[deliverable/linux.git] / drivers / media / platform / vivid / vivid-sdr-cap.c

/*
 * vivid-sdr-cap.c - software defined radio support functions.
 *
 * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/math64.h>
#include <linux/videodev2.h>
#include <linux/v4l2-dv-timings.h>
#include <media/v4l2-common.h>
#include <media/v4l2-event.h>
#include <media/v4l2-dv-timings.h>
#include <linux/fixp-arith.h>

#include "vivid-core.h"
#include "vivid-ctrls.h"
#include "vivid-sdr-cap.h"

/* stream formats */
struct vivid_format {
	u32	pixelformat;
	u32	buffersize;
};

/* format descriptions for capture and preview */
static const struct vivid_format formats[] = {
	{
		.pixelformat	= V4L2_SDR_FMT_CU8,
		.buffersize	= SDR_CAP_SAMPLES_PER_BUF * 2,
	}, {
		.pixelformat	= V4L2_SDR_FMT_CS8,
		.buffersize	= SDR_CAP_SAMPLES_PER_BUF * 2,
	},
};

static const struct v4l2_frequency_band bands_adc[] = {
	{
		.tuner = 0,
		.type = V4L2_TUNER_ADC,
		.index = 0,
		.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
		.rangelow   =  300000,
		.rangehigh  =  300000,
	},
	{
		.tuner = 0,
		.type = V4L2_TUNER_ADC,
		.index = 1,
		.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
		.rangelow   =  900001,
		.rangehigh  = 2800000,
	},
	{
		.tuner = 0,
		.type = V4L2_TUNER_ADC,
		.index = 2,
		.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
		.rangelow   = 3200000,
		.rangehigh  = 3200000,
	},
};

/* ADC band midpoints */
#define BAND_ADC_0 ((bands_adc[0].rangehigh + bands_adc[1].rangelow) / 2)
#define BAND_ADC_1 ((bands_adc[1].rangehigh + bands_adc[2].rangelow) / 2)

static const struct v4l2_frequency_band bands_fm[] = {
	{
		.tuner = 1,
		.type = V4L2_TUNER_RF,
		.index = 0,
		.capability = V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS,
		.rangelow   =    50000000,
		.rangehigh  =  2000000000,
	},
};

static void vivid_thread_sdr_cap_tick(struct vivid_dev *dev)
{
	struct vivid_buffer *sdr_cap_buf = NULL;

	dprintk(dev, 1, "SDR Capture Thread Tick\n");

	/* Drop a certain percentage of buffers. */
	if (dev->perc_dropped_buffers &&
	    prandom_u32_max(100) < dev->perc_dropped_buffers)
		return;

	spin_lock(&dev->slock);
	if (!list_empty(&dev->sdr_cap_active)) {
		sdr_cap_buf = list_entry(dev->sdr_cap_active.next,
					 struct vivid_buffer, list);
		list_del(&sdr_cap_buf->list);
	}
	spin_unlock(&dev->slock);

	if (sdr_cap_buf) {
		sdr_cap_buf->vb.sequence = dev->sdr_cap_seq_count;
		vivid_sdr_cap_process(dev, sdr_cap_buf);
		sdr_cap_buf->vb.vb2_buf.timestamp =
			ktime_get_ns() + dev->time_wrap_offset;
		vb2_buffer_done(&sdr_cap_buf->vb.vb2_buf, dev->dqbuf_error ?
				VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
		dev->dqbuf_error = false;
	}
}

static int vivid_thread_sdr_cap(void *data)
{
	struct vivid_dev *dev = data;
	u64 samples_since_start;
	u64 buffers_since_start;
	u64 next_jiffies_since_start;
	unsigned long jiffies_since_start;
	unsigned long cur_jiffies;
	unsigned wait_jiffies;

	dprintk(dev, 1, "SDR Capture Thread Start\n");

	set_freezable();

	/* Resets frame counters */
	dev->sdr_cap_seq_offset = 0;
	if (dev->seq_wrap)
		dev->sdr_cap_seq_offset = 0xffffff80U;
	dev->jiffies_sdr_cap = jiffies;
	dev->sdr_cap_seq_resync = false;

	for (;;) {
		try_to_freeze();
		if (kthread_should_stop())
			break;

		mutex_lock(&dev->mutex);
		cur_jiffies = jiffies;
		if (dev->sdr_cap_seq_resync) {
			dev->jiffies_sdr_cap = cur_jiffies;
			dev->sdr_cap_seq_offset = dev->sdr_cap_seq_count + 1;
			dev->sdr_cap_seq_count = 0;
			dev->sdr_cap_seq_resync = false;
		}
		/* Calculate the number of jiffies since we started streaming */
		jiffies_since_start = cur_jiffies - dev->jiffies_sdr_cap;
		/* Get the number of buffers streamed since the start */
		buffers_since_start =
			(u64)jiffies_since_start * dev->sdr_adc_freq +
				      (HZ * SDR_CAP_SAMPLES_PER_BUF) / 2;
		do_div(buffers_since_start, HZ * SDR_CAP_SAMPLES_PER_BUF);

		/*
		 * After more than 0xf0000000 (rounded down to a multiple of
		 * 'jiffies-per-day' to ease jiffies_to_msecs calculation)
		 * jiffies have passed since we started streaming reset the
		 * counters and keep track of the sequence offset.
		 */
		if (jiffies_since_start > JIFFIES_RESYNC) {
			dev->jiffies_sdr_cap = cur_jiffies;
			dev->sdr_cap_seq_offset = buffers_since_start;
			buffers_since_start = 0;
		}
		dev->sdr_cap_seq_count =
			buffers_since_start + dev->sdr_cap_seq_offset;

		vivid_thread_sdr_cap_tick(dev);
		mutex_unlock(&dev->mutex);

