391 lines
10 KiB
C
391 lines
10 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* extcon-fsa9480.c - Fairchild Semiconductor FSA9480 extcon driver
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*
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* Copyright (c) 2019 Tomasz Figa <tomasz.figa@gmail.com>
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*
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* Loosely based on old fsa9480 misc-device driver.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include <linux/interrupt.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/kobject.h>
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#include <linux/extcon-provider.h>
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#include <linux/irqdomain.h>
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#include <linux/regmap.h>
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/* FSA9480 I2C registers */
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#define FSA9480_REG_DEVID 0x01
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#define FSA9480_REG_CTRL 0x02
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#define FSA9480_REG_INT1 0x03
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#define FSA9480_REG_INT2 0x04
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#define FSA9480_REG_INT1_MASK 0x05
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#define FSA9480_REG_INT2_MASK 0x06
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#define FSA9480_REG_ADC 0x07
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#define FSA9480_REG_TIMING1 0x08
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#define FSA9480_REG_TIMING2 0x09
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#define FSA9480_REG_DEV_T1 0x0a
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#define FSA9480_REG_DEV_T2 0x0b
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#define FSA9480_REG_BTN1 0x0c
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#define FSA9480_REG_BTN2 0x0d
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#define FSA9480_REG_CK 0x0e
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#define FSA9480_REG_CK_INT1 0x0f
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#define FSA9480_REG_CK_INT2 0x10
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#define FSA9480_REG_CK_INTMASK1 0x11
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#define FSA9480_REG_CK_INTMASK2 0x12
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#define FSA9480_REG_MANSW1 0x13
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#define FSA9480_REG_MANSW2 0x14
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#define FSA9480_REG_END 0x15
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/* Control */
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#define CON_SWITCH_OPEN (1 << 4)
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#define CON_RAW_DATA (1 << 3)
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#define CON_MANUAL_SW (1 << 2)
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#define CON_WAIT (1 << 1)
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#define CON_INT_MASK (1 << 0)
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#define CON_MASK (CON_SWITCH_OPEN | CON_RAW_DATA | \
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CON_MANUAL_SW | CON_WAIT)
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/* Device Type 1 */
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#define DEV_USB_OTG 7
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#define DEV_DEDICATED_CHG 6
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#define DEV_USB_CHG 5
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#define DEV_CAR_KIT 4
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#define DEV_UART 3
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#define DEV_USB 2
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#define DEV_AUDIO_2 1
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#define DEV_AUDIO_1 0
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#define DEV_T1_USB_MASK (DEV_USB_OTG | DEV_USB)
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#define DEV_T1_UART_MASK (DEV_UART)
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#define DEV_T1_CHARGER_MASK (DEV_DEDICATED_CHG | DEV_USB_CHG)
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/* Device Type 2 */
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#define DEV_AV 14
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#define DEV_TTY 13
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#define DEV_PPD 12
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#define DEV_JIG_UART_OFF 11
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#define DEV_JIG_UART_ON 10
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#define DEV_JIG_USB_OFF 9
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#define DEV_JIG_USB_ON 8
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#define DEV_T2_USB_MASK (DEV_JIG_USB_OFF | DEV_JIG_USB_ON)
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#define DEV_T2_UART_MASK (DEV_JIG_UART_OFF | DEV_JIG_UART_ON)
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#define DEV_T2_JIG_MASK (DEV_JIG_USB_OFF | DEV_JIG_USB_ON | \
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DEV_JIG_UART_OFF | DEV_JIG_UART_ON)
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/*
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* Manual Switch
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* D- [7:5] / D+ [4:2]
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* 000: Open all / 001: USB / 010: AUDIO / 011: UART / 100: V_AUDIO
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*/
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#define SW_VAUDIO ((4 << 5) | (4 << 2))
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#define SW_UART ((3 << 5) | (3 << 2))
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#define SW_AUDIO ((2 << 5) | (2 << 2))
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#define SW_DHOST ((1 << 5) | (1 << 2))
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#define SW_AUTO ((0 << 5) | (0 << 2))
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/* Interrupt 1 */
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#define INT1_MASK (0xff << 0)
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#define INT_DETACH (1 << 1)
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#define INT_ATTACH (1 << 0)
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/* Interrupt 2 mask */
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#define INT2_MASK (0x1f << 0)
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/* Timing Set 1 */
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#define TIMING1_ADC_500MS (0x6 << 0)
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struct fsa9480_usbsw {
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struct device *dev;
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struct regmap *regmap;
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struct extcon_dev *edev;
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u16 cable;
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};
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static const unsigned int fsa9480_extcon_cable[] = {
