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1 | /* |
2 | * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC |
3 | * |
4 | * Copyright (C) 2012 Samsung Electronics |
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 | #include <linux/irqdomain.h> |
30 | |
31 | #define DEV_NAME "max8997-muic" |
32 | #define DELAY_MS_DEFAULT 20000 /* unit: millisecond */ |
33 | |
34 | enum max8997_muic_adc_debounce_time { |
35 | ADC_DEBOUNCE_TIME_0_5MS = 0, /* 0.5ms */ |
36 | ADC_DEBOUNCE_TIME_10MS, /* 10ms */ |
37 | ADC_DEBOUNCE_TIME_25MS, /* 25ms */ |
38 | ADC_DEBOUNCE_TIME_38_62MS, /* 38.62ms */ |
39 | }; |
40 | |
41 | struct max8997_muic_irq { |
42 | unsigned int irq; |
43 | const char *name; |
44 | unsigned int virq; |
45 | }; |
46 | |
47 | static struct max8997_muic_irq muic_irqs[] = { |
48 | { MAX8997_MUICIRQ_ADCError, "muic-ADCERROR" }, |
49 | { MAX8997_MUICIRQ_ADCLow, "muic-ADCLOW" }, |
50 | { MAX8997_MUICIRQ_ADC, "muic-ADC" }, |
51 | { MAX8997_MUICIRQ_VBVolt, "muic-VBVOLT" }, |
52 | { MAX8997_MUICIRQ_DBChg, "muic-DBCHG" }, |
53 | { MAX8997_MUICIRQ_DCDTmr, "muic-DCDTMR" }, |
54 | { MAX8997_MUICIRQ_ChgDetRun, "muic-CHGDETRUN" }, |
55 | { MAX8997_MUICIRQ_ChgTyp, "muic-CHGTYP" }, |
56 | { MAX8997_MUICIRQ_OVP, "muic-OVP" }, |
57 | }; |
58 | |
59 | /* Define supported cable type */ |
60 | enum max8997_muic_acc_type { |
61 | MAX8997_MUIC_ADC_GROUND = 0x0, |
62 | MAX8997_MUIC_ADC_MHL, /* MHL*/ |
63 | MAX8997_MUIC_ADC_REMOTE_S1_BUTTON, |
64 | MAX8997_MUIC_ADC_REMOTE_S2_BUTTON, |
65 | MAX8997_MUIC_ADC_REMOTE_S3_BUTTON, |
66 | MAX8997_MUIC_ADC_REMOTE_S4_BUTTON, |
67 | MAX8997_MUIC_ADC_REMOTE_S5_BUTTON, |
68 | MAX8997_MUIC_ADC_REMOTE_S6_BUTTON, |
69 | MAX8997_MUIC_ADC_REMOTE_S7_BUTTON, |
70 | MAX8997_MUIC_ADC_REMOTE_S8_BUTTON, |
71 | MAX8997_MUIC_ADC_REMOTE_S9_BUTTON, |
72 | MAX8997_MUIC_ADC_REMOTE_S10_BUTTON, |
73 | MAX8997_MUIC_ADC_REMOTE_S11_BUTTON, |
74 | MAX8997_MUIC_ADC_REMOTE_S12_BUTTON, |
75 | MAX8997_MUIC_ADC_RESERVED_ACC_1, |
76 | MAX8997_MUIC_ADC_RESERVED_ACC_2, |
77 | MAX8997_MUIC_ADC_RESERVED_ACC_3, |
78 | MAX8997_MUIC_ADC_RESERVED_ACC_4, |
79 | MAX8997_MUIC_ADC_RESERVED_ACC_5, |
80 | MAX8997_MUIC_ADC_CEA936_AUDIO, |
81 | MAX8997_MUIC_ADC_PHONE_POWERED_DEV, |
82 | MAX8997_MUIC_ADC_TTY_CONVERTER, |
83 | MAX8997_MUIC_ADC_UART_CABLE, |
84 | MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG, |
85 | MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF, /* JIG-USB-OFF */ |
86 | MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON, /* JIG-USB-ON */ |
87 | MAX8997_MUIC_ADC_AV_CABLE_NOLOAD, /* DESKDOCK */ |
88 | MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG, |
89 | MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF, /* JIG-UART */ |
90 | MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON, /* CARDOCK */ |
91 | MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE, |
92 | MAX8997_MUIC_ADC_OPEN, /* OPEN */ |
93 | }; |
94 | |
95 | enum max8997_muic_cable_group { |
96 | MAX8997_CABLE_GROUP_ADC = 0, |
97 | MAX8997_CABLE_GROUP_ADC_GND, |
98 | MAX8997_CABLE_GROUP_CHG, |
99 | MAX8997_CABLE_GROUP_VBVOLT, |
100 | }; |
101 | |
102 | enum max8997_muic_usb_type { |
103 | MAX8997_USB_HOST, |
104 | MAX8997_USB_DEVICE, |
105 | }; |
106 | |
107 | enum max8997_muic_charger_type { |
108 | MAX8997_CHARGER_TYPE_NONE = 0, |
