1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * Driver for UCS1002 Programmable USB Port Power Controller |
4 | * |
5 | * Copyright (C) 2019 Zodiac Inflight Innovations |
6 | */ |
7 | #include <linux/bits.h> |
8 | #include <linux/freezer.h> |
9 | #include <linux/gpio/consumer.h> |
10 | #include <linux/i2c.h> |
11 | #include <linux/interrupt.h> |
12 | #include <linux/kernel.h> |
13 | #include <linux/kthread.h> |
14 | #include <linux/device.h> |
15 | #include <linux/module.h> |
16 | #include <linux/of.h> |
17 | #include <linux/of_irq.h> |
18 | #include <linux/power_supply.h> |
19 | #include <linux/regmap.h> |
20 | #include <linux/regulator/driver.h> |
21 | #include <linux/regulator/of_regulator.h> |
22 | |
23 | /* UCS1002 Registers */ |
24 | #define UCS1002_REG_CURRENT_MEASUREMENT 0x00 |
25 | |
26 | /* |
27 | * The Total Accumulated Charge registers store the total accumulated |
28 | * charge delivered from the VS source to a portable device. The total |
29 | * value is calculated using four registers, from 01h to 04h. The bit |
30 | * weighting of the registers is given in mA/hrs. |
31 | */ |
32 | #define UCS1002_REG_TOTAL_ACC_CHARGE 0x01 |
33 | |
34 | /* Other Status Register */ |
35 | #define UCS1002_REG_OTHER_STATUS 0x0f |
36 | # define F_ADET_PIN BIT(4) |
37 | # define F_CHG_ACT BIT(3) |
38 | |
39 | /* Interrupt Status */ |
40 | #define UCS1002_REG_INTERRUPT_STATUS 0x10 |
41 | # define F_ERR BIT(7) |
42 | # define F_DISCHARGE_ERR BIT(6) |
43 | # define F_RESET BIT(5) |
44 | # define F_MIN_KEEP_OUT BIT(4) |
45 | # define F_TSD BIT(3) |
46 | # define F_OVER_VOLT BIT(2) |
47 | # define F_BACK_VOLT BIT(1) |
48 | # define F_OVER_ILIM BIT(0) |
49 | |
50 | /* Pin Status Register */ |
51 | #define UCS1002_REG_PIN_STATUS 0x14 |
52 | # define UCS1002_PWR_STATE_MASK 0x03 |
53 | # define F_PWR_EN_PIN BIT(6) |
54 | # define F_M2_PIN BIT(5) |
55 | # define F_M1_PIN BIT(4) |
56 | # define F_EM_EN_PIN BIT(3) |
57 | # define F_SEL_PIN BIT(2) |
58 | # define F_ACTIVE_MODE_MASK GENMASK(5, 3) |
59 | # define F_ACTIVE_MODE_PASSTHROUGH F_M2_PIN |
60 | # define F_ACTIVE_MODE_DEDICATED F_EM_EN_PIN |
61 | # define F_ACTIVE_MODE_BC12_DCP (F_M2_PIN | F_EM_EN_PIN) |
62 | # define F_ACTIVE_MODE_BC12_SDP F_M1_PIN |
63 | # define F_ACTIVE_MODE_BC12_CDP (F_M1_PIN | F_M2_PIN | F_EM_EN_PIN) |
64 | |
65 | /* General Configuration Register */ |
66 | #define UCS1002_REG_GENERAL_CFG 0x15 |
67 | # define F_RATION_EN BIT(3) |
68 | |
69 | /* Emulation Configuration Register */ |
70 | #define UCS1002_REG_EMU_CFG 0x16 |
71 | |
72 | /* Switch Configuration Register */ |
73 | #define UCS1002_REG_SWITCH_CFG 0x17 |
74 | # define F_PIN_IGNORE BIT(7) |
75 | # define F_EM_EN_SET BIT(5) |
76 | # define F_M2_SET BIT(4) |
77 | # define F_M1_SET BIT(3) |
78 | # define F_S0_SET BIT(2) |
79 | # define F_PWR_EN_SET BIT(1) |
80 | # define F_LATCH_SET BIT(0) |
