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 <media/v4l2-device.h>
24#include <media/v4l2-ctrls.h>
25#include <linux/slab.h>
26
27MODULE_DESCRIPTION("TW9903 I2C subdev driver");
28MODULE_LICENSE("GPL v2");
29
30/*
31 * This driver is based on the wis-tw9903.c source that was in
32 * drivers/staging/media/go7007. That source had commented out code for
33 * saturation and scaling (neither seemed to work). If anyone ever gets
34 * hardware to test this driver, then that code might be useful to look at.
35 * You need to get the kernel sources of, say, kernel 3.8 where that
36 * wis-tw9903 driver is still present.
37 */
38
39struct tw9903 {
40	struct v4l2_subdev sd;
41	struct v4l2_ctrl_handler hdl;
42	v4l2_std_id norm;
43};
44
45static inline struct tw9903 *to_state(struct v4l2_subdev *sd)
46{
47	return container_of(sd, struct tw9903, sd);
48}
49
50static const u8 initial_registers[] = {
51	0x02, 0x44, /* input 1, composite */
52	0x03, 0x92, /* correct digital format */
53	0x04, 0x00,
54	0x05, 0x80, /* or 0x00 for PAL */
55	0x06, 0x40, /* second internal current reference */
56	0x07, 0x02, /* window */
57	0x08, 0x14, /* window */
58	0x09, 0xf0, /* window */
59	0x0a, 0x81, /* window */
60	0x0b, 0xd0, /* window */
61	0x0c, 0x8c,
62	0x0d, 0x00, /* scaling */
63	0x0e, 0x11, /* scaling */
64	0x0f, 0x00, /* scaling */
65	0x10, 0x00, /* brightness */
66	0x11, 0x60, /* contrast */
67	0x12, 0x01, /* sharpness */
68	0x13, 0x7f, /* U gain */
69	0x14, 0x5a, /* V gain */
70	0x15, 0x00, /* hue */
71	0x16, 0xc3, /* sharpness */
72	0x18, 0x00,
73	0x19, 0x58, /* vbi */
74	0x1a, 0x80,
75	0x1c, 0x0f, /* video norm */
76	0x1d, 0x7f, /* video norm */
77	0x20, 0xa0, /* clamping gain (working 0x50) */
78	0x21, 0x22,
79	0x22, 0xf0,
80	0x23, 0xfe,
81	0x24, 0x3c,
82	0x25, 0x38,
83	0x26, 0x44,
84	0x27, 0x20,
85	0x28, 0x00,
86	0x29, 0x15,
87	0x2a, 0xa0,
88	0x2b, 0x44,
89	0x2c, 0x37,
90	0x2d, 0x00,
91	0x2e, 0xa5, /* burst PLL control (working: a9) */
92	0x2f, 0xe0, /* 0xea is blue test frame -- 0xe0 for normal */
93	0x31, 0x00,
94	0x33, 0x22,
95	0x34, 0x11,
96	0x35, 0x35,
97	0x3b, 0x05,
98	0x06, 0xc0, /* reset device */
99	0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
100};
101
102static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
103{
104	struct i2c_client *client = v4l2_get_subdevdata(sd);
105
106	return i2c_smbus_write_byte_data(client, reg, value);
107}
108
109static int write_regs(struct v4l2_subdev *sd, const u8 *regs)
110{
111	int i;
112
113	for (i = 0; regs[i] != 0x00; i += 2)
114		if (write_reg(sd, regs[i], regs[i + 1]) < 0)
115			return -1;
116	return 0;
117}
118
119static int tw9903_s_video_routing(struct v4l2_subdev *sd, u32 input,
120				      u32 output, u32 config)
121{
122	write_reg(sd, 0x02, 0x40 | (input << 1));
123	return 0;
124}
125
126static int tw9903_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
127{
128	struct tw9903 *dec = to_state(sd);
129	bool is_60hz = norm & V4L2_STD_525_60;
130	static const u8 config_60hz[] = {
131		0x05, 0x80,
132		0x07, 0x02,
133		0x08, 0x14,
134		0x09, 0xf0,
135		0,    0,
136	};
137	static const u8 config_50hz[] = {
138		0x05, 0x00,
139		0x07, 0x12,
140		0x08, 0x18,
141		0x09, 0x20,
142		0,    0,
143	};
144
145	write_regs(sd, is_60hz ? config_60hz : config_50hz);
146	dec->norm = norm;
147	return 0;
148}
149
150
151static int tw9903_s_ctrl(struct v4l2_ctrl *ctrl)
152{
