1 files changed, 604 insertions, 0 deletions

diff --git a/drivers/media/radio/wl128x/fmdrv_v4l2.c b/drivers/media/radio/wl128x/fmdrv_v4l2.c
new file mode 100644
index 000000000..1c146d14d
--- /dev/null
+++ b/drivers/media/radio/wl128x/fmdrv_v4l2.c
@@ -0,0 +1,604 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  FM Driver for Connectivity chip of Texas Instruments.
+ *  This file provides interfaces to V4L2 subsystem.
+ *
+ *  This module registers with V4L2 subsystem as Radio
+ *  data system interface (/dev/radio). During the registration,
+ *  it will expose two set of function pointers.
+ *
+ *    1) File operation related API (open, close, read, write, poll...etc).
+ *    2) Set of V4L2 IOCTL complaint API.
+ *
+ *  Copyright (C) 2011 Texas Instruments
+ *  Author: Raja Mani <raja_mani@ti.com>
+ *  Author: Manjunatha Halli <manjunatha_halli@ti.com>
+ */
+
+#include <linux/export.h>
+
+#include "fmdrv.h"
+#include "fmdrv_v4l2.h"
+#include "fmdrv_common.h"
+#include "fmdrv_rx.h"
+#include "fmdrv_tx.h"
+
+static struct video_device gradio_dev;
+static u8 radio_disconnected;
+
+/* -- V4L2 RADIO (/dev/radioX) device file operation interfaces --- */
+
+/* Read RX RDS data */
+static ssize_t fm_v4l2_fops_read(struct file *file, char __user * buf,
+					size_t count, loff_t *ppos)
+{
+	u8 rds_mode;
+	int ret;
+	struct fmdev *fmdev;
+
+	fmdev = video_drvdata(file);
+
+	if (!radio_disconnected) {
+		fmerr("FM device is already disconnected\n");
+		return -EIO;
+	}
+
+	if (mutex_lock_interruptible(&fmdev->mutex))
+		return -ERESTARTSYS;
+
+	/* Turn on RDS mode if it is disabled */
+	ret = fm_rx_get_rds_mode(fmdev, &rds_mode);
+	if (ret < 0) {
+		fmerr("Unable to read current rds mode\n");
+		goto read_unlock;
+	}
+
+	if (rds_mode == FM_RDS_DISABLE) {
+		ret = fmc_set_rds_mode(fmdev, FM_RDS_ENABLE);
+		if (ret < 0) {
+			fmerr("Failed to enable rds mode\n");
+			goto read_unlock;
+		}
+	}
+
+	/* Copy RDS data from internal buffer to user buffer */
+	ret = fmc_transfer_rds_from_internal_buff(fmdev, file, buf, count);
+read_unlock:
+	mutex_unlock(&fmdev->mutex);
+	return ret;
+}
+
+/* Write TX RDS data */
+static ssize_t fm_v4l2_fops_write(struct file *file, const char __user * buf,
+		size_t count, loff_t *ppos)
+{
+	struct tx_rds rds;
+	int ret;
+	struct fmdev *fmdev;
+
+	ret = copy_from_user(&rds, buf, sizeof(rds));
+	rds.text[sizeof(rds.text) - 1] = '\0';
+	fmdbg("(%d)type: %d, text %s, af %d\n",
+		   ret, rds.text_type, rds.text, rds.af_freq);
+	if (ret)
+		return -EFAULT;
+
+	fmdev = video_drvdata(file);
+	if (mutex_lock_interruptible(&fmdev->mutex))
+		return -ERESTARTSYS;
+	fm_tx_set_radio_text(fmdev, rds.text, rds.text_type);
+	fm_tx_set_af(fmdev, rds.af_freq);
+	mutex_unlock(&fmdev->mutex);
+
+	return sizeof(rds);
+}
+
+static __poll_t fm_v4l2_fops_poll(struct file *file, struct poll_table_struct *pts)
+{
+	int ret;
+	struct fmdev *fmdev;
+
+	fmdev = video_drvdata(file);
+	mutex_lock(&fmdev->mutex);
+	ret = fmc_is_rds_data_available(fmdev, file, pts);
+	mutex_unlock(&fmdev->mutex);
+	if (ret < 0)
+		return EPOLLIN | EPOLLRDNORM;
+
+	return 0;
+}
+
+/*
+ * Handle open request for "/dev/radioX" device.
+ * Start with FM RX mode as default.
