diff options
Diffstat (limited to 'drivers/media/video/m52790.c')
-rw-r--r-- | drivers/media/video/m52790.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/drivers/media/video/m52790.c b/drivers/media/video/m52790.c new file mode 100644 index 000000000000..51ecbfbc1ae7 --- /dev/null +++ b/drivers/media/video/m52790.c | |||
@@ -0,0 +1,172 @@ | |||
1 | /* | ||
2 | * m52790 i2c ivtv driver. | ||
3 | * Copyright (C) 2007 Hans Verkuil | ||
4 | * | ||
5 | * A/V source switching Mitsubishi M52790SP/FP | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or modify | ||
8 | * it under the terms of the GNU General Public License as published by | ||
9 | * the Free Software Foundation; either version 2 of the License, or | ||
10 | * (at your option) any later version. | ||
11 | * | ||
12 | * This program is distributed in the hope that it will be useful, | ||
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
15 | * GNU General Public License for more details. | ||
16 | * | ||
17 | * You should have received a copy of the GNU General Public License | ||
18 | * along with this program; if not, write to the Free Software | ||
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
20 | */ | ||
21 | |||
22 | |||
23 | #include <linux/module.h> | ||
24 | #include <linux/types.h> | ||
25 | #include <linux/ioctl.h> | ||
26 | #include <asm/uaccess.h> | ||
27 | #include <linux/i2c.h> | ||
28 | #include <linux/i2c-id.h> | ||
29 | #include <linux/videodev.h> | ||
30 | #include <media/m52790.h> | ||
31 | #include <media/v4l2-common.h> | ||
32 | #include <media/v4l2-chip-ident.h> | ||
33 | #include <media/v4l2-i2c-drv-legacy.h> | ||
34 | |||
35 | MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch"); | ||
36 | MODULE_AUTHOR("Hans Verkuil"); | ||
37 | MODULE_LICENSE("GPL"); | ||
38 | |||
39 | static unsigned short normal_i2c[] = { 0x90 >> 1, I2C_CLIENT_END }; | ||
40 | |||
41 | |||
42 | I2C_CLIENT_INSMOD; | ||
43 | |||
44 | struct m52790_state { | ||
45 | u16 input; | ||
46 | u16 output; | ||
47 | }; | ||
48 | |||
49 | /* ----------------------------------------------------------------------- */ | ||
50 | |||
51 | static int m52790_write(struct i2c_client *client) | ||
52 | { | ||
53 | struct m52790_state *state = i2c_get_clientdata(client); | ||
54 | u8 sw1 = (state->input | state->output) & 0xff; | ||
55 | u8 sw2 = (state->input | state->output) >> 8; | ||
56 | |||
57 | return i2c_smbus_write_byte_data(client, sw1, sw2); | ||
58 | } | ||
59 | |||
60 | static int m52790_command(struct i2c_client *client, unsigned int cmd, | ||
61 | void *arg) | ||
62 | { | ||
63 | struct m52790_state *state = i2c_get_clientdata(client); | ||
64 | struct v4l2_routing *route = arg; | ||
65 | |||
66 | /* Note: audio and video are linked and cannot be switched separately. | ||
67 | So audio and video routing commands are identical for this chip. | ||
68 | In theory the video amplifier and audio modes could be handled | ||
69 | separately for the output, but that seems to be overkill right now. | ||
70 | The same holds for implementing an audio mute control, this is now | ||
71 | part of the audio output routing. The normal case is that another | ||
72 | chip takes care of the actual muting so making it part of the | ||
