drivers: airoha: Import Xiaomi drivers

* From dagu-s-oss
* Run clang-format on source files

Change-Id: I399a7668b815ee3afacda9a69bfce01536c13f9c

drivers/airoha/Kconfig

@@ -0,0 +1,4 @@
+config AIROHA_GPS
+	tristate "Airoha GPS Support"
+	help
+		Airoha GPS Support

drivers/airoha/Makefile

@@ -0,0 +1 @@
+obj-$(CONFIG_AIROHA_GPS)		+= airoha_gps_driver.o

drivers/airoha/airoha_gps_driver.c

@@ -0,0 +1,316 @@
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/gpio.h>
+#include <linux/cdev.h>
+#include <linux/mod_devicetable.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/kdev_t.h>
+#include <linux/uaccess.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <asm/atomic.h>
+#include <linux/semaphore.h>
+#include "airoha_gps_driver.h"
+#include <linux/pinctrl/consumer.h>
+
+#include <linux/ioport.h>
+
+#include <linux/tty.h>
+#include <linux/serial.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/gpio.h>
+
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/clk.h>
+
+#include <linux/tty_flip.h>
+#include <linux/sysrq.h>
+
+#include <linux/serial_core.h>
+
+#define GPS_MAJOR 1
+#define GPS_MINOR 2
+//Todo: parser pin info from .dtsi
+#define AIROHA_LDO_PIN 1146
+//#define AIROHA_HOST_TO_GPS_PIN 1258
+//#define AIROHA_GPS_TO_HOST_PIN 122
+#define AIROHA_GPS_DEVICE_NAME "airoha_gps"
+#define AIROHA_LOG_TAG "[airoha_gps] "
+
+#define airoha_printk(format, args...) printk(AIROHA_LOG_TAG format, ##args)
+#define UNUSED(obj) (void)obj;
+
+/* GLOBAL SYMBOL      */
+static dev_t gps_dev_number;
+static struct class *gps_class;
+struct cdev *gps_dev = NULL;
+
+//condition
+static wait_queue_head_t gps_wait_queue;
+static atomic_t is_interrupt_happen;
+static struct semaphore gps_file_lock;
+static struct semaphore gps_file_operation_lock; //read /write can't reenter
+static int open_num = 0;
+struct pinctrl *pctrl;
+struct pinctrl_state *pctrl_mode_active, *pctrl_mode_idle;
+int request_ldo_pin_global;
+/* GLOBAL SYMBOL END */
+
+static int airoha_gps_open(struct inode *inode, struct file *file_p)
+{
+	down(&gps_file_lock);
+	open_num++;
+	airoha_printk("gps_open,count:%d\n", open_num);
+	up(&gps_file_lock);
+
+	return 0;
+}
+static int airoha_gps_release(struct inode *inode, struct file *file_p)
+{
+	down(&gps_file_lock);
+	open_num--;
+	airoha_printk("gps_release,count:%d\n", open_num);
+	up(&gps_file_lock);
+	return 0;
+}
+static ssize_t airoha_gps_read(struct file *file_p, char __user *user,
+			       size_t len, loff_t *offset)
+{
+	int result = 0;
+	int copy_len = 0;
+	char buffer[20] = "INTERRUPT\n";
+	wait_event(gps_wait_queue, atomic_read(&is_interrupt_happen) > 0);
+	down(&gps_file_operation_lock);
+
+	if (len > 20)
+		copy_len = 20;
+	else
+		copy_len = len;
+	result = copy_to_user(user, buffer, copy_len);
+	atomic_dec(&is_interrupt_happen);
+	up(&gps_file_operation_lock);
+	return len;
+}
+static ssize_t airoha_gps_write(struct file *file_p, const char __user *user,
+				size_t len, loff_t *offset)
+{
+	char buffer[21] = { 0 };
+	int result = 0;
+	int copy_len;
+
+	if (len > 20)
+		copy_len = 20;
+	else
+		copy_len = len;
+	result = copy_from_user(buffer, user, copy_len);
+	airoha_printk("airoha_gps_write %s\n", buffer);
+	if (strstr(buffer, "OPEN") != NULL)
+		gps_chip_enable(1);
+	else if (strstr(buffer, "CLOSE") != NULL)
+		gps_chip_enable(0);
+	else if (strstr(buffer, "DI") != NULL) {
+		result = pinctrl_select_state(pctrl, pctrl_mode_idle);
+		if (result < 0) {
+			airoha_printk("%s : change gps chip idle failed!\n",
+				      __func__);
+		}
+	}
+	//gpio_direction_output(AIROHA_HOST_TO_GPS_PIN, 0);
+	else if (strstr(buffer, "DF") != NULL) {
+		result = pinctrl_select_state(pctrl, pctrl_mode_active);
+		if (result < 0) {
+			airoha_printk("%s : change gps chip active failed!\n",
+				      __func__);
+		}
+		//gpio_direction_output(AIROHA_HOST_TO_GPS_PIN, 1);
+	}
+	return copy_len;
+}
+static struct file_operations gps_cdev_ops = {
+	.open = airoha_gps_open,
+	.write = airoha_gps_write,
+	.read = airoha_gps_read,
+	.release = airoha_gps_release,
+
+	.owner = THIS_MODULE,
+};
+
+/*irqreturn_t gps_interrupt_proc(int n,void *args){
+	//airoha_printk("Interrupt happen!!!\n");
+	atomic_inc(&is_interrupt_happen);
+	wake_up(&gps_wait_queue);
+	return IRQ_HANDLED;
+}*/
+static int xiaomi_uart_probe(struct platform_device *pdev)
+{
+	int request_ldo_pin;
+	int result;
+	int ret;
+	airoha_printk("====GPIO init Begin======\n");
+	//request_ldo_pin = gpio_request(AIROHA_LDO_PIN,"airoha_gps_ldo_pin");
+	//request_data_in_pin = gpio_request(AIROHA_HOST_TO_GPS_PIN,"airoha_host_to_gps_pin");
