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linux-next/drivers/extcon/extcon-fsa9480.c
Tomasz Figa bad5b5e707 extcon: Add fsa9480 extcon driver 
This patch adds extcon driver for Fairchild Semiconductor FSA9480
microUSB switch.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2019-06-22 21:34:51 +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", },
{ },
};
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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