tw9906.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2005-2006 Micronas USA Inc.
  4 */
  5
  6#include <linux/module.h>
  7#include <linux/init.h>
  8#include <linux/i2c.h>
  9#include <linux/videodev2.h>
 10#include <linux/ioctl.h>
 11#include <linux/slab.h>
 12#include <media/v4l2-device.h>
 13#include <media/v4l2-ctrls.h>
 14
 15MODULE_DESCRIPTION("TW9906 I2C subdev driver");
 16MODULE_LICENSE("GPL v2");
 17
 18struct tw9906 {
 19	struct v4l2_subdev sd;
 20	struct v4l2_ctrl_handler hdl;
 21	v4l2_std_id norm;
 22};
 23
 24static inline struct tw9906 *to_state(struct v4l2_subdev *sd)
 25{
 26	return container_of(sd, struct tw9906, sd);
 27}
 28
 29static const u8 initial_registers[] = {
 30	0x02, 0x40, /* input 0, composite */
 31	0x03, 0xa2, /* correct digital format */
 32	0x05, 0x81, /* or 0x01 for PAL */
 33	0x07, 0x02, /* window */
 34	0x08, 0x14, /* window */
 35	0x09, 0xf0, /* window */
 36	0x0a, 0x10, /* window */
 37	0x0b, 0xd0, /* window */
 38	0x0d, 0x00, /* scaling */
 39	0x0e, 0x11, /* scaling */
 40	0x0f, 0x00, /* scaling */
 41	0x10, 0x00, /* brightness */
 42	0x11, 0x60, /* contrast */
 43	0x12, 0x11, /* sharpness */
 44	0x13, 0x7e, /* U gain */
 45	0x14, 0x7e, /* V gain */
 46	0x15, 0x00, /* hue */
 47	0x19, 0x57, /* vbi */
 48	0x1a, 0x0f,
 49	0x1b, 0x40,
 50	0x29, 0x03,
 51	0x55, 0x00,
 52	0x6b, 0x26,
 53	0x6c, 0x36,
 54	0x6d, 0xf0,
 55	0x6e, 0x41,
 56	0x6f, 0x13,
 57	0xad, 0x70,
 58	0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
 59};
 60
 61static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
 62{
 63	struct i2c_client *client = v4l2_get_subdevdata(sd);
 64
 65	return i2c_smbus_write_byte_data(client, reg, value);
 66}
 67
 68static int write_regs(struct v4l2_subdev *sd, const u8 *regs)
 69{
 70	int i;
 71
 72	for (i = 0; regs[i] != 0x00; i += 2)
 73		if (write_reg(sd, regs[i], regs[i + 1]) < 0)
 74			return -1;
 75	return 0;
 76}
 77
 78static int tw9906_s_video_routing(struct v4l2_subdev *sd, u32 input,
 79				      u32 output, u32 config)
 80{
 81	write_reg(sd, 0x02, 0x40 | (input << 1));
 82	return 0;
 83}
 84
 85static int tw9906_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
 86{
 87	struct tw9906 *dec = to_state(sd);
 88	bool is_60hz = norm & V4L2_STD_525_60;
 89	static const u8 config_60hz[] = {
 90		0x05, 0x81,
 91		0x07, 0x02,
 92		0x08, 0x14,
 93		0x09, 0xf0,
 94		0,    0,
 95	};
 96	static const u8 config_50hz[] = {
 97		0x05, 0x01,
 98		0x07, 0x12,
 99		0x08, 0x18,
100		0x09, 0x20,
101		0,    0,
102	};
103
104	write_regs(sd, is_60hz ? config_60hz : config_50hz);
105	dec->norm = norm;
106	return 0;
107}
108
109static int tw9906_s_ctrl(struct v4l2_ctrl *ctrl)
110{
111	struct tw9906 *dec = container_of(ctrl->handler, struct tw9906, hdl);
112	struct v4l2_subdev *sd = &dec->sd;
113
114	switch (ctrl->id) {
115	case V4L2_CID_BRIGHTNESS:
116		write_reg(sd, 0x10, ctrl->val);
117		break;
118	case V4L2_CID_CONTRAST:
119		write_reg(sd, 0x11, ctrl->val);
120		break;
121	case V4L2_CID_HUE:
122		write_reg(sd, 0x15, ctrl->val);
123		break;
124	default:
125		return -EINVAL;
126	}
127	return 0;
128}
129
130static int tw9906_log_status(struct v4l2_subdev *sd)
131{
132	struct tw9906 *dec = to_state(sd);
133	bool is_60hz = dec->norm & V4L2_STD_525_60;
134
135	v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
136	v4l2_ctrl_subdev_log_status(sd);
137	return 0;
138}
139
140/* --------------------------------------------------------------------------*/
141
142static const struct v4l2_ctrl_ops tw9906_ctrl_ops = {
143	.s_ctrl = tw9906_s_ctrl,
144};
145
146static const struct v4l2_subdev_core_ops tw9906_core_ops = {
147	.log_status = tw9906_log_status,
148};
149
150static const struct v4l2_subdev_video_ops tw9906_video_ops = {
151	.s_std = tw9906_s_std,
152	.s_routing = tw9906_s_video_routing,
153};
154
155static const struct v4l2_subdev_ops tw9906_ops = {
156	.core = &tw9906_core_ops,
157	.video = &tw9906_video_ops,
158};
159
160static int tw9906_probe(struct i2c_client *client)
161{
162	struct tw9906 *dec;
163	struct v4l2_subdev *sd;
164	struct v4l2_ctrl_handler *hdl;
165
166	/* Check if the adapter supports the needed features */
167	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
168		return -EIO;
169
170	v4l_info(client, "chip found @ 0x%02x (%s)\n",
171			client->addr << 1, client->adapter->name);
172
173	dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
174	if (dec == NULL)
175		return -ENOMEM;
176	sd = &dec->sd;
177	v4l2_i2c_subdev_init(sd, client, &tw9906_ops);
178	hdl = &dec->hdl;
179	v4l2_ctrl_handler_init(hdl, 4);
180	v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
181		V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
182	v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
183		V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
184	v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
185		V4L2_CID_HUE, -128, 127, 1, 0);
186	sd->ctrl_handler = hdl;
187	if (hdl->error) {
188		int err = hdl->error;
189
190		v4l2_ctrl_handler_free(hdl);
191		return err;
192	}
193
194	/* Initialize tw9906 */
195	dec->norm = V4L2_STD_NTSC;
196
197	if (write_regs(sd, initial_registers) < 0) {
198		v4l2_err(client, "error initializing TW9906\n");
199		v4l2_ctrl_handler_free(hdl);
200		return -EINVAL;
201	}
202
203	return 0;
204}
205
206static void tw9906_remove(struct i2c_client *client)
207{
208	struct v4l2_subdev *sd = i2c_get_clientdata(client);
209
210	v4l2_device_unregister_subdev(sd);
211	v4l2_ctrl_handler_free(&to_state(sd)->hdl);
212}
213
214/* ----------------------------------------------------------------------- */
215
216static const struct i2c_device_id tw9906_id[] = {
217	{ "tw9906" },
218	{ }
219};
220MODULE_DEVICE_TABLE(i2c, tw9906_id);
221
222static struct i2c_driver tw9906_driver = {
223	.driver = {
224		.name	= "tw9906",
225	},
226	.probe = tw9906_probe,
227	.remove = tw9906_remove,
228	.id_table = tw9906_id,
229};
230module_i2c_driver(tw9906_driver);