		/*
		 * Calculate the number of samples streamed since we started,
		 * not including the current buffer.
		 */
		samples_since_start = buffers_since_start * SDR_CAP_SAMPLES_PER_BUF;

		/* And the number of jiffies since we started */
		jiffies_since_start = jiffies - dev->jiffies_sdr_cap;

		/* Increase by the number of samples in one buffer */
		samples_since_start += SDR_CAP_SAMPLES_PER_BUF;
		/*
		 * Calculate when that next buffer is supposed to start
		 * in jiffies since we started streaming.
		 */
		next_jiffies_since_start = samples_since_start * HZ +
					   dev->sdr_adc_freq / 2;
		do_div(next_jiffies_since_start, dev->sdr_adc_freq);
		/* If it is in the past, then just schedule asap */
		if (next_jiffies_since_start < jiffies_since_start)
			next_jiffies_since_start = jiffies_since_start;

		wait_jiffies = next_jiffies_since_start - jiffies_since_start;
		schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
	}
	dprintk(dev, 1, "SDR Capture Thread End\n");
	return 0;
}

static int sdr_cap_queue_setup(struct vb2_queue *vq,
		       unsigned *nbuffers, unsigned *nplanes,
		       unsigned sizes[], struct device *alloc_devs[])
{
	/* 2 = max 16-bit sample returned */
	sizes[0] = SDR_CAP_SAMPLES_PER_BUF * 2;
	*nplanes = 1;
	return 0;
}

static int sdr_cap_buf_prepare(struct vb2_buffer *vb)
{
	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
	unsigned size = SDR_CAP_SAMPLES_PER_BUF * 2;

	dprintk(dev, 1, "%s\n", __func__);

	if (dev->buf_prepare_error) {
		/*
		 * Error injection: test what happens if buf_prepare() returns
		 * an error.
		 */
		dev->buf_prepare_error = false;
		return -EINVAL;
	}
	if (vb2_plane_size(vb, 0) < size) {
		dprintk(dev, 1, "%s data will not fit into plane (%lu < %u)\n",
				__func__, vb2_plane_size(vb, 0), size);
		return -EINVAL;
	}
	vb2_set_plane_payload(vb, 0, size);

	return 0;
}

static void sdr_cap_buf_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
	struct vivid_buffer *buf = container_of(vbuf, struct vivid_buffer, vb);

	dprintk(dev, 1, "%s\n", __func__);

	spin_lock(&dev->slock);
	list_add_tail(&buf->list, &dev->sdr_cap_active);
	spin_unlock(&dev->slock);
}

static int sdr_cap_start_streaming(struct vb2_queue *vq, unsigned count)
{
	struct vivid_dev *dev = vb2_get_drv_priv(vq);
	int err = 0;

	dprintk(dev, 1, "%s\n", __func__);
	dev->sdr_cap_seq_count = 0;
	if (dev->start_streaming_error) {
		dev->start_streaming_error = false;
		err = -EINVAL;
	} else if (dev->kthread_sdr_cap == NULL) {
		dev->kthread_sdr_cap = kthread_run(vivid_thread_sdr_cap, dev,
				"%s-sdr-cap", dev->v4l2_dev.name);

		if (IS_ERR(dev->kthread_sdr_cap)) {
			v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
			err = PTR_ERR(dev->kthread_sdr_cap);
			dev->kthread_sdr_cap = NULL;
		}
	}
	if (err) {
		struct vivid_buffer *buf, *tmp;

		list_for_each_entry_safe(buf, tmp, &dev->sdr_cap_active, list) {
			list_del(&buf->list);
			vb2_buffer_done(&buf->vb.vb2_buf,
					VB2_BUF_STATE_QUEUED);
		}
	}
	return err;
}

/* abort streaming and wait for last buffer */
static void sdr_cap_stop_streaming(struct vb2_queue *vq)
{
	struct vivid_dev *dev = vb2_get_drv_priv(vq);

	if (dev->kthread_sdr_cap == NULL)
		return;

	while (!list_empty(&dev->sdr_cap_active)) {
		struct vivid_buffer *buf;

		buf = list_entry(dev->sdr_cap_active.next,
				struct vivid_buffer, list);
		list_del(&buf->list);
		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
	}

	/* shutdown control thread */
	mutex_unlock(&dev->mutex);
	kthread_stop(dev->kthread_sdr_cap);
	dev->kthread_sdr_cap = NULL;
	mutex_lock(&dev->mutex);
}

const struct vb2_ops vivid_sdr_cap_qops = {
	.queue_setup		= sdr_cap_queue_setup,
	.buf_prepare		= sdr_cap_buf_prepare,
	.buf_queue		= sdr_cap_buf_queue,
	.start_streaming	= sdr_cap_start_streaming,
	.stop_streaming		= sdr_cap_stop_streaming,
	.wait_prepare		= vb2_ops_wait_prepare,
	.wait_finish		= vb2_ops_wait_finish,
};

int vivid_sdr_enum_freq_bands(struct file *file, void *fh,
		struct v4l2_frequency_band *band)
{
	switch (band->tuner) {
	case 0:
		if (band->index >= ARRAY_SIZE(bands_adc))
			return -EINVAL;
		*band = bands_adc[band->index];
		return 0;
	case 1:
		if (band->index >= ARRAY_SIZE(bands_fm))
			return -EINVAL;
		*band = bands_fm[band->index];
		return 0;
	default:
		return -EINVAL;
	}
}

