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linux/drivers/misc/fsa9480.c

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/*
* fsa9480.c - FSA9480 micro USB switch device driver
*
* Copyright (C) 2010 Samsung Electronics
* Minkyu Kang <mk7.kang@samsung.com>
* Wonguk Jeong <wonguk.jeong@samsung.com>
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_data/fsa9480.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
/* FSA9480 I2C registers */
#define FSA9480_REG_DEVID 0x01
#define FSA9480_REG_CTRL 0x02
#define FSA9480_REG_INT1 0x03
#define FSA9480_REG_INT2 0x04
#define FSA9480_REG_INT1_MASK 0x05
#define FSA9480_REG_INT2_MASK 0x06
#define FSA9480_REG_ADC 0x07
#define FSA9480_REG_TIMING1 0x08
#define FSA9480_REG_TIMING2 0x09
#define FSA9480_REG_DEV_T1 0x0a
#define FSA9480_REG_DEV_T2 0x0b
#define FSA9480_REG_BTN1 0x0c
#define FSA9480_REG_BTN2 0x0d
#define FSA9480_REG_CK 0x0e
#define FSA9480_REG_CK_INT1 0x0f
#define FSA9480_REG_CK_INT2 0x10
#define FSA9480_REG_CK_INTMASK1 0x11
#define FSA9480_REG_CK_INTMASK2 0x12
#define FSA9480_REG_MANSW1 0x13
#define FSA9480_REG_MANSW2 0x14
/* Control */
#define CON_SWITCH_OPEN (1 << 4)
#define CON_RAW_DATA (1 << 3)
#define CON_MANUAL_SW (1 << 2)
#define CON_WAIT (1 << 1)
#define CON_INT_MASK (1 << 0)
#define CON_MASK (CON_SWITCH_OPEN | CON_RAW_DATA | \
CON_MANUAL_SW | CON_WAIT)
/* Device Type 1 */
#define DEV_USB_OTG (1 << 7)
#define DEV_DEDICATED_CHG (1 << 6)
#define DEV_USB_CHG (1 << 5)
#define DEV_CAR_KIT (1 << 4)
#define DEV_UART (1 << 3)
#define DEV_USB (1 << 2)
#define DEV_AUDIO_2 (1 << 1)
#define DEV_AUDIO_1 (1 << 0)
#define DEV_T1_USB_MASK (DEV_USB_OTG | DEV_USB)
#define DEV_T1_UART_MASK (DEV_UART)
#define DEV_T1_CHARGER_MASK (DEV_DEDICATED_CHG | DEV_USB_CHG)
/* Device Type 2 */
#define DEV_AV (1 << 6)
#define DEV_TTY (1 << 5)
#define DEV_PPD (1 << 4)
#define DEV_JIG_UART_OFF (1 << 3)
#define DEV_JIG_UART_ON (1 << 2)
#define DEV_JIG_USB_OFF (1 << 1)
#define DEV_JIG_USB_ON (1 << 0)
#define DEV_T2_USB_MASK (DEV_JIG_USB_OFF | DEV_JIG_USB_ON)
#define DEV_T2_UART_MASK (DEV_JIG_UART_OFF | DEV_JIG_UART_ON)
#define DEV_T2_JIG_MASK (DEV_JIG_USB_OFF | DEV_JIG_USB_ON | \
DEV_JIG_UART_OFF | DEV_JIG_UART_ON)
/*
* Manual Switch
* D- [7:5] / D+ [4:2]
* 000: Open all / 001: USB / 010: AUDIO / 011: UART / 100: V_AUDIO
*/
#define SW_VAUDIO ((4 << 5) | (4 << 2))
#define SW_UART ((3 << 5) | (3 << 2))
#define SW_AUDIO ((2 << 5) | (2 << 2))
#define SW_DHOST ((1 << 5) | (1 << 2))
#define SW_AUTO ((0 << 5) | (0 << 2))
/* Interrupt 1 */
#define INT_DETACH (1 << 1)
#define INT_ATTACH (1 << 0)
struct fsa9480_usbsw {
struct i2c_client *client;
struct fsa9480_platform_data *pdata;
int dev1;
int dev2;
int mansw;
};
static struct fsa9480_usbsw *chip;
static int fsa9480_write_reg(struct i2c_client *client,
int reg, int value)
{
int ret;
ret = i2c_smbus_write_byte_data(client, reg, value);
if (ret < 0)
dev_err(&client->dev, "%s: err %d\n", __func__, ret);
return ret;
}
static int fsa9480_read_reg(struct i2c_client *client, int reg)
