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1 | /* |
2 | * extcon-max14577.c - MAX14577 extcon driver to support MAX14577 MUIC | |
3 | * | |
4 | * Copyright (C) 2013 Samsung Electrnoics | |
5 | * Chanwoo Choi <cw00.choi@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/interrupt.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/mfd/max14577.h> | |
24 | #include <linux/mfd/max14577-private.h> | |
25 | #include <linux/extcon.h> | |
26 | ||
27 | #define DEV_NAME "max14577-muic" | |
28 | #define DELAY_MS_DEFAULT 17000 /* unit: millisecond */ | |
29 | ||
30 | enum max14577_muic_adc_debounce_time { | |
31 | ADC_DEBOUNCE_TIME_5MS = 0, | |
32 | ADC_DEBOUNCE_TIME_10MS, | |
33 | ADC_DEBOUNCE_TIME_25MS, | |
34 | ADC_DEBOUNCE_TIME_38_62MS, | |
35 | }; | |
36 | ||
37 | enum max14577_muic_status { | |
38 | MAX14577_MUIC_STATUS1 = 0, | |
39 | MAX14577_MUIC_STATUS2 = 1, | |
40 | MAX14577_MUIC_STATUS_END, | |
41 | }; | |
42 | ||
43 | struct max14577_muic_info { | |
44 | struct device *dev; | |
45 | struct max14577 *max14577; | |
46 | struct extcon_dev *edev; | |
47 | int prev_cable_type; | |
48 | int prev_chg_type; | |
49 | u8 status[MAX14577_MUIC_STATUS_END]; | |
50 | ||
51 | bool irq_adc; | |
52 | bool irq_chg; | |
53 | struct work_struct irq_work; | |
54 | struct mutex mutex; | |
55 | ||
56 | /* | |
57 | * Use delayed workqueue to detect cable state and then | |
58 | * notify cable state to notifiee/platform through uevent. | |
59 | * After completing the booting of platform, the extcon provider | |
60 | * driver should notify cable state to upper layer. | |
61 | */ | |
62 | struct delayed_work wq_detcable; | |
63 | ||
64 | /* | |
65 | * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB | |
66 | * h/w path of COMP2/COMN1 on CONTROL1 register. | |
67 | */ | |
68 | int path_usb; | |
69 | int path_uart; | |
70 | }; | |
71 | ||
72 | enum max14577_muic_cable_group { | |
73 | MAX14577_CABLE_GROUP_ADC = 0, | |
74 | MAX14577_CABLE_GROUP_CHG, | |
75 | }; | |
76 | ||
77 | /** | |
78 | * struct max14577_muic_irq | |
79 | * @irq: the index of irq list of MUIC device. | |
80 | * @name: the name of irq. | |
81 | * @virq: the virtual irq to use irq domain | |
82 | */ | |
83 | struct max14577_muic_irq { | |
84 | unsigned int irq; | |
85 | const char *name; | |
86 | unsigned int virq; | |
87 | }; | |
88 | ||
89 | static struct max14577_muic_irq muic_irqs[] = { | |
90 | { MAX14577_IRQ_INT1_ADC, "muic-ADC" }, | |
91 | { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" }, | |
92 | { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" }, | |
93 | { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" }, | |
94 | { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" }, | |
95 | { MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" }, | |
96 | { MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" }, | |
97 | { MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" }, | |
98 | }; | |
99 | ||
100 | /* Define supported accessory type */ | |
101 | enum max14577_muic_acc_type { | |
102 | MAX14577_MUIC_ADC_GROUND = 0x0, | |
103 | MAX14577_MUIC_ADC_SEND_END_BUTTON, | |
104 | MAX14577_MUIC_ADC_REMOTE_S1_BUTTON, | |
105 | MAX14577_MUIC_ADC_REMOTE_S2_BUTTON, | |
106 | MAX14577_MUIC_ADC_REMOTE_S3_BUTTON, | |
107 | MAX14577_MUIC_ADC_REMOTE_S4_BUTTON, | |
108 | MAX14577_MUIC_ADC_REMOTE_S5_BUTTON, | |
