tjh.dev
Linux kernel mirror (for testing)
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kernel
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linux
1/*
2 * max8997-muic.c - MAX8997 muic driver for the Maxim 8997
3 *
4 * Copyright (C) 2011 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 * 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
20 *
21 */
22
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>
33
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)
41
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)
53
54/* MAX8997-MUIC STATUS3 register */
55#define STATUS3_OVP_SHIFT 2
56#define STATUS3_OVP_MASK (0x1 << STATUS3_OVP_SHIFT)
57
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)
64
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))
69
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
78
79struct max8997_muic_irq {
80 unsigned int irq;
81 const char *name;
82};
83
84static 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" },
94};
95
96struct max8997_muic_info {
97 struct device *dev;
98 struct max8997_dev *iodev;
99 struct i2c_client *muic;
100 struct max8997_muic_platform_data *muic_pdata;
101
102 int irq;
103 struct work_struct irq_work;
104
105 enum max8997_muic_charger_type pre_charger_type;
106 int pre_adc;
107
108 struct mutex mutex;
109};
110
111static int max8997_muic_handle_usb(struct max8997_muic_info *info,
112 enum max8997_muic_usb_type usb_type, bool attached)
113{
114 struct max8997_muic_platform_data *mdata = info->muic_pdata;
115 int ret = 0;
116
117 if (usb_type == MAX8997_USB_HOST) {
118 /* switch to USB */
119 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
120 attached ? MAX8997_SW_USB : MAX8997_SW_OPEN,
121 SW_MASK);
122 if (ret) {
123 dev_err(info->dev, "failed to update muic register\n");
124 goto out;
125 }
126 }
127
128 if (mdata->usb_callback)
129 mdata->usb_callback(usb_type, attached);
130out:
131 return ret;
132}
133
134static void max8997_muic_handle_mhl(struct max8997_muic_info *info,
135 bool attached)
136{
137 struct max8997_muic_platform_data *mdata = info->muic_pdata;
138
139 if (mdata->mhl_callback)
140 mdata->mhl_callback(attached);
141}
142
143static int max8997_muic_handle_dock(struct max8997_muic_info *info,
144 int adc, bool attached)
145{
146 struct max8997_muic_platform_data *mdata = info->muic_pdata;
147 int ret = 0;
148
149 /* switch to AUDIO */
150 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
151 attached ? MAX8997_SW_AUDIO : MAX8997_SW_OPEN,
152 SW_MASK);
153 if (ret) {
154 dev_err(info->dev, "failed to update muic register\n");
155 goto out;
156 }
157
158 switch (adc) {
159 case MAX8997_ADC_DESKDOCK:
160 if (mdata->deskdock_callback)
161 mdata->deskdock_callback(attached);
162 break;
163 case MAX8997_ADC_CARDOCK:
164 if (mdata->cardock_callback)
165 mdata->cardock_callback(attached);
166 break;
167 default:
168 break;
169 }
170out:
171 return ret;
172}
173
174static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
175 bool attached)
176{
177 struct max8997_muic_platform_data *mdata = info->muic_pdata;
178 int ret = 0;
179
180 /* switch to UART */
181 ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1,
182 attached ? MAX8997_SW_UART : MAX8997_SW_OPEN,
183 SW_MASK);
184 if (ret) {
185 dev_err(info->dev, "failed to update muic register\n");
186 goto out;
187 }
188
189 if (mdata->uart_callback)
190 mdata->uart_callback(attached);
191out:
192 return ret;
193}
194
195static int max8997_muic_handle_adc_detach(struct max8997_muic_info *info)
196{
197 int ret = 0;
198
199 switch (info->pre_adc) {
200 case MAX8997_ADC_GROUND:
201 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, false);
202 break;
203 case MAX8997_ADC_MHL:
204 max8997_muic_handle_mhl(info, false);
205 break;
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);
209 break;
210 case MAX8997_ADC_DESKDOCK:
211 case MAX8997_ADC_CARDOCK:
212 ret = max8997_muic_handle_dock(info, info->pre_adc, false);
213 break;
214 case MAX8997_ADC_JIG_UART:
215 ret = max8997_muic_handle_jig_uart(info, false);
216 break;
217 default:
218 break;
219 }
220
221 return ret;
222}
223
224static int max8997_muic_handle_adc(struct max8997_muic_info *info, int adc)
225{
226 int ret = 0;
227
228 switch (adc) {
229 case MAX8997_ADC_GROUND:
230 ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, true);
231 break;
232 case MAX8997_ADC_MHL:
233 max8997_muic_handle_mhl(info, true);
234 break;
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);
238 break;
239 case MAX8997_ADC_DESKDOCK:
240 case MAX8997_ADC_CARDOCK:
241 ret = max8997_muic_handle_dock(info, adc, true);
242 break;
243 case MAX8997_ADC_JIG_UART:
244 ret = max8997_muic_handle_jig_uart(info, true);
245 break;
246 case MAX8997_ADC_OPEN:
247 ret = max8997_muic_handle_adc_detach(info);
248 break;
249 default:
250 break;
251 }
252
253 info->pre_adc = adc;
254
255 return ret;
256}
257
258static int max8997_muic_handle_charger_type(struct max8997_muic_info *info,
259 enum max8997_muic_charger_type charger_type)
260{
261 struct max8997_muic_platform_data *mdata = info->muic_pdata;
262 u8 adc;
263 int ret;
264
265 ret = max8997_read_reg(info->muic, MAX8997_MUIC_REG_STATUS1, &adc);
266 if (ret) {
