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
106 struct fsa9480_usbsw {
107 struct device *dev;
108 struct regmap *regmap;
109 struct extcon_dev *edev;
110 u16 cable;
111 };
112
113 static 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
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),
144 };
145
146 /* Define regmap configuration of FSA9480 for I2C communication */
fsa9480_volatile_reg(struct device * dev,unsigned int reg)147 static 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
158 static 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
fsa9480_write_reg(struct fsa9480_usbsw * usbsw,int reg,int value)165 static 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
fsa9480_read_reg(struct fsa9480_usbsw * usbsw,int reg)176 static 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
fsa9480_read_irq(struct fsa9480_usbsw * usbsw,int * value)189 static 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
fsa9480_handle_change(struct fsa9480_usbsw * usbsw,u16 mask,bool attached)202 static 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
fsa9480_detect_dev(struct fsa9480_usbsw * usbsw)220 static 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
fsa9480_irq_handler(int irq,void * data)244 static 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
fsa9480_probe(struct i2c_client * client,const struct i2c_device_id * id)260 static int fsa9480_probe(struct i2c_client *client,
261 const struct i2c_device_id *id)
262 {
263 struct fsa9480_usbsw *info;
264 int ret;
265
266 if (!client->irq) {
267 dev_err(&client->dev, "no interrupt provided\n");
268 return -EINVAL;
269 }
270
271 info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);
272 if (!info)
273 return -ENOMEM;
274 info->dev = &client->dev;
275
276 i2c_set_clientdata(client, info);
277
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");
283 ret = -ENOMEM;
284 return ret;
285 }
286
287 ret = devm_extcon_dev_register(info->dev, info->edev);
288 if (ret) {
289 dev_err(info->dev, "failed to register extcon device\n");
290 return ret;
291 }
292
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",
297 ret);
298 return ret;
299 }
300
301 /* ADC Detect Time: 500ms */
302 fsa9480_write_reg(info, FSA9480_REG_TIMING1, TIMING1_ADC_500MS);
303
304 /* configure automatic switching */
305 fsa9480_write_reg(info, FSA9480_REG_CTRL, CON_MASK);
306
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);
311
312 ret = devm_request_threaded_irq(info->dev, client->irq, NULL,
313 fsa9480_irq_handler,
314 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
315 "fsa9480", info);
316 if (ret) {
317 dev_err(info->dev, "failed to request IRQ\n");
318 return ret;
319 }
320
321 device_init_wakeup(info->dev, true);
322 fsa9480_detect_dev(info);
323
324 return 0;
325 }
326
fsa9480_remove(struct i2c_client * client)327 static int fsa9480_remove(struct i2c_client *client)
328 {
329 return 0;
330 }
331
332 #ifdef CONFIG_PM_SLEEP
fsa9480_suspend(struct device * dev)333 static int fsa9480_suspend(struct device *dev)
334 {
335 struct i2c_client *client = to_i2c_client(dev);
336
337 if (device_may_wakeup(&client->dev) && client->irq)
338 enable_irq_wake(client->irq);
339
340 return 0;
341 }
342
fsa9480_resume(struct device * dev)343 static int fsa9480_resume(struct device *dev)
344 {
345 struct i2c_client *client = to_i2c_client(dev);
346
347 if (device_may_wakeup(&client->dev) && client->irq)
348 disable_irq_wake(client->irq);
349
350 return 0;
351 }
352 #endif
353
354 static const struct dev_pm_ops fsa9480_pm_ops = {
355 SET_SYSTEM_SLEEP_PM_OPS(fsa9480_suspend, fsa9480_resume)
356 };
357
358 static const struct i2c_device_id fsa9480_id[] = {
359 { "fsa9480", 0 },
360 {}
361 };
362 MODULE_DEVICE_TABLE(i2c, fsa9480_id);
363
364 static const struct of_device_id fsa9480_of_match[] = {
365 { .compatible = "fcs,fsa9480", },
366 { .compatible = "fcs,fsa880", },
367 { },
368 };
369 MODULE_DEVICE_TABLE(of, fsa9480_of_match);
370
371 static struct i2c_driver fsa9480_i2c_driver = {
372 .driver = {
373 .name = "fsa9480",
374 .pm = &fsa9480_pm_ops,
375 .of_match_table = fsa9480_of_match,
376 },
377 .probe = fsa9480_probe,
378 .remove = fsa9480_remove,
379 .id_table = fsa9480_id,
380 };
381
fsa9480_module_init(void)382 static int __init fsa9480_module_init(void)
383 {
384 return i2c_add_driver(&fsa9480_i2c_driver);
385 }
386 subsys_initcall(fsa9480_module_init);
387
fsa9480_module_exit(void)388 static void __exit fsa9480_module_exit(void)
389 {
390 i2c_del_driver(&fsa9480_i2c_driver);
391 }
392 module_exit(fsa9480_module_exit);
393
394 MODULE_DESCRIPTION("Fairchild Semiconductor FSA9480 extcon driver");
395 MODULE_AUTHOR("Tomasz Figa <tomasz.figa@gmail.com>");
396 MODULE_LICENSE("GPL");
397
