169 lines
4.6 KiB
C
169 lines
4.6 KiB
C
/*
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* m52790 i2c ivtv driver.
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* Copyright (C) 2007 Hans Verkuil
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*
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* A/V source switching Mitsubishi M52790SP/FP
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/ioctl.h>
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#include <asm/uaccess.h>
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#include <linux/i2c.h>
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#include <linux/i2c-id.h>
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#include <linux/videodev.h>
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#include <media/m52790.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-chip-ident.h>
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#include <media/v4l2-i2c-drv.h>
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MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch");
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MODULE_AUTHOR("Hans Verkuil");
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MODULE_LICENSE("GPL");
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struct m52790_state {
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u16 input;
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u16 output;
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};
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/* ----------------------------------------------------------------------- */
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static int m52790_write(struct i2c_client *client)
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{
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struct m52790_state *state = i2c_get_clientdata(client);
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u8 sw1 = (state->input | state->output) & 0xff;
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u8 sw2 = (state->input | state->output) >> 8;
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return i2c_smbus_write_byte_data(client, sw1, sw2);
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}
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static int m52790_command(struct i2c_client *client, unsigned int cmd,
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void *arg)
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{
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struct m52790_state *state = i2c_get_clientdata(client);
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struct v4l2_routing *route = arg;
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/* Note: audio and video are linked and cannot be switched separately.
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So audio and video routing commands are identical for this chip.
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In theory the video amplifier and audio modes could be handled
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separately for the output, but that seems to be overkill right now.
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The same holds for implementing an audio mute control, this is now
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part of the audio output routing. The normal case is that another
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chip takes care of the actual muting so making it part of the
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output routing seems to be the right thing to do for now. */
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switch (cmd) {
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case VIDIOC_INT_G_AUDIO_ROUTING:
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case VIDIOC_INT_G_VIDEO_ROUTING:
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route->input = state->input;
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route->output = state->output;
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break;
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case VIDIOC_INT_S_AUDIO_ROUTING:
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case VIDIOC_INT_S_VIDEO_ROUTING:
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state->input = route->input;
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state->output = route->output;
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m52790_write(client);
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break;
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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case VIDIOC_DBG_G_REGISTER:
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case VIDIOC_DBG_S_REGISTER:
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{
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struct v4l2_register *reg = arg;
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if (!v4l2_chip_match_i2c_client(client,
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reg->match_type, reg->match_chip))
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return -EINVAL;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (reg->reg != 0)
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return -EINVAL;
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if (cmd == VIDIOC_DBG_G_REGISTER)
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reg->val = state->input | state->output;
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else {
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state->input = reg->val & 0x0303;
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state->output = reg->val & ~0x0303;
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m52790_write(client);
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}
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break;
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}
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#endif
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case VIDIOC_G_CHIP_IDENT:
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return v4l2_chip_ident_i2c_client(client, arg,
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V4L2_IDENT_M52790, 0);
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case VIDIOC_LOG_STATUS:
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v4l_info(client, "Switch 1: %02x\n",
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(state->input | state->output) & 0xff);
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v4l_info(client, "Switch 2: %02x\n",
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(state->input | state->output) >> 8);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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/* i2c implementation */
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static int m52790_probe(struct i2c_client *client)
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{
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struct m52790_state *state;
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/* Check if the adapter supports the needed features */
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -EIO;
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snprintf(client->name, sizeof(client->name) - 1, "m52790");
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v4l_info(client, "chip found @ 0x%x (%s)\n",
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client->addr << 1, client->adapter->name);
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state = kmalloc(sizeof(struct m52790_state), GFP_KERNEL);
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if (state == NULL)
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return -ENOMEM;
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state->input = M52790_IN_TUNER;
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state->output = M52790_OUT_STEREO;
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i2c_set_clientdata(client, state);
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m52790_write(client);
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return 0;
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}
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static int m52790_remove(struct i2c_client *client)
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{
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kfree(i2c_get_clientdata(client));
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static struct v4l2_i2c_driver_data v4l2_i2c_data = {
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.name = "m52790",
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.driverid = I2C_DRIVERID_M52790,
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.command = m52790_command,
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.probe = m52790_probe,
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.remove = m52790_remove,
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};
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