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1/*
2 * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
3 *
4 * Copyright (C) 2012 Samsung Electrnoics
5 * Donggeun Kim <dg77.kim@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/i2c.h>
21#include <linux/slab.h>
22#include <linux/interrupt.h>
23#include <linux/err.h>
24#include <linux/platform_device.h>
25#include <linux/kobject.h>
26#include <linux/mfd/max8997.h>
27#include <linux/mfd/max8997-private.h>
28#include <linux/extcon.h>
29
30#define DEV_NAME "max8997-muic"
31
32/* MAX8997-MUIC STATUS1 register */
33#define STATUS1_ADC_SHIFT 0
34#define STATUS1_ADCLOW_SHIFT 5
35#define STATUS1_ADCERR_SHIFT 6
36#define STATUS1_ADC_MASK (0x1f << STATUS1_ADC_SHIFT)
37#define STATUS1_ADCLOW_MASK (0x1 << STATUS1_ADCLOW_SHIFT)
38#define STATUS1_ADCERR_MASK (0x1 << STATUS1_ADCERR_SHIFT)
39
40/* MAX8997-MUIC STATUS2 register */
41#define STATUS2_CHGTYP_SHIFT 0
42#define STATUS2_CHGDETRUN_SHIFT 3
43#define STATUS2_DCDTMR_SHIFT 4
44#define STATUS2_DBCHG_SHIFT 5
45#define STATUS2_VBVOLT_SHIFT 6
46#define STATUS2_CHGTYP_MASK (0x7 << STATUS2_CHGTYP_SHIFT)
47#define STATUS2_CHGDETRUN_MASK (0x1 << STATUS2_CHGDETRUN_SHIFT)
48#define STATUS2_DCDTMR_MASK (0x1 << STATUS2_DCDTMR_SHIFT)
49#define STATUS2_DBCHG_MASK (0x1 << STATUS2_DBCHG_SHIFT)
50#define STATUS2_VBVOLT_MASK (0x1 << STATUS2_VBVOLT_SHIFT)
51
52/* MAX8997-MUIC STATUS3 register */
53#define STATUS3_OVP_SHIFT 2
54#define STATUS3_OVP_MASK (0x1 << STATUS3_OVP_SHIFT)
55
56/* MAX8997-MUIC CONTROL1 register */
57#define COMN1SW_SHIFT 0
58#define COMP2SW_SHIFT 3
59#define COMN1SW_MASK (0x7 << COMN1SW_SHIFT)
60#define COMP2SW_MASK (0x7 << COMP2SW_SHIFT)
61#define SW_MASK (COMP2SW_MASK | COMN1SW_MASK)
62
63#define MAX8997_SW_USB ((1 << COMP2SW_SHIFT) | (1 << COMN1SW_SHIFT))
64#define MAX8997_SW_AUDIO ((2 << COMP2SW_SHIFT) | (2 << COMN1SW_SHIFT))
65#define MAX8997_SW_UART ((3 << COMP2SW_SHIFT) | (3 << COMN1SW_SHIFT))
66#define MAX8997_SW_OPEN ((0 << COMP2SW_SHIFT) | (0 << COMN1SW_SHIFT))
67
68#define MAX8997_ADC_GROUND 0x00
69#define MAX8997_ADC_MHL 0x01
70#define MAX8997_ADC_JIG_USB_1 0x18
71#define MAX8997_ADC_JIG_USB_2 0x19
72#define MAX8997_ADC_DESKDOCK 0x1a
73#define MAX8997_ADC_JIG_UART 0x1c
74#define MAX8997_ADC_CARDOCK 0x1d
75#define MAX8997_ADC_OPEN 0x1f
76
77struct max8997_muic_irq {
78 unsigned int irq;
79 const char *name;
80};
81
82static struct max8997_muic_irq muic_irqs[] = {
83 { MAX8997_MUICIRQ_ADCError, "muic-ADC_error" },
84 { MAX8997_MUICIRQ_ADCLow, "muic-ADC_low" },
85 { MAX8997_MUICIRQ_ADC, "muic-ADC" },
86 { MAX8997_MUICIRQ_VBVolt, "muic-VB_voltage" },
87 { MAX8997_MUICIRQ_DBChg, "muic-DB_charger" },
88 { MAX8997_MUICIRQ_DCDTmr, "muic-DCD_timer" },
89 { MAX8997_MUICIRQ_ChgDetRun, "muic-CDR_status" },
90 { MAX8997_MUICIRQ_ChgTyp, "muic-charger_type" },
91 { MAX8997_MUICIRQ_OVP, "muic-over_voltage" },
92};
93
94struct max8997_muic_info {
95 struct device *dev;
96 struct i2c_client *muic;
97 struct max8997_muic_platform_data *muic_pdata;
98
99 int irq;
100 struct work_struct irq_work;
101
102 enum max8997_muic_charger_type pre_charger_type;
103 int pre_adc;
104
105 struct mutex mutex;
106
107 struct extcon_dev *edev;
108};
109
110const char *max8997_extcon_cable[] = {
111 [0] = "USB",
112 [1] = "USB-Host",
113 [2] = "TA",
114 [3] = "Fast-charger",
115 [4] = "Slow-charger",
116 [5] = "Charge-downstream",
117 [6] = "MHL",
118 [7] = "Dock-desk",
119 [8] = "Dock-card",
120 [9] = "JIG",
121
122 NULL,
123};
124
125static int max8997_muic_handle_usb(struct max8997_muic_info *info,
