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#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/semaphore.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/fixed.h>
#include <plat/gpio-cfg.h>
#include <mach/gpio.h>
#include <mach/usb_switch.h>
struct device *sec_switch_dev;
enum usb_path_t current_path = USB_PATH_NONE;
static struct semaphore usb_switch_sem;
static bool usb_connected;
static ssize_t show_usb_sel(struct device *dev,
struct device_attribute *attr, char *buf)
{
const char *mode;
if (current_path & USB_PATH_CP) {
/* CP */
mode = "MODEM";
} else {
/* AP */
mode = "PDA";
}
pr_info("%s: %s\n", __func__, mode);
return sprintf(buf, "%s\n", mode);
}
static ssize_t store_usb_sel(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
pr_info("%s: %s\n", __func__, buf);
if (!strncasecmp(buf, "PDA", 3)) {
usb_switch_lock();
usb_switch_clr_path(USB_PATH_CP);
usb_switch_unlock();
} else if (!strncasecmp(buf, "MODEM", 5)) {
usb_switch_lock();
usb_switch_set_path(USB_PATH_CP);
usb_switch_unlock();
} else {
pr_err("%s: wrong usb_sel value(%s)!!\n", __func__, buf);
return -EINVAL;
}
return count;
}
static ssize_t show_uart_sel(struct device *dev,
struct device_attribute *attr, char *buf)
{
int val_sel;
const char *mode;
val_sel = gpio_get_value(GPIO_UART_SEL);
if (val_sel == 0) {
/* CP */
mode = "CP";
} else {
/* AP */
mode = "AP";
}
pr_info("%s: %s\n", __func__, mode);
return sprintf(buf, "%s\n", mode);
}
static ssize_t store_uart_sel(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int uart_sel = -1;
pr_info("%s: %s\n", __func__, buf);
if (!strncasecmp(buf, "AP", 2)) {
uart_sel = 1;
} else if (!strncasecmp(buf, "CP", 2)) {
uart_sel = 0;
} else {
pr_err("%s: wrong uart_sel value(%s)!!\n", __func__, buf);
return -EINVAL;
}
/* 1 for AP, 0 for CP */
gpio_set_value(GPIO_UART_SEL, uart_sel);
return count;
}
static ssize_t show_usb_state(struct device *dev,
struct device_attribute *attr, char *buf)
{
const char *state;
if (usb_connected)
state = "USB_STATE_CONFIGURED";
else
state = "USB_STATE_NOTCONFIGURED";
pr_info("%s: %s\n", __func__, state);
return sprintf(buf, "%s\n", state);
}
static DEVICE_ATTR(usb_sel, 0664, show_usb_sel, store_usb_sel);
static DEVICE_ATTR(uart_sel, 0664, show_uart_sel, store_uart_sel);
static DEVICE_ATTR(usb_state, S_IRUGO, show_usb_state, NULL);
static struct attribute *px_switch_attributes[] = {
&dev_attr_usb_sel.attr,
&dev_attr_uart_sel.attr,
&dev_attr_usb_state.attr,
NULL
};
static const struct attribute_group px_switch_group = {
.attrs = px_switch_attributes,
};
void set_usb_connection_state(bool connected)
{
pr_info("%s: set %s\n", __func__, (connected ? "True" : "False"));
if (usb_connected != connected) {
usb_connected = connected;
pr_info("%s: send \"usb_state\" sysfs_notify\n", __func__);
sysfs_notify(&sec_switch_dev->kobj, NULL, "usb_state");
}
}
static void usb_apply_path(enum usb_path_t path)
{
pr_info("%s: current gpio before changing : sel1:%d\n",
__func__, gpio_get_value(GPIO_USB_SEL1));
pr_info("%s: target path %x\n", __func__, path);
if (path & USB_PATH_ADCCHECK) {
gpio_set_value(GPIO_USB_SEL1, 0);
return;
}
/* default : AP */
gpio_set_value(GPIO_USB_SEL1, 1);
return;
}
/*
Typical usage of usb switch:
usb_switch_lock(); (alternatively from hard/soft irq context)
( or usb_switch_trylock() )
...
usb_switch_set_path(USB_PATH_ADCCHECK);
...
usb_switch_set_path(USB_PATH_TA);
...
usb_switch_unlock(); (this restores previous usb switch settings)
*/
void usb_switch_set_path(enum usb_path_t path)
{
pr_info("%s: %x current_path before changing\n",
__func__, current_path);
current_path |= path;
usb_apply_path(current_path);
}
void usb_switch_clr_path(enum usb_path_t path)
{
pr_info("%s: %x current_path before changing\n",
__func__, current_path);
current_path &= ~path;
usb_apply_path(current_path);
}
int usb_switch_lock(void)
{
return down_interruptible(&usb_switch_sem);
}
int usb_switch_trylock(void)
{
return down_trylock(&usb_switch_sem);
}
void usb_switch_unlock(void)
{
up(&usb_switch_sem);
}
static int __init usb_switch_init(void)
{
int ret;
gpio_request(GPIO_USB_SEL1, "GPIO_USB_SEL1");
gpio_request(GPIO_UART_SEL, "GPIO_UART_SEL");
gpio_export(GPIO_USB_SEL1, 1);
gpio_export(GPIO_UART_SEL, 1);
BUG_ON(!sec_class);
sec_switch_dev = device_create(sec_class, NULL, 0, NULL, "switch");
BUG_ON(!sec_switch_dev);
gpio_export_link(sec_switch_dev, "GPIO_USB_SEL1", GPIO_USB_SEL1);
gpio_export_link(sec_switch_dev, "GPIO_UART_SEL", GPIO_UART_SEL);
/*init_MUTEX(&usb_switch_sem);*/
sema_init(&usb_switch_sem, 1);
/* create sysfs group */
ret = sysfs_create_group(&sec_switch_dev->kobj, &px_switch_group);
if (ret) {
pr_err("failed to create px switch attribute group\n");
return ret;
}
return 0;
}
device_initcall(usb_switch_init);
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