+	//request_interrupt_pin = gpio_request(AIROHA_GPS_TO_HOST_PIN,"airoha_gps_to_host_pin");
+	if (!pdev->dev.of_node) {
+		airoha_printk("Failed to find of_node\n");
+		goto err_exit;
+	}
+	request_ldo_pin = of_get_named_gpio(pdev->dev.of_node, "gps-ldo", 0);
+	if ((!gpio_is_valid(request_ldo_pin)))
+		return -EINVAL;
+	ret = gpio_request(request_ldo_pin, "gps-ldo");
+	if (ret) {
+		airoha_printk("request GPS ldo pin fail %d", ret);
+		goto err_exit;
+	}
+	ret = gpio_direction_output(request_ldo_pin, 0);
+	if (ret) {
+		airoha_printk("set GPS ldo pin as out mode fail %d", ret);
+		goto err_exit;
+	}
+	request_ldo_pin_global = request_ldo_pin;
+	airoha_printk("pin info:\n");
+	airoha_printk("ldo...%d\n", request_ldo_pin);
+	//airoha_printk("data_in...%d\n",request_data_in_pin);
+	//airoha_printk("interrupt_pin...%d\n",request_interrupt_pin);
+	//Set GPIO direction
+	//gpio_direction_input(AIROHA_GPS_TO_HOST_PIN);
+	//gpio_direction_output(AIROHA_LDO_PIN, 0);
+	//gpio_direction_output(AIROHA_HOST_TO_GPS_PIN, 1);
+	//register interrupt
+	//gps_interrupt = gpio_to_irq(AIROHA_GPS_TO_HOST_PIN);
+	//airoha_printk("get_interrupt_num...%d\n",gps_interrupt);
+	/*result = request_irq(gps_interrupt, gps_interrupt_proc,
+		IRQF_TRIGGER_RISING, "airoha_gps_interrupt", NULL);
+	airoha_printk("request interrupt...%d\n",result);*/
+
+	airoha_printk("====GPIO init done!!======\n");
+	airoha_printk("====Device init...\n");
+	result = alloc_chrdev_region(&gps_dev_number, 0, 1, "airoha_gps_dev");
+
+	gps_dev = cdev_alloc();
+	if (!gps_dev) {
+		airoha_printk("cdev alloc error!\n");
+		return -EPERM;
+	}
+	gps_dev->owner = THIS_MODULE;
+	gps_dev->ops = &gps_cdev_ops;
+	cdev_init(gps_dev, &gps_cdev_ops);
+	cdev_add(gps_dev, gps_dev_number, 1);
+	gps_class = class_create(THIS_MODULE, AIROHA_GPS_DEVICE_NAME);
+	device_create(gps_class, NULL, gps_dev_number, 0,
+		      AIROHA_GPS_DEVICE_NAME);
+
+	pctrl = devm_pinctrl_get(&pdev->dev);
+	if (IS_ERR(pctrl)) {
+		airoha_printk("%s: Unable to allocate pinctrl: %d\n", __FILE__,
+			      PTR_ERR(pctrl));
+		return -1;
+	}
+
+	pctrl_mode_active = pinctrl_lookup_state(pctrl, "gps_enable_active");
+	if (IS_ERR(pctrl_mode_active)) {
+		airoha_printk("%s: Unable to find pinctrl_state_mode_spi: %d\n",
+			      __FILE__, PTR_ERR(pctrl_mode_active));
+		return -1;
+	}
+
+	pctrl_mode_idle = pinctrl_lookup_state(pctrl, "gps_enable_suspend");
+	if (IS_ERR(pctrl_mode_idle)) {
+		airoha_printk(
+			"%s: Unable to find pinctrl_state_mode_idle: %d\n",
+			__FILE__, PTR_ERR(pctrl_mode_idle));
+		return -1;
+	}
+	airoha_printk("[dsc]%s : pinctrl initialized\n", __func__);
+
+	airoha_printk("====Device init Done\n");
+	airoha_printk("Please check /dev/%s\n", AIROHA_GPS_DEVICE_NAME);
+	airoha_printk("Wait....\n");
+	//Init wait queue
+	init_waitqueue_head(&gps_wait_queue);
+	atomic_set(&is_interrupt_happen, 0);
+	sema_init(&gps_file_lock, 1);
+	sema_init(&gps_file_operation_lock, 1);
+	//
+
+	return 0;
+err_exit:
+	return -1;
+}
+
+//Common Api
+static int gps_chip_enable(bool enable)
+{
+	if (enable)
+		gpio_direction_output(request_ldo_pin_global, 1);
+	else
+		gpio_direction_output(request_ldo_pin_global, 0);
+	return 0;
+}
+
+static int xiaomi_uart_remove(struct platform_device *pdev)
+{
+	//g_bcm_gps = NULL;
+	//platform_driver_unregister(&airoha_gps_driver);
+	device_destroy(gps_class, gps_dev_number);
+	class_destroy(gps_class);
+	unregister_chrdev_region(gps_dev_number, 1);
+	gpio_free(request_ldo_pin_global);
+	//gpio_free(AIROHA_GPS_TO_HOST_PIN);
+	//gpio_free(AIROHA_HOST_TO_GPS_PIN);
+	//free_irq(gps_interrupt,NULL);
+
+	airoha_printk("====gps driver exit======\n");
+	printk("[airoha_gps] exit! \n");
+	return 0;
+}
+
+static const struct of_device_id match_table[] = {
+	{
+		.compatible = "bcm4775",
+	},
+	{},
+};
+
+/*
+ * platform driver stuff
+ */
+static struct platform_driver xiaomi_uart_platform_driver = {
+	.probe	= xiaomi_uart_probe,
+	.remove	= xiaomi_uart_remove,
+	.driver	= {
+		.name  = "bcm4775",
+		.of_match_table = match_table,
+	},
+};
+
+static int __init xiaomi_tty_init(void)
+{
+	int ret;
+	printk(KERN_ERR "!!! bcm_tty_init  to go");
+	ret = platform_driver_register(&xiaomi_uart_platform_driver);
+	printk(KERN_ERR
+	       "!!! platform_driver_register  sspbbd bcm_gps_tty misc_register ret is %d",
+	       ret);
+
+	return ret;
+}
+
+static void __exit xiaomi_tty_exit(void)
+{
+	platform_driver_unregister(&xiaomi_uart_platform_driver);
+}
+
+MODULE_LICENSE("GPL");
+module_init(xiaomi_tty_init);
+module_exit(xiaomi_tty_exit);