81 | # define V_SET_ACTIVE_MODE_MASK GENMASK(5, 3) |
82 | # define V_SET_ACTIVE_MODE_PASSTHROUGH F_M2_SET |
83 | # define V_SET_ACTIVE_MODE_DEDICATED F_EM_EN_SET |
84 | # define V_SET_ACTIVE_MODE_BC12_DCP (F_M2_SET | F_EM_EN_SET) |
85 | # define V_SET_ACTIVE_MODE_BC12_SDP F_M1_SET |
86 | # define V_SET_ACTIVE_MODE_BC12_CDP (F_M1_SET | F_M2_SET | F_EM_EN_SET) |
87 | |
88 | /* Current Limit Register */ |
89 | #define UCS1002_REG_ILIMIT 0x19 |
90 | # define UCS1002_ILIM_SW_MASK GENMASK(3, 0) |
91 | |
92 | /* Product ID */ |
93 | #define UCS1002_REG_PRODUCT_ID 0xfd |
94 | # define UCS1002_PRODUCT_ID 0x4e |
95 | |
96 | /* Manufacture name */ |
97 | #define UCS1002_MANUFACTURER "SMSC" |
98 | |
99 | struct ucs1002_info { |
100 | struct power_supply *charger; |
101 | struct i2c_client *client; |
102 | struct regmap *regmap; |
103 | struct regulator_desc *regulator_descriptor; |
104 | struct regulator_dev *rdev; |
105 | bool present; |
106 | bool output_disable; |
107 | struct delayed_work health_poll; |
108 | int health; |
109 | |
110 | }; |
111 | |
112 | static enum power_supply_property ucs1002_props[] = { |
113 | POWER_SUPPLY_PROP_ONLINE, |
114 | POWER_SUPPLY_PROP_CHARGE_NOW, |
115 | POWER_SUPPLY_PROP_CURRENT_NOW, |
116 | POWER_SUPPLY_PROP_CURRENT_MAX, |
117 | POWER_SUPPLY_PROP_PRESENT, /* the presence of PED */ |
118 | POWER_SUPPLY_PROP_MANUFACTURER, |
119 | POWER_SUPPLY_PROP_USB_TYPE, |
120 | POWER_SUPPLY_PROP_HEALTH, |
121 | }; |
122 | |
123 | static int ucs1002_get_online(struct ucs1002_info *info, |
124 | union power_supply_propval *val) |
125 | { |
126 | unsigned int reg; |
127 | int ret; |
128 | |
129 | ret = regmap_read(map: info->regmap, UCS1002_REG_OTHER_STATUS, val: ®); |
130 | if (ret) |
131 | return ret; |
132 | |
133 | val->intval = !!(reg & F_CHG_ACT); |
134 | |
135 | return 0; |
136 | } |
137 | |
138 | static int ucs1002_get_charge(struct ucs1002_info *info, |
139 | union power_supply_propval *val) |
140 | { |
141 | /* |
142 | * To fit within 32 bits some values are rounded (uA/h) |
143 | * |
144 | * For Total Accumulated Charge Middle Low Byte register, addr |
145 | * 03h, byte 2 |
146 | * |
147 | * B0: 0.01084 mA/h rounded to 11 uA/h |
148 | * B1: 0.02169 mA/h rounded to 22 uA/h |
149 | * B2: 0.04340 mA/h rounded to 43 uA/h |
150 | * B3: 0.08676 mA/h rounded to 87 uA/h |
151 | * B4: 0.17350 mA/h rounded to 173 uÁ/h |
152 | * |
153 | * For Total Accumulated Charge Low Byte register, addr 04h, |
154 | * byte 3 |
155 | * |
156 | * B6: 0.00271 mA/h rounded to 3 uA/h |
157 | * B7: 0.005422 mA/h rounded to 5 uA/h |
158 | */ |
159 | static const int bit_weights_uAh[BITS_PER_TYPE(u32)] = { |
160 | /* |
161 | * Bit corresponding to low byte (offset 0x04) |
162 | * B0 B1 B2 B3 B4 B5 B6 B7 |
163 | */ |
164 | 0, 0, 0, 0, 0, 0, 3, 5, |
165 | /* |
166 | * Bit corresponding to middle low byte (offset 0x03) |
