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
27 MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
28 MODULE_AUTHOR("Mike Bernson & Dave Perks");
29 MODULE_LICENSE("GPL");
30
31 static int debug;
32 module_param(debug, int, 0);
33 MODULE_PARM_DESC(debug, "Debug level (0-1)");
34
35
36 /* ----------------------------------------------------------------------- */
37
38 #define BT856_REG_OFFSET 0xDA
39 #define BT856_NR_REG 6
40
41 struct bt856 {
42 struct v4l2_subdev sd;
43 unsigned char reg[BT856_NR_REG];
44
45 v4l2_std_id norm;
46 };
47
to_bt856(struct v4l2_subdev * sd)48 static inline struct bt856 *to_bt856(struct v4l2_subdev *sd)
49 {
50 return container_of(sd, struct bt856, sd);
51 }
52
53 /* ----------------------------------------------------------------------- */
54
bt856_write(struct bt856 * encoder,u8 reg,u8 value)55 static 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
bt856_setbit(struct bt856 * encoder,u8 reg,u8 bit,u8 value)63 static 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
bt856_dump(struct bt856 * encoder)70 static 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
bt856_init(struct v4l2_subdev * sd,u32 arg)82 static 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
bt856_s_std_output(struct v4l2_subdev * sd,v4l2_std_id std)109 static 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
bt856_s_routing(struct v4l2_subdev * sd,u32 input,u32 output,u32 config)130 static 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
168 static const struct v4l2_subdev_core_ops bt856_core_ops = {
169 .init = bt856_init,
170 };
171
172 static 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
177 static const struct v4l2_subdev_ops bt856_ops = {
178 .core = &bt856_core_ops,
179 .video = &bt856_video_ops,
180 };
181
182 /* ----------------------------------------------------------------------- */
183
bt856_probe(struct i2c_client * client)184 static 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
bt856_remove(struct i2c_client * client)225 static 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
232 static const struct i2c_device_id bt856_id[] = {
233 { "bt856", 0 },
234 { }
235 };
236 MODULE_DEVICE_TABLE(i2c, bt856_id);
237
238 static 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
247 module_i2c_driver(bt856_driver);
248
