driver: 内部構造を変更

driver/Kbuild

@@ -5,7 +5,6 @@ DEBUG := 0
 dMAX_DEVICE := 0
 dPSB_DEBUG := 0
 dITEDTV_BUS_USE_WORKQUEUE := 0
-dRINGBUFFER_USE_SPINLOCK := 0
 
 ccflags-y := -I$(M)/../include
 
@@ -13,8 +12,8 @@ ifneq ($(DEBUG),0)
 ccflags-y += -DDEBUG -g
 endif
 
-ifneq ($(dMAX_DEVICE),0)
-ccflags-y += -DMAX_DEVICE=$(dMAX_DEVICE)
+ifneq ($(dPX4_USB_MAX_DEVICE),0)
+ccflags-y += -DMAX_DEVICE=$(dPX4_USB_MAX_DEVICE)
 endif
 ifneq ($(dPSB_DEBUG),0)
 ccflags-y += -DPSB_DEBUG
@@ -22,9 +21,6 @@ endif
 ifneq ($(dITEDTV_BUS_USE_WORKQUEUE),0)
 ccflags-y += -DITEDTV_BUS_USE_WORKQUEUE
 endif
-ifneq ($(dRINGBUFFER_USE_SPINLOCK),0)
-ccflags-y += -DRINGBUFFER_USE_SPINLOCK
-endif
 
 obj-m := px4_drv.o
-px4_drv-y := driver.o module_param.o px4.o isdb2056.o it930x.o itedtv_bus.o tc90522.o rt710.o r850.o ringbuffer.o
+px4_drv-y := driver_module.o ptx_chrdev.o px4_usb.o px4_usb_params.o px4_device.o px4_device_params.o px4_mldev.o isdb2056_device.o it930x.o itedtv_bus.o tc90522.o r850.o rt710.o ringbuffer.o

driver/driver.c

@@ -1,71 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Module initiator of the driver (driver.c)
- *
- * Copyright (c) 2019 nns779
- */
-
-#include "print_format.h"
-
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-
-#include "driver.h"
-#include "revision.h"
-#include "firmware.h"
-#include "px4.h"
-#include "isdb2056.h"
-
-MODULE_VERSION(DRIVER_VERSION);
-MODULE_AUTHOR("nns779");
-MODULE_DESCRIPTION("Unofficial Linux driver for PLEX PX-W3U4/Q3U4/W3PE4/Q3PE4 ISDB-T/S receivers");
-MODULE_LICENSE("GPL v2");
-
-MODULE_FIRMWARE(FIRMWARE_FILENAME);
-
-static int driver_module_init(void)
-{
-	int ret = 0;
-
-	pr_info(KBUILD_MODNAME
-#ifdef DRIVER_VERSION
-		" version " DRIVER_VERSION
-#endif
-#ifdef REVISION_NUMBER
-#if defined(DRIVER_VERSION)
-		","
-#endif
-		" rev: " REVISION_NUMBER
-#endif
-#ifdef COMMIT_HASH
-#if defined(PX4_DRIVER_VERSION) || defined(REVISION_NUMBER)
-		","
-#endif
-		" commit: " COMMIT_HASH
-#endif
-#ifdef REVISION_NAME
-		" @ " REVISION_NAME
-#endif
-		"\n");
-
-	ret = px4_register();
-	if (ret)
-		goto exit;
-
-	ret = isdb2056_register();
-	if (ret)
-		goto exit;
-
-exit:
-	return ret;
-}
-
-static void driver_module_exit(void)
-{
-	px4_unregister();
-	isdb2056_unregister();
-}
-
-module_init(driver_module_init);
-module_exit(driver_module_exit);

driver/driver.h

@@ -1,8 +0,0 @@
-// driver.h
-
-#ifndef __DRIVER_H__
-#define __DRIVER_H__
-
-#define DRIVER_VERSION	"0.2.1"
-
-#endif

driver/driver_module.c

@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Module initiator of the driver (driver_module.c)
+ *
+ * Copyright (c) 2018-2020 nns779
+ */
+
+#include "print_format.h"
+#include "driver_module.h"
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "revision.h"
+#include "px4_usb.h"
+#include "firmware.h"
+
+int init_module(void)
+{
+	int ret = 0;
+
+	pr_info(KBUILD_MODNAME
+#ifdef PX4_DRV_VERSION
+		" version " PX4_DRV_VERSION
+#endif
+#ifdef REVISION_NUMBER
+#if defined(PX4_DRV_VERSION)
+		","
+#endif
+		" rev: " REVISION_NUMBER
+#endif
+#ifdef COMMIT_HASH
+#if defined(PX4_DRV_VERSION) || defined(REVISION_NUMBER)
+		","
+#endif
+		" commit: " COMMIT_HASH
+#endif
+#ifdef REVISION_NAME
+		" @ " REVISION_NAME
+#endif
+		"\n");
+
+	ret = px4_usb_register();
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+void cleanup_module(void)
+{
+	px4_usb_unregister();
+}
+
+MODULE_VERSION(PX4_DRV_VERSION);
+MODULE_AUTHOR("nns779");
+MODULE_DESCRIPTION("Unofficial Linux driver for PLEX PX-W3U4/Q3U4/W3PE4/Q3PE4 ISDB-T/S receivers");
+MODULE_LICENSE("GPL v2");
+
+MODULE_FIRMWARE(IT930X_FIRMWARE_FILENAME);

driver/driver_module.h

@@ -0,0 +1,8 @@
+// module.h
+
+#ifndef __DRIVER_MODULE_H__
+#define __DRIVER_MODULE_H__
+
+#define PX4_DRV_VERSION	"0.4.0"
+
+#endif

driver/firmware.h

@@ -3,8 +3,6 @@
 #ifndef __FIRMWARE_H__
 #define __FIRMWARE_H__
 
-#if !defined(FIRMWARE_FILENAME)
-#define FIRMWARE_FILENAME	"it930x-firmware.bin"
-#endif
+#define IT930X_FIRMWARE_FILENAME	"it930x-firmware.bin"
 
 #endif

driver/i2c_comm.h

@@ -26,12 +26,19 @@ struct i2c_comm_request {
 };
 
 struct i2c_comm_master {
+	int (*gate_ctrl)(void *i2c_priv, bool open);
 	int (*request)(void *i2c_priv,
 		       const struct i2c_comm_request *req,
 		       int num);
 	void *priv;
 };
 
+static inline int i2c_comm_master_gate_ctrl(const struct i2c_comm_master *m,
+					    bool open)
+{
+	return ((m && m ->gate_ctrl) ? m->gate_ctrl(m->priv, open) : -EFAULT);
+}
+
 static inline int i2c_comm_master_request(const struct i2c_comm_master *m,
 					  const struct i2c_comm_request *req,
 					  int num)

driver/isdb2056.h

@@ -1,9 +0,0 @@
-// isdb2056.h
-
-#ifndef __ISDB2056_H__
-#define __ISDB2056_H__
-
-int isdb2056_register(void);
-void isdb2056_unregister(void);
-
-#endif

driver/isdb2056_device.h

@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PTX driver definitions for Digibest ISDB2056 device (isdb2056_device.h)
+ *
+ * Copyright (c) 2018-2020 nns779
+ */
+
+#ifndef __ISDB2056_DEVICE_H__
+#define __ISDB2056_DEVICE_H__
+
+#include <linux/atomic.h>
+#include <linux/kref.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+
+#include "ptx_chrdev.h"
+#include "it930x.h"
+#include "tc90522.h"
+#include "r850.h"
+#include "rt710.h"
+
+#define ISDB2056_CHRDEV_NUM	1
+
+struct isdb2056_chrdev {
+	struct ptx_chrdev *chrdev;
+	struct tc90522_demod tc90522_t;
+	struct tc90522_demod tc90522_s;
+	struct r850_tuner r850;
+	struct rt710_tuner rt710;
+};
+
+struct isdb2056_device {
+	struct kref kref;
+	atomic_t available;
+	struct device *dev;
+	struct ptx_chrdev_group *chrdev_group;
+	struct isdb2056_chrdev chrdev2056;
+	struct it930x_bridge it930x;
+	void *stream_ctx;
+};
+
+int isdb2056_device_init(struct isdb2056_device *isdb2056, struct device *dev,
+			 struct ptx_chrdev_context *chrdev_ctx);
+void isdb2056_device_term(struct isdb2056_device *isdb2056);
+
+#endif

driver/it930x.c

@@ -568,6 +568,7 @@ int it930x_init(struct it930x_bridge *it930x)
 		priv->i2c[i].it930x = it930x;
 		priv->i2c[i].bus = i + 1;
 
+		it930x->i2c_master[i].gate_ctrl = NULL;
 		it930x->i2c_master[i].request = it930x_i2c_master_request;
 		it930x->i2c_master[i].priv = &priv->i2c[i];
 	}
@@ -597,6 +598,7 @@ int it930x_term(struct it930x_bridge *it930x)
 	/* clear the i2c operator */
 
 	for (i = 0; i < 3; i++) {
+		it930x->i2c_master[i].gate_ctrl = NULL;
 		it930x->i2c_master[i].request = NULL;
 		it930x->i2c_master[i].priv = NULL;
 	}

driver/module_param.c

@@ -1,45 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Module parameter definitions (module_param.c)
- *
- * Copyright (c) 2019 nns779
- */
-
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-
-#include "module_param.h"
-
-unsigned int xfer_packets = 816;
-unsigned int urb_max_packets = 816;
-unsigned int max_urbs = 6;
-unsigned int tsdev_max_packets = 2048;
-int psb_purge_timeout = 2000;
-bool no_dma = false;
-bool disable_multi_device_power_control = false;
-bool s_tuner_no_sleep = false;
-
-module_param(xfer_packets, uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
-MODULE_PARM_DESC(xfer_packets,
-		 "Number of transfer packets from the device. (default: 816)");
-
-module_param(urb_max_packets, uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
-MODULE_PARM_DESC(urb_max_packets,
-		 "Maximum number of TS packets per URB. (default: 816)");
-
-module_param(max_urbs, uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
-MODULE_PARM_DESC(max_urbs, "Maximum number of URBs. (default: 6)");
-
-module_param(tsdev_max_packets, uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
-MODULE_PARM_DESC(tsdev_max_packets,
-		 "Maximum number of TS packets buffering in tsdev. (default: 2048)");
-
-module_param(psb_purge_timeout, int, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
-
-module_param(no_dma, bool, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
-
-module_param(disable_multi_device_power_control, bool,
-	     S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
-
-module_param(s_tuner_no_sleep, bool, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);

driver/module_param.h

@@ -1,17 +0,0 @@
-// module_param.h
-
-#ifndef __MODULE_PARAM_H__
-#define __MODULE_PARAM_H__
-
-#include <linux/types.h>
-
-extern unsigned int xfer_packets;
-extern unsigned int urb_max_packets;
-extern unsigned int max_urbs;
-extern unsigned int tsdev_max_packets;
-extern int psb_purge_timeout;
-extern bool no_dma;
-extern bool disable_multi_device_power_control;
-extern bool s_tuner_no_sleep;
-
-#endif