109 | MAX8997_CHARGER_TYPE_USB, |
110 | MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT, |
111 | MAX8997_CHARGER_TYPE_DEDICATED_CHG, |
112 | MAX8997_CHARGER_TYPE_500MA, |
113 | MAX8997_CHARGER_TYPE_1A, |
114 | MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7, |
115 | }; |
116 | |
117 | struct max8997_muic_info { |
118 | struct device *dev; |
119 | struct i2c_client *muic; |
120 | struct extcon_dev *edev; |
121 | int prev_cable_type; |
122 | int prev_chg_type; |
123 | u8 status[2]; |
124 | |
125 | int irq; |
126 | struct work_struct irq_work; |
127 | struct mutex mutex; |
128 | |
129 | struct max8997_muic_platform_data *muic_pdata; |
130 | enum max8997_muic_charger_type pre_charger_type; |
131 | |
132 | /* |
133 | * Use delayed workqueue to detect cable state and then |
134 | * notify cable state to notifiee/platform through uevent. |
135 | * After completing the booting of platform, the extcon provider |
136 | * driver should notify cable state to upper layer. |
137 | */ |
138 | struct delayed_work wq_detcable; |
139 | |
140 | /* |
141 | * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB |
142 | * h/w path of COMP2/COMN1 on CONTROL1 register. |
143 | */ |
144 | int path_usb; |
145 | int path_uart; |
146 | }; |
147 | |
148 | enum { |
149 | EXTCON_CABLE_USB = 0, |
150 | EXTCON_CABLE_USB_HOST, |
151 | EXTCON_CABLE_TA, |
152 | EXTCON_CABLE_FAST_CHARGER, |
153 | EXTCON_CABLE_SLOW_CHARGER, |
154 | EXTCON_CABLE_CHARGE_DOWNSTREAM, |
155 | EXTCON_CABLE_MHL, |
156 | EXTCON_CABLE_DOCK_DESK, |
157 | EXTCON_CABLE_DOCK_CARD, |
158 | EXTCON_CABLE_JIG, |
159 | |
160 | _EXTCON_CABLE_NUM, |
161 | }; |
162 | |
163 | static const char *max8997_extcon_cable[] = { |
164 | [EXTCON_CABLE_USB] = "USB", |
165 | [EXTCON_CABLE_USB_HOST] = "USB-Host", |
166 | [EXTCON_CABLE_TA] = "TA", |
167 | [EXTCON_CABLE_FAST_CHARGER] = "Fast-charger", |
168 | [EXTCON_CABLE_SLOW_CHARGER] = "Slow-charger", |
169 | [EXTCON_CABLE_CHARGE_DOWNSTREAM] = "Charge-downstream", |
170 | [EXTCON_CABLE_MHL] = "MHL", |
171 | [EXTCON_CABLE_DOCK_DESK] = "Dock-Desk", |
172 | [EXTCON_CABLE_DOCK_CARD] = "Dock-Card", |
173 | [EXTCON_CABLE_JIG] = "JIG", |
174 | |
175 | NULL, |
176 | }; |
177 | |
178 | /* |
179 | * max8997_muic_set_debounce_time - Set the debounce time of ADC |
180 | * @info: the instance including private data of max8997 MUIC |
181 | * @time: the debounce time of ADC |
182 | */ |
183 | static int max8997_muic_set_debounce_time(struct max8997_muic_info *info, |
184 | enum max8997_muic_adc_debounce_time time) |
185 | { |
186 | int ret; |
187 | |
188 | switch (time) { |
189 | case ADC_DEBOUNCE_TIME_0_5MS: |
190 | case ADC_DEBOUNCE_TIME_10MS: |
191 | case ADC_DEBOUNCE_TIME_25MS: |
192 | case ADC_DEBOUNCE_TIME_38_62MS: |
193 | ret = max8997_update_reg(info->muic, |
194 | MAX8997_MUIC_REG_CONTROL3, |
195 | time << CONTROL3_ADCDBSET_SHIFT, |
196 | CONTROL3_ADCDBSET_MASK); |
197 | if (ret) { |
198 | dev_err(info->dev, "failed to set ADC debounce time\n"); |
199 | return -EAGAIN; |
200 | } |
201 | break; |
202 | default: |
203 | dev_err(info->dev, "invalid ADC debounce time\n"); |
204 | return -EINVAL; |
205 | } |
206 | |
207 | return 0; |
208 | }; |
209 | |
210 | /* |
211 | * max8997_muic_set_path - Set hardware line according to attached cable |
212 | * @info: the instance including private data of max8997 MUIC |
