1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * bt856 - BT856A Digital Video Encoder (Rockwell Part)
4 *
5 * Copyright (C) 1999 Mike Bernson <mike@mlb.org>
6 * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
7 *
8 * Modifications for LML33/DC10plus unified driver
9 * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
10 *
11 * This code was modify/ported from the saa7111 driver written
12 * by Dave Perks.
13 *
14 * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
15 *   - moved over to linux>=2.4.x i2c protocol (9/9/2002)
16 */
17
18#include <linux/module.h>
19#include <linux/types.h>
20#include <linux/slab.h>
21#include <linux/ioctl.h>
22#include <linux/uaccess.h>
23#include <linux/i2c.h>
24#include <linux/videodev2.h>
25#include <media/v4l2-device.h>
26
27MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
28MODULE_AUTHOR("Mike Bernson & Dave Perks");
29MODULE_LICENSE("GPL");
30
31static int debug;
32module_param(debug, int, 0);
33MODULE_PARM_DESC(debug, "Debug level (0-1)");
34
35
36/* ----------------------------------------------------------------------- */
37
38#define BT856_REG_OFFSET	0xDA
39#define BT856_NR_REG		6
40
41struct bt856 {
42	struct v4l2_subdev sd;
43	unsigned char reg[BT856_NR_REG];
44
45	v4l2_std_id norm;
46};
47
48static inline struct bt856 *to_bt856(struct v4l2_subdev *sd)
49{
50	return container_of(sd, struct bt856, sd);
51}
52
53/* ----------------------------------------------------------------------- */
54
55static inline int bt856_write(struct bt856 *encoder, u8 reg, u8 value)
56{
57	struct i2c_client *client = v4l2_get_subdevdata(&encoder->sd);
58
59	encoder->reg[reg - BT856_REG_OFFSET] = value;
60	return i2c_smbus_write_byte_data(client, reg, value);
61}
62
63static inline int bt856_setbit(struct bt856 *encoder, u8 reg, u8 bit, u8 value)
64{
65	return bt856_write(encoder, reg,
66		(encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
67				(value ? (1 << bit) : 0));
68}
69
70static void bt856_dump(struct bt856 *encoder)
71{
72	int i;
73
74	v4l2_info(&encoder->sd, "register dump:\n");
75	for (i = 0; i < BT856_NR_REG; i += 2)
76		printk(KERN_CONT " %02x", encoder->reg[i]);
77	printk(KERN_CONT "\n");
78}
79
80/* ----------------------------------------------------------------------- */
81
82static int bt856_init(struct v4l2_subdev *sd, u32 arg)
83{
84	struct bt856 *encoder = to_bt856(sd);
85
86	/* This is just for testing!!! */
87	v4l2_dbg(1, debug, sd, "init\n");
88	bt856_write(encoder, 0xdc, 0x18);
89	bt856_write(encoder, 0xda, 0);
90	bt856_write(encoder, 0xde, 0);
91
92	bt856_setbit(encoder, 0xdc, 3, 1);
93	/*bt856_setbit(encoder, 0xdc, 6, 0);*/
94	bt856_setbit(encoder, 0xdc, 4, 1);
95
96	if (encoder->norm & V4L2_STD_NTSC)
97		bt856_setbit(encoder, 0xdc, 2, 0);
98	else
99		bt856_setbit(encoder, 0xdc, 2, 1);
100
101	bt856_setbit(encoder, 0xdc, 1, 1);
102	bt856_setbit(encoder, 0xde, 4, 0);
103	bt856_setbit(encoder, 0xde, 3, 1);
104	if (debug != 0)
105		bt856_dump(encoder);
106	return 0;
107}
108
109static int bt856_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
110{
111	struct bt856 *encoder = to_bt856(sd);
112
113	v4l2_dbg(1, debug, sd, "set norm %llx\n", (unsigned long long)std);
114
115	if (std & V4L2_STD_NTSC) {
116		bt856_setbit(encoder, 0xdc, 2, 0);
117	} else if (std & V4L2_STD_PAL) {
118		bt856_setbit(encoder, 0xdc, 2, 1);
119		bt856_setbit(encoder, 0xda, 0, 0);
120		/*bt856_setbit(encoder, 0xda, 0, 1);*/
121	} else {
122		return -EINVAL;
123	}
124	encoder->norm = std;
125	if (debug != 0)
126		bt856_dump(encoder);
127	return 0;
128}
129
130static int bt856_s_routing(struct v4l2_subdev *sd,
131			   u32 input, u32 output, u32 config)
132{
133	struct bt856 *encoder = to_bt856(sd);
134
135	v4l2_dbg(1, debug, sd, "set input %d\n", input);
136
137	/* We only have video bus.
