This source file includes following definitions.
- to_bt856
- bt856_write
- bt856_setbit
- bt856_dump
- bt856_init
- bt856_s_std_output
- bt856_s_routing
- bt856_probe
- bt856_remove
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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
48 static inline struct bt856 *to_bt856(struct v4l2_subdev *sd)
49 {
50 return container_of(sd, struct bt856, sd);
51 }
52
53
54
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
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
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
82 static int bt856_init(struct v4l2_subdev *sd, u32 arg)
83 {
84 struct bt856 *encoder = to_bt856(sd);
85
86
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
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
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
121 } else {
122 return -EINVAL;
123 }
124 encoder->norm = std;
125 if (debug != 0)
126 bt856_dump(encoder);
127 return 0;
128 }
129
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
138
139
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:
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
184 static int bt856_probe(struct i2c_client *client,
185 const struct i2c_device_id *id)
186 {
187 struct bt856 *encoder;
188 struct v4l2_subdev *sd;
189
190
191 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
192 return -ENODEV;
193
194 v4l_info(client, "chip found @ 0x%x (%s)\n",
195 client->addr << 1, client->adapter->name);
196
197 encoder = devm_kzalloc(&client->dev, sizeof(*encoder), GFP_KERNEL);
198 if (encoder == NULL)
199 return -ENOMEM;
200 sd = &encoder->sd;
201 v4l2_i2c_subdev_init(sd, client, &bt856_ops);
202 encoder->norm = V4L2_STD_NTSC;
203
204 bt856_write(encoder, 0xdc, 0x18);
205 bt856_write(encoder, 0xda, 0);
206 bt856_write(encoder, 0xde, 0);
207
208 bt856_setbit(encoder, 0xdc, 3, 1);
209
210 bt856_setbit(encoder, 0xdc, 4, 1);
211
212 if (encoder->norm & V4L2_STD_NTSC)
213 bt856_setbit(encoder, 0xdc, 2, 0);
214 else
215 bt856_setbit(encoder, 0xdc, 2, 1);
216
217 bt856_setbit(encoder, 0xdc, 1, 1);
218 bt856_setbit(encoder, 0xde, 4, 0);
219 bt856_setbit(encoder, 0xde, 3, 1);
220
221 if (debug != 0)
222 bt856_dump(encoder);
223 return 0;
224 }
225
226 static int bt856_remove(struct i2c_client *client)
227 {
228 struct v4l2_subdev *sd = i2c_get_clientdata(client);
229
230 v4l2_device_unregister_subdev(sd);
231 return 0;
232 }
233
234 static const struct i2c_device_id bt856_id[] = {
235 { "bt856", 0 },
236 { }
237 };
238 MODULE_DEVICE_TABLE(i2c, bt856_id);
239
240 static struct i2c_driver bt856_driver = {
241 .driver = {
242 .name = "bt856",
243 },
244 .probe = bt856_probe,
245 .remove = bt856_remove,
246 .id_table = bt856_id,
247 };
248
249 module_i2c_driver(bt856_driver);