213 | * @value: the path according to attached cable |
214 | * @attached: the state of cable (true:attached, false:detached) |
215 | * |
216 | * The max8997 MUIC device share outside H/W line among a varity of cables, |
217 | * so this function set internal path of H/W line according to the type of |
218 | * attached cable. |
219 | */ |
220 | static int max8997_muic_set_path(struct max8997_muic_info *info, |
221 | u8 val, bool attached) |
222 | { |
223 | int ret = 0; |
224 | u8 ctrl1, ctrl2 = 0; |
225 | |
226 | if (attached) |
227 | ctrl1 = val; |
228 | else |
229 | ctrl1 = CONTROL1_SW_OPEN; |
230 | |
231 | ret = max8997_update_reg(info->muic, |
232 | MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK); |
233 | if (ret < 0) { |
234 | dev_err(info->dev, "failed to update MUIC register\n"); |
235 | return -EAGAIN; |
236 | } |
237 | |
238 | if (attached) |
239 | ctrl2 |= CONTROL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */ |
240 | else |
241 | ctrl2 |= CONTROL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */ |
242 | |
243 | ret = max8997_update_reg(info->muic, |
244 | MAX8997_MUIC_REG_CONTROL2, ctrl2, |
245 | CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK); |
246 | if (ret < 0) { |
247 | dev_err(info->dev, "failed to update MUIC register\n"); |
248 | return -EAGAIN; |
249 | } |
250 | |
251 | dev_info(info->dev, |
252 | "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n", |
253 | ctrl1, ctrl2, attached ? "attached" : "detached"); |
254 | |
255 | return 0; |
256 | } |
257 | |
258 | /* |
259 | * max8997_muic_get_cable_type - Return cable type and check cable state |
260 | * @info: the instance including private data of max8997 MUIC |
261 | * @group: the path according to attached cable |
262 | * @attached: store cable state and return |
263 | * |
264 | * This function check the cable state either attached or detached, |
265 | * and then divide precise type of cable according to cable group. |
266 | * - MAX8997_CABLE_GROUP_ADC |
267 | * - MAX8997_CABLE_GROUP_CHG |
268 | */ |
269 | static int max8997_muic_get_cable_type(struct max8997_muic_info *info, |
270 | enum max8997_muic_cable_group group, bool *attached) |
271 | { |
272 | int cable_type = 0; |
273 | int adc; |
274 | int chg_type; |
275 | |
276 | switch (group) { |
277 | case MAX8997_CABLE_GROUP_ADC: |
278 | /* |
279 | * Read ADC value to check cable type and decide cable state |
280 | * according to cable type |
281 | */ |
282 | adc = info->status[0] & STATUS1_ADC_MASK; |
283 | adc >>= STATUS1_ADC_SHIFT; |
284 | |
285 | /* |
286 | * Check current cable state/cable type and store cable type |
287 | * (info->prev_cable_type) for handling cable when cable is |
288 | * detached. |
289 | */ |
290 | if (adc == MAX8997_MUIC_ADC_OPEN) { |
291 | *attached = false; |
292 | |
293 | cable_type = info->prev_cable_type; |
294 | info->prev_cable_type = MAX8997_MUIC_ADC_OPEN; |
295 | } else { |
296 | *attached = true; |
297 | |
298 | cable_type = info->prev_cable_type = adc; |
299 | } |
300 | break; |
301 | case MAX8997_CABLE_GROUP_CHG: |
302 | /* |
303 | * Read charger type to check cable type and decide cable state |
304 | * according to type of charger cable. |
305 | */ |
306 | chg_type = info->status[1] & STATUS2_CHGTYP_MASK; |
