diff options
Diffstat (limited to 'drivers/media/radio/radio-si4713.c')
| -rw-r--r-- | drivers/media/radio/radio-si4713.c | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-si4713.c b/drivers/media/radio/radio-si4713.c new file mode 100644 index 00000000..c54210c7 --- /dev/null +++ b/drivers/media/radio/radio-si4713.c @@ -0,0 +1,358 @@ +/* + * drivers/media/radio/radio-si4713.c + * + * Platform Driver for Silicon Labs Si4713 FM Radio Transmitter: + * + * Copyright (c) 2008 Instituto Nokia de Tecnologia - INdT + * Contact: Eduardo Valentin <eduardo.valentin@nokia.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; 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/i2c.h> +#include <linux/videodev2.h> +#include <linux/slab.h> +#include <media/v4l2-device.h> +#include <media/v4l2-common.h> +#include <media/v4l2-ioctl.h> +#include <media/radio-si4713.h> + +/* module parameters */ +static int radio_nr = -1; /* radio device minor (-1 ==> auto assign) */ +module_param(radio_nr, int, 0); +MODULE_PARM_DESC(radio_nr, + "Minor number for radio device (-1 ==> auto assign)"); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Eduardo Valentin <eduardo.valentin@nokia.com>"); +MODULE_DESCRIPTION("Platform driver for Si4713 FM Radio Transmitter"); +MODULE_VERSION("0.0.1"); + +/* Driver state struct */ +struct radio_si4713_device { + struct v4l2_device v4l2_dev; + struct video_device *radio_dev; +}; + +/* radio_si4713_fops - file operations interface */ +static const struct v4l2_file_operations radio_si4713_fops = { + .owner = THIS_MODULE, + /* Note: locking is done at the subdev level in the i2c driver. */ + .unlocked_ioctl = video_ioctl2, +}; + +/* Video4Linux Interface */ +static int radio_si4713_fill_audout(struct v4l2_audioout *vao) +{ + /* TODO: check presence of audio output */ + strlcpy(vao->name, "FM Modulator Audio Out", 32); + + return 0; +} + +static int radio_si4713_enumaudout(struct file *file, void *priv, + struct v4l2_audioout *vao) +{ + return radio_si4713_fill_audout(vao); +} + +static int radio_si4713_g_audout(struct file *file, void *priv, + struct v4l2_audioout *vao) +{ + int rval = radio_si4713_fill_audout(vao); + + vao->index = 0; + + return rval; +} + +static int radio_si4713_s_audout(struct file *file, void *priv, + struct v4l2_audioout *vao) +{ + return vao->index ? -EINVAL : 0; +} + +/* radio_si4713_querycap - query device capabilities */ +static int radio_si4713_querycap(struct file *file, void *priv, + struct v4l2_capability *capability) +{ + strlcpy(capability->driver, "radio-si4713", sizeof(capability->driver)); + strlcpy(capability->card, "Silicon Labs Si4713 Modulator", + sizeof(capability->card)); + capability->capabilities = V4L2_CAP_MODULATOR | V4L2_CAP_RDS_OUTPUT; + + return 0; +} + +/* radio_si4713_queryctrl - enumerate control items */ +static int radio_si4713_queryctrl(struct file *file, void *priv, + struct v4l2_queryctrl *qc) +{ + /* Must be sorted from low to high control ID! */ + static const u32 user_ctrls[] = { + V4L2_CID_USER_CLASS, + V4L2_CID_AUDIO_MUTE, + 0 + }; + + /* Must be sorted from low to high control ID! */ + static const u32 