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/videodev.h>
30 #include <media/m52790.h>
31 #include <media/v4l2-common.h>
32 #include <media/v4l2-chip-ident.h>
33 #include <media/v4l2-i2c-drv-legacy.h>
35 MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch");
36 MODULE_AUTHOR("Hans Verkuil");
37 MODULE_LICENSE("GPL");
39 static unsigned short normal_i2c
[] = { 0x90 >> 1, I2C_CLIENT_END
};
49 /* ----------------------------------------------------------------------- */
51 static int m52790_write(struct i2c_client
*client
)
53 struct m52790_state
*state
= i2c_get_clientdata(client
);
54 u8 sw1
= (state
->input
| state
->output
) & 0xff;
55 u8 sw2
= (state
->input
| state
->output
) >> 8;
57 return i2c_smbus_write_byte_data(client
, sw1
, sw2
);
60 static int m52790_command(struct i2c_client
*client
, unsigned int cmd
,
63 struct m52790_state
*state
= i2c_get_clientdata(client
);
64 struct v4l2_routing
*route
= arg
;
66 /* Note: audio and video are linked and cannot be switched separately.
67 So audio and video routing commands are identical for this chip.
68 In theory the video amplifier and audio modes could be handled
69 separately for the output, but that seems to be overkill right now.
70 The same holds for implementing an audio mute control, this is now
71 part of the audio output routing. The normal case is that another
72 chip takes care of the actual muting so making it part of the
73 output routing seems to be the right thing to do for now. */
75 case VIDIOC_INT_G_AUDIO_ROUTING
:
76 case VIDIOC_INT_G_VIDEO_ROUTING
:
77 route
->input
= state
->input
;
78 route
->output
= state
->output
;
81 case VIDIOC_INT_S_AUDIO_ROUTING
:
82 case VIDIOC_INT_S_VIDEO_ROUTING
:
83 state
->input
= route
->input
;
84 state
->output
= route
->output
;
88 #ifdef CONFIG_VIDEO_ADV_DEBUG
89 case VIDIOC_DBG_G_REGISTER
:
90 case VIDIOC_DBG_S_REGISTER
:
92 struct v4l2_register
*reg
= arg
;
94 if (!v4l2_chip_match_i2c_client(client
,
95 reg
->match_type
, reg
->match_chip
))
97 if (!capable(CAP_SYS_ADMIN
))
101 if (cmd
== VIDIOC_DBG_G_REGISTER
)
102 reg
->val
= state
->input
| state
->output
;
104 state
->input
= reg
->val
& 0x0303;
105 state
->output
= reg
->val
& ~0x0303;
106 m52790_write(client
);
112 case VIDIOC_G_CHIP_IDENT
:
113 return v4l2_chip_ident_i2c_client(client
, arg
,
114 V4L2_IDENT_M52790
, 0);
116 case VIDIOC_LOG_STATUS
:
117 v4l_info(client
, "Switch 1: %02x\n",
118 (state
->input
| state
->output
) & 0xff);
119 v4l_info(client
, "Switch 2: %02x\n",
120 (state
->input
| state
->output
) >> 8);
129 /* ----------------------------------------------------------------------- */
131 /* i2c implementation */
133 static int m52790_probe(struct i2c_client
*client
)
135 struct m52790_state
*state
;
137 /* Check if the adapter supports the needed features */
138 if (!i2c_check_functionality(client
->adapter
, I2C_FUNC_SMBUS_BYTE_DATA
))
141 snprintf(client
->name
, sizeof(client
->name
) - 1, "m52790");
143 v4l_info(client
, "chip found @ 0x%x (%s)\n",
144 client
->addr
<< 1, client
->adapter
->name
);
146 state
= kmalloc(sizeof(struct m52790_state
), GFP_KERNEL
);
150 state
->input
= M52790_IN_TUNER
;
151 state
->output
= M52790_OUT_STEREO
;
152 i2c_set_clientdata(client
, state
);
153 m52790_write(client
);
157 static int m52790_remove(struct i2c_client
*client
)
159 kfree(i2c_get_clientdata(client
));
163 /* ----------------------------------------------------------------------- */
165 static struct v4l2_i2c_driver_data v4l2_i2c_data
= {
167 .driverid
= I2C_DRIVERID_M52790
,
168 .command
= m52790_command
,
169 .probe
= m52790_probe
,
170 .remove
= m52790_remove
,