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1/*
2 * fsa9480.c - FSA9480 micro USB switch device driver
3 *
4 * Copyright (C) 2010 Samsung Electronics
5 * Minkyu Kang <mk7.kang@samsung.com>
6 * Wonguk Jeong <wonguk.jeong@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/err.h>
16#include <linux/i2c.h>
17#include <linux/platform_data/fsa9480.h>
18#include <linux/irq.h>
19#include <linux/interrupt.h>
20#include <linux/workqueue.h>
21#include <linux/platform_device.h>
22#include <linux/slab.h>
23#include <linux/pm_runtime.h>
24
25/* FSA9480 I2C registers */
26#define FSA9480_REG_DEVID 0x01
27#define FSA9480_REG_CTRL 0x02
28#define FSA9480_REG_INT1 0x03
29#define FSA9480_REG_INT2 0x04
30#define FSA9480_REG_INT1_MASK 0x05
31#define FSA9480_REG_INT2_MASK 0x06
32#define FSA9480_REG_ADC 0x07
33#define FSA9480_REG_TIMING1 0x08
34#define FSA9480_REG_TIMING2 0x09
35#define FSA9480_REG_DEV_T1 0x0a
36#define FSA9480_REG_DEV_T2 0x0b
37#define FSA9480_REG_BTN1 0x0c
38#define FSA9480_REG_BTN2 0x0d
39#define FSA9480_REG_CK 0x0e
40#define FSA9480_REG_CK_INT1 0x0f
41#define FSA9480_REG_CK_INT2 0x10
42#define FSA9480_REG_CK_INTMASK1 0x11
43#define FSA9480_REG_CK_INTMASK2 0x12
44#define FSA9480_REG_MANSW1 0x13
45#define FSA9480_REG_MANSW2 0x14
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 (1 << 7)
58#define DEV_DEDICATED_CHG (1 << 6)
59#define DEV_USB_CHG (1 << 5)
60#define DEV_CAR_KIT (1 << 4)
61#define DEV_UART (1 << 3)
62#define DEV_USB (1 << 2)
63#define DEV_AUDIO_2 (1 << 1)
64#define DEV_AUDIO_1 (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 (1 << 6)
72#define DEV_TTY (1 << 5)
73#define DEV_PPD (1 << 4)
74#define DEV_JIG_UART_OFF (1 << 3)
75#define DEV_JIG_UART_ON (1 << 2)
76#define DEV_JIG_USB_OFF (1 << 1)
77#define DEV_JIG_USB_ON (1 << 0)
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 INT_DETACH (1 << 1)
97#define INT_ATTACH (1 << 0)
98
99struct fsa9480_usbsw {
100 struct i2c_client *client;
101 struct fsa9480_platform_data *pdata;
102 int dev1;
103 int dev2;
104 int mansw;
105};
106
107static struct fsa9480_usbsw *chip;
108
109static int fsa9480_write_reg(struct i2c_client *client,
110 int reg, int value)
111{
112 int ret;
113
114 ret = i2c_smbus_write_byte_data(client, reg, value);
115
116 if (ret < 0)
117 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
118
119 return ret;
120}
121
122static int fsa9480_read_reg(struct i2c_client *client, int reg)
123{
124 int ret;
125
126 ret = i2c_smbus_read_byte_data(client, reg);
127
128 if (ret < 0)
129 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
130
131 return ret;
132}
133
134static int fsa9480_read_irq(struct i2c_client *client, int *value)
135{
136 int ret;
137
138 ret = i2c_smbus_read_i2c_block_data(client,
139 FSA9480_REG_INT1, 2, (u8 *)value);
140 *value &= 0xffff;
141
142 if (ret < 0)
143 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
144
145 return ret;
146}
147
148static void fsa9480_set_switch(const char *buf)
149{
150 struct fsa9480_usbsw *usbsw = chip;
151 struct i2c_client *client = usbsw->client;
152 unsigned int value;
153 unsigned int path = 0;
154
155 value = fsa9480_read_reg(client, FSA9480_REG_CTRL);
156
157 if (!strncmp(buf, "VAUDIO", 6)) {
158 path = SW_VAUDIO;
159 value &= ~CON_MANUAL_SW;
160 } else if (!strncmp(buf, "UART", 4)) {
161 path = SW_UART;
162 value &= ~CON_MANUAL_SW;
