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alistair23-linux/drivers/extcon/extcon-fsa9480.c
Linus Walleij 6527c6856f extcon: fsa9480: Support the FSA880 variant 
The older compatible variant of this chip is called FSA880
and works the same way, if we need some quirks in the future,
it is good to let it have its own compatible string.

Cc: devicetree@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2019-07-24 19:10:19 +09:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* extcon-fsa9480.c - Fairchild Semiconductor FSA9480 extcon driver
*
* Copyright (c) 2019 Tomasz Figa <tomasz.figa@gmail.com>
*
* Loosely based on old fsa9480 misc-device driver.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/kobject.h>
#include <linux/extcon-provider.h>
#include <linux/irqdomain.h>
#include <linux/regmap.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
#define FSA9480_REG_END 0x15
/* 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 7
#define DEV_DEDICATED_CHG 6
#define DEV_USB_CHG 5
#define DEV_CAR_KIT 4
#define DEV_UART 3
#define DEV_USB 2
#define DEV_AUDIO_2 1
#define DEV_AUDIO_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 14
#define DEV_TTY 13
#define DEV_PPD 12
#define DEV_JIG_UART_OFF 11
#define DEV_JIG_UART_ON 10
#define DEV_JIG_USB_OFF 9
#define DEV_JIG_USB_ON 8
#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 INT1_MASK (0xff << 0)
#define INT_DETACH (1 << 1)
#define INT_ATTACH (1 << 0)
/* Interrupt 2 mask */
#define INT2_MASK (0x1f << 0)
/* Timing Set 1 */
#define TIMING1_ADC_500MS (0x6 << 0)
struct fsa9480_usbsw {
struct device *dev;
struct regmap *regmap;
struct extcon_dev *edev;
u16 cable;
};
static const unsigned int fsa9480_extcon_cable[] = {
EXTCON_USB_HOST,
EXTCON_USB,
EXTCON_CHG_USB_DCP,
EXTCON_CHG_USB_SDP,
EXTCON_CHG_USB_ACA,
EXTCON_JACK_LINE_OUT,
EXTCON_JACK_VIDEO_OUT,
EXTCON_JIG,
EXTCON_NONE,
};
static const u64 cable_types[] = {
[DEV_USB_OTG] = BIT_ULL(EXTCON_USB_HOST),
[DEV_DEDICATED_CHG] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_DCP),
[DEV_USB_CHG] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP),
[DEV_CAR_KIT] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP)
| BIT_ULL(EXTCON_JACK_LINE_OUT),
[DEV_UART] = BIT_ULL(EXTCON_JIG),
[DEV_USB] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP),
[DEV_AUDIO_2] = BIT_ULL(EXTCON_JACK_LINE_OUT),
[DEV_AUDIO_1] = BIT_ULL(EXTCON_JACK_LINE_OUT),
[DEV_AV] = BIT_ULL(EXTCON_JACK_LINE_OUT)
| BIT_ULL(EXTCON_JACK_VIDEO_OUT),
[DEV_TTY] = BIT_ULL(EXTCON_JIG),
[DEV_PPD] = BIT_ULL(EXTCON_JACK_LINE_OUT) | BIT_ULL(EXTCON_CHG_USB_ACA),
[DEV_JIG_UART_OFF] = BIT_ULL(EXTCON_JIG),
[DEV_JIG_UART_ON] = BIT_ULL(EXTCON_JIG),
[DEV_JIG_USB_OFF] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_JIG),
[DEV_JIG_USB_ON] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_JIG),
};
/* Define regmap configuration of FSA9480 for I2C communication */
static bool fsa9480_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case FSA9480_REG_INT1_MASK:
return true;
default:
break;
}
return false;
}
static const struct regmap_config fsa9480_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_reg = fsa9480_volatile_reg,
.max_register = FSA9480_REG_END,
};
static int fsa9480_write_reg(struct fsa9480_usbsw *usbsw, int reg, int value)
{
int ret;
ret = regmap_write(usbsw->regmap, reg, value);
if (ret < 0)
dev_err(usbsw->dev, "%s: err %d\n", __func__, ret);
return ret;
}
static int fsa9480_read_reg(struct fsa9480_usbsw *usbsw, int reg)
{
int ret, val;
ret = regmap_read(usbsw->regmap, reg, &val);
if (ret < 0) {
dev_err(usbsw->dev, "%s: err %d\n", __func__, ret);
return ret;
}
return val;
}
static int fsa9480_read_irq(struct fsa9480_usbsw *usbsw, int *value)
{
u8 regs[2];
int ret;
ret = regmap_bulk_read(usbsw->regmap, FSA9480_REG_INT1, regs, 2);
if (ret < 0)
dev_err(usbsw->dev, "%s: err %d\n", __func__, ret);
*value = regs[1] << 8 | regs[0];
return ret;
}
static void fsa9480_handle_change(struct fsa9480_usbsw *usbsw,
u16 mask, bool attached)
{
while (mask) {
int dev = fls64(mask) - 1;
u64 cables = cable_types[dev];
while (cables) {
