media: cxd2880: Add integration layer for the driver

These functions monitor the driver and watch for task completion.
This is part of the Sony CXD2880 DVB-T2/T tuner + demodulator driver.
Signed-off-by: Yasunari Takiguchi <Yasunari.Takiguchi@sony.com>
Signed-off-by: Masayuki Yamamoto <Masayuki.Yamamoto@sony.com>
Signed-off-by: Hideki Nozawa <Hideki.Nozawa@sony.com>
Signed-off-by: Kota Yonezawa <Kota.Yonezawa@sony.com>
Signed-off-by: Toshihiko Matsumoto <Toshihiko.Matsumoto@sony.com>
Signed-off-by: Satoshi Watanabe <Satoshi.C.Watanabe@sony.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-frontends/cxd2880/cxd2880_integ.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cxd2880_integ.c
+ * Sony CXD2880 DVB-T2/T tuner + demodulator driver
+ * integration layer common functions
+ *
+ * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
+ */
+
+#include <linux/ktime.h>
+#include <linux/errno.h>
+
+#include "cxd2880_tnrdmd.h"
+#include "cxd2880_tnrdmd_mon.h"
+#include "cxd2880_integ.h"
+
+int cxd2880_integ_init(struct cxd2880_tnrdmd *tnr_dmd)
+{
+	int ret;
+	ktime_t start;
+	u8 cpu_task_completed = 0;
+
+	if (!tnr_dmd)
+		return -EINVAL;
+
+	ret = cxd2880_tnrdmd_init1(tnr_dmd);
+	if (ret)
+		return ret;
+
+	start = ktime_get();
+
+	while (1) {
+		ret =
+		    cxd2880_tnrdmd_check_internal_cpu_status(tnr_dmd,
+						     &cpu_task_completed);
+		if (ret)
+			return ret;
+
+		if (cpu_task_completed)
+			break;
+
+		if (ktime_to_ms(ktime_sub(ktime_get(), start)) >
+					CXD2880_TNRDMD_WAIT_INIT_TIMEOUT)
+			return -ETIMEDOUT;
+
+		usleep_range(CXD2880_TNRDMD_WAIT_INIT_INTVL,
+			     CXD2880_TNRDMD_WAIT_INIT_INTVL + 1000);
+	}
+
+	return cxd2880_tnrdmd_init2(tnr_dmd);
+}
+
+int cxd2880_integ_cancel(struct cxd2880_tnrdmd *tnr_dmd)
+{
+	if (!tnr_dmd)
+		return -EINVAL;
+
+	atomic_set(&tnr_dmd->cancel, 1);
+
+	return 0;
+}
+
+int cxd2880_integ_check_cancellation(struct cxd2880_tnrdmd *tnr_dmd)
+{
+	if (!tnr_dmd)
+		return -EINVAL;
+
+	if (atomic_read(&tnr_dmd->cancel) != 0)
+		return -ECANCELED;
+
+	return 0;
+}

drivers/media/dvb-frontends/cxd2880/cxd2880_integ.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * cxd2880_integ.h
+ * Sony CXD2880 DVB-T2/T tuner + demodulator driver
+ * integration layer common interface
+ *
+ * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
+ */
+
+#ifndef CXD2880_INTEG_H
+#define CXD2880_INTEG_H
+
+#include "cxd2880_tnrdmd.h"
+
+#define CXD2880_TNRDMD_WAIT_INIT_TIMEOUT	500
+#define CXD2880_TNRDMD_WAIT_INIT_INTVL	10
+
+#define CXD2880_TNRDMD_WAIT_AGC_STABLE		100
+
+int cxd2880_integ_init(struct cxd2880_tnrdmd *tnr_dmd);
+
+int cxd2880_integ_cancel(struct cxd2880_tnrdmd *tnr_dmd);
+
+int cxd2880_integ_check_cancellation(struct cxd2880_tnrdmd
+				     *tnr_dmd);
+
+#endif