1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | // |
3 | // extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC |
4 | // |
5 | // Copyright (C) 2013,2014 Samsung Electronics |
6 | // Chanwoo Choi <cw00.choi@samsung.com> |
7 | // Krzysztof Kozlowski <krzk@kernel.org> |
8 | |
9 | #include <linux/devm-helpers.h> |
10 | #include <linux/kernel.h> |
11 | #include <linux/module.h> |
12 | #include <linux/i2c.h> |
13 | #include <linux/interrupt.h> |
14 | #include <linux/platform_device.h> |
15 | #include <linux/mfd/max14577.h> |
16 | #include <linux/mfd/max14577-private.h> |
17 | #include <linux/extcon-provider.h> |
18 | |
19 | #define DELAY_MS_DEFAULT 17000 /* unit: millisecond */ |
20 | |
21 | enum max14577_muic_adc_debounce_time { |
22 | ADC_DEBOUNCE_TIME_5MS = 0, |
23 | ADC_DEBOUNCE_TIME_10MS, |
24 | ADC_DEBOUNCE_TIME_25MS, |
25 | ADC_DEBOUNCE_TIME_38_62MS, |
26 | }; |
27 | |
28 | enum max14577_muic_status { |
29 | MAX14577_MUIC_STATUS1 = 0, |
30 | MAX14577_MUIC_STATUS2 = 1, |
31 | MAX14577_MUIC_STATUS_END, |
32 | }; |
33 | |
34 | /** |
35 | * struct max14577_muic_irq |
36 | * @irq: the index of irq list of MUIC device. |
37 | * @name: the name of irq. |
38 | * @virq: the virtual irq to use irq domain |
39 | */ |
40 | struct max14577_muic_irq { |
41 | unsigned int irq; |
42 | const char *name; |
43 | unsigned int virq; |
44 | }; |
45 | |
46 | static struct max14577_muic_irq max14577_muic_irqs[] = { |
47 | { MAX14577_IRQ_INT1_ADC, "muic-ADC" }, |
48 | { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" }, |
49 | { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" }, |
50 | { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" }, |
51 | { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" }, |
52 | { MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" }, |
53 | { MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" }, |
54 | { MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" }, |
55 | }; |
56 | |
57 | static struct max14577_muic_irq max77836_muic_irqs[] = { |
58 | { MAX14577_IRQ_INT1_ADC, "muic-ADC" }, |
59 | { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" }, |
60 | { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" }, |
61 | { MAX77836_IRQ_INT1_ADC1K, "muic-ADC1K" }, |
62 | { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" }, |
63 | { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" }, |
64 | { MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" }, |
65 | { MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" }, |
66 | { MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" }, |
67 | { MAX77836_IRQ_INT2_VIDRM, "muic-VIDRM" }, |
68 | }; |
69 | |
70 | struct max14577_muic_info { |
71 | struct device *dev; |
72 | struct max14577 *max14577; |
73 | struct extcon_dev *edev; |
74 | int prev_cable_type; |
75 | int prev_chg_type; |
76 | u8 status[MAX14577_MUIC_STATUS_END]; |
77 | |
78 | struct max14577_muic_irq *muic_irqs; |
79 | unsigned int muic_irqs_num; |
80 | bool irq_adc; |
81 | bool irq_chg; |
82 | struct work_struct irq_work; |
83 | struct mutex mutex; |
84 | |
85 | /* |
86 | * Use delayed workqueue to detect cable state and then |
87 | * notify cable state to notifiee/platform through uevent. |
88 | * After completing the booting of platform, the extcon provider |
89 | * driver should notify cable state to upper layer. |
90 | */ |
91 | struct delayed_work wq_detcable; |
92 | |
93 | /* |
94 | * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB |
95 | * h/w path of COMP2/COMN1 on CONTROL1 register. |
96 | */ |
97 | int path_usb; |
98 | int path_uart; |