driver/ptx_chrdev.c

@@ -0,0 +1,963 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Character device operator for PTX devices (ptx_chrdev.c)
+ *
+ * Copyright (c) 2018-2020 nns779
+ */
+
+#include "print_format.h"
+#include "ptx_chrdev.h"
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/uaccess.h>
+#include <linux/fs.h>
+
+static LIST_HEAD(ctx_list);
+static DEFINE_MUTEX(ctx_list_lock);
+
+static bool __ptx_chrdev_search_context(unsigned int major,
+					struct ptx_chrdev_context **chrdev_ctx);
+static bool __ptx_chrdev_context_search_group(struct ptx_chrdev_context *chrdev_ctx,
+					      unsigned int minor,
+					      struct ptx_chrdev_group **chrdev_group);
+static void ptx_chrdev_group_release(struct kref *kref);
+static void ptx_chrdev_context_release(struct kref *kref);
+
+static int ptx_chrdev_open(struct inode *inode, struct file *file)
+{
+	int ret = 0;
+	unsigned int major, minor;
+	struct ptx_chrdev_context *ctx;
+	struct ptx_chrdev_group *group;
+	struct ptx_chrdev *chrdev = NULL;
+
+	major = imajor(inode);
+	minor = iminor(inode);
+
+	mutex_lock(&ctx_list_lock);
+
+	if (!__ptx_chrdev_search_context(major, &ctx)) {
+		mutex_unlock(&ctx_list_lock);
+		ret = -ENOENT;
+		goto fail;
+	}
+
+	kref_get(&ctx->kref);
+	mutex_lock(&ctx->lock);
+	mutex_unlock(&ctx_list_lock);
+
+	if (!__ptx_chrdev_context_search_group(ctx, minor, &group)) {
+		mutex_unlock(&ctx->lock);
+		ret = -ENOENT;
+		goto fail_ctx;
+	}
+
+	kref_get(&group->kref);
+	mutex_lock(&group->lock);
+	mutex_unlock(&ctx->lock);
+
+	if (!atomic_read(&group->available)) {
+		mutex_unlock(&group->lock);
+		ret = -ENOENT;
+		goto fail_group;
+	}
+
+	chrdev = &group->chrdev[minor - group->minor_base];
+
+	ret = (atomic_cmpxchg(&chrdev->open, 0, 1)) ? -EALREADY : 0;
+	if (ret) {
+		mutex_unlock(&group->lock);
+		goto fail_group;
+	}
+
+	mutex_lock(&chrdev->lock);
+	mutex_unlock(&group->lock);
+
+	if (chrdev->ops && chrdev->ops->open)
+		ret = chrdev->ops->open(chrdev);
+
+	if (!ret)
+		file->private_data = chrdev;
+
+	mutex_unlock(&chrdev->lock);
+
+	if (ret)
+		goto fail_chrdev;
+
+	return 0;
+
+fail_chrdev:
+	atomic_dec_return(&chrdev->open);
+fail_group:
+	kref_put(&group->kref, ptx_chrdev_group_release);
+fail_ctx:
+	kref_put(&ctx->kref, ptx_chrdev_context_release);
+fail:
+	return ret;
+}
+
+static ssize_t ptx_chrdev_read(struct file *file,
+			       char __user *buf, size_t count, loff_t *ppos)
+{
+	int ret = 0;
+	struct ptx_chrdev *chrdev = file->private_data;
+	struct ptx_chrdev_group *group = chrdev->parent;
+	u8 __user *p = buf;
+	size_t remain = count;
+
+	if (!atomic_read_acquire(&group->available))
+		return -EIO;
+
+	ringbuffer_ready_read(chrdev->ringbuf);
+
+	while (remain) {
+		size_t len;
+
+		if (wait_event_interruptible(chrdev->ringbuf_wait,
+					     ringbuffer_is_readable(chrdev->ringbuf) ||
+					     !ringbuffer_is_running(chrdev->ringbuf) ||
+					     !atomic_read(&group->available))) {
+			if (remain == count)
+				ret = -EINTR;
+
+			break;
+		}
+
+		len = remain;
+		ret = ringbuffer_read_user(chrdev->ringbuf, p, &len);
+		if (ret || !len)
+			break;
+
+		p += len;
+		remain -= len;
+	}
+
+	return (ret < 0) ? ret : (count - remain);
+}
+
+static int ptx_chrdev_release(struct inode *inode, struct file *file)
+{
+	int ret = 0;
+	struct ptx_chrdev *chrdev = file->private_data;
+
+	mutex_lock(&chrdev->lock);
+
+	if (chrdev->streaming) {
+		if (chrdev->ops && chrdev->ops->set_capture)
+			chrdev->ops->set_capture(chrdev, false);
+
+		ringbuffer_stop(chrdev->ringbuf);
+		wake_up(&chrdev->ringbuf_wait);
+		chrdev->streaming = false;
+	}
+
+	if (chrdev->ops && chrdev->ops->release)
+		ret = chrdev->ops->release(chrdev);
+
+	mutex_unlock(&chrdev->lock);
+
+	atomic_dec_return(&chrdev->open);
+	kref_put(&chrdev->parent->kref, ptx_chrdev_group_release);
+	kref_put(&chrdev->parent->parent->kref, ptx_chrdev_context_release);
+
+	return ret;
+}
+
+static long ptx_chrdev_unlocked_ioctl(struct file *file,
+				      unsigned int cmd, unsigned long arg)
+{
+	int ret = 0;
+	struct ptx_chrdev *chrdev = file->private_data;
+	struct ptx_chrdev_group *group = chrdev->parent;
+
+	if (!atomic_read_acquire(&group->available))
+		return -EIO;
+
+	mutex_lock(&chrdev->lock);
+
+	switch (cmd) {
+	case PTX_SET_CHANNEL:
+	{
+		struct ptx_freq freq;
+		enum ptx_system_type system;
+
+		if (!chrdev->ops || !chrdev->ops->tune) {
+			ret = -ENOSYS;
+			break;
+		}
+
+		if (copy_from_user(&freq, (void *)arg, sizeof(freq))) {
+			ret = -EFAULT;
+			break;
+		}
+
+		system = chrdev->params.system;
+
+		switch (chrdev->params.system) {
+		case PTX_ISDB_S_SYSTEM:
+			if (freq.freq_no < 0) {
+				ret = -EINVAL;
+				break;
+			} else if (freq.freq_no < 12) {
+				// BS
+				if (freq.slot >= 8) {
+					ret = -EINVAL;
+					break;
+				}
+				chrdev->params.freq = 1049480 + (38360 * freq.freq_no);
+			} else if (freq.freq_no < 24) {
+				// CS
+				chrdev->params.freq = 1613000 + (40000 * (freq.freq_no - 12));
+			} else {
+				ret = -EINVAL;
+				break;
+			}
+			chrdev->params.bandwidth = 0;
+			chrdev->params.stream_id = freq.slot;
+			break;
+
+		case PTX_ISDB_T_SYSTEM:
+			if ((freq.freq_no >= 3 && freq.freq_no <= 12) ||
+			    (freq.freq_no >= 22 && freq.freq_no <= 62)) {
+				// CATV C13-C22ch, C23-63ch
+				chrdev->params.freq = 93143 + freq.freq_no * 6000 + freq.slot/* addfreq */;
+
+				if (freq.freq_no == 12)
+					chrdev->params.freq += 2000;
+			} else if (freq.freq_no >= 63 && freq.freq_no <= 102) {
+				// UHF 13-52ch
+				chrdev->params.freq = 95143 + freq.freq_no * 6000 + freq.slot/* addfreq */;
+			} else {
+				// Unknown channel
+				ret = -EINVAL;
+				break;
+			}
+			chrdev->params.bandwidth = 6;
+			chrdev->params.stream_id = 0;
+			break;
+
+		case PTX_UNSPECIFIED_SYSTEM:
+			if (chrdev->system_cap & PTX_ISDB_S_SYSTEM) {
+				if (freq.freq_no < 0) {
+					ret = -EINVAL;
+					break;
+				} else if (freq.freq_no < 12) {
+					// BS
+					if (freq.slot >= 8) {
+						ret = -EINVAL;
+						break;
+					}
+					chrdev->params.freq = 1049480 + (38360 * freq.freq_no);
+				} else if (freq.freq_no < 24) {
+					// CS
+					chrdev->params.freq = 1613000 + (40000 * (freq.freq_no - 12));
+
+				} else {
+					ret = -EINVAL;
+					break;
+				}
+				chrdev->params.bandwidth = 0;
+				chrdev->params.stream_id = freq.slot;
+				chrdev->params.system = PTX_ISDB_S_SYSTEM;
+			} else if (chrdev->system_cap & PTX_ISDB_T_SYSTEM) {
+				if (freq.freq_no >= 63 && freq.freq_no <= 102) {
+					// UHF 13-52ch
+					chrdev->params.freq = 95143 + freq.freq_no * 6000 + freq.slot/* addfreq */;
+					chrdev->params.bandwidth = 6;
+					chrdev->params.stream_id = 0;
+					chrdev->params.system = PTX_ISDB_T_SYSTEM;
+				} else {
+					ret = -EINVAL;
+					break;
+				}
+			} else {
+				ret = -EINVAL;
+				break;
+			}
+			break;
+
+		default:
+			ret = -ENOSYS;
+			break;
+		}
+
+		if (ret)
+			break;
+
+		ret = chrdev->ops->tune(chrdev, &chrdev->params);
+		if (ret) {
+			chrdev->params.system = system;
+			break;
+		}
+
+		chrdev->current_system = chrdev->params.system;
+		chrdev->params.system = system;
+
+		if (chrdev->ops->check_lock) {
+			int i;
+			bool locked = false;
+
+			i = 300;
+			while (i--) {
+				ret = chrdev->ops->check_lock(chrdev, &locked);
+				if (!ret && locked)
+					break;
+
+				msleep(10);
+			}
+
+			if (!locked) {
+				ret = -EAGAIN;
+				break;
+			}
+		}
+
+		if (chrdev->current_system == PTX_ISDB_S_SYSTEM &&
+		    chrdev->ops->set_stream_id)
+			ret = chrdev->ops->set_stream_id(chrdev,
+							 chrdev->params.stream_id);
+
+		break;
+	}
+
+	case PTX_START_STREAMING:
+		if (chrdev->streaming) {
+			ret = -EALREADY;
+			break;
+		}
+
+		chrdev->ringbuf_write_size = 0;
+
+		if (chrdev->ops && chrdev->ops->set_capture)
+			ret = chrdev->ops->set_capture(chrdev, true);
+		else
+			ret = -ENOSYS;
+
+		if (!ret) {
+			ringbuffer_reset(chrdev->ringbuf);
+			ringbuffer_start(chrdev->ringbuf);
+			chrdev->streaming = true;
+		}
+
+		break;
+
+	case PTX_STOP_STREAMING:
+		if (!chrdev->streaming) {
+			ret = -EALREADY;
+			break;
+		}
+
+		if (chrdev->ops && chrdev->ops->set_capture)
+			ret = chrdev->ops->set_capture(chrdev, false);
+		else
+			ret = -ENOSYS;
+
+		if (!ret) {
+			ringbuffer_stop(chrdev->ringbuf);
+			wake_up(&chrdev->ringbuf_wait);
+			chrdev->streaming = false;
+		}
+
+		break;
+
+	case PTX_GET_CNR:
+	{
+		u32 cn = 0;
+
+		if (chrdev->ops && chrdev->ops->read_cnr_raw)
+			ret = chrdev->ops->read_cnr_raw(chrdev, &cn);
+		else
+			ret = -ENOSYS;
+
+		if (ret)
+			break;
+
+		if (copy_to_user((void *)arg, &cn, sizeof(cn)))
+			ret = -EFAULT;
+
+		break;
+	}
+
+	case PTX_ENABLE_LNB_POWER:
+		if (chrdev->ops && chrdev->ops->set_lnb_voltage)
+			ret = chrdev->ops->set_lnb_voltage(chrdev, (int)arg);
+		else
+			ret = -ENOSYS;
+		break;
+
+	case PTX_DISABLE_LNB_POWER:
+		if (chrdev->ops && chrdev->ops->set_lnb_voltage)
+			ret = chrdev->ops->set_lnb_voltage(chrdev, 0);
+		else
+			ret = -ENOSYS;
+		break;
+
+	case PTX_SET_SYSTEM_MODE:
+	{
+		enum ptx_system_type mode = (enum ptx_system_type)arg;
+
+		switch (mode) {
+		case PTX_UNSPECIFIED_SYSTEM:
+		case PTX_ISDB_T_SYSTEM:
+		case PTX_ISDB_S_SYSTEM:
+			if (chrdev->system_cap & mode)
+				chrdev->params.system = mode;
+			else
+				ret = -EINVAL;
+			break;
+
+		default:
+			ret = -EINVAL;
+			break;
+		}
+
+		break;
+	}
+
+#if 0
+	case PTXT_GET_INFO:
+		break;
+
+	case PTXT_GET_PARAMS:
+		break;
+
+	case PTXT_SET_PARAMS:
+		break;
+
+	case PTXT_CLEAR_PARAMS:
+		break;
+
+	case PTXT_TUNE:
+		break;
+
+	case PTXT_SET_LNB_VOLTAGE:
+		break;
+
+	case PTXT_SET_CAPTURE:
+		break;
+
+	case PTXT_READ_STATS:
+		break;
+#endif
+
+	default:
+		ret = -ENOSYS;
+		break;
+	}
+
+	mutex_unlock(&chrdev->lock);
+	return ret;
+}
+
+static struct file_operations ptx_chrdev_fops = {
+	.owner = THIS_MODULE,
+	.open = ptx_chrdev_open,
+	.read = ptx_chrdev_read,
+	.release = ptx_chrdev_release,
+	.unlocked_ioctl = ptx_chrdev_unlocked_ioctl
+};
+
+static bool __ptx_chrdev_search_context(unsigned int major,
+					struct ptx_chrdev_context **chrdev_ctx)
+{
+	struct ptx_chrdev_context *ctx;
+
+	*chrdev_ctx = NULL;
+
+	list_for_each_entry(ctx, &ctx_list, list) {
+		if (MAJOR(ctx->dev_base) != major)
+			continue;
+
+		*chrdev_ctx = ctx;
+		break;
+	}
+
+	return (*chrdev_ctx) ? true : false;
+}
+
+int ptx_chrdev_context_create(const char *name, const char *devname,
+			      unsigned int total_num,
+			      struct ptx_chrdev_context **chrdev_ctx)
+{
+	int ret = 0;
+	struct ptx_chrdev_context *ctx;
+
+	if (!name || !devname || !total_num || !chrdev_ctx)
+		return -EINVAL;
+
+	ctx = kzalloc(sizeof(*ctx) + (sizeof(*ctx->minor_table) * total_num),
+		      GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	mutex_init(&ctx->lock);
+	strlcpy(ctx->devname, devname, sizeof(ctx->devname));
+
+	INIT_LIST_HEAD(&ctx->group_list);
+
+	ctx->class = class_create(THIS_MODULE, name);
+	if (IS_ERR(ctx->class)) {
+		pr_err("ptx_chrdev_context_create: class_create(\"%s\") failed.\n",
+		       name);
+		kfree(ctx);