138	 * input= 0: input is from bt819
139	 * input= 1: input is from ZR36060 */
140	switch (input) {
141	case 0:
142		bt856_setbit(encoder, 0xde, 4, 0);
143		bt856_setbit(encoder, 0xde, 3, 1);
144		bt856_setbit(encoder, 0xdc, 3, 1);
145		bt856_setbit(encoder, 0xdc, 6, 0);
146		break;
147	case 1:
148		bt856_setbit(encoder, 0xde, 4, 0);
149		bt856_setbit(encoder, 0xde, 3, 1);
150		bt856_setbit(encoder, 0xdc, 3, 1);
151		bt856_setbit(encoder, 0xdc, 6, 1);
152		break;
153	case 2:	/* Color bar */
154		bt856_setbit(encoder, 0xdc, 3, 0);
155		bt856_setbit(encoder, 0xde, 4, 1);
156		break;
157	default:
158		return -EINVAL;
159	}
160
161	if (debug != 0)
162		bt856_dump(encoder);
163	return 0;
164}
165
166/* ----------------------------------------------------------------------- */
167
168static const struct v4l2_subdev_core_ops bt856_core_ops = {
169	.init = bt856_init,
170};
171
172static const struct v4l2_subdev_video_ops bt856_video_ops = {
173	.s_std_output = bt856_s_std_output,
174	.s_routing = bt856_s_routing,
175};
176
177static const struct v4l2_subdev_ops bt856_ops = {
178	.core = &bt856_core_ops,
179	.video = &bt856_video_ops,
180};
181
182/* ----------------------------------------------------------------------- */
183
184static int bt856_probe(struct i2c_client *client)
185{
186	struct bt856 *encoder;
187	struct v4l2_subdev *sd;
188
189	/* Check if the adapter supports the needed features */
190	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
191		return -ENODEV;
192
193	v4l_info(client, "chip found @ 0x%x (%s)\n",
194			client->addr << 1, client->adapter->name);
195
196	encoder = devm_kzalloc(&client->dev, sizeof(*encoder), GFP_KERNEL);
197	if (encoder == NULL)
198		return -ENOMEM;
199	sd = &encoder->sd;
200	v4l2_i2c_subdev_init(sd, client, &bt856_ops);
201	encoder->norm = V4L2_STD_NTSC;
202
203	bt856_write(encoder, 0xdc, 0x18);
204	bt856_write(encoder, 0xda, 0);
205	bt856_write(encoder, 0xde, 0);
206
207	bt856_setbit(encoder, 0xdc, 3, 1);
208	/*bt856_setbit(encoder, 0xdc, 6, 0);*/
209	bt856_setbit(encoder, 0xdc, 4, 1);
210
211	if (encoder->norm & V4L2_STD_NTSC)
212		bt856_setbit(encoder, 0xdc, 2, 0);
213	else
214		bt856_setbit(encoder, 0xdc, 2, 1);
215
216	bt856_setbit(encoder, 0xdc, 1, 1);
217	bt856_setbit(encoder, 0xde, 4, 0);
218	bt856_setbit(encoder, 0xde, 3, 1);
219
220	if (debug != 0)
221		bt856_dump(encoder);
222	return 0;
223}
224
225static void bt856_remove(struct i2c_client *client)
226{
227	struct v4l2_subdev *sd = i2c_get_clientdata(client);
228
229	v4l2_device_unregister_subdev(sd);
230}
231
232static const struct i2c_device_id bt856_id[] = {
233	{ "bt856", 0 },
234	{ }
235};
236MODULE_DEVICE_TABLE(i2c, bt856_id);
237
238static struct i2c_driver bt856_driver = {
239	.driver = {
240		.name	= "bt856",
241	},
242	.probe		= bt856_probe,
243	.remove		= bt856_remove,
244	.id_table	= bt856_id,
245};
246
247module_i2c_driver(bt856_driver);
248