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40199c50 C |
1 | /* |
2 | * ths7303- THS7303 Video Amplifier driver | |
3 | * | |
4 | * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/ | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation version 2. | |
9 | * | |
10 | * This program is distributed .as is. WITHOUT ANY WARRANTY of any | |
11 | * kind, whether express or implied; without even the implied warranty | |
12 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/ctype.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
40199c50 C |
20 | #include <linux/i2c.h> |
21 | #include <linux/device.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/uaccess.h> | |
25 | #include <linux/videodev2.h> | |
26 | ||
27 | #include <media/v4l2-device.h> | |
28 | #include <media/v4l2-subdev.h> | |
29 | #include <media/v4l2-chip-ident.h> | |
30 | ||
31 | MODULE_DESCRIPTION("TI THS7303 video amplifier driver"); | |
32 | MODULE_AUTHOR("Chaithrika U S"); | |
33 | MODULE_LICENSE("GPL"); | |
34 | ||
35 | static int debug; | |
36 | module_param(debug, int, 0644); | |
37 | MODULE_PARM_DESC(debug, "Debug level 0-1"); | |
38 | ||
39 | /* following function is used to set ths7303 */ | |
40 | static int ths7303_setvalue(struct v4l2_subdev *sd, v4l2_std_id std) | |
41 | { | |
42 | int err = 0; | |
43 | u8 val; | |
44 | struct i2c_client *client; | |
45 | ||
46 | client = v4l2_get_subdevdata(sd); | |
47 | ||
48 | if (std & (V4L2_STD_ALL & ~V4L2_STD_SECAM)) { | |
49 | val = 0x02; | |
50 | v4l2_dbg(1, debug, sd, "setting value for SDTV format\n"); | |
51 | } else { | |
52 | val = 0x00; | |
53 | v4l2_dbg(1, debug, sd, "disabling all channels\n"); | |
54 | } | |
55 | ||
56 | err |= i2c_smbus_write_byte_data(client, 0x01, val); | |
57 | err |= i2c_smbus_write_byte_data(client, 0x02, val); | |
58 | err |= i2c_smbus_write_byte_data(client, 0x03, val); | |
59 | ||
60 | if (err) | |
61 | v4l2_err(sd, "write failed\n"); | |
62 | ||
63 | return err; | |
64 | } | |
65 | ||
66 | static int ths7303_s_std_output(struct v4l2_subdev *sd, v4l2_std_id norm) | |
67 | { | |
68 | return ths7303_setvalue(sd, norm); | |
69 | } | |
70 | ||
71 | static int ths7303_g_chip_ident(struct v4l2_subdev *sd, | |
72 | struct v4l2_dbg_chip_ident *chip) | |
73 | { | |
74 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
75 | ||
76 | return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_THS7303, 0); | |
77 | } | |
78 | ||
79 | static const struct v4l2_subdev_video_ops ths7303_video_ops = { | |
80 | .s_std_output = ths7303_s_std_output, | |
81 | }; | |
82 | ||
83 | static const struct v4l2_subdev_core_ops ths7303_core_ops = { | |
84 | .g_chip_ident = ths7303_g_chip_ident, | |
85 | }; | |
86 | ||
87 | static const struct v4l2_subdev_ops ths7303_ops = { | |
88 | .core = &ths7303_core_ops, | |
89 | .video = &ths7303_video_ops, | |
90 | }; | |
91 | ||
92 | static int ths7303_probe(struct i2c_client *client, | |
93 | const struct i2c_device_id *id) | |
94 | { | |
95 | struct v4l2_subdev *sd; | |
96 | v4l2_std_id std_id = V4L2_STD_NTSC; | |
97 | ||
98 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
99 | return -ENODEV; | |
100 | ||
101 | v4l_info(client, "chip found @ 0x%x (%s)\n", | |
102 | client->addr << 1, client->adapter->name); | |
103 | ||
104 | sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); | |
105 | if (sd == NULL) | |
106 | return -ENOMEM; | |
107 | ||
108 | v4l2_i2c_subdev_init(sd, client, &ths7303_ops); | |
109 | ||
110 | return ths7303_setvalue(sd, std_id); | |
111 | } | |
112 | ||
113 | static int ths7303_remove(struct i2c_client *client) | |
114 | { | |
115 | struct v4l2_subdev *sd = i2c_get_clientdata(client); | |
116 | ||
117 | v4l2_device_unregister_subdev(sd); | |
118 | kfree(sd); | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | static const struct i2c_device_id ths7303_id[] = { | |
124 | {"ths7303", 0}, | |
125 | {}, | |
126 | }; | |
127 | ||
128 | MODULE_DEVICE_TABLE(i2c, ths7303_id); | |
129 | ||
130 | static struct i2c_driver ths7303_driver = { | |
131 | .driver = { | |
132 | .owner = THIS_MODULE, | |
133 | .name = "ths7303", | |
134 | }, | |
135 | .probe = ths7303_probe, | |
136 | .remove = ths7303_remove, | |
137 | .id_table = ths7303_id, | |
138 | }; | |
139 | ||
140 | static int __init ths7303_init(void) | |
141 | { | |
142 | return i2c_add_driver(&ths7303_driver); | |
143 | } | |
144 | ||
145 | static void __exit ths7303_exit(void) | |
146 | { | |
147 | i2c_del_driver(&ths7303_driver); | |
148 | } | |
149 | ||
150 | module_init(ths7303_init); | |
151 | module_exit(ths7303_exit); | |
152 |