99 | }; |
100 | |
101 | enum max14577_muic_cable_group { |
102 | MAX14577_CABLE_GROUP_ADC = 0, |
103 | MAX14577_CABLE_GROUP_CHG, |
104 | }; |
105 | |
106 | /* Define supported accessory type */ |
107 | enum max14577_muic_acc_type { |
108 | MAX14577_MUIC_ADC_GROUND = 0x0, |
109 | MAX14577_MUIC_ADC_SEND_END_BUTTON, |
110 | MAX14577_MUIC_ADC_REMOTE_S1_BUTTON, |
111 | MAX14577_MUIC_ADC_REMOTE_S2_BUTTON, |
112 | MAX14577_MUIC_ADC_REMOTE_S3_BUTTON, |
113 | MAX14577_MUIC_ADC_REMOTE_S4_BUTTON, |
114 | MAX14577_MUIC_ADC_REMOTE_S5_BUTTON, |
115 | MAX14577_MUIC_ADC_REMOTE_S6_BUTTON, |
116 | MAX14577_MUIC_ADC_REMOTE_S7_BUTTON, |
117 | MAX14577_MUIC_ADC_REMOTE_S8_BUTTON, |
118 | MAX14577_MUIC_ADC_REMOTE_S9_BUTTON, |
119 | MAX14577_MUIC_ADC_REMOTE_S10_BUTTON, |
120 | MAX14577_MUIC_ADC_REMOTE_S11_BUTTON, |
121 | MAX14577_MUIC_ADC_REMOTE_S12_BUTTON, |
122 | MAX14577_MUIC_ADC_RESERVED_ACC_1, |
123 | MAX14577_MUIC_ADC_RESERVED_ACC_2, |
124 | MAX14577_MUIC_ADC_RESERVED_ACC_3, |
125 | MAX14577_MUIC_ADC_RESERVED_ACC_4, |
126 | MAX14577_MUIC_ADC_RESERVED_ACC_5, |
127 | MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2, |
128 | MAX14577_MUIC_ADC_PHONE_POWERED_DEV, |
129 | MAX14577_MUIC_ADC_TTY_CONVERTER, |
130 | MAX14577_MUIC_ADC_UART_CABLE, |
131 | MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG, |
132 | MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF, |
133 | MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON, |
134 | MAX14577_MUIC_ADC_AV_CABLE_NOLOAD, |
135 | MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG, |
136 | MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF, |
137 | MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON, |
138 | MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */ |
139 | MAX14577_MUIC_ADC_OPEN, |
140 | }; |
141 | |
142 | static const unsigned int max14577_extcon_cable[] = { |
143 | EXTCON_USB, |
144 | EXTCON_CHG_USB_SDP, |
145 | EXTCON_CHG_USB_DCP, |
146 | EXTCON_CHG_USB_FAST, |
147 | EXTCON_CHG_USB_SLOW, |
148 | EXTCON_CHG_USB_CDP, |
149 | EXTCON_JIG, |
150 | EXTCON_NONE, |
151 | }; |
152 | |
153 | /* |
154 | * max14577_muic_set_debounce_time - Set the debounce time of ADC |
155 | * @info: the instance including private data of max14577 MUIC |
156 | * @time: the debounce time of ADC |
157 | */ |
158 | static int max14577_muic_set_debounce_time(struct max14577_muic_info *info, |
159 | enum max14577_muic_adc_debounce_time time) |
160 | { |
161 | u8 ret; |
162 | |
163 | switch (time) { |
164 | case ADC_DEBOUNCE_TIME_5MS: |
165 | case ADC_DEBOUNCE_TIME_10MS: |
166 | case ADC_DEBOUNCE_TIME_25MS: |
167 | case ADC_DEBOUNCE_TIME_38_62MS: |
168 | ret = max14577_update_reg(map: info->max14577->regmap, |
169 | reg: MAX14577_MUIC_REG_CONTROL3, |
170 | CTRL3_ADCDBSET_MASK, |
171 | val: time << CTRL3_ADCDBSET_SHIFT); |
172 | if (ret) { |
173 | dev_err(info->dev, "failed to set ADC debounce time\n" ); |
174 | return ret; |
175 | } |
176 | break; |
177 | default: |
178 | dev_err(info->dev, "invalid ADC debounce time\n" ); |
179 | return -EINVAL; |
180 | } |
181 | |
182 | return 0; |
183 | }; |
184 | |
185 | /* |
186 | * max14577_muic_set_path - Set hardware line according to attached cable |
187 | * @info: the instance including private data of max14577 MUIC |
188 | * @value: the path according to attached cable |
189 | * @attached: the state of cable (true:attached, false:detached) |
190 | * |
191 | * The max14577 MUIC device share outside H/W line among a varity of cables |
192 | * so, this function set internal path of H/W line according to the type of |
193 | * attached cable. |