109 | MAX14577_MUIC_ADC_REMOTE_S6_BUTTON, | |
110 | MAX14577_MUIC_ADC_REMOTE_S7_BUTTON, | |
111 | MAX14577_MUIC_ADC_REMOTE_S8_BUTTON, | |
112 | MAX14577_MUIC_ADC_REMOTE_S9_BUTTON, | |
113 | MAX14577_MUIC_ADC_REMOTE_S10_BUTTON, | |
114 | MAX14577_MUIC_ADC_REMOTE_S11_BUTTON, | |
115 | MAX14577_MUIC_ADC_REMOTE_S12_BUTTON, | |
116 | MAX14577_MUIC_ADC_RESERVED_ACC_1, | |
117 | MAX14577_MUIC_ADC_RESERVED_ACC_2, | |
118 | MAX14577_MUIC_ADC_RESERVED_ACC_3, | |
119 | MAX14577_MUIC_ADC_RESERVED_ACC_4, | |
120 | MAX14577_MUIC_ADC_RESERVED_ACC_5, | |
121 | MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2, | |
122 | MAX14577_MUIC_ADC_PHONE_POWERED_DEV, | |
123 | MAX14577_MUIC_ADC_TTY_CONVERTER, | |
124 | MAX14577_MUIC_ADC_UART_CABLE, | |
125 | MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG, | |
126 | MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF, | |
127 | MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON, | |
128 | MAX14577_MUIC_ADC_AV_CABLE_NOLOAD, | |
129 | MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG, | |
130 | MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF, | |
131 | MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON, | |
132 | MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */ | |
133 | MAX14577_MUIC_ADC_OPEN, | |
134 | }; | |
135 | ||
136 | /* max14577 MUIC device support below list of accessories(external connector) */ | |
137 | enum { | |
138 | EXTCON_CABLE_USB = 0, | |
139 | EXTCON_CABLE_TA, | |
140 | EXTCON_CABLE_FAST_CHARGER, | |
141 | EXTCON_CABLE_SLOW_CHARGER, | |
142 | EXTCON_CABLE_CHARGE_DOWNSTREAM, | |
143 | EXTCON_CABLE_JIG_USB_ON, | |
144 | EXTCON_CABLE_JIG_USB_OFF, | |
145 | EXTCON_CABLE_JIG_UART_OFF, | |
146 | EXTCON_CABLE_JIG_UART_ON, | |
147 | ||
148 | _EXTCON_CABLE_NUM, | |
149 | }; | |
150 | ||
151 | static const char *max14577_extcon_cable[] = { | |
152 | [EXTCON_CABLE_USB] = "USB", | |
153 | [EXTCON_CABLE_TA] = "TA", | |
154 | [EXTCON_CABLE_FAST_CHARGER] = "Fast-charger", | |
155 | [EXTCON_CABLE_SLOW_CHARGER] = "Slow-charger", | |
156 | [EXTCON_CABLE_CHARGE_DOWNSTREAM] = "Charge-downstream", | |
157 | [EXTCON_CABLE_JIG_USB_ON] = "JIG-USB-ON", | |
158 | [EXTCON_CABLE_JIG_USB_OFF] = "JIG-USB-OFF", | |
159 | [EXTCON_CABLE_JIG_UART_OFF] = "JIG-UART-OFF", | |
160 | [EXTCON_CABLE_JIG_UART_ON] = "JIG-UART-ON", | |
161 | ||
162 | NULL, | |
163 | }; | |
164 | ||
165 | /* | |
166 | * max14577_muic_set_debounce_time - Set the debounce time of ADC | |
167 | * @info: the instance including private data of max14577 MUIC | |
168 | * @time: the debounce time of ADC | |
169 | */ | |
170 | static int max14577_muic_set_debounce_time(struct max14577_muic_info *info, | |
171 | enum max14577_muic_adc_debounce_time time) | |
172 | { | |
173 | u8 ret; | |
174 | ||
175 | switch (time) { | |
176 | case ADC_DEBOUNCE_TIME_5MS: | |
177 | case ADC_DEBOUNCE_TIME_10MS: | |
178 | case ADC_DEBOUNCE_TIME_25MS: | |
179 | case ADC_DEBOUNCE_TIME_38_62MS: | |
180 | ret = max14577_update_reg(info->max14577->regmap, | |
181 | MAX14577_MUIC_REG_CONTROL3, | |
182 | CTRL3_ADCDBSET_MASK, | |
183 | time << CTRL3_ADCDBSET_SHIFT); | |
184 | if (ret) { | |
185 | dev_err(info->dev, "failed to set ADC debounce time\n"); | |
186 | return ret; | |
187 | } | |
188 | break; | |
189 | default: | |
190 | dev_err(info->dev, "invalid ADC debounce time\n"); | |
191 | return -EINVAL; | |
192 | } | |
