2 * max8997-muic.c - MAX8997 muic driver for the Maxim 8997
4 * Copyright (C) 2011 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.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/i2c.h>
26 #include <linux/slab.h>
27 #include <linux/interrupt.h>
28 #include <linux/err.h>
29 #include <linux/platform_device.h>
30 #include <linux/kobject.h>
31 #include <linux/mfd/max8997.h>
32 #include <linux/mfd/max8997-private.h>
34 /* MAX8997-MUIC STATUS1 register */
35 #define STATUS1_ADC_SHIFT 0
36 #define STATUS1_ADCLOW_SHIFT 5
37 #define STATUS1_ADCERR_SHIFT 6
38 #define STATUS1_ADC_MASK (0x1f << STATUS1_ADC_SHIFT)
39 #define STATUS1_ADCLOW_MASK (0x1 << STATUS1_ADCLOW_SHIFT)
40 #define STATUS1_ADCERR_MASK (0x1 << STATUS1_ADCERR_SHIFT)
42 /* MAX8997-MUIC STATUS2 register */
43 #define STATUS2_CHGTYP_SHIFT 0
44 #define STATUS2_CHGDETRUN_SHIFT 3
45 #define STATUS2_DCDTMR_SHIFT 4
46 #define STATUS2_DBCHG_SHIFT 5
47 #define STATUS2_VBVOLT_SHIFT 6
48 #define STATUS2_CHGTYP_MASK (0x7 << STATUS2_CHGTYP_SHIFT)
49 #define STATUS2_CHGDETRUN_MASK (0x1 << STATUS2_CHGDETRUN_SHIFT)
50 #define STATUS2_DCDTMR_MASK (0x1 << STATUS2_DCDTMR_SHIFT)
51 #define STATUS2_DBCHG_MASK (0x1 << STATUS2_DBCHG_SHIFT)
52 #define STATUS2_VBVOLT_MASK (0x1 << STATUS2_VBVOLT_SHIFT)
54 /* MAX8997-MUIC STATUS3 register */
55 #define STATUS3_OVP_SHIFT 2
56 #define STATUS3_OVP_MASK (0x1 << STATUS3_OVP_SHIFT)
58 /* MAX8997-MUIC CONTROL1 register */
59 #define COMN1SW_SHIFT 0
60 #define COMP2SW_SHIFT 3
61 #define COMN1SW_MASK (0x7 << COMN1SW_SHIFT)
62 #define COMP2SW_MASK (0x7 << COMP2SW_SHIFT)
63 #define SW_MASK (COMP2SW_MASK | COMN1SW_MASK)
65 #define MAX8997_SW_USB ((1 << COMP2SW_SHIFT) | (1 << COMN1SW_SHIFT))
66 #define MAX8997_SW_AUDIO ((2 << COMP2SW_SHIFT) | (2 << COMN1SW_SHIFT))
67 #define MAX8997_SW_UART ((3 << COMP2SW_SHIFT) | (3 << COMN1SW_SHIFT))
68 #define MAX8997_SW_OPEN ((0 << COMP2SW_SHIFT) | (0 << COMN1SW_SHIFT))
70 #define MAX8997_ADC_GROUND 0x00
71 #define MAX8997_ADC_MHL 0x01
72 #define MAX8997_ADC_JIG_USB_1 0x18
73 #define MAX8997_ADC_JIG_USB_2 0x19
74 #define MAX8997_ADC_DESKDOCK 0x1a
75 #define MAX8997_ADC_JIG_UART 0x1c
76 #define MAX8997_ADC_CARDOCK 0x1d
77 #define MAX8997_ADC_OPEN 0x1f
79 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 max8997_dev *iodev;
99 struct i2c_client *muic;
100 struct max8997_muic_platform_data *muic_pdata;
103 struct work_struct irq_work;
105 enum max8997_muic_charger_type pre_charger_type;
111 static int max8997_muic_handle_usb(struct max8997_muic_info *info,
112 enum max8997_muic_usb_type usb_type, bool attached)
114 struct max8997_muic_platform_data *mdata = info->muic_pdata;
117 if (usb_type == MAX8997_USB_HOST) {
119 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
120 attached ? MAX8997_SW_USB : MAX8997_SW_OPEN,
123 dev_err(info->dev, "failed to update muic register\n");
128 if (mdata->usb_callback)
129 mdata->usb_callback(usb_type, attached);
134 static void max8997_muic_handle_mhl(struct max8997_muic_info *info,
137 struct max8997_muic_platform_data *mdata = info->muic_pdata;
139 if (mdata->mhl_callback)
140 mdata->mhl_callback(attached);
143 static int max8997_muic_handle_dock(struct max8997_muic_info *info,
144 int adc, bool attached)
146 struct max8997_muic_platform_data *mdata = info->muic_pdata;
149 /* switch to AUDIO */
150 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
151 attached ? MAX8997_SW_AUDIO : MAX8997_SW_OPEN,
154 dev_err(info->dev, "failed to update muic register\n");
