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firmware/br-ext-chip-allwinner/board/v83x/kernel/patches/00000-drivers_bluetooth_rtl...

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diff -drupN a/drivers/bluetooth/rtl_btlpm.c b/drivers/bluetooth/rtl_btlpm.c
--- a/drivers/bluetooth/rtl_btlpm.c 1970-01-01 03:00:00.000000000 +0300
+++ b/drivers/bluetooth/rtl_btlpm.c 2022-06-12 05:28:14.000000000 +0300
@@ -0,0 +1,621 @@
+/*
+ * TI Bluesleep driver
+ * Kernel module responsible for Wake up of Host
+ * Copyright (C) 2009-2010 Texas Instruments
+
+
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * Copyright (C) 2006-2007 - Motorola
+ * Copyright (c) 2008-2009, Code Aurora Forum. All rights reserved.
+ *
+ * Date Author Comment
+ * ----------- -------------- --------------------------------
+ * 2006-Apr-28 Motorola The kernel module for running the Bluetooth(R)
+ * Sleep-Mode Protocol from the Host side
+ * 2006-Sep-08 Motorola Added workqueue for handling sleep work.
+ * 2007-Jan-24 Motorola Added mbm_handle_ioi() call to ISR.
+ * 2009-Aug-10 Motorola Changed "add_timer" to "mod_timer" to solve
+ * race when flurry of queued work comes in.
+*/
+
+#include <linux/module.h> /* kernel module definitions */
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/serial_core.h>
+#include <linux/proc_fs.h>
+
+#include <linux/wakelock.h>
+#include <linux/gpio.h>
+#include <linux/sunxi-gpio.h>
+#include <linux/of_gpio.h>
+
+#include <net/bluetooth/bluetooth.h>
+
+#include "../tty/serial/sunxi-uart.h"
+
+#define BT_SLEEP_DBG
+#undef BT_DBG
+#undef BT_ERR
+#ifdef BT_SLEEP_DBG
+#define BT_DBG(fmt, arg...) pr_debug("[BT_LPM] %s: " fmt "\n",\
+ __func__, ## arg)
+#else
+#define BT_DBG(fmt, arg...)
+#endif
+#define BT_ERR(fmt, arg...) pr_err("[BT_LPM] %s: " fmt "\n",\
+ __func__, ## arg)
+
+/*
+ * Defines
+ */
+#define VERSION "1.2"
+#define PROC_DIR "bluetooth/sleep"
+
+#define DEFAULT_UART_INDEX 1
+
+
+static void bluesleep_stop(void);
+static int bluesleep_start(void);
+
+struct bluesleep_info {
+ unsigned host_wake;
+ unsigned ext_wake;
+ unsigned host_wake_irq;
+ struct wake_lock wake_lock;
+ struct uart_port *uport;
+ unsigned host_wake_assert:1;
+ unsigned ext_wake_assert:1;
+};
+
+/* work function */
+static void bluesleep_sleep_work(struct work_struct *work);
+
+/* work queue */
+DECLARE_DELAYED_WORK(sleep_workqueue, bluesleep_sleep_work);
+
+/* Macros for handling sleep work */
+#define bluesleep_rx_busy() schedule_delayed_work(&sleep_workqueue, 0)
+#define bluesleep_tx_busy() schedule_delayed_work(&sleep_workqueue, 0)
+#define bluesleep_rx_idle() schedule_delayed_work(&sleep_workqueue, 0)
+#define bluesleep_tx_idle() schedule_delayed_work(&sleep_workqueue, 0)
+
+/* 10 second timeout */
+#define TX_TIMER_INTERVAL 10
+
+/* state variable names and bit positions */
+#define BT_PROTO 0x01
+#define BT_TXDATA 0x02
+#define BT_ASLEEP 0x04
+
+/* variable use indicate lpm modle */
+static bool has_lpm_enabled;
+
+/* struct use save platform_device from uart */
+static struct platform_device *bluesleep_uart_dev;
+
+static struct bluesleep_info *bsi;
+
+/* module usage */
+static atomic_t open_count = ATOMIC_INIT(1);
+
+/*
+ * Global variables
+ */
+
+/** Global state flags */
+static unsigned long flags;
+
+/** Tasklet to respond to change in hostwake line */
+static struct tasklet_struct hostwake_task;
+
+/** Transmission timer */
+static struct timer_list tx_timer;
+
+/** Lock for state transitions */
+static spinlock_t rw_lock;
+
+
+struct proc_dir_entry *bluetooth_dir, *sleep_dir;
+extern int enable_gpio_wakeup_src(int para);
+
+/*
+ * Local functions
+ */
+
+/**
+ * @return 1 if the Host can go to sleep, 0 otherwise.
