]>
Commit | Line | Data |
---|---|---|
b76668ba CC |
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 | ||
77 | struct max8997_muic_irq { | |
78 | unsigned int irq; | |
79 | const char *name; | |
80 | }; | |
81 | ||
82 | static 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 | ||
94 | struct 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 | ||
110 | const 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 | [7] = "Dock-card", | |
120 | [8] = "JIG", | |
121 | ||
122 | NULL, | |
123 | }; | |
124 | ||
125 | static 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 | ||
153 | out: | |
154 | return ret; | |
155 | } | |
156 | ||
157 | static 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 | } | |
182 | out: | |
183 | return ret; | |
184 | } | |
185 | ||
186 | static 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); | |
201 | out: | |
202 | return ret; | |
203 | } | |
204 | ||
205 | static 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 | ||
234 | static 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; | |
265 | out: | |
266 | return ret; | |
267 | } | |
268 | ||
269 | static 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 | ||
298 | static 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; | |
338 | out: | |
339 | return ret; | |
340 | } | |
341 | ||
342 | static 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 | ||
390 | static 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 | ||
402 | static 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 | ||
427 | static 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 | ||
462 | for (i = i - 1; i >= 0; i--) | |
463 | free_irq(muic_irq->irq, info); | |
464 | ||
465 | goto err_irq; | |
466 | } | |
467 | } | |
468 | ||
469 | /* External connector */ | |
470 | info->edev = kzalloc(sizeof(struct extcon_dev), GFP_KERNEL); | |
471 | if (!info->edev) { | |
472 | dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); | |
473 | ret = -ENOMEM; | |
474 | goto err_irq; | |
475 | } | |
476 | info->edev->name = DEV_NAME; | |
477 | info->edev->supported_cable = max8997_extcon_cable; | |
478 | ret = extcon_dev_register(info->edev, NULL); | |
479 | if (ret) { | |
480 | dev_err(&pdev->dev, "failed to register extcon device\n"); | |
481 | goto err_extcon; | |
482 | } | |
483 | ||
484 | /* Initialize registers according to platform data */ | |
485 | if (pdata->muic_pdata) { | |
486 | struct max8997_muic_platform_data *mdata = info->muic_pdata; | |
487 | ||
488 | for (i = 0; i < mdata->num_init_data; i++) { | |
489 | max8997_write_reg(info->muic, mdata->init_data[i].addr, | |
490 | mdata->init_data[i].data); | |
491 | } | |
492 | } | |
493 | ||
494 | /* Initial device detection */ | |
495 | max8997_muic_detect_dev(info); | |
496 | ||
497 | return ret; | |
498 | ||
499 | err_extcon: | |
500 | kfree(info->edev); | |
501 | err_irq: | |
502 | kfree(info); | |
503 | err_kfree: | |
504 | return ret; | |
505 | } | |
506 | ||
507 | static int __devexit max8997_muic_remove(struct platform_device *pdev) | |
508 | { | |
509 | struct max8997_muic_info *info = platform_get_drvdata(pdev); | |
510 | struct max8997_dev *max8997 = i2c_get_clientdata(info->muic); | |
511 | int i; | |
512 | ||
513 | for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) | |
514 | free_irq(max8997->irq_base + muic_irqs[i].irq, info); | |
515 | cancel_work_sync(&info->irq_work); | |
516 | ||
517 | extcon_dev_unregister(info->edev); | |
518 | ||
519 | kfree(info); | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
524 | static struct platform_driver max8997_muic_driver = { | |
525 | .driver = { | |
526 | .name = DEV_NAME, | |
527 | .owner = THIS_MODULE, | |
528 | }, | |
529 | .probe = max8997_muic_probe, | |
530 | .remove = __devexit_p(max8997_muic_remove), | |
531 | }; | |
532 | ||
533 | module_platform_driver(max8997_muic_driver); | |
534 | ||
535 | MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver"); | |
536 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
537 | MODULE_LICENSE("GPL"); |