--- /dev/null
+/*
+ * mt9v011 -Micron 1/4-Inch VGA Digital Image Sensor
+ *
+ * Copyright (c) 2009 Mauro Carvalho Chehab
+ * This code is placed under the terms of the GNU General Public License v2
+ */
+
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/videodev2.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <asm/div64.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ctrls.h>
+#include <media/mt9v011.h>
+
+MODULE_DESCRIPTION("Micron mt9v011 sensor driver");
+MODULE_AUTHOR("Mauro Carvalho Chehab");
+MODULE_LICENSE("GPL");
+
+static int debug;
+module_param(debug, int, 0);
+MODULE_PARM_DESC(debug, "Debug level (0-2)");
+
+#define R00_MT9V011_CHIP_VERSION 0x00
+#define R01_MT9V011_ROWSTART 0x01
+#define R02_MT9V011_COLSTART 0x02
+#define R03_MT9V011_HEIGHT 0x03
+#define R04_MT9V011_WIDTH 0x04
+#define R05_MT9V011_HBLANK 0x05
+#define R06_MT9V011_VBLANK 0x06
+#define R07_MT9V011_OUT_CTRL 0x07
+#define R09_MT9V011_SHUTTER_WIDTH 0x09
+#define R0A_MT9V011_CLK_SPEED 0x0a
+#define R0B_MT9V011_RESTART 0x0b
+#define R0C_MT9V011_SHUTTER_DELAY 0x0c
+#define R0D_MT9V011_RESET 0x0d
+#define R1E_MT9V011_DIGITAL_ZOOM 0x1e
+#define R20_MT9V011_READ_MODE 0x20
+#define R2B_MT9V011_GREEN_1_GAIN 0x2b
+#define R2C_MT9V011_BLUE_GAIN 0x2c
+#define R2D_MT9V011_RED_GAIN 0x2d
+#define R2E_MT9V011_GREEN_2_GAIN 0x2e
+#define R35_MT9V011_GLOBAL_GAIN 0x35
+#define RF1_MT9V011_CHIP_ENABLE 0xf1
+
+#define MT9V011_VERSION 0x8232
+#define MT9V011_REV_B_VERSION 0x8243
+
+struct mt9v011 {
+ struct v4l2_subdev sd;
+ struct v4l2_ctrl_handler ctrls;
+ unsigned width, height;
+ unsigned xtal;
+ unsigned hflip:1;
+ unsigned vflip:1;
+
+ u16 global_gain, exposure;
+ s16 red_bal, blue_bal;
+};
+
+static inline struct mt9v011 *to_mt9v011(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct mt9v011, sd);
+}
+
+static int mt9v011_read(struct v4l2_subdev *sd, unsigned char addr)
+{
+ struct i2c_client *c = v4l2_get_subdevdata(sd);
+ __be16 buffer;
+ int rc, val;
+
+ rc = i2c_master_send(c, &addr, 1);
+ if (rc != 1)
+ v4l2_dbg(0, debug, sd,
+ "i2c i/o error: rc == %d (should be 1)\n", rc);
+
+ msleep(10);
+
+ rc = i2c_master_recv(c, (char *)&buffer, 2);
+ if (rc != 2)
+ v4l2_dbg(0, debug, sd,
+ "i2c i/o error: rc == %d (should be 2)\n", rc);
+
+ val = be16_to_cpu(buffer);
+
+ v4l2_dbg(2, debug, sd, "mt9v011: read 0x%02x = 0x%04x\n", addr, val);
+
+ return val;
+}
+
+static void mt9v011_write(struct v4l2_subdev *sd, unsigned char addr,
+ u16 value)
+{
+ struct i2c_client *c = v4l2_get_subdevdata(sd);
+ unsigned char buffer[3];
+ int rc;
+
+ buffer[0] = addr;
+ buffer[1] = value >> 8;
+ buffer[2] = value & 0xff;
+
+ v4l2_dbg(2, debug, sd,
+ "mt9v011: writing 0x%02x 0x%04x\n", buffer[0], value);
+ rc = i2c_master_send(c, buffer, 3);
+ if (rc != 3)
+ v4l2_dbg(0, debug, sd,
+ "i2c i/o error: rc == %d (should be 3)\n", rc);
+}
+
+
+struct i2c_reg_value {
+ unsigned char reg;
+ u16 value;
+};
+
+/*
+ * Values used at the original driver
+ * Some values are marked as Reserved at the datasheet
+ */
