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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> | |
29 | #include <linux/i2c-id.h> | |
33b687cf | 30 | #include <linux/videodev2.h> |
761dacd2 | 31 | #include <media/m52790.h> |
5d302f2e | 32 | #include <media/v4l2-device.h> |
761dacd2 | 33 | #include <media/v4l2-chip-ident.h> |
f69d419a | 34 | #include <media/v4l2-i2c-drv.h> |
761dacd2 HV |
35 | |
36 | MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch"); | |
37 | MODULE_AUTHOR("Hans Verkuil"); | |
38 | MODULE_LICENSE("GPL"); | |
39 | ||
761dacd2 HV |
40 | |
41 | struct m52790_state { | |
5d302f2e | 42 | struct v4l2_subdev sd; |
761dacd2 HV |
43 | u16 input; |
44 | u16 output; | |
45 | }; | |
46 | ||
5d302f2e HV |
47 | static inline struct m52790_state *to_state(struct v4l2_subdev *sd) |
48 | { | |
49 | return container_of(sd, struct m52790_state, sd); | |
50 | } | |
51 | ||
761dacd2 HV |
52 | /* ----------------------------------------------------------------------- */ |
53 | ||
5d302f2e | 54 | static int m52790_write(struct v4l2_subdev *sd) |
761dacd2 | 55 | { |
5d302f2e HV |
56 | struct m52790_state *state = to_state(sd); |
57 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
58 | ||
761dacd2 HV |
59 | u8 sw1 = (state->input | state->output) & 0xff; |
60 | u8 sw2 = (state->input | state->output) >> 8; | |
61 | ||
62 | return i2c_smbus_write_byte_data(client, sw1, sw2); | |
63 | } | |
64 | ||
5d302f2e HV |
65 | /* Note: audio and video are linked and cannot be switched separately. |
66 | So audio and video routing commands are identical for this chip. | |
67 | In theory the video amplifier and audio modes could be handled | |
68 | separately for the output, but that seems to be overkill right now. | |
69 | The same holds for implementing an audio mute control, this is now | |
70 | part of the audio output routing. The normal case is that another | |
71 | chip takes care of the actual muting so making it part of the | |
72 | output routing seems to be the right thing to do for now. */ | |
5325b427 HV |
73 | static int m52790_s_routing(struct v4l2_subdev *sd, |
74 | u32 input, u32 output, u32 config) | |
761dacd2 | 75 | { |
5d302f2e HV |
76 | struct m52790_state *state = to_state(sd); |
77 | ||
5325b427 HV |
78 | state->input = input; |
79 | state->output = output; | |
5d302f2e HV |
80 | m52790_write(sd); |
81 | return 0; | |
82 | } | |
761dacd2 HV |
83 | |
84 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
aecde8b5 | 85 | static int m52790_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) |
5d302f2e HV |
86 | { |
87 | struct m52790_state *state = to_state(sd); | |
88 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
761dacd2 | 89 | |
aecde8b5 | 90 | if (!v4l2_chip_match_i2c_client(client, ®->match)) |
5d302f2e HV |
91 | return -EINVAL; |
92 | if (!capable(CAP_SYS_ADMIN)) | |
93 | return -EPERM; | |
94 | if (reg->reg != 0) | |
95 | return -EINVAL; | |
aecde8b5 | 96 | reg->size = 1; |
5d302f2e HV |
97 | reg->val = state->input | state->output; |
98 | return 0; | |
99 | } | |
761dacd2 | 100 | |
aecde8b5 | 101 | static int m52790_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg) |
5d302f2e HV |
102 | { |
103 | struct m52790_state *state = to_state(sd); | |
104 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
761dacd2 | 105 | |
aecde8b5 | 106 | if (!v4l2_chip_match_i2c_client(client, ®->match)) |
761dacd2 | 107 | return -EINVAL; |
5d302f2e HV |
108 | if (!capable(CAP_SYS_ADMIN)) |
109 | return -EPERM; | |
110 | if (reg->reg != 0) | |
111 | return -EINVAL; | |
112 | state->input = reg->val & 0x0303; | |
