blob: 5e1c9a81984ca837955d2f67a895e5265bb37e6a [file] [log] [blame]
Hans Verkuil761dacd2007-10-30 05:41:25 -03001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/slab.h>
Hans Verkuil761dacd2007-10-30 05:41:25 -030026#include <linux/ioctl.h>
27#include <asm/uaccess.h>
28#include <linux/i2c.h>
Hans Verkuil33b687c2008-07-25 05:32:50 -030029#include <linux/videodev2.h>
Hans Verkuil761dacd2007-10-30 05:41:25 -030030#include <media/m52790.h>
Hans Verkuil5d302f2e2008-11-29 12:51:32 -030031#include <media/v4l2-device.h>
Hans Verkuil761dacd2007-10-30 05:41:25 -030032#include <media/v4l2-chip-ident.h>
Hans Verkuil761dacd2007-10-30 05:41:25 -030033
34MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch");
35MODULE_AUTHOR("Hans Verkuil");
36MODULE_LICENSE("GPL");
37
Hans Verkuil761dacd2007-10-30 05:41:25 -030038
39struct m52790_state {
Hans Verkuil5d302f2e2008-11-29 12:51:32 -030040 struct v4l2_subdev sd;
Hans Verkuil761dacd2007-10-30 05:41:25 -030041 u16 input;
42 u16 output;
43};
44
Hans Verkuil5d302f2e2008-11-29 12:51:32 -030045static inline struct m52790_state *to_state(struct v4l2_subdev *sd)
46{
47 return container_of(sd, struct m52790_state, sd);
48}
49
Hans Verkuil761dacd2007-10-30 05:41:25 -030050/* ----------------------------------------------------------------------- */
51
Hans Verkuil5d302f2e2008-11-29 12:51:32 -030052static int m52790_write(struct v4l2_subdev *sd)
Hans Verkuil761dacd2007-10-30 05:41:25 -030053{
Hans Verkuil5d302f2e2008-11-29 12:51:32 -030054 struct m52790_state *state = to_state(sd);
55 struct i2c_client *client = v4l2_get_subdevdata(sd);
56
Hans Verkuil761dacd2007-10-30 05:41:25 -030057 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
Hans Verkuil5d302f2e2008-11-29 12:51:32 -030063/* 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. */
Hans Verkuil5325b422009-04-02 11:26:22 -030071static int m52790_s_routing(struct v4l2_subdev *sd,
72 u32 input, u32 output, u32 config)
Hans Verkuil761dacd2007-10-30 05:41:25 -030073{
Hans Verkuil5d302f2e2008-11-29 12:51:32 -030074 struct m52790_state *state = to_state(sd);
Hans Verkuil761dacd2007-10-30 05:41:25 -030075
Hans Verkuil5325b422009-04-02 11:26:22 -030076 state->input = input;
77 state->output = output;
Hans Verkuil5d302f2e2008-11-29 12:51:32 -030078 m52790_write(sd);
Hans Verkuil761dacd2007-10-30 05:41:25 -030079 return 0;
80}
81
Hans Verkuil5d302f2e2008-11-29 12:51:32 -030082#ifdef CONFIG_VIDEO_ADV_DEBUG
Hans Verkuilaecde8b52008-12-30 07:14:19 -030083static int m52790_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
Hans Verkuil5d302f2e2008-11-29 12:51:32 -030084{
85 struct m52790_state *state = to_state(sd);
86 struct i2c_client *client = v4l2_get_subdevdata(sd);
87
Hans Verkuilaecde8b52008-12-30 07:14:19 -030088 if (!v4l2_chip_match_i2c_client(client, &reg->match))
Hans Verkuil5d302f2e2008-11-29 12:51:32 -030089 return -EINVAL;
90 if (!capable(CAP_SYS_ADMIN))
91 return -EPERM;
92 if (reg->reg != 0)
93 return -EINVAL;
Hans Verkuilaecde8b52008-12-30 07:14:19 -030094 reg->size = 1;
Hans Verkuil5d302f2e2008-11-29 12:51:32 -030095 reg->val = state->input | state->output;
96 return 0;
97}
98
Hans Verkuilaecde8b52008-12-30 07:14:19 -030099static int m52790_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
Hans Verkuil5d302f2e2008-11-29 12:51:32 -0300100{