+ */
+static inline int bluesleep_can_sleep(void)
+{
+ /* check if BT_WAKE_HOST_GPIO deasserted */
+ return (gpio_get_value(bsi->host_wake) != bsi->host_wake_assert) &&
+ (bsi->uport != NULL);
+}
+
+/*
+ * after bt wakeup should clean BT_ASLEEP flag and start time.
+ */
+void bluesleep_sleep_wakeup(void)
+{
+ if (test_bit(BT_ASLEEP, &flags)) {
+ BT_DBG("waking up...");
+ /* Start the timer */
+ mod_timer(&tx_timer, jiffies + (TX_TIMER_INTERVAL * HZ));
+ clear_bit(BT_ASLEEP, &flags);
+ }
+}
+
+/**
+ * @brief@ main sleep work handling function which update the flags
+ * and activate and deactivate UART ,check FIFO.
+ */
+static void bluesleep_sleep_work(struct work_struct *work)
+{
+ if (bluesleep_can_sleep()) {
+ /* already asleep, this is an error case */
+ if (test_bit(BT_ASLEEP, &flags)) {
+ BT_DBG("already asleep");
+ return;
+ }
+ if (bsi->uport->ops->tx_empty(bsi->uport)) {
+ BT_DBG("going to sleep...");
+ set_bit(BT_ASLEEP, &flags);
+ wake_lock_timeout(&bsi->wake_lock, HZ / 2);
+ } else {
+ mod_timer(&tx_timer,
+ jiffies + (TX_TIMER_INTERVAL * HZ));
+ return;
+ }
+ } else if (!test_bit(BT_ASLEEP, &flags)) {
+ mod_timer(&tx_timer, jiffies + (TX_TIMER_INTERVAL * HZ));
+ } else {
+ bluesleep_sleep_wakeup();
+ }
+}
+
+/**
+ * A tasklet function that runs in tasklet context and reads the value
+ * of the HOST_WAKE GPIO pin and further defer the work.
+ * @param data Not used.
+ */
+static void bluesleep_hostwake_task(unsigned long data)
+{
+ BT_DBG("hostwake line change");
+ spin_lock(&rw_lock);
+
+ if (gpio_get_value(bsi->host_wake) == bsi->host_wake_assert)
+ bluesleep_rx_busy();
+ else
+ bluesleep_rx_idle();
+
+ spin_unlock(&rw_lock);
+}
+
+static struct uart_port *bluesleep_get_uart_port(void)
+{
+ struct uart_port *uport = NULL;
+
+ if (bluesleep_uart_dev) {
+ uport = platform_get_drvdata(bluesleep_uart_dev);
+ if (uport)
+ BT_DBG(
+ "%s get uart_port from blusleep_uart_dev: %s, port irq: %d",
+ __func__, bluesleep_uart_dev->name,
+ uport->irq);
+ }
+ return uport;
+}
+
+static int bluesleep_lpm_proc_show(struct seq_file *m, void *v)
+{
+ seq_printf(m, "lpm enable: %d\n", has_lpm_enabled);
+ return 0;
+}
+
+static int bluesleep_lpm_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, bluesleep_lpm_proc_show, NULL);
+}
+
+static ssize_t bluesleep_write_proc_lpm(struct file *file,
+ const char __user *buffer,
+ size_t count, loff_t *pos)
+{
+ char b;
+
+ if (count < 1)
+ return -EINVAL;
+
+ if (copy_from_user(&b, buffer, 1))
+ return -EFAULT;
+
+ if (b == '0') {
+ /* HCI_DEV_UNREG */
+ bluesleep_stop();
+ has_lpm_enabled = false;
+ bsi->uport = NULL;
+ } else {
+ /* HCI_DEV_REG */
+ if (!has_lpm_enabled) {
+ has_lpm_enabled = true;
+ if (bluesleep_uart_dev)
+ bsi->uport = bluesleep_get_uart_port();
+
+ /* if bluetooth started, start bluesleep*/
+ bluesleep_start();
+ }
+ }
+
+ return count;
+}
+
+static const struct file_operations lpm_fops = {
+ .owner = THIS_MODULE,
+ .open = bluesleep_lpm_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = bluesleep_write_proc_lpm,
+};
+
+/**
+ * Handles transmission timer expiration.