167 | * B0 B1 B2 B3 B4 B5 B6 B7 |
168 | */ |
169 | 11, 22, 43, 87, 173, 347, 694, 1388, |
170 | /* |
171 | * Bit corresponding to middle high byte (offset 0x02) |
172 | * B0 B1 B2 B3 B4 B5 B6 B7 |
173 | */ |
174 | 2776, 5552, 11105, 22210, 44420, 88840, 177700, 355400, |
175 | /* |
176 | * Bit corresponding to high byte (offset 0x01) |
177 | * B0 B1 B2 B3 B4 B5 B6 B7 |
178 | */ |
179 | 710700, 1421000, 2843000, 5685000, 11371000, 22742000, |
180 | 45484000, 90968000, |
181 | }; |
182 | unsigned long total_acc_charger; |
183 | unsigned int reg; |
184 | int i, ret; |
185 | |
186 | ret = regmap_bulk_read(map: info->regmap, UCS1002_REG_TOTAL_ACC_CHARGE, |
187 | val: ®, val_count: sizeof(u32)); |
188 | if (ret) |
189 | return ret; |
190 | |
191 | total_acc_charger = be32_to_cpu(reg); /* BE as per offsets above */ |
192 | val->intval = 0; |
193 | |
194 | for_each_set_bit(i, &total_acc_charger, ARRAY_SIZE(bit_weights_uAh)) |
195 | val->intval += bit_weights_uAh[i]; |
196 | |
197 | return 0; |
198 | } |
199 | |
200 | static int ucs1002_get_current(struct ucs1002_info *info, |
201 | union power_supply_propval *val) |
202 | { |
203 | /* |
204 | * The Current Measurement register stores the measured |
205 | * current value delivered to the portable device. The range |
206 | * is from 9.76 mA to 2.5 A. |
207 | */ |
208 | static const int bit_weights_uA[BITS_PER_TYPE(u8)] = { |
209 | 9760, 19500, 39000, 78100, 156200, 312300, 624600, 1249300, |
210 | }; |
211 | unsigned long current_measurement; |
212 | unsigned int reg; |
213 | int i, ret; |
214 | |
215 | ret = regmap_read(map: info->regmap, UCS1002_REG_CURRENT_MEASUREMENT, val: ®); |
216 | if (ret) |
217 | return ret; |
218 | |
219 | current_measurement = reg; |
220 | val->intval = 0; |
221 | |
222 | for_each_set_bit(i, ¤t_measurement, ARRAY_SIZE(bit_weights_uA)) |
223 | val->intval += bit_weights_uA[i]; |
224 | |
225 | return 0; |
226 | } |
227 | |
228 | /* |
229 | * The Current Limit register stores the maximum current used by the |
230 | * port switch. The range is from 500mA to 2.5 A. |
231 | */ |
232 | static const u32 ucs1002_current_limit_uA[] = { |
233 | 500000, 900000, 1000000, 1200000, 1500000, 1800000, 2000000, 2500000, |
234 | }; |
235 | |
236 | static int ucs1002_get_max_current(struct ucs1002_info *info, |
237 | union power_supply_propval *val) |
238 | { |
239 | unsigned int reg; |
240 | int ret; |
241 | |
242 | if (info->output_disable) { |
243 | val->intval = 0; |
244 | return 0; |
245 | } |
246 | |
247 | ret = regmap_read(map: info->regmap, UCS1002_REG_ILIMIT, val: ®); |
248 | if (ret) |
249 | return ret; |
250 | |
251 | val->intval = ucs1002_current_limit_uA[reg & UCS1002_ILIM_SW_MASK]; |
252 | |
253 | return 0; |
254 | } |
255 | |
256 | static int ucs1002_set_max_current(struct ucs1002_info *info, u32 val) |
257 | { |