{
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0)
dev_err(&client->dev, "%s: err %d\n", __func__, ret);
return ret;
}
static int fsa9480_read_irq(struct i2c_client *client, int *value)
{
int ret;
ret = i2c_smbus_read_i2c_block_data(client,
FSA9480_REG_INT1, 2, (u8 *)value);
*value &= 0xffff;
if (ret < 0)
dev_err(&client->dev, "%s: err %d\n", __func__, ret);
return ret;
}
static void fsa9480_set_switch(const char *buf)
{
struct fsa9480_usbsw *usbsw = chip;
struct i2c_client *client = usbsw->client;
unsigned int value;
unsigned int path = 0;
value = fsa9480_read_reg(client, FSA9480_REG_CTRL);
if (!strncmp(buf, "VAUDIO", 6)) {
path = SW_VAUDIO;
value &= ~CON_MANUAL_SW;
} else if (!strncmp(buf, "UART", 4)) {
path = SW_UART;
value &= ~CON_MANUAL_SW;
} else if (!strncmp(buf, "AUDIO", 5)) {
path = SW_AUDIO;
value &= ~CON_MANUAL_SW;
} else if (!strncmp(buf, "DHOST", 5)) {
path = SW_DHOST;
value &= ~CON_MANUAL_SW;
} else if (!strncmp(buf, "AUTO", 4)) {
path = SW_AUTO;
value |= CON_MANUAL_SW;
} else {
printk(KERN_ERR "Wrong command\n");
return;
}
usbsw->mansw = path;
fsa9480_write_reg(client, FSA9480_REG_MANSW1, path);
fsa9480_write_reg(client, FSA9480_REG_CTRL, value);
}
static ssize_t fsa9480_get_switch(char *buf)
{
struct fsa9480_usbsw *usbsw = chip;
struct i2c_client *client = usbsw->client;
unsigned int value;
value = fsa9480_read_reg(client, FSA9480_REG_MANSW1);
if (value == SW_VAUDIO)
return sprintf(buf, "VAUDIO\n");
else if (value == SW_UART)
return sprintf(buf, "UART\n");
else if (value == SW_AUDIO)
return sprintf(buf, "AUDIO\n");
else if (value == SW_DHOST)
return sprintf(buf, "DHOST\n");
else if (value == SW_AUTO)
return sprintf(buf, "AUTO\n");
else
return sprintf(buf, "%x", value);
}
static ssize_t fsa9480_show_device(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct fsa9480_usbsw *usbsw = dev_get_drvdata(dev);
struct i2c_client *client = usbsw->client;
int dev1, dev2;
dev1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
dev2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
if (!dev1 && !dev2)
return sprintf(buf, "NONE\n");
/* USB */
if (dev1 & DEV_T1_USB_MASK || dev2 & DEV_T2_USB_MASK)
return sprintf(buf, "USB\n");
/* UART */
if (dev1 & DEV_T1_UART_MASK || dev2 & DEV_T2_UART_MASK)
return sprintf(buf, "UART\n");
/* CHARGER */
if (dev1 & DEV_T1_CHARGER_MASK)
return sprintf(buf, "CHARGER\n");
/* JIG */
if (dev2 & DEV_T2_JIG_MASK)
return sprintf(buf, "JIG\n");
return sprintf(buf, "UNKNOWN\n");
}
static ssize_t fsa9480_show_manualsw(struct device *dev,
struct device_attribute *attr, char *buf)
{
return fsa9480_get_switch(buf);
}
static ssize_t fsa9480_set_manualsw(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
fsa9480_set_switch(buf);
return count;
}
static DEVICE_ATTR(device, S_IRUGO, fsa9480_show_device, NULL);
static DEVICE_ATTR(switch, S_IRUGO | S_IWUSR,
fsa9480_show_manualsw, fsa9480_set_manualsw);
static struct attribute *fsa9480_attributes[] = {
&dev_attr_device.attr,
&dev_attr_switch.attr,
NULL
};