159 case MAX8997_ADC_DESKDOCK:
160 if (mdata->deskdock_callback)
161 mdata->deskdock_callback(attached);
163 case MAX8997_ADC_CARDOCK:
164 if (mdata->cardock_callback)
165 mdata->cardock_callback(attached);
174 static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
177 struct max8997_muic_platform_data *mdata = info->muic_pdata;
181 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
182 attached ? MAX8997_SW_UART : MAX8997_SW_OPEN,
185 dev_err(info->dev, "failed to update muic register\n");
189 if (mdata->uart_callback)
190 mdata->uart_callback(attached);
195 static int max8997_muic_handle_adc_detach(struct max8997_muic_info *info)
199 switch (info->pre_adc) {
200 case MAX8997_ADC_GROUND:
201 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, false);
203 case MAX8997_ADC_MHL:
204 max8997_muic_handle_mhl(info, false);
206 case MAX8997_ADC_JIG_USB_1:
207 case MAX8997_ADC_JIG_USB_2:
208 ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, false);
210 case MAX8997_ADC_DESKDOCK:
211 case MAX8997_ADC_CARDOCK:
212 ret = max8997_muic_handle_dock(info, info->pre_adc, false);
214 case MAX8997_ADC_JIG_UART:
215 ret = max8997_muic_handle_jig_uart(info, false);
224 static int max8997_muic_handle_adc(struct max8997_muic_info *info, int adc)
229 case MAX8997_ADC_GROUND:
230 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, true);
232 case MAX8997_ADC_MHL:
233 max8997_muic_handle_mhl(info, true);
235 case MAX8997_ADC_JIG_USB_1:
236 case MAX8997_ADC_JIG_USB_2:
237 ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, true);
239 case MAX8997_ADC_DESKDOCK:
240 case MAX8997_ADC_CARDOCK:
241 ret = max8997_muic_handle_dock(info, adc, true);
243 case MAX8997_ADC_JIG_UART:
244 ret = max8997_muic_handle_jig_uart(info, true);
246 case MAX8997_ADC_OPEN:
247 ret = max8997_muic_handle_adc_detach(info);
258 static int max8997_muic_handle_charger_type(struct max8997_muic_info *info,
259 enum max8997_muic_charger_type charger_type)
261 struct max8997_muic_platform_data *mdata = info->muic_pdata;
265 ret = max8997_read_reg(info->muic, MAX8997_MUIC_REG_STATUS1, &adc);
267 dev_err(info->dev, "failed to read muic register\n");
271 switch (charger_type) {
272 case MAX8997_CHARGER_TYPE_NONE:
273 if (mdata->charger_callback)
274 mdata->charger_callback(false, charger_type);
275 if (info->pre_charger_type == MAX8997_CHARGER_TYPE_USB) {
276 max8997_muic_handle_usb(info,
277 MAX8997_USB_DEVICE, false);
280 case MAX8997_CHARGER_TYPE_USB:
281 if ((adc & STATUS1_ADC_MASK) == MAX8997_ADC_OPEN) {
282 max8997_muic_handle_usb(info,
283 MAX8997_USB_DEVICE, true);
285 if (mdata->charger_callback)
286 mdata->charger_callback(true, charger_type);
288 case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
289 case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
290 case MAX8997_CHARGER_TYPE_500MA:
291 case MAX8997_CHARGER_TYPE_1A:
292 if (mdata->charger_callback)
293 mdata->charger_callback(true, charger_type);
299 info->pre_charger_type = charger_type;
304 static void max8997_muic_irq_work(struct work_struct *work)
306 struct max8997_muic_info *info = container_of(work,
307 struct max8997_muic_info, irq_work);
308 struct max8997_platform_data *pdata =
309 dev_get_platdata(info->iodev->dev);
313 int irq_type = info->irq - pdata->irq_base;
316 mutex_lock(&info->mutex);
318 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
321 dev_err(info->dev, "failed to read muic register\n");
322 mutex_unlock(&info->mutex);
