/* * 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 #ifdef CONFIG_MT9M001_PCA9536_SWITCH #include #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", __func__); 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_video_probe(struct soc_camera_device *); static void mt9m001_video_remove(struct soc_camera_device *); static int mt9m001_get_control(struct soc_camera_device *, struct v4l2_control *); static int mt9m001_set_control(struct soc_camera_device *, struct v4l2_control *); static struct soc_camera_ops mt9m001_ops = { .owner = THIS_MODULE, .probe = mt9m001_video_probe, .remove = mt9m001_video_remove, .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, .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; icd->formats = mt9m001_colour_formats; if (mt9m001->client->dev.platform_data) icd->num_formats = ARRAY_SIZE(mt9m001_colour_formats); else icd->num_formats = 1; break; case 0x8431: mt9m001->model = V4L2_IDENT_MT9M001C12STM; icd->formats = mt9m001_monochrome_formats; if (mt9m001->client->dev.platform_data) icd->num_formats = ARRAY_SIZE(mt9m001_monochrome_formats); else icd->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, const struct i2c_device_id *did) { 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->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 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");