193 | ||
194 | return 0; | |
195 | }; | |
196 | ||
197 | /* | |
198 | * max14577_muic_set_path - Set hardware line according to attached cable | |
199 | * @info: the instance including private data of max14577 MUIC | |
200 | * @value: the path according to attached cable | |
201 | * @attached: the state of cable (true:attached, false:detached) | |
202 | * | |
203 | * The max14577 MUIC device share outside H/W line among a varity of cables | |
204 | * so, this function set internal path of H/W line according to the type of | |
205 | * attached cable. | |
206 | */ | |
207 | static int max14577_muic_set_path(struct max14577_muic_info *info, | |
208 | u8 val, bool attached) | |
209 | { | |
210 | int ret = 0; | |
211 | u8 ctrl1, ctrl2 = 0; | |
212 | ||
213 | /* Set open state to path before changing hw path */ | |
214 | ret = max14577_update_reg(info->max14577->regmap, | |
215 | MAX14577_MUIC_REG_CONTROL1, | |
216 | CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN); | |
217 | if (ret < 0) { | |
218 | dev_err(info->dev, "failed to update MUIC register\n"); | |
219 | return ret; | |
220 | } | |
221 | ||
222 | if (attached) | |
223 | ctrl1 = val; | |
224 | else | |
225 | ctrl1 = CTRL1_SW_OPEN; | |
226 | ||
227 | ret = max14577_update_reg(info->max14577->regmap, | |
228 | MAX14577_MUIC_REG_CONTROL1, | |
229 | CLEAR_IDBEN_MICEN_MASK, ctrl1); | |
230 | if (ret < 0) { | |
231 | dev_err(info->dev, "failed to update MUIC register\n"); | |
232 | return ret; | |
233 | } | |
234 | ||
235 | if (attached) | |
236 | ctrl2 |= CTRL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */ | |
237 | else | |
238 | ctrl2 |= CTRL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */ | |
239 | ||
240 | ret = max14577_update_reg(info->max14577->regmap, | |
241 | MAX14577_REG_CONTROL2, | |
242 | CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2); | |
243 | if (ret < 0) { | |
244 | dev_err(info->dev, "failed to update MUIC register\n"); | |
245 | return ret; | |
246 | } | |
247 | ||
248 | dev_dbg(info->dev, | |
249 | "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n", | |
250 | ctrl1, ctrl2, attached ? "attached" : "detached"); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | /* | |
256 | * max14577_muic_get_cable_type - Return cable type and check cable state | |
257 | * @info: the instance including private data of max14577 MUIC | |
258 | * @group: the path according to attached cable | |
259 | * @attached: store cable state and return | |
260 | * | |
261 | * This function check the cable state either attached or detached, | |
262 | * and then divide precise type of cable according to cable group. | |
263 | * - max14577_CABLE_GROUP_ADC | |
264 | * - max14577_CABLE_GROUP_CHG | |
265 | */ | |
266 | static int max14577_muic_get_cable_type(struct max14577_muic_info *info, | |
267 | enum max14577_muic_cable_group group, bool *attached) | |
268 | { | |
269 | int cable_type = 0; | |
270 | int adc; | |
271 | int chg_type; | |
272 | ||
273 | switch (group) { | |
274 | case MAX14577_CABLE_GROUP_ADC: | |
275 | /* | |
276 | * Read ADC value to check cable type and decide cable state | |
277 | * according to cable type | |
278 | */ | |
279 | adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK; | |
280 | adc >>= STATUS1_ADC_SHIFT; | |
281 | ||
282 | /* | |
283 | * Check current cable state/cable type and store cable type | |