126 enum max8997_muic_usb_type usb_type, bool attached)
127{
128 int ret = 0;
129
130 if (usb_type == MAX8997_USB_HOST) {
131 /* switch to USB */
132 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
133 attached ? MAX8997_SW_USB : MAX8997_SW_OPEN,
134 SW_MASK);
135 if (ret) {
136 dev_err(info->dev, "failed to update muic register\n");
137 goto out;
138 }
139 }
140
141 switch (usb_type) {
142 case MAX8997_USB_HOST:
143 extcon_set_cable_state(info->edev, "USB-Host", attached);
144 break;
145 case MAX8997_USB_DEVICE:
146 extcon_set_cable_state(info->edev, "USB", attached);
147 break;
148 default:
149 ret = -EINVAL;
150 break;
151 }
152
153out:
154 return ret;
155}
156
157static int max8997_muic_handle_dock(struct max8997_muic_info *info,
158 int adc, bool attached)
159{
160 int ret = 0;
161
162 /* switch to AUDIO */
163 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
164 attached ? MAX8997_SW_AUDIO : MAX8997_SW_OPEN,
165 SW_MASK);
166 if (ret) {
167 dev_err(info->dev, "failed to update muic register\n");
168 goto out;
169 }
170
171 switch (adc) {
172 case MAX8997_ADC_DESKDOCK:
173 extcon_set_cable_state(info->edev, "Dock-desk", attached);
174 break;
175 case MAX8997_ADC_CARDOCK:
176 extcon_set_cable_state(info->edev, "Dock-card", attached);
177 break;
178 default:
179 ret = -EINVAL;
180 break;
181 }
182out:
183 return ret;
184}
185
186static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
187 bool attached)
188{
189 int ret = 0;
190
191 /* switch to UART */
192 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
193 attached ? MAX8997_SW_UART : MAX8997_SW_OPEN,
194 SW_MASK);
195 if (ret) {
196 dev_err(info->dev, "failed to update muic register\n");
197 goto out;
198 }
199
200 extcon_set_cable_state(info->edev, "JIG", attached);
201out:
202 return ret;
203}
204
205static int max8997_muic_handle_adc_detach(struct max8997_muic_info *info)
206{
207 int ret = 0;
208
209 switch (info->pre_adc) {
210 case MAX8997_ADC_GROUND:
211 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, false);
212 break;
213 case MAX8997_ADC_MHL:
214 extcon_set_cable_state(info->edev, "MHL", false);
215 break;
216 case MAX8997_ADC_JIG_USB_1:
217 case MAX8997_ADC_JIG_USB_2:
218 ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, false);
219 break;
220 case MAX8997_ADC_DESKDOCK:
221 case MAX8997_ADC_CARDOCK:
222 ret = max8997_muic_handle_dock(info, info->pre_adc, false);
223 break;
224 case MAX8997_ADC_JIG_UART:
225 ret = max8997_muic_handle_jig_uart(info, false);
226 break;
227 default:
228 break;
229 }
230
231 return ret;
232}
233
234static int max8997_muic_handle_adc(struct max8997_muic_info *info, int adc)
235{
236 int ret = 0;
237
238 switch (adc) {
239 case MAX8997_ADC_GROUND:
240 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, true);
241 break;
242 case MAX8997_ADC_MHL:
243 extcon_set_cable_state(info->edev, "MHL", true);
244 break;
245 case MAX8997_ADC_JIG_USB_1:
246 case MAX8997_ADC_JIG_USB_2:
247 ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, true);
248 break;
249 case MAX8997_ADC_DESKDOCK:
250 case MAX8997_ADC_CARDOCK:
251 ret = max8997_muic_handle_dock(info, adc, true);
252 break;
253 case MAX8997_ADC_JIG_UART:
254 ret = max8997_muic_handle_jig_uart(info, true);
255 break;
256 case MAX8997_ADC_OPEN:
257 ret = max8997_muic_handle_adc_detach(info);
258 break;
259 default:
260 ret = -EINVAL;
261 goto out;
262 }
263
264 info->pre_adc = adc;
265out:
266 return ret;
267}
268
269static int max8997_muic_handle_charger_type_detach(
270 struct max8997_muic_info *info)