drivers/airoha/airoha_gps_driver.h

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+#ifndef _AIROHA_GPS_DRIVER_H
+#define _AIROHA_GPS_DRIVER_H
+
+#include <linux/gpio.h>
+#include <linux/cdev.h>
+#include <linux/mod_devicetable.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/types.h>
+/** This macro will make msg readable */
+#define AIROHA_STRING_INFO
+
+static int airoha_gps_open(struct inode *inode, struct file *file_p);
+static ssize_t airoha_gps_read(struct file *file_p, char __user *user,
+			       size_t len, loff_t *offset);
+static ssize_t airoha_gps_write(struct file *file_p, const char __user *user,
+				size_t len, loff_t *offset);
+
+//Common API
+static int gps_chip_enable(bool enable);
+
+//END of API
+
+typedef struct {
+	int msg_number;
+#ifdef AIROHA_STRING_INFO
+	char msg_buffer[20];
+#endif
+} airoha_gps_msg;
+
+typedef airoha_gps_msg airoha_gps_msg_t;
+/* gps chip event */
+#define GPS_EVENT_GPS_DATA_IN 0xFF00
+#define GPS_EVENT_TEST_RESPONSE 0xFFA0
+/* gps chip event end */
+
+/* gps action */
+#define GPS_ACTION_CHIP_ENABLE 0xAA00
+#define GPS_ACTION_CHIP_DISABLE 0xAA01
+#define GPS_ACTION_WAKEUP_CHIP 0xAA02
+#define GPS_ACTION_TEST 0xA0A0
+
+#endif