258 | unsigned int reg; |
259 | int ret, idx; |
260 | |
261 | if (val == 0) { |
262 | info->output_disable = true; |
263 | regulator_disable_regmap(rdev: info->rdev); |
264 | return 0; |
265 | } |
266 | |
267 | for (idx = 0; idx < ARRAY_SIZE(ucs1002_current_limit_uA); idx++) { |
268 | if (val == ucs1002_current_limit_uA[idx]) |
269 | break; |
270 | } |
271 | |
272 | if (idx == ARRAY_SIZE(ucs1002_current_limit_uA)) |
273 | return -EINVAL; |
274 | |
275 | ret = regmap_write(map: info->regmap, UCS1002_REG_ILIMIT, val: idx); |
276 | if (ret) |
277 | return ret; |
278 | /* |
279 | * Any current limit setting exceeding the one set via ILIM |
280 | * pin will be rejected, so we read out freshly changed limit |
281 | * to make sure that it took effect. |
282 | */ |
283 | ret = regmap_read(map: info->regmap, UCS1002_REG_ILIMIT, val: ®); |
284 | if (ret) |
285 | return ret; |
286 | |
287 | if (reg != idx) |
288 | return -EINVAL; |
289 | |
290 | info->output_disable = false; |
291 | |
292 | if (info->rdev && info->rdev->use_count && |
293 | !regulator_is_enabled_regmap(rdev: info->rdev)) |
294 | regulator_enable_regmap(rdev: info->rdev); |
295 | |
296 | return 0; |
297 | } |
298 | |
299 | static enum power_supply_usb_type ucs1002_usb_types[] = { |
300 | POWER_SUPPLY_USB_TYPE_PD, |
301 | POWER_SUPPLY_USB_TYPE_SDP, |
302 | POWER_SUPPLY_USB_TYPE_DCP, |
303 | POWER_SUPPLY_USB_TYPE_CDP, |
304 | POWER_SUPPLY_USB_TYPE_UNKNOWN, |
305 | }; |
306 | |
307 | static int ucs1002_set_usb_type(struct ucs1002_info *info, int val) |
308 | { |
309 | unsigned int mode; |
310 | |
311 | if (val < 0 || val >= ARRAY_SIZE(ucs1002_usb_types)) |
312 | return -EINVAL; |
313 | |
314 | switch (ucs1002_usb_types[val]) { |
315 | case POWER_SUPPLY_USB_TYPE_PD: |
316 | mode = V_SET_ACTIVE_MODE_DEDICATED; |
317 | break; |
318 | case POWER_SUPPLY_USB_TYPE_SDP: |
319 | mode = V_SET_ACTIVE_MODE_BC12_SDP; |
320 | break; |
321 | case POWER_SUPPLY_USB_TYPE_DCP: |
322 | mode = V_SET_ACTIVE_MODE_BC12_DCP; |
323 | break; |
324 | case POWER_SUPPLY_USB_TYPE_CDP: |
325 | mode = V_SET_ACTIVE_MODE_BC12_CDP; |
326 | break; |
327 | default: |
328 | return -EINVAL; |
329 | } |
330 | |
331 | return regmap_update_bits(map: info->regmap, UCS1002_REG_SWITCH_CFG, |
332 | V_SET_ACTIVE_MODE_MASK, val: mode); |
333 | } |
334 | |
335 | static int ucs1002_get_usb_type(struct ucs1002_info *info, |
336 | union power_supply_propval *val) |
337 | { |
338 | enum power_supply_usb_type type; |
339 | unsigned int reg; |
340 | int ret; |
341 | |
342 | ret = regmap_read(map: info->regmap, UCS1002_REG_PIN_STATUS, val: ®); |
343 | if (ret) |
344 | return ret; |
345 | |
346 | switch (reg & F_ACTIVE_MODE_MASK) { |
347 | default: |
348 | type = POWER_SUPPLY_USB_TYPE_UNKNOWN; |
349 | break; |
350 | case F_ACTIVE_MODE_DEDICATED: |
351 | type = POWER_SUPPLY_USB_TYPE_PD; |
352 | break; |
