262 lines
6.0 KiB
C
262 lines
6.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2005-2006 Micronas USA Inc.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/videodev2.h>
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#include <linux/ioctl.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ctrls.h>
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#include <linux/slab.h>
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MODULE_DESCRIPTION("TW9903 I2C subdev driver");
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MODULE_LICENSE("GPL v2");
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/*
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* This driver is based on the wis-tw9903.c source that was in
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* drivers/staging/media/go7007. That source had commented out code for
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* saturation and scaling (neither seemed to work). If anyone ever gets
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* hardware to test this driver, then that code might be useful to look at.
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* You need to get the kernel sources of, say, kernel 3.8 where that
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* wis-tw9903 driver is still present.
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*/
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struct tw9903 {
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struct v4l2_subdev sd;
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struct v4l2_ctrl_handler hdl;
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v4l2_std_id norm;
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};
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static inline struct tw9903 *to_state(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct tw9903, sd);
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}
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static const u8 initial_registers[] = {
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0x02, 0x44, /* input 1, composite */
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0x03, 0x92, /* correct digital format */
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0x04, 0x00,
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0x05, 0x80, /* or 0x00 for PAL */
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0x06, 0x40, /* second internal current reference */
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0x07, 0x02, /* window */
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0x08, 0x14, /* window */
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0x09, 0xf0, /* window */
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0x0a, 0x81, /* window */
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0x0b, 0xd0, /* window */
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0x0c, 0x8c,
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0x0d, 0x00, /* scaling */
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0x0e, 0x11, /* scaling */
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0x0f, 0x00, /* scaling */
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0x10, 0x00, /* brightness */
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0x11, 0x60, /* contrast */
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0x12, 0x01, /* sharpness */
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0x13, 0x7f, /* U gain */
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0x14, 0x5a, /* V gain */
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0x15, 0x00, /* hue */
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0x16, 0xc3, /* sharpness */
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0x18, 0x00,
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0x19, 0x58, /* vbi */
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0x1a, 0x80,
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0x1c, 0x0f, /* video norm */
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0x1d, 0x7f, /* video norm */
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0x20, 0xa0, /* clamping gain (working 0x50) */
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0x21, 0x22,
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0x22, 0xf0,
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0x23, 0xfe,
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0x24, 0x3c,
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0x25, 0x38,
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0x26, 0x44,
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0x27, 0x20,
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0x28, 0x00,
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0x29, 0x15,
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0x2a, 0xa0,
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0x2b, 0x44,
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0x2c, 0x37,
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0x2d, 0x00,
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0x2e, 0xa5, /* burst PLL control (working: a9) */
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0x2f, 0xe0, /* 0xea is blue test frame -- 0xe0 for normal */
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0x31, 0x00,
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0x33, 0x22,
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0x34, 0x11,
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0x35, 0x35,
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0x3b, 0x05,
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0x06, 0xc0, /* reset device */
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0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
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};
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static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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return i2c_smbus_write_byte_data(client, reg, value);
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}
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static int write_regs(struct v4l2_subdev *sd, const u8 *regs)
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{
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int i;
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for (i = 0; regs[i] != 0x00; i += 2)
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if (write_reg(sd, regs[i], regs[i + 1]) < 0)
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return -1;
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return 0;
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}
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static int tw9903_s_video_routing(struct v4l2_subdev *sd, u32 input,
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u32 output, u32 config)
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{
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write_reg(sd, 0x02, 0x40 | (input << 1));
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return 0;
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}
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static int tw9903_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
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{
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struct tw9903 *dec = to_state(sd);
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bool is_60hz = norm & V4L2_STD_525_60;
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static const u8 config_60hz[] = {
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0x05, 0x80,
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0x07, 0x02,
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0x08, 0x14,
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0x09, 0xf0,
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0, 0,
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};
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static const u8 config_50hz[] = {
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0x05, 0x00,
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0x07, 0x12,
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0x08, 0x18,
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0x09, 0x20,
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0, 0,
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};
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write_regs(sd, is_60hz ? config_60hz : config_50hz);
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dec->norm = norm;
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return 0;
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}
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static int tw9903_s_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct tw9903 *dec = container_of(ctrl->handler, struct tw9903, hdl);
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struct v4l2_subdev *sd = &dec->sd;
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switch (ctrl->id) {
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case V4L2_CID_BRIGHTNESS:
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write_reg(sd, 0x10, ctrl->val);
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break;
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case V4L2_CID_CONTRAST:
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write_reg(sd, 0x11, ctrl->val);
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break;
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case V4L2_CID_HUE:
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write_reg(sd, 0x15, ctrl->val);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int tw9903_log_status(struct v4l2_subdev *sd)
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{
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struct tw9903 *dec = to_state(sd);
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bool is_60hz = dec->norm & V4L2_STD_525_60;
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v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
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v4l2_ctrl_subdev_log_status(sd);
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return 0;
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}
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/* --------------------------------------------------------------------------*/
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static const struct v4l2_ctrl_ops tw9903_ctrl_ops = {
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.s_ctrl = tw9903_s_ctrl,
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};
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static const struct v4l2_subdev_core_ops tw9903_core_ops = {
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.log_status = tw9903_log_status,
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};
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static const struct v4l2_subdev_video_ops tw9903_video_ops = {
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.s_std = tw9903_s_std,
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.s_routing = tw9903_s_video_routing,
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};
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static const struct v4l2_subdev_ops tw9903_ops = {
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.core = &tw9903_core_ops,
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.video = &tw9903_video_ops,
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};
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/* --------------------------------------------------------------------------*/
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static int tw9903_probe(struct i2c_client *client)
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{
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struct tw9903 *dec;
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struct v4l2_subdev *sd;
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struct v4l2_ctrl_handler *hdl;
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/* Check if the adapter supports the needed features */
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -EIO;
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v4l_info(client, "chip found @ 0x%02x (%s)\n",
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client->addr << 1, client->adapter->name);
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dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
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if (dec == NULL)
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return -ENOMEM;
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sd = &dec->sd;
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v4l2_i2c_subdev_init(sd, client, &tw9903_ops);
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hdl = &dec->hdl;
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v4l2_ctrl_handler_init(hdl, 4);
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v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
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V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
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v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
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V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
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v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
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V4L2_CID_HUE, -128, 127, 1, 0);
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sd->ctrl_handler = hdl;
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if (hdl->error) {
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int err = hdl->error;
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v4l2_ctrl_handler_free(hdl);
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return err;
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}
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/* Initialize tw9903 */
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dec->norm = V4L2_STD_NTSC;
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if (write_regs(sd, initial_registers) < 0) {
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v4l2_err(client, "error initializing TW9903\n");
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return -EINVAL;
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}
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return 0;
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}
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static void tw9903_remove(struct i2c_client *client)
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{
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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v4l2_device_unregister_subdev(sd);
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v4l2_ctrl_handler_free(&to_state(sd)->hdl);
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}
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/* ----------------------------------------------------------------------- */
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static const struct i2c_device_id tw9903_id[] = {
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{ "tw9903" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tw9903_id);
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static struct i2c_driver tw9903_driver = {
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.driver = {
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.name = "tw9903",
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},
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.probe = tw9903_probe,
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.remove = tw9903_remove,
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.id_table = tw9903_id,
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};
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module_i2c_driver(tw9903_driver);
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