271{
272 int ret = 0;
273
274 switch (info->pre_charger_type) {
275 case MAX8997_CHARGER_TYPE_USB:
276 extcon_set_cable_state(info->edev, "USB", false);
277 break;
278 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
279 extcon_set_cable_state(info->edev, "Charge-downstream", false);
280 break;
281 case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
282 extcon_set_cable_state(info->edev, "TA", false);
283 break;
284 case MAX8997_CHARGER_TYPE_500MA:
285 extcon_set_cable_state(info->edev, "Slow-charger", false);
286 break;
287 case MAX8997_CHARGER_TYPE_1A:
288 extcon_set_cable_state(info->edev, "Fast-charger", false);
289 break;
290 default:
291 ret = -EINVAL;
292 break;
293 }
294
295 return ret;
296}
297
298static int max8997_muic_handle_charger_type(struct max8997_muic_info *info,
299 enum max8997_muic_charger_type charger_type)
300{
301 u8 adc;
302 int ret;
303
304 ret = max8997_read_reg(info->muic, MAX8997_MUIC_REG_STATUS1, &adc);
305 if (ret) {
306 dev_err(info->dev, "failed to read muic register\n");
307 goto out;
308 }
309
310 switch (charger_type) {
311 case MAX8997_CHARGER_TYPE_NONE:
312 ret = max8997_muic_handle_charger_type_detach(info);
313 break;
314 case MAX8997_CHARGER_TYPE_USB:
315 if ((adc & STATUS1_ADC_MASK) == MAX8997_ADC_OPEN) {
316 max8997_muic_handle_usb(info,
317 MAX8997_USB_DEVICE, true);
318 }
319 break;
320 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
321 extcon_set_cable_state(info->edev, "Charge-downstream", true);
322 break;
323 case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
324 extcon_set_cable_state(info->edev, "TA", true);
325 break;
326 case MAX8997_CHARGER_TYPE_500MA:
327 extcon_set_cable_state(info->edev, "Slow-charger", true);
328 break;
329 case MAX8997_CHARGER_TYPE_1A:
330 extcon_set_cable_state(info->edev, "Fast-charger", true);
331 break;
332 default:
333 ret = -EINVAL;
334 goto out;
335 }
336
337 info->pre_charger_type = charger_type;
338out:
339 return ret;
340}
341
342static void max8997_muic_irq_work(struct work_struct *work)
343{
344 struct max8997_muic_info *info = container_of(work,
345 struct max8997_muic_info, irq_work);
346 struct max8997_dev *max8997 = i2c_get_clientdata(info->muic);
347 u8 status[2];
348 u8 adc, chg_type;
349
350 int irq_type = info->irq - max8997->irq_base;
351 int ret;
352
353 mutex_lock(&info->mutex);
354
355 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
356 2, status);
357 if (ret) {
358 dev_err(info->dev, "failed to read muic register\n");
359 mutex_unlock(&info->mutex);
360 return;
361 }
362
363 dev_dbg(info->dev, "%s: STATUS1:0x%x, 2:0x%x\n", __func__,
364 status[0], status[1]);
365
366 switch (irq_type) {
367 case MAX8997_MUICIRQ_ADC:
368 adc = status[0] & STATUS1_ADC_MASK;
369 adc >>= STATUS1_ADC_SHIFT;
370
371 max8997_muic_handle_adc(info, adc);
372 break;
373 case MAX8997_MUICIRQ_ChgTyp:
374 chg_type = status[1] & STATUS2_CHGTYP_MASK;
375 chg_type >>= STATUS2_CHGTYP_SHIFT;
376
377 max8997_muic_handle_charger_type(info, chg_type);
378 break;
379 default:
380 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
381 irq_type);
382 break;
383 }
384
385 mutex_unlock(&info->mutex);
386
387 return;
388}
389
390static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
391{
392 struct max8997_muic_info *info = data;
393
394 dev_dbg(info->dev, "irq:%d\n", irq);
395 info->irq = irq;
396
397 schedule_work(&info->irq_work);
398
399 return IRQ_HANDLED;
400}
401
402static void max8997_muic_detect_dev(struct max8997_muic_info *info)
403{
404 int ret;
405 u8 status[2], adc, chg_type;