+static const struct i2c_reg_value mt9v011_init_default[] = {
+ { R0D_MT9V011_RESET, 0x0001 },
+ { R0D_MT9V011_RESET, 0x0000 },
+
+ { R0C_MT9V011_SHUTTER_DELAY, 0x0000 },
+ { R09_MT9V011_SHUTTER_WIDTH, 0x1fc },
+
+ { R0A_MT9V011_CLK_SPEED, 0x0000 },
+ { R1E_MT9V011_DIGITAL_ZOOM, 0x0000 },
+
+ { R07_MT9V011_OUT_CTRL, 0x0002 }, /* chip enable */
+};
+
+
+static u16 calc_mt9v011_gain(s16 lineargain)
+{
+
+ u16 digitalgain = 0;
+ u16 analogmult = 0;
+ u16 analoginit = 0;
+
+ if (lineargain < 0)
+ lineargain = 0;
+
+ /* recommended minimum */
+ lineargain += 0x0020;
+
+ if (lineargain > 2047)
+ lineargain = 2047;
+
+ if (lineargain > 1023) {
+ digitalgain = 3;
+ analogmult = 3;
+ analoginit = lineargain / 16;
+ } else if (lineargain > 511) {
+ digitalgain = 1;
+ analogmult = 3;
+ analoginit = lineargain / 8;
+ } else if (lineargain > 255) {
+ analogmult = 3;
+ analoginit = lineargain / 4;
+ } else if (lineargain > 127) {
+ analogmult = 1;
+ analoginit = lineargain / 2;
+ } else
+ analoginit = lineargain;
+
+ return analoginit + (analogmult << 7) + (digitalgain << 9);
+
+}
+
+static void set_balance(struct v4l2_subdev *sd)
+{
+ struct mt9v011 *core = to_mt9v011(sd);
+ u16 green_gain, blue_gain, red_gain;
+ u16 exposure;
+ s16 bal;
+
+ exposure = core->exposure;
+
+ green_gain = calc_mt9v011_gain(core->global_gain);
+
+ bal = core->global_gain;
+ bal += (core->blue_bal * core->global_gain / (1 << 7));
+ blue_gain = calc_mt9v011_gain(bal);
+
+ bal = core->global_gain;
+ bal += (core->red_bal * core->global_gain / (1 << 7));
+ red_gain = calc_mt9v011_gain(bal);
+
+ mt9v011_write(sd, R2B_MT9V011_GREEN_1_GAIN, green_gain);
+ mt9v011_write(sd, R2E_MT9V011_GREEN_2_GAIN, green_gain);
+ mt9v011_write(sd, R2C_MT9V011_BLUE_GAIN, blue_gain);
+ mt9v011_write(sd, R2D_MT9V011_RED_GAIN, red_gain);
+ mt9v011_write(sd, R09_MT9V011_SHUTTER_WIDTH, exposure);
+}
+
+static void calc_fps(struct v4l2_subdev *sd, u32 *numerator, u32 *denominator)
+{
+ struct mt9v011 *core = to_mt9v011(sd);
+ unsigned height, width, hblank, vblank, speed;
+ unsigned row_time, t_time;
+ u64 frames_per_ms;
+ unsigned tmp;
+
+ height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
+ width = mt9v011_read(sd, R04_MT9V011_WIDTH);
+ hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
+ vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
+ speed = mt9v011_read(sd, R0A_MT9V011_CLK_SPEED);
+
+ row_time = (width + 113 + hblank) * (speed + 2);
+ t_time = row_time * (height + vblank + 1);
+
+ frames_per_ms = core->xtal * 1000l;
+ do_div(frames_per_ms, t_time);
+ tmp = frames_per_ms;
+
+ v4l2_dbg(1, debug, sd, "Programmed to %u.%03u fps (%d pixel clcks)\n",
+ tmp / 1000, tmp % 1000, t_time);
+
+ if (numerator && denominator) {
+ *numerator = 1000;
+ *denominator = (u32)frames_per_ms;
+ }
+}
+
+static u16 calc_speed(struct v4l2_subdev *sd, u32 numerator, u32 denominator)
+{
+ struct mt9v011 *core = to_mt9v011(sd);
+ unsigned height, width, hblank, vblank;
+ unsigned row_time, line_time;
+ u64 t_time, speed;
+
+ /* Avoid bogus calculus */