163 } else if (!strncmp(buf, "AUDIO", 5)) {
164 path = SW_AUDIO;
165 value &= ~CON_MANUAL_SW;
166 } else if (!strncmp(buf, "DHOST", 5)) {
167 path = SW_DHOST;
168 value &= ~CON_MANUAL_SW;
169 } else if (!strncmp(buf, "AUTO", 4)) {
170 path = SW_AUTO;
171 value |= CON_MANUAL_SW;
172 } else {
173 printk(KERN_ERR "Wrong command\n");
174 return;
175 }
176
177 usbsw->mansw = path;
178 fsa9480_write_reg(client, FSA9480_REG_MANSW1, path);
179 fsa9480_write_reg(client, FSA9480_REG_CTRL, value);
180}
181
182static ssize_t fsa9480_get_switch(char *buf)
183{
184 struct fsa9480_usbsw *usbsw = chip;
185 struct i2c_client *client = usbsw->client;
186 unsigned int value;
187
188 value = fsa9480_read_reg(client, FSA9480_REG_MANSW1);
189
190 if (value == SW_VAUDIO)
191 return sprintf(buf, "VAUDIO\n");
192 else if (value == SW_UART)
193 return sprintf(buf, "UART\n");
194 else if (value == SW_AUDIO)
195 return sprintf(buf, "AUDIO\n");
196 else if (value == SW_DHOST)
197 return sprintf(buf, "DHOST\n");
198 else if (value == SW_AUTO)
199 return sprintf(buf, "AUTO\n");
200 else
201 return sprintf(buf, "%x", value);
202}
203
204static ssize_t fsa9480_show_device(struct device *dev,
205 struct device_attribute *attr,
206 char *buf)
207{
208 struct fsa9480_usbsw *usbsw = dev_get_drvdata(dev);
209 struct i2c_client *client = usbsw->client;
210 int dev1, dev2;
211
212 dev1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
213 dev2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
214
215 if (!dev1 && !dev2)
216 return sprintf(buf, "NONE\n");
217
218 /* USB */
219 if (dev1 & DEV_T1_USB_MASK || dev2 & DEV_T2_USB_MASK)
220 return sprintf(buf, "USB\n");
221
222 /* UART */
223 if (dev1 & DEV_T1_UART_MASK || dev2 & DEV_T2_UART_MASK)
224 return sprintf(buf, "UART\n");
225
226 /* CHARGER */
227 if (dev1 & DEV_T1_CHARGER_MASK)
228 return sprintf(buf, "CHARGER\n");
229
230 /* JIG */
231 if (dev2 & DEV_T2_JIG_MASK)
232 return sprintf(buf, "JIG\n");
233
234 return sprintf(buf, "UNKNOWN\n");
235}
236
237static ssize_t fsa9480_show_manualsw(struct device *dev,
238 struct device_attribute *attr, char *buf)
239{
240 return fsa9480_get_switch(buf);
241
242}
243
244static ssize_t fsa9480_set_manualsw(struct device *dev,
245 struct device_attribute *attr,
246 const char *buf, size_t count)
247{
248 fsa9480_set_switch(buf);
249
250 return count;
251}
252
253static DEVICE_ATTR(device, S_IRUGO, fsa9480_show_device, NULL);
254static DEVICE_ATTR(switch, S_IRUGO | S_IWUSR,
255 fsa9480_show_manualsw, fsa9480_set_manualsw);
256
257static struct attribute *fsa9480_attributes[] = {
258 &dev_attr_device.attr,
259 &dev_attr_switch.attr,
260 NULL
261};
262
263static const struct attribute_group fsa9480_group = {
264 .attrs = fsa9480_attributes,
265};
266
267static void fsa9480_detect_dev(struct fsa9480_usbsw *usbsw, int intr)
268{
269 int val1, val2, ctrl;
270 struct fsa9480_platform_data *pdata = usbsw->pdata;
271 struct i2c_client *client = usbsw->client;
272
273 val1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
274 val2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
275 ctrl = fsa9480_read_reg(client, FSA9480_REG_CTRL);
276
277 dev_info(&client->dev, "intr: 0x%x, dev1: 0x%x, dev2: 0x%x\n",
278 intr, val1, val2);
279
280 if (!intr)
281 goto out;
282
283 if (intr & INT_ATTACH) { /* Attached */
284 /* USB */
285 if (val1 & DEV_T1_USB_MASK || val2 & DEV_T2_USB_MASK) {