353 | case F_ACTIVE_MODE_BC12_SDP: |
354 | type = POWER_SUPPLY_USB_TYPE_SDP; |
355 | break; |
356 | case F_ACTIVE_MODE_BC12_DCP: |
357 | type = POWER_SUPPLY_USB_TYPE_DCP; |
358 | break; |
359 | case F_ACTIVE_MODE_BC12_CDP: |
360 | type = POWER_SUPPLY_USB_TYPE_CDP; |
361 | break; |
362 | } |
363 | |
364 | val->intval = type; |
365 | |
366 | return 0; |
367 | } |
368 | |
369 | static int ucs1002_get_property(struct power_supply *psy, |
370 | enum power_supply_property psp, |
371 | union power_supply_propval *val) |
372 | { |
373 | struct ucs1002_info *info = power_supply_get_drvdata(psy); |
374 | |
375 | switch (psp) { |
376 | case POWER_SUPPLY_PROP_ONLINE: |
377 | return ucs1002_get_online(info, val); |
378 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
379 | return ucs1002_get_charge(info, val); |
380 | case POWER_SUPPLY_PROP_CURRENT_NOW: |
381 | return ucs1002_get_current(info, val); |
382 | case POWER_SUPPLY_PROP_CURRENT_MAX: |
383 | return ucs1002_get_max_current(info, val); |
384 | case POWER_SUPPLY_PROP_USB_TYPE: |
385 | return ucs1002_get_usb_type(info, val); |
386 | case POWER_SUPPLY_PROP_HEALTH: |
387 | val->intval = info->health; |
388 | return 0; |
389 | case POWER_SUPPLY_PROP_PRESENT: |
390 | val->intval = info->present; |
391 | return 0; |
392 | case POWER_SUPPLY_PROP_MANUFACTURER: |
393 | val->strval = UCS1002_MANUFACTURER; |
394 | return 0; |
395 | default: |
396 | return -EINVAL; |
397 | } |
398 | } |
399 | |
400 | static int ucs1002_set_property(struct power_supply *psy, |
401 | enum power_supply_property psp, |
402 | const union power_supply_propval *val) |
403 | { |
404 | struct ucs1002_info *info = power_supply_get_drvdata(psy); |
405 | |
406 | switch (psp) { |
407 | case POWER_SUPPLY_PROP_CURRENT_MAX: |
408 | return ucs1002_set_max_current(info, val: val->intval); |
409 | case POWER_SUPPLY_PROP_USB_TYPE: |
410 | return ucs1002_set_usb_type(info, val: val->intval); |
411 | default: |
412 | return -EINVAL; |
413 | } |
414 | } |
415 | |
416 | static int ucs1002_property_is_writeable(struct power_supply *psy, |
417 | enum power_supply_property psp) |
418 | { |
419 | switch (psp) { |
420 | case POWER_SUPPLY_PROP_CURRENT_MAX: |
421 | case POWER_SUPPLY_PROP_USB_TYPE: |
422 | return true; |
423 | default: |
424 | return false; |
425 | } |
426 | } |
427 | |
428 | static const struct power_supply_desc ucs1002_charger_desc = { |
429 | .name = "ucs1002" , |
430 | .type = POWER_SUPPLY_TYPE_USB, |
431 | .usb_types = ucs1002_usb_types, |
432 | .num_usb_types = ARRAY_SIZE(ucs1002_usb_types), |
433 | .get_property = ucs1002_get_property, |
434 | .set_property = ucs1002_set_property, |
435 | .property_is_writeable = ucs1002_property_is_writeable, |
436 | .properties = ucs1002_props, |
437 | .num_properties = ARRAY_SIZE(ucs1002_props), |
438 | }; |
439 | |
440 | static void ucs1002_health_poll(struct work_struct *work) |
