Merge tag 'mtd/for-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux
[linux-2.6-microblaze.git] / drivers / extcon / extcon-fsa9480.c
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  */
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
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
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
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
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
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
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
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
327 static int fsa9480_remove(struct i2c_client *client)
328 {
329         return 0;
330 }
331
332 #ifdef CONFIG_PM_SLEEP
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
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         { .compatible = "ti,tsu6111", },
368         { },
369 };
370 MODULE_DEVICE_TABLE(of, fsa9480_of_match);
371
372 static struct i2c_driver fsa9480_i2c_driver = {
373         .driver                 = {
374                 .name           = "fsa9480",
375                 .pm             = &fsa9480_pm_ops,
376                 .of_match_table = fsa9480_of_match,
377         },
378         .probe                  = fsa9480_probe,
379         .remove                 = fsa9480_remove,
380         .id_table               = fsa9480_id,
381 };
382
383 static int __init fsa9480_module_init(void)
384 {
385         return i2c_add_driver(&fsa9480_i2c_driver);
386 }
387 subsys_initcall(fsa9480_module_init);
388
389 static void __exit fsa9480_module_exit(void)
390 {
391         i2c_del_driver(&fsa9480_i2c_driver);
392 }
393 module_exit(fsa9480_module_exit);
394
395 MODULE_DESCRIPTION("Fairchild Semiconductor FSA9480 extcon driver");
396 MODULE_AUTHOR("Tomasz Figa <tomasz.figa@gmail.com>");
397 MODULE_LICENSE("GPL");