438 lines
10 KiB
C
438 lines
10 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 <linux/slab.h>
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#include <media/v4l2-subdev.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ctrls.h>
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#define TW2804_REG_AUTOGAIN 0x02
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#define TW2804_REG_HUE 0x0f
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#define TW2804_REG_SATURATION 0x10
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#define TW2804_REG_CONTRAST 0x11
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#define TW2804_REG_BRIGHTNESS 0x12
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#define TW2804_REG_COLOR_KILLER 0x14
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#define TW2804_REG_GAIN 0x3c
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#define TW2804_REG_CHROMA_GAIN 0x3d
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#define TW2804_REG_BLUE_BALANCE 0x3e
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#define TW2804_REG_RED_BALANCE 0x3f
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struct tw2804 {
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struct v4l2_subdev sd;
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struct v4l2_ctrl_handler hdl;
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u8 channel:2;
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u8 input:1;
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int norm;
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};
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static const u8 global_registers[] = {
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0x39, 0x00,
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0x3a, 0xff,
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0x3b, 0x84,
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0x3c, 0x80,
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0x3d, 0x80,
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0x3e, 0x82,
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0x3f, 0x82,
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0x78, 0x00,
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0xff, 0xff, /* Terminator (reg 0xff does not exist) */
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};
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static const u8 channel_registers[] = {
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0x01, 0xc4,
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0x02, 0xa5,
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0x03, 0x20,
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0x04, 0xd0,
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0x05, 0x20,
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0x06, 0xd0,
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0x07, 0x88,
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0x08, 0x20,
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0x09, 0x07,
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0x0a, 0xf0,
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0x0b, 0x07,
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0x0c, 0xf0,
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0x0d, 0x40,
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0x0e, 0xd2,
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0x0f, 0x80,
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0x10, 0x80,
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0x11, 0x80,
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0x12, 0x80,
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0x13, 0x1f,
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0x14, 0x00,
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0x15, 0x00,
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0x16, 0x00,
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0x17, 0x00,
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0x18, 0xff,
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0x19, 0xff,
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0x1a, 0xff,
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0x1b, 0xff,
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0x1c, 0xff,
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0x1d, 0xff,
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0x1e, 0xff,
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0x1f, 0xff,
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0x20, 0x07,
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0x21, 0x07,
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0x22, 0x00,
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0x23, 0x91,
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0x24, 0x51,
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0x25, 0x03,
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0x26, 0x00,
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0x27, 0x00,
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0x28, 0x00,
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0x29, 0x00,
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0x2a, 0x00,
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0x2b, 0x00,
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0x2c, 0x00,
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0x2d, 0x00,
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0x2e, 0x00,
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0x2f, 0x00,
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0x30, 0x00,
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0x31, 0x00,
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0x32, 0x00,
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0x33, 0x00,
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0x34, 0x00,
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0x35, 0x00,
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0x36, 0x00,
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0x37, 0x00,
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0xff, 0xff, /* Terminator (reg 0xff does not exist) */
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};
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static int write_reg(struct i2c_client *client, u8 reg, u8 value, u8 channel)
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{
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return i2c_smbus_write_byte_data(client, reg | (channel << 6), value);
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}
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static int write_regs(struct i2c_client *client, const u8 *regs, u8 channel)
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{
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int ret;
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int i;
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for (i = 0; regs[i] != 0xff; i += 2) {
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ret = i2c_smbus_write_byte_data(client,
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regs[i] | (channel << 6), regs[i + 1]);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static int read_reg(struct i2c_client *client, u8 reg, u8 channel)
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{
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return i2c_smbus_read_byte_data(client, (reg) | (channel << 6));
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}
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static inline struct tw2804 *to_state(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct tw2804, sd);
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}
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static inline struct tw2804 *to_state_from_ctrl(struct v4l2_ctrl *ctrl)
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{
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return container_of(ctrl->handler, struct tw2804, hdl);
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}
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static int tw2804_log_status(struct v4l2_subdev *sd)
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{
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struct tw2804 *state = to_state(sd);
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v4l2_info(sd, "Standard: %s\n",
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state->norm & V4L2_STD_525_60 ? "60 Hz" : "50 Hz");
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v4l2_info(sd, "Channel: %d\n", state->channel);
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v4l2_info(sd, "Input: %d\n", state->input);
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return v4l2_ctrl_subdev_log_status(sd);
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}
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/*
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* These volatile controls are needed because all four channels share
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* these controls. So a change made to them through one channel would
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* require another channel to be updated.
