2 * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
4 * Copyright (C) 2012 Samsung Electrnoics
5 * Donggeun Kim <dg77.kim@samsung.com>
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.
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.
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 #include <linux/irqdomain.h>
31 #define DEV_NAME "max8997-muic"
33 /* MAX8997-MUIC STATUS1 register */
34 #define STATUS1_ADC_SHIFT 0
35 #define STATUS1_ADCLOW_SHIFT 5
36 #define STATUS1_ADCERR_SHIFT 6
37 #define STATUS1_ADC_MASK (0x1f << STATUS1_ADC_SHIFT)
38 #define STATUS1_ADCLOW_MASK (0x1 << STATUS1_ADCLOW_SHIFT)
39 #define STATUS1_ADCERR_MASK (0x1 << STATUS1_ADCERR_SHIFT)
41 /* MAX8997-MUIC STATUS2 register */
42 #define STATUS2_CHGTYP_SHIFT 0
43 #define STATUS2_CHGDETRUN_SHIFT 3
44 #define STATUS2_DCDTMR_SHIFT 4
45 #define STATUS2_DBCHG_SHIFT 5
46 #define STATUS2_VBVOLT_SHIFT 6
47 #define STATUS2_CHGTYP_MASK (0x7 << STATUS2_CHGTYP_SHIFT)
48 #define STATUS2_CHGDETRUN_MASK (0x1 << STATUS2_CHGDETRUN_SHIFT)
49 #define STATUS2_DCDTMR_MASK (0x1 << STATUS2_DCDTMR_SHIFT)
50 #define STATUS2_DBCHG_MASK (0x1 << STATUS2_DBCHG_SHIFT)
51 #define STATUS2_VBVOLT_MASK (0x1 << STATUS2_VBVOLT_SHIFT)
53 /* MAX8997-MUIC STATUS3 register */
54 #define STATUS3_OVP_SHIFT 2
55 #define STATUS3_OVP_MASK (0x1 << STATUS3_OVP_SHIFT)
57 /* MAX8997-MUIC CONTROL1 register */
58 #define COMN1SW_SHIFT 0
59 #define COMP2SW_SHIFT 3
60 #define COMN1SW_MASK (0x7 << COMN1SW_SHIFT)
61 #define COMP2SW_MASK (0x7 << COMP2SW_SHIFT)
62 #define SW_MASK (COMP2SW_MASK | COMN1SW_MASK)
64 #define MAX8997_SW_USB ((1 << COMP2SW_SHIFT) | (1 << COMN1SW_SHIFT))
65 #define MAX8997_SW_AUDIO ((2 << COMP2SW_SHIFT) | (2 << COMN1SW_SHIFT))
66 #define MAX8997_SW_UART ((3 << COMP2SW_SHIFT) | (3 << COMN1SW_SHIFT))
67 #define MAX8997_SW_OPEN ((0 << COMP2SW_SHIFT) | (0 << COMN1SW_SHIFT))
69 #define MAX8997_ADC_GROUND 0x00
70 #define MAX8997_ADC_MHL 0x01
71 #define MAX8997_ADC_JIG_USB_1 0x18
72 #define MAX8997_ADC_JIG_USB_2 0x19
73 #define MAX8997_ADC_DESKDOCK 0x1a
74 #define MAX8997_ADC_JIG_UART 0x1c
75 #define MAX8997_ADC_CARDOCK 0x1d
76 #define MAX8997_ADC_OPEN 0x1f
78 struct max8997_muic_irq {
84 static struct max8997_muic_irq muic_irqs[] = {
85 { MAX8997_MUICIRQ_ADCError, "muic-ADC_error" },
86 { MAX8997_MUICIRQ_ADCLow, "muic-ADC_low" },
87 { MAX8997_MUICIRQ_ADC, "muic-ADC" },
88 { MAX8997_MUICIRQ_VBVolt, "muic-VB_voltage" },
89 { MAX8997_MUICIRQ_DBChg, "muic-DB_charger" },
90 { MAX8997_MUICIRQ_DCDTmr, "muic-DCD_timer" },
91 { MAX8997_MUICIRQ_ChgDetRun, "muic-CDR_status" },
92 { MAX8997_MUICIRQ_ChgTyp, "muic-charger_type" },
93 { MAX8997_MUICIRQ_OVP, "muic-over_voltage" },
96 struct max8997_muic_info {
98 struct i2c_client *muic;
99 struct max8997_muic_platform_data *muic_pdata;
102 struct work_struct irq_work;
104 enum max8997_muic_charger_type pre_charger_type;
109 struct extcon_dev *edev;
112 const char *max8997_extcon_cable[] = {
116 [3] = "Fast-charger",
117 [4] = "Slow-charger",
118 [5] = "Charge-downstream",
127 static int max8997_muic_handle_usb(struct max8997_muic_info *info,
128 enum max8997_muic_usb_type usb_type, bool attached)
132 if (usb_type == MAX8997_USB_HOST) {
134 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
135 attached ? MAX8997_SW_USB : MAX8997_SW_OPEN,
138 dev_err(info->dev, "failed to update muic register\n");
144 case MAX8997_USB_HOST:
145 extcon_set_cable_state(info->edev, "USB-Host", attached);
147 case MAX8997_USB_DEVICE:
148 extcon_set_cable_state(info->edev, "USB", attached);
159 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
160 int adc, bool attached)
164 /* switch to AUDIO */
165 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