326 dev_dbg(info->dev, "%s: STATUS1:0x%x, 2:0x%x\n", __func__,
327 status[0], status[1]);
330 case MAX8997_MUICIRQ_ADC:
331 adc = status[0] & STATUS1_ADC_MASK;
332 adc >>= STATUS1_ADC_SHIFT;
334 max8997_muic_handle_adc(info, adc);
336 case MAX8997_MUICIRQ_ChgTyp:
337 chg_type = status[1] & STATUS2_CHGTYP_MASK;
338 chg_type >>= STATUS2_CHGTYP_SHIFT;
340 max8997_muic_handle_charger_type(info, chg_type);
343 dev_info(info->dev, "misc interrupt: %s occurred\n",
344 muic_irqs[irq_type].name);
348 mutex_unlock(&info->mutex);
353 static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
355 struct max8997_muic_info *info = data;
357 dev_dbg(info->dev, "irq:%d\n", irq);
360 schedule_work(&info->irq_work);
365 static void max8997_muic_detect_dev(struct max8997_muic_info *info)
368 u8 status[2], adc, chg_type;
370 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
373 dev_err(info->dev, "failed to read muic register\n");
377 dev_info(info->dev, "STATUS1:0x%x, STATUS2:0x%x\n",
378 status[0], status[1]);
380 adc = status[0] & STATUS1_ADC_MASK;
381 adc >>= STATUS1_ADC_SHIFT;
383 chg_type = status[1] & STATUS2_CHGTYP_MASK;
384 chg_type >>= STATUS2_CHGTYP_SHIFT;
386 max8997_muic_handle_adc(info, adc);
387 max8997_muic_handle_charger_type(info, chg_type);
390 static void max8997_initialize_device(struct max8997_muic_info *info)
392 struct max8997_muic_platform_data *mdata = info->muic_pdata;
395 for (i = 0; i < mdata->num_init_data; i++) {
396 max8997_write_reg(info->muic, mdata->init_data[i].addr,
397 mdata->init_data[i].data);
401 static int __devinit max8997_muic_probe(struct platform_device *pdev)
403 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
404 struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
405 struct max8997_muic_info *info;
408 info = kzalloc(sizeof(struct max8997_muic_info), GFP_KERNEL);
410 dev_err(&pdev->dev, "failed to allocate memory\n");
415 if (!pdata->muic_pdata) {
416 dev_err(&pdev->dev, "failed to get platform_data\n");
420 info->muic_pdata = pdata->muic_pdata;
422 info->dev = &pdev->dev;
424 info->muic = iodev->muic;
426 platform_set_drvdata(pdev, info);
427 mutex_init(&info->mutex);
429 INIT_WORK(&info->irq_work, max8997_muic_irq_work);
431 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
432 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
434 ret = request_threaded_irq(pdata->irq_base + muic_irq->irq,
435 NULL, max8997_muic_irq_handler,
440 "failed: irq request (IRQ: %d,"
444 for (i = i - 1; i >= 0; i--)
445 free_irq(muic_irq->irq, info);
451 /* Initialize registers according to platform data */
452 max8997_initialize_device(info);
454 /* Initial device detection */
455 max8997_muic_detect_dev(info);
466 static int __devexit max8997_muic_remove(struct platform_device *pdev)
468 struct max8997_muic_info *info = platform_get_drvdata(pdev);
469 struct max8997_platform_data *pdata =
470 dev_get_platdata(info->iodev->dev);
473 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
474 free_irq(pdata->irq_base + muic_irqs[i].irq, info);
475 cancel_work_sync(&info->irq_work);
482 static struct platform_driver max8997_muic_driver = {
484 .name = "max8997-muic",
485 .owner = THIS_MODULE,
487 .probe = max8997_muic_probe,
488 .remove = __devexit_p(max8997_muic_remove),
491 module_platform_driver(max8997_muic_driver);
493 MODULE_DESCRIPTION("Maxim MAX8997 MUIC driver");
494 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
495 MODULE_LICENSE("GPL");