int vivid_sdr_g_frequency(struct file *file, void *fh,
		struct v4l2_frequency *vf)
{
	struct vivid_dev *dev = video_drvdata(file);

	switch (vf->tuner) {
	case 0:
		vf->frequency = dev->sdr_adc_freq;
		vf->type = V4L2_TUNER_ADC;
		return 0;
	case 1:
		vf->frequency = dev->sdr_fm_freq;
		vf->type = V4L2_TUNER_RF;
		return 0;
	default:
		return -EINVAL;
	}
}

int vivid_sdr_s_frequency(struct file *file, void *fh,
		const struct v4l2_frequency *vf)
{
	struct vivid_dev *dev = video_drvdata(file);
	unsigned freq = vf->frequency;
	unsigned band;

	switch (vf->tuner) {
	case 0:
		if (vf->type != V4L2_TUNER_ADC)
			return -EINVAL;
		if (freq < BAND_ADC_0)
			band = 0;
		else if (freq < BAND_ADC_1)
			band = 1;
		else
			band = 2;

		freq = clamp_t(unsigned, freq,
				bands_adc[band].rangelow,
				bands_adc[band].rangehigh);

		if (vb2_is_streaming(&dev->vb_sdr_cap_q) &&
		    freq != dev->sdr_adc_freq) {
			/* resync the thread's timings */
			dev->sdr_cap_seq_resync = true;
		}
		dev->sdr_adc_freq = freq;
		return 0;
	case 1:
		if (vf->type != V4L2_TUNER_RF)
			return -EINVAL;
		dev->sdr_fm_freq = clamp_t(unsigned, freq,
				bands_fm[0].rangelow,
				bands_fm[0].rangehigh);
		return 0;
	default:
		return -EINVAL;
	}
}

int vivid_sdr_g_tuner(struct file *file, void *fh, struct v4l2_tuner *vt)
{
	switch (vt->index) {
	case 0:
		strlcpy(vt->name, "ADC", sizeof(vt->name));
		vt->type = V4L2_TUNER_ADC;
		vt->capability =
			V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS;
		vt->rangelow = bands_adc[0].rangelow;
		vt->rangehigh = bands_adc[2].rangehigh;
		return 0;
	case 1:
		strlcpy(vt->name, "RF", sizeof(vt->name));
		vt->type = V4L2_TUNER_RF;
		vt->capability =
			V4L2_TUNER_CAP_1HZ | V4L2_TUNER_CAP_FREQ_BANDS;
		vt->rangelow = bands_fm[0].rangelow;
		vt->rangehigh = bands_fm[0].rangehigh;
		return 0;
	default:
		return -EINVAL;
	}
}

int vivid_sdr_s_tuner(struct file *file, void *fh, const struct v4l2_tuner *vt)
{
	if (vt->index > 1)
		return -EINVAL;
	return 0;
}

int vidioc_enum_fmt_sdr_cap(struct file *file, void *fh, struct v4l2_fmtdesc *f)
{
	if (f->index >= ARRAY_SIZE(formats))
		return -EINVAL;
	f->pixelformat = formats[f->index].pixelformat;
	return 0;
}

int vidioc_g_fmt_sdr_cap(struct file *file, void *fh, struct v4l2_format *f)
{
	struct vivid_dev *dev = video_drvdata(file);

	f->fmt.sdr.pixelformat = dev->sdr_pixelformat;
	f->fmt.sdr.buffersize = dev->sdr_buffersize;
	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
	return 0;
}

int vidioc_s_fmt_sdr_cap(struct file *file, void *fh, struct v4l2_format *f)
{
	struct vivid_dev *dev = video_drvdata(file);
	struct vb2_queue *q = &dev->vb_sdr_cap_q;
	int i;

	if (vb2_is_busy(q))
		return -EBUSY;

	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
	for (i = 0; i < ARRAY_SIZE(formats); i++) {
		if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
			dev->sdr_pixelformat = formats[i].pixelformat;
			dev->sdr_buffersize = formats[i].buffersize;
			f->fmt.sdr.buffersize = formats[i].buffersize;
			return 0;
		}
	}
	dev->sdr_pixelformat = formats[0].pixelformat;
	dev->sdr_buffersize = formats[0].buffersize;
	f->fmt.sdr.pixelformat = formats[0].pixelformat;
	f->fmt.sdr.buffersize = formats[0].buffersize;
	return 0;
}

int vidioc_try_fmt_sdr_cap(struct file *file, void *fh, struct v4l2_format *f)
{
	int i;

	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
	for (i = 0; i < ARRAY_SIZE(formats); i++) {
		if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
			f->fmt.sdr.buffersize = formats[i].buffersize;
			return 0;
		}
	}
	f->fmt.sdr.pixelformat = formats[0].pixelformat;
	f->fmt.sdr.buffersize = formats[0].buffersize;
	return 0;
}

#define FIXP_N    (15)
#define FIXP_FRAC (1 << FIXP_N)
#define FIXP_2PI  ((int)(2 * 3.141592653589 * FIXP_FRAC))
#define M_100000PI (3.14159 * 100000)

void vivid_sdr_cap_process(struct vivid_dev *dev, struct vivid_buffer *buf)
{
	u8 *vbuf = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
	unsigned long i;
	unsigned long plane_size = vb2_plane_size(&buf->vb.vb2_buf, 0);
	s64 s64tmp;
	s32 src_phase_step;
	s32 mod_phase_step;
	s32 fixp_i;
	s32 fixp_q;