166 attached ? MAX8997_SW_AUDIO : MAX8997_SW_OPEN,
169 dev_err(info->dev, "failed to update muic register\n");
174 case MAX8997_ADC_DESKDOCK:
175 extcon_set_cable_state(info->edev, "Dock-desk", attached);
177 case MAX8997_ADC_CARDOCK:
178 extcon_set_cable_state(info->edev, "Dock-card", attached);
188 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
194 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
195 attached ? MAX8997_SW_UART : MAX8997_SW_OPEN,
198 dev_err(info->dev, "failed to update muic register\n");
202 extcon_set_cable_state(info->edev, "JIG", attached);
207 static int max8997_muic_handle_adc_detach(struct max8997_muic_info *info)
211 switch (info->pre_adc) {
212 case MAX8997_ADC_GROUND:
213 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, false);
215 case MAX8997_ADC_MHL:
216 extcon_set_cable_state(info->edev, "MHL", false);
218 case MAX8997_ADC_JIG_USB_1:
219 case MAX8997_ADC_JIG_USB_2:
220 ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, false);
222 case MAX8997_ADC_DESKDOCK:
223 case MAX8997_ADC_CARDOCK:
224 ret = max8997_muic_handle_dock(info, info->pre_adc, false);
226 case MAX8997_ADC_JIG_UART:
227 ret = max8997_muic_handle_jig_uart(info, false);
236 static int max8997_muic_handle_adc(struct max8997_muic_info *info, int adc)
241 case MAX8997_ADC_GROUND:
242 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, true);
244 case MAX8997_ADC_MHL:
245 extcon_set_cable_state(info->edev, "MHL", true);
247 case MAX8997_ADC_JIG_USB_1:
248 case MAX8997_ADC_JIG_USB_2:
249 ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, true);
251 case MAX8997_ADC_DESKDOCK:
252 case MAX8997_ADC_CARDOCK:
253 ret = max8997_muic_handle_dock(info, adc, true);
255 case MAX8997_ADC_JIG_UART:
256 ret = max8997_muic_handle_jig_uart(info, true);
258 case MAX8997_ADC_OPEN:
259 ret = max8997_muic_handle_adc_detach(info);
271 static int max8997_muic_handle_charger_type_detach(
272 struct max8997_muic_info *info)
274 switch (info->pre_charger_type) {
275 case MAX8997_CHARGER_TYPE_USB:
276 extcon_set_cable_state(info->edev, "USB", false);
278 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
279 extcon_set_cable_state(info->edev, "Charge-downstream", false);
281 case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
282 extcon_set_cable_state(info->edev, "TA", false);
284 case MAX8997_CHARGER_TYPE_500MA:
285 extcon_set_cable_state(info->edev, "Slow-charger", false);
287 case MAX8997_CHARGER_TYPE_1A:
288 extcon_set_cable_state(info->edev, "Fast-charger", false);
298 static int max8997_muic_handle_charger_type(struct max8997_muic_info *info,
299 enum max8997_muic_charger_type charger_type)
304 ret = max8997_read_reg(info->muic, MAX8997_MUIC_REG_STATUS1, &adc);
306 dev_err(info->dev, "failed to read muic register\n");
310 switch (charger_type) {
311 case MAX8997_CHARGER_TYPE_NONE:
312 ret = max8997_muic_handle_charger_type_detach(info);
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);
320 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
321 extcon_set_cable_state(info->edev, "Charge-downstream", true);
323 case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
324 extcon_set_cable_state(info->edev, "TA", true);
326 case MAX8997_CHARGER_TYPE_500MA:
327 extcon_set_cable_state(info->edev, "Slow-charger", true);
329 case MAX8997_CHARGER_TYPE_1A:
330 extcon_set_cable_state(info->edev, "Fast-charger", true);
337 info->pre_charger_type = charger_type;
342 static void max8997_muic_irq_work(struct work_struct *work)
344 struct max8997_muic_info *info = container_of(work,
345 struct max8997_muic_info, irq_work);
351 mutex_lock(&info->mutex);
353 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
356 dev_err(info->dev, "failed to read muic register\n");