194 | */ |
195 | static int max14577_muic_set_path(struct max14577_muic_info *info, |
196 | u8 val, bool attached) |
197 | { |
198 | u8 ctrl1, ctrl2 = 0; |
199 | int ret; |
200 | |
201 | /* Set open state to path before changing hw path */ |
202 | ret = max14577_update_reg(map: info->max14577->regmap, |
203 | reg: MAX14577_MUIC_REG_CONTROL1, |
204 | CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN); |
205 | if (ret < 0) { |
206 | dev_err(info->dev, "failed to update MUIC register\n" ); |
207 | return ret; |
208 | } |
209 | |
210 | if (attached) |
211 | ctrl1 = val; |
212 | else |
213 | ctrl1 = CTRL1_SW_OPEN; |
214 | |
215 | ret = max14577_update_reg(map: info->max14577->regmap, |
216 | reg: MAX14577_MUIC_REG_CONTROL1, |
217 | CLEAR_IDBEN_MICEN_MASK, val: ctrl1); |
218 | if (ret < 0) { |
219 | dev_err(info->dev, "failed to update MUIC register\n" ); |
220 | return ret; |
221 | } |
222 | |
223 | if (attached) |
224 | ctrl2 |= CTRL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */ |
225 | else |
226 | ctrl2 |= CTRL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */ |
227 | |
228 | ret = max14577_update_reg(map: info->max14577->regmap, |
229 | reg: MAX14577_REG_CONTROL2, |
230 | CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, val: ctrl2); |
231 | if (ret < 0) { |
232 | dev_err(info->dev, "failed to update MUIC register\n" ); |
233 | return ret; |
234 | } |
235 | |
236 | dev_dbg(info->dev, |
237 | "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n" , |
238 | ctrl1, ctrl2, attached ? "attached" : "detached" ); |
239 | |
240 | return 0; |
241 | } |
242 | |
243 | /* |
244 | * max14577_muic_get_cable_type - Return cable type and check cable state |
245 | * @info: the instance including private data of max14577 MUIC |
246 | * @group: the path according to attached cable |
247 | * @attached: store cable state and return |
248 | * |
249 | * This function check the cable state either attached or detached, |
250 | * and then divide precise type of cable according to cable group. |
251 | * - max14577_CABLE_GROUP_ADC |
252 | * - max14577_CABLE_GROUP_CHG |
253 | */ |
254 | static int max14577_muic_get_cable_type(struct max14577_muic_info *info, |
255 | enum max14577_muic_cable_group group, bool *attached) |
256 | { |
257 | int cable_type = 0; |
258 | int adc; |
259 | int chg_type; |
260 | |
261 | switch (group) { |
262 | case MAX14577_CABLE_GROUP_ADC: |
263 | /* |
264 | * Read ADC value to check cable type and decide cable state |
265 | * according to cable type |
266 | */ |
267 | adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK; |
268 | adc >>= STATUS1_ADC_SHIFT; |
269 | |
270 | /* |
271 | * Check current cable state/cable type and store cable type |
272 | * (info->prev_cable_type) for handling cable when cable is |
273 | * detached. |
274 | */ |
275 | if (adc == MAX14577_MUIC_ADC_OPEN) { |
276 | *attached = false; |
277 | |
278 | cable_type = info->prev_cable_type; |
279 | info->prev_cable_type = MAX14577_MUIC_ADC_OPEN; |
280 | } else { |
281 | *attached = true; |
282 | |
283 | cable_type = info->prev_cable_type = adc; |
284 | } |
285 | break; |
286 | case MAX14577_CABLE_GROUP_CHG: |
287 | /* |
288 | * Read charger type to check cable type and decide cable state |
289 | * according to type of charger cable. |
290 | */ |
291 | chg_type = info->status[MAX14577_MUIC_STATUS2] & |
292 | STATUS2_CHGTYP_MASK; |
293 | chg_type >>= STATUS2_CHGTYP_SHIFT; |
294 | |
295 | if (chg_type == MAX14577_CHARGER_TYPE_NONE) { |
296 | *attached = false; |
297 | |
298 | cable_type = info->prev_chg_type; |