	/* calculate phase step */
	#define BEEP_FREQ 1000 /* 1kHz beep */
	src_phase_step = DIV_ROUND_CLOSEST(FIXP_2PI * BEEP_FREQ,
					   dev->sdr_adc_freq);

	for (i = 0; i < plane_size; i += 2) {
		mod_phase_step = fixp_cos32_rad(dev->sdr_fixp_src_phase,
						FIXP_2PI) >> (31 - FIXP_N);

		dev->sdr_fixp_src_phase += src_phase_step;
		s64tmp = (s64) mod_phase_step * dev->sdr_fm_deviation;
		dev->sdr_fixp_mod_phase += div_s64(s64tmp, M_100000PI);

		/*
		 * Transfer phase angle to [0, 2xPI] in order to avoid variable
		 * overflow and make it suitable for cosine implementation
		 * used, which does not support negative angles.
		 */
		dev->sdr_fixp_src_phase %= FIXP_2PI;
		dev->sdr_fixp_mod_phase %= FIXP_2PI;

		if (dev->sdr_fixp_mod_phase < 0)
			dev->sdr_fixp_mod_phase += FIXP_2PI;

		fixp_i = fixp_cos32_rad(dev->sdr_fixp_mod_phase, FIXP_2PI);
		fixp_q = fixp_sin32_rad(dev->sdr_fixp_mod_phase, FIXP_2PI);

		/* Normalize fraction values represented with 32 bit precision
		 * to fixed point representation with FIXP_N bits */
		fixp_i >>= (31 - FIXP_N);
		fixp_q >>= (31 - FIXP_N);