307 | chg_type >>= STATUS2_CHGTYP_SHIFT; |
308 | |
309 | if (chg_type == MAX8997_CHARGER_TYPE_NONE) { |
310 | *attached = false; |
311 | |
312 | cable_type = info->prev_chg_type; |
313 | info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE; |
314 | } else { |
315 | *attached = true; |
316 | |
317 | /* |
318 | * Check current cable state/cable type and store cable |
319 | * type(info->prev_chg_type) for handling cable when |
320 | * charger cable is detached. |
321 | */ |
322 | cable_type = info->prev_chg_type = chg_type; |
323 | } |
324 | |
325 | break; |
326 | default: |
327 | dev_err(info->dev, "Unknown cable group (%d)\n", group); |
328 | cable_type = -EINVAL; |
329 | break; |
330 | } |
331 | |
332 | return cable_type; |
333 | } |
334 | |
335 | static int max8997_muic_handle_usb(struct max8997_muic_info *info, |
336 | enum max8997_muic_usb_type usb_type, bool attached) |
337 | { |
338 | int ret = 0; |
339 | |
340 | if (usb_type == MAX8997_USB_HOST) { |
341 | ret = max8997_muic_set_path(info, info->path_usb, attached); |
342 | if (ret < 0) { |
343 | dev_err(info->dev, "failed to update muic register\n"); |
344 | return ret; |
345 | } |
346 | } |
347 | |
348 | switch (usb_type) { |
349 | case MAX8997_USB_HOST: |
350 | extcon_set_cable_state(info->edev, "USB-Host", attached); |
351 | break; |
352 | case MAX8997_USB_DEVICE: |
353 | extcon_set_cable_state(info->edev, "USB", attached); |
354 | break; |
355 | default: |
356 | dev_err(info->dev, "failed to detect %s usb cable\n", |
357 | attached ? "attached" : "detached"); |
358 | return -EINVAL; |
359 | } |
360 | |
361 | return 0; |
362 | } |
363 | |
364 | static int max8997_muic_handle_dock(struct max8997_muic_info *info, |
365 | int cable_type, bool attached) |
366 | { |
367 | int ret = 0; |
368 | |
369 | ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached); |
370 | if (ret) { |
371 | dev_err(info->dev, "failed to update muic register\n"); |
372 | return ret; |
373 | } |
374 | |
375 | switch (cable_type) { |
376 | case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD: |
377 | extcon_set_cable_state(info->edev, "Dock-desk", attached); |
378 | break; |
379 | case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON: |
380 | extcon_set_cable_state(info->edev, "Dock-card", attached); |
381 | break; |
382 | default: |
383 | dev_err(info->dev, "failed to detect %s dock device\n", |
384 | attached ? "attached" : "detached"); |
385 | return -EINVAL; |
386 | } |
387 | |
388 | return 0; |
389 | } |
390 | |
391 | static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info, |
392 | bool attached) |
393 | { |
394 | int ret = 0; |
395 | |
396 | /* switch to UART */ |
397 | ret = max8997_muic_set_path(info, info->path_uart, attached); |
398 | if (ret) { |
399 | dev_err(info->dev, "failed to update muic register\n"); |
400 | return -EINVAL; |
401 | } |
402 | |
403 | extcon_set_cable_state(info->edev, "JIG", attached); |
404 | |
405 | return 0; |
406 | } |
407 | |
408 | static int max8997_muic_adc_handler(struct max8997_muic_info *info) |
409 | { |
410 | int cable_type; |
411 | bool attached; |
412 | int ret = 0; |
413 | |
414 | /* Check cable state which is either detached or attached */ |
415 | cable_type = max8997_muic_get_cable_type(info, |
416 | MAX8997_CABLE_GROUP_ADC, &attached); |
417 | |