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*
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* Normally this would have been done in a different way, but since the one
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* board that uses this driver sees this single chip as if it was on four
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* different i2c adapters (each adapter belonging to a separate instance of
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* the same USB driver) there is no reliable method that I have found to let
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* the instances know about each other.
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*
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* So implementing these global registers as volatile is the best we can do.
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*/
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static int tw2804_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct tw2804 *state = to_state_from_ctrl(ctrl);
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struct i2c_client *client = v4l2_get_subdevdata(&state->sd);
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switch (ctrl->id) {
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case V4L2_CID_GAIN:
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ctrl->val = read_reg(client, TW2804_REG_GAIN, 0);
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return 0;
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case V4L2_CID_CHROMA_GAIN:
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ctrl->val = read_reg(client, TW2804_REG_CHROMA_GAIN, 0);
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return 0;
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case V4L2_CID_BLUE_BALANCE:
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ctrl->val = read_reg(client, TW2804_REG_BLUE_BALANCE, 0);
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return 0;
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case V4L2_CID_RED_BALANCE:
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ctrl->val = read_reg(client, TW2804_REG_RED_BALANCE, 0);
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return 0;
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}
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return 0;
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}
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static int tw2804_s_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct tw2804 *state = to_state_from_ctrl(ctrl);
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struct i2c_client *client = v4l2_get_subdevdata(&state->sd);
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int addr;
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int reg;
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switch (ctrl->id) {
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case V4L2_CID_AUTOGAIN:
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addr = TW2804_REG_AUTOGAIN;
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reg = read_reg(client, addr, state->channel);
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if (reg < 0)
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return reg;
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if (ctrl->val == 0)
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reg &= ~(1 << 7);
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else
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reg |= 1 << 7;
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return write_reg(client, addr, reg, state->channel);
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case V4L2_CID_COLOR_KILLER:
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addr = TW2804_REG_COLOR_KILLER;
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reg = read_reg(client, addr, state->channel);
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if (reg < 0)
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return reg;
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reg = (reg & ~(0x03)) | (ctrl->val == 0 ? 0x02 : 0x03);
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return write_reg(client, addr, reg, state->channel);
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case V4L2_CID_GAIN:
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return write_reg(client, TW2804_REG_GAIN, ctrl->val, 0);
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case V4L2_CID_CHROMA_GAIN:
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return write_reg(client, TW2804_REG_CHROMA_GAIN, ctrl->val, 0);
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case V4L2_CID_BLUE_BALANCE:
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return write_reg(client, TW2804_REG_BLUE_BALANCE, ctrl->val, 0);
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case V4L2_CID_RED_BALANCE:
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return write_reg(client, TW2804_REG_RED_BALANCE, ctrl->val, 0);
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case V4L2_CID_BRIGHTNESS:
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return write_reg(client, TW2804_REG_BRIGHTNESS,
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ctrl->val, state->channel);
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case V4L2_CID_CONTRAST:
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return write_reg(client, TW2804_REG_CONTRAST,
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ctrl->val, state->channel);
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case V4L2_CID_SATURATION:
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return write_reg(client, TW2804_REG_SATURATION,
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ctrl->val, state->channel);
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case V4L2_CID_HUE:
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return write_reg(client, TW2804_REG_HUE,
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ctrl->val, state->channel);
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default:
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break;
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}
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return -EINVAL;
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}
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static int tw2804_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
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{
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struct tw2804 *dec = to_state(sd);
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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bool is_60hz = norm & V4L2_STD_525_60;
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u8 regs[] = {
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0x01, is_60hz ? 0xc4 : 0x84,
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0x09, is_60hz ? 0x07 : 0x04,
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0x0a, is_60hz ? 0xf0 : 0x20,
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0x0b, is_60hz ? 0x07 : 0x04,
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0x0c, is_60hz ? 0xf0 : 0x20,
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0x0d, is_60hz ? 0x40 : 0x4a,
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0x16, is_60hz ? 0x00 : 0x40,
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0x17, is_60hz ? 0x00 : 0x40,
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0x20, is_60hz ? 0x07 : 0x0f,
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0x21, is_60hz ? 0x07 : 0x0f,
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0xff, 0xff,
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};
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write_regs(client, regs, dec->channel);
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dec->norm = norm;
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return 0;
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}
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static int tw2804_s_video_routing(struct v4l2_subdev *sd, u32 input, u32 output,
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u32 config)
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{
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struct tw2804 *dec = to_state(sd);
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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int reg;
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if (config && config - 1 != dec->channel) {
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if (config > 4) {
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dev_err(&client->dev,
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"channel %d is not between 1 and 4!\n", config);
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return -EINVAL;
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}
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dec->channel = config - 1;
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dev_dbg(&client->dev, "initializing TW2804 channel %d\n",
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dec->channel);
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if (dec->channel == 0 &&
