391 lines · c
1// SPDX-License-Identifier: GPL-2.0+2/*3 * extcon-fsa9480.c - Fairchild Semiconductor FSA9480 extcon driver4 *5 * Copyright (c) 2019 Tomasz Figa <tomasz.figa@gmail.com>6 *7 * Loosely based on old fsa9480 misc-device driver.8 */9 10#include <linux/kernel.h>11#include <linux/module.h>12#include <linux/types.h>13#include <linux/i2c.h>14#include <linux/slab.h>15#include <linux/bitops.h>16#include <linux/interrupt.h>17#include <linux/err.h>18#include <linux/platform_device.h>19#include <linux/kobject.h>20#include <linux/extcon-provider.h>21#include <linux/irqdomain.h>22#include <linux/regmap.h>23 24/* FSA9480 I2C registers */25#define FSA9480_REG_DEVID 0x0126#define FSA9480_REG_CTRL 0x0227#define FSA9480_REG_INT1 0x0328#define FSA9480_REG_INT2 0x0429#define FSA9480_REG_INT1_MASK 0x0530#define FSA9480_REG_INT2_MASK 0x0631#define FSA9480_REG_ADC 0x0732#define FSA9480_REG_TIMING1 0x0833#define FSA9480_REG_TIMING2 0x0934#define FSA9480_REG_DEV_T1 0x0a35#define FSA9480_REG_DEV_T2 0x0b36#define FSA9480_REG_BTN1 0x0c37#define FSA9480_REG_BTN2 0x0d38#define FSA9480_REG_CK 0x0e39#define FSA9480_REG_CK_INT1 0x0f40#define FSA9480_REG_CK_INT2 0x1041#define FSA9480_REG_CK_INTMASK1 0x1142#define FSA9480_REG_CK_INTMASK2 0x1243#define FSA9480_REG_MANSW1 0x1344#define FSA9480_REG_MANSW2 0x1445#define FSA9480_REG_END 0x1546 47/* Control */48#define CON_SWITCH_OPEN (1 << 4)49#define CON_RAW_DATA (1 << 3)50#define CON_MANUAL_SW (1 << 2)51#define CON_WAIT (1 << 1)52#define CON_INT_MASK (1 << 0)53#define CON_MASK (CON_SWITCH_OPEN | CON_RAW_DATA | \54 CON_MANUAL_SW | CON_WAIT)55 56/* Device Type 1 */57#define DEV_USB_OTG 758#define DEV_DEDICATED_CHG 659#define DEV_USB_CHG 560#define DEV_CAR_KIT 461#define DEV_UART 362#define DEV_USB 263#define DEV_AUDIO_2 164#define DEV_AUDIO_1 065 66#define DEV_T1_USB_MASK (DEV_USB_OTG | DEV_USB)67#define DEV_T1_UART_MASK (DEV_UART)68#define DEV_T1_CHARGER_MASK (DEV_DEDICATED_CHG | DEV_USB_CHG)69 70/* Device Type 2 */71#define DEV_AV 1472#define DEV_TTY 1373#define DEV_PPD 1274#define DEV_JIG_UART_OFF 1175#define DEV_JIG_UART_ON 1076#define DEV_JIG_USB_OFF 977#define DEV_JIG_USB_ON 878 79#define DEV_T2_USB_MASK (DEV_JIG_USB_OFF | DEV_JIG_USB_ON)80#define DEV_T2_UART_MASK (DEV_JIG_UART_OFF | DEV_JIG_UART_ON)81#define DEV_T2_JIG_MASK (DEV_JIG_USB_OFF | DEV_JIG_USB_ON | \82 DEV_JIG_UART_OFF | DEV_JIG_UART_ON)83 84/*85 * Manual Switch86 * D- [7:5] / D+ [4:2]87 * 000: Open all / 001: USB / 010: AUDIO / 011: UART / 100: V_AUDIO88 */89#define SW_VAUDIO ((4 << 5) | (4 << 2))90#define SW_UART ((3 << 5) | (3 << 2))91#define SW_AUDIO ((2 << 5) | (2 << 2))92#define SW_DHOST ((1 << 5) | (1 << 2))93#define SW_AUTO ((0 << 5) | (0 << 2))94 95/* Interrupt 1 */96#define INT1_MASK (0xff << 0)97#define INT_DETACH (1 << 1)98#define INT_ATTACH (1 << 0)99 100/* Interrupt 2 mask */101#define INT2_MASK (0x1f << 0)102 103/* Timing Set 1 */104#define TIMING1_ADC_500MS (0x6 << 0)105 106struct fsa9480_usbsw {107 struct device *dev;108 struct regmap *regmap;109 struct extcon_dev *edev;110 u16 cable;111};112 113static const unsigned int fsa9480_extcon_cable[] = {114 EXTCON_USB_HOST,115 EXTCON_USB,116 EXTCON_CHG_USB_DCP,117 EXTCON_CHG_USB_SDP,118 EXTCON_CHG_USB_ACA,119 EXTCON_JACK_LINE_OUT,120 EXTCON_JACK_VIDEO_OUT,121 EXTCON_JIG,122 123 EXTCON_NONE,124};125 126static const u64 cable_types[] = {127 [DEV_USB_OTG] = BIT_ULL(EXTCON_USB_HOST),128 [DEV_DEDICATED_CHG] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_DCP),129 [DEV_USB_CHG] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP),130 [DEV_CAR_KIT] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP)131 | BIT_ULL(EXTCON_JACK_LINE_OUT),132 [DEV_UART] = BIT_ULL(EXTCON_JIG),133 [DEV_USB] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP),134 [DEV_AUDIO_2] = BIT_ULL(EXTCON_JACK_LINE_OUT),135 [DEV_AUDIO_1] = BIT_ULL(EXTCON_JACK_LINE_OUT),136 [DEV_AV] = BIT_ULL(EXTCON_JACK_LINE_OUT)137 | BIT_ULL(EXTCON_JACK_VIDEO_OUT),138 [DEV_TTY] = BIT_ULL(EXTCON_JIG),139 [DEV_PPD] = BIT_ULL(EXTCON_JACK_LINE_OUT) | BIT_ULL(EXTCON_CHG_USB_ACA),140 [DEV_JIG_UART_OFF] = BIT_ULL(EXTCON_JIG),141 [DEV_JIG_UART_ON] = BIT_ULL(EXTCON_JIG),142 [DEV_JIG_USB_OFF] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_JIG),143 [DEV_JIG_USB_ON] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_JIG),144};145 146/* Define regmap configuration of FSA9480 for I2C communication */147static bool fsa9480_volatile_reg(struct device *dev, unsigned int reg)148{149 switch (reg) {150 case FSA9480_REG_INT1_MASK:151 return true;152 default:153 break;154 }155 return false;156}157 158static const struct regmap_config fsa9480_regmap_config = {159 .reg_bits = 8,160 .val_bits = 8,161 .volatile_reg = fsa9480_volatile_reg,162 .max_register = FSA9480_REG_END,163};164 165static int fsa9480_write_reg(struct fsa9480_usbsw *usbsw, int reg, int value)166{167 int ret;168 169 ret = regmap_write(usbsw->regmap, reg, value);170 if (ret < 0)171 dev_err(usbsw->dev, "%s: err %d\n", __func__, ret);172 173 return ret;174}175 176static int fsa9480_read_reg(struct fsa9480_usbsw *usbsw, int reg)177{178 int ret, val;179 180 ret = regmap_read(usbsw->regmap, reg, &val);181 if (ret < 0) {182 dev_err(usbsw->dev, "%s: err %d\n", __func__, ret);183 return ret;184 }185 186 return val;187}188 189static int fsa9480_read_irq(struct fsa9480_usbsw *usbsw, int *value)190{191 u8 regs[2];192 int ret;193 194 ret = regmap_bulk_read(usbsw->regmap, FSA9480_REG_INT1, regs, 2);195 if (ret < 0)196 dev_err(usbsw->dev, "%s: err %d\n", __func__, ret);197 198 *value = regs[1] << 8 | regs[0];199 return ret;200}201 202static void fsa9480_handle_change(struct fsa9480_usbsw *usbsw,203 u16 mask, bool attached)204{205 while (mask) {206 int dev = fls64(mask) - 1;207 u64 cables = cable_types[dev];208 209 while (cables) {210 int cable = fls64(cables) - 1;211 212 extcon_set_state_sync(usbsw->edev, cable, attached);213 cables &= ~BIT_ULL(cable);214 }215 216 mask &= ~BIT_ULL(dev);217 }218}219 220static void fsa9480_detect_dev(struct fsa9480_usbsw *usbsw)221{222 int val1, val2;223 u16 val;224 225 val1 = fsa9480_read_reg(usbsw, FSA9480_REG_DEV_T1);226 val2 = fsa9480_read_reg(usbsw, FSA9480_REG_DEV_T2);227 if (val1 < 0 || val2 < 0) {228 dev_err(usbsw->dev, "%s: failed to read registers", __func__);229 return;230 }231 val = val2 << 8 | val1;232 233 dev_info(usbsw->dev, "dev1: 0x%x, dev2: 0x%x\n", val1, val2);234 235 /* handle detached cables first */236 fsa9480_handle_change(usbsw, usbsw->cable & ~val, false);237 238 /* then handle attached ones */239 fsa9480_handle_change(usbsw, val & ~usbsw->cable, true);240 241 usbsw->cable = val;242}243 244static irqreturn_t fsa9480_irq_handler(int irq, void *data)245{246 struct fsa9480_usbsw *usbsw = data;247 int intr = 0;248 249 /* clear interrupt */250 fsa9480_read_irq(usbsw, &intr);251 if (!intr)252 return IRQ_NONE;253 254 /* device detection */255 