101 struct m52790_state *state = to_state(sd);
102 struct i2c_client *client = v4l2_get_subdevdata(sd);
103
Hans Verkuilaecde8b52008-12-30 07:14:19 -0300104 if (!v4l2_chip_match_i2c_client(client, &reg->match))
Hans Verkuil5d302f2e2008-11-29 12:51:32 -0300105 return -EINVAL;
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);
113 return 0;
114}
115#endif
116
Hans Verkuilaecde8b52008-12-30 07:14:19 -0300117static int m52790_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
Hans Verkuil5d302f2e2008-11-29 12:51:32 -0300118{
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
124static 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
Hans Verkuil5d302f2e2008-11-29 12:51:32 -0300135/* ----------------------------------------------------------------------- */
136
137static 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
146static const struct v4l2_subdev_audio_ops m52790_audio_ops = {
147 .s_routing = m52790_s_routing,
148};
149
150static const struct v4l2_subdev_video_ops m52790_video_ops = {
151 .s_routing = m52790_s_routing,
152};
153
154static const struct v4l2_subdev_ops m52790_ops = {
155 .core = &m52790_core_ops,
156 .audio = &m52790_audio_ops,
157 .video = &m52790_video_ops,
158};
159
Hans Verkuil761dacd2007-10-30 05:41:25 -0300160/* ----------------------------------------------------------------------- */
161
162/* i2c implementation */
163
Jean Delvared2653e92008-04-29 23:11:39 +0200164static int m52790_probe(struct i2c_client *client,
165 const struct i2c_device_id *id)
Hans Verkuil761dacd2007-10-30 05:41:25 -0300166{
167 struct m52790_state *state;
Hans Verkuil5d302f2e2008-11-29 12:51:32 -0300168 struct v4l2_subdev *sd;
Hans Verkuil761dacd2007-10-30 05:41:25 -0300169
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
Hans Verkuil761dacd2007-10-30 05:41:25 -0300174 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
Hans Verkuil5d302f2e2008-11-29 12:51:32 -0300181 sd = &state->sd;
182 v4l2_i2c_subdev_init(sd, client, &m52790_ops);
Hans Verkuil761dacd2007-10-30 05:41:25 -0300183 state->input = M52790_IN_TUNER;
184 state->output = M52790_OUT_STEREO;
Hans Verkuil5d302f2e2008-11-29 12:51:32 -0300185 m52790_write(sd);
Hans Verkuil761dacd2007-10-30 05:41:25 -0300186 return 0;
187}
188
189static int m52790_remove(struct i2c_client *client)
190{
Hans Verkuil5d302f2e2008-11-29 12:51:32 -0300191 struct v4l2_subdev *sd = i2c_get_clientdata(client);
192
193 v4l2_device_unregister_subdev(sd);
194 kfree(to_state(sd));
Hans Verkuil761dacd2007-10-30 05:41:25 -0300195 return 0;
196}
197
198/* ----------------------------------------------------------------------- */
199
Jean Delvareaf294862008-05-18 20:49:40 +0200200static const struct i2c_device_id m52790_id[] = {
201 { "m52790", 0 },
202 { }
203};
204MODULE_DEVICE_TABLE(i2c, m52790_id);
205
Hans Verkuild30f60b2010-09-15 15:18:29 -0300206static 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,
Hans Verkuil761dacd2007-10-30 05:41:25 -0300214};
Hans Verkuild30f60b2010-09-15 15:18:29 -0300215
216static __init int init_m52790(void)
217{
218 return i2c_add_driver(&m52790_driver);
219}
220
221static __exit void exit_m52790(void)
222{
223 i2c_del_driver(&m52790_driver);
224}
225
226module_init(init_m52790);
227module_exit(exit_m52790);