static const struct attribute_group fsa9480_group = {
.attrs = fsa9480_attributes,
};
static void fsa9480_detect_dev(struct fsa9480_usbsw *usbsw, int intr)
{
int val1, val2, ctrl;
struct fsa9480_platform_data *pdata = usbsw->pdata;
struct i2c_client *client = usbsw->client;
val1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
val2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
ctrl = fsa9480_read_reg(client, FSA9480_REG_CTRL);
dev_info(&client->dev, "intr: 0x%x, dev1: 0x%x, dev2: 0x%x\n",
intr, val1, val2);
if (!intr)
goto out;
if (intr & INT_ATTACH) { /* Attached */
/* USB */
if (val1 & DEV_T1_USB_MASK || val2 & DEV_T2_USB_MASK) {
if (pdata->usb_cb)
pdata->usb_cb(FSA9480_ATTACHED);
if (usbsw->mansw) {
fsa9480_write_reg(client,
FSA9480_REG_MANSW1, usbsw->mansw);
}
}
/* UART */
if (val1 & DEV_T1_UART_MASK || val2 & DEV_T2_UART_MASK) {
if (pdata->uart_cb)
pdata->uart_cb(FSA9480_ATTACHED);
if (!(ctrl & CON_MANUAL_SW)) {
fsa9480_write_reg(client,
FSA9480_REG_MANSW1, SW_UART);
}
}
/* CHARGER */
if (val1 & DEV_T1_CHARGER_MASK) {
if (pdata->charger_cb)
pdata->charger_cb(FSA9480_ATTACHED);
}
/* JIG */
if (val2 & DEV_T2_JIG_MASK) {
if (pdata->jig_cb)
pdata->jig_cb(FSA9480_ATTACHED);
}
} else if (intr & INT_DETACH) { /* Detached */
/* USB */
if (usbsw->dev1 & DEV_T1_USB_MASK ||
usbsw->dev2 & DEV_T2_USB_MASK) {
if (pdata->usb_cb)
pdata->usb_cb(FSA9480_DETACHED);
}
/* UART */
if (usbsw->dev1 & DEV_T1_UART_MASK ||
usbsw->dev2 & DEV_T2_UART_MASK) {
if (pdata->uart_cb)
pdata->uart_cb(FSA9480_DETACHED);
}
/* CHARGER */
if (usbsw->dev1 & DEV_T1_CHARGER_MASK) {
if (pdata->charger_cb)
pdata->charger_cb(FSA9480_DETACHED);
}
/* JIG */
if (usbsw->dev2 & DEV_T2_JIG_MASK) {
if (pdata->jig_cb)
pdata->jig_cb(FSA9480_DETACHED);
}
}
usbsw->dev1 = val1;
usbsw->dev2 = val2;
out:
ctrl &= ~CON_INT_MASK;
fsa9480_write_reg(client, FSA9480_REG_CTRL, ctrl);
}
static irqreturn_t fsa9480_irq_handler(int irq, void *data)
{
struct fsa9480_usbsw *usbsw = data;
struct i2c_client *client = usbsw->client;
int intr;
/* clear interrupt */
fsa9480_read_irq(client, &intr);
/* device detection */
fsa9480_detect_dev(usbsw, intr);
return IRQ_HANDLED;
}
static int fsa9480_irq_init(struct fsa9480_usbsw *usbsw)
{
struct fsa9480_platform_data *pdata = usbsw->pdata;
struct i2c_client *client = usbsw->client;
int ret;
int intr;
unsigned int ctrl = CON_MASK;
/* clear interrupt */
fsa9480_read_irq(client, &intr);
/* unmask interrupt (attach/detach only) */
fsa9480_write_reg(client, FSA9480_REG_INT1_MASK, 0xfc);
fsa9480_write_reg(client, FSA9480_REG_INT2_MASK, 0x1f);
usbsw->mansw = fsa9480_read_reg(client, FSA9480_REG_MANSW1);
if (usbsw->mansw)
ctrl &= ~CON_MANUAL_SW; /* Manual Switching Mode */
fsa9480_write_reg(client, FSA9480_REG_CTRL, ctrl);
if (pdata && pdata->cfg_gpio)
pdata->cfg_gpio();
if (client->irq) {
ret = request_threaded_irq(client->irq, NULL,
fsa9480_irq_handler,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"fsa9480 micro USB", usbsw);
if (ret) {
dev_err(&client->dev, "failed to reqeust IRQ\n");