406
407 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
408 2, status);
409 if (ret) {
410 dev_err(info->dev, "failed to read muic register\n");
411 return;
412 }
413
414 dev_info(info->dev, "STATUS1:0x%x, STATUS2:0x%x\n",
415 status[0], status[1]);
416
417 adc = status[0] & STATUS1_ADC_MASK;
418 adc >>= STATUS1_ADC_SHIFT;
419
420 chg_type = status[1] & STATUS2_CHGTYP_MASK;
421 chg_type >>= STATUS2_CHGTYP_SHIFT;
422
423 max8997_muic_handle_adc(info, adc);
424 max8997_muic_handle_charger_type(info, chg_type);
425}
426
427static int __devinit max8997_muic_probe(struct platform_device *pdev)
428{
429 struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
430 struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
431 struct max8997_muic_info *info;
432 int ret, i;
433
434 info = kzalloc(sizeof(struct max8997_muic_info), GFP_KERNEL);
435 if (!info) {
436 dev_err(&pdev->dev, "failed to allocate memory\n");
437 ret = -ENOMEM;
438 goto err_kfree;
439 }
440
441 info->dev = &pdev->dev;
442 info->muic = max8997->muic;
443
444 platform_set_drvdata(pdev, info);
445 mutex_init(&info->mutex);
446
447 INIT_WORK(&info->irq_work, max8997_muic_irq_work);
448
449 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
450 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
451
452 ret = request_threaded_irq(pdata->irq_base + muic_irq->irq,
453 NULL, max8997_muic_irq_handler,
454 0, muic_irq->name,
455 info);
456 if (ret) {
457 dev_err(&pdev->dev,
458 "failed: irq request (IRQ: %d,"
459 " error :%d)\n",
460 muic_irq->irq, ret);
461 goto err_irq;
462 }
463 }
464
465 /* External connector */
466 info->edev = kzalloc(sizeof(struct extcon_dev), GFP_KERNEL);
467 if (!info->edev) {
468 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
469 ret = -ENOMEM;
470 goto err_irq;
471 }
472 info->edev->name = DEV_NAME;
473 info->edev->supported_cable = max8997_extcon_cable;
474 ret = extcon_dev_register(info->edev, NULL);
475 if (ret) {
476 dev_err(&pdev->dev, "failed to register extcon device\n");
477 goto err_extcon;
478 }
479
480 /* Initialize registers according to platform data */
481 if (pdata->muic_pdata) {
482 struct max8997_muic_platform_data *mdata = info->muic_pdata;
483
484 for (i = 0; i < mdata->num_init_data; i++) {
485 max8997_write_reg(info->muic, mdata->init_data[i].addr,
486 mdata->init_data[i].data);
487 }
488 }
489
490 /* Initial device detection */
491 max8997_muic_detect_dev(info);
492
493 return ret;
494
495err_extcon:
496 kfree(info->edev);
497err_irq:
498 while (--i >= 0)
499 free_irq(pdata->irq_base + muic_irqs[i].irq, info);
500 kfree(info);
501err_kfree:
502 return ret;
503}
504
505static int __devexit max8997_muic_remove(struct platform_device *pdev)
506{
507 struct max8997_muic_info *info = platform_get_drvdata(pdev);
508 struct max8997_dev *max8997 = i2c_get_clientdata(info->muic);
509 int i;
510
511 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
512 free_irq(max8997->irq_base + muic_irqs[i].irq, info);
513 cancel_work_sync(&info->irq_work);
514
515 extcon_dev_unregister(info->edev);
516
517 kfree(info->edev);
518 kfree(info);
519
520 return 0;
521}
522
523static struct platform_driver max8997_muic_driver = {
524 .driver = {
525 .name = DEV_NAME,
526 .owner = THIS_MODULE,
527 },
528 .probe = max8997_muic_probe,
529 .remove = __devexit_p(max8997_muic_remove),
530};
531
532module_platform_driver(max8997_muic_driver);
533
534MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
535MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
536MODULE_LICENSE("GPL");