+		return PTR_ERR(ctx->class);
+	}
+
+	ret = alloc_chrdev_region(&ctx->dev_base, 0, total_num, name);
+	if (ret < 0) {
+		pr_err("ptx_chrdev_context_create: alloc_chrdev_region(\"%s\") failed.\n",
+		       name);
+		class_destroy(ctx->class);
+		kfree(ctx);
+		return ret;
+	}
+
+	kref_init(&ctx->kref);
+	ctx->last_id = 0;
+	ctx->minor_num = total_num;
+	ctx->minor_table = ((u8 *)ctx) + sizeof(*ctx);
+
+	mutex_lock(&ctx_list_lock);
+	list_add_tail(&ctx->list, &ctx_list);
+	mutex_unlock(&ctx_list_lock);
+
+	*chrdev_ctx = ctx;
+
+	return 0;
+}
+
+static void ptx_chrdev_context_release(struct kref *kref)
+{
+	struct ptx_chrdev_context *ctx = container_of(kref,
+						      struct ptx_chrdev_context,
+						      kref);
+
+	pr_debug("ptx_chrdev_context_release\n");
+
+	unregister_chrdev_region(ctx->dev_base, ctx->minor_num);
+	class_destroy(ctx->class);
+	mutex_destroy(&ctx->lock);
+	kfree(ctx);
+
+	return;
+}
+
+void ptx_chrdev_context_destroy(struct ptx_chrdev_context *chrdev_ctx)
+{
+	struct ptx_chrdev_group *group, *tmp_group;
+
+	mutex_lock(&ctx_list_lock);
+	list_del(&chrdev_ctx->list);
+	mutex_unlock(&ctx_list_lock);
+
+	mutex_lock(&chrdev_ctx->lock);
+	list_for_each_entry_safe(group, tmp_group,
+				 &chrdev_ctx->group_list, list) {
+		ptx_chrdev_group_destroy(group);
+	}
+	mutex_unlock(&chrdev_ctx->lock);
+
+	kref_put(&chrdev_ctx->kref, ptx_chrdev_context_release);
+	return;
+}
+
+static bool __ptx_chrdev_context_search_group(struct ptx_chrdev_context *chrdev_ctx,
+					      unsigned int minor,
+					      struct ptx_chrdev_group **chrdev_group)
+{
+	struct ptx_chrdev_group *group;
+
+	*chrdev_group = NULL;
+
+	list_for_each_entry(group, &chrdev_ctx->group_list, list) {
+		if (group->minor_base > minor ||
+		    minor >= (group->minor_base + group->chrdev_num))
+			continue;
+
+		*chrdev_group = group;
+		break;
+	}
+
+	return (*chrdev_group) ? true : false;
+}
+
+static int __ptx_chrdev_context_search_minor(struct ptx_chrdev_context *chrdev_ctx,
+					     unsigned int num, u8 state,
+					     unsigned int *base)
+{
+	unsigned int i, j;
+
+	if (num > chrdev_ctx->minor_num)
+		return -EINVAL;
+
+	for (i = 0; i < (chrdev_ctx->minor_num - num + 1); i++) {
+		if (chrdev_ctx->minor_table[i] != state)
+			continue;
+
+		for (j = 1; j < num; j++) {
+			if (chrdev_ctx->minor_table[i + j] != state)
+				break;
+		}
+		if (j < num) {
+			i += j;
+			continue;
+		}
+
+		// found
+		*base = i;
+		return 0;
+	}
+
+	return -EBUSY;
+}
+
+static int __ptx_chrdev_context_check_minor_status(struct ptx_chrdev_context *chrdev_ctx,
+						   unsigned int base,
+						   unsigned int num,
+						   u8 state,bool *res)
+{
+	unsigned int i;
+
+	if ((base + num) > chrdev_ctx->minor_num)
+		return -EINVAL;
+
+	*res = true;
+
+	for (i = 0; i < num; i++) {
+		if (chrdev_ctx->minor_table[base + i] != state) {
+			*res = false;
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static int __ptx_chrdev_context_set_minor_status(struct ptx_chrdev_context *chrdev_ctx,
+						 unsigned int base,
+						 unsigned int num,
+						 u8 state)
+{
+	unsigned int i;
+
+	if ((base + num) > chrdev_ctx->minor_num)
+		return -EINVAL;
+
+	for (i = 0; i < num; i++)
+		chrdev_ctx->minor_table[base + i] = state;
+
+	return 0;
+}
+
+int ptx_chrdev_context_reserve(struct ptx_chrdev_context *chrdev_ctx,
+			       unsigned int num, unsigned int *minor_base)
+{
+	int ret = 0;
+	unsigned int base;
+
+	mutex_lock(&chrdev_ctx->lock);
+
+	ret = __ptx_chrdev_context_search_minor(chrdev_ctx, num,
+						PTX_CHRDEV_MINOR_FREE, &base);
+	if (ret)
+		goto exit;
+
+	__ptx_chrdev_context_set_minor_status(chrdev_ctx, base, num,
+					      PTX_CHRDEV_MINOR_RESERVED);
+	*minor_base = MINOR(chrdev_ctx->dev_base) + base;
+
+exit:
+	mutex_unlock(&chrdev_ctx->lock);
+	return ret;
+}
+
+int ptx_chrdev_context_add_group(struct ptx_chrdev_context *chrdev_ctx,
+				 struct device *dev,
+				 const struct ptx_chrdev_group_config *config,
+				 struct ptx_chrdev_group **chrdev_group)
+{
+	int ret = 0;
+	unsigned int i, num, base;
+	struct ptx_chrdev_group *group = NULL;
+
+	if (!chrdev_ctx || !dev || !config)
+		return -EINVAL;
+
+	num = config->chrdev_num;
+
+	kref_get(&chrdev_ctx->kref);
+	mutex_lock(&chrdev_ctx->lock);
+
+	if (config->reserved) {
+		bool res;
+
+		base = config->minor_base - MINOR(chrdev_ctx->dev_base);
+		ret = __ptx_chrdev_context_check_minor_status(chrdev_ctx,
+							      base, num,
+							      PTX_CHRDEV_MINOR_RESERVED,
+							      &res);
+		if (!ret && !res)
+			ret = -EINVAL;
+	} else {
+		ret = __ptx_chrdev_context_search_minor(chrdev_ctx, num,
+							PTX_CHRDEV_MINOR_FREE,
+							&base);
+		if (ret)
+			dev_err(dev,
+				"ptx_chrdev_context_add: no enough minor number%s.\n",
+				(num == 1) ? "" : "s");
+		else
+			__ptx_chrdev_context_set_minor_status(chrdev_ctx,
+							      base, num,
+							      PTX_CHRDEV_MINOR_RESERVED);
+	}
+
+	if (ret)
+		goto fail;
+
+	__ptx_chrdev_context_set_minor_status(chrdev_ctx,
+					      base, num,
+					      PTX_CHRDEV_MINOR_IN_USE);
+
+	group = kzalloc(sizeof(*group) + (sizeof(group->chrdev[0]) * (num - 1)),
+			GFP_KERNEL);
+	if (!group) {
+		ret = -ENOMEM;
+		goto fail_group;
+	}
+
+	mutex_init(&group->lock);
+	atomic_set(&group->available, 1);
+	group->parent = chrdev_ctx;
+	group->dev = dev;
+	group->minor_base = MINOR(chrdev_ctx->dev_base) + base;
+	group->chrdev_num = 0;
+
+	for (i = 0; i < num; i++) {
+		struct ptx_chrdev *chrdev = &group->chrdev[i];
+		const struct ptx_chrdev_config *chrdev_config = &config->chrdev_config[i];
+
+		mutex_init(&chrdev->lock);
+		atomic_set(&chrdev->open, 0);
+		chrdev->system_cap = chrdev_config->system_cap;
+		chrdev->current_system = PTX_UNSPECIFIED_SYSTEM;
+		chrdev->ops = chrdev_config->ops;
+		chrdev->parent = group;
+		memset(&chrdev->params, 0, sizeof(chrdev->params));
+		chrdev->streaming = false;
+		init_waitqueue_head(&chrdev->ringbuf_wait);
+		chrdev->ringbuf_threshold_size = chrdev_config->ringbuf_size / 8;
+		chrdev->ringbuf_write_size = 0;
+		chrdev->priv = chrdev_config->priv;
+
+		ret = ringbuffer_create(&chrdev->ringbuf);
+		if (ret) {
+			mutex_destroy(&chrdev->lock);
+			dev_err(dev,
+				"ptx_chrdev_context_add: ringbuffer_create() failed. (ret: %d)\n",
+				ret);
+			break;
+		}
+
+		ret = ringbuffer_alloc(chrdev->ringbuf,
+				       chrdev_config->ringbuf_size);
+		if (ret) {
+			ringbuffer_destroy(chrdev->ringbuf);
+			mutex_destroy(&chrdev->lock);
+			dev_err(dev,
+				"ptx_chrdev_context_add: ringbuffer_alloc(%zu) failed. (ret: %d)\n",
+				chrdev_config->ringbuf_size, ret);
+			break;
+		}
+
+		if (chrdev->ops->init) {
+			ret = chrdev->ops->init(chrdev);
+			if (ret) {
+				ringbuffer_destroy(chrdev->ringbuf);
+				mutex_destroy(&chrdev->lock);
+				dev_err(dev,
+					"ptx_chrdev_context_add: chrdev->ops->init(%u) failed. (ret: %d)\n",
+					i, ret);
+				break;
+			}
+		}
+
+		chrdev->id = i;
+		group->chrdev_num++;
+	}
+
+	if (ret)
+		goto fail_chrdev;
+
+	cdev_init(&group->cdev, &ptx_chrdev_fops);
+	group->cdev.owner = THIS_MODULE;
+
+	ret = cdev_add(&group->cdev,
+		       MKDEV(MAJOR(chrdev_ctx->dev_base), group->minor_base),
+		       num);
+	if (ret < 0) {
+		dev_err(dev,
+			"ptx_chrdev_context_add: cdev_add() failed. (ret: %d)\n",
+			ret);
+		goto fail_chrdev;
+	}
+
+	for (i = 0; i < num; i++) {
+		dev_info(dev, "/dev/%s%u\n", chrdev_ctx->devname, base + i);
+		device_create(chrdev_ctx->class, dev,
+			      MKDEV(MAJOR(chrdev_ctx->dev_base),
+				    group->minor_base + i),
+			      NULL, "%s%u", chrdev_ctx->devname, base + i);
+	}
+
+	kref_init(&group->kref);
+	group->id = chrdev_ctx->last_id++;
+
+	list_add_tail(&group->list, &chrdev_ctx->group_list);
+	mutex_unlock(&chrdev_ctx->lock);
+
+	if (chrdev_group)
+		*chrdev_group = group;
+
+	return 0;
+
+fail_chrdev:
+	if (group) {
+		for (i = 0; i < group->chrdev_num; i++) {
+			struct ptx_chrdev *chrdev = &group->chrdev[i];
+
+			if (chrdev->ops->term)
+				chrdev->ops->term(chrdev);
+
+			ringbuffer_destroy(chrdev->ringbuf);
+			mutex_destroy(&chrdev->lock);
+		}
+
+		mutex_destroy(&group->lock);
+		kfree(group);
+	}
+
+fail_group:
+	__ptx_chrdev_context_set_minor_status(chrdev_ctx,
+					      base, num,
+					      (config->reserved) ? PTX_CHRDEV_MINOR_RESERVED : PTX_CHRDEV_MINOR_FREE);
+
+fail:
+	mutex_unlock(&chrdev_ctx->lock);
+	kref_put(&chrdev_ctx->kref, ptx_chrdev_context_release);
+
+	return ret;
+}
+
+int ptx_chrdev_context_remove_group(struct ptx_chrdev_context *chrdev_ctx,
+				    unsigned int minor_base)
+{
+	int ret = 0;
+	struct ptx_chrdev_group *group;
+
+	mutex_lock(&chrdev_ctx->lock);
+
+	if (!__ptx_chrdev_context_search_group(chrdev_ctx,
+					       minor_base, &group)) {
+		// not found
+		ret = -ENOENT;
+		goto exit;
+	}
+
+	ptx_chrdev_group_destroy(group);
+
+exit:
+	mutex_unlock(&chrdev_ctx->lock);
+	return ret;
+}
+
+static void ptx_chrdev_group_release(struct kref *kref)
+{
+	struct ptx_chrdev_group *group = container_of(kref,
+						      struct ptx_chrdev_group,
+						      kref);
+	struct ptx_chrdev_context *ctx = group->parent;
+	unsigned int i, minor_base, num;
+
+	dev_dbg(group->dev, "ptx_chrdev_group_release\n");
+
+	minor_base = group->minor_base;
+	num = group->chrdev_num;
+
+	for (i = 0; i < num; i++) {
+		struct ptx_chrdev *chrdev = &group->chrdev[i];
+
+		if (chrdev->ops->term)
+			chrdev->ops->term(chrdev);
+
+		ringbuffer_destroy(chrdev->ringbuf);
+		mutex_destroy(&chrdev->lock);
+	}
+
+	mutex_destroy(&group->lock);
+	kfree(group);
+
+	mutex_lock(&ctx->lock);
+	__ptx_chrdev_context_set_minor_status(ctx,
+					      minor_base - MINOR(ctx->dev_base),
+					      num,
+					      PTX_CHRDEV_MINOR_FREE);
+	mutex_unlock(&ctx->lock);
+
+	kref_put(&ctx->kref, ptx_chrdev_context_release);
+
+	return;
+}
+
+void ptx_chrdev_group_destroy(struct ptx_chrdev_group *chrdev_group)
+{
+	struct ptx_chrdev_context *ctx = chrdev_group->parent;
+	unsigned int i;
+
+	dev_dbg(chrdev_group->dev,
+		"ptx_chrdev_group_destroy: kref count: %u\n",
+		kref_read(&chrdev_group->kref));
+
+	mutex_lock(&ctx->lock);
+	list_del(&chrdev_group->list);
+	mutex_unlock(&ctx->lock);
+
+	mutex_lock(&chrdev_group->lock);
+
+	atomic_xchg(&chrdev_group->available, 0);
+
+	for (i = 0; i < chrdev_group->chrdev_num; i++) {
+		wake_up(&chrdev_group->chrdev[i].ringbuf_wait);
+		device_destroy(ctx->class,
+			       MKDEV(MAJOR(ctx->dev_base),
+				     chrdev_group->minor_base + i));
+	}
+
+	cdev_del(&chrdev_group->cdev);
+
+	mutex_unlock(&chrdev_group->lock);
+	kref_put(&chrdev_group->kref, ptx_chrdev_group_release);
+
+	return;
+}
+
+int ptx_chrdev_put_stream(struct ptx_chrdev *chrdev, void *buf, size_t len)
+{
+	int ret = 0;
+
+	ret = ringbuffer_write_atomic(chrdev->ringbuf, buf, &len);
+	if (ret && ret != -EOVERFLOW)
+		return ret;
+
+	chrdev->ringbuf_write_size += len;
+
+	if (chrdev->ringbuf_write_size >= chrdev->ringbuf_threshold_size) {
+		wake_up(&chrdev->ringbuf_wait);
+		chrdev->ringbuf_write_size -= chrdev->ringbuf_threshold_size;
+	}
+
+	return 0;
+}

