1/*
2 * bt856 - BT856A Digital Video Encoder (Rockwell Part)
3 *
4 * Copyright (C) 1999 Mike Bernson <mike@mlb.org>
5 * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
6 *
7 * Modifications for LML33/DC10plus unified driver
8 * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
9 *
10 * This code was modify/ported from the saa7111 driver written
11 * by Dave Perks.
12 *
13 * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
14 *   - moved over to linux>=2.4.x i2c protocol (9/9/2002)
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 */
30
31#include <linux/module.h>
32#include <linux/types.h>
33#include <linux/slab.h>
34#include <linux/ioctl.h>
35#include <asm/uaccess.h>
36#include <linux/i2c.h>
37#include <linux/videodev2.h>
38#include <media/v4l2-device.h>
39
40MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
41MODULE_AUTHOR("Mike Bernson & Dave Perks");
42MODULE_LICENSE("GPL");
43
44static int debug;
45module_param(debug, int, 0);
46MODULE_PARM_DESC(debug, "Debug level (0-1)");
47
48
49/* ----------------------------------------------------------------------- */
50
51#define BT856_REG_OFFSET	0xDA
52#define BT856_NR_REG		6
53
54struct bt856 {
55	struct v4l2_subdev sd;
56	unsigned char reg[BT856_NR_REG];
57
58	v4l2_std_id norm;
59};
60
61static inline struct bt856 *to_bt856(struct v4l2_subdev *sd)
62{
63	return container_of(sd, struct bt856, sd);
64}
65
66/* ----------------------------------------------------------------------- */
67
68static inline int bt856_write(struct bt856 *encoder, u8 reg, u8 value)
69{
70	struct i2c_client *client = v4l2_get_subdevdata(&encoder->sd);
71
72	encoder->reg[reg - BT856_REG_OFFSET] = value;
73	return i2c_smbus_write_byte_data(client, reg, value);
74}
75
76static inline int bt856_setbit(struct bt856 *encoder, u8 reg, u8 bit, u8 value)
77{
78	return bt856_write(encoder, reg,
79		(encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
80				(value ? (1 << bit) : 0));
81}
82
83static void bt856_dump(struct bt856 *encoder)
84{
85	int i;
86
87	v4l2_info(&encoder->sd, "register dump:\n");
88	for (i = 0; i < BT856_NR_REG; i += 2)
89		printk(KERN_CONT " %02x", encoder->reg[i]);
90	printk(KERN_CONT "\n");
91}
92
93/* ----------------------------------------------------------------------- */
94
95static int bt856_init(struct v4l2_subdev *sd, u32 arg)
96{
97	struct bt856 *encoder = to_bt856(sd);
98
99	/* This is just for testing!!! */
100	v4l2_dbg(1, debug, sd, "init\n");
101	bt856_write(encoder, 0xdc, 0x18);
102	bt856_write(encoder, 0xda, 0);
103	bt856_write(encoder, 0xde, 0);
104
105	bt856_setbit(encoder, 0xdc, 3, 1);
106	/*bt856_setbit(encoder, 0xdc, 6, 0);*/
107	bt856_setbit(encoder, 0xdc, 4, 1);
108
109	if (encoder->norm & V4L2_STD_NTSC)
110		bt856_setbit(encoder, 0xdc, 2, 0);
111	else
112		bt856_setbit(encoder, 0xdc, 2, 1);
113
114	bt856_setbit(encoder, 0xdc, 1, 1);
115	bt856_setbit(encoder, 0xde, 4, 0);
116	bt856_setbit(encoder, 0xde, 3, 1);
117	if (debug != 0)
118		bt856_dump(encoder);
119	return 0;
120}
121
122static int bt856_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
123{
124	struct bt856 *encoder = to_bt856(sd);
125
126	v4l2_dbg(1, debug, sd, "set norm %llx\n", (unsigned long long)std);
127
128	if (std & V4L2_STD_NTSC) {
129		bt856_setbit(encoder, 0xdc, 2, 0);
130	} else if (std & V4L2_STD_PAL) {
131		bt856_setbit(encoder, 0xdc, 2, 1);
132		bt856_setbit(encoder, 0xda, 0, 0);
133		/*bt856_setbit(encoder, 0xda, 0, 1);*/
134	} else {
135		return -EINVAL;
136	}
137	encoder->norm = std;
138	if (debug != 0)
139		bt856_dump(encoder);
140	return 0;
141}
142
143static int bt856_s_routing(struct v4l2_subdev *sd,
144			   u32 input, u32 output, u32 config)
145{
146	struct bt856 *encoder = to_bt856(sd);
147
148	v4l2_dbg(1, debug, sd, "set input %d\n", input);
149
150	/* We only have video bus.