fmtx_ctrls[] = { + V4L2_CID_FM_TX_CLASS, + V4L2_CID_RDS_TX_DEVIATION, + V4L2_CID_RDS_TX_PI, + V4L2_CID_RDS_TX_PTY, + V4L2_CID_RDS_TX_PS_NAME, + V4L2_CID_RDS_TX_RADIO_TEXT, + V4L2_CID_AUDIO_LIMITER_ENABLED, + V4L2_CID_AUDIO_LIMITER_RELEASE_TIME, + V4L2_CID_AUDIO_LIMITER_DEVIATION, + V4L2_CID_AUDIO_COMPRESSION_ENABLED, + V4L2_CID_AUDIO_COMPRESSION_GAIN, + V4L2_CID_AUDIO_COMPRESSION_THRESHOLD, + V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME, + V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME, + V4L2_CID_PILOT_TONE_ENABLED, + V4L2_CID_PILOT_TONE_DEVIATION, + V4L2_CID_PILOT_TONE_FREQUENCY, + V4L2_CID_TUNE_PREEMPHASIS, + V4L2_CID_TUNE_POWER_LEVEL, + V4L2_CID_TUNE_ANTENNA_CAPACITOR, + 0 + }; + static const u32 *ctrl_classes[] = { + user_ctrls, + fmtx_ctrls, + NULL + }; + struct radio_si4713_device *rsdev; + + rsdev = video_get_drvdata(video_devdata(file)); + + qc->id = v4l2_ctrl_next(ctrl_classes, qc->id); + if (qc->id == 0) + return -EINVAL; + + if (qc->id == V4L2_CID_USER_CLASS || qc->id == V4L2_CID_FM_TX_CLASS) + return v4l2_ctrl_query_fill(qc, 0, 0, 0, 0); + + return v4l2_device_call_until_err(&rsdev->v4l2_dev, 0, core, + queryctrl, qc); +} + +/* + * v4l2 ioctl call backs. + * we are just a wrapper for v4l2_sub_devs. + */ +static inline struct v4l2_device *get_v4l2_dev(struct file *file) +{ + return &((struct radio_si4713_device *)video_drvdata(file))->v4l2_dev; +} + +static int radio_si4713_g_ext_ctrls(struct file *file, void *p, + struct v4l2_ext_controls *vecs) +{ + return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core, + g_ext_ctrls, vecs); +} + +static int radio_si4713_s_ext_ctrls(struct file *file, void *p, + struct v4l2_ext_controls *vecs) +{ + return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core, + s_ext_ctrls, vecs); +} + +static int radio_si4713_g_ctrl(struct file *file, void *p, + struct v4l2_control *vc) +{ + return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core, + g_ctrl, vc); +} + +static int radio_si4713_s_ctrl(struct file *file, void *p, + struct v4l2_control *vc) +{ + return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core, + s_ctrl, vc); +} + +static int radio_si4713_g_modulator(struct file *file, void *p, + struct v4l2_modulator *vm) +{ + return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner, + g_modulator, vm); +} + +static int radio_si4713_s_modulator(struct file *file, void *p, + struct v4l2_modulator *vm) +{ + return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner, + s_modulator, vm); +} + +static int radio_si4713_g_frequency(struct file *file, void *p, + struct v4l2_frequency *vf) +{ + return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner, + g_frequency, vf); +} + +static int radio_si4713_s_frequency(struct file *file, void *p, + struct v4l2_frequency *vf) +{ + return v4l2_device_call_until_err(get_v4l2_dev(file), 0, tuner, + s_frequency, vf); +} + +static long radio_si4713_default(struct file *file, void *p, + bool valid_prio, int cmd, void *arg) +{ + return v4l2_device_call_until_err(get_v4l2_dev(file), 0, core, + ioctl, cmd, arg); +} + +static struct v4l2_ioctl_ops radio_si4713_ioctl_ops = { + .vidioc_enumaudout = radio_si4713_enumaudout, + .vidioc_g_audout = radio_si4713_g_audout, + .vidioc_s_audout = radio_si4713_s_audout, + .vidioc_querycap = radio_si4713_querycap, + .vidioc_queryctrl = radio_si4713_queryctrl, + .vidioc_g_ext_ctrls = radio_si4713_g_ext_ctrls, + .vidioc_s_ext_ctrls = radio_si4713_s_ext_ctrls, + .vidioc_g_ctrl = radio_si4713_g_ctrl, + .vidioc_s_ctrl = radio_si4713_s_ctrl, + .vidioc_g_modulator = radio_si4713_g_modulator, + .vidioc_s_modulator = radio_si4713_s_modulator, + .vidioc_g_frequency = radio_si4713_g_frequency, + .vidioc_s_frequency = radio_si4713_s_frequency, + .vidioc_default = radio_si4713_default, +}; + +/* radio_si4713_vdev_template - video device interface */ +static struct video_device radio_si4713_vdev_template = { + .fops = &radio_si4713_fops, + .name = "radio-si4713", + .release = video_device_release, + .ioctl_ops = &radio_si4713_ioctl_ops, +}; + +/* Platform driver interface */ +/* radio_si4713_pdriver_probe - probe for the device */ +static int radio_si4713_pdriver_probe(struct platform_device *pdev) +{ + struct radio_si4713_platform_data *pdata = pdev->dev.platform_data; + struct radio_si4713_device *rsdev; + struct i2c_adapter *adapter; + struct v4l2_subdev *sd; + int rval = 0; + + if (!pdata) { + dev_err(&pdev->dev, "Cannot proceed without platform data.\n"); + rval = -EINVAL; + goto exit; + } + + rsdev = kzalloc(sizeof *rsdev, GFP_KERNEL); + if (!rsdev) { + dev_err(&pdev->dev, "Failed to alloc video device.\n"); + rval = -ENOMEM; + goto exit; + } + + rval = v4l2_device_register(&pdev->dev, &rsdev->v4l2_dev); + if (rval) { + dev_err(&pdev->dev, "Failed to register v4l2 device.\n"); + goto free_rsdev; + } + + adapter = i2c_get_adapter(pdata->i2c_bus); + if (!adapter) { + dev_err(&pdev->dev, "Cannot get i2c adapter %d\n", + pdata->i2c_bus); + rval = -ENODEV; + goto unregister_v4l2_dev; + } + + sd = v4l2_i2c_new_subdev_board(&rsdev->v4l2_dev, adapter, + pdata->subdev_board_info, NULL); + if (!sd) { + dev_err(&pdev->dev, "Cannot get v4l2 subdevice\n"); + rval = -ENODEV; + goto put_adapter; + } + + rsdev->radio_dev = video_device_alloc(); + if (!rsdev->radio_dev) { + dev_err(&pdev->dev, "Failed to alloc video device.\n"); + rval = -ENOMEM; + goto put_adapter; + } + + memcpy(rsdev->radio_dev, &radio_si4713_vdev_template, + sizeof(radio_si4713_vdev_template)); + video_set_drvdata(rsdev->radio_dev, rsdev); + if (video_register_device(rsdev->radio_dev, VFL_TYPE_RADIO, radio_nr)) { + dev_err(&pdev->dev, "Could not register video device.\n"); + rval = -EIO; + goto free_vdev; + } + dev_info(&pdev->dev, "New device successfully probed\n"); + + goto exit; + +free_vdev: + video_device_release(rsdev->radio_dev); +put_adapter: + i2c_put_adapter(adapter); +unregister_v4l2_dev: + v4l2_device_unregister(&rsdev->v4l2_dev); +free_rsdev: + kfree(rsdev); +exit: + return rval; +} + +/* radio_si4713_pdriver_remove - remove the device */ +static int __exit radio_si4713_pdriver_remove(struct platform_device *pdev) +{ + struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev); + struct radio_si4713_device *rsdev = container_of(v4l2_dev, + struct radio_si4713_device, + v4l2_dev); + struct v4l2_subdev *sd = list_entry(v4l2_dev->subdevs.next, + struct v4l2_subdev, list); + struct i2c_client *client = v4l2_get_subdevdata(sd); + + video_unregister_device(rsdev->radio_dev); + i2c_put_adapter(client->adapter); + v4l2_device_unregister(&rsdev->v4l2_dev); + kfree(rsdev); + + return 0; +} + +static struct platform_driver radio_si4713_pdriver = { + .driver = { + .name = "radio-si4713", + }, + .probe = radio_si4713_pdriver_probe, + .remove = __exit_p(radio_si4713_pdriver_remove), +}; + +module_platform_driver(radio_si4713_pdriver); |