+ * @param data Not used.
+ */
+static void bluesleep_tx_timer_expire(unsigned long data)
+{
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&rw_lock, irq_flags);
+
+ BT_DBG("Tx timer expired");
+
+ /* were we silent during the last timeout */
+ if (!test_bit(BT_TXDATA, &flags)) {
+ BT_DBG("Tx has been idle");
+ bluesleep_tx_idle();
+ } else {
+ BT_DBG("Tx data during last period");
+ mod_timer(&tx_timer, jiffies + (TX_TIMER_INTERVAL*HZ));
+ }
+
+ /* clear the incoming data flag */
+ clear_bit(BT_TXDATA, &flags);
+
+ spin_unlock_irqrestore(&rw_lock, irq_flags);
+}
+
+/**
+ * Schedules a tasklet to run when receiving an interrupt on the
+ * <code>HOST_WAKE</code> GPIO pin.
+ * @param irq Not used.
+ * @param dev_id Not used.
+ */
+static irqreturn_t bluesleep_hostwake_isr(int irq, void *dev_id)
+{
+ /* schedule a tasklet to handle the change in the host wake line */
+ tasklet_schedule(&hostwake_task);
+ wake_lock(&bsi->wake_lock);
+ return IRQ_HANDLED;
+}
+
+/**
+ * Starts the Sleep-Mode Protocol on the Host.
+ * @return On success, 0. On error, -1, and <code>errno</code> is set
+ * appropriately.
+ */
+static int bluesleep_start(void)
+{
+ int retval;
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&rw_lock, irq_flags);
+
+ if (test_bit(BT_PROTO, &flags)) {
+ spin_unlock_irqrestore(&rw_lock, irq_flags);
+ return 0;
+ }
+
+ spin_unlock_irqrestore(&rw_lock, irq_flags);
+
+ if (!atomic_dec_and_test(&open_count)) {
+ atomic_inc(&open_count);
+ return -EBUSY;
+ }
+
+ /* start the timer */
+ mod_timer(&tx_timer, jiffies + (TX_TIMER_INTERVAL*HZ));
+
+ retval = request_irq(bsi->host_wake_irq, bluesleep_hostwake_isr,
+ IRQF_TRIGGER_FALLING |
+ IRQF_TRIGGER_RISING | IRQF_NO_SUSPEND,
+ "bluetooth hostwake", NULL);
+ if (retval < 0) {
+ BT_ERR("Couldn't acquire BT_HOST_WAKE IRQ");
+ goto fail;
+ }
+
+ retval = enable_irq_wake(bsi->host_wake_irq);
+ if (retval < 0) {
+ BT_ERR("Couldn't enable BT_HOST_WAKE as wakeup interrupt");
+ free_irq(bsi->host_wake_irq, NULL);
+ goto fail;
+ }
+
+ set_bit(BT_PROTO, &flags);
+ wake_lock(&bsi->wake_lock);
+
+ return 0;
+fail:
+ del_timer(&tx_timer);
+ atomic_inc(&open_count);
+
+ return retval;
+}
+
+/**
+ * Stops the Sleep-Mode Protocol on the Host.
