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99f09beb DK |
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 | ||
79 | struct max8997_muic_irq { | |
80 | unsigned int irq; | |
81 | const char *name; | |
82 | }; | |
83 | ||
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" }, | |
94 | }; | |
95 | ||
96 | struct 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 | ||
111 | static 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); | |
130 | out: | |
131 | return ret; | |
132 | } | |
133 | ||
134 | static 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 | ||
143 | static 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 | } | |
170 | out: | |
171 | return ret; | |
172 | } | |
173 | ||
174 | static 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); | |
191 | out: | |
192 | return ret; | |
193 | } | |
194 | ||
195 | static 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 | ||
224 | static 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 | ||
258 | static 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; | |
300 | out: | |
301 | return ret; | |
302 | } | |
303 | ||
304 | static 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); | |
99f09beb | 310 | u8 status[3]; |
71e58782 | 311 | u8 adc, chg_type; |
99f09beb DK |
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) { | |
99f09beb DK |
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); | |
99f09beb DK |
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); | |
99f09beb DK |
341 | break; |
342 | default: | |
71e58782 DK |
343 | dev_info(info->dev, "misc interrupt: %s occurred\n", |
344 | muic_irqs[irq_type].name); | |
99f09beb DK |
345 | break; |
346 | } | |
347 | ||
99f09beb DK |
348 | mutex_unlock(&info->mutex); |
349 | ||
350 | return; | |
351 | } | |
352 | ||
353 | static 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 | ||
365 | static 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 | ||
99f09beb DK |
390 | static 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 | ||
401 | static 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 | ||
99f09beb DK |
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 | ||
459 | err_irq: | |
99f09beb DK |
460 | err_pdata: |
461 | kfree(info); | |
462 | err_kfree: | |
463 | return ret; | |
464 | } | |
465 | ||
466 | static 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 | ||
99f09beb DK |
473 | for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) |
474 | free_irq(pdata->irq_base + muic_irqs[i].irq, info); | |
71e58782 | 475 | cancel_work_sync(&info->irq_work); |
99f09beb DK |
476 | |
477 | kfree(info); | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
482 | static 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 | ||
491 | static int __init max8997_muic_init(void) | |
492 | { | |
493 | return platform_driver_register(&max8997_muic_driver); | |
494 | } | |
495 | module_init(max8997_muic_init); | |
496 | ||
497 | static void __exit max8997_muic_exit(void) | |
498 | { | |
499 | platform_driver_unregister(&max8997_muic_driver); | |
500 | } | |
501 | module_exit(max8997_muic_exit); | |
502 | ||
503 | MODULE_DESCRIPTION("Maxim MAX8997 MUIC driver"); | |
504 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
505 | MODULE_LICENSE("GPL"); |