mirror of https://gitee.com/openkylin/linux.git
164 lines
4.1 KiB
C
164 lines
4.1 KiB
C
/*
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* vp27smpx - driver version 0.0.1
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*
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* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
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*
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* Based on a tvaudio patch from Takahiro Adachi <tadachi@tadachi-net.com>
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* and Kazuhiko Kawakami <kazz-0@mail.goo.ne.jp>
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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/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("vp27smpx driver");
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MODULE_AUTHOR("Hans Verkuil");
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MODULE_LICENSE("GPL");
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/* ----------------------------------------------------------------------- */
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struct vp27smpx_state {
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int radio;
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u32 audmode;
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};
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static void vp27smpx_set_audmode(struct i2c_client *client, u32 audmode)
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{
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struct vp27smpx_state *state = i2c_get_clientdata(client);
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u8 data[3] = { 0x00, 0x00, 0x04 };
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switch (audmode) {
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case V4L2_TUNER_MODE_MONO:
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case V4L2_TUNER_MODE_LANG1:
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break;
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case V4L2_TUNER_MODE_STEREO:
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case V4L2_TUNER_MODE_LANG1_LANG2:
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data[1] = 0x01;
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break;
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case V4L2_TUNER_MODE_LANG2:
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data[1] = 0x02;
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break;
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}
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if (i2c_master_send(client, data, sizeof(data)) != sizeof(data))
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v4l_err(client, "%s: I/O error setting audmode\n",
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client->name);
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else
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state->audmode = audmode;
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}
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static int vp27smpx_command(struct i2c_client *client, unsigned cmd, void *arg)
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{
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struct vp27smpx_state *state = i2c_get_clientdata(client);
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struct v4l2_tuner *vt = arg;
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switch (cmd) {
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case AUDC_SET_RADIO:
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state->radio = 1;
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break;
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case VIDIOC_S_STD:
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state->radio = 0;
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break;
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case VIDIOC_S_TUNER:
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if (!state->radio)
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vp27smpx_set_audmode(client, vt->audmode);
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break;
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case VIDIOC_G_TUNER:
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if (state->radio)
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break;
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vt->audmode = state->audmode;
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vt->capability = V4L2_TUNER_CAP_STEREO |
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V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
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vt->rxsubchans = V4L2_TUNER_SUB_MONO;
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break;
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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_VP27SMPX, 0);
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case VIDIOC_LOG_STATUS:
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v4l_info(client, "Audio Mode: %u%s\n", state->audmode,
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state->radio ? " (Radio)" : "");
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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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/*
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* Generic i2c probe
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* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
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*/
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static int vp27smpx_probe(struct i2c_client *client)
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{
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struct vp27smpx_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, "vp27smpx");
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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 = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);
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if (state == NULL)
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return -ENOMEM;
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state->audmode = V4L2_TUNER_MODE_STEREO;
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i2c_set_clientdata(client, state);
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/* initialize vp27smpx */
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vp27smpx_set_audmode(client, state->audmode);
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return 0;
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}
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static int vp27smpx_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 = "vp27smpx",
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.driverid = I2C_DRIVERID_VP27SMPX,
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.command = vp27smpx_command,
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.probe = vp27smpx_probe,
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.remove = vp27smpx_remove,
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};
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