1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Motorola CPCAP PMIC battery charger driver
4 *
5 * Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
6 *
7 * Rewritten for Linux power framework with some parts based on
8 * on earlier driver found in the Motorola Linux kernel:
9 *
10 * Copyright (C) 2009-2010 Motorola, Inc.
11 */
12
13 #include <linux/atomic.h>
14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/slab.h>
17 #include <linux/err.h>
18 #include <linux/interrupt.h>
19 #include <linux/notifier.h>
20 #include <linux/of.h>
21 #include <linux/of_platform.h>
22 #include <linux/platform_device.h>
23 #include <linux/power_supply.h>
24 #include <linux/regmap.h>
25
26 #include <linux/gpio/consumer.h>
27 #include <linux/usb/phy_companion.h>
28 #include <linux/phy/omap_usb.h>
29 #include <linux/usb/otg.h>
30 #include <linux/iio/consumer.h>
31 #include <linux/mfd/motorola-cpcap.h>
32
33 /*
34 * CPCAP_REG_CRM register bits. For documentation of somewhat similar hardware,
35 * see NXP "MC13783 Power Management and Audio Circuit Users's Guide"
36 * MC13783UG.pdf chapter "8.5 Battery Interface Register Summary". The registers
37 * and values for CPCAP are different, but some of the internal components seem
38 * similar. Also see the Motorola Linux kernel cpcap-regbits.h. CPCAP_REG_CHRGR_1
39 * bits that seem to describe the CRM register.
40 */
41 #define CPCAP_REG_CRM_UNUSED_641_15 BIT(15) /* 641 = register number */
42 #define CPCAP_REG_CRM_UNUSED_641_14 BIT(14) /* 641 = register number */
43 #define CPCAP_REG_CRM_CHRG_LED_EN BIT(13) /* Charger LED */
44 #define CPCAP_REG_CRM_RVRSMODE BIT(12) /* USB VBUS output enable */
45 #define CPCAP_REG_CRM_ICHRG_TR1 BIT(11) /* Trickle charge current */
46 #define CPCAP_REG_CRM_ICHRG_TR0 BIT(10)
47 #define CPCAP_REG_CRM_FET_OVRD BIT(9) /* 0 = hardware, 1 = FET_CTRL */
48 #define CPCAP_REG_CRM_FET_CTRL BIT(8) /* BPFET 1 if FET_OVRD set */
49 #define CPCAP_REG_CRM_VCHRG3 BIT(7) /* Charge voltage bits */
50 #define CPCAP_REG_CRM_VCHRG2 BIT(6)
51 #define CPCAP_REG_CRM_VCHRG1 BIT(5)
52 #define CPCAP_REG_CRM_VCHRG0 BIT(4)
53 #define CPCAP_REG_CRM_ICHRG3 BIT(3) /* Charge current bits */
54 #define CPCAP_REG_CRM_ICHRG2 BIT(2)
55 #define CPCAP_REG_CRM_ICHRG1 BIT(1)
56 #define CPCAP_REG_CRM_ICHRG0 BIT(0)
57
58 /* CPCAP_REG_CRM trickle charge voltages */
59 #define CPCAP_REG_CRM_TR(val) (((val) & 0x3) << 10)
60 #define CPCAP_REG_CRM_TR_0A00 CPCAP_REG_CRM_TR(0x0)
61 #define CPCAP_REG_CRM_TR_0A24 CPCAP_REG_CRM_TR(0x1)
62 #define CPCAP_REG_CRM_TR_0A48 CPCAP_REG_CRM_TR(0x2)
63 #define CPCAP_REG_CRM_TR_0A72 CPCAP_REG_CRM_TR(0x4)
64
65 /*
66 * CPCAP_REG_CRM charge voltages based on the ADC channel 1 values.
67 * Note that these register bits don't match MC13783UG.pdf VCHRG
68 * register bits.