int cable = fls64(cables) - 1;
extcon_set_state_sync(usbsw->edev, cable, attached);
cables &= ~BIT_ULL(cable);
}
mask &= ~BIT_ULL(dev);
}
}
static void fsa9480_detect_dev(struct fsa9480_usbsw *usbsw)
{
int val1, val2;
u16 val;
val1 = fsa9480_read_reg(usbsw, FSA9480_REG_DEV_T1);
val2 = fsa9480_read_reg(usbsw, FSA9480_REG_DEV_T2);
if (val1 < 0 || val2 < 0) {
dev_err(usbsw->dev, "%s: failed to read registers", __func__);
return;
}
val = val2 << 8 | val1;
dev_info(usbsw->dev, "dev1: 0x%x, dev2: 0x%x\n", val1, val2);
/* handle detached cables first */
fsa9480_handle_change(usbsw, usbsw->cable & ~val, false);
/* then handle attached ones */
fsa9480_handle_change(usbsw, val & ~usbsw->cable, true);
usbsw->cable = val;
}
static irqreturn_t fsa9480_irq_handler(int irq, void *data)
{
struct fsa9480_usbsw *usbsw = data;
int intr = 0;
/* clear interrupt */
fsa9480_read_irq(usbsw, &intr);
if (!intr)
return IRQ_NONE;
/* device detection */
fsa9480_detect_dev(usbsw);
return IRQ_HANDLED;
}
static int fsa9480_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct fsa9480_usbsw *info;
int ret;
if (!client->irq) {
dev_err(&client->dev, "no interrupt provided\n");
return -EINVAL;
}
info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->dev = &client->dev;
i2c_set_clientdata(client, info);
/* External connector */
info->edev = devm_extcon_dev_allocate(info->dev,
fsa9480_extcon_cable);
if (IS_ERR(info->edev)) {
dev_err(info->dev, "failed to allocate memory for extcon\n");
ret = -ENOMEM;
return ret;
}
ret = devm_extcon_dev_register(info->dev, info->edev);
if (ret) {
dev_err(info->dev, "failed to register extcon device\n");
return ret;
}
info->regmap = devm_regmap_init_i2c(client, &fsa9480_regmap_config);
if (IS_ERR(info->regmap)) {
ret = PTR_ERR(info->regmap);
dev_err(info->dev, "failed to allocate register map: %d\n",
ret);
return ret;
}
/* ADC Detect Time: 500ms */
fsa9480_write_reg(info, FSA9480_REG_TIMING1, TIMING1_ADC_500MS);
/* configure automatic switching */
fsa9480_write_reg(info, FSA9480_REG_CTRL, CON_MASK);
/* unmask interrupt (attach/detach only) */
fsa9480_write_reg(info, FSA9480_REG_INT1_MASK,
INT1_MASK & ~(INT_ATTACH | INT_DETACH));
fsa9480_write_reg(info, FSA9480_REG_INT2_MASK, INT2_MASK);
ret = devm_request_threaded_irq(info->dev, client->irq, NULL,
fsa9480_irq_handler,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"fsa9480", info);
if (ret) {
dev_err(info->dev, "failed to request IRQ\n");
return ret;
}
device_init_wakeup(info->dev, true);
fsa9480_detect_dev(info);
return 0;
}
static int fsa9480_remove(struct i2c_client *client)
{
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int fsa9480_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
if (device_may_wakeup(&client->dev) && client->irq)
enable_irq_wake(client->irq);
return 0;
}
static int fsa9480_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
if (device_may_wakeup(&client->dev) && client->irq)
disable_irq_wake(client->irq);
return 0;
}
#endif
static const struct dev_pm_ops fsa9480_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(fsa9480_suspend, fsa9480_resume)
};
static const struct i2c_device_id fsa9480_id[] = {
{ "fsa9480", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, fsa9480_id);
static const struct of_device_id fsa9480_of_match[] = {
{ .compatible = "fcs,fsa9480", },
{ .compatible = "fcs,fsa880", },
{ },
};
MODULE_DEVICE_TABLE(of, fsa9480_of_match);
static struct i2c_driver fsa9480_i2c_driver = {
.driver = {
.name = "fsa9480",
.pm = &fsa9480_pm_ops,
.of_match_table = fsa9480_of_match,
},
.probe = fsa9480_probe,
.remove = fsa9480_remove,
.id_table = fsa9480_id,
};
static int __init fsa9480_module_init(void)
{
return i2c_add_driver(&fsa9480_i2c_driver);
}
subsys_initcall(fsa9480_module_init);
static void __exit fsa9480_module_exit(void)
{
i2c_del_driver(&fsa9480_i2c_driver);
}
module_exit(fsa9480_module_exit);
MODULE_DESCRIPTION("Fairchild Semiconductor FSA9480 extcon driver");
MODULE_AUTHOR("Tomasz Figa <tomasz.figa@gmail.com>");
MODULE_LICENSE("GPL");
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