		switch (dev->sdr_pixelformat) {
		case V4L2_SDR_FMT_CU8:
			/* convert 'fixp float' to u8 [0, +255] */
			/* u8 = X * 127.5 + 127.5; X is float [-1.0, +1.0] */
			fixp_i = fixp_i * 1275 + FIXP_FRAC * 1275;
			fixp_q = fixp_q * 1275 + FIXP_FRAC * 1275;
			*vbuf++ = DIV_ROUND_CLOSEST(fixp_i, FIXP_FRAC * 10);
			*vbuf++ = DIV_ROUND_CLOSEST(fixp_q, FIXP_FRAC * 10);
			break;
		case V4L2_SDR_FMT_CS8:
			/* convert 'fixp float' to s8 [-128, +127] */
			/* s8 = X * 127.5 - 0.5; X is float [-1.0, +1.0] */
			fixp_i = fixp_i * 1275 - FIXP_FRAC * 5;
			fixp_q = fixp_q * 1275 - FIXP_FRAC * 5;
			*vbuf++ = DIV_ROUND_CLOSEST(fixp_i, FIXP_FRAC * 10);
			*vbuf++ = DIV_ROUND_CLOSEST(fixp_q, FIXP_FRAC * 10);
			break;
		default:
			break;
		}
	}
}
Commit	Line	Data
6de8653f HV	1	/*
	2	* vivid-sdr-cap.c - software defined radio support functions.
	3	*
	4	* Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
	5	*
	6	* This program is free software; you may redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; version 2 of the License.
	9	*
	10	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	11	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	12	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	13	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	14	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	15	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	16	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	17	* SOFTWARE.
	18	*/
	19
	20	#include <linux/errno.h>
	21	#include <linux/kernel.h>
	22	#include <linux/delay.h>
	23	#include <linux/kthread.h>
	24	#include <linux/freezer.h>
f335c3f2	25	#include <linux/math64.h>
6de8653f HV	26	#include <linux/videodev2.h>
	27	#include <linux/v4l2-dv-timings.h>
	28	#include <media/v4l2-common.h>
	29	#include <media/v4l2-event.h>
	30	#include <media/v4l2-dv-timings.h>
4e30a373	31	#include <linux/fixp-arith.h>
6de8653f HV	32
	33	#include "vivid-core.h"
	34	#include "vivid-ctrls.h"
	35	#include "vivid-sdr-cap.h"
	36
7615f4bc AP	37	/* stream formats */
	38	struct vivid_format {
	39	u32 pixelformat;
	40	u32 buffersize;
	41	};
	42
	43	/* format descriptions for capture and preview */
60f68735	44	static const struct vivid_format formats[] = {
7615f4bc AP	45	{
	46	.pixelformat = V4L2_SDR_FMT_CU8,
	47	.buffersize = SDR_CAP_SAMPLES_PER_BUF * 2,
	48	}, {
	49	.pixelformat = V4L2_SDR_FMT_CS8,
	50	.buffersize = SDR_CAP_SAMPLES_PER_BUF * 2,
	51	},
	52	};
	53
6de8653f HV	54	static const struct v4l2_frequency_band bands_adc[] = {
	55	{
	56	.tuner = 0,
	57	.type = V4L2_TUNER_ADC,
	58	.index = 0,
	59	.capability = V4L2_TUNER_CAP_1HZ \| V4L2_TUNER_CAP_FREQ_BANDS,
	60	.rangelow = 300000,
	61	.rangehigh = 300000,
	62	},
	63	{
	64	.tuner = 0,
	65	.type = V4L2_TUNER_ADC,
	66	.index = 1,
	67	.capability = V4L2_TUNER_CAP_1HZ \| V4L2_TUNER_CAP_FREQ_BANDS,
	68	.rangelow = 900001,
	69	.rangehigh = 2800000,
	70	},
	71	{
	72	.tuner = 0,
	73	.type = V4L2_TUNER_ADC,
	74	.index = 2,
	75	.capability = V4L2_TUNER_CAP_1HZ \| V4L2_TUNER_CAP_FREQ_BANDS,
	76	.rangelow = 3200000,
	77	.rangehigh = 3200000,
	78	},
	79	};
	80
	81	/* ADC band midpoints */
	82	#define BAND_ADC_0 ((bands_adc[0].rangehigh + bands_adc[1].rangelow) / 2)
	83	#define BAND_ADC_1 ((bands_adc[1].rangehigh + bands_adc[2].rangelow) / 2)
	84
	85	static const struct v4l2_frequency_band bands_fm[] = {
	86	{
	87	.tuner = 1,
	88	.type = V4L2_TUNER_RF,
	89	.index = 0,
	90	.capability = V4L2_TUNER_CAP_1HZ \| V4L2_TUNER_CAP_FREQ_BANDS,
	91	.rangelow = 50000000,
	92	.rangehigh = 2000000000,
	93	},
	94	};
	95
	96	static void vivid_thread_sdr_cap_tick(struct vivid_dev *dev)
	97	{
	98	struct vivid_buffer *sdr_cap_buf = NULL;
	99
	100	dprintk(dev, 1, "SDR Capture Thread Tick\n");
	101
	102	/* Drop a certain percentage of buffers. */
	103	if (dev->perc_dropped_buffers &&
	104	prandom_u32_max(100) < dev->perc_dropped_buffers)
	105	return;
	106
	107	spin_lock(&dev->slock);
	108	if (!list_empty(&dev->sdr_cap_active)) {
	109	sdr_cap_buf = list_entry(dev->sdr_cap_active.next,
	110	struct vivid_buffer, list);
	111	list_del(&sdr_cap_buf->list);
	112	}
	113	spin_unlock(&dev->slock);
	114
	115	if (sdr_cap_buf) {
2d700715	116	sdr_cap_buf->vb.sequence = dev->sdr_cap_seq_count;
6de8653f	117	vivid_sdr_cap_process(dev, sdr_cap_buf);
d6dd645e JS	118	sdr_cap_buf->vb.vb2_buf.timestamp =
d6dd645e JS	119	ktime_get_ns() + dev->time_wrap_offset;
2d700715	120	vb2_buffer_done(&sdr_cap_buf->vb.vb2_buf, dev->dqbuf_error ?
6de8653f HV	121	VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
	122	dev->dqbuf_error = false;
	123	}
	124	}
	125
	126	static int vivid_thread_sdr_cap(void *data)
	127	{
	128	struct vivid_dev *dev = data;
	129	u64 samples_since_start;
	130	u64 buffers_since_start;
	131	u64 next_jiffies_since_start;