73 | output routing seems to be the right thing to do for now. */ | ||
74 | switch (cmd) { | ||
75 | case VIDIOC_INT_G_AUDIO_ROUTING: | ||
76 | case VIDIOC_INT_G_VIDEO_ROUTING: | ||
77 | route->input = state->input; | ||
78 | route->output = state->output; | ||
79 | break; | ||
80 | |||
81 | case VIDIOC_INT_S_AUDIO_ROUTING: | ||
82 | case VIDIOC_INT_S_VIDEO_ROUTING: | ||
83 | state->input = route->input; | ||
84 | state->output = route->output; | ||
85 | m52790_write(client); | ||
86 | break; | ||
87 | |||
88 | #ifdef CONFIG_VIDEO_ADV_DEBUG | ||
89 | case VIDIOC_DBG_G_REGISTER: | ||
90 | case VIDIOC_DBG_S_REGISTER: | ||
91 | { | ||
92 | struct v4l2_register *reg = arg; | ||
93 | |||
94 | if (!v4l2_chip_match_i2c_client(client, | ||
95 | reg->match_type, reg->match_chip)) | ||
96 | return -EINVAL; | ||
97 | if (!capable(CAP_SYS_ADMIN)) | ||
98 | return -EPERM; | ||
99 | if (reg->reg != 0) | ||
100 | return -EINVAL; | ||
101 | if (cmd == VIDIOC_DBG_G_REGISTER) | ||
102 | reg->val = state->input | state->output; | ||
103 | else { | ||
104 | state->input = reg->val & 0x0303; | ||
105 | state->output = reg->val & ~0x0303; | ||
106 | m52790_write(client); | ||
107 | } | ||
108 | break; | ||
109 | } | ||
110 | #endif | ||
111 | |||
112 | case VIDIOC_G_CHIP_IDENT: | ||
113 | return v4l2_chip_ident_i2c_client(client, arg, | ||
114 | V4L2_IDENT_M52790, 0); | ||
115 | |||
116 | case VIDIOC_LOG_STATUS: | ||
117 | v4l_info(client, "Switch 1: %02x\n", | ||
118 | (state->input | state->output) & 0xff); | ||
119 | v4l_info(client, "Switch 2: %02x\n", | ||
120 | (state->input | state->output) >> 8); | ||
121 | break; | ||
122 | |||
123 | default: | ||
124 | return -EINVAL; | ||
125 | } | ||
126 | return 0; | ||
127 | } | ||
128 | |||
129 | /* ----------------------------------------------------------------------- */ | ||
130 | |||
131 | /* i2c implementation */ | ||
132 | |||
133 | static int m52790_probe(struct i2c_client *client) | ||
134 | { | ||
135 | struct m52790_state *state; | ||
136 | |||
137 | /* Check if the adapter supports the needed features */ | ||
138 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | ||
139 | return -EIO; | ||
140 | |||
141 | snprintf(client->name, sizeof(client->name) - 1, "m52790"); | ||
142 | |||
143 | v4l_info(client, "chip found @ 0x%x (%s)\n", | ||
144 | client->addr << 1, client->adapter->name); | ||
145 | |||
146 | state = kmalloc(sizeof(struct m52790_state), GFP_KERNEL); | ||
147 | if (state == NULL) | ||
148 | return -ENOMEM; | ||
149 | |||
150 | state->input = M52790_IN_TUNER; | ||
151 | state->output = M52790_OUT_STEREO; | ||
152 | i2c_set_clientdata(client, state); | ||
153 | m52790_write(client); | ||
154 | return 0; | ||
155 | } | ||
156 | |||
157 | static int m52790_remove(struct i2c_client *client) | ||
158 | { | ||
159 | kfree(i2c_get_clientdata(client)); | ||
160 | return 0; | ||
161 | } | ||
162 | |||
163 | /* ----------------------------------------------------------------------- */ | ||
164 | |||
165 | static struct v4l2_i2c_driver_data v4l2_i2c_data = { | ||
166 | .name = "m52790", | ||
167 | .driverid = I2C_DRIVERID_M52790, | ||
168 | .command = m52790_command, | ||
169 | .probe = m52790_probe, | ||
170 | .remove = m52790_remove, | ||
171 | }; | ||
172 | |||