299 | info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE; |
300 | } else { |
301 | *attached = true; |
302 | |
303 | /* |
304 | * Check current cable state/cable type and store cable |
305 | * type(info->prev_chg_type) for handling cable when |
306 | * charger cable is detached. |
307 | */ |
308 | cable_type = info->prev_chg_type = chg_type; |
309 | } |
310 | |
311 | break; |
312 | default: |
313 | dev_err(info->dev, "Unknown cable group (%d)\n" , group); |
314 | cable_type = -EINVAL; |
315 | break; |
316 | } |
317 | |
318 | return cable_type; |
319 | } |
320 | |
321 | static int max14577_muic_jig_handler(struct max14577_muic_info *info, |
322 | int cable_type, bool attached) |
323 | { |
324 | int ret = 0; |
325 | u8 path = CTRL1_SW_OPEN; |
326 | |
327 | dev_dbg(info->dev, |
328 | "external connector is %s (adc:0x%02x)\n" , |
329 | attached ? "attached" : "detached" , cable_type); |
330 | |
331 | switch (cable_type) { |
332 | case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: /* ADC_JIG_USB_OFF */ |
333 | case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: /* ADC_JIG_USB_ON */ |
334 | /* PATH:AP_USB */ |
335 | path = CTRL1_SW_USB; |
336 | break; |
337 | case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: /* ADC_JIG_UART_OFF */ |
338 | /* PATH:AP_UART */ |
339 | path = CTRL1_SW_UART; |
340 | break; |
341 | default: |
342 | dev_err(info->dev, "failed to detect %s jig cable\n" , |
343 | attached ? "attached" : "detached" ); |
344 | return -EINVAL; |
345 | } |
346 | |
347 | ret = max14577_muic_set_path(info, val: path, attached); |
348 | if (ret < 0) |
349 | return ret; |
350 | |
351 | extcon_set_state_sync(edev: info->edev, EXTCON_JIG, state: attached); |
352 | |
353 | return 0; |
354 | } |
355 | |
356 | static int max14577_muic_adc_handler(struct max14577_muic_info *info) |
357 | { |
358 | int cable_type; |
359 | bool attached; |
360 | int ret = 0; |
361 | |
362 | /* Check accessory state which is either detached or attached */ |
363 | cable_type = max14577_muic_get_cable_type(info, |
364 | group: MAX14577_CABLE_GROUP_ADC, attached: &attached); |
365 | |
366 | dev_dbg(info->dev, |
367 | "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n" , |
368 | attached ? "attached" : "detached" , cable_type, |
369 | info->prev_cable_type); |
370 | |
371 | switch (cable_type) { |
372 | case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: |
373 | case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: |
374 | case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: |
375 | /* JIG */ |
376 | ret = max14577_muic_jig_handler(info, cable_type, attached); |
377 | if (ret < 0) |
378 | return ret; |
379 | break; |
380 | case MAX14577_MUIC_ADC_GROUND: |
381 | case MAX14577_MUIC_ADC_SEND_END_BUTTON: |
382 | case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON: |
383 | case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON: |
384 | case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON: |
385 | case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON: |
386 | case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON: |
387 | case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON: |
388 | case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON: |
389 | case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON: |
390 | case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON: |
391 | case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON: |
392 | case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON: |
393 | case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON: |