+ */
+static int fm_v4l2_fops_open(struct file *file)
+{
+	int ret;
+	struct fmdev *fmdev = NULL;
+
+	/* Don't allow multiple open */
+	if (radio_disconnected) {
+		fmerr("FM device is already opened\n");
+		return -EBUSY;
+	}
+
+	fmdev = video_drvdata(file);
+
+	if (mutex_lock_interruptible(&fmdev->mutex))
+		return -ERESTARTSYS;
+	ret = fmc_prepare(fmdev);
+	if (ret < 0) {
+		fmerr("Unable to prepare FM CORE\n");
+		goto open_unlock;
+	}
+
+	fmdbg("Load FM RX firmware..\n");
+
+	ret = fmc_set_mode(fmdev, FM_MODE_RX);
+	if (ret < 0) {
+		fmerr("Unable to load FM RX firmware\n");
+		goto open_unlock;
+	}
+	radio_disconnected = 1;
+
+open_unlock:
+	mutex_unlock(&fmdev->mutex);
+	return ret;
+}
+
+static int fm_v4l2_fops_release(struct file *file)
+{
+	int ret;
+	struct fmdev *fmdev;
+
+	fmdev = video_drvdata(file);
+	if (!radio_disconnected) {
+		fmdbg("FM device is already closed\n");
+		return 0;
+	}
+
+	mutex_lock(&fmdev->mutex);
+	ret = fmc_set_mode(fmdev, FM_MODE_OFF);
+	if (ret < 0) {
+		fmerr("Unable to turn off the chip\n");
+		goto release_unlock;
+	}
+
+	ret = fmc_release(fmdev);
+	if (ret < 0) {
+		fmerr("FM CORE release failed\n");
+		goto release_unlock;
+	}
+	radio_disconnected = 0;
+
+release_unlock:
+	mutex_unlock(&fmdev->mutex);
+	return ret;
+}
+
+/* V4L2 RADIO (/dev/radioX) device IOCTL interfaces */
+static int fm_v4l2_vidioc_querycap(struct file *file, void *priv,
+		struct v4l2_capability *capability)
+{
+	strscpy(capability->driver, FM_DRV_NAME, sizeof(capability->driver));
+	strscpy(capability->card, FM_DRV_CARD_SHORT_NAME,
+		sizeof(capability->card));
+	sprintf(capability->bus_info, "UART");
+	return 0;
+}
+
+static int fm_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct fmdev *fmdev = container_of(ctrl->handler,
+			struct fmdev, ctrl_handler);
+
+	switch (ctrl->id) {
+	case  V4L2_CID_TUNE_ANTENNA_CAPACITOR:
+		ctrl->val = fm_tx_get_tune_cap_val(fmdev);
+		break;
+	default:
+		fmwarn("%s: Unknown IOCTL: %d\n", __func__, ctrl->id);
+		break;
+	}
+
+	return 0;
+}
+
+static int fm_v4l2_s_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct fmdev *fmdev = container_of(ctrl->handler,
+			struct fmdev, ctrl_handler);
+
+	switch (ctrl->id) {
+	case V4L2_CID_AUDIO_VOLUME:	/* set volume */
+		return fm_rx_set_volume(fmdev, (u16)ctrl->val);
+
+	case V4L2_CID_AUDIO_MUTE:	/* set mute */
+		return fmc_set_mute_mode(fmdev, (u8)ctrl->val);
+
+	case V4L2_CID_TUNE_POWER_LEVEL:
+		/* set TX power level - ext control */
+		return fm_tx_set_pwr_lvl(fmdev, (u8)ctrl->val);
+
+	case V4L2_CID_TUNE_PREEMPHASIS:
+		return fm_tx_set_preemph_filter(fmdev, (u8) ctrl->val);
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int fm_v4l2_vidioc_g_audio(struct file *file, void *priv,
+		struct v4l2_audio *audio)
+{
+	memset(audio, 0, sizeof(*audio));
+	strscpy(audio->name, "Radio", sizeof(audio->name));
+	audio->capability = V4L2_AUDCAP_STEREO;
+
+	return 0;
+}
+
+static int fm_v4l2_vidioc_s_audio(struct file *file, void *priv,
+		const struct v4l2_audio *audio)
+{
+	if (audio->index != 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+/* Get tuner attributes. If current mode is NOT RX, return error */
+static int fm_v4l2_vidioc_g_tuner(struct file *file, void *priv,
+		struct v4l2_tuner *tuner)
+{
+	struct fmdev *fmdev = video_drvdata(file);
+	u32 bottom_freq;
+	u32 top_freq;
+	u16 stereo_mono_mode;
+	u16 rssilvl;
+	int ret;
+
+	if (tuner->index != 0)
+		return -EINVAL;
+
+	if (fmdev->curr_fmmode != FM_MODE_RX)
+		return -EPERM;
+
+	ret = fm_rx_get_band_freq_range(fmdev, &bottom_freq, &top_freq);
+	if (ret != 0)
+		return ret;
+
+	ret = fm_rx_get_stereo_mono(fmdev, &stereo_mono_mode);
+	if (ret != 0)
+		return ret;
+
+	ret = fm_rx_get_rssi_level(fmdev, &rssilvl);
+	if (ret != 0)
+		return ret;
+
+	strscpy(tuner->name, "FM", sizeof(tuner->name));
+	tuner->type = V4L2_TUNER_RADIO;
+	/* Store rangelow and rangehigh freq in unit of 62.5 Hz */
+	tuner->rangelow = bottom_freq * 16;
+	tuner->rangehigh = top_freq * 16;
+	tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO |
+	((fmdev->rx.rds.flag == FM_RDS_ENABLE) ? V4L2_TUNER_SUB_RDS : 0);
+	tuner->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
+			    V4L2_TUNER_CAP_LOW |
+			    V4L2_TUNER_CAP_HWSEEK_BOUNDED |
+			    V4L2_TUNER_CAP_HWSEEK_WRAP;
+	tuner->audmode = (stereo_mono_mode ?
