xref: /openbmc/linux/drivers/media/i2c/tw9906.c (revision d2999e1b)
1 /*
2  * Copyright (C) 2005-2006 Micronas USA Inc.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License (Version 2) as
6  * published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * GNU General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program; if not, write to the Free Software Foundation,
15  * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
16  */
17 
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/i2c.h>
21 #include <linux/videodev2.h>
22 #include <linux/ioctl.h>
23 #include <linux/slab.h>
24 #include <media/v4l2-device.h>
25 #include <media/v4l2-ctrls.h>
26 
27 MODULE_DESCRIPTION("TW9906 I2C subdev driver");
28 MODULE_LICENSE("GPL v2");
29 
30 struct tw9906 {
31 	struct v4l2_subdev sd;
32 	struct v4l2_ctrl_handler hdl;
33 	v4l2_std_id norm;
34 };
35 
36 static inline struct tw9906 *to_state(struct v4l2_subdev *sd)
37 {
38 	return container_of(sd, struct tw9906, sd);
39 }
40 
41 static const u8 initial_registers[] = {
42 	0x02, 0x40, /* input 0, composite */
43 	0x03, 0xa2, /* correct digital format */
44 	0x05, 0x81, /* or 0x01 for PAL */
45 	0x07, 0x02, /* window */
46 	0x08, 0x14, /* window */
47 	0x09, 0xf0, /* window */
48 	0x0a, 0x10, /* window */
49 	0x0b, 0xd0, /* window */
50 	0x0d, 0x00, /* scaling */
51 	0x0e, 0x11, /* scaling */
52 	0x0f, 0x00, /* scaling */
53 	0x10, 0x00, /* brightness */
54 	0x11, 0x60, /* contrast */
55 	0x12, 0x11, /* sharpness */
56 	0x13, 0x7e, /* U gain */
57 	0x14, 0x7e, /* V gain */
58 	0x15, 0x00, /* hue */
59 	0x19, 0x57, /* vbi */
60 	0x1a, 0x0f,
61 	0x1b, 0x40,
62 	0x29, 0x03,
63 	0x55, 0x00,
64 	0x6b, 0x26,
65 	0x6c, 0x36,
66 	0x6d, 0xf0,
67 	0x6e, 0x41,
68 	0x6f, 0x13,
69 	0xad, 0x70,
70 	0x00, 0x00, /* Terminator (reg 0x00 is read-only) */
71 };
72 
73 static int write_reg(struct v4l2_subdev *sd, u8 reg, u8 value)
74 {
75 	struct i2c_client *client = v4l2_get_subdevdata(sd);
76 
77 	return i2c_smbus_write_byte_data(client, reg, value);
78 }
79 
80 static int write_regs(struct v4l2_subdev *sd, const u8 *regs)
81 {
82 	int i;
83 
84 	for (i = 0; regs[i] != 0x00; i += 2)
85 		if (write_reg(sd, regs[i], regs[i + 1]) < 0)
86 			return -1;
87 	return 0;
88 }
89 
90 static int tw9906_s_video_routing(struct v4l2_subdev *sd, u32 input,
91 				      u32 output, u32 config)
92 {
93 	write_reg(sd, 0x02, 0x40 | (input << 1));
94 	return 0;
95 }
96 
97 static int tw9906_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
98 {
99 	struct tw9906 *dec = to_state(sd);
100 	bool is_60hz = norm & V4L2_STD_525_60;
101 	static const u8 config_60hz[] = {
102 		0x05, 0x81,
103 		0x07, 0x02,
104 		0x08, 0x14,
105 		0x09, 0xf0,
106 		0,    0,
107 	};
108 	static const u8 config_50hz[] = {
109 		0x05, 0x01,
110 		0x07, 0x12,
111 		0x08, 0x18,
112 		0x09, 0x20,
113 		0,    0,
114 	};
115 
116 	write_regs(sd, is_60hz ? config_60hz : config_50hz);
117 	dec->norm = norm;
118 	return 0;
119 }
120 
121 static int tw9906_s_ctrl(struct v4l2_ctrl *ctrl)
122 {
123 	struct tw9906 *dec = container_of(ctrl->handler, struct tw9906, hdl);
124 	struct v4l2_subdev *sd = &dec->sd;
125 
126 	switch (ctrl->id) {
127 	case V4L2_CID_BRIGHTNESS:
128 		write_reg(sd, 0x10, ctrl->val);
129 		break;
130 	case V4L2_CID_CONTRAST:
131 		write_reg(sd, 0x11, ctrl->val);
132 		break;
133 	case V4L2_CID_HUE:
134 		write_reg(sd, 0x15, ctrl->val);
135 		break;
136 	default:
137 		return -EINVAL;
138 	}
139 	return 0;
140 }
141 
142 static int tw9906_log_status(struct v4l2_subdev *sd)
143 {
144 	struct tw9906 *dec = to_state(sd);
145 	bool is_60hz = dec->norm & V4L2_STD_525_60;
146 
147 	v4l2_info(sd, "Standard: %d Hz\n", is_60hz ? 60 : 50);
148 	v4l2_ctrl_subdev_log_status(sd);
149 	return 0;
150 }
151 
152 /* --------------------------------------------------------------------------*/
153 
154 static const struct v4l2_ctrl_ops tw9906_ctrl_ops = {
155 	.s_ctrl = tw9906_s_ctrl,
156 };
157 
158 static const struct v4l2_subdev_core_ops tw9906_core_ops = {
159 	.log_status = tw9906_log_status,
160 };
161 
162 static const struct v4l2_subdev_video_ops tw9906_video_ops = {
163 	.s_std = tw9906_s_std,
164 	.s_routing = tw9906_s_video_routing,
165 };
166 
167 static const struct v4l2_subdev_ops tw9906_ops = {
168 	.core = &tw9906_core_ops,
169 	.video = &tw9906_video_ops,
170 };
171 
172 static int tw9906_probe(struct i2c_client *client,
173 			     const struct i2c_device_id *id)
174 {
175 	struct tw9906 *dec;
176 	struct v4l2_subdev *sd;
177 	struct v4l2_ctrl_handler *hdl;
178 
179 	/* Check if the adapter supports the needed features */
180 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
181 		return -EIO;
182 
183 	v4l_info(client, "chip found @ 0x%02x (%s)\n",
184 			client->addr << 1, client->adapter->name);
185 
186 	dec = devm_kzalloc(&client->dev, sizeof(*dec), GFP_KERNEL);
187 	if (dec == NULL)
188 		return -ENOMEM;
189 	sd = &dec->sd;
190 	v4l2_i2c_subdev_init(sd, client, &tw9906_ops);
191 	hdl = &dec->hdl;
192 	v4l2_ctrl_handler_init(hdl, 4);
193 	v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
194 		V4L2_CID_BRIGHTNESS, -128, 127, 1, 0);
195 	v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
196 		V4L2_CID_CONTRAST, 0, 255, 1, 0x60);
197 	v4l2_ctrl_new_std(hdl, &tw9906_ctrl_ops,
198 		V4L2_CID_HUE, -128, 127, 1, 0);
199 	sd->ctrl_handler = hdl;
200 	if (hdl->error) {
201 		int err = hdl->error;
202 
203 		v4l2_ctrl_handler_free(hdl);
204 		return err;
205 	}
206 
207 	/* Initialize tw9906 */
208 	dec->norm = V4L2_STD_NTSC;
209 
210 	if (write_regs(sd, initial_registers) < 0) {
211 		v4l2_err(client, "error initializing TW9906\n");
212 		return -EINVAL;
213 	}
214 
215 	return 0;
216 }
217 
218 static int tw9906_remove(struct i2c_client *client)
219 {
220 	struct v4l2_subdev *sd = i2c_get_clientdata(client);
221 
222 	v4l2_device_unregister_subdev(sd);
223 	v4l2_ctrl_handler_free(&to_state(sd)->hdl);
224 	return 0;
225 }
226 
227 /* ----------------------------------------------------------------------- */
228 
229 static const struct i2c_device_id tw9906_id[] = {
230 	{ "tw9906", 0 },
231 	{ }
232 };
233 MODULE_DEVICE_TABLE(i2c, tw9906_id);
234 
235 static struct i2c_driver tw9906_driver = {
236 	.driver = {
237 		.owner	= THIS_MODULE,
238 		.name	= "tw9906",
239 	},
240 	.probe = tw9906_probe,
241 	.remove = tw9906_remove,
242 	.id_table = tw9906_id,
243 };
244 module_i2c_driver(tw9906_driver);
245