441 | { |
442 | struct ucs1002_info *info = container_of(work, struct ucs1002_info, |
443 | health_poll.work); |
444 | int ret; |
445 | u32 reg; |
446 | |
447 | ret = regmap_read(map: info->regmap, UCS1002_REG_INTERRUPT_STATUS, val: ®); |
448 | if (ret) |
449 | return; |
450 | |
451 | /* bad health and no status change, just schedule us again in a while */ |
452 | if ((reg & F_ERR) && info->health != POWER_SUPPLY_HEALTH_GOOD) { |
453 | schedule_delayed_work(dwork: &info->health_poll, |
454 | delay: msecs_to_jiffies(m: 2000)); |
455 | return; |
456 | } |
457 | |
458 | if (reg & F_TSD) |
459 | info->health = POWER_SUPPLY_HEALTH_OVERHEAT; |
460 | else if (reg & (F_OVER_VOLT | F_BACK_VOLT)) |
461 | info->health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; |
462 | else if (reg & F_OVER_ILIM) |
463 | info->health = POWER_SUPPLY_HEALTH_OVERCURRENT; |
464 | else if (reg & (F_DISCHARGE_ERR | F_MIN_KEEP_OUT)) |
465 | info->health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; |
466 | else |
467 | info->health = POWER_SUPPLY_HEALTH_GOOD; |
468 | |
469 | sysfs_notify(kobj: &info->charger->dev.kobj, NULL, attr: "health" ); |
470 | } |
471 | |
472 | static irqreturn_t ucs1002_charger_irq(int irq, void *data) |
473 | { |
474 | int ret, regval; |
475 | bool present; |
476 | struct ucs1002_info *info = data; |
477 | |
478 | present = info->present; |
479 | |
480 | ret = regmap_read(map: info->regmap, UCS1002_REG_OTHER_STATUS, val: ®val); |
481 | if (ret) |
482 | return IRQ_HANDLED; |
483 | |
484 | /* update attached status */ |
485 | info->present = regval & F_ADET_PIN; |
486 | |
487 | /* notify the change */ |
488 | if (present != info->present) |
489 | power_supply_changed(psy: info->charger); |
490 | |
491 | return IRQ_HANDLED; |
492 | } |
493 | |
494 | static irqreturn_t ucs1002_alert_irq(int irq, void *data) |
495 | { |
496 | struct ucs1002_info *info = data; |
497 | |
498 | mod_delayed_work(wq: system_wq, dwork: &info->health_poll, delay: 0); |
499 | |
500 | return IRQ_HANDLED; |
501 | } |
502 | |
503 | static int ucs1002_regulator_enable(struct regulator_dev *rdev) |
504 | { |
505 | struct ucs1002_info *info = rdev_get_drvdata(rdev); |
506 | |
507 | /* |
508 | * If the output is disabled due to 0 maximum current, just pretend the |
509 | * enable did work. The regulator will be enabled as soon as we get a |
510 | * a non-zero maximum current budget. |
511 | */ |
512 | if (info->output_disable) |
513 | return 0; |
514 | |
515 | return regulator_enable_regmap(rdev); |
516 | } |
517 | |
518 | static const struct regulator_ops ucs1002_regulator_ops = { |
519 | .is_enabled = regulator_is_enabled_regmap, |
520 | .enable = ucs1002_regulator_enable, |
521 | .disable = regulator_disable_regmap, |
522 | }; |
523 | |
524 | static const struct regulator_desc ucs1002_regulator_descriptor = { |