69 */
70 #define CPCAP_REG_CRM_VCHRG(val) (((val) & 0xf) << 4)
71 #define CPCAP_REG_CRM_VCHRG_3V80 CPCAP_REG_CRM_VCHRG(0x0)
72 #define CPCAP_REG_CRM_VCHRG_4V10 CPCAP_REG_CRM_VCHRG(0x1)
73 #define CPCAP_REG_CRM_VCHRG_4V12 CPCAP_REG_CRM_VCHRG(0x2)
74 #define CPCAP_REG_CRM_VCHRG_4V15 CPCAP_REG_CRM_VCHRG(0x3)
75 #define CPCAP_REG_CRM_VCHRG_4V17 CPCAP_REG_CRM_VCHRG(0x4)
76 #define CPCAP_REG_CRM_VCHRG_4V20 CPCAP_REG_CRM_VCHRG(0x5)
77 #define CPCAP_REG_CRM_VCHRG_4V23 CPCAP_REG_CRM_VCHRG(0x6)
78 #define CPCAP_REG_CRM_VCHRG_4V25 CPCAP_REG_CRM_VCHRG(0x7)
79 #define CPCAP_REG_CRM_VCHRG_4V27 CPCAP_REG_CRM_VCHRG(0x8)
80 #define CPCAP_REG_CRM_VCHRG_4V30 CPCAP_REG_CRM_VCHRG(0x9)
81 #define CPCAP_REG_CRM_VCHRG_4V33 CPCAP_REG_CRM_VCHRG(0xa)
82 #define CPCAP_REG_CRM_VCHRG_4V35 CPCAP_REG_CRM_VCHRG(0xb)
83 #define CPCAP_REG_CRM_VCHRG_4V38 CPCAP_REG_CRM_VCHRG(0xc)
84 #define CPCAP_REG_CRM_VCHRG_4V40 CPCAP_REG_CRM_VCHRG(0xd)
85 #define CPCAP_REG_CRM_VCHRG_4V42 CPCAP_REG_CRM_VCHRG(0xe)
86 #define CPCAP_REG_CRM_VCHRG_4V44 CPCAP_REG_CRM_VCHRG(0xf)
87
88 /*
89 * CPCAP_REG_CRM charge currents. These seem to match MC13783UG.pdf
90 * values in "Table 8-3. Charge Path Regulator Current Limit
91 * Characteristics" for the nominal values.
92 */
93 #define CPCAP_REG_CRM_ICHRG(val) (((val) & 0xf) << 0)
94 #define CPCAP_REG_CRM_ICHRG_0A000 CPCAP_REG_CRM_ICHRG(0x0)
95 #define CPCAP_REG_CRM_ICHRG_0A070 CPCAP_REG_CRM_ICHRG(0x1)
96 #define CPCAP_REG_CRM_ICHRG_0A177 CPCAP_REG_CRM_ICHRG(0x2)
97 #define CPCAP_REG_CRM_ICHRG_0A266 CPCAP_REG_CRM_ICHRG(0x3)
98 #define CPCAP_REG_CRM_ICHRG_0A355 CPCAP_REG_CRM_ICHRG(0x4)
99 #define CPCAP_REG_CRM_ICHRG_0A443 CPCAP_REG_CRM_ICHRG(0x5)
100 #define CPCAP_REG_CRM_ICHRG_0A532 CPCAP_REG_CRM_ICHRG(0x6)
101 #define CPCAP_REG_CRM_ICHRG_0A621 CPCAP_REG_CRM_ICHRG(0x7)
102 #define CPCAP_REG_CRM_ICHRG_0A709 CPCAP_REG_CRM_ICHRG(0x8)
103 #define CPCAP_REG_CRM_ICHRG_0A798 CPCAP_REG_CRM_ICHRG(0x9)
104 #define CPCAP_REG_CRM_ICHRG_0A886 CPCAP_REG_CRM_ICHRG(0xa)
105 #define CPCAP_REG_CRM_ICHRG_0A975 CPCAP_REG_CRM_ICHRG(0xb)
106 #define CPCAP_REG_CRM_ICHRG_1A064 CPCAP_REG_CRM_ICHRG(0xc)
107 #define CPCAP_REG_CRM_ICHRG_1A152 CPCAP_REG_CRM_ICHRG(0xd)
108 #define CPCAP_REG_CRM_ICHRG_1A596 CPCAP_REG_CRM_ICHRG(0xe)
109 #define CPCAP_REG_CRM_ICHRG_NO_LIMIT CPCAP_REG_CRM_ICHRG(0xf)
110
111 /* CPCAP_REG_VUSBC register bits needed for VBUS */
112 #define CPCAP_BIT_VBUS_SWITCH BIT(0) /* VBUS boost to 5V */
113
114 enum {
115 CPCAP_CHARGER_IIO_BATTDET,
116 CPCAP_CHARGER_IIO_VOLTAGE,
117 CPCAP_CHARGER_IIO_VBUS,
118 CPCAP_CHARGER_IIO_CHRG_CURRENT,
119 CPCAP_CHARGER_IIO_BATT_CURRENT,
120 CPCAP_CHARGER_IIO_NR,
121 };
122
123 enum {
124 CPCAP_CHARGER_DISCONNECTED,
125 CPCAP_CHARGER_DETECTING,
126 CPCAP_CHARGER_CHARGING,
127 CPCAP_CHARGER_DONE,
128 };
129
130 struct cpcap_charger_ddata {
131 struct device *dev;
132 struct regmap *reg;
133 struct list_head irq_list;
134 struct delayed_work detect_work;
135 struct delayed_work vbus_work;
136 struct gpio_desc *gpio[2]; /* gpio_reven0 & 1 */
137
138 struct iio_channel *channels[CPCAP_CHARGER_IIO_NR];
139
140 struct power_supply *usb;
141
142 struct phy_companion comparator; /* For USB VBUS */
143 unsigned int vbus_enabled:1;
144 unsigned int feeding_vbus:1;
145 atomic_t active;
146
147 int status;
148 int state;
149 int voltage;
150 };
151
152 struct cpcap_interrupt_desc {
153 int irq;
154 struct list_head node;