driver/ptx_chrdev.h

@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Character device operator definitions for PTX devices (ptx_chrdev.h)
+ *
+ * Copyright (c) 2018-2020 nns779
+ */
+
+#ifndef __PTX_CHRDEV__
+#define __PTX_CHRDEV__
+
+#include <linux/types.h>
+#include <linux/atomic.h>
+#include <linux/kref.h>
+#include <linux/mutex.h>
+#include <linux/wait.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+
+#include "ptx_ioctl.h"
+#include "ringbuffer.h"
+
+struct ptx_tune_params {
+	enum ptx_system_type system;
+	u32 freq;
+	u32 bandwidth;
+	u16 stream_id;
+};
+
+struct ptx_chrdev;
+struct ptx_chrdev_group;
+struct ptx_chrdev_context;
+
+struct ptx_chrdev_operations {
+	int (*init)(struct ptx_chrdev *chrdev);
+	int (*term)(struct ptx_chrdev *chrdev);
+	int (*open)(struct ptx_chrdev *chrdev);
+	int (*release)(struct ptx_chrdev *chrdev);
+	int (*tune)(struct ptx_chrdev *chrdev, struct ptx_tune_params *params);
+	int (*check_lock)(struct ptx_chrdev *chrdev, bool *locked);
+	int (*set_stream_id)(struct ptx_chrdev *chrdev, u16 stream_id);
+	int (*set_lnb_voltage)(struct ptx_chrdev *chrdev, int voltage);
+	int (*set_capture)(struct ptx_chrdev *chrdev, bool status);
+	int (*read_signal_strength)(struct ptx_chrdev *chrdev, u32 *value);
+	int (*read_cnr)(struct ptx_chrdev *chrdev, u32 *value);
+	int (*read_cnr_raw)(struct ptx_chrdev *chrdev, u32 *value);
+};
+
+struct ptx_chrdev_config {
+	enum ptx_system_type system_cap;
+	const struct ptx_chrdev_operations *ops;
+	size_t ringbuf_size;
+	void *priv;
+};
+
+struct ptx_chrdev_group_config {
+	bool reserved;
+	unsigned int minor_base;
+	unsigned int chrdev_num;
+	struct ptx_chrdev_config *chrdev_config;
+};
+
+struct ptx_chrdev {
+	struct mutex lock;
+	unsigned int id;
+	atomic_t open;
+	char name[64];
+	enum ptx_system_type system_cap;
+	enum ptx_system_type current_system;
+	const struct ptx_chrdev_operations *ops;
+	struct ptx_chrdev_group *parent;
+	struct ptx_tune_params params;
+	bool streaming;
+	struct ringbuffer *ringbuf;
+	wait_queue_head_t ringbuf_wait;
+	size_t ringbuf_threshold_size;
+	size_t ringbuf_write_size;
+	void *priv;
+};
+
+struct ptx_chrdev_group {
+	struct list_head list;
+	struct mutex lock;
+	struct kref kref;
+	unsigned int id;
+	atomic_t available;
+	struct ptx_chrdev_context *parent;
+	struct device *dev;
+	struct cdev cdev;
+	unsigned int minor_base;
+	unsigned int chrdev_num;
+	struct ptx_chrdev chrdev[1];
+};
+
+#define PTX_CHRDEV_MINOR_FREE		0
+#define PTX_CHRDEV_MINOR_RESERVED	1
+#define PTX_CHRDEV_MINOR_IN_USE		2
+
+struct ptx_chrdev_context {
+	struct list_head list;
+	struct mutex lock;
+	struct kref kref;
+	char devname[64];
+	struct class *class;
+	dev_t dev_base;
+	unsigned int last_id;
+	unsigned int minor_num;
+	u8 *minor_table;
+	struct list_head group_list;
+};
+
+int ptx_chrdev_context_create(const char *name, const char *devname,
+			      unsigned int total_num,
+			      struct ptx_chrdev_context **chrdev_ctx);
+void ptx_chrdev_context_destroy(struct ptx_chrdev_context *chrdev_ctx);
+int ptx_chrdev_context_add_group(struct ptx_chrdev_context *chrdev_ctx,
+				 struct device *dev,
+				 const struct ptx_chrdev_group_config *config,
+				 struct ptx_chrdev_group **chrdev_group);
+int ptx_chrdev_context_remove_group(struct ptx_chrdev_context *chrdev_ctx,
+				    unsigned int minor_base);
+void ptx_chrdev_group_destroy(struct ptx_chrdev_group *chrdev_group);
+int ptx_chrdev_put_stream(struct ptx_chrdev *chrdev, void *buf, size_t len);
+
+#endif