525 | .name = "ucs1002-vbus" , |
526 | .ops = &ucs1002_regulator_ops, |
527 | .type = REGULATOR_VOLTAGE, |
528 | .owner = THIS_MODULE, |
529 | .enable_reg = UCS1002_REG_SWITCH_CFG, |
530 | .enable_mask = F_PWR_EN_SET, |
531 | .enable_val = F_PWR_EN_SET, |
532 | .fixed_uV = 5000000, |
533 | .n_voltages = 1, |
534 | }; |
535 | |
536 | static int ucs1002_probe(struct i2c_client *client) |
537 | { |
538 | struct device *dev = &client->dev; |
539 | struct power_supply_config charger_config = {}; |
540 | const struct regmap_config regmap_config = { |
541 | .reg_bits = 8, |
542 | .val_bits = 8, |
543 | }; |
544 | struct regulator_config regulator_config = {}; |
545 | int irq_a_det, irq_alert, ret; |
546 | struct ucs1002_info *info; |
547 | unsigned int regval; |
548 | |
549 | info = devm_kzalloc(dev, size: sizeof(*info), GFP_KERNEL); |
550 | if (!info) |
551 | return -ENOMEM; |
552 | |
553 | info->regmap = devm_regmap_init_i2c(client, ®map_config); |
554 | ret = PTR_ERR_OR_ZERO(ptr: info->regmap); |
555 | if (ret) { |
556 | dev_err(dev, "Regmap initialization failed: %d\n" , ret); |
557 | return ret; |
558 | } |
559 | |
560 | info->client = client; |
561 | |
562 | irq_a_det = of_irq_get_byname(dev: dev->of_node, name: "a_det" ); |
563 | irq_alert = of_irq_get_byname(dev: dev->of_node, name: "alert" ); |
564 | |
565 | charger_config.of_node = dev->of_node; |
566 | charger_config.drv_data = info; |
567 | |
568 | ret = regmap_read(map: info->regmap, UCS1002_REG_PRODUCT_ID, val: ®val); |
569 | if (ret) { |
570 | dev_err(dev, "Failed to read product ID: %d\n" , ret); |
571 | return ret; |
572 | } |
573 | |
574 | if (regval != UCS1002_PRODUCT_ID) { |
575 | dev_err(dev, |
576 | "Product ID does not match (0x%02x != 0x%02x)\n" , |
577 | regval, UCS1002_PRODUCT_ID); |
578 | return -ENODEV; |
579 | } |
580 | |
581 | /* Enable charge rationing by default */ |
582 | ret = regmap_update_bits(map: info->regmap, UCS1002_REG_GENERAL_CFG, |
583 | F_RATION_EN, F_RATION_EN); |
584 | if (ret) { |
585 | dev_err(dev, "Failed to read general config: %d\n" , ret); |
586 | return ret; |
587 | } |
588 | |
589 | /* |
590 | * Ignore the M1, M2, PWR_EN, and EM_EN pin states. Set active |
591 | * mode selection to BC1.2 CDP. |
592 | */ |
593 | ret = regmap_update_bits(map: info->regmap, UCS1002_REG_SWITCH_CFG, |
594 | V_SET_ACTIVE_MODE_MASK | F_PIN_IGNORE, |
595 | V_SET_ACTIVE_MODE_BC12_CDP | F_PIN_IGNORE); |
596 | if (ret) { |
597 | dev_err(dev, "Failed to configure default mode: %d\n" , ret); |
598 | return ret; |
599 | } |
600 | /* |
601 | * Be safe and set initial current limit to 500mA |
602 | */ |
603 | ret = ucs1002_set_max_current(info, val: 500000); |
604 | if (ret) { |
605 | dev_err(dev, "Failed to set max current default: %d\n" , ret); |
606 | return ret; |
607 | } |
608 | |
