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9a2688e4 AS |
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 | |
81196e2e | 41 | # define F_ERR BIT(7) |
9a2688e4 AS |
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; | |
a3d70dac | 104 | struct regulator_dev *rdev; |
9a2688e4 | 105 | bool present; |
a3d70dac | 106 | bool output_disable; |
81196e2e LS |
107 | struct delayed_work health_poll; |
108 | int health; | |
109 | ||
9a2688e4 AS |
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(info->regmap, UCS1002_REG_OTHER_STATUS, ®); | |
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(info->regmap, UCS1002_REG_TOTAL_ACC_CHARGE, | |
187 | ®, 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(info->regmap, UCS1002_REG_CURRENT_MEASUREMENT, ®); | |
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 | ||
a3d70dac LS |
242 | if (info->output_disable) { |
243 | val->intval = 0; | |
244 | return 0; | |
245 | } | |
246 | ||
9a2688e4 AS |
247 | ret = regmap_read(info->regmap, UCS1002_REG_ILIMIT, ®); |
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 | ||
a3d70dac LS |
261 | if (val == 0) { |
262 | info->output_disable = true; | |
263 | regulator_disable_regmap(info->rdev); | |
264 | return 0; | |
265 | } | |
266 | ||
9a2688e4 AS |
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(info->regmap, UCS1002_REG_ILIMIT, 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(info->regmap, UCS1002_REG_ILIMIT, ®); | |
284 | if (ret) | |
285 | return ret; | |
286 | ||
287 | if (reg != idx) | |
288 | return -EINVAL; | |
289 | ||
a3d70dac LS |
290 | info->output_disable = false; |
291 | ||
292 | if (info->rdev && info->rdev->use_count && | |
293 | !regulator_is_enabled_regmap(info->rdev)) | |
294 | regulator_enable_regmap(info->rdev); | |
295 | ||
9a2688e4 AS |
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(info->regmap, UCS1002_REG_SWITCH_CFG, | |
332 | V_SET_ACTIVE_MODE_MASK, 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(info->regmap, UCS1002_REG_PIN_STATUS, ®); | |
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; | |
89e7854f | 362 | } |
9a2688e4 AS |
363 | |
364 | val->intval = type; | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
9a2688e4 AS |
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: | |
e3505994 DC |
387 | val->intval = info->health; |
388 | return 0; | |
9a2688e4 AS |
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->intval); | |
409 | case POWER_SUPPLY_PROP_USB_TYPE: | |
410 | return ucs1002_set_usb_type(info, 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 | ||
81196e2e LS |
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(info->regmap, UCS1002_REG_INTERRUPT_STATUS, ®); | |
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(&info->health_poll, | |
454 | msecs_to_jiffies(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(&info->charger->dev.kobj, NULL, "health"); | |
470 | } | |
471 | ||
9a2688e4 AS |
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(info->regmap, UCS1002_REG_OTHER_STATUS, ®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(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 | ||
81196e2e | 498 | mod_delayed_work(system_wq, &info->health_poll, 0); |
9a2688e4 AS |
499 | |
500 | return IRQ_HANDLED; | |
501 | } | |
502 | ||
577233a3 | 503 | static int ucs1002_regulator_enable(struct regulator_dev *rdev) |
a3d70dac LS |
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 | ||
9a2688e4 AS |
518 | static const struct regulator_ops ucs1002_regulator_ops = { |
519 | .is_enabled = regulator_is_enabled_regmap, | |
a3d70dac | 520 | .enable = ucs1002_regulator_enable, |
9a2688e4 AS |
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 | ||
8a4f891b | 536 | static int ucs1002_probe(struct i2c_client *client) |
9a2688e4 AS |
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; | |
9a2688e4 AS |
546 | struct ucs1002_info *info; |
547 | unsigned int regval; | |
548 | ||
549 | info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); | |
550 | if (!info) | |
551 | return -ENOMEM; | |
552 | ||
553 | info->regmap = devm_regmap_init_i2c(client, ®map_config); | |
09eb8b7c | 554 | ret = PTR_ERR_OR_ZERO(info->regmap); |
9a2688e4 AS |
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->of_node, "a_det"); | |
563 | irq_alert = of_irq_get_byname(dev->of_node, "alert"); | |
564 | ||
565 | charger_config.of_node = dev->of_node; | |
566 | charger_config.drv_data = info; | |
567 | ||
568 | ret = regmap_read(info->regmap, UCS1002_REG_PRODUCT_ID, ®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(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(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, 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(dev, &ucs1002_charger_desc, | |
610 | &charger_config); | |
611 | ret = PTR_ERR_OR_ZERO(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(info->regmap, UCS1002_REG_PIN_STATUS, ®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, &ucs1002_regulator_descriptor, | |
625 | 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; | |
a3d70dac | 635 | regulator_config.driver_data = info; |
9a2688e4 | 636 | |
a3d70dac | 637 | info->rdev = devm_regulator_register(dev, info->regulator_descriptor, |
9a2688e4 | 638 | ®ulator_config); |
a3d70dac | 639 | ret = PTR_ERR_OR_ZERO(info->rdev); |
9a2688e4 AS |
640 | if (ret) { |
641 | dev_err(dev, "Failed to register VBUS regulator: %d\n", ret); | |
642 | return ret; | |
643 | } | |
644 | ||
81196e2e LS |
645 | info->health = POWER_SUPPLY_HEALTH_GOOD; |
646 | INIT_DELAYED_WORK(&info->health_poll, ucs1002_health_poll); | |
647 | ||
9a2688e4 AS |
648 | if (irq_a_det > 0) { |
649 | ret = devm_request_threaded_irq(dev, irq_a_det, NULL, | |
650 | ucs1002_charger_irq, | |
651 | IRQF_ONESHOT, | |
652 | "ucs1002-a_det", 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) { | |
81196e2e LS |
661 | ret = devm_request_irq(dev, irq_alert, ucs1002_alert_irq, |
662 | 0,"ucs1002-alert", info); | |
9a2688e4 AS |
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 | }, | |
fe20b1dc | 684 | .probe = ucs1002_probe, |
9a2688e4 AS |
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"); |