1 // SPDX-License-Identifier: GPL-2.0+
3 * extcon-fsa9480.c - Fairchild Semiconductor FSA9480 extcon driver
5 * Copyright (c) 2019 Tomasz Figa <tomasz.figa@gmail.com>
7 * Loosely based on old fsa9480 misc-device driver.
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>
24 /* FSA9480 I2C registers */
25 #define FSA9480_REG_DEVID 0x01
26 #define FSA9480_REG_CTRL 0x02
27 #define FSA9480_REG_INT1 0x03
28 #define FSA9480_REG_INT2 0x04
29 #define FSA9480_REG_INT1_MASK 0x05
30 #define FSA9480_REG_INT2_MASK 0x06
31 #define FSA9480_REG_ADC 0x07
32 #define FSA9480_REG_TIMING1 0x08
33 #define FSA9480_REG_TIMING2 0x09
34 #define FSA9480_REG_DEV_T1 0x0a
35 #define FSA9480_REG_DEV_T2 0x0b
36 #define FSA9480_REG_BTN1 0x0c
37 #define FSA9480_REG_BTN2 0x0d
38 #define FSA9480_REG_CK 0x0e
39 #define FSA9480_REG_CK_INT1 0x0f
40 #define FSA9480_REG_CK_INT2 0x10
41 #define FSA9480_REG_CK_INTMASK1 0x11
42 #define FSA9480_REG_CK_INTMASK2 0x12
43 #define FSA9480_REG_MANSW1 0x13
44 #define FSA9480_REG_MANSW2 0x14
45 #define FSA9480_REG_END 0x15
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)
58 #define DEV_DEDICATED_CHG 6
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)
74 #define DEV_JIG_UART_OFF 11
75 #define DEV_JIG_UART_ON 10
76 #define DEV_JIG_USB_OFF 9
77 #define DEV_JIG_USB_ON 8
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)
87 * 000: Open all / 001: USB / 010: AUDIO / 011: UART / 100: V_AUDIO
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))
96 #define INT1_MASK (0xff << 0)
97 #define INT_DETACH (1 << 1)
98 #define INT_ATTACH (1 << 0)
100 /* Interrupt 2 mask */
101 #define INT2_MASK (0x1f << 0)
104 #define TIMING1_ADC_500MS (0x6 << 0)
106 struct fsa9480_usbsw {
108 struct regmap *regmap;
109 struct extcon_dev *edev;
113 static const unsigned int fsa9480_extcon_cable[] = {
119 EXTCON_JACK_LINE_OUT,
120 EXTCON_JACK_VIDEO_OUT,
126 static 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),
146 /* Define regmap configuration of FSA9480 for I2C communication */
147 static bool fsa9480_volatile_reg(struct device *dev, unsigned int reg)
150 case FSA9480_REG_INT1_MASK:
158 static const struct regmap_config fsa9480_regmap_config = {
161 .volatile_reg = fsa9480_volatile_reg,
162 .max_register = FSA9480_REG_END,
165 static int fsa9480_write_reg(struct fsa9480_usbsw *usbsw, int reg, int value)
169 ret = regmap_write(usbsw->regmap, reg, value);
171 dev_err(usbsw->dev, "%s: err %d\n", __func__, ret);
176 static int fsa9480_read_reg(struct fsa9480_usbsw *usbsw, int reg)
180 ret = regmap_read(usbsw->regmap, reg, &val);
182 dev_err(usbsw->dev, "%s: err %d\n", __func__, ret);
189 static int fsa9480_read_irq(struct fsa9480_usbsw *usbsw, int *value)
194 ret = regmap_bulk_read(usbsw->regmap, FSA9480_REG_INT1, regs, 2);
196 dev_err(usbsw->dev, "%s: err %d\n", __func__, ret);
198 *value = regs[1] << 8 | regs[0];
202 static void fsa9480_handle_change(struct fsa9480_usbsw *usbsw,
203 u16 mask, bool attached)
206 int dev = fls64(mask) - 1;
207 u64 cables = cable_types[dev];
210 int cable = fls64(cables) - 1;
212 extcon_set_state_sync(usbsw->edev, cable, attached);
213 cables &= ~BIT_ULL(cable);
216 mask &= ~BIT_ULL(dev);
220 static void fsa9480_detect_dev(struct fsa9480_usbsw *usbsw)
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__);
231 val = val2 << 8 | val1;
233 dev_info(usbsw->dev, "dev1: 0x%x, dev2: 0x%x\n", val1, val2);
