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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * extcon-fsa9480.c - Fairchild Semiconductor FSA9480 extcon driver
4 *
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 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
46
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 7
58#define DEV_DEDICATED_CHG 6
59#define DEV_USB_CHG 5
60#define DEV_CAR_KIT 4
61#define DEV_UART 3
62#define DEV_USB 2
63#define DEV_AUDIO_2 1
64#define DEV_AUDIO_1 0
65
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 14
72#define DEV_TTY 13
73#define DEV_PPD 12
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
78
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 Switch
86 * D- [7:5] / D+ [4:2]
87 * 000: Open all / 001: USB / 010: AUDIO / 011: UART / 100: V_AUDIO
88 */
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_SLEEP
327static 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#endif
347
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");