diff options
Diffstat (limited to 'drivers/media/video/ths7303.c')
| -rw-r--r-- | drivers/media/video/ths7303.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/drivers/media/video/ths7303.c b/drivers/media/video/ths7303.c new file mode 100644 index 00000000000..21781f8a0e8 --- /dev/null +++ b/drivers/media/video/ths7303.c @@ -0,0 +1,151 @@ +/* + * ths7303- THS7303 Video Amplifier driver + * + * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/ + * + * 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 version 2. + * + * This program is distributed .as is. WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/ctype.h> +#include <linux/i2c.h> +#include <linux/device.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/uaccess.h> +#include <linux/videodev2.h> + +#include <media/v4l2-device.h> +#include <media/v4l2-subdev.h> +#include <media/v4l2-chip-ident.h> + +MODULE_DESCRIPTION("TI THS7303 video amplifier driver"); +MODULE_AUTHOR("Chaithrika U S"); +MODULE_LICENSE("GPL"); + +static int debug; +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Debug level 0-1"); + +/* following function is used to set ths7303 */ +static int ths7303_setvalue(struct v4l2_subdev *sd, v4l2_std_id std) +{ + int err = 0; + u8 val; + struct i2c_client *client; + + client = v4l2_get_subdevdata(sd); + + if (std & (V4L2_STD_ALL & ~V4L2_STD_SECAM)) { + val = 0x02; + v4l2_dbg(1, debug, sd, "setting value for SDTV format\n"); + } else { + val = 0x00; + v4l2_dbg(1, debug, sd, "disabling all channels\n"); + } + + err |= i2c_smbus_write_byte_data(client, 0x01, val); + err |= i2c_smbus_write_byte_data(client, 0x02, val); + err |= i2c_smbus_write_byte_data(client, 0x03, val); + + if (err) + v4l2_err(sd, "write failed\n"); + + return err; +} + +static int ths7303_s_std_output(struct v4l2_subdev *sd, v4l2_std_id norm) +{ + return ths7303_setvalue(sd, norm); +} + +static int ths7303_g_chip_ident(struct v4l2_subdev *sd, + struct v4l2_dbg_chip_ident *chip) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + + return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_THS7303, 0); +} + +static const struct v4l2_subdev_video_ops ths7303_video_ops = { + .s_std_output = ths7303_s_std_output, +}; + +static const struct v4l2_subdev_core_ops ths7303_core_ops = { + .g_chip_ident = ths7303_g_chip_ident, +}; + +static const struct v4l2_subdev_ops ths7303_ops = { + .core = &ths7303_core_ops, + .video = &ths7303_video_ops, +}; + +static int ths7303_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct v4l2_subdev *sd; + v4l2_std_id std_id = V4L2_STD_NTSC; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + v4l_info(client, "chip found @ 0x%x (%s)\n", + client->addr << 1, client->adapter->name); + + sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); + if (sd == NULL) + return -ENOMEM; + + v4l2_i2c_subdev_init(sd, client, &ths7303_ops); + + return ths7303_setvalue(sd, std_id); +} + +static int ths7303_remove(struct i2c_client *client) +{ + struct v4l2_subdev *sd = i2c_get_clientdata(client); + + v4l2_device_unregister_subdev(sd); + kfree(sd); + + return 0; +} + +static const struct i2c_device_id ths7303_id[] = { + {"ths7303", 0}, + {}, +}; + +MODULE_DEVICE_TABLE(i2c, ths7303_id); + +static struct i2c_driver ths7303_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "ths7303", + }, + .probe = ths7303_probe, + .remove = ths7303_remove, + .id_table = ths7303_id, +}; + +static int __init ths7303_init(void) +{ + return i2c_add_driver(&ths7303_driver); +} + +static void __exit ths7303_exit(void) +{ + i2c_del_driver(&ths7303_driver); +} + +module_init(ths7303_init); +module_exit(ths7303_exit); + |