609 lines
15 KiB
C
609 lines
15 KiB
C
/*
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* mt9v011 -Micron 1/4-Inch VGA Digital Image Sensor
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*
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* Copyright (c) 2009 Mauro Carvalho Chehab
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* This code is placed under the terms of the GNU General Public License v2
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*/
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/videodev2.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <asm/div64.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ctrls.h>
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#include <media/i2c/mt9v011.h>
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MODULE_DESCRIPTION("Micron mt9v011 sensor driver");
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MODULE_AUTHOR("Mauro Carvalho Chehab");
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MODULE_LICENSE("GPL");
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static int debug;
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module_param(debug, int, 0);
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MODULE_PARM_DESC(debug, "Debug level (0-2)");
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#define R00_MT9V011_CHIP_VERSION 0x00
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#define R01_MT9V011_ROWSTART 0x01
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#define R02_MT9V011_COLSTART 0x02
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#define R03_MT9V011_HEIGHT 0x03
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#define R04_MT9V011_WIDTH 0x04
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#define R05_MT9V011_HBLANK 0x05
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#define R06_MT9V011_VBLANK 0x06
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#define R07_MT9V011_OUT_CTRL 0x07
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#define R09_MT9V011_SHUTTER_WIDTH 0x09
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#define R0A_MT9V011_CLK_SPEED 0x0a
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#define R0B_MT9V011_RESTART 0x0b
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#define R0C_MT9V011_SHUTTER_DELAY 0x0c
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#define R0D_MT9V011_RESET 0x0d
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#define R1E_MT9V011_DIGITAL_ZOOM 0x1e
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#define R20_MT9V011_READ_MODE 0x20
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#define R2B_MT9V011_GREEN_1_GAIN 0x2b
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#define R2C_MT9V011_BLUE_GAIN 0x2c
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#define R2D_MT9V011_RED_GAIN 0x2d
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#define R2E_MT9V011_GREEN_2_GAIN 0x2e
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#define R35_MT9V011_GLOBAL_GAIN 0x35
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#define RF1_MT9V011_CHIP_ENABLE 0xf1
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#define MT9V011_VERSION 0x8232
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#define MT9V011_REV_B_VERSION 0x8243
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struct mt9v011 {
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struct v4l2_subdev sd;
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#ifdef CONFIG_MEDIA_CONTROLLER
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struct media_pad pad;
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#endif
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struct v4l2_ctrl_handler ctrls;
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unsigned width, height;
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unsigned xtal;
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unsigned hflip:1;
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unsigned vflip:1;
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u16 global_gain, exposure;
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s16 red_bal, blue_bal;
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};
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static inline struct mt9v011 *to_mt9v011(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct mt9v011, sd);
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}
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static int mt9v011_read(struct v4l2_subdev *sd, unsigned char addr)
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{
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struct i2c_client *c = v4l2_get_subdevdata(sd);
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__be16 buffer;
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int rc, val;
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rc = i2c_master_send(c, &addr, 1);
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if (rc != 1)
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v4l2_dbg(0, debug, sd,
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"i2c i/o error: rc == %d (should be 1)\n", rc);
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msleep(10);
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rc = i2c_master_recv(c, (char *)&buffer, 2);
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if (rc != 2)
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v4l2_dbg(0, debug, sd,
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"i2c i/o error: rc == %d (should be 2)\n", rc);
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val = be16_to_cpu(buffer);
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v4l2_dbg(2, debug, sd, "mt9v011: read 0x%02x = 0x%04x\n", addr, val);
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return val;
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}
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static void mt9v011_write(struct v4l2_subdev *sd, unsigned char addr,
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u16 value)
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{
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struct i2c_client *c = v4l2_get_subdevdata(sd);
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unsigned char buffer[3];
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int rc;
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buffer[0] = addr;
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buffer[1] = value >> 8;
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buffer[2] = value & 0xff;
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v4l2_dbg(2, debug, sd,
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"mt9v011: writing 0x%02x 0x%04x\n", buffer[0], value);
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rc = i2c_master_send(c, buffer, 3);
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if (rc != 3)
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v4l2_dbg(0, debug, sd,
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"i2c i/o error: rc == %d (should be 3)\n", rc);
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}
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struct i2c_reg_value {
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unsigned char reg;
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u16 value;
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};
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/*
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* Values used at the original driver
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* Some values are marked as Reserved at the datasheet
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*/
