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761dacd2 HV |
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> | |
f69d419a | 33 | #include <media/v4l2-i2c-drv.h> |
761dacd2 HV |
34 | |
35 | MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch"); | |
36 | MODULE_AUTHOR("Hans Verkuil"); | |
37 | MODULE_LICENSE("GPL"); | |
38 | ||
761dacd2 HV |
39 | |
40 | struct m52790_state { | |
41 | u16 input; | |
42 | u16 output; | |
43 | }; | |
44 | ||
45 | /* ----------------------------------------------------------------------- */ | |
46 | ||
47 | static int m52790_write(struct i2c_client *client) | |
48 | { | |
49 | struct m52790_state *state = i2c_get_clientdata(client); | |
50 | u8 sw1 = (state->input | state->output) & 0xff; | |
51 | u8 sw2 = (state->input | state->output) >> 8; | |
52 | ||
53 | return i2c_smbus_write_byte_data(client, sw1, sw2); | |
54 | } | |
55 | ||
56 | static int m52790_command(struct i2c_client *client, unsigned int cmd, | |
57 | void *arg) | |
58 | { | |
59 | struct m52790_state *state = i2c_get_clientdata(client); | |
60 | struct v4l2_routing *route = arg; | |
61 | ||
62 | /* Note: audio and video are linked and cannot be switched separately. | |
63 | So audio and video routing commands are identical for this chip. | |
64 | In theory the video amplifier and audio modes could be handled | |
65 | separately for the output, but that seems to be overkill right now. | |
66 | The same holds for implementing an audio mute control, this is now | |
67 | part of the audio output routing. The normal case is that another | |
68 | chip takes care of the actual muting so making it part of the | |
69 | output routing seems to be the right thing to do for now. */ | |
70 | switch (cmd) { | |
71 | case VIDIOC_INT_G_AUDIO_ROUTING: | |
72 | case VIDIOC_INT_G_VIDEO_ROUTING: | |
73 | route->input = state->input; | |
74 | route->output = state->output; | |
75 | break; | |
76 | ||
77 | case VIDIOC_INT_S_AUDIO_ROUTING: | |
78 | case VIDIOC_INT_S_VIDEO_ROUTING: | |
79 | state->input = route->input; | |
80 | state->output = route->output; | |
81 | m52790_write(client); | |
82 | break; | |
83 | ||
84 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
85 | case VIDIOC_DBG_G_REGISTER: | |
86 | case VIDIOC_DBG_S_REGISTER: | |
87 | { | |
88 | struct v4l2_register *reg = arg; | |
89 | ||
90 | if (!v4l2_chip_match_i2c_client(client, | |
91 | reg->match_type, reg->match_chip)) | |
92 | return -EINVAL; | |
93 | if (!capable(CAP_SYS_ADMIN)) | |
94 | return -EPERM; | |
95 | if (reg->reg != 0) | |
96 | return -EINVAL; | |
97 | if (cmd == VIDIOC_DBG_G_REGISTER) | |
98 | reg->val = state->input | state->output; | |
99 | else { | |
100 | state->input = reg->val & 0x0303; | |
101 | state->output = reg->val & ~0x0303; | |
102 | m52790_write(client); | |
103 | } | |
104 | break; | |
105 | } | |
106 | #endif | |
107 | ||
108 | case VIDIOC_G_CHIP_IDENT: | |
109 | return v4l2_chip_ident_i2c_client(client, arg, | |
110 | V4L2_IDENT_M52790, 0); | |
111 | ||
112 | case VIDIOC_LOG_STATUS: | |
113 | v4l_info(client, "Switch 1: %02x\n", | |
114 | (state->input | state->output) & 0xff); | |
115 | v4l_info(client, "Switch 2: %02x\n", | |
116 | (state->input | state->output) >> 8); | |
117 | break; | |
118 | ||
119 | default: | |
120 | return -EINVAL; | |
121 | } | |
122 | return 0; | |
123 | } | |
124 | ||
125 | /* ----------------------------------------------------------------------- */ | |
126 | ||
127 | /* i2c implementation */ | |
128 | ||
d2653e92 JD |
129 | static int m52790_probe(struct i2c_client *client, |
130 | const struct i2c_device_id *id) | |
761dacd2 HV |
131 | { |
132 | struct m52790_state *state; | |
133 | ||
134 | /* Check if the adapter supports the needed features */ | |
135 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
136 | return -EIO; | |
137 | ||
761dacd2 HV |
138 | v4l_info(client, "chip found @ 0x%x (%s)\n", |
139 | client->addr << 1, client->adapter->name); | |
140 | ||
141 | state = kmalloc(sizeof(struct m52790_state), GFP_KERNEL); | |
142 | if (state == NULL) | |
143 | return -ENOMEM; | |
144 | ||
145 | state->input = M52790_IN_TUNER; | |
146 | state->output = M52790_OUT_STEREO; | |
147 | i2c_set_clientdata(client, state); | |
148 | m52790_write(client); | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static int m52790_remove(struct i2c_client *client) | |
153 | { | |
154 | kfree(i2c_get_clientdata(client)); | |
155 | return 0; | |
156 | } | |
157 | ||
158 | /* ----------------------------------------------------------------------- */ | |
159 | ||
af294867 JD |
160 | static const struct i2c_device_id m52790_id[] = { |
161 | { "m52790", 0 }, | |
162 | { } | |
163 | }; | |
164 | MODULE_DEVICE_TABLE(i2c, m52790_id); | |
165 | ||
761dacd2 HV |
166 | static struct v4l2_i2c_driver_data v4l2_i2c_data = { |
167 | .name = "m52790", | |
168 | .driverid = I2C_DRIVERID_M52790, | |
169 | .command = m52790_command, | |
170 | .probe = m52790_probe, | |
171 | .remove = m52790_remove, | |
af294867 | 172 | .id_table = m52790_id, |
761dacd2 | 173 | }; |