+			  V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO);
+
+	/*
+	 * Actual rssi value lies in between -128 to +127.
+	 * Convert this range from 0 to 255 by adding +128
+	 */
+	rssilvl += 128;
+
+	/*
+	 * Return signal strength value should be within 0 to 65535.
+	 * Find out correct signal radio by multiplying (65535/255) = 257
+	 */
+	tuner->signal = rssilvl * 257;
+	tuner->afc = 0;
+
+	return ret;
+}
+
+/*
+ * Set tuner attributes. If current mode is NOT RX, set to RX.
+ * Currently, we set only audio mode (mono/stereo) and RDS state (on/off).
+ * Should we set other tuner attributes, too?
+ */
+static int fm_v4l2_vidioc_s_tuner(struct file *file, void *priv,
+		const struct v4l2_tuner *tuner)
+{
+	struct fmdev *fmdev = video_drvdata(file);
+	u16 aud_mode;
+	u8 rds_mode;
+	int ret;
+
+	if (tuner->index != 0)
+		return -EINVAL;
+
+	aud_mode = (tuner->audmode == V4L2_TUNER_MODE_STEREO) ?
+			FM_STEREO_MODE : FM_MONO_MODE;
+	rds_mode = (tuner->rxsubchans & V4L2_TUNER_SUB_RDS) ?
+			FM_RDS_ENABLE : FM_RDS_DISABLE;
+
+	if (fmdev->curr_fmmode != FM_MODE_RX) {
+		ret = fmc_set_mode(fmdev, FM_MODE_RX);
+		if (ret < 0) {
+			fmerr("Failed to set RX mode\n");
+			return ret;
+		}
+	}
+
+	ret = fmc_set_stereo_mono(fmdev, aud_mode);
+	if (ret < 0) {
+		fmerr("Failed to set RX stereo/mono mode\n");
+		return ret;
+	}
+
+	ret = fmc_set_rds_mode(fmdev, rds_mode);
+	if (ret < 0)
+		fmerr("Failed to set RX RDS mode\n");
+
+	return ret;
+}
+
+/* Get tuner or modulator radio frequency */
+static int fm_v4l2_vidioc_g_freq(struct file *file, void *priv,
+		struct v4l2_frequency *freq)
+{
+	struct fmdev *fmdev = video_drvdata(file);
+	int ret;
+
+	ret = fmc_get_freq(fmdev, &freq->frequency);
+	if (ret < 0) {
+		fmerr("Failed to get frequency\n");
+		return ret;
+	}
+
+	/* Frequency unit of 62.5 Hz*/
+	freq->frequency = (u32) freq->frequency * 16;
+
+	return 0;
+}
+
+/* Set tuner or modulator radio frequency */
+static int fm_v4l2_vidioc_s_freq(struct file *file, void *priv,
+		const struct v4l2_frequency *freq)
+{
+	struct fmdev *fmdev = video_drvdata(file);
+
+	/*
+	 * As V4L2_TUNER_CAP_LOW is set 1 user sends the frequency
+	 * in units of 62.5 Hz.