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static const struct i2c_reg_value mt9v011_init_default[] = {
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{ R0D_MT9V011_RESET, 0x0001 },
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{ R0D_MT9V011_RESET, 0x0000 },
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{ R0C_MT9V011_SHUTTER_DELAY, 0x0000 },
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{ R09_MT9V011_SHUTTER_WIDTH, 0x1fc },
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{ R0A_MT9V011_CLK_SPEED, 0x0000 },
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{ R1E_MT9V011_DIGITAL_ZOOM, 0x0000 },
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{ R07_MT9V011_OUT_CTRL, 0x0002 }, /* chip enable */
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};
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static u16 calc_mt9v011_gain(s16 lineargain)
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{
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u16 digitalgain = 0;
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u16 analogmult = 0;
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u16 analoginit = 0;
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if (lineargain < 0)
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lineargain = 0;
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/* recommended minimum */
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lineargain += 0x0020;
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if (lineargain > 2047)
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lineargain = 2047;
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if (lineargain > 1023) {
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digitalgain = 3;
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analogmult = 3;
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analoginit = lineargain / 16;
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} else if (lineargain > 511) {
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digitalgain = 1;
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analogmult = 3;
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analoginit = lineargain / 8;
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} else if (lineargain > 255) {
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analogmult = 3;
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analoginit = lineargain / 4;
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} else if (lineargain > 127) {
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analogmult = 1;
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analoginit = lineargain / 2;
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} else
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analoginit = lineargain;
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return analoginit + (analogmult << 7) + (digitalgain << 9);
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}
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static void set_balance(struct v4l2_subdev *sd)
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{
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struct mt9v011 *core = to_mt9v011(sd);
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u16 green_gain, blue_gain, red_gain;
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u16 exposure;
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s16 bal;
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exposure = core->exposure;
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green_gain = calc_mt9v011_gain(core->global_gain);
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bal = core->global_gain;
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bal += (core->blue_bal * core->global_gain / (1 << 7));
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blue_gain = calc_mt9v011_gain(bal);
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bal = core->global_gain;
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bal += (core->red_bal * core->global_gain / (1 << 7));
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red_gain = calc_mt9v011_gain(bal);
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mt9v011_write(sd, R2B_MT9V011_GREEN_1_GAIN, green_gain);
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mt9v011_write(sd, R2E_MT9V011_GREEN_2_GAIN, green_gain);
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mt9v011_write(sd, R2C_MT9V011_BLUE_GAIN, blue_gain);
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mt9v011_write(sd, R2D_MT9V011_RED_GAIN, red_gain);
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mt9v011_write(sd, R09_MT9V011_SHUTTER_WIDTH, exposure);
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}
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static void calc_fps(struct v4l2_subdev *sd, u32 *numerator, u32 *denominator)
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{
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struct mt9v011 *core = to_mt9v011(sd);
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unsigned height, width, hblank, vblank, speed;
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unsigned row_time, t_time;
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u64 frames_per_ms;
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unsigned tmp;
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height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
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width = mt9v011_read(sd, R04_MT9V011_WIDTH);
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hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
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vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
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speed = mt9v011_read(sd, R0A_MT9V011_CLK_SPEED);
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row_time = (width + 113 + hblank) * (speed + 2);
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t_time = row_time * (height + vblank + 1);
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frames_per_ms = core->xtal * 1000l;
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do_div(frames_per_ms, t_time);
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tmp = frames_per_ms;
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v4l2_dbg(1, debug, sd, "Programmed to %u.%03u fps (%d pixel clcks)\n",
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tmp / 1000, tmp % 1000, t_time);
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if (numerator && denominator) {
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*numerator = 1000;
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*denominator = (u32)frames_per_ms;
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}
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}
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static u16 calc_speed(struct v4l2_subdev *sd, u32 numerator, u32 denominator)
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{
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struct mt9v011 *core = to_mt9v011(sd);
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unsigned height, width, hblank, vblank;
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unsigned row_time, line_time;
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u64 t_time, speed;
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/* Avoid bogus calculus */
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if (!numerator || !denominator)
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return 0;
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height = mt9v011_read(sd, R03_MT9V011_HEIGHT);
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width = mt9v011_read(sd, R04_MT9V011_WIDTH);