286 if (pdata->usb_cb)
287 pdata->usb_cb(FSA9480_ATTACHED);
288
289 if (usbsw->mansw) {
290 fsa9480_write_reg(client,
291 FSA9480_REG_MANSW1, usbsw->mansw);
292 }
293 }
294
295 /* UART */
296 if (val1 & DEV_T1_UART_MASK || val2 & DEV_T2_UART_MASK) {
297 if (pdata->uart_cb)
298 pdata->uart_cb(FSA9480_ATTACHED);
299
300 if (!(ctrl & CON_MANUAL_SW)) {
301 fsa9480_write_reg(client,
302 FSA9480_REG_MANSW1, SW_UART);
303 }
304 }
305
306 /* CHARGER */
307 if (val1 & DEV_T1_CHARGER_MASK) {
308 if (pdata->charger_cb)
309 pdata->charger_cb(FSA9480_ATTACHED);
310 }
311
312 /* JIG */
313 if (val2 & DEV_T2_JIG_MASK) {
314 if (pdata->jig_cb)
315 pdata->jig_cb(FSA9480_ATTACHED);
316 }
317 } else if (intr & INT_DETACH) { /* Detached */
318 /* USB */
319 if (usbsw->dev1 & DEV_T1_USB_MASK ||
320 usbsw->dev2 & DEV_T2_USB_MASK) {
321 if (pdata->usb_cb)
322 pdata->usb_cb(FSA9480_DETACHED);
323 }
324
325 /* UART */
326 if (usbsw->dev1 & DEV_T1_UART_MASK ||
327 usbsw->dev2 & DEV_T2_UART_MASK) {
328 if (pdata->uart_cb)
329 pdata->uart_cb(FSA9480_DETACHED);
330 }
331
332 /* CHARGER */
333 if (usbsw->dev1 & DEV_T1_CHARGER_MASK) {
334 if (pdata->charger_cb)
335 pdata->charger_cb(FSA9480_DETACHED);
336 }
337
338 /* JIG */
339 if (usbsw->dev2 & DEV_T2_JIG_MASK) {
340 if (pdata->jig_cb)
341 pdata->jig_cb(FSA9480_DETACHED);
342 }
343 }
344
345 usbsw->dev1 = val1;
346 usbsw->dev2 = val2;
347
348out:
349 ctrl &= ~CON_INT_MASK;
350 fsa9480_write_reg(client, FSA9480_REG_CTRL, ctrl);
351}
352
353static irqreturn_t fsa9480_irq_handler(int irq, void *data)
354{
355 struct fsa9480_usbsw *usbsw = data;
356 struct i2c_client *client = usbsw->client;
357 int intr;
358
359 /* clear interrupt */
360 fsa9480_read_irq(client, &intr);
361
362 /* device detection */
363 fsa9480_detect_dev(usbsw, intr);
364
365 return IRQ_HANDLED;
366}
367
368static int fsa9480_irq_init(struct fsa9480_usbsw *usbsw)
369{
370 struct fsa9480_platform_data *pdata = usbsw->pdata;
371 struct i2c_client *client = usbsw->client;
372 int ret;
373 int intr;
374 unsigned int ctrl = CON_MASK;
375
376 /* clear interrupt */
377 fsa9480_read_irq(client, &intr);
378
379 /* unmask interrupt (attach/detach only) */
380 fsa9480_write_reg(client, FSA9480_REG_INT1_MASK, 0xfc);
381 fsa9480_write_reg(client, FSA9480_REG_INT2_MASK, 0x1f);
382
383 usbsw->mansw = fsa9480_read_reg(client, FSA9480_REG_MANSW1);
384
385 if (usbsw->mansw)
386 ctrl &= ~CON_MANUAL_SW; /* Manual Switching Mode */
387
388 fsa9480_write_reg(client, FSA9480_REG_CTRL, ctrl);
389
390 if (pdata && pdata->cfg_gpio)
391 pdata->cfg_gpio();
392
393 if (client->irq) {
394 ret = request_threaded_irq(client->irq, NULL,
395 fsa9480_irq_handler,
396 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
397 "fsa9480 micro USB", usbsw);
398 if (ret) {
399 dev_err(&client->dev, "failed to reqeust IRQ\n");
400 return ret;
401 }
402
403 device_init_wakeup(&client->dev, pdata->wakeup);
404 }
405
406 return 0;
407}
408
409static int __devinit fsa9480_probe(struct i2c_client *client,
410 const struct i2c_device_id *id)
411{
412 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
413 struct fsa9480_usbsw *usbsw;
414 int ret = 0;
415
416 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
417 return -EIO;
418
419 usbsw = kzalloc(sizeof(struct fsa9480_usbsw), GFP_KERNEL);
420 if (!usbsw) {
421 dev_err(&client->dev, "failed to allocate driver data\n");
