2 * m52790 i2c ivtv driver.
3 * Copyright (C) 2007 Hans Verkuil
5 * A/V source switching Mitsubishi M52790SP/FP
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.
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.
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.
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/videodev2.h>
30 #include <media/m52790.h>
31 #include <media/v4l2-device.h>
32 #include <media/v4l2-chip-ident.h>
33 #include <media/v4l2-i2c-drv.h>
35 MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch");
36 MODULE_AUTHOR("Hans Verkuil");
37 MODULE_LICENSE("GPL");
41 struct v4l2_subdev sd;
46 static inline struct m52790_state *to_state(struct v4l2_subdev *sd)
48 return container_of(sd, struct m52790_state, sd);
51 /* ----------------------------------------------------------------------- */
53 static int m52790_write(struct v4l2_subdev *sd)
55 struct m52790_state *state = to_state(sd);
56 struct i2c_client *client = v4l2_get_subdevdata(sd);
58 u8 sw1 = (state->input | state->output) & 0xff;
59 u8 sw2 = (state->input | state->output) >> 8;
61 return i2c_smbus_write_byte_data(client, sw1, sw2);
64 /* Note: audio and video are linked and cannot be switched separately.
65 So audio and video routing commands are identical for this chip.
66 In theory the video amplifier and audio modes could be handled
67 separately for the output, but that seems to be overkill right now.
68 The same holds for implementing an audio mute control, this is now
69 part of the audio output routing. The normal case is that another
70 chip takes care of the actual muting so making it part of the
71 output routing seems to be the right thing to do for now. */
72 static int m52790_s_routing(struct v4l2_subdev *sd, const struct v4l2_routing *route)
74 struct m52790_state *state = to_state(sd);
76 state->input = route->input;
77 state->output = route->output;
82 #ifdef CONFIG_VIDEO_ADV_DEBUG
83 static int m52790_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
85 struct m52790_state *state = to_state(sd);
86 struct i2c_client *client = v4l2_get_subdevdata(sd);
88 if (!v4l2_chip_match_i2c_client(client, ®->match))
90 if (!capable(CAP_SYS_ADMIN))
95 reg->val = state->input | state->output;
99 static int m52790_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
101 struct m52790_state *state = to_state(sd);
102 struct i2c_client *client = v4l2_get_subdevdata(sd);
104 if (!v4l2_chip_match_i2c_client(client, ®->match))
106 if (!capable(CAP_SYS_ADMIN))
110 state->input = reg->val & 0x0303;
111 state->output = reg->val & ~0x0303;
117 static int m52790_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
119 struct i2c_client *client = v4l2_get_subdevdata(sd);
121 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_M52790, 0);
124 static int m52790_log_status(struct v4l2_subdev *sd)
126 struct m52790_state *state = to_state(sd);
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);
135 static int m52790_command(struct i2c_client *client, unsigned cmd, void *arg)
137 return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
140 /* ----------------------------------------------------------------------- */
142 static const struct v4l2_subdev_core_ops m52790_core_ops = {
143 .log_status = m52790_log_status,
144 .g_chip_ident = m52790_g_chip_ident,
145 #ifdef CONFIG_VIDEO_ADV_DEBUG
146 .g_register = m52790_g_register,
147 .s_register = m52790_s_register,
151 static const struct v4l2_subdev_audio_ops m52790_audio_ops = {
152 .s_routing = m52790_s_routing,
155 static const struct v4l2_subdev_video_ops m52790_video_ops = {
156 .s_routing = m52790_s_routing,
159 static const struct v4l2_subdev_ops m52790_ops = {
160 .core = &m52790_core_ops,
161 .audio = &m52790_audio_ops,
162 .video = &m52790_video_ops,
165 /* ----------------------------------------------------------------------- */
167 /* i2c implementation */
169 static int m52790_probe(struct i2c_client *client,
170 const struct i2c_device_id *id)
172 struct m52790_state *state;
173 struct v4l2_subdev *sd;
175 /* Check if the adapter supports the needed features */
176 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
179 v4l_info(client, "chip found @ 0x%x (%s)\n",
180 client->addr << 1, client->adapter->name);
182 state = kmalloc(sizeof(struct m52790_state), GFP_KERNEL);
187 v4l2_i2c_subdev_init(sd, client, &m52790_ops);
188 state->input = M52790_IN_TUNER;
189 state->output = M52790_OUT_STEREO;
194 static int m52790_remove(struct i2c_client *client)
196 struct v4l2_subdev *sd = i2c_get_clientdata(client);
198 v4l2_device_unregister_subdev(sd);
203 /* ----------------------------------------------------------------------- */
205 static const struct i2c_device_id m52790_id[] = {
209 MODULE_DEVICE_TABLE(i2c, m52790_id);
211 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
213 .driverid = I2C_DRIVERID_M52790,
214 .command = m52790_command,
215 .probe = m52790_probe,
216 .remove = m52790_remove,
217 .id_table = m52790_id,