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EXTCON_USB_HOST,
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EXTCON_USB,
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EXTCON_CHG_USB_DCP,
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EXTCON_CHG_USB_SDP,
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EXTCON_CHG_USB_ACA,
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EXTCON_JACK_LINE_OUT,
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EXTCON_JACK_VIDEO_OUT,
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EXTCON_JIG,
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EXTCON_NONE,
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};
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static const u64 cable_types[] = {
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[DEV_USB_OTG] = BIT_ULL(EXTCON_USB_HOST),
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[DEV_DEDICATED_CHG] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_DCP),
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[DEV_USB_CHG] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP),
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[DEV_CAR_KIT] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP)
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| BIT_ULL(EXTCON_JACK_LINE_OUT),
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[DEV_UART] = BIT_ULL(EXTCON_JIG),
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[DEV_USB] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP),
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[DEV_AUDIO_2] = BIT_ULL(EXTCON_JACK_LINE_OUT),
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[DEV_AUDIO_1] = BIT_ULL(EXTCON_JACK_LINE_OUT),
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[DEV_AV] = BIT_ULL(EXTCON_JACK_LINE_OUT)
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| BIT_ULL(EXTCON_JACK_VIDEO_OUT),
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[DEV_TTY] = BIT_ULL(EXTCON_JIG),
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[DEV_PPD] = BIT_ULL(EXTCON_JACK_LINE_OUT) | BIT_ULL(EXTCON_CHG_USB_ACA),
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[DEV_JIG_UART_OFF] = BIT_ULL(EXTCON_JIG),
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[DEV_JIG_UART_ON] = BIT_ULL(EXTCON_JIG),
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[DEV_JIG_USB_OFF] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_JIG),
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[DEV_JIG_USB_ON] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_JIG),
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};
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/* Define regmap configuration of FSA9480 for I2C communication */
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static bool fsa9480_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case FSA9480_REG_INT1_MASK:
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return true;
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default:
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break;
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}
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return false;
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}
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static const struct regmap_config fsa9480_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.volatile_reg = fsa9480_volatile_reg,
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.max_register = FSA9480_REG_END,
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};
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static int fsa9480_write_reg(struct fsa9480_usbsw *usbsw, int reg, int value)
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{
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int ret;
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ret = regmap_write(usbsw->regmap, reg, value);
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if (ret < 0)
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dev_err(usbsw->dev, "%s: err %d\n", __func__, ret);
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return ret;
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}
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static int fsa9480_read_reg(struct fsa9480_usbsw *usbsw, int reg)
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{
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int ret, val;
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ret = regmap_read(usbsw->regmap, reg, &val);
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if (ret < 0) {
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dev_err(usbsw->dev, "%s: err %d\n", __func__, ret);
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return ret;
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}
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return val;
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}
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static int fsa9480_read_irq(struct fsa9480_usbsw *usbsw, int *value)
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{
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u8 regs[2];
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int ret;
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ret = regmap_bulk_read(usbsw->regmap, FSA9480_REG_INT1, regs, 2);
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if (ret < 0)
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dev_err(usbsw->dev, "%s: err %d\n", __func__, ret);
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*value = regs[1] << 8 | regs[0];
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return ret;
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}
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static void fsa9480_handle_change(struct fsa9480_usbsw *usbsw,
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u16 mask, bool attached)
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{
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while (mask) {
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int dev = fls64(mask) - 1;
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u64 cables = cable_types[dev];
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while (cables) {
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int cable = fls64(cables) - 1;
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extcon_set_state_sync(usbsw->edev, cable, attached);
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cables &= ~BIT_ULL(cable);
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}
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mask &= ~BIT_ULL(dev);
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}
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}
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static void fsa9480_detect_dev(struct fsa9480_usbsw *usbsw)
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{
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int val1, val2;
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u16 val;
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val1 = fsa9480_read_reg(usbsw, FSA9480_REG_DEV_T1);
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val2 = fsa9480_read_reg(usbsw, FSA9480_REG_DEV_T2);
