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Commit | Line | Data |
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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> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
761dacd2 HV |
26 | #include <linux/ioctl.h> |
27 | #include <asm/uaccess.h> | |
28 | #include <linux/i2c.h> | |
33b687cf | 29 | #include <linux/videodev2.h> |
761dacd2 | 30 | #include <media/m52790.h> |
5d302f2e | 31 | #include <media/v4l2-device.h> |
761dacd2 | 32 | #include <media/v4l2-chip-ident.h> |
761dacd2 HV |
33 | |
34 | MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch"); | |
35 | MODULE_AUTHOR("Hans Verkuil"); | |
36 | MODULE_LICENSE("GPL"); | |
37 | ||
761dacd2 HV |
38 | |
39 | struct m52790_state { | |
5d302f2e | 40 | struct v4l2_subdev sd; |
761dacd2 HV |
41 | u16 input; |
42 | u16 output; | |
43 | }; | |
44 | ||
5d302f2e HV |
45 | static inline struct m52790_state *to_state(struct v4l2_subdev *sd) |
46 | { | |
47 | return container_of(sd, struct m52790_state, sd); | |
48 | } | |
49 | ||
761dacd2 HV |
50 | /* ----------------------------------------------------------------------- */ |
51 | ||
5d302f2e | 52 | static int m52790_write(struct v4l2_subdev *sd) |
761dacd2 | 53 | { |
5d302f2e HV |
54 | struct m52790_state *state = to_state(sd); |
55 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
56 | ||
761dacd2 HV |
57 | u8 sw1 = (state->input | state->output) & 0xff; |
58 | u8 sw2 = (state->input | state->output) >> 8; | |
59 | ||
60 | return i2c_smbus_write_byte_data(client, sw1, sw2); | |
61 | } | |
62 | ||
5d302f2e HV |
63 | /* Note: audio and video are linked and cannot be switched separately. |
64 | So audio and video routing commands are identical for this chip. | |
65 | In theory the video amplifier and audio modes could be handled | |
66 | separately for the output, but that seems to be overkill right now. | |
67 | The same holds for implementing an audio mute control, this is now | |
68 | part of the audio output routing. The normal case is that another | |
69 | chip takes care of the actual muting so making it part of the | |
70 | output routing seems to be the right thing to do for now. */ | |
5325b427 HV |
71 | static int m52790_s_routing(struct v4l2_subdev *sd, |
72 | u32 input, u32 output, u32 config) | |
761dacd2 | 73 | { |
5d302f2e HV |
74 | struct m52790_state *state = to_state(sd); |
75 | ||
5325b427 HV |
76 | state->input = input; |
77 | state->output = output; | |
5d302f2e HV |
78 | m52790_write(sd); |
79 | return 0; | |
80 | } | |
761dacd2 HV |
81 | |
82 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
aecde8b5 | 83 | static int m52790_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) |
5d302f2e HV |
84 | { |
85 | struct m52790_state *state = to_state(sd); | |
86 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
761dacd2 | 87 | |
aecde8b5 | 88 | if (!v4l2_chip_match_i2c_client(client, ®->match)) |
5d302f2e HV |
89 | return -EINVAL; |
90 | if (!capable(CAP_SYS_ADMIN)) | |
91 | return -EPERM; | |
92 | if (reg->reg != 0) | |
93 | return -EINVAL; | |
aecde8b5 | 94 | reg->size = 1; |
5d302f2e HV |
95 | reg->val = state->input | state->output; |
96 | return 0; | |
97 | } | |
761dacd2 | 98 | |
aecde8b5 | 99 | static int m52790_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) |
5d302f2e HV |
100 | { |
101 | struct m52790_state *state = to_state(sd); | |
102 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
761dacd2 | 103 | |
aecde8b5 | 104 | if (!v4l2_chip_match_i2c_client(client, ®->match)) |
761dacd2 | 105 | return -EINVAL; |
5d302f2e HV |
106 | if (!capable(CAP_SYS_ADMIN)) |
107 | return -EPERM; | |
108 | if (reg->reg != 0) | |
109 | return -EINVAL; | |
110 | state->input = reg->val & 0x0303; | |
111 | state->output = reg->val & ~0x0303; | |
112 | m52790_write(sd); | |
761dacd2 HV |
113 | return 0; |
114 | } | |
5d302f2e HV |
