This source file includes following definitions.
- to_state
- write_reg
- write_regs
- tw9906_s_video_routing
- tw9906_s_std
- tw9906_s_ctrl
- tw9906_log_status
- tw9906_probe
- tw9906_remove
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5
6 #include <linux/module.h>
7 #include <linux/init.h>
8 #include <linux/i2c.h>
9 #include <linux/videodev2.h>
10 #include <linux/ioctl.h>
11 #include <linux/slab.h>
12 #include <media/v4l2-device.h>
13 #include <media/v4l2-ctrls.h>
14
15 MODULE_DESCRIPTION("TW9906 I2C subdev driver");
16 MODULE_LICENSE("GPL v2");
17
18 struct tw9906 {
19 struct v4l2_subdev sd;
20 struct v4l2_ctrl_handler hdl;
21 v4l2_std_id norm;
22 };
23
24 static inline struct tw9906 *to_state(struct v4l2_subdev *sd)
25 {
26 return container_of(sd, struct tw9906, sd);
27 }
28
29 static const u8 initial_registers[] = {
30 0x02, 0x40,
31 0x03, 0xa2,
32 0x05, 0x81,
33 0x07, 0x02,
34 0x08, 0x14,
35 0x09, 0xf0,
36 0x0a, 0x10,
37 0x0b, 0xd0,
38 0x0d, 0x00,
39 0x0e, 0x11,
40 0x0f, 0x00,
41 0x10, 0x00,
42 0x11, 0x60,
43 0x12, 0x11,
44 0x13, 0x7e,
45 0x14, 0x7e,
46 0x15, 0x00,
47 0x19, 0x57,
48 0x1a, 0x0f,
49 0x1b, 0x40,
50 0x29, 0x03,
51 0x55, 0x00,
52 0x6b, 0x26,
53 0x6c, 0x36,
54 0x6d, 0xf0,
55 0x6e, 0x41,
56 0x6f, 0x13,
57 0xad, 0x70,
58 0x00, 0x00,
59 };
60
61 static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
62 {
63 struct i2c_client *client = v4l2_get_subdevdata(sd);
64
65 return i2c_smbus_write_byte_data(client, reg, value);
66 }
67
68 static int write_regs(struct v4l2_subdev *sd, const u8 *regs)
69 {
70 int i;
71
72 for (i = 0; regs[i] != 0x00; i += 2)
73 if (write_reg(sd, regs[i], regs[i + 1]) < 0)
74 return -1;
75 return 0;
76 }
77
78 static int tw9906_s_video_routing(struct v4l2_subdev *sd, u32 input,
79 u32 output, u32 config)
80 {
81 write_reg(sd, 0x02, 0x40 | (input << 1));
82 return 0;
83 }
84
85 static int tw9906_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
86 {
87 struct tw9906 *dec = to_state(sd);
88 bool is_60hz = norm & V4L2_STD_525_60;
89 static const u8 config_60hz[] = {
90 0x05, 0x81,
91 0x07, 0x02,
92 0x08, 0x14,
93 0x09, 0xf0,
94 0, 0,
95 };
96 static const u8 config_50hz[] = {
97 0x05, 0x01,
98 0x07, 0x12,
99 0x08, 0x18,
100 0x09, 0x20,
101 0, 0,
102 };
103
104 write_regs(sd, is_60hz ? config_60hz : config_50hz);
105 dec->norm = norm;
106 return 0;
107 }
108
109 static int tw9906_s_ctrl(struct v4l2_ctrl *ctrl)
110 {
111 struct tw9906 *dec = container_of(ctrl->handler, struct tw9906, hdl);
112 struct v4l2_subdev *sd = &dec->sd;
113
114 switch (ctrl->id) {
115 case V4L2_CID_BRIGHTNESS:
116 write_reg(sd, 0x10, ctrl->val);
117 break;
118 case V4L2_CID_CONTRAST:
119 write_reg(sd, 0x11, ctrl->val);
120 break;
121 case V4L2_CID_HUE:
122 write_reg(sd, 0x15, ctrl->val);
123 break;
124 default:
125 return -EINVAL;
126 }
127 return 0;
128 }
129
130 static int tw9906_log_status(struct v4l2_subdev *sd)
131 {
132 struct tw9906 *dec = to_state(sd);
133 bool is_60hz = dec->norm & V4L2_STD_525_60;
134
135 v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
136 v4l2_ctrl_subdev_log_status(sd);
137 return 0;
138 }
139
140
141
142 static const struct v4l2_ctrl_ops tw9906_ctrl_ops = {
143 .s_ctrl = tw9906_s_ctrl,
144 };
145
146 static const struct v4l2_subdev_core_ops tw9906_core_ops = {
147 .log_status = tw9906_log_status,
148 };
149
150 static const struct v4l2_subdev_video_ops tw9906_video_ops = {
151 .s_std = tw9906_s_std,
152 .s_routing = tw9906_s_video_routing,
153 };
154
155 static const struct v4l2_subdev_ops tw9906_ops = {
156 .core = &tw9906_core_ops,
157 .video = &tw9906_video_ops,
158 };
159
160 static int tw9906_probe(struct i2c_client *client,
161 const struct i2c_device_id *id)
162 {
163 struct tw9906 *dec;
164 struct v4l2_subdev *sd;
165 struct v4l2_ctrl_handler *hdl;
166
167
168 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
169 return -EIO;
170
171 v4l_info(client, "chip found @ 0x%02x (%s)\n",
172 client->addr << 1, client->adapter->name);
173
174 dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
175 if (dec == NULL)
176 return -ENOMEM;
177 sd = &dec->sd;
178 v4l2_i2c_subdev_init(sd, client, &tw9906_ops);
179 hdl = &dec->hdl;
180 v4l2_ctrl_handler_init(hdl, 4);
181 v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
182 V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
183 v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
184 V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
185 v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
186 V4L2_CID_HUE, -128, 127, 1, 0);
187 sd->ctrl_handler = hdl;
188 if (hdl->error) {
189 int err = hdl->error;
190
191 v4l2_ctrl_handler_free(hdl);
192 return err;
193 }
194
195
196 dec->norm = V4L2_STD_NTSC;
197
198 if (write_regs(sd, initial_registers) < 0) {
199 v4l2_err(client, "error initializing TW9906\n");
200 return -EINVAL;
201 }
202
203 return 0;
204 }
205
206 static int tw9906_remove(struct i2c_client *client)
207 {
208 struct v4l2_subdev *sd = i2c_get_clientdata(client);
209
210 v4l2_device_unregister_subdev(sd);
211 v4l2_ctrl_handler_free(&to_state(sd)->hdl);
212 return 0;
213 }
214
215
216
217 static const struct i2c_device_id tw9906_id[] = {
218 { "tw9906", 0 },
219 { }
220 };
221 MODULE_DEVICE_TABLE(i2c, tw9906_id);
222
223 static struct i2c_driver tw9906_driver = {
224 .driver = {
225 .name = "tw9906",
226 },
227 .probe = tw9906_probe,
228 .remove = tw9906_remove,
229 .id_table = tw9906_id,
230 };
231 module_i2c_driver(tw9906_driver);