155 const char *name;
156 };
157
158 struct cpcap_charger_ints_state {
159 bool chrg_det;
160 bool rvrs_chrg;
161 bool vbusov;
162
163 bool chrg_se1b;
164 bool rvrs_mode;
165 bool chrgcurr2;
166 bool chrgcurr1;
167 bool vbusvld;
168
169 bool battdetb;
170 };
171
172 static enum power_supply_property cpcap_charger_props[] = {
173 POWER_SUPPLY_PROP_STATUS,
174 POWER_SUPPLY_PROP_ONLINE,
175 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
176 POWER_SUPPLY_PROP_VOLTAGE_NOW,
177 POWER_SUPPLY_PROP_CURRENT_NOW,
178 };
179
180 /* No battery always shows temperature of -40000 */
cpcap_charger_battery_found(struct cpcap_charger_ddata * ddata)181 static bool cpcap_charger_battery_found(struct cpcap_charger_ddata *ddata)
182 {
183 struct iio_channel *channel;
184 int error, temperature;
185
186 channel = ddata->channels[CPCAP_CHARGER_IIO_BATTDET];
187 error = iio_read_channel_processed(channel, &temperature);
188 if (error < 0) {
189 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
190
191 return false;
192 }
193
194 return temperature > -20000 && temperature < 60000;
195 }
196
cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata * ddata)197 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
198 {
199 struct iio_channel *channel;
200 int error, value = 0;
201
202 channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
203 error = iio_read_channel_processed(channel, &value);
204 if (error < 0) {
205 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
206
207 return 0;
208 }
209
210 return value;
211 }
212
cpcap_charger_get_charge_current(struct cpcap_charger_ddata * ddata)213 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
214 {
215 struct iio_channel *channel;
216 int error, value = 0;
217
218 channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
219 error = iio_read_channel_processed(channel, &value);
220 if (error < 0) {
221 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
222
223 return 0;
224 }
225
226 return value;
227 }
228
cpcap_charger_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)229 static int cpcap_charger_get_property(struct power_supply *psy,
230 enum power_supply_property psp,
231 union power_supply_propval *val)
232 {
233 struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
234
235 switch (psp) {
236 case POWER_SUPPLY_PROP_STATUS:
237 val->intval = ddata->status;
238 break;
239 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
240 val->intval = ddata->voltage;
241 break;
242 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
243 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
244 val->intval = cpcap_charger_get_charge_voltage(ddata) *
245 1000;
246 else
247 val->intval = 0;
248 break;
249 case POWER_SUPPLY_PROP_CURRENT_NOW:
250 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
251 val->intval = cpcap_charger_get_charge_current(ddata) *
252 1000;
253 else
254 val->intval = 0;
255 break;
256 case POWER_SUPPLY_PROP_ONLINE:
257 val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
258 break;
259 default:
260 return -EINVAL;
261 }
262
263 return 0;
264 }
265
cpcap_charger_match_voltage(int voltage)266 static int cpcap_charger_match_voltage(int voltage)
267 {
268 switch (voltage) {
269 case 0 ... 4100000 - 1: return 3800000;
270 case 4100000 ... 4120000 - 1: return 4100000;
271 case 4120000 ... 4150000 - 1: return 4120000;
272 case 4150000 ... 4170000 - 1: return 4150000;