418 | switch (cable_type) { |
419 | case MAX8997_MUIC_ADC_GROUND: |
420 | ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached); |
421 | if (ret < 0) |
422 | return ret; |
423 | break; |
424 | case MAX8997_MUIC_ADC_MHL: |
425 | extcon_set_cable_state(info->edev, "MHL", attached); |
426 | break; |
427 | case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF: |
428 | case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON: |
429 | ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, attached); |
430 | if (ret < 0) |
431 | return ret; |
432 | break; |
433 | case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD: |
434 | case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON: |
435 | ret = max8997_muic_handle_dock(info, cable_type, attached); |
436 | if (ret < 0) |
437 | return ret; |
438 | break; |
439 | case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF: |
440 | ret = max8997_muic_handle_jig_uart(info, attached); |
441 | break; |
442 | case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON: |
443 | case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON: |
444 | case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON: |
445 | case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON: |
446 | case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON: |
447 | case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON: |
448 | case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON: |
449 | case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON: |
450 | case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON: |
451 | case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON: |
452 | case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON: |
453 | case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON: |
454 | case MAX8997_MUIC_ADC_RESERVED_ACC_1: |
455 | case MAX8997_MUIC_ADC_RESERVED_ACC_2: |
456 | case MAX8997_MUIC_ADC_RESERVED_ACC_3: |
457 | case MAX8997_MUIC_ADC_RESERVED_ACC_4: |
458 | case MAX8997_MUIC_ADC_RESERVED_ACC_5: |
459 | case MAX8997_MUIC_ADC_CEA936_AUDIO: |
460 | case MAX8997_MUIC_ADC_PHONE_POWERED_DEV: |
461 | case MAX8997_MUIC_ADC_TTY_CONVERTER: |
462 | case MAX8997_MUIC_ADC_UART_CABLE: |
463 | case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG: |
464 | case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG: |
465 | case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE: |
466 | /* |
467 | * This cable isn't used in general case if it is specially |
468 | * needed to detect additional cable, should implement |
469 | * proper operation when this cable is attached/detached. |
470 | */ |
471 | dev_info(info->dev, |
472 | "cable is %s but it isn't used (type:0x%x)\n", |
473 | attached ? "attached" : "detached", cable_type); |
474 | return -EAGAIN; |
475 | default: |
476 | dev_err(info->dev, |
477 | "failed to detect %s unknown cable (type:0x%x)\n", |
478 | attached ? "attached" : "detached", cable_type); |
479 | return -EINVAL; |
480 | } |
481 | |
482 | return 0; |
483 | } |
484 | |
485 | static int max8997_muic_chg_handler(struct max8997_muic_info *info) |
486 | { |
487 | int chg_type; |
488 | bool attached; |
489 | int adc; |
490 | |
491 | chg_type = max8997_muic_get_cable_type(info, |
492 | MAX8997_CABLE_GROUP_CHG, &attached); |
493 | |