394 | case MAX14577_MUIC_ADC_RESERVED_ACC_1: |
395 | case MAX14577_MUIC_ADC_RESERVED_ACC_2: |
396 | case MAX14577_MUIC_ADC_RESERVED_ACC_3: |
397 | case MAX14577_MUIC_ADC_RESERVED_ACC_4: |
398 | case MAX14577_MUIC_ADC_RESERVED_ACC_5: |
399 | case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2: |
400 | case MAX14577_MUIC_ADC_PHONE_POWERED_DEV: |
401 | case MAX14577_MUIC_ADC_TTY_CONVERTER: |
402 | case MAX14577_MUIC_ADC_UART_CABLE: |
403 | case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG: |
404 | case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD: |
405 | case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG: |
406 | case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON: |
407 | case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1: |
408 | /* |
409 | * This accessory isn't used in general case if it is specially |
410 | * needed to detect additional accessory, should implement |
411 | * proper operation when this accessory is attached/detached. |
412 | */ |
413 | dev_info(info->dev, |
414 | "accessory is %s but it isn't used (adc:0x%x)\n" , |
415 | attached ? "attached" : "detached" , cable_type); |
416 | return -EAGAIN; |
417 | default: |
418 | dev_err(info->dev, |
419 | "failed to detect %s accessory (adc:0x%x)\n" , |
420 | attached ? "attached" : "detached" , cable_type); |
421 | return -EINVAL; |
422 | } |
423 | |
424 | return 0; |
425 | } |
426 | |
427 | static int max14577_muic_chg_handler(struct max14577_muic_info *info) |
428 | { |
429 | int chg_type; |
430 | bool attached; |
431 | int ret = 0; |
432 | |
433 | chg_type = max14577_muic_get_cable_type(info, |
434 | group: MAX14577_CABLE_GROUP_CHG, attached: &attached); |
435 | |
436 | dev_dbg(info->dev, |
437 | "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n" , |
438 | attached ? "attached" : "detached" , |
439 | chg_type, info->prev_chg_type); |
440 | |
441 | switch (chg_type) { |
442 | case MAX14577_CHARGER_TYPE_USB: |
443 | /* PATH:AP_USB */ |
444 | ret = max14577_muic_set_path(info, val: info->path_usb, attached); |
445 | if (ret < 0) |
446 | return ret; |
447 | |
448 | extcon_set_state_sync(edev: info->edev, EXTCON_USB, state: attached); |
449 | extcon_set_state_sync(edev: info->edev, EXTCON_CHG_USB_SDP, |
450 | state: attached); |
451 | break; |
452 | case MAX14577_CHARGER_TYPE_DEDICATED_CHG: |
453 | extcon_set_state_sync(edev: info->edev, EXTCON_CHG_USB_DCP, |
454 | state: attached); |
455 | break; |
456 | case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT: |
457 | extcon_set_state_sync(edev: info->edev, EXTCON_CHG_USB_CDP, |
458 | state: attached); |
459 | break; |
460 | case MAX14577_CHARGER_TYPE_SPECIAL_500MA: |
461 | extcon_set_state_sync(edev: info->edev, EXTCON_CHG_USB_SLOW, |
462 | state: attached); |
463 | break; |
464 | case MAX14577_CHARGER_TYPE_SPECIAL_1A: |
465 | extcon_set_state_sync(edev: info->edev, EXTCON_CHG_USB_FAST, |
466 | state: attached); |
467 | break; |
468 | case MAX14577_CHARGER_TYPE_NONE: |
469 | case MAX14577_CHARGER_TYPE_DEAD_BATTERY: |
470 | break; |
471 | default: |
472 | dev_err(info->dev, |
473 | "failed to detect %s accessory (chg_type:0x%x)\n" , |
474 | attached ? "attached" : "detached" , chg_type); |
475 | return -EINVAL; |
476 | } |
477 | |
478 | return 0; |
479 | } |
480 | |
481 | static void max14577_muic_irq_work(struct work_struct *work) |
482 | { |
483 | struct max14577_muic_info *info = container_of(work, |
484 | struct max14577_muic_info, irq_work); |
485 | int ret = 0; |
486 | |
487 | if (!info->edev) |
488 | return; |
489 | |
490 | mutex_lock(&info->mutex); |