113 | state->output = reg->val & ~0x0303; | |
114 | m52790_write(sd); | |
761dacd2 HV |
115 | return 0; |
116 | } | |
5d302f2e HV |
117 | #endif |
118 | ||
aecde8b5 | 119 | static int m52790_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) |
5d302f2e HV |
120 | { |
121 | struct i2c_client *client = v4l2_get_subdevdata(sd); | |
122 | ||
123 | return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_M52790, 0); | |
124 | } | |
125 | ||
126 | static int m52790_log_status(struct v4l2_subdev *sd) | |
127 | { | |
128 | struct m52790_state *state = to_state(sd); | |
129 | ||
130 | v4l2_info(sd, "Switch 1: %02x\n", | |
131 | (state->input | state->output) & 0xff); | |
132 | v4l2_info(sd, "Switch 2: %02x\n", | |
133 | (state->input | state->output) >> 8); | |
134 | return 0; | |
135 | } | |
136 | ||
5d302f2e HV |
137 | /* ----------------------------------------------------------------------- */ |
138 | ||
139 | static const struct v4l2_subdev_core_ops m52790_core_ops = { | |
140 | .log_status = m52790_log_status, | |
141 | .g_chip_ident = m52790_g_chip_ident, | |
142 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
143 | .g_register = m52790_g_register, | |
144 | .s_register = m52790_s_register, | |
145 | #endif | |
146 | }; | |
147 | ||
148 | static const struct v4l2_subdev_audio_ops m52790_audio_ops = { | |
149 | .s_routing = m52790_s_routing, | |
150 | }; | |
151 | ||
152 | static const struct v4l2_subdev_video_ops m52790_video_ops = { | |
153 | .s_routing = m52790_s_routing, | |
154 | }; | |
155 | ||
156 | static const struct v4l2_subdev_ops m52790_ops = { | |
157 | .core = &m52790_core_ops, | |
158 | .audio = &m52790_audio_ops, | |
159 | .video = &m52790_video_ops, | |
160 | }; | |
761dacd2 HV |
161 | |
162 | /* ----------------------------------------------------------------------- */ | |
163 | ||
164 | /* i2c implementation */ | |
165 | ||
d2653e92 JD |
166 | static int m52790_probe(struct i2c_client *client, |
167 | const struct i2c_device_id *id) | |
761dacd2 HV |
168 | { |
169 | struct m52790_state *state; | |
5d302f2e | 170 | struct v4l2_subdev *sd; |
761dacd2 HV |
171 | |
172 | /* Check if the adapter supports the needed features */ | |
173 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
174 | return -EIO; | |
175 | ||
761dacd2 HV |
176 | v4l_info(client, "chip found @ 0x%x (%s)\n", |
177 | client->addr << 1, client->adapter->name); | |
178 | ||
179 | state = kmalloc(sizeof(struct m52790_state), GFP_KERNEL); | |
180 | if (state == NULL) | |
181 | return -ENOMEM; | |
182 | ||
5d302f2e HV |
183 | sd = &state->sd; |
184 | v4l2_i2c_subdev_init(sd, client, &m52790_ops); | |
761dacd2 HV |
185 | state->input = M52790_IN_TUNER; |
186 | state->output = M52790_OUT_STEREO; | |
5d302f2e | 187 | m52790_write(sd); |
761dacd2 HV |
188 | return 0; |
189 | } | |
190 | ||
191 | static int m52790_remove(struct i2c_client *client) | |
192 | { | |
5d302f2e HV |
193 | struct v4l2_subdev *sd = i2c_get_clientdata(client); |
194 | ||
195 | v4l2_device_unregister_subdev(sd); | |
196 | kfree(to_state(sd)); | |
761dacd2 HV |
197 | return 0; |
198 | } | |
199 | ||
200 | /* ----------------------------------------------------------------------- */ | |
201 | ||
af294867 JD |
202 | static const struct i2c_device_id m52790_id[] = { |
203 | { "m52790", 0 }, | |
204 | { } | |
205 | }; | |
206 | MODULE_DEVICE_TABLE(i2c, m52790_id); | |
207 | ||
761dacd2 HV |
208 | static struct v4l2_i2c_driver_data v4l2_i2c_data = { |
209 | .name = "m52790", | |
761dacd2 HV |
210 | .probe = m52790_probe, |
211 | .remove = m52790_remove, | |
af294867 | 212 | .id_table = m52790_id, |
761dacd2 | 213 | }; |