2 * fsa9480.c - FSA9480 micro USB switch device driver
4 * Copyright (C) 2010 Samsung Electronics
5 * Minkyu Kang <mk7.kang@samsung.com>
6 * Wonguk Jeong <wonguk.jeong@samsung.com>
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.
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>
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
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)
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)
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)
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)
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 INT_DETACH (1 << 1)
97 #define INT_ATTACH (1 << 0)
99 struct fsa9480_usbsw {
100 struct i2c_client *client;
101 struct fsa9480_platform_data *pdata;
107 static struct fsa9480_usbsw *chip;
109 static int fsa9480_write_reg(struct i2c_client *client,
114 ret = i2c_smbus_write_byte_data(client, reg, value);
117 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
122 static int fsa9480_read_reg(struct i2c_client *client, int reg)
126 ret = i2c_smbus_read_byte_data(client, reg);
129 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
134 static int fsa9480_read_irq(struct i2c_client *client, int *value)
138 ret = i2c_smbus_read_i2c_block_data(client,
139 FSA9480_REG_INT1, 2, (u8 *)value);
143 dev_err(&client->dev, "%s: err %d\n", __func__, ret);
148 static void fsa9480_set_switch(const char *buf)
150 struct fsa9480_usbsw *usbsw = chip;
151 struct i2c_client *client = usbsw->client;
153 unsigned int path = 0;
155 value = fsa9480_read_reg(client, FSA9480_REG_CTRL);
157 if (!strncmp(buf, "VAUDIO", 6)) {
159 value &= ~CON_MANUAL_SW;
160 } else if (!strncmp(buf, "UART", 4)) {
162 value &= ~CON_MANUAL_SW;
163 } else if (!strncmp(buf, "AUDIO", 5)) {
165 value &= ~CON_MANUAL_SW;
166 } else if (!strncmp(buf, "DHOST", 5)) {
168 value &= ~CON_MANUAL_SW;
169 } else if (!strncmp(buf, "AUTO", 4)) {
171 value |= CON_MANUAL_SW;
173 printk(KERN_ERR "Wrong command\n");
178 fsa9480_write_reg(client, FSA9480_REG_MANSW1, path);
179 fsa9480_write_reg(client, FSA9480_REG_CTRL, value);
182 static ssize_t fsa9480_get_switch(char *buf)
184 struct fsa9480_usbsw *usbsw = chip;
185 struct i2c_client *client = usbsw->client;
188 value = fsa9480_read_reg(client, FSA9480_REG_MANSW1);
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");
201 return sprintf(buf, "%x", value);
204 static ssize_t fsa9480_show_device(struct device *dev,
205 struct device_attribute *attr,
208 struct fsa9480_usbsw *usbsw = dev_get_drvdata(dev);
209 struct i2c_client *client = usbsw->client;
212 dev1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
213 dev2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
216 return sprintf(buf, "NONE\n");
219 if (dev1 & DEV_T1_USB_MASK || dev2 & DEV_T2_USB_MASK)
220 return sprintf(buf, "USB\n");
223 if (dev1 & DEV_T1_UART_MASK || dev2 & DEV_T2_UART_MASK)
224 return sprintf(buf, "UART\n");
227 if (dev1 & DEV_T1_CHARGER_MASK)
228 return sprintf(buf, "CHARGER\n");
231 if (dev2 & DEV_T2_JIG_MASK)
232 return sprintf(buf, "JIG\n");
234 return sprintf(buf, "UNKNOWN\n");
237 static ssize_t fsa9480_show_manualsw(struct device *dev,
238 struct device_attribute *attr, char *buf)
240 return fsa9480_get_switch(buf);
244 static ssize_t fsa9480_set_manualsw(struct device *dev,
245 struct device_attribute *attr,
246 const char *buf, size_t count)
248 fsa9480_set_switch(buf);
253 static DEVICE_ATTR(device, S_IRUGO, fsa9480_show_device, NULL);
254 static DEVICE_ATTR(switch, S_IRUGO | S_IWUSR,
255 fsa9480_show_manualsw, fsa9480_set_manualsw);
257 static struct attribute *fsa9480_attributes[] = {
258 &dev_attr_device.attr,
259 &dev_attr_switch.attr,
263 static const struct attribute_group fsa9480_group = {
264 .attrs = fsa9480_attributes,
267 static void fsa9480_detect_dev(struct fsa9480_usbsw *usbsw, int intr)
269 int val1, val2, ctrl;
270 struct fsa9480_platform_data *pdata = usbsw->pdata;
271 struct i2c_client *client = usbsw->client;
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);
277 dev_info(&client->dev, "intr: 0x%x, dev1: 0x%x, dev2: 0x%x\n",
283 if (intr & INT_ATTACH) { /* Attached */
285 if (val1 & DEV_T1_USB_MASK || val2 & DEV_T2_USB_MASK) {
287 pdata->usb_cb(FSA9480_ATTACHED);
290 fsa9480_write_reg(client,
291 FSA9480_REG_MANSW1, usbsw->mansw);
296 if (val1 & DEV_T1_UART_MASK || val2 & DEV_T2_UART_MASK) {
298 pdata->uart_cb(FSA9480_ATTACHED);
300 if (!(ctrl & CON_MANUAL_SW)) {
301 fsa9480_write_reg(client,
302 FSA9480_REG_MANSW1, SW_UART);
307 if (val1 & DEV_T1_CHARGER_MASK) {