driver/px4.h

@@ -1,9 +0,0 @@
-// px4.h
-
-#ifndef __PX4_H__
-#define __PX4_H__
-
-int px4_register(void);
-void px4_unregister(void);
-
-#endif

driver/px4_device.h

@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PTX driver definitions for PLEX PX4/PX5 series devices (px4_device.h)
+ *
+ * Copyright (c) 2018-2020 nns779
+ */
+
+#ifndef __PX4_DEVICE_H__
+#define __PX4_DEVICE_H__
+
+#include <linux/types.h>
+#include <linux/atomic.h>
+#include <linux/kref.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+
+#include "px4_mldev.h"
+#include "ptx_chrdev.h"
+#include "it930x.h"
+#include "tc90522.h"
+#include "r850.h"
+#include "rt710.h"
+
+#define PX4_CHRDEV_NUM			4
+
+struct px4_device;
+
+struct px4_chrdev {
+	struct ptx_chrdev *chrdev;
+	struct px4_device *parent;
+	bool lnb_power;
+	struct tc90522_demod tc90522;
+	union {
+		struct r850_tuner r850;
+		struct rt710_tuner rt710;
+	} tuner;
+};
+
+struct px4_serial_number {
+	unsigned long long serial_number;
+	unsigned int dev_id;
+};
+
+struct px4_device {
+	struct mutex lock;
+	struct kref kref;
+	atomic_t available;
+	struct device *dev;
+	struct px4_serial_number serial;
+	struct px4_mldev *mldev;
+	unsigned int open_count;
+	unsigned int lnb_power_count;
+	unsigned int streaming_count;
+	struct ptx_chrdev_group *chrdev_group;
+	struct px4_chrdev chrdev4[PX4_CHRDEV_NUM];
+	struct it930x_bridge it930x;
+	void *stream_ctx;
+};
+
+int px4_device_init(struct px4_device *px4, struct device *dev,
+		    const char *dev_serial, bool use_mldev,
+		    struct ptx_chrdev_context *chrdev_ctx);
+void px4_device_term(struct px4_device *px4);
+
+#endif

driver/px4_device_params.c

@@ -0,0 +1,33 @@
+// SPDX-Licence-Identifier: GPL-2.0-only
+/*
+ * Module parameter definitions (px4_device_params.c)
+ *
+ * Copyright (c) 2018-2020 nns779
+ */
+
+#include "px4_device_params.h"
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+struct px4_device_param_set px4_device_params = {
+	.tsdev_max_packets = 2048,
+	.psb_purge_timeout = 2000,
+	.disable_multi_device_power_control = false,
+	.s_tuner_no_sleep = false
+};
+
+module_param_named(tsdev_max_packets, px4_device_params.tsdev_max_packets,
+		   uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+MODULE_PARM_DESC(tsdev_max_packets,
+		 "Maximum number of TS packets buffering in tsdev. (default: 2048)");
+
+module_param_named(psb_purge_timeout, px4_device_params.psb_purge_timeout,
+		   int, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+
+module_param_named(disable_multi_device_power_control,
+		   px4_device_params.disable_multi_device_power_control,
+		   bool, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+
+module_param_named(s_tuner_no_sleep, px4_device_params.s_tuner_no_sleep,
+		   bool, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);

driver/px4_device_params.h

@@ -0,0 +1,17 @@
+// px4_device_params.h
+
+#ifndef __PX4_DEVICE_PARAMS_H__
+#define __PX4_DEVICE_PARAMS_H__
+
+#include <linux/types.h>
+
+struct px4_device_param_set {
+	unsigned int tsdev_max_packets;
+	int psb_purge_timeout;
+	bool disable_multi_device_power_control;
+	bool s_tuner_no_sleep;
+};
+
+extern struct px4_device_param_set px4_device_params;
+
+#endif

driver/px4_mldev.c

@@ -0,0 +1,210 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PX4 multi-device power manager (px4_mldev.c)
+ *
+ * Copyright (c) 2018-2020 nns779
+ */
+
+#include "print_format.h"
+#include "px4_mldev.h"
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+
+static LIST_HEAD(px4_mldev_list);
+static DEFINE_MUTEX(px4_mldev_glock);
+
+static unsigned int __px4_mldev_get_power_count(struct px4_mldev *mldev);
+
+bool px4_mldev_search(unsigned long long serial_number,
+		      struct px4_mldev **mldev)
+{
+	struct px4_mldev *m;
+
+	*mldev = NULL;
+
+	mutex_lock(&px4_mldev_glock);
+	list_for_each_entry(m, &px4_mldev_list, list) {
+		if (m->serial_number == serial_number) {
+			*mldev = m;
+			break;
+		}
+	}
+	mutex_unlock(&px4_mldev_glock);
+
+	return (*mldev) ? true : false;
+}
+
+int px4_mldev_alloc(struct px4_mldev **mldev, struct px4_device *px4,
+		    int (*backend_set_power)(struct px4_device *, bool))
+{
+	unsigned int dev_id = px4->serial.dev_id - 1;
+	struct px4_mldev *m;
+
+	dev_dbg(px4->dev,
+		"px4_mldev_alloc: serial_number: %014llu, dev_id: %u\n",
+		px4->serial.serial_number, px4->serial.dev_id);
+
+	if (dev_id > 1)
+		return -EINVAL;
+
+	m = kzalloc(sizeof(*m), GFP_KERNEL);
+	if (!m)
+		return -ENOMEM;
+
+	kref_init(&m->kref);
+	mutex_init(&m->lock);
+	m->serial_number = px4->serial.serial_number;
+	m->dev[px4->serial.dev_id - 1] = px4;
+	m->backend_set_power = backend_set_power;
+
+	mutex_lock(&px4_mldev_glock);
+	list_add_tail(&m->list, &px4_mldev_list);
+	mutex_unlock(&px4_mldev_glock);
+
+	*mldev = m;
+
+	return 0;
+}
+
+static void px4_mldev_release(struct kref *kref)
+{
+	struct px4_mldev *mldev = container_of(kref, struct px4_mldev, kref);
+
+	pr_debug("px4_mldev_release: serial_number: %014llu\n",
+		 mldev->serial_number);
+
+	mutex_lock(&px4_mldev_glock);
+	list_del(&mldev->list);
+	mutex_unlock(&px4_mldev_glock);
+
+	mutex_destroy(&mldev->lock);
+	kfree(mldev);
+
+	return;
+}
+
+int px4_mldev_add(struct px4_mldev *mldev, struct px4_device *px4)
+{
+	int ret = 0;
+	unsigned int dev_id = px4->serial.dev_id - 1;
+
+	dev_dbg(px4->dev,
+		"px4_mldev_add: serial_number: %014llu, dev_id: %u\n",
+		mldev->serial_number, dev_id + 1);
+
+	if (dev_id > 1)
+		return -EINVAL;
+
+	mutex_lock(&mldev->lock);
+
+	if (kref_read(&mldev->kref) >= 2) {
+		ret = -EINVAL;
+		goto exit;
+	}
+
+	if (mldev->dev[dev_id]) {
+		ret = -EALREADY;
+		goto exit;
+	}
+
+	if (__px4_mldev_get_power_count(mldev))
+		ret = mldev->backend_set_power(px4, true);
+
+	if (ret)
+		goto exit;
+
+	kref_get(&mldev->kref);
+	mldev->dev[dev_id] = px4;
+
+exit:
+	mutex_unlock(&mldev->lock);
+	return ret;
+}
+
+int px4_mldev_remove(struct px4_mldev *mldev, struct px4_device *px4)
+{
+	unsigned int dev_id = px4->serial.dev_id - 1;
+
+	dev_dbg(px4->dev,
+		"px4_mldev_remove: serial_number: %014llu, dev_id: %u\n",
+		mldev->serial_number, dev_id + 1);
+
+	if (dev_id > 1)
+		return -EINVAL;
+
+	mutex_lock(&mldev->lock);
+
+	if (mldev->dev[dev_id] != px4) {
+		mutex_unlock(&mldev->lock);
+		return -EINVAL;
+	}
+
+	if (__px4_mldev_get_power_count(mldev) && mldev->power_state[dev_id]) {
+		mldev->backend_set_power(px4, false);
+		mldev->power_state[dev_id] = false;
+	}
+
+	mldev->dev[dev_id] = NULL;
+
+	if (kref_put(&mldev->kref, px4_mldev_release))
+		return 0;
+
+	mutex_unlock(&mldev->lock);
+	return 0;
+}
+
+static unsigned int __px4_mldev_get_power_count(struct px4_mldev *mldev)
+{
+	return (!!mldev->power_state[0]) + (!!mldev->power_state[1]);
+}
+
+int px4_mldev_set_power(struct px4_mldev *mldev, struct px4_device *px4,
+			bool state)
+{
+	int ret = 0, i;
+	unsigned int dev_id = px4->serial.dev_id - 1;
+
+	dev_dbg(px4->dev,
+		"px4_mldev_set_power: serial_number: %014llu, dev_id: %u, state: %s\n",
+		mldev->serial_number, dev_id + 1, (state) ? "true" : "false");
+	dev_dbg(px4->dev,
+		"px4_mldev_set_power: power_state: %s, %s\n",
+		(mldev->power_state[0]) ? "true" : "false",
+		(mldev->power_state[1]) ? "true" : "false");
+
+	if (dev_id > 1)
+		return -EINVAL;
+
+	mutex_lock(&mldev->lock);
+
+	if (!mldev->dev[dev_id]) {
+		ret = -EINVAL;
+		goto exit;
+	}
+
+	if (mldev->power_state[dev_id] == state)
+		goto exit;
+
+	if (!state)
+		mldev->power_state[dev_id] = false;
+
+	if (!__px4_mldev_get_power_count(mldev)) {
+		for (i = 0; i < 2; i++) {
+			if (!mldev->dev[i])
+				continue;
+
+			ret = mldev->backend_set_power(mldev->dev[i], state);
+			if (ret)
+				break;
+		}
+	}
+
+	if (state && !ret)
+		mldev->power_state[dev_id] = true;
+
+exit:
+	mutex_unlock(&mldev->lock);
+	return ret;
+}

driver/px4_mldev.h

@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PX4 multi-device power manager definitions (px4_mldev.h)
+ *
+ * Copyright (c) 2018-2020 nns779
+ */
+
+#ifndef __PX4_MLDEV_H__
+#define __PX4_MLDEV_H__
+
+#include <linux/types.h>
+#include <linux/kref.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+
+#include "px4_device.h"
+
+struct px4_mldev {
+	struct kref kref;
+	struct list_head list;
+	struct mutex lock;
+	unsigned long long serial_number;
+	struct px4_device *dev[2];
+	bool power_state[2];
+	int (*backend_set_power)(struct px4_device *px4, bool state);
+};
+
+bool px4_mldev_search(unsigned long long serial_number,
+		      struct px4_mldev **mldev);
+int px4_mldev_alloc(struct px4_mldev **mldev, struct px4_device *px4,
+		    int (*backend_set_power)(struct px4_device *, bool));
+int px4_mldev_add(struct px4_mldev *mldev, struct px4_device *px4);
+int px4_mldev_remove(struct px4_mldev *mldev, struct px4_device *px4);
+int px4_mldev_set_power(struct px4_mldev *mldev, struct px4_device *px4,
+			bool state);
+
+#endif