+	 */
+	return fmc_set_freq(fmdev, freq->frequency / 16);
+}
+
+/* Set hardware frequency seek. If current mode is NOT RX, set it RX. */
+static int fm_v4l2_vidioc_s_hw_freq_seek(struct file *file, void *priv,
+		const struct v4l2_hw_freq_seek *seek)
+{
+	struct fmdev *fmdev = video_drvdata(file);
+	int ret;
+
+	if (file->f_flags & O_NONBLOCK)
+		return -EWOULDBLOCK;
+
+	if (fmdev->curr_fmmode != FM_MODE_RX) {
+		ret = fmc_set_mode(fmdev, FM_MODE_RX);
+		if (ret != 0) {
+			fmerr("Failed to set RX mode\n");
+			return ret;
+		}
+	}
+
+	ret = fm_rx_seek(fmdev, seek->seek_upward, seek->wrap_around,
+			seek->spacing);
+	if (ret < 0)
+		fmerr("RX seek failed - %d\n", ret);
+
+	return ret;
+}
+/* Get modulator attributes. If mode is not TX, return no attributes. */
+static int fm_v4l2_vidioc_g_modulator(struct file *file, void *priv,
+		struct v4l2_modulator *mod)
+{
+	struct fmdev *fmdev = video_drvdata(file);
+
+	if (mod->index != 0)
+		return -EINVAL;
+
+	if (fmdev->curr_fmmode != FM_MODE_TX)
+		return -EPERM;
+
+	mod->txsubchans = ((fmdev->tx_data.aud_mode == FM_STEREO_MODE) ?
+				V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO) |
+				((fmdev->tx_data.rds.flag == FM_RDS_ENABLE) ?
+				V4L2_TUNER_SUB_RDS : 0);
+
+	mod->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
+				V4L2_TUNER_CAP_LOW;
+
+	return 0;
+}
+
+/* Set modulator attributes. If mode is not TX, set to TX. */
+static int fm_v4l2_vidioc_s_modulator(struct file *file, void *priv,
+		const struct v4l2_modulator *mod)
+{
+	struct fmdev *fmdev = video_drvdata(file);
+	u8 rds_mode;
+	u16 aud_mode;
+	int ret;
+
+	if (mod->index != 0)
+		return -EINVAL;
+
+	if (fmdev->curr_fmmode != FM_MODE_TX) {
+		ret = fmc_set_mode(fmdev, FM_MODE_TX);
+		if (ret != 0) {
+			fmerr("Failed to set TX mode\n");
+			return ret;
+		}
+	}
+
+	aud_mode = (mod->txsubchans & V4L2_TUNER_SUB_STEREO) ?
+			FM_STEREO_MODE : FM_MONO_MODE;
+	rds_mode = (mod->txsubchans & V4L2_TUNER_SUB_RDS) ?
+			FM_RDS_ENABLE : FM_RDS_DISABLE;
+	ret = fm_tx_set_stereo_mono(fmdev, aud_mode);
+	if (ret < 0) {
+		fmerr("Failed to set mono/stereo mode for TX\n");
+		return ret;
+	}
+	ret = fm_tx_set_rds_mode(fmdev, rds_mode);
+	if (ret < 0)
+		fmerr("Failed to set rds mode for TX\n");
+
+	return ret;
+}
+
+static const struct v4l2_file_operations fm_drv_fops = {
+	.owner = THIS_MODULE,
+	.read = fm_v4l2_fops_read,
+	.write = fm_v4l2_fops_write,
+	.poll = fm_v4l2_fops_poll,
+	.unlocked_ioctl = video_ioctl2,
+	.open = fm_v4l2_fops_open,
+	.release = fm_v4l2_fops_release,
+};
+
+static const struct v4l2_ctrl_ops fm_ctrl_ops = {
+	.s_ctrl = fm_v4l2_s_ctrl,
+	.g_volatile_ctrl = fm_g_volatile_ctrl,
+};
+static const struct v4l2_ioctl_ops fm_drv_ioctl_ops = {
+	.vidioc_querycap = fm_v4l2_vidioc_querycap,
+	.vidioc_g_audio = fm_v4l2_vidioc_g_audio,
+	.vidioc_s_audio = fm_v4l2_vidioc_s_audio,
+	.vidioc_g_tuner = fm_v4l2_vidioc_g_tuner,
+	.vidioc_s_tuner = fm_v4l2_vidioc_s_tuner,
+	.vidioc_g_frequency = fm_v4l2_vidioc_g_freq,
+	.vidioc_s_frequency = fm_v4l2_vidioc_s_freq,
+	.vidioc_s_hw_freq_seek = fm_v4l2_vidioc_s_hw_freq_seek,
+	.vidioc_g_modulator = fm_v4l2_vidioc_g_modulator,
+	.vidioc_s_modulator = fm_v4l2_vidioc_s_modulator
+};
+
+/* V4L2 RADIO device parent structure */
+static const struct video_device fm_viddev_template = {
+	.fops = &fm_drv_fops,
+	.ioctl_ops = &fm_drv_ioctl_ops,
+	.name = FM_DRV_NAME,
+	.release = video_device_release_empty,
+	/*
+	 * To ensure both the tuner and modulator ioctls are accessible we
+	 * set the vfl_dir to M2M to indicate this.