	132	unsigned long jiffies_since_start;
	133	unsigned long cur_jiffies;
	134	unsigned wait_jiffies;
	135
	136	dprintk(dev, 1, "SDR Capture Thread Start\n");
	137
	138	set_freezable();
	139
	140	/* Resets frame counters */
	141	dev->sdr_cap_seq_offset = 0;
	142	if (dev->seq_wrap)
	143	dev->sdr_cap_seq_offset = 0xffffff80U;
	144	dev->jiffies_sdr_cap = jiffies;
	145	dev->sdr_cap_seq_resync = false;
	146
	147	for (;;) {
	148	try_to_freeze();
	149	if (kthread_should_stop())
	150	break;
	151
	152	mutex_lock(&dev->mutex);
	153	cur_jiffies = jiffies;
	154	if (dev->sdr_cap_seq_resync) {
	155	dev->jiffies_sdr_cap = cur_jiffies;
	156	dev->sdr_cap_seq_offset = dev->sdr_cap_seq_count + 1;
	157	dev->sdr_cap_seq_count = 0;
	158	dev->sdr_cap_seq_resync = false;
	159	}
	160	/* Calculate the number of jiffies since we started streaming */
	161	jiffies_since_start = cur_jiffies - dev->jiffies_sdr_cap;
	162	/* Get the number of buffers streamed since the start */
2d700715 JS	163	buffers_since_start =
2d700715 JS	164	(u64)jiffies_since_start * dev->sdr_adc_freq +
6de8653f HV	165	(HZ * SDR_CAP_SAMPLES_PER_BUF) / 2;
	166	do_div(buffers_since_start, HZ * SDR_CAP_SAMPLES_PER_BUF);
	167
	168	/*
	169	* After more than 0xf0000000 (rounded down to a multiple of
	170	* 'jiffies-per-day' to ease jiffies_to_msecs calculation)
	171	* jiffies have passed since we started streaming reset the
	172	* counters and keep track of the sequence offset.
	173	*/
	174	if (jiffies_since_start > JIFFIES_RESYNC) {
	175	dev->jiffies_sdr_cap = cur_jiffies;
	176	dev->sdr_cap_seq_offset = buffers_since_start;
	177	buffers_since_start = 0;
	178	}
2d700715 JS	179	dev->sdr_cap_seq_count =
2d700715 JS	180	buffers_since_start + dev->sdr_cap_seq_offset;
6de8653f HV	181
	182	vivid_thread_sdr_cap_tick(dev);
	183	mutex_unlock(&dev->mutex);
	184
	185	/*
	186	* Calculate the number of samples streamed since we started,
	187	* not including the current buffer.
	188	*/
	189	samples_since_start = buffers_since_start * SDR_CAP_SAMPLES_PER_BUF;
	190
	191	/* And the number of jiffies since we started */
	192	jiffies_since_start = jiffies - dev->jiffies_sdr_cap;
	193
	194	/* Increase by the number of samples in one buffer */
	195	samples_since_start += SDR_CAP_SAMPLES_PER_BUF;
	196	/*
	197	* Calculate when that next buffer is supposed to start
	198	* in jiffies since we started streaming.
	199	*/
	200	next_jiffies_since_start = samples_since_start * HZ +
	201	dev->sdr_adc_freq / 2;
	202	do_div(next_jiffies_since_start, dev->sdr_adc_freq);
	203	/* If it is in the past, then just schedule asap */
	204	if (next_jiffies_since_start < jiffies_since_start)
	205	next_jiffies_since_start = jiffies_since_start;
	206
	207	wait_jiffies = next_jiffies_since_start - jiffies_since_start;
	208	schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
	209	}
	210	dprintk(dev, 1, "SDR Capture Thread End\n");
	211	return 0;
	212	}
	213
df9ecb0c	214	static int sdr_cap_queue_setup(struct vb2_queue *vq,
6de8653f	215	unsigned nbuffers, unsigned nplanes,
36c0f8b3	216	unsigned sizes[], struct device *alloc_devs[])
6de8653f HV	217	{
	218	/* 2 = max 16-bit sample returned */
	219	sizes[0] = SDR_CAP_SAMPLES_PER_BUF * 2;
	220	*nplanes = 1;
	221	return 0;
	222	}
	223
	224	static int sdr_cap_buf_prepare(struct vb2_buffer *vb)
	225	{
	226	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
	227	unsigned size = SDR_CAP_SAMPLES_PER_BUF * 2;
	228
	229	dprintk(dev, 1, "%s\n", __func__);
	230
	231	if (dev->buf_prepare_error) {
	232	/*
	233	* Error injection: test what happens if buf_prepare() returns
	234	* an error.
	235	*/
	236	dev->buf_prepare_error = false;
	237	return -EINVAL;
	238	}
	239	if (vb2_plane_size(vb, 0) < size) {
	240	dprintk(dev, 1, "%s data will not fit into plane (%lu < %u)\n",
	241	__func__, vb2_plane_size(vb, 0), size);
	242	return -EINVAL;
	243	}
	244	vb2_set_plane_payload(vb, 0, size);
	245
	246	return 0;
	247	}
	248
	249	static void sdr_cap_buf_queue(struct vb2_buffer *vb)
	250	{
2d700715	251	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
6de8653f	252	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
2d700715	253	struct vivid_buffer *buf = container_of(vbuf, struct vivid_buffer, vb);
6de8653f HV	254
	255	dprintk(dev, 1, "%s\n", __func__);
	256
	257	spin_lock(&dev->slock);
	258	list_add_tail(&buf->list, &dev->sdr_cap_active);
	259	spin_unlock(&dev->slock);
	260	}
	261
	262	static int sdr_cap_start_streaming(struct vb2_queue *vq, unsigned count)
	263	{
	264	struct vivid_dev *dev = vb2_get_drv_priv(vq);
	265	int err = 0;
	266
	267	dprintk(dev, 1, "%s\n", __func__);
	268	dev->sdr_cap_seq_count = 0;
	269	if (dev->start_streaming_error) {
	270	dev->start_streaming_error = false;
	271	err = -EINVAL;
	272	} else if (dev->kthread_sdr_cap == NULL) {