+ if (!numerator || !denominator)
+ return 0;
+
+ height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
+ width = mt9v011_read(sd, R04_MT9V011_WIDTH);
+ hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
+ vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
+
+ row_time = width + 113 + hblank;
+ line_time = height + vblank + 1;
+
+ t_time = core->xtal * ((u64)numerator);
+ /* round to the closest value */
+ t_time += denominator / 2;
+ do_div(t_time, denominator);
+
+ speed = t_time;
+ do_div(speed, row_time * line_time);
+
+ /* Avoid having a negative value for speed */
+ if (speed < 2)
+ speed = 0;
+ else
+ speed -= 2;
+
+ /* Avoid speed overflow */
+ if (speed > 15)
+ return 15;
+
+ return (u16)speed;
+}
+
+static void set_res(struct v4l2_subdev *sd)
+{
+ struct mt9v011 *core = to_mt9v011(sd);
+ unsigned vstart, hstart;
+
+ /*
+ * The mt9v011 doesn't have scaling. So, in order to select the desired
+ * resolution, we're cropping at the middle of the sensor.
+ * hblank and vblank should be adjusted, in order to warrant that
+ * we'll preserve the line timings for 30 fps, no matter what resolution
+ * is selected.
+ * NOTE: datasheet says that width (and height) should be filled with
+ * width-1. However, this doesn't work, since one pixel per line will
+ * be missing.
+ */
+
+ hstart = 20 + (640 - core->width) / 2;
+ mt9v011_write(sd, R02_MT9V011_COLSTART, hstart);
+ mt9v011_write(sd, R04_MT9V011_WIDTH, core->width);
+ mt9v011_write(sd, R05_MT9V011_HBLANK, 771 - core->width);
+
+ vstart = 8 + (480 - core->height) / 2;
+ mt9v011_write(sd, R01_MT9V011_ROWSTART, vstart);
+ mt9v011_write(sd, R03_MT9V011_HEIGHT, core->height);
+ mt9v011_write(sd, R06_MT9V011_VBLANK, 508 - core->height);
+
+ calc_fps(sd, NULL, NULL);
+};
+
+static void set_read_mode(struct v4l2_subdev *sd)
+{
+ struct mt9v011 *core = to_mt9v011(sd);
+ unsigned mode = 0x1000;
+
+ if (core->hflip)
+ mode |= 0x4000;
+
+ if (core->vflip)
+ mode |= 0x8000;
+
+ mt9v011_write(sd, R20_MT9V011_READ_MODE, mode);
+}
+
+static int mt9v011_reset(struct v4l2_subdev *sd, u32 val)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(mt9v011_init_default); i++)
+ mt9v011_write(sd, mt9v011_init_default[i].reg,
+ mt9v011_init_default[i].value);
+
+ set_balance(sd);
+ set_res(sd);
+ set_read_mode(sd);
+
+ return 0;
+}
+
+static int mt9v011_enum_mbus_fmt(struct v4l2_subdev *sd, unsigned index,
+ u32 *code)
+{
+ if (index > 0)
+ return -EINVAL;
+
+ *code = MEDIA_BUS_FMT_SGRBG8_1X8;
+ return 0;
+}
+
+static int mt9v011_try_mbus_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *fmt)
+{
+ if (fmt->code != MEDIA_BUS_FMT_SGRBG8_1X8)
+ return -EINVAL;
+
+ v4l_bound_align_image(&fmt->width, 48, 639, 1,
+ &fmt->height, 32, 480, 1, 0);
+ fmt->field = V4L2_FIELD_NONE;
+ fmt->colorspace = V4L2_COLORSPACE_SRGB;
+
+ return 0;
+}
+
+static int mt9v011_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
+{
+ struct v4l2_captureparm *cp = &parms->parm.capture;
+
+ if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ return -EINVAL;
