config(struct v4l2_subdev *sd, const struct v4l2_mbus_config *cfg) { const struct i2c_client *client = v4l2_get_subdevdata(sd); struct soc_camera_link *icl = soc_camera_i2c_to_link(client); struct mt9m001 *mt9m001 = to_mt9m001(client); unsigned int bps = soc_mbus_get_fmtdesc(mt9m001->fmt->code)->bits_per_sample; if (icl->set_bus_param) return icl->set_bus_param(icl, 1 << (bps - 1)); /* * Without board specific bus width settings we only support the * sensors native bus width */ return bps == 10 ? 0 : -EINVAL; } static struct v4l2_subdev_video_ops mt9m001_subdev_video_ops = { .s_stream = mt9m001_s_stream, .s_mbus_fmt = mt9m001_s_fmt, .g_mbus_fmt = mt9m001_g_fmt, .try_mbus_fmt = mt9m001_try_fmt, .s_crop = mt9m001_s_crop, .g_crop = mt9m001_g_crop, .cropcap = mt9m001_cropcap, .enum_mbus_fmt = mt9m001_enum_fmt, .g_mbus_config = mt9m001_g_mbus_config, .s_mbus_config = mt9m001_s_mbus_config, }; static struct v4l2_subdev_sensor_ops mt9m001_subdev_sensor_ops = { .g_skip_top_lines = mt9m001_g_skip_top_lines, }; static struct v4l2_subdev_ops mt9m001_subdev_ops = { .core = &mt9m001_subdev_core_ops, .video = &mt9m001_subdev_video_ops, .sensor = &mt9m001_subdev_sensor_ops, }; static int mt9m001_probe(struct i2c_client *client, const struct i2c_device_id *did) { struct mt9m001 *mt9m001; struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); struct soc_camera_link *icl = soc_camera_i2c_to_link(client); 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; v4l2_i2c_subdev_init(&mt9m001->subdev, client, &mt9m001_subdev_ops); v4l2_ctrl_handler_init(&mt9m001->hdl, 4); v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops, V4L2_CID_VFLIP, 0, 1, 1, 0); v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops, V4L2_CID_GAIN, 0, 127, 1, 64); mt9m001->exposure = v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops, V4L2_CID_EXPOSURE, 1, 255, 1, 255); /* * Simulated autoexposure. If enabled, we calculate shutter width * ourselves in the driver based on vertical blanking and frame width */ mt9m001->autoexposure = v4l2_ctrl_new_std_menu(&mt9m001->hdl, &mt9m001_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0, V4L2_EXPOSURE_AUTO); mt9m001->subdev.ctrl_handler = &mt9m001->hdl; if (mt9m001->hdl.error) { int err = mt9m001->hdl.error; kfree(mt9m001); return err; } v4l2_ctrl_auto_cluster(2, &mt9m001->autoexposure, V4L2_EXPOSURE_MANUAL, true); /* Second stage probe - when a capture adapter is there */ mt9m001->y_skip_top = 0; mt9m001->rect.left = MT9M001_COLUMN_SKIP; mt9m001->rect.top = MT9M001_ROW_SKIP; mt9m001->rect.width = MT9M001_MAX_WIDTH; mt9m001->rect.height = MT9M001_MAX_HEIGHT; ret = mt9m001_video_probe(icl, client); if (ret) { v4l2_ctrl_handler_free(&mt9m001->hdl); kfree(mt9m001); } return ret; } static int mt9m001_remove(struct i2c_client *client) { struct mt9m001 *mt9m001 = to_mt9m001(client); struct soc_camera_link *icl = soc_camera_i2c_to_link(client); v4l2_device_unregister_subdev(&mt9m001->subdev); v4l2_ctrl_handler_free(&mt9m001->hdl); mt9m001_video_remove(icl); kfree(mt9m001); return 0; } static const struct i2c_device_id mt9m001_id[] = { { "mt9m001", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, mt9m001_id); static struct i2c_driver mt9m001_i2c_driver = { .driver = { .name = "mt9m001", }, .probe = mt9m001_probe, .remove = mt9m001_remove, .id_table = mt9m001_id, }; 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 "); MODULE_LICENSE("GPL");