422 return -ENOMEM;
423 }
424
425 usbsw->client = client;
426 usbsw->pdata = client->dev.platform_data;
427
428 chip = usbsw;
429
430 i2c_set_clientdata(client, usbsw);
431
432 ret = fsa9480_irq_init(usbsw);
433 if (ret)
434 goto fail1;
435
436 ret = sysfs_create_group(&client->dev.kobj, &fsa9480_group);
437 if (ret) {
438 dev_err(&client->dev,
439 "failed to create fsa9480 attribute group\n");
440 goto fail2;
441 }
442
443 /* ADC Detect Time: 500ms */
444 fsa9480_write_reg(client, FSA9480_REG_TIMING1, 0x6);
445
446 if (chip->pdata->reset_cb)
447 chip->pdata->reset_cb();
448
449 /* device detection */
450 fsa9480_detect_dev(usbsw, INT_ATTACH);
451
452 pm_runtime_set_active(&client->dev);
453
454 return 0;
455
456fail2:
457 if (client->irq)
458 free_irq(client->irq, usbsw);
459fail1:
460 i2c_set_clientdata(client, NULL);
461 kfree(usbsw);
462 return ret;
463}
464
465static int __devexit fsa9480_remove(struct i2c_client *client)
466{
467 struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
468 if (client->irq)
469 free_irq(client->irq, usbsw);
470 i2c_set_clientdata(client, NULL);
471
472 sysfs_remove_group(&client->dev.kobj, &fsa9480_group);
473 device_init_wakeup(&client->dev, 0);
474 kfree(usbsw);
475 return 0;
476}
477
478#ifdef CONFIG_PM
479
480static int fsa9480_suspend(struct i2c_client *client, pm_message_t state)
481{
482 struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
483 struct fsa9480_platform_data *pdata = usbsw->pdata;
484
485 if (device_may_wakeup(&client->dev) && client->irq)
486 enable_irq_wake(client->irq);
487
488 if (pdata->usb_power)
489 pdata->usb_power(0);
490
491 return 0;
492}
493
494static int fsa9480_resume(struct i2c_client *client)
495{
496 struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
497 int dev1, dev2;
498
499 if (device_may_wakeup(&client->dev) && client->irq)
500 disable_irq_wake(client->irq);
501
502 /*
503 * Clear Pending interrupt. Note that detect_dev does what
504 * the interrupt handler does. So, we don't miss pending and
505 * we reenable interrupt if there is one.
506 */
507 fsa9480_read_reg(client, FSA9480_REG_INT1);
508 fsa9480_read_reg(client, FSA9480_REG_INT2);
509
510 dev1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
511 dev2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
512
513 /* device detection */
514 fsa9480_detect_dev(usbsw, (dev1 || dev2) ? INT_ATTACH : INT_DETACH);
515
516 return 0;
517}
518
519#else
520
521#define fsa9480_suspend NULL
522#define fsa9480_resume NULL
523
524#endif /* CONFIG_PM */
525
526static const struct i2c_device_id fsa9480_id[] = {
527 {"fsa9480", 0},
528 {}
529};
530MODULE_DEVICE_TABLE(i2c, fsa9480_id);
531
532static struct i2c_driver fsa9480_i2c_driver = {
533 .driver = {
534 .name = "fsa9480",
535 },
536 .probe = fsa9480_probe,
537 .remove = __devexit_p(fsa9480_remove),
538 .resume = fsa9480_resume,
539 .suspend = fsa9480_suspend,
540 .id_table = fsa9480_id,
541};
542
543static int __init fsa9480_init(void)
544{
545 return i2c_add_driver(&fsa9480_i2c_driver);
546}
547module_init(fsa9480_init);
548
549static void __exit fsa9480_exit(void)
550{
551 i2c_del_driver(&fsa9480_i2c_driver);
552}
553module_exit(fsa9480_exit);
554
555MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
556MODULE_DESCRIPTION("FSA9480 USB Switch driver");
557MODULE_LICENSE("GPL");