+
+ memset(cp, 0, sizeof(struct v4l2_captureparm));
+ cp->capability = V4L2_CAP_TIMEPERFRAME;
+ calc_fps(sd,
+ &cp->timeperframe.numerator,
+ &cp->timeperframe.denominator);
+
+ return 0;
+}
+
+static int mt9v011_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
+{
+ struct v4l2_captureparm *cp = &parms->parm.capture;
+ struct v4l2_fract *tpf = &cp->timeperframe;
+ u16 speed;
+
+ if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ return -EINVAL;
+ if (cp->extendedmode != 0)
+ return -EINVAL;
+
+ speed = calc_speed(sd, tpf->numerator, tpf->denominator);
+
+ mt9v011_write(sd, R0A_MT9V011_CLK_SPEED, speed);
+ v4l2_dbg(1, debug, sd, "Setting speed to %d\n", speed);
+
+ /* Recalculate and update fps info */
+ calc_fps(sd, &tpf->numerator, &tpf->denominator);
+
+ return 0;
+}
+
+static int mt9v011_s_mbus_fmt(struct v4l2_subdev *sd, struct v4l2_mbus_framefmt *fmt)
+{
+ struct mt9v011 *core = to_mt9v011(sd);
+ int rc;
+
+ rc = mt9v011_try_mbus_fmt(sd, fmt);
+ if (rc < 0)
+ return -EINVAL;
+
+ core->width = fmt->width;
+ core->height = fmt->height;
+
+ set_res(sd);
+
+ return 0;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+static int mt9v011_g_register(struct v4l2_subdev *sd,
+ struct v4l2_dbg_register *reg)
+{
+ reg->val = mt9v011_read(sd, reg->reg & 0xff);
+ reg->size = 2;
+
+ return 0;
+}
+
+static int mt9v011_s_register(struct v4l2_subdev *sd,
+ const struct v4l2_dbg_register *reg)
+{
+ mt9v011_write(sd, reg->reg & 0xff, reg->val & 0xffff);
+
+ return 0;
+}
+#endif
+
+static int mt9v011_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct mt9v011 *core =
+ container_of(ctrl->handler, struct mt9v011, ctrls);
+ struct v4l2_subdev *sd = &core->sd;
+
+ switch (ctrl->id) {
+ case V4L2_CID_GAIN:
+ core->global_gain = ctrl->val;
+ break;
+ case V4L2_CID_EXPOSURE:
+ core->exposure = ctrl->val;
+ break;
+ case V4L2_CID_RED_BALANCE:
+ core->red_bal = ctrl->val;
+ break;
+ case V4L2_CID_BLUE_BALANCE:
+ core->blue_bal = ctrl->val;
+ break;
+ case V4L2_CID_HFLIP:
+ core->hflip = ctrl->val;
+ set_read_mode(sd);
+ return 0;
+ case V4L2_CID_VFLIP:
+ core->vflip = ctrl->val;
+ set_read_mode(sd);
+ return 0;
+ default:
+ return -EINVAL;
+ }
+
+ set_balance(sd);
+ return 0;
+}
+
+static struct v4l2_ctrl_ops mt9v011_ctrl_ops = {
+ .s_ctrl = mt9v011_s_ctrl,
+};
+
+static const struct v4l2_subdev_core_ops mt9v011_core_ops = {
+ .reset = mt9v011_reset,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+ .g_register = mt9v011_g_register,
+ .s_register = mt9v011_s_register,
+#endif
+};
+
+static const struct v4l2_subdev_video_ops mt9v011_video_ops = {
+ .enum_mbus_fmt = mt9v011_enum_mbus_fmt,
+ .try_mbus_fmt = mt9v011_try_mbus_fmt,
+ .s_mbus_fmt = mt9v011_s_mbus_fmt,
+ .g_parm = mt9v011_g_parm,
+ .s_parm = mt9v011_s_parm,
+};
+
+static const struct v4l2_subdev_ops mt9v011_ops = {
+ .core = &mt9v011_core_ops,
+ .video = &mt9v011_video_ops,
+};
+
+
+/****************************************************************************
+ I2C Client & Driver