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if (val1 < 0 || val2 < 0) {
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dev_err(usbsw->dev, "%s: failed to read registers", __func__);
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return;
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}
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val = val2 << 8 | val1;
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dev_info(usbsw->dev, "dev1: 0x%x, dev2: 0x%x\n", val1, val2);
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/* handle detached cables first */
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fsa9480_handle_change(usbsw, usbsw->cable & ~val, false);
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/* then handle attached ones */
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fsa9480_handle_change(usbsw, val & ~usbsw->cable, true);
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usbsw->cable = val;
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}
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static irqreturn_t fsa9480_irq_handler(int irq, void *data)
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{
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struct fsa9480_usbsw *usbsw = data;
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int intr = 0;
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/* clear interrupt */
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fsa9480_read_irq(usbsw, &intr);
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if (!intr)
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return IRQ_NONE;
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/* device detection */
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fsa9480_detect_dev(usbsw);
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return IRQ_HANDLED;
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}
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static int fsa9480_probe(struct i2c_client *client)
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{
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struct fsa9480_usbsw *info;
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int ret;
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if (!client->irq) {
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dev_err(&client->dev, "no interrupt provided\n");
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return -EINVAL;
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}
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info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->dev = &client->dev;
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i2c_set_clientdata(client, info);
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/* External connector */
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info->edev = devm_extcon_dev_allocate(info->dev,
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fsa9480_extcon_cable);
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if (IS_ERR(info->edev)) {
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dev_err(info->dev, "failed to allocate memory for extcon\n");
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ret = -ENOMEM;
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return ret;
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}
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ret = devm_extcon_dev_register(info->dev, info->edev);
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if (ret) {
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dev_err(info->dev, "failed to register extcon device\n");
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return ret;
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}
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info->regmap = devm_regmap_init_i2c(client, &fsa9480_regmap_config);
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if (IS_ERR(info->regmap)) {
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ret = PTR_ERR(info->regmap);
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dev_err(info->dev, "failed to allocate register map: %d\n",
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ret);
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return ret;
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}
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/* ADC Detect Time: 500ms */
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fsa9480_write_reg(info, FSA9480_REG_TIMING1, TIMING1_ADC_500MS);
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/* configure automatic switching */
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fsa9480_write_reg(info, FSA9480_REG_CTRL, CON_MASK);
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/* unmask interrupt (attach/detach only) */
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fsa9480_write_reg(info, FSA9480_REG_INT1_MASK,
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INT1_MASK & ~(INT_ATTACH | INT_DETACH));
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fsa9480_write_reg(info, FSA9480_REG_INT2_MASK, INT2_MASK);
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ret = devm_request_threaded_irq(info->dev, client->irq, NULL,
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fsa9480_irq_handler,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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"fsa9480", info);
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if (ret) {
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dev_err(info->dev, "failed to request IRQ\n");
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return ret;
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}
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device_init_wakeup(info->dev, true);
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fsa9480_detect_dev(info);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int fsa9480_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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if (device_may_wakeup(&client->dev) && client->irq)
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enable_irq_wake(client->irq);
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return 0;
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}
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static int fsa9480_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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if (device_may_wakeup(&client->dev) && client->irq)
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disable_irq_wake(client->irq);
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return 0;
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}
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#endif
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static const struct dev_pm_ops fsa9480_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(fsa9480_suspend, fsa9480_resume)
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|
|
};
|
||
|
|
|
||
|
|
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", },
|
||
|
|
{ .compatible = "ti,tsu6111", },
|
||
|
|
{ },
|
||
|
|
};
|
||
|
|
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_new = fsa9480_probe,
|
||
|
|
.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");
|