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hblank = mt9v011_read(sd, R05_MT9V011_HBLANK);
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vblank = mt9v011_read(sd, R06_MT9V011_VBLANK);
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row_time = width + 113 + hblank;
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line_time = height + vblank + 1;
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t_time = core->xtal * ((u64)numerator);
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/* round to the closest value */
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t_time += denominator / 2;
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do_div(t_time, denominator);
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speed = t_time;
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do_div(speed, row_time * line_time);
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/* Avoid having a negative value for speed */
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if (speed < 2)
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speed = 0;
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else
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speed -= 2;
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/* Avoid speed overflow */
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if (speed > 15)
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return 15;
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return (u16)speed;
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}
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static void set_res(struct v4l2_subdev *sd)
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{
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struct mt9v011 *core = to_mt9v011(sd);
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unsigned vstart, hstart;
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/*
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* The mt9v011 doesn't have scaling. So, in order to select the desired
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* resolution, we're cropping at the middle of the sensor.
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* hblank and vblank should be adjusted, in order to warrant that
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* we'll preserve the line timings for 30 fps, no matter what resolution
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* is selected.
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* NOTE: datasheet says that width (and height) should be filled with
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* width-1. However, this doesn't work, since one pixel per line will
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* be missing.
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*/
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hstart = 20 + (640 - core->width) / 2;
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mt9v011_write(sd, R02_MT9V011_COLSTART, hstart);
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mt9v011_write(sd, R04_MT9V011_WIDTH, core->width);
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mt9v011_write(sd, R05_MT9V011_HBLANK, 771 - core->width);
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vstart = 8 + (480 - core->height) / 2;
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mt9v011_write(sd, R01_MT9V011_ROWSTART, vstart);
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mt9v011_write(sd, R03_MT9V011_HEIGHT, core->height);
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mt9v011_write(sd, R06_MT9V011_VBLANK, 508 - core->height);
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calc_fps(sd, NULL, NULL);
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};
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static void set_read_mode(struct v4l2_subdev *sd)
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{
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struct mt9v011 *core = to_mt9v011(sd);
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unsigned mode = 0x1000;
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if (core->hflip)
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mode |= 0x4000;
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if (core->vflip)
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mode |= 0x8000;
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mt9v011_write(sd, R20_MT9V011_READ_MODE, mode);
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}
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static int mt9v011_reset(struct v4l2_subdev *sd, u32 val)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(mt9v011_init_default); i++)
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mt9v011_write(sd, mt9v011_init_default[i].reg,
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mt9v011_init_default[i].value);
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set_balance(sd);
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set_res(sd);
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set_read_mode(sd);
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return 0;
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}
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static int mt9v011_enum_mbus_code(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_mbus_code_enum *code)
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{
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if (code->pad || code->index > 0)
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return -EINVAL;
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code->code = MEDIA_BUS_FMT_SGRBG8_1X8;
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return 0;
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}
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static int mt9v011_set_fmt(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_format *format)
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{
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struct v4l2_mbus_framefmt *fmt = &format->format;
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struct mt9v011 *core = to_mt9v011(sd);
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if (format->pad || fmt->code != MEDIA_BUS_FMT_SGRBG8_1X8)
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return -EINVAL;
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v4l_bound_align_image(&fmt->width, 48, 639, 1,
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&fmt->height, 32, 480, 1, 0);
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fmt->field = V4L2_FIELD_NONE;
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fmt->colorspace = V4L2_COLORSPACE_SRGB;
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if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
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core->width = fmt->width;
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core->height = fmt->height;
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set_res(sd);
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} else {
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cfg->try_fmt = *fmt;
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}
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return 0;
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}
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static int mt9v011_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
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{
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struct v4l2_captureparm *cp = &parms->parm.capture;
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if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
