212 lines
5.3 KiB
C
212 lines
5.3 KiB
C
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/*
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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/slab.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/videodev2.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-chip-ident.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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struct v4l2_subdev sd;
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int radio;
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u32 audmode;
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};
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static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct vp27smpx_state, sd);
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}
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static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode)
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{
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struct vp27smpx_state *state = to_state(sd);
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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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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v4l2_err(sd, "I/O error setting audmode\n");
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else
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state->audmode = audmode;
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}
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static int vp27smpx_s_radio(struct v4l2_subdev *sd)
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{
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struct vp27smpx_state *state = to_state(sd);
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state->radio = 1;
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return 0;
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}
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static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
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{
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struct vp27smpx_state *state = to_state(sd);
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state->radio = 0;
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return 0;
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}
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static int vp27smpx_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
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{
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struct vp27smpx_state *state = to_state(sd);
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if (!state->radio)
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vp27smpx_set_audmode(sd, vt->audmode);
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return 0;
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}
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static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
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{
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struct vp27smpx_state *state = to_state(sd);
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if (state->radio)
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return 0;
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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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return 0;
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}
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static int vp27smpx_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_VP27SMPX, 0);
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}
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static int vp27smpx_log_status(struct v4l2_subdev *sd)
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{
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struct vp27smpx_state *state = to_state(sd);
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v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode,
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state->radio ? " (Radio)" : "");
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static const struct v4l2_subdev_core_ops vp27smpx_core_ops = {
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.log_status = vp27smpx_log_status,
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.g_chip_ident = vp27smpx_g_chip_ident,
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.s_std = vp27smpx_s_std,
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};
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static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = {
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.s_radio = vp27smpx_s_radio,
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.s_tuner = vp27smpx_s_tuner,
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.g_tuner = vp27smpx_g_tuner,
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};
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static const struct v4l2_subdev_ops vp27smpx_ops = {
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.core = &vp27smpx_core_ops,
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.tuner = &vp27smpx_tuner_ops,
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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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const struct i2c_device_id *id)
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{
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struct vp27smpx_state *state;
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struct v4l2_subdev *sd;
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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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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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sd = &state->sd;
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v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops);
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state->audmode = V4L2_TUNER_MODE_STEREO;
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/* initialize vp27smpx */
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vp27smpx_set_audmode(sd, 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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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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v4l2_device_unregister_subdev(sd);
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kfree(to_state(sd));
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static const struct i2c_device_id vp27smpx_id[] = {
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{ "vp27smpx", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, vp27smpx_id);
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static struct i2c_driver vp27smpx_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "vp27smpx",
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},
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.probe = vp27smpx_probe,
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.remove = vp27smpx_remove,
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.id_table = vp27smpx_id,
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};
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module_i2c_driver(vp27smpx_driver);
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