245 lines
5.7 KiB
C
245 lines
5.7 KiB
C
/*
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* Copyright (C) 2005-2006 Micronas USA Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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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 <linux/slab.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ctrls.h>
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MODULE_DESCRIPTION("TW9906 I2C subdev driver");
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MODULE_LICENSE("GPL v2");
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struct tw9906 {
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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 tw9906 *to_state(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct tw9906, sd);
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}
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static const u8 initial_registers[] = {
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0x02, 0x40, /* input 0, composite */
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0x03, 0xa2, /* correct digital format */
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0x05, 0x81, /* or 0x01 for PAL */
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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, 0x10, /* window */
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0x0b, 0xd0, /* window */
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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, 0x11, /* sharpness */
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0x13, 0x7e, /* U gain */
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0x14, 0x7e, /* V gain */
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0x15, 0x00, /* hue */
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0x19, 0x57, /* vbi */
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0x1a, 0x0f,
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0x1b, 0x40,
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0x29, 0x03,
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0x55, 0x00,
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0x6b, 0x26,
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0x6c, 0x36,
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0x6d, 0xf0,
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0x6e, 0x41,
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0x6f, 0x13,
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0xad, 0x70,
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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 tw9906_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 tw9906_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
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{
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struct tw9906 *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, 0x81,
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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, 0x01,
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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 tw9906_s_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct tw9906 *dec = container_of(ctrl->handler, struct tw9906, 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 tw9906_log_status(struct v4l2_subdev *sd)
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{
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struct tw9906 *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 tw9906_ctrl_ops = {
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.s_ctrl = tw9906_s_ctrl,
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};
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static const struct v4l2_subdev_core_ops tw9906_core_ops = {
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.log_status = tw9906_log_status,
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};
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static const struct v4l2_subdev_video_ops tw9906_video_ops = {
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.s_std = tw9906_s_std,
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.s_routing = tw9906_s_video_routing,
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};
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static const struct v4l2_subdev_ops tw9906_ops = {
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.core = &tw9906_core_ops,
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.video = &tw9906_video_ops,
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};
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static int tw9906_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct tw9906 *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, &tw9906_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, &tw9906_ctrl_ops,
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V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
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v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
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V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
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v4l2_ctrl_new_std(hdl, &tw9906_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 tw9906 */
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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 TW9906\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 int tw9906_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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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static const struct i2c_device_id tw9906_id[] = {
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{ "tw9906", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tw9906_id);
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static struct i2c_driver tw9906_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "tw9906",
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},
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.probe = tw9906_probe,
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.remove = tw9906_remove,
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.id_table = tw9906_id,
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};
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module_i2c_driver(tw9906_driver);
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