284 | * (info->prev_cable_type) for handling cable when cable is | |
285 | * detached. | |
286 | */ | |
287 | if (adc == MAX14577_MUIC_ADC_OPEN) { | |
288 | *attached = false; | |
289 | ||
290 | cable_type = info->prev_cable_type; | |
291 | info->prev_cable_type = MAX14577_MUIC_ADC_OPEN; | |
292 | } else { | |
293 | *attached = true; | |
294 | ||
295 | cable_type = info->prev_cable_type = adc; | |
296 | } | |
297 | break; | |
298 | case MAX14577_CABLE_GROUP_CHG: | |
299 | /* | |
300 | * Read charger type to check cable type and decide cable state | |
301 | * according to type of charger cable. | |
302 | */ | |
303 | chg_type = info->status[MAX14577_MUIC_STATUS2] & | |
304 | STATUS2_CHGTYP_MASK; | |
305 | chg_type >>= STATUS2_CHGTYP_SHIFT; | |
306 | ||
307 | if (chg_type == MAX14577_CHARGER_TYPE_NONE) { | |
308 | *attached = false; | |
309 | ||
310 | cable_type = info->prev_chg_type; | |
311 | info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE; | |
312 | } else { | |
313 | *attached = true; | |
314 | ||
315 | /* | |
316 | * Check current cable state/cable type and store cable | |
317 | * type(info->prev_chg_type) for handling cable when | |
318 | * charger cable is detached. | |
319 | */ | |
320 | cable_type = info->prev_chg_type = chg_type; | |
321 | } | |
322 | ||
323 | break; | |
324 | default: | |
325 | dev_err(info->dev, "Unknown cable group (%d)\n", group); | |
326 | cable_type = -EINVAL; | |
327 | break; | |
328 | } | |
329 | ||
330 | return cable_type; | |
331 | } | |
332 | ||
333 | static int max14577_muic_jig_handler(struct max14577_muic_info *info, | |
334 | int cable_type, bool attached) | |
335 | { | |
336 | char cable_name[32]; | |
337 | int ret = 0; | |
338 | u8 path = CTRL1_SW_OPEN; | |
339 | ||
340 | dev_dbg(info->dev, | |
341 | "external connector is %s (adc:0x%02x)\n", | |
342 | attached ? "attached" : "detached", cable_type); | |
343 | ||
344 | switch (cable_type) { | |
345 | case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: /* ADC_JIG_USB_OFF */ | |
346 | /* PATH:AP_USB */ | |
347 | strcpy(cable_name, "JIG-USB-OFF"); | |
348 | path = CTRL1_SW_USB; | |
349 | break; | |
350 | case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: /* ADC_JIG_USB_ON */ | |
351 | /* PATH:AP_USB */ | |
352 | strcpy(cable_name, "JIG-USB-ON"); | |
353 | path = CTRL1_SW_USB; | |
354 | break; | |
355 | case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: /* ADC_JIG_UART_OFF */ | |
356 | /* PATH:AP_UART */ | |
357 | strcpy(cable_name, "JIG-UART-OFF"); | |
358 | path = CTRL1_SW_UART; | |
359 | break; | |
360 | default: | |
361 | dev_err(info->dev, "failed to detect %s jig cable\n", | |
362 | attached ? "attached" : "detached"); | |
363 | return -EINVAL; | |
364 | } | |
365 | ||
366 | ret = max14577_muic_set_path(info, path, attached); | |
367 | if (ret < 0) | |
368 | return ret; | |
369 | ||
370 | extcon_set_cable_state(info->edev, cable_name, attached); | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | static int max14577_muic_adc_handler(struct max14577_muic_info *info) | |
376 | { | |
377 | int cable_type; | |
378 | bool attached; | |
379 | int ret = 0; | |
380 | ||
381 | /* Check accessory state which is either detached or attached */ | |
382 | cable_type = max14577_muic_get_cable_type(info, | |
383 | MAX14577_CABLE_GROUP_ADC, &attached); | |
384 | ||
385 | dev_dbg(info->dev, | |
