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			     const struct i2c_device_id *id)
162{
163	struct tw9906 *dec;
164	struct v4l2_subdev *sd;
165	struct v4l2_ctrl_handler *hdl;
166
167	/* Check if the adapter supports the needed features */
168	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
169		return -EIO;
170
171	v4l_info(client, "chip found @ 0x%02x (%s)\n",
172			client->addr << 1, client->adapter->name);
173
174	dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
175	if (dec == NULL)
176		return -ENOMEM;
177	sd = &dec->sd;
178	v4l2_i2c_subdev_init(sd, client, &tw9906_ops);
179	hdl = &dec->hdl;
180	v4l2_ctrl_handler_init(hdl, 4);
181	v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
182		V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
183	v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
184		V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
185	v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
186		V4L2_CID_HUE, -128, 127, 1, 0);
187	sd->ctrl_handler = hdl;
188	if (hdl->error) {
189		int err = hdl->error;
190
191		v4l2_ctrl_handler_free(hdl);
192		return err;
193	}
194
195	/* Initialize tw9906 */
196	dec->norm = V4L2_STD_NTSC;
197
198	if (write_regs(sd, initial_registers) < 0) {
199		v4l2_err(client, "error initializing TW9906\n");
200		return -EINVAL;
201	}
202
203	return 0;
204}
205
206static int 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	return 0;
213}
214
215/* ----------------------------------------------------------------------- */
216
217static const struct i2c_device_id tw9906_id[] = {
218	{ "tw9906", 0 },
219	{ }
220};
221MODULE_DEVICE_TABLE(i2c, tw9906_id);
222
223static struct i2c_driver tw9906_driver = {
224	.driver = {
225		.name	= "tw9906",
226	},
227	.probe = tw9906_probe,
228	.remove = tw9906_remove,
229	.id_table = tw9906_id,
230};
231module_i2c_driver(tw9906_driver);
232