491 | |
492 | ret = max14577_bulk_read(map: info->max14577->regmap, |
493 | reg: MAX14577_MUIC_REG_STATUS1, buf: info->status, count: 2); |
494 | if (ret) { |
495 | dev_err(info->dev, "failed to read MUIC register\n" ); |
496 | mutex_unlock(lock: &info->mutex); |
497 | return; |
498 | } |
499 | |
500 | if (info->irq_adc) { |
501 | ret = max14577_muic_adc_handler(info); |
502 | info->irq_adc = false; |
503 | } |
504 | if (info->irq_chg) { |
505 | ret = max14577_muic_chg_handler(info); |
506 | info->irq_chg = false; |
507 | } |
508 | |
509 | if (ret < 0) |
510 | dev_err(info->dev, "failed to handle MUIC interrupt\n" ); |
511 | |
512 | mutex_unlock(lock: &info->mutex); |
513 | } |
514 | |
515 | /* |
516 | * Sets irq_adc or irq_chg in max14577_muic_info and returns 1. |
517 | * Returns 0 if irq_type does not match registered IRQ for this device type. |
518 | */ |
519 | static int max14577_parse_irq(struct max14577_muic_info *info, int irq_type) |
520 | { |
521 | switch (irq_type) { |
522 | case MAX14577_IRQ_INT1_ADC: |
523 | case MAX14577_IRQ_INT1_ADCLOW: |
524 | case MAX14577_IRQ_INT1_ADCERR: |
525 | /* |
526 | * Handle all of accessory except for |
527 | * type of charger accessory. |
528 | */ |
529 | info->irq_adc = true; |
530 | return 1; |
531 | case MAX14577_IRQ_INT2_CHGTYP: |
532 | case MAX14577_IRQ_INT2_CHGDETRUN: |
533 | case MAX14577_IRQ_INT2_DCDTMR: |
534 | case MAX14577_IRQ_INT2_DBCHG: |
535 | case MAX14577_IRQ_INT2_VBVOLT: |
536 | /* Handle charger accessory */ |
537 | info->irq_chg = true; |
538 | return 1; |
539 | default: |
540 | return 0; |
541 | } |
542 | } |
543 | |
544 | /* |
545 | * Sets irq_adc or irq_chg in max14577_muic_info and returns 1. |
546 | * Returns 0 if irq_type does not match registered IRQ for this device type. |
547 | */ |
548 | static int max77836_parse_irq(struct max14577_muic_info *info, int irq_type) |
549 | { |
550 | /* First check common max14577 interrupts */ |
551 | if (max14577_parse_irq(info, irq_type)) |
552 | return 1; |
553 | |
554 | switch (irq_type) { |
555 | case MAX77836_IRQ_INT1_ADC1K: |
556 | info->irq_adc = true; |
557 | return 1; |
558 | case MAX77836_IRQ_INT2_VIDRM: |
559 | /* Handle charger accessory */ |
560 | info->irq_chg = true; |
561 | return 1; |
562 | default: |
563 | return 0; |
564 | } |
565 | } |
566 | |
567 | static irqreturn_t max14577_muic_irq_handler(int irq, void *data) |
568 | { |
569 | struct max14577_muic_info *info = data; |
570 | int i, irq_type = -1; |
571 | bool irq_parsed; |
572 | |
573 | /* |
574 | * We may be called multiple times for different nested IRQ-s. |
575 | * Including changes in INT1_ADC and INT2_CGHTYP at once. |
576 | * However we only need to know whether it was ADC, charger |
577 | * or both interrupts so decode IRQ and turn on proper flags. |
578 | */ |
579 | for (i = 0; i < info->muic_irqs_num; i++) |
580 | if (irq == info->muic_irqs[i].virq) |
581 | irq_type = info->muic_irqs[i].irq; |
582 | |
583 | switch (info->max14577->dev_type) { |
584 | case MAXIM_DEVICE_TYPE_MAX77836: |
585 | irq_parsed = max77836_parse_irq(info, irq_type); |
586 | break; |
587 | case MAXIM_DEVICE_TYPE_MAX14577: |
588 | default: |
589 | irq_parsed = max14577_parse_irq(info, irq_type); |
590 | break; |
591 | } |
592 | |
593 | if (!irq_parsed) { |
594 | dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n" , |
595 | irq_type); |
596 | return IRQ_HANDLED; |
597 | } |
598 | schedule_work(work: &info->irq_work); |
599 | |
600 | return IRQ_HANDLED; |
601 | } |
602 | |
603 | static int max14577_muic_detect_accessory(struct max14577_muic_info *info) |