494 | switch (chg_type) { |
495 | case MAX8997_CHARGER_TYPE_NONE: |
496 | break; |
497 | case MAX8997_CHARGER_TYPE_USB: |
498 | adc = info->status[0] & STATUS1_ADC_MASK; |
499 | adc >>= STATUS1_ADC_SHIFT; |
500 | |
501 | if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) { |
502 | max8997_muic_handle_usb(info, |
503 | MAX8997_USB_DEVICE, attached); |
504 | } |
505 | break; |
506 | case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT: |
507 | extcon_set_cable_state(info->edev, "Charge-downstream", attached); |
508 | break; |
509 | case MAX8997_CHARGER_TYPE_DEDICATED_CHG: |
510 | extcon_set_cable_state(info->edev, "TA", attached); |
511 | break; |
512 | case MAX8997_CHARGER_TYPE_500MA: |
513 | extcon_set_cable_state(info->edev, "Slow-charger", attached); |
514 | break; |
515 | case MAX8997_CHARGER_TYPE_1A: |
516 | extcon_set_cable_state(info->edev, "Fast-charger", attached); |
517 | break; |
518 | default: |
519 | dev_err(info->dev, |
520 | "failed to detect %s unknown chg cable (type:0x%x)\n", |
521 | attached ? "attached" : "detached", chg_type); |
522 | return -EINVAL; |
523 | } |
524 | |
525 | return 0; |
526 | } |
527 | |
528 | static void max8997_muic_irq_work(struct work_struct *work) |
529 | { |
530 | struct max8997_muic_info *info = container_of(work, |
531 | struct max8997_muic_info, irq_work); |
532 | int irq_type = 0; |
533 | int i, ret; |
534 | |
535 | if (!info->edev) |
536 | return; |
537 | |
538 | mutex_lock(&info->mutex); |
539 | |
540 | for (i = 0 ; i < ARRAY_SIZE(muic_irqs) ; i++) |
541 | if (info->irq == muic_irqs[i].virq) |
542 | irq_type = muic_irqs[i].irq; |
543 | |
544 | ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1, |
545 | 2, info->status); |
546 | if (ret) { |
547 | dev_err(info->dev, "failed to read muic register\n"); |
548 | mutex_unlock(&info->mutex); |
549 | return; |
550 | } |
551 | |
552 | switch (irq_type) { |
553 | case MAX8997_MUICIRQ_ADCError: |
554 | case MAX8997_MUICIRQ_ADCLow: |
555 | case MAX8997_MUICIRQ_ADC: |
556 | /* Handle all of cable except for charger cable */ |
557 | ret = max8997_muic_adc_handler(info); |
558 | break; |
559 | case MAX8997_MUICIRQ_VBVolt: |
560 | case MAX8997_MUICIRQ_DBChg: |
561 | case MAX8997_MUICIRQ_DCDTmr: |
562 | case MAX8997_MUICIRQ_ChgDetRun: |
563 | case MAX8997_MUICIRQ_ChgTyp: |
564 | /* Handle charger cable */ |
565 | ret = max8997_muic_chg_handler(info); |
566 | break; |
567 | case MAX8997_MUICIRQ_OVP: |
568 | break; |
569 | default: |
570 | dev_info(info->dev, "misc interrupt: irq %d occurred\n", |
571 | irq_type); |
572 | mutex_unlock(&info->mutex); |
573 | return; |
574 | } |
575 | |
576 | if (ret < 0) |
577 | dev_err(info->dev, "failed to handle MUIC interrupt\n"); |
578 | |
579 | mutex_unlock(&info->mutex); |
580 | |
581 | return; |
582 | } |
583 | |
584 | static irqreturn_t max8997_muic_irq_handler(int irq, void *data) |
585 | { |
586 | struct max8997_muic_info *info = data; |
587 | |
588 | dev_dbg(info->dev, "irq:%d\n", irq); |
589 | info->irq = irq; |
590 | |
591 | schedule_work(&info->irq_work); |
592 | |
593 | return IRQ_HANDLED; |
594 | } |
595 | |
596 | static int max8997_muic_detect_dev(struct max8997_muic_info *info) |
597 | { |
598 | int ret = 0; |
599 | int adc; |
600 | int chg_type; |
601 | bool attached; |
602 | |
603 | mutex_lock(&info->mutex); |