	273	dev->kthread_sdr_cap = kthread_run(vivid_thread_sdr_cap, dev,
	274	"%s-sdr-cap", dev->v4l2_dev.name);
	275
	276	if (IS_ERR(dev->kthread_sdr_cap)) {
	277	v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
	278	err = PTR_ERR(dev->kthread_sdr_cap);
	279	dev->kthread_sdr_cap = NULL;
	280	}
	281	}
	282	if (err) {
	283	struct vivid_buffer buf, tmp;
	284
	285	list_for_each_entry_safe(buf, tmp, &dev->sdr_cap_active, list) {
	286	list_del(&buf->list);
2d700715 JS	287	vb2_buffer_done(&buf->vb.vb2_buf,
2d700715 JS	288	VB2_BUF_STATE_QUEUED);
6de8653f HV	289	}
	290	}
	291	return err;
	292	}
	293
	294	/* abort streaming and wait for last buffer */
	295	static void sdr_cap_stop_streaming(struct vb2_queue *vq)
	296	{
	297	struct vivid_dev *dev = vb2_get_drv_priv(vq);
	298
	299	if (dev->kthread_sdr_cap == NULL)
	300	return;
	301
	302	while (!list_empty(&dev->sdr_cap_active)) {
	303	struct vivid_buffer *buf;
	304
2d700715 JS	305	buf = list_entry(dev->sdr_cap_active.next,
2d700715 JS	306	struct vivid_buffer, list);
6de8653f	307	list_del(&buf->list);
2d700715	308	vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
6de8653f HV	309	}
	310
	311	/* shutdown control thread */
	312	mutex_unlock(&dev->mutex);
	313	kthread_stop(dev->kthread_sdr_cap);
	314	dev->kthread_sdr_cap = NULL;
	315	mutex_lock(&dev->mutex);
	316	}
	317
	318	const struct vb2_ops vivid_sdr_cap_qops = {
	319	.queue_setup = sdr_cap_queue_setup,
	320	.buf_prepare = sdr_cap_buf_prepare,
	321	.buf_queue = sdr_cap_buf_queue,
	322	.start_streaming = sdr_cap_start_streaming,
	323	.stop_streaming = sdr_cap_stop_streaming,
6dfa5131 PL	324	.wait_prepare = vb2_ops_wait_prepare,
6dfa5131 PL	325	.wait_finish = vb2_ops_wait_finish,
6de8653f HV	326	};
6de8653f HV	327
2d700715 JS	328	int vivid_sdr_enum_freq_bands(struct file file, void fh,
2d700715 JS	329	struct v4l2_frequency_band *band)
6de8653f HV	330	{
	331	switch (band->tuner) {
	332	case 0:
	333	if (band->index >= ARRAY_SIZE(bands_adc))
	334	return -EINVAL;
	335	*band = bands_adc[band->index];
	336	return 0;
	337	case 1:
	338	if (band->index >= ARRAY_SIZE(bands_fm))
	339	return -EINVAL;
	340	*band = bands_fm[band->index];
	341	return 0;
	342	default:
	343	return -EINVAL;
	344	}
	345	}
	346
2d700715 JS	347	int vivid_sdr_g_frequency(struct file file, void fh,
2d700715 JS	348	struct v4l2_frequency *vf)
6de8653f HV	349	{
	350	struct vivid_dev *dev = video_drvdata(file);
	351
	352	switch (vf->tuner) {
	353	case 0:
	354	vf->frequency = dev->sdr_adc_freq;
	355	vf->type = V4L2_TUNER_ADC;
	356	return 0;
	357	case 1:
	358	vf->frequency = dev->sdr_fm_freq;
	359	vf->type = V4L2_TUNER_RF;
	360	return 0;
	361	default:
	362	return -EINVAL;
	363	}
	364	}
	365
2d700715 JS	366	int vivid_sdr_s_frequency(struct file file, void fh,
2d700715 JS	367	const struct v4l2_frequency *vf)
6de8653f HV	368	{
	369	struct vivid_dev *dev = video_drvdata(file);
	370	unsigned freq = vf->frequency;
	371	unsigned band;
	372
	373	switch (vf->tuner) {
	374	case 0:
	375	if (vf->type != V4L2_TUNER_ADC)
	376	return -EINVAL;
	377	if (freq < BAND_ADC_0)
	378	band = 0;
	379	else if (freq < BAND_ADC_1)
	380	band = 1;
	381	else
	382	band = 2;
	383
	384	freq = clamp_t(unsigned, freq,
	385	bands_adc[band].rangelow,
	386	bands_adc[band].rangehigh);
	387
	388	if (vb2_is_streaming(&dev->vb_sdr_cap_q) &&
	389	freq != dev->sdr_adc_freq) {
	390	/* resync the thread's timings */
	391	dev->sdr_cap_seq_resync = true;
	392	}
	393	dev->sdr_adc_freq = freq;
	394	return 0;
	395	case 1:
	396	if (vf->type != V4L2_TUNER_RF)
	397	return -EINVAL;
	398	dev->sdr_fm_freq = clamp_t(unsigned, freq,
	399	bands_fm[0].rangelow,
	400	bands_fm[0].rangehigh);
	401	return 0;
	402	default:
	403	return -EINVAL;
	404	}
	405	}
	406
	407	int vivid_sdr_g_tuner(struct file file, void fh, struct v4l2_tuner *vt)
	408	{
	409	switch (vt->index) {
	410	case 0:
	411	strlcpy(vt->name, "ADC", sizeof(vt->name));
	412	vt->type = V4L2_TUNER_ADC;
2d700715 JS	413	vt->capability =
2d700715 JS	414	V4L2_TUNER_CAP_1HZ \| V4L2_TUNER_CAP_FREQ_BANDS;
6de8653f HV	415	vt->rangelow = bands_adc[0].rangelow;
	416	vt->rangehigh = bands_adc[2].rangehigh;
	417	return 0;
	418	case 1:
	419	strlcpy(vt->name, "RF", sizeof(vt->name));
	420	vt->type = V4L2_TUNER_RF;
2d700715 JS	421	vt->capability =
2d700715 JS	422	V4L2_TUNER_CAP_1HZ \| V4L2_TUNER_CAP_FREQ_BANDS;
6de8653f HV	423	vt->rangelow = bands_fm[0].rangelow;
	424	vt->rangehigh = bands_fm[0].rangehigh;
	425	return 0;
	426	default:
	427	return -EINVAL;
	428	}
	429	}
	430
	431	int vivid_sdr_s_tuner(struct file file, void fh, const struct v4l2_tuner *vt)
	432	{
	433	if (vt->index > 1)
	434	return -EINVAL;
	435	return 0;
	436	}
	437
	438	int vidioc_enum_fmt_sdr_cap(struct file file, void fh, struct v4l2_fmtdesc *f)
	439	{