308 if (pdata->charger_cb)
309 pdata->charger_cb(FSA9480_ATTACHED);
313 if (val2 & DEV_T2_JIG_MASK) {
315 pdata->jig_cb(FSA9480_ATTACHED);
317 } else if (intr & INT_DETACH) { /* Detached */
319 if (usbsw->dev1 & DEV_T1_USB_MASK ||
320 usbsw->dev2 & DEV_T2_USB_MASK) {
322 pdata->usb_cb(FSA9480_DETACHED);
326 if (usbsw->dev1 & DEV_T1_UART_MASK ||
327 usbsw->dev2 & DEV_T2_UART_MASK) {
329 pdata->uart_cb(FSA9480_DETACHED);
333 if (usbsw->dev1 & DEV_T1_CHARGER_MASK) {
334 if (pdata->charger_cb)
335 pdata->charger_cb(FSA9480_DETACHED);
339 if (usbsw->dev2 & DEV_T2_JIG_MASK) {
341 pdata->jig_cb(FSA9480_DETACHED);
349 ctrl &= ~CON_INT_MASK;
350 fsa9480_write_reg(client, FSA9480_REG_CTRL, ctrl);
353 static irqreturn_t fsa9480_irq_handler(int irq, void *data)
355 struct fsa9480_usbsw *usbsw = data;
356 struct i2c_client *client = usbsw->client;
359 /* clear interrupt */
360 fsa9480_read_irq(client, &intr);
362 /* device detection */
363 fsa9480_detect_dev(usbsw, intr);
368 static int fsa9480_irq_init(struct fsa9480_usbsw *usbsw)
370 struct fsa9480_platform_data *pdata = usbsw->pdata;
371 struct i2c_client *client = usbsw->client;
374 unsigned int ctrl = CON_MASK;
376 /* clear interrupt */
377 fsa9480_read_irq(client, &intr);
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);
383 usbsw->mansw = fsa9480_read_reg(client, FSA9480_REG_MANSW1);
386 ctrl &= ~CON_MANUAL_SW; /* Manual Switching Mode */
388 fsa9480_write_reg(client, FSA9480_REG_CTRL, ctrl);
390 if (pdata && pdata->cfg_gpio)
394 ret = request_threaded_irq(client->irq, NULL,
396 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
397 "fsa9480 micro USB", usbsw);
399 dev_err(&client->dev, "failed to reqeust IRQ\n");
404 device_init_wakeup(&client->dev, pdata->wakeup);
410 static int fsa9480_probe(struct i2c_client *client,
411 const struct i2c_device_id *id)
413 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
414 struct fsa9480_usbsw *usbsw;
417 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
420 usbsw = kzalloc(sizeof(struct fsa9480_usbsw), GFP_KERNEL);
422 dev_err(&client->dev, "failed to allocate driver data\n");
426 usbsw->client = client;
427 usbsw->pdata = client->dev.platform_data;
431 i2c_set_clientdata(client, usbsw);
433 ret = fsa9480_irq_init(usbsw);
437 ret = sysfs_create_group(&client->dev.kobj, &fsa9480_group);
439 dev_err(&client->dev,
440 "failed to create fsa9480 attribute group\n");
444 /* ADC Detect Time: 500ms */
445 fsa9480_write_reg(client, FSA9480_REG_TIMING1, 0x6);
447 if (chip->pdata->reset_cb)
448 chip->pdata->reset_cb();
450 /* device detection */
451 fsa9480_detect_dev(usbsw, INT_ATTACH);
453 pm_runtime_set_active(&client->dev);
459 free_irq(client->irq, usbsw);
465 static int fsa9480_remove(struct i2c_client *client)
467 struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
469 free_irq(client->irq, usbsw);
471 sysfs_remove_group(&client->dev.kobj, &fsa9480_group);
472 device_init_wakeup(&client->dev, 0);
479 static int fsa9480_suspend(struct i2c_client *client, pm_message_t state)
481 struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
482 struct fsa9480_platform_data *pdata = usbsw->pdata;
484 if (device_may_wakeup(&client->dev) && client->irq)
485 enable_irq_wake(client->irq);
487 if (pdata->usb_power)
493 static int fsa9480_resume(struct i2c_client *client)
495 struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);
498 if (device_may_wakeup(&client->dev) && client->irq)
499 disable_irq_wake(client->irq);
502 * Clear Pending interrupt. Note that detect_dev does what
503 * the interrupt handler does. So, we don't miss pending and
504 * we reenable interrupt if there is one.
506 fsa9480_read_reg(client, FSA9480_REG_INT1);
507 fsa9480_read_reg(client, FSA9480_REG_INT2);
509 dev1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);
510 dev2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);
512 /* device detection */
513 fsa9480_detect_dev(usbsw, (dev1 || dev2) ? INT_ATTACH : INT_DETACH);
520 #define fsa9480_suspend NULL
521 #define fsa9480_resume NULL
523 #endif /* CONFIG_PM */
525 static const struct i2c_device_id fsa9480_id[] = {
529 MODULE_DEVICE_TABLE(i2c, fsa9480_id);
531 static struct i2c_driver fsa9480_i2c_driver = {
535 .probe = fsa9480_probe,
536 .remove = fsa9480_remove,
537 .resume = fsa9480_resume,
538 .suspend = fsa9480_suspend,
539 .id_table = fsa9480_id,
542 module_i2c_driver(fsa9480_i2c_driver);
544 MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
545 MODULE_DESCRIPTION("FSA9480 USB Switch driver");
546 MODULE_LICENSE("GPL");