+ ****************************************************************************/
+
+static int mt9v011_probe(struct i2c_client *c,
+ const struct i2c_device_id *id)
+{
+ u16 version;
+ struct mt9v011 *core;
+ struct v4l2_subdev *sd;
+
+ /* Check if the adapter supports the needed features */
+ if (!i2c_check_functionality(c->adapter,
+ I2C_FUNC_SMBUS_READ_BYTE | I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
+ return -EIO;
+
+ core = devm_kzalloc(&c->dev, sizeof(struct mt9v011), GFP_KERNEL);
+ if (!core)
+ return -ENOMEM;
+
+ sd = &core->sd;
+ v4l2_i2c_subdev_init(sd, c, &mt9v011_ops);
+
+ /* Check if the sensor is really a MT9V011 */
+ version = mt9v011_read(sd, R00_MT9V011_CHIP_VERSION);
+ if ((version != MT9V011_VERSION) &&
+ (version != MT9V011_REV_B_VERSION)) {
+ v4l2_info(sd, "*** unknown micron chip detected (0x%04x).\n",
+ version);
+ return -EINVAL;
+ }
+
+ v4l2_ctrl_handler_init(&core->ctrls, 5);
+ v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
+ V4L2_CID_GAIN, 0, (1 << 12) - 1 - 0x20, 1, 0x20);
+ v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
+ V4L2_CID_EXPOSURE, 0, 2047, 1, 0x01fc);
+ v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
+ V4L2_CID_RED_BALANCE, -(1 << 9), (1 << 9) - 1, 1, 0);
+ v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
+ V4L2_CID_BLUE_BALANCE, -(1 << 9), (1 << 9) - 1, 1, 0);
+ v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
+ V4L2_CID_HFLIP, 0, 1, 1, 0);
+ v4l2_ctrl_new_std(&core->ctrls, &mt9v011_ctrl_ops,
+ V4L2_CID_VFLIP, 0, 1, 1, 0);
+
+ if (core->ctrls.error) {
+ int ret = core->ctrls.error;
+
+ v4l2_err(sd, "control initialization error %d\n", ret);
+ v4l2_ctrl_handler_free(&core->ctrls);
+ return ret;
+ }
+ core->sd.ctrl_handler = &core->ctrls;
+
+ core->global_gain = 0x0024;
+ core->exposure = 0x01fc;
+ core->width = 640;
+ core->height = 480;
+ core->xtal = 27000000; /* Hz */
+
+ if (c->dev.platform_data) {
+ struct mt9v011_platform_data *pdata = c->dev.platform_data;
+
+ core->xtal = pdata->xtal;
+ v4l2_dbg(1, debug, sd, "xtal set to %d.%03d MHz\n",
+ core->xtal / 1000000, (core->xtal / 1000) % 1000);
+ }
+
+ v4l_info(c, "chip found @ 0x%02x (%s - chip version 0x%04x)\n",
+ c->addr << 1, c->adapter->name, version);
+
+ return 0;
+}
+
+static int mt9v011_remove(struct i2c_client *c)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(c);
+ struct mt9v011 *core = to_mt9v011(sd);
+
+ v4l2_dbg(1, debug, sd,
+ "mt9v011.c: removing mt9v011 adapter on address 0x%x\n",
+ c->addr << 1);
+
+ v4l2_device_unregister_subdev(sd);
+ v4l2_ctrl_handler_free(&core->ctrls);
+
+ return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static const struct i2c_device_id mt9v011_id[] = {
+ { "mt9v011", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, mt9v011_id);
+
+static struct i2c_driver mt9v011_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "mt9v011",
+ },
+ .probe = mt9v011_probe,
+ .remove = mt9v011_remove,
+ .id_table = mt9v011_id,
+};
+
+module_i2c_driver(mt9v011_driver);
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