386 | "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n", | |
387 | attached ? "attached" : "detached", cable_type, | |
388 | info->prev_cable_type); | |
389 | ||
390 | switch (cable_type) { | |
391 | case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: | |
392 | case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: | |
393 | case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: | |
394 | /* JIG */ | |
395 | ret = max14577_muic_jig_handler(info, cable_type, attached); | |
396 | if (ret < 0) | |
397 | return ret; | |
398 | break; | |
399 | case MAX14577_MUIC_ADC_GROUND: | |
400 | case MAX14577_MUIC_ADC_SEND_END_BUTTON: | |
401 | case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON: | |
402 | case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON: | |
403 | case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON: | |
404 | case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON: | |
405 | case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON: | |
406 | case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON: | |
407 | case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON: | |
408 | case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON: | |
409 | case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON: | |
410 | case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON: | |
411 | case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON: | |
412 | case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON: | |
413 | case MAX14577_MUIC_ADC_RESERVED_ACC_1: | |
414 | case MAX14577_MUIC_ADC_RESERVED_ACC_2: | |
415 | case MAX14577_MUIC_ADC_RESERVED_ACC_3: | |
416 | case MAX14577_MUIC_ADC_RESERVED_ACC_4: | |
417 | case MAX14577_MUIC_ADC_RESERVED_ACC_5: | |
418 | case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2: | |
419 | case MAX14577_MUIC_ADC_PHONE_POWERED_DEV: | |
420 | case MAX14577_MUIC_ADC_TTY_CONVERTER: | |
421 | case MAX14577_MUIC_ADC_UART_CABLE: | |
422 | case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG: | |
423 | case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD: | |
424 | case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG: | |
425 | case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON: | |
426 | case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1: | |
427 | /* | |
428 | * This accessory isn't used in general case if it is specially | |
429 | * needed to detect additional accessory, should implement | |
430 | * proper operation when this accessory is attached/detached. | |
431 | */ | |
432 | dev_info(info->dev, | |
433 | "accessory is %s but it isn't used (adc:0x%x)\n", | |
434 | attached ? "attached" : "detached", cable_type); | |
435 | return -EAGAIN; | |
436 | default: | |
437 | dev_err(info->dev, | |
438 | "failed to detect %s accessory (adc:0x%x)\n", | |
439 | attached ? "attached" : "detached", cable_type); | |
440 | return -EINVAL; | |
441 | } | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
446 | static int max14577_muic_chg_handler(struct max14577_muic_info *info) | |
447 | { | |
448 | int chg_type; | |
449 | bool attached; | |
450 | int ret = 0; | |
451 | ||
452 | chg_type = max14577_muic_get_cable_type(info, | |
453 | MAX14577_CABLE_GROUP_CHG, &attached); | |
454 | ||
455 | dev_dbg(info->dev, | |
456 | "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n", | |