153	struct tw9903 *dec = container_of(ctrl->handler, struct tw9903, hdl);
154	struct v4l2_subdev *sd = &dec->sd;
155
156	switch (ctrl->id) {
157	case V4L2_CID_BRIGHTNESS:
158		write_reg(sd, 0x10, ctrl->val);
159		break;
160	case V4L2_CID_CONTRAST:
161		write_reg(sd, 0x11, ctrl->val);
162		break;
163	case V4L2_CID_HUE:
164		write_reg(sd, 0x15, ctrl->val);
165		break;
166	default:
167		return -EINVAL;
168	}
169	return 0;
170}
171
172static int tw9903_log_status(struct v4l2_subdev *sd)
173{
174	struct tw9903 *dec = to_state(sd);
175	bool is_60hz = dec->norm & V4L2_STD_525_60;
176
177	v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
178	v4l2_ctrl_subdev_log_status(sd);
179	return 0;
180}
181
182/* --------------------------------------------------------------------------*/
183
184static const struct v4l2_ctrl_ops tw9903_ctrl_ops = {
185	.s_ctrl = tw9903_s_ctrl,
186};
187
188static const struct v4l2_subdev_core_ops tw9903_core_ops = {
189	.log_status = tw9903_log_status,
190};
191
192static const struct v4l2_subdev_video_ops tw9903_video_ops = {
193	.s_std = tw9903_s_std,
194	.s_routing = tw9903_s_video_routing,
195};
196
197static const struct v4l2_subdev_ops tw9903_ops = {
198	.core = &tw9903_core_ops,
199	.video = &tw9903_video_ops,
200};
201
202/* --------------------------------------------------------------------------*/
203
204static int tw9903_probe(struct i2c_client *client,
205			     const struct i2c_device_id *id)
206{
207	struct tw9903 *dec;
208	struct v4l2_subdev *sd;
209	struct v4l2_ctrl_handler *hdl;
210
211	/* Check if the adapter supports the needed features */
212	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
213		return -EIO;
214
215	v4l_info(client, "chip found @ 0x%02x (%s)\n",
216			client->addr << 1, client->adapter->name);
217
218	dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
219	if (dec == NULL)
220		return -ENOMEM;
221	sd = &dec->sd;
222	v4l2_i2c_subdev_init(sd, client, &tw9903_ops);
223	hdl = &dec->hdl;
224	v4l2_ctrl_handler_init(hdl, 4);
225	v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
226		V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
227	v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
228		V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
229	v4l2_ctrl_new_std(hdl, &tw9903_ctrl_ops,
230		V4L2_CID_HUE, -128, 127, 1, 0);
231	sd->ctrl_handler = hdl;
232	if (hdl->error) {
233		int err = hdl->error;
234
235		v4l2_ctrl_handler_free(hdl);
236		return err;
237	}
238
239	/* Initialize tw9903 */
240	dec->norm = V4L2_STD_NTSC;
241
242	if (write_regs(sd, initial_registers) < 0) {
243		v4l2_err(client, "error initializing TW9903\n");
244		return -EINVAL;
245	}
246
247	return 0;
248}
249
250static int tw9903_remove(struct i2c_client *client)
251{
252	struct v4l2_subdev *sd = i2c_get_clientdata(client);
253
254	v4l2_device_unregister_subdev(sd);
255	v4l2_ctrl_handler_free(&to_state(sd)->hdl);
256	return 0;
257}
258
259/* ----------------------------------------------------------------------- */
260
261static const struct i2c_device_id tw9903_id[] = {
262	{ "tw9903", 0 },
263	{ }
264};
265MODULE_DEVICE_TABLE(i2c, tw9903_id);
266
267static struct i2c_driver tw9903_driver = {
268	.driver = {
269		.owner	= THIS_MODULE,
270		.name	= "tw9903",
271	},
272	.probe = tw9903_probe,
273	.remove = tw9903_remove,
274	.id_table = tw9903_id,
275};
276module_i2c_driver(tw9903_driver);
277