diff options
Diffstat (limited to 'drivers/media/i2c/vp27smpx.c')
| -rw-r--r-- | drivers/media/i2c/vp27smpx.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/media/i2c/vp27smpx.c b/drivers/media/i2c/vp27smpx.c new file mode 100644 index 000000000000..7cfbc9d94a48 --- /dev/null +++ b/drivers/media/i2c/vp27smpx.c @@ -0,0 +1,211 @@ +/* + * 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/slab.h> +#include <linux/ioctl.h> +#include <asm/uaccess.h> +#include <linux/i2c.h> +#include <linux/videodev2.h> +#include <media/v4l2-device.h> +#include <media/v4l2-chip-ident.h> + +MODULE_DESCRIPTION("vp27smpx driver"); +MODULE_AUTHOR("Hans Verkuil"); +MODULE_LICENSE("GPL"); + + +/* ----------------------------------------------------------------------- */ + +struct vp27smpx_state { + struct v4l2_subdev sd; + int radio; + u32 audmode; +}; + +static inline struct vp27smpx_state *to_state(struct v4l2_subdev *sd) +{ + return container_of(sd, struct vp27smpx_state, sd); +} + +static void vp27smpx_set_audmode(struct v4l2_subdev *sd, u32 audmode) +{ + struct vp27smpx_state *state = to_state(sd); + struct i2c_client *client = v4l2_get_subdevdata(sd); + 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)) + v4l2_err(sd, "I/O error setting audmode\n"); + else + state->audmode = audmode; +} + +static int vp27smpx_s_radio(struct v4l2_subdev *sd) +{ + struct vp27smpx_state *state = to_state(sd); + + state->radio = 1; + return 0; +} + +static int vp27smpx_s_std(struct v4l2_subdev *sd, v4l2_std_id norm) +{ + struct vp27smpx_state *state = to_state(sd); + + state->radio = 0; + return 0; +} + +static int vp27smpx_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt) +{ + struct vp27smpx_state *state = to_state(sd); + + if (!state->radio) + vp27smpx_set_audmode(sd, vt->audmode); + return 0; +} + +static int vp27smpx_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt) +{ + struct vp27smpx_state *state = to_state(sd); + + if (state->radio) + return 0; + vt->audmode = state->audmode; + vt->capability = V4L2_TUNER_CAP_STEREO | + V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2; + vt->rxsubchans = V4L2_TUNER_SUB_MONO; + return 0; +} + +static int vp27smpx_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_VP27SMPX, 0); +} + +static int vp27smpx_log_status(struct v4l2_subdev *sd) +{ + struct vp27smpx_state *state = to_state(sd); + + v4l2_info(sd, "Audio Mode: %u%s\n", state->audmode, + state->radio ? " (Radio)" : ""); + return 0; +} + +/* ----------------------------------------------------------------------- */ + +static const struct v4l2_subdev_core_ops vp27smpx_core_ops = { + .log_status = vp27smpx_log_status, + .g_chip_ident = vp27smpx_g_chip_ident, + .s_std = vp27smpx_s_std, +}; + +static const struct v4l2_subdev_tuner_ops vp27smpx_tuner_ops = { + .s_radio = vp27smpx_s_radio, + .s_tuner = vp27smpx_s_tuner, + .g_tuner = vp27smpx_g_tuner, +}; + +static const struct v4l2_subdev_ops vp27smpx_ops = { + .core = &vp27smpx_core_ops, + .tuner = &vp27smpx_tuner_ops, +}; + +/* ----------------------------------------------------------------------- */ + +/* i2c implementation */ + +/* + * Generic i2c probe + * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' + */ + +static int vp27smpx_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct vp27smpx_state *state; + struct v4l2_subdev *sd; + + /* Check if the adapter supports the needed features */ + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -EIO; + + v4l_info(client, "chip found @ 0x%x (%s)\n", + client->addr << 1, client->adapter->name); + + state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL); + if (state == NULL) + return -ENOMEM; + sd = &state->sd; + v4l2_i2c_subdev_init(sd, client, &vp27smpx_ops); + state->audmode = V4L2_TUNER_MODE_STEREO; + + /* initialize vp27smpx */ + vp27smpx_set_audmode(sd, state->audmode); + return 0; +} + +static int vp27smpx_remove(struct i2c_client *client) +{ + struct v4l2_subdev *sd = i2c_get_clientdata(client); + + v4l2_device_unregister_subdev(sd); + kfree(to_state(sd)); + return 0; +} + +/* ----------------------------------------------------------------------- */ + +static const struct i2c_device_id vp27smpx_id[] = { + { "vp27smpx", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, vp27smpx_id); + +static struct i2c_driver vp27smpx_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "vp27smpx", + }, + .probe = vp27smpx_probe, + .remove = vp27smpx_remove, + .id_table = vp27smpx_id, +}; + +module_i2c_driver(vp27smpx_driver); |