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path: root/drivers/media/platform/vivid/vivid-kthread-touch.c
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Diffstat (limited to 'drivers/media/platform/vivid/vivid-kthread-touch.c')
-rw-r--r--drivers/media/platform/vivid/vivid-kthread-touch.c181
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/media/platform/vivid/vivid-kthread-touch.c b/drivers/media/platform/vivid/vivid-kthread-touch.c
new file mode 100644
index 000000000000..674507b5ccb5
--- /dev/null
+++ b/drivers/media/platform/vivid/vivid-kthread-touch.c
@@ -0,0 +1,181 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * vivid-kthread-touch.c - touch capture thread support functions.
+ *
+ */
+
+#include <linux/freezer.h>
+#include "vivid-core.h"
+#include "vivid-kthread-touch.h"
+#include "vivid-touch-cap.h"
+
+static noinline_for_stack void vivid_thread_tch_cap_tick(struct vivid_dev *dev,
+ int dropped_bufs)
+{
+ struct vivid_buffer *tch_cap_buf = NULL;
+
+ spin_lock(&dev->slock);
+ if (!list_empty(&dev->touch_cap_active)) {
+ tch_cap_buf = list_entry(dev->touch_cap_active.next,
+ struct vivid_buffer, list);
+ list_del(&tch_cap_buf->list);
+ }
+
+ spin_unlock(&dev->slock);
+
+ if (tch_cap_buf) {
+ v4l2_ctrl_request_setup(tch_cap_buf->vb.vb2_buf.req_obj.req,
+ &dev->ctrl_hdl_touch_cap);
+
+ vivid_fillbuff_tch(dev, tch_cap_buf);
+ v4l2_ctrl_request_complete(tch_cap_buf->vb.vb2_buf.req_obj.req,
+ &dev->ctrl_hdl_touch_cap);
+ vb2_buffer_done(&tch_cap_buf->vb.vb2_buf, dev->dqbuf_error ?
+ VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
+ dprintk(dev, 2, "touch_cap buffer %d done\n",
+ tch_cap_buf->vb.vb2_buf.index);
+
+ tch_cap_buf->vb.vb2_buf.timestamp = ktime_get_ns() + dev->time_wrap_offset;
+ }
+ dev->dqbuf_error = false;
+}
+
+static int vivid_thread_touch_cap(void *data)
+{
+ struct vivid_dev *dev = data;
+ u64 numerators_since_start;
+ u64 buffers_since_start;
+ u64 next_jiffies_since_start;
+ unsigned long jiffies_since_start;
+ unsigned long cur_jiffies;
+ unsigned int wait_jiffies;
+ unsigned int numerator;
+ unsigned int denominator;
+ int dropped_bufs;
+
+ dprintk(dev, 1, "Touch Capture Thread Start\n");
+
+ set_freezable();
+
+ /* Resets frame counters */
+ dev->touch_cap_seq_offset = 0;
+ dev->touch_cap_seq_count = 0;
+ dev->touch_cap_seq_resync = false;
+ dev->jiffies_touch_cap = jiffies;
+
+ for (;;) {
+ try_to_freeze();
+ if (kthread_should_stop())
+ break;
+
+ if (!mutex_trylock(&dev->mutex)) {
+ schedule_timeout_uninterruptible(1);
+ continue;
+ }
+ cur_jiffies = jiffies;
+ if (dev->touch_cap_seq_resync) {
+ dev->jiffies_touch_cap = cur_jiffies;
+ dev->touch_cap_seq_offset = dev->touch_cap_seq_count + 1;
+ dev->touch_cap_seq_count = 0;
+ dev->cap_seq_resync = false;
+ }
+ denominator = dev->timeperframe_tch_cap.denominator;
+ numerator = dev->timeperframe_tch_cap.numerator;
+
+ /* Calculate the number of jiffies since we started streaming */
+ jiffies_since_start = cur_jiffies - dev->jiffies_touch_cap;
+ /* Get the number of buffers streamed since the start */
+ buffers_since_start = (u64)jiffies_since_start * denominator +
+ (HZ * numerator) / 2;
+ do_div(buffers_since_start, HZ * numerator);
+
+ /*
+ * 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_touch_cap = cur_jiffies;
+ dev->cap_seq_offset = buffers_since_start;
+ buffers_since_start = 0;
+ }
+ dropped_bufs = buffers_since_start + dev->touch_cap_seq_offset - dev->touch_cap_seq_count;
+ dev->touch_cap_seq_count = buffers_since_start + dev->touch_cap_seq_offset;
+
+ vivid_thread_tch_cap_tick(dev, dropped_bufs);
+
+ /*
+ * Calculate the number of 'numerators' streamed
+ * since we started, including the current buffer.
+ */
+ numerators_since_start = ++buffers_since_start * numerator;
+
+ /* And the number of jiffies since we started */
+ jiffies_since_start = jiffies - dev->jiffies_touch_cap;
+
+ mutex_unlock(&dev->mutex);
+
+ /*
+ * Calculate when that next buffer is supposed to start
+ * in jiffies since we started streaming.
+ */
+ next_jiffies_since_start = numerators_since_start * HZ +
+ denominator / 2;
+ do_div(next_jiffies_since_start, denominator);
+ /* 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, "Touch Capture Thread End\n");
+ return 0;
+}
+
+int vivid_start_generating_touch_cap(struct vivid_dev *dev)
+{
+ if (dev->kthread_touch_cap) {
+ dev->touch_cap_streaming = true;
+ return 0;
+ }
+
+ dev->kthread_touch_cap = kthread_run(vivid_thread_touch_cap, dev,
+ "%s-tch-cap", dev->v4l2_dev.name);
+
+ if (IS_ERR(dev->kthread_touch_cap)) {
+ int err = PTR_ERR(dev->kthread_touch_cap);
+
+ dev->kthread_touch_cap = NULL;
+ v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
+ return err;
+ }
+ dev->touch_cap_streaming = true;
+ dprintk(dev, 1, "returning from %s\n", __func__);
+ return 0;
+}
+
+void vivid_stop_generating_touch_cap(struct vivid_dev *dev)
+{
+ if (!dev->kthread_touch_cap)
+ return;
+
+ dev->touch_cap_streaming = false;
+
+ while (!list_empty(&dev->touch_cap_active)) {
+ struct vivid_buffer *buf;
+
+ buf = list_entry(dev->touch_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_touch_cap);
+ vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+ dprintk(dev, 2, "touch_cap buffer %d done\n",
+ buf->vb.vb2_buf.index);
+ }
+
+ kthread_stop(dev->kthread_touch_cap);
+ dev->kthread_touch_cap = NULL;
+}