609 | info->charger = devm_power_supply_register(parent: dev, desc: &ucs1002_charger_desc, |
610 | cfg: &charger_config); |
611 | ret = PTR_ERR_OR_ZERO(ptr: info->charger); |
612 | if (ret) { |
613 | dev_err(dev, "Failed to register power supply: %d\n" , ret); |
614 | return ret; |
615 | } |
616 | |
617 | ret = regmap_read(map: info->regmap, UCS1002_REG_PIN_STATUS, val: ®val); |
618 | if (ret) { |
619 | dev_err(dev, "Failed to read pin status: %d\n" , ret); |
620 | return ret; |
621 | } |
622 | |
623 | info->regulator_descriptor = |
624 | devm_kmemdup(dev, src: &ucs1002_regulator_descriptor, |
625 | len: sizeof(ucs1002_regulator_descriptor), |
626 | GFP_KERNEL); |
627 | if (!info->regulator_descriptor) |
628 | return -ENOMEM; |
629 | |
630 | info->regulator_descriptor->enable_is_inverted = !(regval & F_SEL_PIN); |
631 | |
632 | regulator_config.dev = dev; |
633 | regulator_config.of_node = dev->of_node; |
634 | regulator_config.regmap = info->regmap; |
635 | regulator_config.driver_data = info; |
636 | |
637 | info->rdev = devm_regulator_register(dev, regulator_desc: info->regulator_descriptor, |
638 | config: ®ulator_config); |
639 | ret = PTR_ERR_OR_ZERO(ptr: info->rdev); |
640 | if (ret) { |
641 | dev_err(dev, "Failed to register VBUS regulator: %d\n" , ret); |
642 | return ret; |
643 | } |
644 | |
645 | info->health = POWER_SUPPLY_HEALTH_GOOD; |
646 | INIT_DELAYED_WORK(&info->health_poll, ucs1002_health_poll); |
647 | |
648 | if (irq_a_det > 0) { |
649 | ret = devm_request_threaded_irq(dev, irq: irq_a_det, NULL, |
650 | thread_fn: ucs1002_charger_irq, |
651 | IRQF_ONESHOT, |
652 | devname: "ucs1002-a_det" , dev_id: info); |
653 | if (ret) { |
654 | dev_err(dev, "Failed to request A_DET threaded irq: %d\n" , |
655 | ret); |
656 | return ret; |
657 | } |
658 | } |
659 | |
660 | if (irq_alert > 0) { |
661 | ret = devm_request_irq(dev, irq: irq_alert, handler: ucs1002_alert_irq, |
662 | irqflags: 0,devname: "ucs1002-alert" , dev_id: info); |
663 | if (ret) { |
664 | dev_err(dev, "Failed to request ALERT threaded irq: %d\n" , |
665 | ret); |
666 | return ret; |
667 | } |
668 | } |
669 | |
670 | return 0; |
671 | } |
672 | |
673 | static const struct of_device_id ucs1002_of_match[] = { |
674 | { .compatible = "microchip,ucs1002" , }, |
675 | { /* sentinel */ }, |
676 | }; |
677 | MODULE_DEVICE_TABLE(of, ucs1002_of_match); |
678 | |
679 | static struct i2c_driver ucs1002_driver = { |
680 | .driver = { |
681 | .name = "ucs1002" , |
682 | .of_match_table = ucs1002_of_match, |
683 | }, |
684 | .probe = ucs1002_probe, |
685 | }; |
686 | module_i2c_driver(ucs1002_driver); |
687 | |
688 | MODULE_DESCRIPTION("Microchip UCS1002 Programmable USB Port Power Controller" ); |
689 | MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>" ); |
690 | MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>" ); |
691 | MODULE_LICENSE("GPL" ); |
692 | |