+	 *
+	 * It is not really a mem2mem device of course, but it can both receive
+	 * and transmit using the same radio device. It's the only radio driver
+	 * that does this and it should really be split in two radio devices,
+	 * but that would affect applications using this driver.
+	 */
+	.vfl_dir = VFL_DIR_M2M,
+	.device_caps = V4L2_CAP_HW_FREQ_SEEK | V4L2_CAP_TUNER | V4L2_CAP_RADIO |
+		       V4L2_CAP_MODULATOR | V4L2_CAP_AUDIO |
+		       V4L2_CAP_READWRITE | V4L2_CAP_RDS_CAPTURE,
+};
+
+int fm_v4l2_init_video_device(struct fmdev *fmdev, int radio_nr)
+{
+	struct v4l2_ctrl *ctrl;
+	int ret;
+
+	strscpy(fmdev->v4l2_dev.name, FM_DRV_NAME,
+		sizeof(fmdev->v4l2_dev.name));
+	ret = v4l2_device_register(NULL, &fmdev->v4l2_dev);
+	if (ret < 0)
+		return ret;
+
+	/* Init mutex for core locking */
+	mutex_init(&fmdev->mutex);
+
+	/* Setup FM driver's V4L2 properties */
+	gradio_dev = fm_viddev_template;
+
+	video_set_drvdata(&gradio_dev, fmdev);
+
+	gradio_dev.lock = &fmdev->mutex;
+	gradio_dev.v4l2_dev = &fmdev->v4l2_dev;
+
+	/* Register with V4L2 subsystem as RADIO device */
+	if (video_register_device(&gradio_dev, VFL_TYPE_RADIO, radio_nr)) {
+		v4l2_device_unregister(&fmdev->v4l2_dev);
+		fmerr("Could not register video device\n");
+		return -ENOMEM;
+	}
+
+	fmdev->radio_dev = &gradio_dev;
+
+	/* Register to v4l2 ctrl handler framework */
+	fmdev->radio_dev->ctrl_handler = &fmdev->ctrl_handler;
+
+	ret = v4l2_ctrl_handler_init(&fmdev->ctrl_handler, 5);
+	if (ret < 0) {
+		fmerr("(fmdev): Can't init ctrl handler\n");
+		v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
+		video_unregister_device(fmdev->radio_dev);
+		v4l2_device_unregister(&fmdev->v4l2_dev);
+		return -EBUSY;
+	}
+
+	/*
+	 * Following controls are handled by V4L2 control framework.
+	 * Added in ascending ID order.
+	 */
+	v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
+			V4L2_CID_AUDIO_VOLUME, FM_RX_VOLUME_MIN,
+			FM_RX_VOLUME_MAX, 1, FM_RX_VOLUME_MAX);
+
+	v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
+			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
+
+	v4l2_ctrl_new_std_menu(&fmdev->ctrl_handler, &fm_ctrl_ops,
+			V4L2_CID_TUNE_PREEMPHASIS, V4L2_PREEMPHASIS_75_uS,
+			0, V4L2_PREEMPHASIS_75_uS);
+
+	v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
+			V4L2_CID_TUNE_POWER_LEVEL, FM_PWR_LVL_LOW,
+			FM_PWR_LVL_HIGH, 1, FM_PWR_LVL_HIGH);
+
+	ctrl = v4l2_ctrl_new_std(&fmdev->ctrl_handler, &fm_ctrl_ops,
+			V4L2_CID_TUNE_ANTENNA_CAPACITOR, 0,
+			255, 1, 255);
+
+	if (ctrl)
+		ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
+
+	return 0;
+}
+
+void *fm_v4l2_deinit_video_device(void)
+{
+	struct fmdev *fmdev;
+
+
+	fmdev = video_get_drvdata(&gradio_dev);
+
+	/* Unregister to v4l2 ctrl handler framework*/
+	v4l2_ctrl_handler_free(&fmdev->ctrl_handler);
+
+	/* Unregister RADIO device from V4L2 subsystem */
+	video_unregister_device(&gradio_dev);
+
+	v4l2_device_unregister(&fmdev->v4l2_dev);
+
+	return fmdev;
+}