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write_regs(client, global_registers, 0) < 0) {
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dev_err(&client->dev,
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"error initializing TW2804 global registers\n");
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return -EIO;
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}
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if (write_regs(client, channel_registers, dec->channel) < 0) {
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dev_err(&client->dev,
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"error initializing TW2804 channel %d\n",
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dec->channel);
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return -EIO;
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}
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}
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if (input > 1)
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return -EINVAL;
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if (input == dec->input)
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return 0;
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reg = read_reg(client, 0x22, dec->channel);
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if (reg >= 0) {
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if (input == 0)
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reg &= ~(1 << 2);
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else
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reg |= 1 << 2;
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reg = write_reg(client, 0x22, reg, dec->channel);
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}
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if (reg >= 0)
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dec->input = input;
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else
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return reg;
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return 0;
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}
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static const struct v4l2_ctrl_ops tw2804_ctrl_ops = {
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.g_volatile_ctrl = tw2804_g_volatile_ctrl,
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.s_ctrl = tw2804_s_ctrl,
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};
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static const struct v4l2_subdev_video_ops tw2804_video_ops = {
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.s_std = tw2804_s_std,
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.s_routing = tw2804_s_video_routing,
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};
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static const struct v4l2_subdev_core_ops tw2804_core_ops = {
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.log_status = tw2804_log_status,
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};
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static const struct v4l2_subdev_ops tw2804_ops = {
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.core = &tw2804_core_ops,
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.video = &tw2804_video_ops,
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};
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static int tw2804_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct i2c_adapter *adapter = client->adapter;
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struct tw2804 *state;
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struct v4l2_subdev *sd;
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struct v4l2_ctrl *ctrl;
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int err;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
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if (state == NULL)
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return -ENOMEM;
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sd = &state->sd;
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v4l2_i2c_subdev_init(sd, client, &tw2804_ops);
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state->channel = -1;
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state->norm = V4L2_STD_NTSC;
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v4l2_ctrl_handler_init(&state->hdl, 10);
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v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
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V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
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v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
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V4L2_CID_CONTRAST, 0, 255, 1, 128);
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v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
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V4L2_CID_SATURATION, 0, 255, 1, 128);
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v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
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V4L2_CID_HUE, 0, 255, 1, 128);
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v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
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V4L2_CID_COLOR_KILLER, 0, 1, 1, 0);
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v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
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V4L2_CID_AUTOGAIN, 0, 1, 1, 0);
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ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
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V4L2_CID_GAIN, 0, 255, 1, 128);
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if (ctrl)
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ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
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ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
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V4L2_CID_CHROMA_GAIN, 0, 255, 1, 128);
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if (ctrl)
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ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
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ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
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V4L2_CID_BLUE_BALANCE, 0, 255, 1, 122);
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if (ctrl)
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ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
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ctrl = v4l2_ctrl_new_std(&state->hdl, &tw2804_ctrl_ops,
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V4L2_CID_RED_BALANCE, 0, 255, 1, 122);
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if (ctrl)
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ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
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sd->ctrl_handler = &state->hdl;
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err = state->hdl.error;
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if (err) {
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v4l2_ctrl_handler_free(&state->hdl);
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return err;
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}
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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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return 0;
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}
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static int tw2804_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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struct tw2804 *state = to_state(sd);
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v4l2_device_unregister_subdev(sd);
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v4l2_ctrl_handler_free(&state->hdl);
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return 0;
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}
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static const struct i2c_device_id tw2804_id[] = {
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{ "tw2804", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tw2804_id);
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static struct i2c_driver tw2804_driver = {
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.driver = {
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.name = "tw2804",
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},
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.probe = tw2804_probe,
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.remove = tw2804_remove,
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.id_table = tw2804_id,
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};
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module_i2c_driver(tw2804_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("TW2804/TW2802 V4L2 i2c driver");
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MODULE_AUTHOR("Micronas USA Inc");
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