604 | |
605 | /* Read STATUSx register to detect accessory */ |
606 | ret = max8997_bulk_read(info->muic, |
607 | MAX8997_MUIC_REG_STATUS1, 2, info->status); |
608 | if (ret) { |
609 | dev_err(info->dev, "failed to read MUIC register\n"); |
610 | mutex_unlock(&info->mutex); |
611 | return -EINVAL; |
612 | } |
613 | |
614 | adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC, |
615 | &attached); |
616 | if (attached && adc != MAX8997_MUIC_ADC_OPEN) { |
617 | ret = max8997_muic_adc_handler(info); |
618 | if (ret < 0) { |
619 | dev_err(info->dev, "Cannot detect ADC cable\n"); |
620 | mutex_unlock(&info->mutex); |
621 | return ret; |
622 | } |
623 | } |
624 | |
625 | chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG, |
626 | &attached); |
627 | if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) { |
628 | ret = max8997_muic_chg_handler(info); |
629 | if (ret < 0) { |
630 | dev_err(info->dev, "Cannot detect charger cable\n"); |
631 | mutex_unlock(&info->mutex); |
632 | return ret; |
633 | } |
634 | } |
635 | |
636 | mutex_unlock(&info->mutex); |
637 | |
638 | return 0; |
639 | } |
640 | |
641 | static void max8997_muic_detect_cable_wq(struct work_struct *work) |
642 | { |
643 | struct max8997_muic_info *info = container_of(to_delayed_work(work), |
644 | struct max8997_muic_info, wq_detcable); |
645 | int ret; |
646 | |
647 | ret = max8997_muic_detect_dev(info); |
648 | if (ret < 0) |
649 | pr_err("failed to detect cable type\n"); |
650 | } |
651 | |
652 | static int max8997_muic_probe(struct platform_device *pdev) |
653 | { |
654 | struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent); |
655 | struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev); |
656 | struct max8997_muic_info *info; |
657 | int delay_jiffies; |
658 | int ret, i; |
659 | |
660 | info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info), |
661 | GFP_KERNEL); |
662 | if (!info) { |
663 | dev_err(&pdev->dev, "failed to allocate memory\n"); |
664 | return -ENOMEM; |
665 | } |
666 | |
667 | info->dev = &pdev->dev; |
668 | info->muic = max8997->muic; |
669 | |
670 | platform_set_drvdata(pdev, info); |
671 | mutex_init(&info->mutex); |
672 | |
673 | INIT_WORK(&info->irq_work, max8997_muic_irq_work); |
674 | |
675 | for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) { |
676 | struct max8997_muic_irq *muic_irq = &muic_irqs[i]; |
677 | unsigned int virq = 0; |
678 | |
679 | virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq); |
680 | if (!virq) { |
681 | ret = -EINVAL; |
682 | goto err_irq; |
683 | } |
684 | muic_irq->virq = virq; |
685 | |
686 | ret = request_threaded_irq(virq, NULL, |
687 | max8997_muic_irq_handler, |
688 | IRQF_NO_SUSPEND, |
689 | muic_irq->name, info); |
690 | if (ret) { |
691 | dev_err(&pdev->dev, |
692 | "failed: irq request (IRQ: %d," |
693 | " error :%d)\n", |
694 | muic_irq->irq, ret); |
695 | goto err_irq; |
696 | } |
697 | } |
698 | |
699 | /* External connector */ |
700 | info->edev = devm_kzalloc(&pdev->dev, sizeof(struct extcon_dev), |
701 | GFP_KERNEL); |
702 | if (!info->edev) { |
703 | dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); |
704 | ret = -ENOMEM; |
705 | goto err_irq; |
706 | } |
707 | info->edev->name = DEV_NAME; |
708 | info->edev->supported_cable = max8997_extcon_cable; |
