| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * vivid-sdr-cap.c - software defined radio support functions. |
| * |
| * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved. |
| */ |
| |
| #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; |
| v4l2_ctrl_request_setup(sdr_cap_buf->vb.vb2_buf.req_obj.req, |
| &dev->ctrl_hdl_sdr_cap); |
| v4l2_ctrl_request_complete(sdr_cap_buf->vb.vb2_buf.req_obj.req, |
| &dev->ctrl_hdl_sdr_cap); |
| 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; |
| |
| if (!mutex_trylock(&dev->mutex)) { |
| schedule(); |
| continue; |
| } |
| |
| 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; |
| while (jiffies - cur_jiffies < wait_jiffies && |
| !kthread_should_stop()) |
| schedule(); |
| } |
| 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); |
| v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req, |
| &dev->ctrl_hdl_sdr_cap); |
| vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); |
| } |
| |
| /* shutdown control thread */ |
| kthread_stop(dev->kthread_sdr_cap); |
| dev->kthread_sdr_cap = NULL; |
| } |
| |
| static void sdr_cap_buf_request_complete(struct vb2_buffer *vb) |
| { |
| struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue); |
| |
| v4l2_ctrl_request_complete(vb->req_obj.req, &dev->ctrl_hdl_sdr_cap); |
| } |
| |
| 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, |
| .buf_request_complete = sdr_cap_buf_request_complete, |
| .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: |
| strscpy(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: |
| strscpy(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; |
| } |
| } |
| } |