+ */
+static void bluesleep_stop(void)
+{
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&rw_lock, irq_flags);
+
+ if (!test_bit(BT_PROTO, &flags)) {
+ spin_unlock_irqrestore(&rw_lock, irq_flags);
+ return;
+ }
+
+ del_timer(&tx_timer);
+ clear_bit(BT_PROTO, &flags);
+
+ if (test_bit(BT_ASLEEP, &flags))
+ clear_bit(BT_ASLEEP, &flags);
+
+ atomic_inc(&open_count);
+
+ spin_unlock_irqrestore(&rw_lock, irq_flags);
+ if (disable_irq_wake(bsi->host_wake_irq))
+ BT_ERR("Couldn't disable hostwake IRQ wakeup mode\n");
+ free_irq(bsi->host_wake_irq, NULL);
+ wake_lock_timeout(&bsi->wake_lock, HZ / 2);
+}
+
+static int __init bluesleep_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ struct gpio_config config;
+ int ret, uart_index;
+ u32 val;
+
+ bsi = devm_kzalloc(&pdev->dev, sizeof(struct bluesleep_info),
+ GFP_KERNEL);
+ if (!bsi)
+ return -ENOMEM;
+
+ bsi->host_wake = of_get_named_gpio_flags(np, "bt_hostwake",
+ 0, (enum of_gpio_flags *)&config);
+ if (!gpio_is_valid(bsi->host_wake)) {
+ BT_ERR("get gpio bt_hostwake failed\n");
+ return -EINVAL;
+ }
+
+ BT_DBG(
+ "bt_hostwake gpio=%d mul-sel=%d pull=%d drv_level=%d data=%d\n",
+ config.gpio,
+ config.mul_sel,
+ config.pull,
+ config.drv_level,
+ config.data);
+
+ ret = devm_gpio_request(dev, bsi->host_wake, "bt_hostwake");
+ if (ret < 0) {
+ BT_ERR("can't request bt_hostwake gpio %d\n",
+ bsi->host_wake);
+ return ret;
+ }
+ ret = gpio_direction_input(bsi->host_wake);
+ if (ret < 0) {
+ BT_ERR("can't request input direction bt_wake gpio %d\n",
+ bsi->host_wake);
+ return ret;
+ }
+
+ ret = enable_gpio_wakeup_src(bsi->host_wake);
+ if (ret < 0) {
+ BT_ERR("can't enable wakeup src for bt_hostwake %d\n",
+ bsi->host_wake);
+ return ret;
+ }
+#if 0
+ bsi->ext_wake = of_get_named_gpio_flags(np, "bt_wake",
+ 0, (enum of_gpio_flags *)&config);
+ if (!gpio_is_valid(bsi->ext_wake)) {
+ BT_ERR("get gpio bt_wake failed\n");
+ return -EINVAL;
+ }
+
+ BT_DBG(
+ "bt_wake gpio=%d mul-sel=%d pull=%d drv_level=%d data=%d\n",
+ config.gpio,
+ config.mul_sel,
+ config.pull,
+ config.drv_level,
+ config.data);
+
+ ret = devm_gpio_request(dev, bsi->ext_wake, "bt_wake");
+ if (ret < 0) {
+ BT_ERR("can't request bt_wake gpio %d\n",
+ bsi->ext_wake);
+ return ret;
+ }
+
+ /* 1.set bt_wake as output and the level is assert, assert bt wake */
+ ret = gpio_direction_output(bsi->ext_wake, bsi->ext_wake_assert);
+ if (ret < 0) {
+ BT_ERR("can't request output direction bt_wake gpio %d\n",
+ bsi->ext_wake);
+ return ret;
+ }
+
+ /* set ext_wake_assert and host_wake_assert */
+ bsi->ext_wake_assert = bsi->host_wake_assert = config.data;
+#endif
+ /* 2.get bt_host_wake gpio irq */
+ bsi->host_wake_irq = gpio_to_irq(bsi->host_wake);
+ if (IS_ERR_VALUE(bsi->host_wake_irq)) {
+ BT_ERR("map gpio [%d] to virq failed, errno = %d\n",
+ bsi->host_wake, bsi->host_wake_irq);
+ ret = -ENODEV;
+ return ret;
+ }
+
+ uart_index = DEFAULT_UART_INDEX;
+ if (!of_property_read_u32(np, "uart_index", &val)) {
+ switch (val) {
+ case 0:
+ case 1:
+ case 2:
+ uart_index = val;
+ break;
+ default:
+ BT_ERR("unsupported uart_index (%u)\n", val);
+ }
+ }
+ BT_DBG("uart_index (%u)\n", uart_index);
+ bluesleep_uart_dev = sw_uart_get_pdev(uart_index);
+
+ wake_lock_init(&bsi->wake_lock, WAKE_LOCK_SUSPEND, "bluesleep");
+ return 0;
+}
+
+static int bluesleep_remove(struct platform_device *pdev)
+{
+ if (test_bit(BT_PROTO, &flags)) {
+ if (disable_irq_wake(bsi->host_wake_irq))
+ BT_ERR("Couldn't disable hostwake IRQ wakeup mode\n");
+ free_irq(bsi->host_wake_irq, NULL);
+ del_timer(&tx_timer);
+ }
+
+ wake_lock_destroy(&bsi->wake_lock);
+ return 0;
+}
+
+static int bluesleep_resume(struct platform_device *pdev)
+{
+ BT_DBG("%s", __func__);
+
+ return 0;
+}
+
+static int bluesleep_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ BT_DBG("%s", __func__);
+
+ return 0;
+}
+
+static const struct of_device_id sunxi_btlpm_ids[] = {
+ { .compatible = "allwinner,sunxi-btlpm" },
+ { /* Sentinel */ }
+};
+
+static struct platform_driver bluesleep_driver = {
+ .remove = bluesleep_remove,
+ .suspend = bluesleep_suspend,
+ .resume = bluesleep_resume,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "sunxi-btlpm",
+ .of_match_table = sunxi_btlpm_ids,
+ },
+};
+
+/**
+ * Initializes the module.
+ * @return On success, 0. On error, -1, and <code>errno</code> is set
+ * appropriately.
+ */
+static int __init bluesleep_init(void)
+{
+ int retval;
+ struct proc_dir_entry *ent;
+
+ BT_DBG("BlueSleep Mode Driver Ver %s", VERSION);
+
+ retval = platform_driver_probe(&bluesleep_driver, bluesleep_probe);
+ if (retval)
+ return retval;
+
+ bluetooth_dir = proc_mkdir("bluetooth", NULL);
+ if (bluetooth_dir == NULL) {
+ BT_ERR("Unable to create /proc/bluetooth directory");
+ return -ENOMEM;
+ }
+
+ sleep_dir = proc_mkdir("sleep", bluetooth_dir);
+ if (sleep_dir == NULL) {
+ BT_ERR("Unable to create /proc/%s directory", PROC_DIR);
+ return -ENOMEM;
+ }
+ /* read/write proc entries */
+ ent = proc_create("lpm", 0660, sleep_dir, &lpm_fops);
+ if (ent == NULL) {
+ BT_ERR("Unable to create /proc/%s/lpm entry", PROC_DIR);
+ retval = -ENOMEM;
+ goto fail;
+ }
+
+ flags = 0; /* clear all status bits */
+
+ /* Initialize spinlock. */
+ spin_lock_init(&rw_lock);
+
+ /* Initialize timer */
+ init_timer(&tx_timer);
+ tx_timer.function = bluesleep_tx_timer_expire;
+ tx_timer.data = 0;
+
+ /* initialize host wake tasklet */
+ tasklet_init(&hostwake_task, bluesleep_hostwake_task, 0);
+
+ return 0;
+
+fail:
+ remove_proc_entry("lpm", sleep_dir);
+ remove_proc_entry("sleep", bluetooth_dir);
+ remove_proc_entry("bluetooth", 0);
+ return retval;
+}
+
+/**
+ * Cleans up the module.
+ */
+static void __exit bluesleep_exit(void)
+{
+ platform_driver_unregister(&bluesleep_driver);
+
+ remove_proc_entry("lpm", sleep_dir);
+ remove_proc_entry("sleep", bluetooth_dir);
+ remove_proc_entry("bluetooth", 0);
+}
+
+module_init(bluesleep_init);
+module_exit(bluesleep_exit);
+
+MODULE_DESCRIPTION("Bluetooth Sleep Mode Driver ver %s " VERSION);
+#ifdef MODULE_LICENSE
+MODULE_LICENSE("GPL");
+#endif
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