709 | ret = extcon_dev_register(info->edev, NULL); |
710 | if (ret) { |
711 | dev_err(&pdev->dev, "failed to register extcon device\n"); |
712 | goto err_irq; |
713 | } |
714 | |
715 | if (pdata->muic_pdata) { |
716 | struct max8997_muic_platform_data *muic_pdata |
717 | = pdata->muic_pdata; |
718 | |
719 | /* Initialize registers according to platform data */ |
720 | for (i = 0; i < muic_pdata->num_init_data; i++) { |
721 | max8997_write_reg(info->muic, |
722 | muic_pdata->init_data[i].addr, |
723 | muic_pdata->init_data[i].data); |
724 | } |
725 | |
726 | /* |
727 | * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB |
728 | * h/w path of COMP2/COMN1 on CONTROL1 register. |
729 | */ |
730 | if (muic_pdata->path_uart) |
731 | info->path_uart = muic_pdata->path_uart; |
732 | else |
733 | info->path_uart = CONTROL1_SW_UART; |
734 | |
735 | if (muic_pdata->path_usb) |
736 | info->path_usb = muic_pdata->path_usb; |
737 | else |
738 | info->path_usb = CONTROL1_SW_USB; |
739 | |
740 | /* |
741 | * Default delay time for detecting cable state |
742 | * after certain time. |
743 | */ |
744 | if (muic_pdata->detcable_delay_ms) |
745 | delay_jiffies = |
746 | msecs_to_jiffies(muic_pdata->detcable_delay_ms); |
747 | else |
748 | delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); |
749 | } else { |
750 | info->path_uart = CONTROL1_SW_UART; |
751 | info->path_usb = CONTROL1_SW_USB; |
752 | delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); |
753 | } |
754 | |
755 | /* Set initial path for UART */ |
756 | max8997_muic_set_path(info, info->path_uart, true); |
757 | |
758 | /* Set ADC debounce time */ |
759 | max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS); |
760 | |
761 | /* |
762 | * Detect accessory after completing the initialization of platform |
763 | * |
764 | * - Use delayed workqueue to detect cable state and then |
765 | * notify cable state to notifiee/platform through uevent. |
766 | * After completing the booting of platform, the extcon provider |
767 | * driver should notify cable state to upper layer. |
768 | */ |
769 | INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq); |
770 | schedule_delayed_work(&info->wq_detcable, delay_jiffies); |
771 | |
772 | return 0; |
773 | |
774 | err_irq: |
775 | while (--i >= 0) |
776 | free_irq(muic_irqs[i].virq, info); |
777 | return ret; |
778 | } |
779 | |
780 | static int max8997_muic_remove(struct platform_device *pdev) |
781 | { |
782 | struct max8997_muic_info *info = platform_get_drvdata(pdev); |
783 | int i; |
784 | |
785 | for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) |
786 | free_irq(muic_irqs[i].virq, info); |
787 | cancel_work_sync(&info->irq_work); |
788 | |
789 | extcon_dev_unregister(info->edev); |
790 | |
791 | return 0; |
792 | } |
793 | |
794 | static struct platform_driver max8997_muic_driver = { |
795 | .driver = { |
796 | .name = DEV_NAME, |
797 | .owner = THIS_MODULE, |
798 | }, |
799 | .probe = max8997_muic_probe, |
800 | .remove = max8997_muic_remove, |
801 | }; |
802 | |
803 | module_platform_driver(max8997_muic_driver); |
804 | |
805 | MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver"); |
806 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); |
807 | MODULE_LICENSE("GPL"); |
808 |
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