7615f4bc	440	if (f->index >= ARRAY_SIZE(formats))
6de8653f	441	return -EINVAL;
7615f4bc	442	f->pixelformat = formats[f->index].pixelformat;
6de8653f HV	443	return 0;
	444	}
	445
	446	int vidioc_g_fmt_sdr_cap(struct file file, void fh, struct v4l2_format *f)
	447	{
7615f4bc AP	448	struct vivid_dev *dev = video_drvdata(file);
	449
	450	f->fmt.sdr.pixelformat = dev->sdr_pixelformat;
	451	f->fmt.sdr.buffersize = dev->sdr_buffersize;
6de8653f HV	452	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
	453	return 0;
	454	}
	455
7615f4bc AP	456	int vidioc_s_fmt_sdr_cap(struct file file, void fh, struct v4l2_format *f)
	457	{
	458	struct vivid_dev *dev = video_drvdata(file);
	459	struct vb2_queue *q = &dev->vb_sdr_cap_q;
	460	int i;
	461
	462	if (vb2_is_busy(q))
	463	return -EBUSY;
	464
	465	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
	466	for (i = 0; i < ARRAY_SIZE(formats); i++) {
	467	if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
	468	dev->sdr_pixelformat = formats[i].pixelformat;
	469	dev->sdr_buffersize = formats[i].buffersize;
	470	f->fmt.sdr.buffersize = formats[i].buffersize;
	471	return 0;
	472	}
	473	}
	474	dev->sdr_pixelformat = formats[0].pixelformat;
	475	dev->sdr_buffersize = formats[0].buffersize;
	476	f->fmt.sdr.pixelformat = formats[0].pixelformat;
	477	f->fmt.sdr.buffersize = formats[0].buffersize;
	478	return 0;
	479	}
	480
	481	int vidioc_try_fmt_sdr_cap(struct file file, void fh, struct v4l2_format *f)
	482	{
	483	int i;
	484
	485	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
	486	for (i = 0; i < ARRAY_SIZE(formats); i++) {
	487	if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
	488	f->fmt.sdr.buffersize = formats[i].buffersize;
	489	return 0;
	490	}
	491	}
	492	f->fmt.sdr.pixelformat = formats[0].pixelformat;
	493	f->fmt.sdr.buffersize = formats[0].buffersize;
	494	return 0;
	495	}
	496
4e30a373 PL	497	#define FIXP_N (15)
	498	#define FIXP_FRAC (1 << FIXP_N)
	499	#define FIXP_2PI ((int)(2 * 3.141592653589 * FIXP_FRAC))
f335c3f2	500	#define M_100000PI (3.14159 * 100000)
6de8653f HV	501
	502	void vivid_sdr_cap_process(struct vivid_dev dev, struct vivid_buffer buf)
	503	{
2d700715	504	u8 *vbuf = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
6de8653f	505	unsigned long i;
2d700715	506	unsigned long plane_size = vb2_plane_size(&buf->vb.vb2_buf, 0);
f335c3f2	507	s64 s64tmp;
4e30a373 PL	508	s32 src_phase_step;
	509	s32 mod_phase_step;
	510	s32 fixp_i;
	511	s32 fixp_q;
6de8653f	512
6de8653f HV	513	/* calculate phase step */
6de8653f HV	514	#define BEEP_FREQ 1000 /* 1kHz beep */
4e30a373	515	src_phase_step = DIV_ROUND_CLOSEST(FIXP_2PI * BEEP_FREQ,
60f68735	516	dev->sdr_adc_freq);
6de8653f HV	517
6de8653f HV	518	for (i = 0; i < plane_size; i += 2) {
4e30a373 PL	519	mod_phase_step = fixp_cos32_rad(dev->sdr_fixp_src_phase,
	520	FIXP_2PI) >> (31 - FIXP_N);
	521
	522	dev->sdr_fixp_src_phase += src_phase_step;
f335c3f2 AP	523	s64tmp = (s64) mod_phase_step * dev->sdr_fm_deviation;
f335c3f2 AP	524	dev->sdr_fixp_mod_phase += div_s64(s64tmp, M_100000PI);
6de8653f HV	525
6de8653f HV	526	/*
60f68735	527	* Transfer phase angle to [0, 2xPI] in order to avoid variable
6de8653f HV	528	* overflow and make it suitable for cosine implementation
	529	* used, which does not support negative angles.
	530	*/
60f68735 AP	531	dev->sdr_fixp_src_phase %= FIXP_2PI;
60f68735 AP	532	dev->sdr_fixp_mod_phase %= FIXP_2PI;
4e30a373	533
60f68735 AP	534	if (dev->sdr_fixp_mod_phase < 0)
60f68735 AP	535	dev->sdr_fixp_mod_phase += FIXP_2PI;
6de8653f	536
4e30a373 PL	537	fixp_i = fixp_cos32_rad(dev->sdr_fixp_mod_phase, FIXP_2PI);
4e30a373 PL	538	fixp_q = fixp_sin32_rad(dev->sdr_fixp_mod_phase, FIXP_2PI);
6de8653f	539
4e30a373 PL	540	/* Normalize fraction values represented with 32 bit precision
	541	* to fixed point representation with FIXP_N bits */
	542	fixp_i >>= (31 - FIXP_N);
	543	fixp_q >>= (31 - FIXP_N);
6de8653f	544
7615f4bc AP	545	switch (dev->sdr_pixelformat) {
7615f4bc AP	546	case V4L2_SDR_FMT_CU8:
60f68735	547	/* convert 'fixp float' to u8 [0, +255] */
7615f4bc AP	548	/* u8 = X * 127.5 + 127.5; X is float [-1.0, +1.0] */
	549	fixp_i = fixp_i * 1275 + FIXP_FRAC * 1275;
	550	fixp_q = fixp_q * 1275 + FIXP_FRAC * 1275;
	551	vbuf++ = DIV_ROUND_CLOSEST(fixp_i, FIXP_FRAC 10);
	552	vbuf++ = DIV_ROUND_CLOSEST(fixp_q, FIXP_FRAC 10);
	553	break;
	554	case V4L2_SDR_FMT_CS8:
60f68735 AP	555	/* convert 'fixp float' to s8 [-128, +127] */
	556	/* s8 = X * 127.5 - 0.5; X is float [-1.0, +1.0] */
	557	fixp_i = fixp_i * 1275 - FIXP_FRAC * 5;
	558	fixp_q = fixp_q * 1275 - FIXP_FRAC * 5;
7615f4bc AP	559	vbuf++ = DIV_ROUND_CLOSEST(fixp_i, FIXP_FRAC 10);
	560	vbuf++ = DIV_ROUND_CLOSEST(fixp_q, FIXP_FRAC 10);
	561	break;
	562	default:
	563	break;
	564	}
6de8653f HV	565	}
6de8653f HV	566	}