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    Subject[PATCH 01/10] staging: media: go7007: Some additional code for TW2804 driver functionality
    Date
    - using new v4l2 framework controls
    - function for reading volatile controls via i2c bus
    - separate V4L2_CID_ ctrls into each V4L2 calls

    Signed-off-by: Volokh Konstantin <volokh84@gmail.com>
    ---
    drivers/staging/media/go7007/wis-tw2804.c | 248 +++++++++++++++++++++++++++++
    1 files changed, 248 insertions(+), 0 deletions(-)

    diff --git a/drivers/staging/media/go7007/wis-tw2804.c b/drivers/staging/media/go7007/wis-tw2804.c
    index 9134f03..05851d3 100644
    --- a/drivers/staging/media/go7007/wis-tw2804.c
    +++ b/drivers/staging/media/go7007/wis-tw2804.c
    @@ -21,10 +21,18 @@
    #include <linux/videodev2.h>
    #include <linux/ioctl.h>
    #include <linux/slab.h>
    +#include <media/v4l2-subdev.h>
    +#include <media/v4l2-device.h>
    +#include <media/v4l2-chip-ident.h>
    +#include <media/v4l2-ctrls.h>

    #include "wis-i2c.h"

    struct wis_tw2804 {
    + struct v4l2_subdev sd;
    + struct v4l2_ctrl_handler hdl;
    + u8 channel:2;
    + u8 input:1;
    int channel;
    int norm;
    int brightness;
    @@ -116,9 +124,246 @@ static int write_regs(struct i2c_client *client, u8 *regs, int channel)
    if (i2c_smbus_write_byte_data(client,
    regs[i] | (channel << 6), regs[i + 1]) < 0)
    return -1;
    +static s32 read_reg(struct i2c_client *client, u8 reg, u8 channel)
    +{
    + return i2c_smbus_read_byte_data(client, (reg) | (channel << 6));
    +}
    +
    +inline struct wis_tw2804 *to_state(struct v4l2_subdev *sd)
    +{
    + return container_of(sd, struct wis_tw2804, sd);
    +}
    +
    +inline struct wis_tw2804 *to_state_from_ctrl(struct v4l2_ctrl *ctrl)
    +{
    + return container_of(ctrl->handler, struct wis_tw2804, hdl);
    +}
    +
    +static int tw2804_log_status(struct v4l2_subdev *sd)
    +{
    + struct wis_tw2804 *state = to_state(sd);
    + v4l2_info(sd, "Standard: %s\n",
    + state->norm == V4L2_STD_NTSC ? "NTSC" :
    + state->norm == V4L2_STD_PAL ? "PAL" : "unknown");
    + v4l2_info(sd, "Channel: %d\n", state->channel);
    + v4l2_info(sd, "Input: %d\n", state->input);
    + v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
    + return 0;
    +}
    +
    +static s32 get_ctrl_addr(int ctrl)
    +{
    + switch (ctrl) {
    + case V4L2_CID_BRIGHTNESS:
    + return 0x12;
    + case V4L2_CID_CONTRAST:
    + return 0x11;
    + case V4L2_CID_SATURATION:
    + return 0x10;
    + case V4L2_CID_HUE:
    + return 0x0f;
    + case V4L2_CID_AUTOGAIN:
    + return 0x02;
    + case V4L2_CID_COLOR_KILLER:
    + return 0x14;
    + case V4L2_CID_GAIN:
    + return 0x3c;
    + case V4L2_CID_CHROMA_GAIN:
    + return 0x3d;
    + case V4L2_CID_RED_BALANCE:
    + return 0x3f;
    + case V4L2_CID_BLUE_BALANCE:
    + return 0x3e;
    + default:
    + return -EINVAL;
    + }
    +}
    +
    +static int tw2804_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
    +{
    + struct v4l2_subdev *sd = &to_state_from_ctrl(ctrl)->sd;
    + struct i2c_client *client = v4l2_get_subdevdata(sd);
    + s32 addr = get_ctrl_addr(ctrl->id);
    +
    + if (addr == -EINVAL)
    + return -EINVAL;
    +
    + switch (ctrl->id) {
    + case V4L2_CID_GAIN:
    + case V4L2_CID_CHROMA_GAIN:
    + case V4L2_CID_RED_BALANCE:
    + case V4L2_CID_BLUE_BALANCE:
    + ctrl->cur.val = read_reg(client, addr, 0);
    + break;
    + default:
    + return -EINVAL;
    + }
    + return 0;
    +}
    +
    +static int tw2804_s_ctrl(struct v4l2_ctrl *ctrl)
    +{
    + struct wis_tw2804 *state = to_state_from_ctrl(ctrl);
    + struct v4l2_subdev *sd = &state->sd;
    + struct i2c_client *client = v4l2_get_subdevdata(sd);
    + s32 reg = ctrl->val;
    + s32 addr = get_ctrl_addr(ctrl->id);
    +
    + if (addr == -EINVAL)
    + return -EINVAL;
    +
    + switch (ctrl->id) {
    + case V4L2_CID_AUTOGAIN:
    + reg = read_reg(client, addr, state->channel);
    + if (reg > 0) {
    + if (ctrl->val == 0)
    + reg &= ~(1<<7);
    + else
    + reg |= 1<<7;
    + } else
    + return reg;
    + break;
    + case V4L2_CID_COLOR_KILLER:
    + reg = read_reg(client, addr, state->channel);
    + if (reg > 0)
    + reg = (reg & ~(0x03)) | (ctrl->val == 0 ? 0x02 : 0x03);
    + else
    + return reg;
    + break;
    + default:
    + break;
    + }
    +
    + reg = reg > 255 ? 255 : (reg < 0 ? 0 : reg);
    + reg = write_reg(client, addr, (u8)reg,
    + ctrl->id == V4L2_CID_GAIN ||
    + ctrl->id == V4L2_CID_CHROMA_GAIN ||
    + ctrl->id == V4L2_CID_RED_BALANCE ||
    + ctrl->id == V4L2_CID_BLUE_BALANCE ? 0 : state->channel);
    +
    + if (reg < 0) {
    + v4l2_err(sd, "Can`t set_ctrl value:id=%d;value=%d\n", ctrl->id,
    + ctrl->val);
    + return reg;
    + }
    + return 0;
    +}
    +
    +static int tw2804_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
    +{
    + struct wis_tw2804 *dec = to_state(sd);
    + struct i2c_client *client = v4l2_get_subdevdata(sd);
    +
    + u8 regs[] = {
    + 0x01, norm&V4L2_STD_NTSC ? 0xc4 : 0x84,
    + 0x09, norm&V4L2_STD_NTSC ? 0x07 : 0x04,
    + 0x0a, norm&V4L2_STD_NTSC ? 0xf0 : 0x20,
    + 0x0b, norm&V4L2_STD_NTSC ? 0x07 : 0x04,
    + 0x0c, norm&V4L2_STD_NTSC ? 0xf0 : 0x20,
    + 0x0d, norm&V4L2_STD_NTSC ? 0x40 : 0x4a,
    + 0x16, norm&V4L2_STD_NTSC ? 0x00 : 0x40,
    + 0x17, norm&V4L2_STD_NTSC ? 0x00 : 0x40,
    + 0x20, norm&V4L2_STD_NTSC ? 0x07 : 0x0f,
    + 0x21, norm&V4L2_STD_NTSC ? 0x07 : 0x0f,
    + 0xff, 0xff,
    + };
    + write_regs(client, regs, dec->channel);
    + dec->norm = norm;
    + return 0;
    +}
    +
    +static int tw2804_g_chip_ident(struct v4l2_subdev *sd,
    + struct v4l2_dbg_chip_ident *chip)
    +{
    + struct i2c_client *client = v4l2_get_subdevdata(sd);
    + return v4l2_chip_ident_i2c_client(client, chip,
    + V4L2_IDENT_TW2804, 0x0e);
    +}
    +
    +static const struct v4l2_ctrl_ops tw2804_ctrl_ops = {
    + .g_volatile_ctrl = tw2804_g_volatile_ctrl,
    + .s_ctrl = tw2804_s_ctrl,
    +};
    +
    +static const struct v4l2_subdev_core_ops tw2804_core_ops = {
    + .log_status = tw2804_log_status,
    + .g_chip_ident = tw2804_g_chip_ident,
    + .g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
    + .try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
    + .s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
    + .g_ctrl = v4l2_subdev_g_ctrl,
    + .s_ctrl = v4l2_subdev_s_ctrl,
    + .queryctrl = v4l2_subdev_queryctrl,
    + .querymenu = v4l2_subdev_querymenu,
    + .s_std = tw2804_s_std,
    +};
    +
    +static int tw2804_s_video_routing(struct v4l2_subdev *sd, u32 input, u32 output,
    + u32 config)
    +{
    + struct wis_tw2804 *dec = to_state(sd);
    + struct i2c_client *client = v4l2_get_subdevdata(sd);
    + s32 reg = 0;
    +
    + if (0 > input || input > 1)
    + return -EINVAL;
    +
    + if (input == dec->input)
    + return 0;
    +
    + reg = read_reg(client, 0x22, dec->channel);
    +
    + if (reg >= 0) {
    + if (input == 0)
    + reg &= ~(1<<2);
    + else
    + reg |= 1<<2;
    + reg = write_reg(client, 0x22, (u8)reg, dec->channel);
    + }
    +
    + if (reg >= 0)
    + dec->input = input;
    + else
    + return reg;
    return 0;
    }