457 | attached ? "attached" : "detached", | |
458 | chg_type, info->prev_chg_type); | |
459 | ||
460 | switch (chg_type) { | |
461 | case MAX14577_CHARGER_TYPE_USB: | |
462 | /* PATH:AP_USB */ | |
463 | ret = max14577_muic_set_path(info, info->path_usb, attached); | |
464 | if (ret < 0) | |
465 | return ret; | |
466 | ||
467 | extcon_set_cable_state(info->edev, "USB", attached); | |
468 | break; | |
469 | case MAX14577_CHARGER_TYPE_DEDICATED_CHG: | |
470 | extcon_set_cable_state(info->edev, "TA", attached); | |
471 | break; | |
472 | case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT: | |
473 | extcon_set_cable_state(info->edev, | |
474 | "Charge-downstream", attached); | |
475 | break; | |
476 | case MAX14577_CHARGER_TYPE_SPECIAL_500MA: | |
477 | extcon_set_cable_state(info->edev, "Slow-charger", attached); | |
478 | break; | |
479 | case MAX14577_CHARGER_TYPE_SPECIAL_1A: | |
480 | extcon_set_cable_state(info->edev, "Fast-charger", attached); | |
481 | break; | |
482 | case MAX14577_CHARGER_TYPE_NONE: | |
483 | case MAX14577_CHARGER_TYPE_DEAD_BATTERY: | |
484 | break; | |
485 | default: | |
486 | dev_err(info->dev, | |
487 | "failed to detect %s accessory (chg_type:0x%x)\n", | |
488 | attached ? "attached" : "detached", chg_type); | |
489 | return -EINVAL; | |
490 | } | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
495 | static void max14577_muic_irq_work(struct work_struct *work) | |
496 | { | |
497 | struct max14577_muic_info *info = container_of(work, | |
498 | struct max14577_muic_info, irq_work); | |
499 | int ret = 0; | |
500 | ||
501 | if (!info->edev) | |
502 | return; | |
503 | ||
504 | mutex_lock(&info->mutex); | |
505 | ||
506 | ret = max14577_bulk_read(info->max14577->regmap, | |
507 | MAX14577_MUIC_REG_STATUS1, info->status, 2); | |
508 | if (ret) { | |
509 | dev_err(info->dev, "failed to read MUIC register\n"); | |
510 | mutex_unlock(&info->mutex); | |
511 | return; | |
512 | } | |
513 | ||
514 | if (info->irq_adc) { | |
515 | ret = max14577_muic_adc_handler(info); | |
516 | info->irq_adc = false; | |
517 | } | |
518 | if (info->irq_chg) { | |
519 | ret = max14577_muic_chg_handler(info); | |
520 | info->irq_chg = false; | |
521 | } | |
522 | ||
523 | if (ret < 0) | |
524 | dev_err(info->dev, "failed to handle MUIC interrupt\n"); | |
525 | ||
526 | mutex_unlock(&info->mutex); | |
527 | ||
528 | return; | |
529 | } | |
530 | ||
531 | static irqreturn_t max14577_muic_irq_handler(int irq, void *data) | |
532 | { | |
533 | struct max14577_muic_info *info = data; | |
534 | int i, irq_type = -1; | |
535 | ||
536 | /* | |
537 | * We may be called multiple times for different nested IRQ-s. | |
538 | * Including changes in INT1_ADC and INT2_CGHTYP at once. | |
539 | * However we only need to know whether it was ADC, charger | |
540 | * or both interrupts so decode IRQ and turn on proper flags. | |
541 | */ | |
542 | for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) | |
543 | if (irq == muic_irqs[i].virq) | |
544 | irq_type = muic_irqs[i].irq; | |
545 | ||
546 | switch (irq_type) { | |
547 | case MAX14577_IRQ_INT1_ADC: | |
548 | case MAX14577_IRQ_INT1_ADCLOW: | |
549 | case MAX14577_IRQ_INT1_ADCERR: | |
550 | /* Handle all of accessory except for | |
551 | type of charger accessory */ | |
552 | info->irq_adc = true; | |
553 | break; | |
554 | case MAX14577_IRQ_INT2_CHGTYP: | |