604 | { |
605 | int ret = 0; |
606 | int adc; |
607 | int chg_type; |
608 | bool attached; |
609 | |
610 | mutex_lock(&info->mutex); |
611 | |
612 | /* Read STATUSx register to detect accessory */ |
613 | ret = max14577_bulk_read(map: info->max14577->regmap, |
614 | reg: MAX14577_MUIC_REG_STATUS1, buf: info->status, count: 2); |
615 | if (ret) { |
616 | dev_err(info->dev, "failed to read MUIC register\n" ); |
617 | mutex_unlock(lock: &info->mutex); |
618 | return ret; |
619 | } |
620 | |
621 | adc = max14577_muic_get_cable_type(info, group: MAX14577_CABLE_GROUP_ADC, |
622 | attached: &attached); |
623 | if (attached && adc != MAX14577_MUIC_ADC_OPEN) { |
624 | ret = max14577_muic_adc_handler(info); |
625 | if (ret < 0) { |
626 | dev_err(info->dev, "Cannot detect accessory\n" ); |
627 | mutex_unlock(lock: &info->mutex); |
628 | return ret; |
629 | } |
630 | } |
631 | |
632 | chg_type = max14577_muic_get_cable_type(info, group: MAX14577_CABLE_GROUP_CHG, |
633 | attached: &attached); |
634 | if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) { |
635 | ret = max14577_muic_chg_handler(info); |
636 | if (ret < 0) { |
637 | dev_err(info->dev, "Cannot detect charger accessory\n" ); |
638 | mutex_unlock(lock: &info->mutex); |
639 | return ret; |
640 | } |
641 | } |
642 | |
643 | mutex_unlock(lock: &info->mutex); |
644 | |
645 | return 0; |
646 | } |
647 | |
648 | static void max14577_muic_detect_cable_wq(struct work_struct *work) |
649 | { |
650 | struct max14577_muic_info *info = container_of(to_delayed_work(work), |
651 | struct max14577_muic_info, wq_detcable); |
652 | |
653 | max14577_muic_detect_accessory(info); |
654 | } |
655 | |
656 | static int max14577_muic_probe(struct platform_device *pdev) |
657 | { |
658 | struct max14577 *max14577 = dev_get_drvdata(dev: pdev->dev.parent); |
659 | struct max14577_muic_info *info; |
660 | int delay_jiffies; |
661 | int cable_type; |
662 | bool attached; |
663 | int ret; |
664 | int i; |
665 | u8 id; |
666 | |
667 | info = devm_kzalloc(dev: &pdev->dev, size: sizeof(*info), GFP_KERNEL); |
668 | if (!info) |
669 | return -ENOMEM; |
670 | |
671 | info->dev = &pdev->dev; |
672 | info->max14577 = max14577; |
673 | |
674 | platform_set_drvdata(pdev, data: info); |
675 | mutex_init(&info->mutex); |
676 | |
677 | ret = devm_work_autocancel(dev: &pdev->dev, w: &info->irq_work, |
678 | worker: max14577_muic_irq_work); |
679 | if (ret) |
680 | return ret; |
681 | |
682 | switch (max14577->dev_type) { |
683 | case MAXIM_DEVICE_TYPE_MAX77836: |
684 | info->muic_irqs = max77836_muic_irqs; |
685 | info->muic_irqs_num = ARRAY_SIZE(max77836_muic_irqs); |
686 | break; |
687 | case MAXIM_DEVICE_TYPE_MAX14577: |
688 | default: |
689 | info->muic_irqs = max14577_muic_irqs; |
690 | info->muic_irqs_num = ARRAY_SIZE(max14577_muic_irqs); |
691 | } |
692 | |
693 | /* Support irq domain for max14577 MUIC device */ |
694 | for (i = 0; i < info->muic_irqs_num; i++) { |
695 | struct max14577_muic_irq *muic_irq = &info->muic_irqs[i]; |
696 | int virq = 0; |
697 | |
698 | virq = regmap_irq_get_virq(data: max14577->irq_data, irq: muic_irq->irq); |
699 | if (virq <= 0) |
700 | return -EINVAL; |
701 | muic_irq->virq = virq; |
702 | |
703 | ret = devm_request_threaded_irq(dev: &pdev->dev, irq: virq, NULL, |
704 | thread_fn: max14577_muic_irq_handler, |
705 | IRQF_NO_SUSPEND, |
706 | devname: muic_irq->name, dev_id: info); |
707 | if (ret) { |
708 | dev_err(&pdev->dev, |
709 | "failed: irq request (IRQ: %d, error :%d)\n" , |
710 | muic_irq->irq, ret); |
711 | return ret; |
712 | } |
713 | } |
714 | |