driver/px4_usb.c

@@ -0,0 +1,256 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PTX driver for USB devices (px4_usb.c)
+ *
+ * Copyright (c) 2018-2020 nns779
+ */
+
+#include "print_format.h"
+#include "px4_usb.h"
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/usb.h>
+
+#include "px4_usb_params.h"
+#include "px4_device_params.h"
+#include "ptx_chrdev.h"
+#include "px4_device.h"
+#include "isdb2056_device.h"
+
+#define PX4_USB_MAX_DEVICE	16
+#define PX4_USB_MAX_CHRDEV	(PX4_USB_MAX_DEVICE * PX4_CHRDEV_NUM)
+
+#define ISDB2056_USB_MAX_DEVICE		64
+#define ISDB2056_USB_MAX_CHRDEV		(ISDB2056_USB_MAX_DEVICE * ISDB2056_CHRDEV_NUM)
+
+struct px4_usb_context {
+	struct list_head list;
+	enum px4_usb_device_type type;
+	union {
+		struct px4_device px4;
+		struct isdb2056_device isdb2056;
+	} ctx;
+};
+
+static DEFINE_MUTEX(px4_usb_glock);
+static LIST_HEAD(px4_usb_ctx_list);
+static struct ptx_chrdev_context *px4_usb_chrdev_ctx[7];
+
+static int px4_usb_init_bridge(struct device *dev, struct usb_device *usb_dev,
+			       struct it930x_bridge *it930x)
+{
+	struct itedtv_bus *bus = &it930x->bus;
+
+	bus->dev = dev;
+	bus->type = ITEDTV_BUS_USB;
+	bus->usb.dev = usb_dev;
+	bus->usb.ctrl_timeout = 3000;
+	bus->usb.streaming.urb_buffer_size = 188 * px4_usb_params.urb_max_packets;
+	bus->usb.streaming.urb_num = px4_usb_params.max_urbs;
+	bus->usb.streaming.no_dma = px4_usb_params.no_dma;
+
+	it930x->dev = dev;
+	it930x->config.xfer_size = 188 * px4_usb_params.xfer_packets;
+	it930x->config.i2c_speed = 0x07;
+
+	return 0;
+}
+
+static int px4_usb_probe(struct usb_interface *intf,
+			 const struct usb_device_id *id)
+{
+	int ret = 0;
+	struct device *dev;
+	struct usb_device *usb_dev;
+	struct px4_usb_context *ctx;
+
+	dev = &intf->dev;
+	usb_dev = interface_to_usbdev(intf);
+
+	if (usb_dev->speed < USB_SPEED_HIGH)
+		dev_warn(dev, "This device is operating as USB 1.1.\n");
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx) {
+		dev_err(dev, "px4_usb_probe: kzalloc(sizeof(*ctx)) failed.\n");
+		return -ENOMEM;
+	}
+
+	switch (id->idVendor) {
+	case 0x0511:
+	{
+		bool px4_use_mldev = false;
+
+		switch (id->idProduct) {
+		case USB_PID_PX_Q3U4:
+		case USB_PID_PX_Q3PE4:
+			if (!px4_device_params.disable_multi_device_power_control)
+				px4_use_mldev = true;
+			/* fall through */
+		case USB_PID_PX_W3U4:
+		case USB_PID_PX_W3PE4:
+			ret = px4_usb_init_bridge(dev, usb_dev,
+						  &ctx->ctx.px4.it930x);
+			if (ret)
+				break;
+
+			ctx->type = PX4_USB_DEVICE;
+			ret = px4_device_init(&ctx->ctx.px4, dev,
+					      usb_dev->serial, px4_use_mldev,
+					      px4_usb_chrdev_ctx[PX4_USB_DEVICE]);
+			break;
+
+		case USB_PID_DIGIBEST_ISDB2056:
+			ret = px4_usb_init_bridge(dev, usb_dev,
+						  &ctx->ctx.isdb2056.it930x);
+			if (ret)
+				break;
+
+			ctx->type = ISDB2056_USB_DEVICE;
+			ret = isdb2056_device_init(&ctx->ctx.isdb2056, dev,
+						   px4_usb_chrdev_ctx[ISDB2056_USB_DEVICE]);
+			break;
+
+		default:
+			ret = -EINVAL;
+			break;
+		}
+
+		break;
+	}
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	if (ret)
+		goto fail;
+
+	mutex_lock(&px4_usb_glock);
+	list_add_tail(&ctx->list, &px4_usb_ctx_list);
+	mutex_unlock(&px4_usb_glock);
+
+	get_device(dev);
+	usb_set_intfdata(intf, ctx);
+
+	return 0;
+
+fail:
+	if (ctx)
+		kfree(ctx);
+
+	return ret;
+}
+
+static void px4_usb_disconnect(struct usb_interface *intf)
+{
+	struct px4_usb_context *ctx;
+
+	ctx = usb_get_intfdata(intf);
+	if (!ctx) {
+		pr_err("px4_usb_disconnect: ctx is NULL.\n");
+		return;
+	}
+
+	usb_set_intfdata(intf, NULL);
+
+	mutex_lock(&px4_usb_glock);
+	list_del(&ctx->list);
+	mutex_unlock(&px4_usb_glock);
+
+	switch (ctx->type) {
+	case PX4_USB_DEVICE:
+		px4_device_term(&ctx->ctx.px4);
+		break;
+
+	case ISDB2056_USB_DEVICE:
+		isdb2056_device_term(&ctx->ctx.isdb2056);
+		break;
+
+	default:
+		// unknown device
+		break;
+	}
+
+	put_device(&intf->dev);
+	kfree(ctx);
+
+	return;
+}
+
+static int px4_usb_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	return -ENOSYS;
+}
+
+static int px4_usb_resume(struct usb_interface *intf)
+{
+	return 0;
+}
+
+static const struct usb_device_id px4_usb_ids[] = {
+	{ USB_DEVICE(0x0511, USB_PID_PX_W3U4) },
+	{ USB_DEVICE(0x0511, USB_PID_PX_Q3U4) },
+	{ USB_DEVICE(0x0511, USB_PID_PX_W3PE4) },
+	{ USB_DEVICE(0x0511, USB_PID_PX_Q3PE4) },
+	{ USB_DEVICE(0x0511, USB_PID_DIGIBEST_ISDB2056) },
+	{ 0 }
+};
+
+MODULE_DEVICE_TABLE(usb, px4_usb_ids);
+
+static struct usb_driver px4_usb_driver = {
+	.name = "px4_usb",
+	.probe = px4_usb_probe,
+	.disconnect = px4_usb_disconnect,
+	.suspend = px4_usb_suspend,
+	.resume = px4_usb_resume,
+	.id_table = px4_usb_ids
+};
+
+int px4_usb_register()
+{
+	int ret = 0;
+
+	memset(&px4_usb_chrdev_ctx, 0, sizeof(px4_usb_chrdev_ctx));
+
+	ret = ptx_chrdev_context_create("px4", "px4video",
+					PX4_USB_MAX_CHRDEV,
+					&px4_usb_chrdev_ctx[PX4_USB_DEVICE]);
+	if (ret) {
+		pr_err("px4_usb_register: ptx_chrdev_context_create() failed.\n");
+		return ret;
+	}
+
+	ret = ptx_chrdev_context_create("isdb2056", "isdb2056video",
+					ISDB2056_USB_MAX_CHRDEV,
+					&px4_usb_chrdev_ctx[ISDB2056_USB_DEVICE]);
+	if (ret) {
+		pr_err("px4_usb_register: ptx_chrdev_context_create() failed.\n");
+		ptx_chrdev_context_destroy(px4_usb_chrdev_ctx[PX4_USB_DEVICE]);
+		return ret;
+	}
+
+	ret = usb_register(&px4_usb_driver);
+	if (ret) {
+		pr_err("px4_usb_register: usb_register() failed.\n");
+		ptx_chrdev_context_destroy(px4_usb_chrdev_ctx[PX4_USB_DEVICE]);
+		ptx_chrdev_context_destroy(px4_usb_chrdev_ctx[ISDB2056_USB_DEVICE]);
+		return ret;
+	}
+
+	return 0;
+}
+
+void px4_usb_unregister()
+{
+	usb_deregister(&px4_usb_driver);
+	ptx_chrdev_context_destroy(px4_usb_chrdev_ctx[PX4_USB_DEVICE]);
+	ptx_chrdev_context_destroy(px4_usb_chrdev_ctx[ISDB2056_USB_DEVICE]);
+}

driver/px4_usb.h

@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PTX driver definitions for USB devices (px4_usb.h)
+ *
+ * Copyright (c) 2018-2020 nns779
+ */
+
+#ifndef __PX4_USB_H__
+#define __PX4_USB_H__
+
+#define USB_PID_PX_W3U4			0x083f
+#define USB_PID_PX_Q3U4			0x084a
+#define USB_PID_PX_W3PE4		0x023f
+#define USB_PID_PX_Q3PE4		0x024a
+#define USB_PID_DIGIBEST_ISDB2056	0x004b
+
+// Not supported devices
+#define USB_PID_PX_MLT5PE		0x024e
+#define USB_PID_PX_MLT8PE3		0x0252
+#define USB_PID_PX_MLT8PE5		0x0253
+#define USB_PID_DIGIBEST_ISDBT2053	0x0046
+#define USB_PID_DIGIBEST_ISDBT2057	0x004c
+#define USB_PID_DIGIBEST_ISDBT6013	0x024d
+
+enum px4_usb_device_type {
+	UNKNOWN_USB_DEVICE = 0,
+	PX4_USB_DEVICE,
+	PXMLT_USB_DEVICE,	// not supported
+	ISDBT2053_USB_DEVICE,	// not supported
+	ISDB2056_USB_DEVICE,
+	ISDBT2057_USB_DEVICE,	// not supported
+	ISDBT6013_USB_DEVICE	// not supported
+};
+
+int px4_usb_register(void);
+void px4_usb_unregister(void);
+
+#endif

driver/px4_usb_params.c

@@ -0,0 +1,35 @@
+// SPDX-Licence-Identifier: GPL-2.0-only
+/*
+ * Module parameter definitions (px4_usb_params.c)
+ *
+ * Copyright (c) 2018-2020 nns779
+ */
+
+#include "px4_usb_params.h"
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+struct px4_usb_param_set px4_usb_params = {
+	.xfer_packets = 816,
+	.urb_max_packets = 816,
+	.max_urbs = 6,
+	.no_dma = false
+};
+
+module_param_named(xfer_packets, px4_usb_params.xfer_packets,
+		   uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+MODULE_PARM_DESC(xfer_packets,
+		 "Number of transfer packets from the device. (default: 816)");
+
+module_param_named(urb_max_packets, px4_usb_params.urb_max_packets,
+		   uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+MODULE_PARM_DESC(urb_max_packets,
+		 "Maximum number of TS packets per URB. (default: 816)");
+
+module_param_named(max_urbs, px4_usb_params.max_urbs,
+		   uint, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
+MODULE_PARM_DESC(max_urbs, "Maximum number of URBs. (default: 6)");
+
+module_param_named(no_dma, px4_usb_params.no_dma,
+		   bool, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);

driver/px4_usb_params.h

@@ -0,0 +1,17 @@
+// px4_usb_params.h
+
+#ifndef __PX4_USB_PARAMS_H__
+#define __PX4_USB_PARAMS_H__
+
+#include <linux/types.h>
+
+struct px4_usb_param_set {
+	unsigned int xfer_packets;
+	unsigned int urb_max_packets;
+	unsigned int max_urbs;
+	bool no_dma;
+};
+
+extern struct px4_usb_param_set px4_usb_params;
+
+#endif

driver/ringbuffer.c

@@ -1,365 +1,263 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Ringbuffer functions (ringbuffer.c)
+ * Ringbuffer implementation (ringbuffer.c)
  *
- * Copyright (c) 2018-2019 nns779
+ * Copyright (c) 2018-2020 nns779
  */
 