555 | case MAX14577_IRQ_INT2_CHGDETRUN: | |
556 | case MAX14577_IRQ_INT2_DCDTMR: | |
557 | case MAX14577_IRQ_INT2_DBCHG: | |
558 | case MAX14577_IRQ_INT2_VBVOLT: | |
559 | /* Handle charger accessory */ | |
560 | info->irq_chg = true; | |
561 | break; | |
562 | default: | |
563 | dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n", | |
564 | irq_type); | |
565 | return IRQ_HANDLED; | |
566 | } | |
567 | schedule_work(&info->irq_work); | |
568 | ||
569 | return IRQ_HANDLED; | |
570 | } | |
571 | ||
572 | static int max14577_muic_detect_accessory(struct max14577_muic_info *info) | |
573 | { | |
574 | int ret = 0; | |
575 | int adc; | |
576 | int chg_type; | |
577 | bool attached; | |
578 | ||
579 | mutex_lock(&info->mutex); | |
580 | ||
581 | /* Read STATUSx register to detect accessory */ | |
582 | ret = max14577_bulk_read(info->max14577->regmap, | |
583 | MAX14577_MUIC_REG_STATUS1, info->status, 2); | |
584 | if (ret) { | |
585 | dev_err(info->dev, "failed to read MUIC register\n"); | |
586 | mutex_unlock(&info->mutex); | |
587 | return ret; | |
588 | } | |
589 | ||
590 | adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC, | |
591 | &attached); | |
592 | if (attached && adc != MAX14577_MUIC_ADC_OPEN) { | |
593 | ret = max14577_muic_adc_handler(info); | |
594 | if (ret < 0) { | |
595 | dev_err(info->dev, "Cannot detect accessory\n"); | |
596 | mutex_unlock(&info->mutex); | |
597 | return ret; | |
598 | } | |
599 | } | |
600 | ||
601 | chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG, | |
602 | &attached); | |
603 | if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) { | |
604 | ret = max14577_muic_chg_handler(info); | |
605 | if (ret < 0) { | |
606 | dev_err(info->dev, "Cannot detect charger accessory\n"); | |
607 | mutex_unlock(&info->mutex); | |
608 | return ret; | |
609 | } | |
610 | } | |
611 | ||
612 | mutex_unlock(&info->mutex); | |
613 | ||
614 | return 0; | |
615 | } | |
616 | ||
617 | static void max14577_muic_detect_cable_wq(struct work_struct *work) | |
618 | { | |
619 | struct max14577_muic_info *info = container_of(to_delayed_work(work), | |
620 | struct max14577_muic_info, wq_detcable); | |
621 | ||
622 | max14577_muic_detect_accessory(info); | |
623 | } | |
624 | ||
625 | static int max14577_muic_probe(struct platform_device *pdev) | |
626 | { | |
627 | struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); | |
628 | struct max14577_muic_info *info; | |
629 | int delay_jiffies; | |
630 | int ret; | |
631 | int i; | |
632 | u8 id; | |
633 | ||
634 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
635 | if (!info) { | |
636 | dev_err(&pdev->dev, "failed to allocate memory\n"); | |
637 | return -ENOMEM; | |
638 | } | |
639 | info->dev = &pdev->dev; | |
640 | info->max14577 = max14577; | |
641 | ||
642 | platform_set_drvdata(pdev, info); | |
643 | mutex_init(&info->mutex); | |
644 | ||
645 | INIT_WORK(&info->irq_work, max14577_muic_irq_work); | |
646 | ||
647 | /* Support irq domain for max14577 MUIC device */ | |
648 | for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) { | |
649 | struct max14577_muic_irq *muic_irq = &muic_irqs[i]; | |
650 | unsigned int virq = 0; | |
651 | ||
652 | virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq); | |
653 | if (!virq) | |
654 | return -EINVAL; | |
655 | muic_irq->virq = virq; | |
656 | ||