    +static int tw2804_s_mbus_fmt(struct v4l2_subdev *sd,
    + struct v4l2_mbus_framefmt *fmt)
    +{
    + /*TODO need select between 3fmt:
    + * bt_656,
    + * bt_601_8bit,
    + * bt_656_dual,
    + */
    + return 0;
    +}
    +
    +static int tw2804_s_stream(struct v4l2_subdev *sd, int enable)
    +{
    + struct wis_tw2804 *dec = to_state(sd);
    + struct i2c_client *client = v4l2_get_subdevdata(sd);
    + u32 reg = read_reg(client, 0x78, 0);
    +
    + if (enable == 1)
    + write_reg(client, 0x78, reg & ~(1<<dec->channel), 0);
    + else
    + write_reg(client, 0x78, reg | (1<<dec->channel), 0);
    +
    + return 0;
    +}
    +
    +static const struct v4l2_subdev_video_ops tw2804_video_ops = {
    + .s_routing = tw2804_s_video_routing,
    + .s_mbus_fmt = tw2804_s_mbus_fmt,
    + .s_stream = tw2804_s_stream,
    +};
    +
    +static const struct v4l2_subdev_ops tw2804_ops = {
    + .core = &tw2804_core_ops,
    + .video = &tw2804_video_ops,
    +};
    +
    static int wis_tw2804_command(struct i2c_client *client,
    unsigned int cmd, void *arg)
    {
    @@ -355,3 +600,6 @@ module_init(wis_tw2804_init);
    module_exit(wis_tw2804_cleanup);

    MODULE_LICENSE("GPL v2");
    +MODULE_DESCRIPTION("TW2804/TW2802 V4L2 i2c driver");
    +MODULE_AUTHOR("Volokh Konstantin <volokh84@gmail.com>");
    +MODULE_AUTHOR("Micronas USA Inc");
    --
    1.7.7.6


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