fsa9480_detect_dev(usbsw);256 257 return IRQ_HANDLED;258}259 260static int fsa9480_probe(struct i2c_client *client)261{262 struct fsa9480_usbsw *info;263 int ret;264 265 if (!client->irq) {266 dev_err(&client->dev, "no interrupt provided\n");267 return -EINVAL;268 }269 270 info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);271 if (!info)272 return -ENOMEM;273 info->dev = &client->dev;274 275 i2c_set_clientdata(client, info);276 277 /* External connector */278 info->edev = devm_extcon_dev_allocate(info->dev,279 fsa9480_extcon_cable);280 if (IS_ERR(info->edev)) {281 dev_err(info->dev, "failed to allocate memory for extcon\n");282 ret = -ENOMEM;283 return ret;284 }285 286 ret = devm_extcon_dev_register(info->dev, info->edev);287 if (ret) {288 dev_err(info->dev, "failed to register extcon device\n");289 return ret;290 }291 292 info->regmap = devm_regmap_init_i2c(client, &fsa9480_regmap_config);293 if (IS_ERR(info->regmap)) {294 ret = PTR_ERR(info->regmap);295 dev_err(info->dev, "failed to allocate register map: %d\n",296 ret);297 return ret;298 }299 300 /* ADC Detect Time: 500ms */301 fsa9480_write_reg(info, FSA9480_REG_TIMING1, TIMING1_ADC_500MS);302 303 /* configure automatic switching */304 fsa9480_write_reg(info, FSA9480_REG_CTRL, CON_MASK);305 306 /* unmask interrupt (attach/detach only) */307 fsa9480_write_reg(info, FSA9480_REG_INT1_MASK,308 INT1_MASK & ~(INT_ATTACH | INT_DETACH));309 fsa9480_write_reg(info, FSA9480_REG_INT2_MASK, INT2_MASK);310 311 ret = devm_request_threaded_irq(info->dev, client->irq, NULL,312 fsa9480_irq_handler,313 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,314 "fsa9480", info);315 if (ret) {316 dev_err(info->dev, "failed to request IRQ\n");317 return ret;318 }319 320 device_init_wakeup(info->dev, true);321 fsa9480_detect_dev(info);322 323 return 0;324}325 326#ifdef CONFIG_PM_SLEEP327static int fsa9480_suspend(struct device *dev)328{329 struct i2c_client *client = to_i2c_client(dev);330 331 if (device_may_wakeup(&client->dev) && client->irq)332 enable_irq_wake(client->irq);333 334 return 0;335}336 337static int fsa9480_resume(struct device *dev)338{339 struct i2c_client *client = to_i2c_client(dev);340 341 if (device_may_wakeup(&client->dev) && client->irq)342 disable_irq_wake(client->irq);343 344 return 0;345}346#endif347 348static const struct dev_pm_ops fsa9480_pm_ops = {349 SET_SYSTEM_SLEEP_PM_OPS(fsa9480_suspend, fsa9480_resume)350};351 352static const struct i2c_device_id fsa9480_id[] = {353 { "fsa9480", 0 },354 {}355};356MODULE_DEVICE_TABLE(i2c, fsa9480_id);357 358static const struct of_device_id fsa9480_of_match[] = {359 { .compatible = "fcs,fsa9480", },360 { .compatible = "fcs,fsa880", },361 { .compatible = "ti,tsu6111", },362 { },363};364MODULE_DEVICE_TABLE(of, fsa9480_of_match);365 366static struct i2c_driver fsa9480_i2c_driver = {367 .driver = {368 .name = "fsa9480",369 .pm = &fsa9480_pm_ops,370 .of_match_table = fsa9480_of_match,371 },372 .probe = fsa9480_probe,373 .id_table = fsa9480_id,374};375 376static int __init fsa9480_module_init(void)377{378 return i2c_add_driver(&fsa9480_i2c_driver);379}380subsys_initcall(fsa9480_module_init);381 382static void __exit fsa9480_module_exit(void)383{384 i2c_del_driver(&fsa9480_i2c_driver);385}386module_exit(fsa9480_module_exit);387 388MODULE_DESCRIPTION("Fairchild Semiconductor FSA9480 extcon driver");389MODULE_AUTHOR("Tomasz Figa <tomasz.figa@gmail.com>");390MODULE_LICENSE("GPL");391