657 | ret = devm_request_threaded_irq(&pdev->dev, virq, NULL, | |
658 | max14577_muic_irq_handler, | |
659 | IRQF_NO_SUSPEND, | |
660 | muic_irq->name, info); | |
661 | if (ret) { | |
662 | dev_err(&pdev->dev, | |
663 | "failed: irq request (IRQ: %d," | |
664 | " error :%d)\n", | |
665 | muic_irq->irq, ret); | |
666 | return ret; | |
667 | } | |
668 | } | |
669 | ||
670 | /* Initialize extcon device */ | |
671 | info->edev = devm_kzalloc(&pdev->dev, sizeof(*info->edev), GFP_KERNEL); | |
672 | if (!info->edev) { | |
673 | dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); | |
674 | return -ENOMEM; | |
675 | } | |
676 | info->edev->name = DEV_NAME; | |
677 | info->edev->supported_cable = max14577_extcon_cable; | |
678 | ret = extcon_dev_register(info->edev); | |
679 | if (ret) { | |
680 | dev_err(&pdev->dev, "failed to register extcon device\n"); | |
681 | return ret; | |
682 | } | |
683 | ||
684 | /* Default h/w line path */ | |
685 | info->path_usb = CTRL1_SW_USB; | |
686 | info->path_uart = CTRL1_SW_UART; | |
687 | delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); | |
688 | ||
689 | /* Set initial path for UART */ | |
690 | max14577_muic_set_path(info, info->path_uart, true); | |
691 | ||
692 | /* Check revision number of MUIC device*/ | |
693 | ret = max14577_read_reg(info->max14577->regmap, | |
694 | MAX14577_REG_DEVICEID, &id); | |
695 | if (ret < 0) { | |
696 | dev_err(&pdev->dev, "failed to read revision number\n"); | |
697 | goto err_extcon; | |
698 | } | |
699 | dev_info(info->dev, "device ID : 0x%x\n", id); | |
700 | ||
701 | /* Set ADC debounce time */ | |
702 | max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS); | |
703 | ||
704 | /* | |
705 | * Detect accessory after completing the initialization of platform | |
706 | * | |
707 | * - Use delayed workqueue to detect cable state and then | |
708 | * notify cable state to notifiee/platform through uevent. | |
709 | * After completing the booting of platform, the extcon provider | |
710 | * driver should notify cable state to upper layer. | |
711 | */ | |
712 | INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq); | |
713 | ret = queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, | |
714 | delay_jiffies); | |
715 | if (ret < 0) { | |
716 | dev_err(&pdev->dev, | |
717 | "failed to schedule delayed work for cable detect\n"); | |
718 | goto err_extcon; | |
719 | } | |
720 | ||
721 | return ret; | |
722 | ||
723 | err_extcon: | |
724 | extcon_dev_unregister(info->edev); | |
725 | return ret; | |
726 | } | |
727 | ||
728 | static int max14577_muic_remove(struct platform_device *pdev) | |
729 | { | |
730 | struct max14577_muic_info *info = platform_get_drvdata(pdev); | |
731 | ||
732 | cancel_work_sync(&info->irq_work); | |
733 | extcon_dev_unregister(info->edev); | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
738 | static struct platform_driver max14577_muic_driver = { | |
739 | .driver = { | |
740 | .name = DEV_NAME, | |
741 | .owner = THIS_MODULE, | |
742 | }, | |
743 | .probe = max14577_muic_probe, | |
744 | .remove = max14577_muic_remove, | |
745 | }; | |
746 | ||
747 | module_platform_driver(max14577_muic_driver); | |
748 | ||
749 | MODULE_DESCRIPTION("MAXIM 14577 Extcon driver"); | |
750 | MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); | |
751 | MODULE_LICENSE("GPL"); | |
752 | MODULE_ALIAS("platform:extcon-max14577"); |