151	 * input= 0: input is from bt819
152	 * input= 1: input is from ZR36060 */
153	switch (input) {
154	case 0:
155		bt856_setbit(encoder, 0xde, 4, 0);
156		bt856_setbit(encoder, 0xde, 3, 1);
157		bt856_setbit(encoder, 0xdc, 3, 1);
158		bt856_setbit(encoder, 0xdc, 6, 0);
159		break;
160	case 1:
161		bt856_setbit(encoder, 0xde, 4, 0);
162		bt856_setbit(encoder, 0xde, 3, 1);
163		bt856_setbit(encoder, 0xdc, 3, 1);
164		bt856_setbit(encoder, 0xdc, 6, 1);
165		break;
166	case 2:	/* Color bar */
167		bt856_setbit(encoder, 0xdc, 3, 0);
168		bt856_setbit(encoder, 0xde, 4, 1);
169		break;
170	default:
171		return -EINVAL;
172	}
173
174	if (debug != 0)
175		bt856_dump(encoder);
176	return 0;
177}
178
179/* ----------------------------------------------------------------------- */
180
181static const struct v4l2_subdev_core_ops bt856_core_ops = {
182	.init = bt856_init,
183};
184
185static const struct v4l2_subdev_video_ops bt856_video_ops = {
186	.s_std_output = bt856_s_std_output,
187	.s_routing = bt856_s_routing,
188};
189
190static const struct v4l2_subdev_ops bt856_ops = {
191	.core = &bt856_core_ops,
192	.video = &bt856_video_ops,
193};
194
195/* ----------------------------------------------------------------------- */
196
197static int bt856_probe(struct i2c_client *client,
198			const struct i2c_device_id *id)
199{
200	struct bt856 *encoder;
201	struct v4l2_subdev *sd;
202
203	/* Check if the adapter supports the needed features */
204	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
205		return -ENODEV;
206
207	v4l_info(client, "chip found @ 0x%x (%s)\n",
208			client->addr << 1, client->adapter->name);
209
210	encoder = devm_kzalloc(&client->dev, sizeof(*encoder), GFP_KERNEL);
211	if (encoder == NULL)
212		return -ENOMEM;
213	sd = &encoder->sd;
214	v4l2_i2c_subdev_init(sd, client, &bt856_ops);
215	encoder->norm = V4L2_STD_NTSC;
216
217	bt856_write(encoder, 0xdc, 0x18);
218	bt856_write(encoder, 0xda, 0);
219	bt856_write(encoder, 0xde, 0);
220
221	bt856_setbit(encoder, 0xdc, 3, 1);
222	/*bt856_setbit(encoder, 0xdc, 6, 0);*/
223	bt856_setbit(encoder, 0xdc, 4, 1);
224
225	if (encoder->norm & V4L2_STD_NTSC)
226		bt856_setbit(encoder, 0xdc, 2, 0);
227	else
228		bt856_setbit(encoder, 0xdc, 2, 1);
229
230	bt856_setbit(encoder, 0xdc, 1, 1);
231	bt856_setbit(encoder, 0xde, 4, 0);
232	bt856_setbit(encoder, 0xde, 3, 1);
233
234	if (debug != 0)
235		bt856_dump(encoder);
236	return 0;
237}
238
239static int bt856_remove(struct i2c_client *client)
240{
241	struct v4l2_subdev *sd = i2c_get_clientdata(client);
242
243	v4l2_device_unregister_subdev(sd);
244	return 0;
245}
246
247static const struct i2c_device_id bt856_id[] = {
248	{ "bt856", 0 },
249	{ }
250};
251MODULE_DEVICE_TABLE(i2c, bt856_id);
252
253static struct i2c_driver bt856_driver = {
254	.driver = {
255		.owner	= THIS_MODULE,
256		.name	= "bt856",
257	},
258	.probe		= bt856_probe,
259	.remove		= bt856_remove,
260	.id_table	= bt856_id,
261};
262
263module_i2c_driver(bt856_driver);
264