diff options
Diffstat (limited to 'drivers/media/video/vp27smpx.c')
| -rw-r--r-- | drivers/media/video/vp27smpx.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/drivers/media/video/vp27smpx.c b/drivers/media/video/vp27smpx.c new file mode 100644 index 0000000..63002e0 --- /dev/null +++ b/drivers/media/video/vp27smpx.c @@ -0,0 +1,212 @@ +/* + * vp27smpx - driver version 0.0.1 + * + * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> + * + * Based on a tvaudio patch from Takahiro Adachi <tadachi@tadachi-net.com> + * and Kazuhiko Kawakami <kazz-0@mail.goo.ne.jp> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/ioctl.h> +#include <asm/uaccess.h> +#include <linux/i2c.h> +#include <linux/i2c-id.h> +#include <linux/videodev.h> +#include <media/v4l2-common.h> +#include <media/v4l2-chip-ident.h> + +MODULE_DESCRIPTION("vp27smpx driver"); +MODULE_AUTHOR("Hans Verkuil"); +MODULE_LICENSE("GPL"); + +static unsigned short normal_i2c[] = { 0xb6 >> 1, I2C_CLIENT_END }; + + +I2C_CLIENT_INSMOD; + +/* ----------------------------------------------------------------------- */ + +struct vp27smpx_state { + int radio; + u32 audmode; +}; + +static void vp27smpx_set_audmode(struct i2c_client *client, u32 audmode) +{ + struct vp27smpx_state *state = i2c_get_clientdata(client); + u8 data[3] = { 0x00, 0x00, 0x04 }; + + switch (audmode) { + case V4L2_TUNER_MODE_MONO: + case V4L2_TUNER_MODE_LANG1: + break; + case V4L2_TUNER_MODE_STEREO: + case V4L2_TUNER_MODE_LANG1_LANG2: + data[1] = 0x01; + break; + case V4L2_TUNER_MODE_LANG2: + data[1] = 0x02; + break; + } + + if (i2c_master_send(client, data, sizeof(data)) != sizeof(data)) { + v4l_err(client, "%s: I/O error setting audmode\n", client->name); + } + else { + state->audmode = audmode; + } +} + +static int vp27smpx_command(struct i2c_client *client, unsigned int cmd, + void *arg) +{ + struct vp27smpx_state *state = i2c_get_clientdata(client); + struct v4l2_tuner *vt = arg; + + switch (cmd) { + case AUDC_SET_RADIO: + state->radio = 1; + break; + + case VIDIOC_S_STD: + state->radio = 0; + break; + + case VIDIOC_S_TUNER: + if (!state->radio) + vp27smpx_set_audmode(client, vt->audmode); + break; + + case VIDIOC_G_TUNER: + if (state->radio) + break; + vt->audmode = state->audmode; + vt->capability = V4L2_TUNER_CAP_STEREO | + V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2; + vt->rxsubchans = V4L2_TUNER_SUB_MONO; + break; + + case VIDIOC_G_CHIP_IDENT: + return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_VP27SMPX, 0); + + case VIDIOC_LOG_STATUS: + v4l_info(client, "Audio Mode: %u%s\n", state->audmode, + state->radio ? " (Radio)" : ""); + break; + + default: + return -EINVAL; + } + return 0; +} + +/* ----------------------------------------------------------------------- */ + +/* i2c implementation */ + +/* + * Generic i2c probe + * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' + */ + +static struct i2c_driver i2c_driver; + +static int vp27smpx_attach(struct i2c_adapter *adapter, int address, int kind) +{ + struct i2c_client *client; + struct vp27smpx_state *state; + + /* Check if the adapter supports the needed features */ + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return 0; + + client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL); + if (client == 0) + return -ENOMEM; + + client->addr = address; + client->adapter = adapter; + client->driver = &i2c_driver; + snprintf(client->name, sizeof(client->name) - 1, "vp27smpx"); + + v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name); + + state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL); + if (state == NULL) { + kfree(client); + return -ENOMEM; + } + state->audmode = V4L2_TUNER_MODE_STEREO; + i2c_set_clientdata(client, state); + + /* initialize vp27smpx */ + vp27smpx_set_audmode(client, state->audmode); + i2c_attach_client(client); + + return 0; +} + +static int vp27smpx_probe(struct i2c_adapter *adapter) +{ + if (adapter->class & I2C_CLASS_TV_ANALOG) + return i2c_probe(adapter, &addr_data, vp27smpx_attach); + return 0; +} + +static int vp27smpx_detach(struct i2c_client *client) +{ + struct vp27smpx_state *state = i2c_get_clientdata(client); + int err; + + err = i2c_detach_client(client); + if (err) { + return err; + } + kfree(state); + kfree(client); + + return 0; +} + +/* ----------------------------------------------------------------------- */ + +/* i2c implementation */ +static struct i2c_driver i2c_driver = { + .driver = { + .name = "vp27smpx", + }, + .id = I2C_DRIVERID_VP27SMPX, + .attach_adapter = vp27smpx_probe, + .detach_client = vp27smpx_detach, + .command = vp27smpx_command, +}; + + +static int __init vp27smpx_init_module(void) +{ + return i2c_add_driver(&i2c_driver); +} + +static void __exit vp27smpx_cleanup_module(void) +{ + i2c_del_driver(&i2c_driver); +} + +module_init(vp27smpx_init_module); +module_exit(vp27smpx_cleanup_module); |