115 | #endif |
116 | ||
aecde8b5 | 117 | static int m52790_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) |
5d302f2e HV |
118 | { |
119 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
120 | ||
121 | return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_M52790, 0); | |
122 | } | |
123 | ||
124 | static int m52790_log_status(struct v4l2_subdev *sd) | |
125 | { | |
126 | struct m52790_state *state = to_state(sd); | |
127 | ||
128 | v4l2_info(sd, "Switch 1: %02x\n", | |
129 | (state->input | state->output) & 0xff); | |
130 | v4l2_info(sd, "Switch 2: %02x\n", | |
131 | (state->input | state->output) >> 8); | |
132 | return 0; | |
133 | } | |
134 | ||
5d302f2e HV |
135 | /* ----------------------------------------------------------------------- */ |
136 | ||
137 | static const struct v4l2_subdev_core_ops m52790_core_ops = { | |
138 | .log_status = m52790_log_status, | |
139 | .g_chip_ident = m52790_g_chip_ident, | |
140 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
141 | .g_register = m52790_g_register, | |
142 | .s_register = m52790_s_register, | |
143 | #endif | |
144 | }; | |
145 | ||
146 | static const struct v4l2_subdev_audio_ops m52790_audio_ops = { | |
147 | .s_routing = m52790_s_routing, | |
148 | }; | |
149 | ||
150 | static const struct v4l2_subdev_video_ops m52790_video_ops = { | |
151 | .s_routing = m52790_s_routing, | |
152 | }; | |
153 | ||
154 | static const struct v4l2_subdev_ops m52790_ops = { | |
155 | .core = &m52790_core_ops, | |
156 | .audio = &m52790_audio_ops, | |
157 | .video = &m52790_video_ops, | |
158 | }; | |
761dacd2 HV |
159 | |
160 | /* ----------------------------------------------------------------------- */ | |
161 | ||
162 | /* i2c implementation */ | |
163 | ||
d2653e92 JD |
164 | static int m52790_probe(struct i2c_client *client, |
165 | const struct i2c_device_id *id) | |
761dacd2 HV |
166 | { |
167 | struct m52790_state *state; | |
5d302f2e | 168 | struct v4l2_subdev *sd; |
761dacd2 HV |
169 | |
170 | /* Check if the adapter supports the needed features */ | |
171 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
172 | return -EIO; | |
173 | ||
761dacd2 HV |
174 | v4l_info(client, "chip found @ 0x%x (%s)\n", |
175 | client->addr << 1, client->adapter->name); | |
176 | ||
177 | state = kmalloc(sizeof(struct m52790_state), GFP_KERNEL); | |
178 | if (state == NULL) | |
179 | return -ENOMEM; | |
180 | ||
5d302f2e HV |
181 | sd = &state->sd; |
182 | v4l2_i2c_subdev_init(sd, client, &m52790_ops); | |
761dacd2 HV |
183 | state->input = M52790_IN_TUNER; |
184 | state->output = M52790_OUT_STEREO; | |
5d302f2e | 185 | m52790_write(sd); |
761dacd2 HV |
186 | return 0; |
187 | } | |
188 | ||
189 | static int m52790_remove(struct i2c_client *client) | |
190 | { | |
5d302f2e HV |
191 | struct v4l2_subdev *sd = i2c_get_clientdata(client); |
192 | ||
193 | v4l2_device_unregister_subdev(sd); | |
194 | kfree(to_state(sd)); | |
761dacd2 HV |
195 | return 0; |
196 | } | |
197 | ||
198 | /* ----------------------------------------------------------------------- */ | |
199 | ||
af294867 JD |
200 | static const struct i2c_device_id m52790_id[] = { |
201 | { "m52790", 0 }, | |
202 | { } | |
203 | }; | |
204 | MODULE_DEVICE_TABLE(i2c, m52790_id); | |
205 | ||
d30f60b3 HV |
206 | static struct i2c_driver m52790_driver = { |
207 | .driver = { | |
208 | .owner = THIS_MODULE, | |
209 | .name = "m52790", | |
210 | }, | |
211 | .probe = m52790_probe, | |
212 | .remove = m52790_remove, | |
213 | .id_table = m52790_id, | |
761dacd2 | 214 | }; |
d30f60b3 HV |
215 | |
216 | static __init int init_m52790(void) | |
217 | { | |
218 | return i2c_add_driver(&m52790_driver); | |
219 | } | |
220 | ||
221 | static __exit void exit_m52790(void) | |
222 | { | |
223 | i2c_del_driver(&m52790_driver); | |
224 | } | |
225 | ||
226 | module_init(init_m52790); | |
227 | module_exit(exit_m52790); |