273 case 4170000 ... 4200000 - 1: return 4170000;
274 case 4200000 ... 4230000 - 1: return 4200000;
275 case 4230000 ... 4250000 - 1: return 4230000;
276 case 4250000 ... 4270000 - 1: return 4250000;
277 case 4270000 ... 4300000 - 1: return 4270000;
278 case 4300000 ... 4330000 - 1: return 4300000;
279 case 4330000 ... 4350000 - 1: return 4330000;
280 case 4350000 ... 4380000 - 1: return 4350000;
281 case 4380000 ... 4400000 - 1: return 4380000;
282 case 4400000 ... 4420000 - 1: return 4400000;
283 case 4420000 ... 4440000 - 1: return 4420000;
284 case 4440000: return 4440000;
285 default: return 0;
286 }
287 }
288
289 static int
cpcap_charger_get_bat_const_charge_voltage(struct cpcap_charger_ddata * ddata)290 cpcap_charger_get_bat_const_charge_voltage(struct cpcap_charger_ddata *ddata)
291 {
292 union power_supply_propval prop;
293 struct power_supply *battery;
294 int voltage = ddata->voltage;
295 int error;
296
297 battery = power_supply_get_by_name("battery");
298 if (battery) {
299 error = power_supply_get_property(battery,
300 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
301 &prop);
302 if (!error)
303 voltage = prop.intval;
304
305 power_supply_put(battery);
306 }
307
308 return voltage;
309 }
310
cpcap_charger_set_property(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)311 static int cpcap_charger_set_property(struct power_supply *psy,
312 enum power_supply_property psp,
313 const union power_supply_propval *val)
314 {
315 struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
316 int voltage, batvolt;
317
318 switch (psp) {
319 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
320 voltage = cpcap_charger_match_voltage(val->intval);
321 batvolt = cpcap_charger_get_bat_const_charge_voltage(ddata);
322 if (voltage > batvolt)
323 voltage = batvolt;
324 ddata->voltage = voltage;
325 schedule_delayed_work(&ddata->detect_work, 0);
326 break;
327 default:
328 return -EINVAL;
329 }
330
331 return 0;
332 }
333
cpcap_charger_property_is_writeable(struct power_supply * psy,enum power_supply_property psp)334 static int cpcap_charger_property_is_writeable(struct power_supply *psy,
335 enum power_supply_property psp)
336 {
337 switch (psp) {
338 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
339 return 1;
340 default:
341 return 0;
342 }
343 }
344
cpcap_charger_set_cable_path(struct cpcap_charger_ddata * ddata,bool enabled)345 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
346 bool enabled)
347 {
348 if (!ddata->gpio[0])
349 return;
350
351 gpiod_set_value(ddata->gpio[0], enabled);
352 }
353
cpcap_charger_set_inductive_path(struct cpcap_charger_ddata * ddata,bool enabled)354 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
355 bool enabled)
356 {
357 if (!ddata->gpio[1])
358 return;
359
360 gpiod_set_value(ddata->gpio[1], enabled);
361 }
362
cpcap_charger_set_state(struct cpcap_charger_ddata * ddata,int max_voltage,int charge_current,int trickle_current)363 static int cpcap_charger_set_state(struct cpcap_charger_ddata *ddata,
364 int max_voltage, int charge_current,
365 int trickle_current)
366 {
367 bool enable;
368 int error;
369
370 enable = (charge_current || trickle_current);
371 dev_dbg(ddata->dev, "%s enable: %i\n", __func__, enable);
372
373 if (!enable) {
374 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
375 0x3fff,
376 CPCAP_REG_CRM_FET_OVRD |
