// SPDX-License-Identifier: GPL-2.0-only
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/*
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* vivid-kthread-touch.c - touch capture thread support functions.
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*
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*/
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#include <linux/freezer.h>
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#include "vivid-core.h"
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#include "vivid-kthread-touch.h"
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#include "vivid-touch-cap.h"
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static noinline_for_stack void vivid_thread_tch_cap_tick(struct vivid_dev *dev,
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int dropped_bufs)
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{
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struct vivid_buffer *tch_cap_buf = NULL;
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spin_lock(&dev->slock);
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if (!list_empty(&dev->touch_cap_active)) {
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tch_cap_buf = list_entry(dev->touch_cap_active.next,
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struct vivid_buffer, list);
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list_del(&tch_cap_buf->list);
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}
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spin_unlock(&dev->slock);
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if (tch_cap_buf) {
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v4l2_ctrl_request_setup(tch_cap_buf->vb.vb2_buf.req_obj.req,
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&dev->ctrl_hdl_touch_cap);
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vivid_fillbuff_tch(dev, tch_cap_buf);
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v4l2_ctrl_request_complete(tch_cap_buf->vb.vb2_buf.req_obj.req,
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&dev->ctrl_hdl_touch_cap);
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vb2_buffer_done(&tch_cap_buf->vb.vb2_buf, dev->dqbuf_error ?
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VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
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dprintk(dev, 2, "touch_cap buffer %d done\n",
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tch_cap_buf->vb.vb2_buf.index);
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tch_cap_buf->vb.vb2_buf.timestamp = ktime_get_ns() + dev->time_wrap_offset;
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}
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dev->dqbuf_error = false;
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}
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static int vivid_thread_touch_cap(void *data)
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{
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struct vivid_dev *dev = data;
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u64 numerators_since_start;
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u64 buffers_since_start;
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u64 next_jiffies_since_start;
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unsigned long jiffies_since_start;
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unsigned long cur_jiffies;
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unsigned int wait_jiffies;
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unsigned int numerator;
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unsigned int denominator;
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int dropped_bufs;
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dprintk(dev, 1, "Touch Capture Thread Start\n");
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set_freezable();
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/* Resets frame counters */
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dev->touch_cap_seq_offset = 0;
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dev->touch_cap_seq_count = 0;
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dev->touch_cap_seq_resync = false;
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dev->jiffies_touch_cap = jiffies;
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for (;;) {
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try_to_freeze();
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if (kthread_should_stop())
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break;
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if (!mutex_trylock(&dev->mutex)) {
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schedule_timeout_uninterruptible(1);
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continue;
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}
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cur_jiffies = jiffies;
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if (dev->touch_cap_seq_resync) {
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dev->jiffies_touch_cap = cur_jiffies;
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dev->touch_cap_seq_offset = dev->touch_cap_seq_count + 1;
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dev->touch_cap_seq_count = 0;
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dev->cap_seq_resync = false;
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}
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denominator = dev->timeperframe_tch_cap.denominator;
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numerator = dev->timeperframe_tch_cap.numerator;
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/* Calculate the number of jiffies since we started streaming */
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jiffies_since_start = cur_jiffies - dev->jiffies_touch_cap;
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/* Get the number of buffers streamed since the start */
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buffers_since_start = (u64)jiffies_since_start * denominator +
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(HZ * numerator) / 2;
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do_div(buffers_since_start, HZ * numerator);
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/*
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* After more than 0xf0000000 (rounded down to a multiple of
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* 'jiffies-per-day' to ease jiffies_to_msecs calculation)
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* jiffies have passed since we started streaming reset the
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* counters and keep track of the sequence offset.
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*/
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if (jiffies_since_start > JIFFIES_RESYNC) {
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dev->jiffies_touch_cap = cur_jiffies;
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dev->cap_seq_offset = buffers_since_start;
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buffers_since_start = 0;
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}
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dropped_bufs = buffers_since_start + dev->touch_cap_seq_offset - dev->touch_cap_seq_count;
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dev->touch_cap_seq_count = buffers_since_start + dev->touch_cap_seq_offset;
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vivid_thread_tch_cap_tick(dev, dropped_bufs);
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/*
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* Calculate the number of 'numerators' streamed
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* since we started, including the current buffer.
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*/
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numerators_since_start = ++buffers_since_start * numerator;
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/* And the number of jiffies since we started */
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jiffies_since_start = jiffies - dev->jiffies_touch_cap;
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mutex_unlock(&dev->mutex);
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/*
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* Calculate when that next buffer is supposed to start
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* in jiffies since we started streaming.
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*/
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next_jiffies_since_start = numerators_since_start * HZ +
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denominator / 2;
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do_div(next_jiffies_since_start, denominator);
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/* If it is in the past, then just schedule asap */
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if (next_jiffies_since_start < jiffies_since_start)
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next_jiffies_since_start = jiffies_since_start;
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wait_jiffies = next_jiffies_since_start - jiffies_since_start;
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schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
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}
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dprintk(dev, 1, "Touch Capture Thread End\n");
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return 0;
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}
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int vivid_start_generating_touch_cap(struct vivid_dev *dev)
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{
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if (dev->kthread_touch_cap) {
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dev->touch_cap_streaming = true;
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return 0;
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}
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dev->kthread_touch_cap = kthread_run(vivid_thread_touch_cap, dev,
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"%s-tch-cap", dev->v4l2_dev.name);
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if (IS_ERR(dev->kthread_touch_cap)) {
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int err = PTR_ERR(dev->kthread_touch_cap);
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dev->kthread_touch_cap = NULL;
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v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
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return err;
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}
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dev->touch_cap_streaming = true;
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dprintk(dev, 1, "returning from %s\n", __func__);
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return 0;
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}
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void vivid_stop_generating_touch_cap(struct vivid_dev *dev)
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{
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if (!dev->kthread_touch_cap)
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return;
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dev->touch_cap_streaming = false;
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while (!list_empty(&dev->touch_cap_active)) {
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struct vivid_buffer *buf;
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buf = list_entry(dev->touch_cap_active.next,
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struct vivid_buffer, list);
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list_del(&buf->list);
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v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req,
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&dev->ctrl_hdl_touch_cap);
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vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
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dprintk(dev, 2, "touch_cap buffer %d done\n",
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buf->vb.vb2_buf.index);
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}
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kthread_stop(dev->kthread_touch_cap);
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dev->kthread_touch_cap = NULL;
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}
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