-#include "print_format.h"
-
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/atomic.h>
-#include <linux/spinlock.h>
-#include <linux/sched.h>
-#include <linux/wait.h>
-#include <linux/slab.h>
-#include <linux/uaccess.h>
-
 #include "ringbuffer.h"
 
-static int _ringbuffer_init(struct ringbuffer *ringbuffer)
-{
-#ifdef RINGBUFFER_USE_SPINLOCK
-	spin_lock_init(&ringbuffer->lock);
-#endif
-	atomic_set(&ringbuffer->avail, 0);
-	atomic_set(&ringbuffer->rw_cnt, 0);
-	atomic_set(&ringbuffer->wait_cnt, 0);
-	init_waitqueue_head(&ringbuffer->wait);
-	init_waitqueue_head(&ringbuffer->data_wait);
-	ringbuffer->buf = NULL;
-	ringbuffer->buf_size = 0;
-#ifdef RINGBUFFER_USE_SPINLOCK
-	ringbuffer->data_size = 0;
-#else
-	atomic_set(&ringbuffer->data_size, 0);
-#endif
-	ringbuffer->tail_pos = 0;
-	ringbuffer->head_pos = 0;
-	ringbuffer->write_size = 0;
-	ringbuffer->write_threshold_size = 0;
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/uaccess.h>
 
-	return 0;
-}
+static void __ringbuffer_free(struct ringbuffer *ringbuf);
+static void ringbuffer_lock(struct ringbuffer *ringbuf);
 
-int ringbuffer_create(struct ringbuffer **ringbuffer)
+int ringbuffer_create(struct ringbuffer **ringbuf)
 {
-	int ret = 0;
 	struct ringbuffer *p;
 
-	*ringbuffer = NULL;
-
-	p = kzalloc(sizeof(struct ringbuffer), GFP_KERNEL);
+	p = kzalloc(sizeof(*p), GFP_KERNEL);
 	if (!p)
 		return -ENOMEM;
 
-	ret = _ringbuffer_init(p);
-	if (!ret)
-		*ringbuffer = p;
-	else
-		kfree(p);
+	atomic_set(&p->state, 0);
+	atomic_set(&p->rw_count, 0);
+	atomic_set(&p->wait_count, 0);
+	init_waitqueue_head(&p->wait);
+	p->buf = NULL;
+	p->size = 0;
+	atomic_long_set(&p->actual_size, 0);
+	atomic_long_set(&p->head, 0);
+	atomic_long_set(&p->tail, 0);
 
-	return ret;
+	*ringbuf = p;
+
+	return 0;
 }
 
-int ringbuffer_destroy(struct ringbuffer *ringbuffer)
+int ringbuffer_destroy(struct ringbuffer *ringbuf)
+{
+	ringbuffer_stop(ringbuf);
+
+	ringbuffer_lock(ringbuf);
+	__ringbuffer_free(ringbuf);
+	kfree(ringbuf);
+
+	return 0;
+}
+
+static void __ringbuffer_free(struct ringbuffer *ringbuf)
+{
+	if (ringbuf->buf)
+		free_pages((unsigned long)ringbuf->buf,
+			   get_order(ringbuf->size));
+
+	ringbuf->buf = NULL;
+	ringbuf->size = 0;
+
+	return;
+}
+
+static void __ringbuffer_reset(struct ringbuffer *ringbuf)
+{
+	atomic_long_set(&ringbuf->actual_size, 0);
+	atomic_long_set(&ringbuf->head, 0);
+	atomic_long_set(&ringbuf->tail, 0);
+
+	return;
+}
+
+static void ringbuffer_lock(struct ringbuffer *ringbuf)
+{
+	atomic_add_return(1, &ringbuf->wait_count);
+	wait_event(ringbuf->wait, !atomic_read(&ringbuf->rw_count));
+
+	return;
+}
+
+static void ringbuffer_unlock(struct ringbuffer *ringbuf)
+{
+	if (atomic_sub_return(1, &ringbuf->wait_count))
+		wake_up(&ringbuf->wait);
+
+	return;
+}
+
+int ringbuffer_alloc(struct ringbuffer *ringbuf, size_t size)
 {
 	int ret = 0;
 
-	ret = ringbuffer_free(ringbuffer);
-	if (!ret)
-		kfree(ringbuffer);
+	if (atomic_read_acquire(&ringbuf->state))
+		return -EBUSY;
 
-	return ret;
-}
+	ringbuffer_lock(ringbuf);
 
-static void _ringbuffer_free(struct ringbuffer *ringbuffer)
-{
-	free_pages((unsigned long)ringbuffer->buf,
-		   get_order(ringbuffer->buf_size));
+	if (ringbuf->buf && ringbuf->size != size)
+		__ringbuffer_free(ringbuf);
 
-	ringbuffer->buf = NULL;
-	ringbuffer->buf_size = 0;
-#ifdef RINGBUFFER_USE_SPINLOCK
-	ringbuffer->data_size = 0;
-#else
-	atomic_set(&ringbuffer->data_size, 0);
-#endif
-	ringbuffer->tail_pos = 0;
-	ringbuffer->head_pos = 0;
-	ringbuffer->write_size = 0;
-	ringbuffer->write_threshold_size = 0;
-}
+	ringbuf->size = 0;
+	__ringbuffer_reset(ringbuf);
 
-int ringbuffer_alloc(struct ringbuffer *ringbuffer, size_t size)
-{
-	int ret = 0;
-
-	// Acquire lock
-	if (atomic_add_return(1, &ringbuffer->wait_cnt) != 1) {
-		// Someone is waiting
-		ret = -EAGAIN;
-		goto exit;
-	}
-	atomic_set(&ringbuffer->avail, 0);
-	wake_up(&ringbuffer->data_wait);
-	wait_event(ringbuffer->wait, !atomic_read(&ringbuffer->rw_cnt));
-
-	if (ringbuffer->buf) {
-		if (ringbuffer->buf_size == size)
-			goto reset;
-
-		_ringbuffer_free(ringbuffer);
-	}
-
-	// Allocate
-
-	ringbuffer->buf = (u8 *)__get_free_pages(GFP_KERNEL, get_order(size));
-	if (!ringbuffer->buf) {
+	if (!ringbuf->buf) {
+		ringbuf->buf = (u8 *)__get_free_pages(GFP_KERNEL,
+						      get_order(size));
+		if (!ringbuf->buf)
 			ret = -ENOMEM;
-		goto exit;
+		else
+			ringbuf->size = size;
 	}
 
-	ringbuffer->buf_size = size;
-	ringbuffer->write_threshold_size = (size / 10);
-
-reset:
-#ifdef RINGBUFFER_USE_SPINLOCK
-	ringbuffer->data_size = 0;
-#else
-	atomic_set(&ringbuffer->data_size, 0);
-#endif
-	ringbuffer->tail_pos = 0;
-	ringbuffer->head_pos = 0;
-	ringbuffer->write_size = 0;
-
-exit:
-	// Release lock
-	atomic_sub(1, &ringbuffer->wait_cnt);
+	ringbuffer_unlock(ringbuf);
 
 	return ret;
 }
 
-int ringbuffer_free(struct ringbuffer *ringbuffer)
+int ringbuffer_free(struct ringbuffer *ringbuf)
 {
-	int ret = 0;
+	if (atomic_read_acquire(&ringbuf->state))
+		return -EBUSY;
 
-	// Acquire lock
-	if (atomic_add_return(1, &ringbuffer->wait_cnt) != 1) {
-		// Someone is waiting
-		ret = -EAGAIN;
-		goto exit;
-	}
-	atomic_set(&ringbuffer->avail, 0);
-	wake_up(&ringbuffer->data_wait);
-	wait_event(ringbuffer->wait, !atomic_read(&ringbuffer->rw_cnt));
-
-	if (!ringbuffer->buf)
-		goto exit;
-
-	_ringbuffer_free(ringbuffer);
-
-exit:
-	// Release lock
-	atomic_sub(1, &ringbuffer->wait_cnt);
-
-	return ret;
-}
-
-int ringbuffer_start(struct ringbuffer *ringbuffer)
-{
-	int ret = 0;
-
-	if (atomic_read(&ringbuffer->avail))
-		return 0;
-
-	// Acquire lock for read buffer pointer
-	if (atomic_add_return(1, &ringbuffer->wait_cnt) != 1) {
-		// Someone is waiting
-		ret = -EAGAIN;
-		goto exit;
-	}
-
-	if (ringbuffer->buf && ringbuffer->buf_size)
-		atomic_set(&ringbuffer->avail, 1);
-
-exit:
-	// Release lock
-	atomic_sub(1, &ringbuffer->wait_cnt);
-
-	return ret;
-}
-
-int ringbuffer_stop(struct ringbuffer *ringbuffer)
-{
-	atomic_set(&ringbuffer->avail, 0);
-	wake_up(&ringbuffer->data_wait);
+	ringbuffer_lock(ringbuf);
+	__ringbuffer_reset(ringbuf);
+	__ringbuffer_free(ringbuf);
+	ringbuffer_unlock(ringbuf);
 
 	return 0;
 }
 
-int ringbuffer_write_atomic(struct ringbuffer *ringbuffer,
-			    const void *data, size_t len)
+int ringbuffer_reset(struct ringbuffer *ringbuf)
 {
-#ifdef RINGBUFFER_USE_SPINLOCK
-	unsigned long flags;
-#endif
-	const u8 *p = data;
-	size_t buf_size, data_size, tail_pos, write_size;
+	if (atomic_read_acquire(&ringbuf->state))
+		return -EBUSY;
 
-	if (atomic_read(&ringbuffer->avail) != 2)
-		return -EIO;
+	ringbuffer_lock(ringbuf);
+	__ringbuffer_reset(ringbuf);
+	ringbuffer_unlock(ringbuf);
 
-	atomic_add(1, &ringbuffer->rw_cnt);
-
-	if (atomic_read(&ringbuffer->wait_cnt)) {
-		atomic_sub(1, &ringbuffer->rw_cnt);
-		wake_up(&ringbuffer->wait);
-		return -EIO;
+	return 0;
 }
 
-	buf_size = ringbuffer->buf_size;
-	tail_pos = ringbuffer->tail_pos;
+int ringbuffer_start(struct ringbuffer *ringbuf)
+{
+	if (atomic_cmpxchg(&ringbuf->state, 0, 1))
+		return -EALREADY;
 
-#ifdef RINGBUFFER_USE_SPINLOCK
-	spin_lock_irqsave(&ringbuffer->lock, flags);
-	data_size = ringbuffer->data_size;
-	spin_unlock_irqrestore(&ringbuffer->lock, flags);
-#else
-	data_size = atomic_read(&ringbuffer->data_size);
-#endif
-
-	write_size = (data_size + len <= buf_size) ? (len) : (buf_size - data_size);
-	if (write_size) {
-		size_t t = (tail_pos + write_size <= buf_size) ? (write_size) : (buf_size - tail_pos);
-
-		memcpy(ringbuffer->buf + tail_pos, p, t);
-		if (t < write_size) {
-			memcpy(ringbuffer->buf, p + t, write_size - t);
-			tail_pos = write_size - t;
-		} else {
-			tail_pos = (tail_pos + write_size == buf_size) ? 0 : (tail_pos + write_size);
+	return 0;
 }
 
