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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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2958d579ff
While being less compact, using named initializers allows to more easily see which members of the structs are assigned which value without having to lookup the declaration of the struct. And it's also more robust against changes to the struct definition. The mentioned robustness is relevant for a planned change to struct i2c_device_id that replaces .driver_data by an anonymous union. While touching all these arrays, unify usage of whitespace and commas. This patch doesn't modify the compiled arrays, only their representation in source form benefits. The former was confirmed with x86 and arm64 builds. Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com> Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
263 lines
6.0 KiB
C
263 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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v4l2_ctrl_handler_free(hdl);
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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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{ .name = "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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