267 dev_err(info->dev, "failed to read muic register\n");
268 goto out;
269 }
270
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);
278 }
279 break;
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);
284 }
285 if (mdata->charger_callback)
286 mdata->charger_callback(true, charger_type);
287 break;
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);
294 break;
295 default:
296 break;
297 }
298
299 info->pre_charger_type = charger_type;
300out:
301 return ret;
302}
303
304static void max8997_muic_irq_work(struct work_struct *work)
305{
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);
310 u8 status[3];
311 u8 adc, chg_type;
312
313 int irq_type = info->irq - pdata->irq_base;
314 int ret;
315
316 mutex_lock(&info->mutex);
317
318 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
319 3, status);
320 if (ret) {
321 dev_err(info->dev, "failed to read muic register\n");
322 mutex_unlock(&info->mutex);
323 return;
324 }
325
326 dev_dbg(info->dev, "%s: STATUS1:0x%x, 2:0x%x\n", __func__,
327 status[0], status[1]);
328
329 switch (irq_type) {
330 case MAX8997_MUICIRQ_ADC:
331 adc = status[0] & STATUS1_ADC_MASK;
332 adc >>= STATUS1_ADC_SHIFT;
333
334 max8997_muic_handle_adc(info, adc);
335 break;
336 case MAX8997_MUICIRQ_ChgTyp:
337 chg_type = status[1] & STATUS2_CHGTYP_MASK;
338 chg_type >>= STATUS2_CHGTYP_SHIFT;
339
340 max8997_muic_handle_charger_type(info, chg_type);
341 break;
342 default:
343 dev_info(info->dev, "misc interrupt: %s occurred\n",
344 muic_irqs[irq_type].name);
345 break;
346 }
347
348 mutex_unlock(&info->mutex);
349
350 return;
351}
352
353static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
354{
355 struct max8997_muic_info *info = data;
356
357 dev_dbg(info->dev, "irq:%d\n", irq);
358 info->irq = irq;
359
360 schedule_work(&info->irq_work);
361
362 return IRQ_HANDLED;
363}
364
365static void max8997_muic_detect_dev(struct max8997_muic_info *info)
366{
367 int ret;
368 u8 status[2], adc, chg_type;
369
370 ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
371 2, status);
372 if (ret) {
373 dev_err(info->dev, "failed to read muic register\n");
374 return;
375 }
376
377 dev_info(info->dev, "STATUS1:0x%x, STATUS2:0x%x\n",
378 status[0], status[1]);
379
380 adc = status[0] & STATUS1_ADC_MASK;
381 adc >>= STATUS1_ADC_SHIFT;
382
383 chg_type = status[1] & STATUS2_CHGTYP_MASK;
384 chg_type >>= STATUS2_CHGTYP_SHIFT;
385
386 max8997_muic_handle_adc(info, adc);
387 max8997_muic_handle_charger_type(info, chg_type);
388}
389
390static void max8997_initialize_device(struct max8997_muic_info *info)
391{
392 struct max8997_muic_platform_data *mdata = info->muic_pdata;
393 int i;
394
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);
398 }
399}
400
401static int __devinit max8997_muic_probe(struct platform_device *pdev)
402{
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;
406 int ret, i;
407
408 info = kzalloc(sizeof(struct max8997_muic_info), GFP_KERNEL);
409 if (!info) {
410 dev_err(&pdev->dev, "failed to allocate memory\n");
411 ret = -ENOMEM;
412 goto err_kfree;
413 }
414
415 if (!pdata->muic_pdata) {
416 dev_err(&pdev->dev, "failed to get platform_data\n");
417 ret = -EINVAL;
418 goto err_pdata;
419 }
420 info->muic_pdata = pdata->muic_pdata;
421
422 info->dev = &pdev->dev;
423 info->iodev = iodev;
424 info->muic = iodev->muic;
425
426 platform_set_drvdata(pdev, info);
427 mutex_init(&info->mutex);
428
429 INIT_WORK(&info->irq_work, max8997_muic_irq_work);
430
431 for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
432 struct max8997_muic_irq *muic_irq = &muic_irqs[i];
433
434 ret = request_threaded_irq(pdata->irq_base + muic_irq->irq,
435 NULL, max8997_muic_irq_handler,
436 0, muic_irq->name,
437 info);
438 if (ret) {
439 dev_err(&pdev->dev,
440 "failed: irq request (IRQ: %d,"
441 " error :%d)\n",
442 muic_irq->irq, ret);
443
444 for (i = i - 1; i >= 0; i--)
445 free_irq(muic_irq->irq, info);
446
447 goto err_irq;
448 }
449 }
450
451 /* Initialize registers according to platform data */
452 max8997_initialize_device(info);
453
454 /* Initial device detection */
455 max8997_muic_detect_dev(info);
456
457 return ret;
458
459err_irq:
460err_pdata:
461 kfree(info);
462err_kfree:
463 return ret;
464}
465
466static int __devexit max8997_muic_remove(struct platform_device *pdev)
467{
468 struct max8997_muic_info *info = platform_get_drvdata(pdev);
469 struct max8997_platform_data *pdata =
470 dev_get_platdata(info->iodev->dev);
471 int i;
472
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);
476
477 kfree(info);
478
479 return 0;
480}
481
482static struct platform_driver max8997_muic_driver = {
483 .driver = {
484 .name = "max8997-muic",
485 .owner = THIS_MODULE,
486 },
487 .probe = max8997_muic_probe,
488 .remove = __devexit_p(max8997_muic_remove),
489};
490
491static int __init max8997_muic_init(void)
492{
493 return platform_driver_register(&max8997_muic_driver);
494}
495module_init(max8997_muic_init);
496
497static void __exit max8997_muic_exit(void)
498{
499 platform_driver_unregister(&max8997_muic_driver);
500}
501module_exit(max8997_muic_exit);
502
503MODULE_DESCRIPTION("Maxim MAX8997 MUIC driver");
504MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
505MODULE_LICENSE("GPL");