-		ringbuffer->tail_pos = tail_pos;
+int ringbuffer_stop(struct ringbuffer *ringbuf)
+{
+	if (!atomic_xchg(&ringbuf->state, 0))
+		return -EALREADY;
 
-#ifdef RINGBUFFER_USE_SPINLOCK
-		spin_lock_irqsave(&ringbuffer->lock, flags);
-		ringbuffer->data_size += write_size;
-		spin_unlock_irqrestore(&ringbuffer->lock, flags);
-#else
-		atomic_add(write_size, &ringbuffer->data_size);
-#endif
-
-		if (ringbuffer->write_size >= ringbuffer->write_threshold_size) {
-			if (atomic_read(&ringbuffer->rw_cnt) > 1) {
-				wake_up(&ringbuffer->data_wait);
-				ringbuffer->write_size = 0;
-			}
-		} else {
-			ringbuffer->write_size += write_size;
-		}
+	return 0;
 }
 
-	if (!atomic_sub_return(1, &ringbuffer->rw_cnt) &&
-	    atomic_read(&ringbuffer->wait_cnt))
-		wake_up(&ringbuffer->wait);
+int ringbuffer_ready_read(struct ringbuffer *ringbuf)
+{
+	if (!atomic_cmpxchg(&ringbuf->state, 1, 2))
+		return -EINVAL;
 
-	return (write_size != len) ? (-ECANCELED) : (0);
+	return 0;
 }
 
-int ringbuffer_read_user(struct ringbuffer *ringbuffer,
+int ringbuffer_read_user(struct ringbuffer *ringbuf,
 			 void __user *buf, size_t *len)
 {
-	int ret = 0;
-	u8 *p = buf;
-	size_t buf_size, l = *len, buf_pos = 0;
+	u8 *p;
+	size_t buf_size, actual_size, head, read_size;
 
-	atomic_cmpxchg(&ringbuffer->avail, 1, 2);
+	atomic_add_return_acquire(1, &ringbuf->rw_count);
 
-	atomic_add(1, &ringbuffer->rw_cnt);
+	p = ringbuf->buf;
+	buf_size = ringbuf->size;
+	actual_size = atomic_long_read_acquire(&ringbuf->actual_size);
+	head = atomic_long_read(&ringbuf->head);
 
-	if (atomic_read(&ringbuffer->wait_cnt)) {
-		atomic_sub(1, &ringbuffer->rw_cnt);
-		wake_up(&ringbuffer->wait);
-		return -EIO;
-	}
+	read_size = (*len <= actual_size) ? *len : actual_size;
+	if (read_size) {
+		size_t tmp = (head + read_size <= buf_size) ? read_size : (buf_size - head);
+		unsigned long res;
 
-	buf_size = ringbuffer->buf_size;
+		res = copy_to_user(buf, p + head, tmp);
 
-	while (l > buf_pos) {
-#ifdef RINGBUFFER_USE_SPINLOCK
-		unsigned long flags;
-#endif
-		size_t data_size, head_pos, read_size, t;
-		unsigned long r;
-
-		if (wait_event_interruptible(ringbuffer->data_wait, (
-#ifdef RINGBUFFER_USE_SPINLOCK
-			(ringbuffer->data_size)
-#else
-			atomic_read(&ringbuffer->data_size)
-#endif
-			|| !atomic_read(&ringbuffer->avail)))
-		) {
-			if (!buf_pos)
-				ret = -EINTR;
-			break;
-		}
-
-#ifdef RINGBUFFER_USE_SPINLOCK
-		spin_lock_irqsave(&ringbuffer->lock, flags);
-		data_size = ringbuffer->data_size;
-		spin_unlock_irqrestore(&ringbuffer->lock, flags);
-#else
-		data_size = atomic_read(&ringbuffer->data_size);
-#endif
-
-		if (!data_size) {
-			if (!buf_pos)
-				ret = -EIO;
-			break;
-		}
-
-		head_pos = ringbuffer->head_pos;
-
-		read_size = (l - buf_pos > data_size) ? (data_size) : (l - buf_pos);
-
-		t = (head_pos + read_size <= buf_size) ? (read_size) : (buf_size - head_pos);
-
-		r = copy_to_user(p + buf_pos, ringbuffer->buf + head_pos, t);
-		if (r)
-			pr_debug("ringbuffer_read_user: copy_to_user() 1 failed. remain: %lu\n", r);
-
-		if (t < read_size) {
-			r = copy_to_user(p + buf_pos + t,
-					 ringbuffer->buf, read_size - t);
-			if (r)
-				pr_debug("ringbuffer_read_user: copy_to_user() 2 failed. remain: %lu\n", r);
-
-			head_pos = read_size - t;
+		if (tmp < read_size) {
+			res = copy_to_user(((u8 *)buf) + tmp, p,
+					   read_size - tmp);
+			head = read_size - tmp;
 		} else {
-			head_pos = (head_pos + read_size == buf_size) ? 0 : (head_pos + read_size);
+			head = (head + read_size == buf_size) ? 0 : (head + read_size);
 		}
 
-		ringbuffer->head_pos = head_pos;
-		buf_pos += read_size;
-
-#ifdef RINGBUFFER_USE_SPINLOCK
-		spin_lock_irqsave(&ringbuffer->lock, flags);
-		ringbuffer->data_size -= read_size;
-		spin_unlock_irqrestore(&ringbuffer->lock, flags);
-#else
-		atomic_sub(read_size, &ringbuffer->data_size);
-#endif
+		atomic_long_xchg(&ringbuf->head, head);
+		atomic_long_sub_return_release(read_size,
+					       &ringbuf->actual_size);
 	}
 
-	*len = buf_pos;
+	if (!atomic_sub_return(1, &ringbuf->rw_count) &&
+	    atomic_read(&ringbuf->wait_count))
+		wake_up(&ringbuf->wait);
 
-	if (!atomic_sub_return(1, &ringbuffer->rw_cnt) &&
-	    atomic_read(&ringbuffer->wait_cnt))
-		wake_up(&ringbuffer->wait);
+	*len = read_size;
+
+	return 0;
+}
+
+int ringbuffer_write_atomic(struct ringbuffer *ringbuf,
+			    const void *buf, size_t *len)
+{
+	int ret = 0;
+	u8 *p;
+	size_t buf_size, actual_size, tail, write_size;
+
+	if (atomic_read(&ringbuf->state) != 2)
+		return -EINVAL;
+
+	atomic_add_return_acquire(1, &ringbuf->rw_count);
+
+	p = ringbuf->buf;
+	buf_size = ringbuf->size;
+	actual_size = atomic_long_read_acquire(&ringbuf->actual_size);
+	tail = atomic_long_read(&ringbuf->tail);
+
+	write_size = (actual_size + *len <= buf_size) ? *len : (buf_size - actual_size);
+	if (write_size) {
+		size_t tmp = (tail + write_size <= buf_size) ? write_size : (buf_size - tail);
+
+		memcpy(p + tail, buf, tmp);
+
+		if (tmp < write_size) {
+			memcpy(p, ((u8 *)buf) + tmp, write_size - tmp);
+			tail = write_size - tmp;
+		} else {
+			tail = (tail + write_size == buf_size) ? 0 : (tail + write_size);
+		}
+
+		atomic_long_xchg(&ringbuf->tail, tail);
+		atomic_long_add_return_release(write_size,
+					       &ringbuf->actual_size);
+	}
+
+	if (!atomic_sub_return(1, &ringbuf->rw_count) &&
+	    atomic_read(&ringbuf->wait_count))
+		wake_up(&ringbuf->wait);
+
+	if (*len != write_size)
+		ret = -EOVERFLOW;
+
+	*len = write_size;
 
 	return ret;
 }
+
+bool ringbuffer_is_running(struct ringbuffer *ringbuf)
+{
+	return !!atomic_read_acquire(&ringbuf->state);
+}
+
+bool ringbuffer_is_readable(struct ringbuffer *ringbuf)
+{
+	return !!atomic_long_read_acquire(&ringbuf->actual_size);
+}

driver/ringbuffer.h

@@ -2,7 +2,7 @@
 /*
  * Ringbuffer definitions (ringbuffer.h)
  *
- * Copyright (c) 2018-2019 nns779
+ * Copyright (c) 2018-2020 nns779
  */
 
 #ifndef __RINGBUFFER_H__
@@ -10,40 +10,33 @@
 
 #include <linux/types.h>
 #include <linux/atomic.h>
-#include <linux/spinlock.h>
 #include <linux/wait.h>
 
 struct ringbuffer {
-#ifdef RINGBUFFER_USE_SPINLOCK
-	spinlock_t lock;	// for data_size
-#endif
-	atomic_t avail;
-	atomic_t rw_cnt;
-	atomic_t wait_cnt;
+	atomic_t state;
+	atomic_t rw_count;
+	atomic_t wait_count;
 	wait_queue_head_t wait;
-	wait_queue_head_t data_wait;
 	u8 *buf;
-	size_t buf_size;
-#ifdef RINGBUFFER_USE_SPINLOCK
-	size_t data_size;
-#else
-	atomic_t data_size;
-#endif
-	size_t tail_pos;	// write
-	size_t head_pos;	// read
-	size_t write_size;
-	size_t write_threshold_size;
+	size_t size;
+	atomic_long_t actual_size;
+	atomic_long_t head;	// read
+	atomic_long_t tail;	// write
 };
 
-int ringbuffer_create(struct ringbuffer **ringbuffer);
-int ringbuffer_destroy(struct ringbuffer *ringbuffer);
-int ringbuffer_alloc(struct ringbuffer *ringbuffer, size_t size);
-int ringbuffer_free(struct ringbuffer *ringbuffer);
-int ringbuffer_start(struct ringbuffer *ringbuffer);
-int ringbuffer_stop(struct ringbuffer *ringbuffer);
-int ringbuffer_write_atomic(struct ringbuffer *ringbuffer,
-			    const void *data, size_t len);
-int ringbuffer_read_user(struct ringbuffer *ringbuffer,
+int ringbuffer_create(struct ringbuffer **ringbuf);
+int ringbuffer_destroy(struct ringbuffer *ringbuf);
+int ringbuffer_alloc(struct ringbuffer *ringbuf, size_t size);
+int ringbuffer_free(struct ringbuffer *ringbuf);
+int ringbuffer_reset(struct ringbuffer *ringbuf);
+int ringbuffer_start(struct ringbuffer *ringbuf);
+int ringbuffer_stop(struct ringbuffer *ringbuf);
+int ringbuffer_ready_read(struct ringbuffer *ringbuf);
+int ringbuffer_read_user(struct ringbuffer *ringbuf,
 			 void __user *buf, size_t *len);
+int ringbuffer_write_atomic(struct ringbuffer *ringbuf,
+			    const void *buf, size_t *len);
+bool ringbuffer_is_readable(struct ringbuffer *ringbuf);
+bool ringbuffer_is_running(struct ringbuffer *ringbuf);
 
 #endif

driver/tc90522.c

@@ -366,6 +366,7 @@ int tc90522_init(struct tc90522_demod *demod)
 {
 	mutex_init(&demod->priv.lock);
 
+	demod->i2c_master.gate_ctrl = NULL;
 	demod->i2c_master.request = tc90522_i2c_master_request;
 	demod->i2c_master.priv = demod;
 
@@ -374,6 +375,7 @@ int tc90522_init(struct tc90522_demod *demod)
 
 int tc90522_term(struct tc90522_demod *demod)
 {
+	demod->i2c_master.gate_ctrl = NULL;
 	demod->i2c_master.request = NULL;
 	demod->i2c_master.priv = NULL;