235 /* handle detached cables first */
236 fsa9480_handle_change(usbsw, usbsw->cable & ~val, false);
238 /* then handle attached ones */
239 fsa9480_handle_change(usbsw, val & ~usbsw->cable, true);
244 static irqreturn_t fsa9480_irq_handler(int irq, void *data)
246 struct fsa9480_usbsw *usbsw = data;
249 /* clear interrupt */
250 fsa9480_read_irq(usbsw, &intr);
254 /* device detection */
255 fsa9480_detect_dev(usbsw);
260 static int fsa9480_probe(struct i2c_client *client,
261 const struct i2c_device_id *id)
263 struct fsa9480_usbsw *info;
267 dev_err(&client->dev, "no interrupt provided\n");
271 info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
274 info->dev = &client->dev;
276 i2c_set_clientdata(client, info);
278 /* External connector */
279 info->edev = devm_extcon_dev_allocate(info->dev,
280 fsa9480_extcon_cable);
281 if (IS_ERR(info->edev)) {
282 dev_err(info->dev, "failed to allocate memory for extcon\n");
287 ret = devm_extcon_dev_register(info->dev, info->edev);
289 dev_err(info->dev, "failed to register extcon device\n");
293 info->regmap = devm_regmap_init_i2c(client, &fsa9480_regmap_config);
294 if (IS_ERR(info->regmap)) {
295 ret = PTR_ERR(info->regmap);
296 dev_err(info->dev, "failed to allocate register map: %d\n",
301 /* ADC Detect Time: 500ms */
302 fsa9480_write_reg(info, FSA9480_REG_TIMING1, TIMING1_ADC_500MS);
304 /* configure automatic switching */
305 fsa9480_write_reg(info, FSA9480_REG_CTRL, CON_MASK);
307 /* unmask interrupt (attach/detach only) */
308 fsa9480_write_reg(info, FSA9480_REG_INT1_MASK,
309 INT1_MASK & ~(INT_ATTACH | INT_DETACH));
310 fsa9480_write_reg(info, FSA9480_REG_INT2_MASK, INT2_MASK);
312 ret = devm_request_threaded_irq(info->dev, client->irq, NULL,
314 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
317 dev_err(info->dev, "failed to request IRQ\n");
321 device_init_wakeup(info->dev, true);
322 fsa9480_detect_dev(info);
327 #ifdef CONFIG_PM_SLEEP
328 static int fsa9480_suspend(struct device *dev)
330 struct i2c_client *client = to_i2c_client(dev);
332 if (device_may_wakeup(&client->dev) && client->irq)
333 enable_irq_wake(client->irq);
338 static int fsa9480_resume(struct device *dev)
340 struct i2c_client *client = to_i2c_client(dev);
342 if (device_may_wakeup(&client->dev) && client->irq)
343 disable_irq_wake(client->irq);
349 static const struct dev_pm_ops fsa9480_pm_ops = {
350 SET_SYSTEM_SLEEP_PM_OPS(fsa9480_suspend, fsa9480_resume)
353 static const struct i2c_device_id fsa9480_id[] = {
357 MODULE_DEVICE_TABLE(i2c, fsa9480_id);
359 static const struct of_device_id fsa9480_of_match[] = {
360 { .compatible = "fcs,fsa9480", },
361 { .compatible = "fcs,fsa880", },
362 { .compatible = "ti,tsu6111", },
365 MODULE_DEVICE_TABLE(of, fsa9480_of_match);
367 static struct i2c_driver fsa9480_i2c_driver = {
370 .pm = &fsa9480_pm_ops,
371 .of_match_table = fsa9480_of_match,
373 .probe = fsa9480_probe,
374 .id_table = fsa9480_id,
377 static int __init fsa9480_module_init(void)
379 return i2c_add_driver(&fsa9480_i2c_driver);
381 subsys_initcall(fsa9480_module_init);
383 static void __exit fsa9480_module_exit(void)
385 i2c_del_driver(&fsa9480_i2c_driver);
387 module_exit(fsa9480_module_exit);
389 MODULE_DESCRIPTION("Fairchild Semiconductor FSA9480 extcon driver");
390 MODULE_AUTHOR("Tomasz Figa <tomasz.figa@gmail.com>");
391 MODULE_LICENSE("GPL");