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return -EINVAL;
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memset(cp, 0, sizeof(struct v4l2_captureparm));
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cp->capability = V4L2_CAP_TIMEPERFRAME;
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calc_fps(sd,
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&cp->timeperframe.numerator,
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&cp->timeperframe.denominator);
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return 0;
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}
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static int mt9v011_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
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{
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struct v4l2_captureparm *cp = &parms->parm.capture;
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struct v4l2_fract *tpf = &cp->timeperframe;
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u16 speed;
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if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
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return -EINVAL;
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if (cp->extendedmode != 0)
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return -EINVAL;
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speed = calc_speed(sd, tpf->numerator, tpf->denominator);
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mt9v011_write(sd, R0A_MT9V011_CLK_SPEED, speed);
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v4l2_dbg(1, debug, sd, "Setting speed to %d\n", speed);
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/* Recalculate and update fps info */
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calc_fps(sd, &tpf->numerator, &tpf->denominator);
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return 0;
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}
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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static int mt9v011_g_register(struct v4l2_subdev *sd,
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struct v4l2_dbg_register *reg)
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{
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reg->val = mt9v011_read(sd, reg->reg & 0xff);
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reg->size = 2;
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return 0;
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}
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static int mt9v011_s_register(struct v4l2_subdev *sd,
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const struct v4l2_dbg_register *reg)
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{
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mt9v011_write(sd, reg->reg & 0xff, reg->val & 0xffff);
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return 0;
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}
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#endif
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static int mt9v011_s_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct mt9v011 *core =
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container_of(ctrl->handler, struct mt9v011, ctrls);
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struct v4l2_subdev *sd = &core->sd;
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switch (ctrl->id) {
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case V4L2_CID_GAIN:
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core->global_gain = ctrl->val;
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break;
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case V4L2_CID_EXPOSURE:
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core->exposure = ctrl->val;
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break;
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case V4L2_CID_RED_BALANCE:
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core->red_bal = ctrl->val;
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break;
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case V4L2_CID_BLUE_BALANCE:
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core->blue_bal = ctrl->val;
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break;
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case V4L2_CID_HFLIP:
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core->hflip = ctrl->val;
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set_read_mode(sd);
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return 0;
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case V4L2_CID_VFLIP:
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core->vflip = ctrl->val;
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set_read_mode(sd);
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return 0;
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default:
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return -EINVAL;
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}
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set_balance(sd);
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return 0;
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}
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static const struct v4l2_ctrl_ops mt9v011_ctrl_ops = {
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.s_ctrl = mt9v011_s_ctrl,
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};
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static const struct v4l2_subdev_core_ops mt9v011_core_ops = {
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.reset = mt9v011_reset,
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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.g_register = mt9v011_g_register,
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.s_register = mt9v011_s_register,
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#endif
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};
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static const struct v4l2_subdev_video_ops mt9v011_video_ops = {
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.g_parm = mt9v011_g_parm,
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.s_parm = mt9v011_s_parm,
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};
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static const struct v4l2_subdev_pad_ops mt9v011_pad_ops = {
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.enum_mbus_code = mt9v011_enum_mbus_code,
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.set_fmt = mt9v011_set_fmt,
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};
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static const struct v4l2_subdev_ops mt9v011_ops = {
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.core = &mt9v011_core_ops,
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.video = &mt9v011_video_ops,
|
|
.pad = &mt9v011_pad_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;
|
|
#ifdef CONFIG_MEDIA_CONTROLLER
|
|
int ret;
|
|
#endif
|
|
|
|
/* 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);
|
|
|
|
#ifdef CONFIG_MEDIA_CONTROLLER
|
|
core->pad.flags = MEDIA_PAD_FL_SOURCE;
|
|
sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
|
|
|
|
ret = media_entity_pads_init(&sd->entity, 1, &core->pad);
|
|
if (ret < 0)
|
|
return ret;
|
|
#endif
|
|
|
|
/* 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 = {
|
|
.name = "mt9v011",
|
|
},
|
|
.probe = mt9v011_probe,
|
|
.remove = mt9v011_remove,
|
|
.id_table = mt9v011_id,
|
|
};
|
|
|
|
module_i2c_driver(mt9v011_driver);
|