357 mutex_unlock(&info->mutex);
361 dev_dbg(info->dev, "%s: STATUS1:0x%x, 2:0x%x\n", __func__,
362 status[0], status[1]);
364 for (i = 0 ; i < ARRAY_SIZE(muic_irqs) ; i++)
365 if (info->irq == muic_irqs[i].virq)
366 irq_type = muic_irqs[i].irq;
369 case MAX8997_MUICIRQ_ADC:
370 adc = status[0] & STATUS1_ADC_MASK;
371 adc >>= STATUS1_ADC_SHIFT;
373 max8997_muic_handle_adc(info, adc);
375 case MAX8997_MUICIRQ_ChgTyp:
376 chg_type = status[1] & STATUS2_CHGTYP_MASK;
377 chg_type >>= STATUS2_CHGTYP_SHIFT;
379 max8997_muic_handle_charger_type(info, chg_type);
382 dev_info(info->dev, "misc interrupt: irq %d occurred\n",
387 mutex_unlock(&info->mutex);
392 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
394 struct max8997_muic_info *info = data;
396 dev_dbg(info->dev, "irq:%d\n", irq);
399 schedule_work(&info->irq_work);
404 static void max8997_muic_detect_dev(struct max8997_muic_info *info)
407 u8 status[2], adc, chg_type;
409 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
412 dev_err(info->dev, "failed to read muic register\n");
416 dev_info(info->dev, "STATUS1:0x%x, STATUS2:0x%x\n",
417 status[0], status[1]);
419 adc = status[0] & STATUS1_ADC_MASK;
420 adc >>= STATUS1_ADC_SHIFT;
422 chg_type = status[1] & STATUS2_CHGTYP_MASK;
423 chg_type >>= STATUS2_CHGTYP_SHIFT;
425 max8997_muic_handle_adc(info, adc);
426 max8997_muic_handle_charger_type(info, chg_type);
429 static int __devinit max8997_muic_probe(struct platform_device *pdev)
431 struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
432 struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
433 struct max8997_muic_info *info;
436 info = kzalloc(sizeof(struct max8997_muic_info), GFP_KERNEL);
438 dev_err(&pdev->dev, "failed to allocate memory\n");
443 info->dev = &pdev->dev;
444 info->muic = max8997->muic;
446 platform_set_drvdata(pdev, info);
447 mutex_init(&info->mutex);
449 INIT_WORK(&info->irq_work, max8997_muic_irq_work);
451 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
452 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
453 unsigned int virq = 0;
455 virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
460 muic_irq->virq = virq;
462 ret = request_threaded_irq(virq, NULL, max8997_muic_irq_handler,
463 0, muic_irq->name, info);
466 "failed: irq request (IRQ: %d,"
473 /* External connector */
474 info->edev = kzalloc(sizeof(struct extcon_dev), GFP_KERNEL);
476 dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
480 info->edev->name = DEV_NAME;
481 info->edev->supported_cable = max8997_extcon_cable;
482 ret = extcon_dev_register(info->edev, NULL);
484 dev_err(&pdev->dev, "failed to register extcon device\n");
488 /* Initialize registers according to platform data */
489 if (pdata->muic_pdata) {
490 struct max8997_muic_platform_data *mdata = info->muic_pdata;
492 for (i = 0; i < mdata->num_init_data; i++) {
493 max8997_write_reg(info->muic, mdata->init_data[i].addr,
494 mdata->init_data[i].data);
498 /* Initial device detection */
499 max8997_muic_detect_dev(info);
507 free_irq(muic_irqs[i].virq, info);
513 static int __devexit max8997_muic_remove(struct platform_device *pdev)
515 struct max8997_muic_info *info = platform_get_drvdata(pdev);
518 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
519 free_irq(muic_irqs[i].virq, info);
520 cancel_work_sync(&info->irq_work);
522 extcon_dev_unregister(info->edev);
530 static struct platform_driver max8997_muic_driver = {
533 .owner = THIS_MODULE,
535 .probe = max8997_muic_probe,
536 .remove = __devexit_p(max8997_muic_remove),
539 module_platform_driver(max8997_muic_driver);
541 MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
542 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
543 MODULE_LICENSE("GPL");