1/*
2 * Copyright (C) 2005-2006 Micronas USA Inc.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License (Version 2) as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software Foundation,
15 * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
16 */
17
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/i2c.h>
21#include <linux/videodev2.h>
22#include <linux/ioctl.h>
23#include <linux/slab.h>
24#include <media/v4l2-device.h>
25#include <media/v4l2-ctrls.h>
26
27MODULE_DESCRIPTION("TW9906 I2C subdev driver");
28MODULE_LICENSE("GPL v2");
29
30struct tw9906 {
31	struct v4l2_subdev sd;
32	struct v4l2_ctrl_handler hdl;
33	v4l2_std_id norm;
34};
35
36static inline struct tw9906 *to_state(struct v4l2_subdev *sd)
37{
38	return container_of(sd, struct tw9906, sd);
39}
40
41static const u8 initial_registers[] = {
42	0x02, 0x40, /* input 0, composite */
43	0x03, 0xa2, /* correct digital format */
44	0x05, 0x81, /* or 0x01 for PAL */
45	0x07, 0x02, /* window */
46	0x08, 0x14, /* window */
47	0x09, 0xf0, /* window */
48	0x0a, 0x10, /* window */
49	0x0b, 0xd0, /* window */
50	0x0d, 0x00, /* scaling */
51	0x0e, 0x11, /* scaling */
52	0x0f, 0x00, /* scaling */
53	0x10, 0x00, /* brightness */
54	0x11, 0x60, /* contrast */
55	0x12, 0x11, /* sharpness */
56	0x13, 0x7e, /* U gain */
57	0x14, 0x7e, /* V gain */
58	0x15, 0x00, /* hue */
59	0x19, 0x57, /* vbi */
60	0x1a, 0x0f,
61	0x1b, 0x40,
62	0x29, 0x03,
63	0x55, 0x00,
64	0x6b, 0x26,
65	0x6c, 0x36,
66	0x6d, 0xf0,
67	0x6e, 0x41,
68	0x6f, 0x13,
69	0xad, 0x70,
70	0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
71};
72
73static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
74{
75	struct i2c_client *client = v4l2_get_subdevdata(sd);
76
77	return i2c_smbus_write_byte_data(client, reg, value);
78}
79
80static int write_regs(struct v4l2_subdev *sd, const u8 *regs)
81{
82	int i;
83
84	for (i = 0; regs[i] != 0x00; i += 2)
85		if (write_reg(sd, regs[i], regs[i + 1]) < 0)
86			return -1;
87	return 0;
88}
89
90static int tw9906_s_video_routing(struct v4l2_subdev *sd, u32 input,
91				      u32 output, u32 config)
92{
93	write_reg(sd, 0x02, 0x40 | (input << 1));
94	return 0;
95}
96
97static int tw9906_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
98{
99	struct tw9906 *dec = to_state(sd);
100	bool is_60hz = norm & V4L2_STD_525_60;
101	static const u8 config_60hz[] = {
102		0x05, 0x81,
103		0x07, 0x02,
104		0x08, 0x14,
105		0x09, 0xf0,
106		0,    0,
107	};
108	static const u8 config_50hz[] = {
109		0x05, 0x01,
110		0x07, 0x12,
111		0x08, 0x18,
112		0x09, 0x20,
113		0,    0,
114	};
115
116	write_regs(sd, is_60hz ? config_60hz : config_50hz);
117	dec->norm = norm;
118	return 0;
119}
120
121static int tw9906_s_ctrl(struct v4l2_ctrl *ctrl)
122{
123	struct tw9906 *dec = container_of(ctrl->handler, struct tw9906, hdl);
124	struct v4l2_subdev *sd = &dec->sd;
125
126	switch (ctrl->id) {
127	case V4L2_CID_BRIGHTNESS:
128		write_reg(sd, 0x10, ctrl->val);
129		break;
130	case V4L2_CID_CONTRAST:
131		write_reg(sd, 0x11, ctrl->val);
132		break;
133	case V4L2_CID_HUE:
134		write_reg(sd, 0x15, ctrl->val);
135		break;
136	default:
137		return -EINVAL;
138	}
139	return 0;
140}
141
142static int tw9906_log_status(struct v4l2_subdev *sd)
143{
144	struct tw9906 *dec = to_state(sd);
145	bool is_60hz = dec->norm & V4L2_STD_525_60;
146
147	v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
148	v4l2_ctrl_subdev_log_status(sd);
149	return 0;
150}
151
152/* --------------------------------------------------------------------------*/
153
154static const struct v4l2_ctrl_ops tw9906_ctrl_ops = {
155	.s_ctrl = tw9906_s_ctrl,
156};
157
158static const struct v4l2_subdev_core_ops tw9906_core_ops = {
159	.log_status = tw9906_log_status,
160};
161
162static const struct v4l2_subdev_video_ops tw9906_video_ops = {
163	.s_std = tw9906_s_std,
164	.s_routing = tw9906_s_video_routing,
165};
166
167static const struct v4l2_subdev_ops tw9906_ops = {
168	.core = &tw9906_core_ops,
169	.video = &tw9906_video_ops,
170};
171
172static int tw9906_probe(struct i2c_client *client,
173			     const struct i2c_device_id *id)
174{
175	struct tw9906 *dec;
176	struct v4l2_subdev *sd;
177	struct v4l2_ctrl_handler *hdl;
178
179	/* Check if the adapter supports the needed features */
180	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
181		return -EIO;
182
183	v4l_info(client, "chip found @ 0x%02x (%s)\n",
184			client->addr << 1, client->adapter->name);
185
186	dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
187	if (dec == NULL)
188		return -ENOMEM;
189	sd = &dec->sd;
190	v4l2_i2c_subdev_init(sd, client, &tw9906_ops);
191	hdl = &dec->hdl;
192	v4l2_ctrl_handler_init(hdl, 4);
193	v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
194		V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
195	v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
196		V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
197	v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
198		V4L2_CID_HUE, -128, 127, 1, 0);
199	sd->ctrl_handler = hdl;
200	if (hdl->error) {
201		int err = hdl->error;
202
203		v4l2_ctrl_handler_free(hdl);
204		return err;
205	}
206
207	/* Initialize tw9906 */
208	dec->norm = V4L2_STD_NTSC;
209
210	if (write_regs(sd, initial_registers) < 0) {
211		v4l2_err(client, "error initializing TW9906\n");
212		return -EINVAL;
213	}
214
215	return 0;
216}
217
218static int tw9906_remove(struct i2c_client *client)
219{
220	struct v4l2_subdev *sd = i2c_get_clientdata(client);
221
222	v4l2_device_unregister_subdev(sd);
223	v4l2_ctrl_handler_free(&to_state(sd)->hdl);
224	return 0;
225}
226
227/* ----------------------------------------------------------------------- */
228
229static const struct i2c_device_id tw9906_id[] = {
230	{ "tw9906", 0 },
231	{ }
232};
233MODULE_DEVICE_TABLE(i2c, tw9906_id);
234
235static struct i2c_driver tw9906_driver = {
236	.driver = {
237		.name	= "tw9906",
238	},
239	.probe = tw9906_probe,
240	.remove = tw9906_remove,
241	.id_table = tw9906_id,
242};
243module_i2c_driver(tw9906_driver);
244