715 | /* Initialize extcon device */ |
716 | info->edev = devm_extcon_dev_allocate(dev: &pdev->dev, |
717 | cable: max14577_extcon_cable); |
718 | if (IS_ERR(ptr: info->edev)) { |
719 | dev_err(&pdev->dev, "failed to allocate memory for extcon\n" ); |
720 | return PTR_ERR(ptr: info->edev); |
721 | } |
722 | |
723 | ret = devm_extcon_dev_register(dev: &pdev->dev, edev: info->edev); |
724 | if (ret) { |
725 | dev_err(&pdev->dev, "failed to register extcon device\n" ); |
726 | return ret; |
727 | } |
728 | |
729 | /* Default h/w line path */ |
730 | info->path_usb = CTRL1_SW_USB; |
731 | info->path_uart = CTRL1_SW_UART; |
732 | delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); |
733 | |
734 | /* Set initial path for UART when JIG is connected to get serial logs */ |
735 | ret = max14577_bulk_read(map: info->max14577->regmap, |
736 | reg: MAX14577_MUIC_REG_STATUS1, buf: info->status, count: 2); |
737 | if (ret) { |
738 | dev_err(info->dev, "Cannot read STATUS registers\n" ); |
739 | return ret; |
740 | } |
741 | cable_type = max14577_muic_get_cable_type(info, group: MAX14577_CABLE_GROUP_ADC, |
742 | attached: &attached); |
743 | if (attached && cable_type == MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF) |
744 | max14577_muic_set_path(info, val: info->path_uart, attached: true); |
745 | |
746 | /* Check revision number of MUIC device*/ |
747 | ret = max14577_read_reg(map: info->max14577->regmap, |
748 | reg: MAX14577_REG_DEVICEID, dest: &id); |
749 | if (ret < 0) { |
750 | dev_err(&pdev->dev, "failed to read revision number\n" ); |
751 | return ret; |
752 | } |
753 | dev_info(info->dev, "device ID : 0x%x\n" , id); |
754 | |
755 | /* Set ADC debounce time */ |
756 | max14577_muic_set_debounce_time(info, time: ADC_DEBOUNCE_TIME_25MS); |
757 | |
758 | /* |
759 | * Detect accessory after completing the initialization of platform |
760 | * |
761 | * - Use delayed workqueue to detect cable state and then |
762 | * notify cable state to notifiee/platform through uevent. |
763 | * After completing the booting of platform, the extcon provider |
764 | * driver should notify cable state to upper layer. |
765 | */ |
766 | INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq); |
767 | queue_delayed_work(wq: system_power_efficient_wq, dwork: &info->wq_detcable, |
768 | delay: delay_jiffies); |
769 | |
770 | return ret; |
771 | } |
772 | |
773 | static const struct platform_device_id max14577_muic_id[] = { |
774 | { "max14577-muic" , MAXIM_DEVICE_TYPE_MAX14577, }, |
775 | { "max77836-muic" , MAXIM_DEVICE_TYPE_MAX77836, }, |
776 | { } |
777 | }; |
778 | MODULE_DEVICE_TABLE(platform, max14577_muic_id); |
779 | |
780 | static const struct of_device_id of_max14577_muic_dt_match[] = { |
781 | { .compatible = "maxim,max14577-muic" , |
782 | .data = (void *)MAXIM_DEVICE_TYPE_MAX14577, }, |
783 | { .compatible = "maxim,max77836-muic" , |
784 | .data = (void *)MAXIM_DEVICE_TYPE_MAX77836, }, |
785 | { }, |
786 | }; |
787 | MODULE_DEVICE_TABLE(of, of_max14577_muic_dt_match); |
788 | |
789 | static struct platform_driver max14577_muic_driver = { |
790 | .driver = { |
791 | .name = "max14577-muic" , |
792 | .of_match_table = of_max14577_muic_dt_match, |
793 | }, |
794 | .probe = max14577_muic_probe, |
795 | .id_table = max14577_muic_id, |
796 | }; |
797 | |
798 | module_platform_driver(max14577_muic_driver); |
799 | |
800 | MODULE_DESCRIPTION("Maxim 14577/77836 Extcon driver" ); |
801 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>" ); |
802 | MODULE_LICENSE("GPL" ); |
803 | MODULE_ALIAS("platform:extcon-max14577" ); |
804 | |