return ret;
}
if (pdata)
device_init_wakeup(&client->dev, pdata->wakeup);
}
return 0;
}
static int fsa9480_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct fsa9480_usbsw *usbsw;
int ret = 0;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -EIO;
usbsw = kzalloc(sizeof(struct fsa9480_usbsw), GFP_KERNEL);
if (!usbsw) {
dev_err(&client->dev, "failed to allocate driver data\n");
return -ENOMEM;
}
usbsw->client = client;
usbsw->pdata = client->dev.platform_data;
chip = usbsw;
i2c_set_clientdata(client, usbsw);
ret = fsa9480_irq_init(usbsw);
if (ret)
goto fail1;
ret = sysfs_create_group(&client->dev.kobj, &fsa9480_group);
if (ret) {
dev_err(&client->dev,
"failed to create fsa9480 attribute group\n");
goto fail2;
}
/* ADC Detect Time: 500ms */
fsa9480_write_reg(client, FSA9480_REG_TIMING1, 0x6);
if (chip->pdata->reset_cb)
chip->pdata->reset_cb();
/* device detection */
fsa9480_detect_dev(usbsw, INT_ATTACH);
pm_runtime_set_active(&client->dev);
return 0;
fail2:
if (client->irq)
free_irq(client->irq, usbsw);
fail1:
kfree(usbsw);
return ret;
}
static int fsa9480_remove(struct i2c_client *client)
{
struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
if (client->irq)
free_irq(client->irq, usbsw);
sysfs_remove_group(&client->dev.kobj, &fsa9480_group);
device_init_wakeup(&client->dev, 0);
kfree(usbsw);
return 0;
}
#ifdef CONFIG_PM
static int fsa9480_suspend(struct i2c_client *client, pm_message_t state)
{
struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
struct fsa9480_platform_data *pdata = usbsw->pdata;
if (device_may_wakeup(&client->dev) && client->irq)
enable_irq_wake(client->irq);
if (pdata->usb_power)
pdata->usb_power(0);
return 0;
}
static int fsa9480_resume(struct i2c_client *client)
{
struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
int dev1, dev2;
if (device_may_wakeup(&client->dev) && client->irq)
disable_irq_wake(client->irq);
/*
* Clear Pending interrupt. Note that detect_dev does what
* the interrupt handler does. So, we don't miss pending and
* we reenable interrupt if there is one.
*/
fsa9480_read_reg(client, FSA9480_REG_INT1);
fsa9480_read_reg(client, FSA9480_REG_INT2);
dev1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
dev2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
/* device detection */
fsa9480_detect_dev(usbsw, (dev1 || dev2) ? INT_ATTACH : INT_DETACH);
return 0;
}
#else
#define fsa9480_suspend NULL
#define fsa9480_resume NULL
#endif /* CONFIG_PM */
static const struct i2c_device_id fsa9480_id[] = {
{"fsa9480", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, fsa9480_id);
static struct i2c_driver fsa9480_i2c_driver = {
.driver = {
.name = "fsa9480",
},
.probe = fsa9480_probe,
.remove = fsa9480_remove,
.resume = fsa9480_resume,
.suspend = fsa9480_suspend,
.id_table = fsa9480_id,
};
module_i2c_driver(fsa9480_i2c_driver);
MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
MODULE_DESCRIPTION("FSA9480 USB Switch driver");
MODULE_LICENSE("GPL");
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