377 CPCAP_REG_CRM_FET_CTRL);
378 if (error) {
379 ddata->status = POWER_SUPPLY_STATUS_UNKNOWN;
380 goto out_err;
381 }
382
383 ddata->status = POWER_SUPPLY_STATUS_DISCHARGING;
384
385 return 0;
386 }
387
388 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
389 CPCAP_REG_CRM_CHRG_LED_EN |
390 trickle_current |
391 CPCAP_REG_CRM_FET_OVRD |
392 CPCAP_REG_CRM_FET_CTRL |
393 max_voltage |
394 charge_current);
395 if (error) {
396 ddata->status = POWER_SUPPLY_STATUS_UNKNOWN;
397 goto out_err;
398 }
399
400 ddata->status = POWER_SUPPLY_STATUS_CHARGING;
401
402 return 0;
403
404 out_err:
405 dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
406
407 return error;
408 }
409
cpcap_charger_vbus_valid(struct cpcap_charger_ddata * ddata)410 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
411 {
412 int error, value = 0;
413 struct iio_channel *channel =
414 ddata->channels[CPCAP_CHARGER_IIO_VBUS];
415
416 error = iio_read_channel_processed(channel, &value);
417 if (error >= 0)
418 return value > 3900 ? true : false;
419
420 dev_err(ddata->dev, "error reading VBUS: %i\n", error);
421
422 return false;
423 }
424
425 /* VBUS control functions for the USB PHY companion */
cpcap_charger_vbus_work(struct work_struct * work)426 static void cpcap_charger_vbus_work(struct work_struct *work)
427 {
428 struct cpcap_charger_ddata *ddata;
429 bool vbus = false;
430 int error;
431
432 ddata = container_of(work, struct cpcap_charger_ddata,
433 vbus_work.work);
434
435 if (ddata->vbus_enabled) {
436 vbus = cpcap_charger_vbus_valid(ddata);
437 if (vbus) {
438 dev_info(ddata->dev, "VBUS already provided\n");
439
440 return;
441 }
442
443 ddata->feeding_vbus = true;
444 cpcap_charger_set_cable_path(ddata, false);
445 cpcap_charger_set_inductive_path(ddata, false);
446
447 error = cpcap_charger_set_state(ddata, 0, 0, 0);
448 if (error)
449 goto out_err;
450
451 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
452 CPCAP_BIT_VBUS_SWITCH,
453 CPCAP_BIT_VBUS_SWITCH);
454 if (error)
455 goto out_err;
456
457 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
458 CPCAP_REG_CRM_RVRSMODE,
459 CPCAP_REG_CRM_RVRSMODE);
460 if (error)
461 goto out_err;
462 } else {
463 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
464 CPCAP_BIT_VBUS_SWITCH, 0);
465 if (error)
466 goto out_err;
467
468 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
469 CPCAP_REG_CRM_RVRSMODE, 0);
470 if (error)
471 goto out_err;
472
473 cpcap_charger_set_cable_path(ddata, true);
474 cpcap_charger_set_inductive_path(ddata, true);
475 ddata->feeding_vbus = false;
476 }
477
478 return;
479
480 out_err:
481 dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
482 ddata->vbus_enabled ? "enable" : "disable", error);
483 }
484
cpcap_charger_set_vbus(struct phy_companion * comparator,bool enabled)485 static int cpcap_charger_set_vbus(struct phy_companion *comparator,
486 bool enabled)
487 {
488 struct cpcap_charger_ddata *ddata =
489 container_of(comparator, struct cpcap_charger_ddata,
490 comparator);
491
492 ddata->vbus_enabled = enabled;
493 schedule_delayed_work(&ddata->vbus_work, 0);
494
495 return 0;
496 }
497
498 /* Charger interrupt handling functions */
499
cpcap_charger_get_ints_state(struct cpcap_charger_ddata * ddata,struct cpcap_charger_ints_state * s)500 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
501 struct cpcap_charger_ints_state *s)
502 {
503 int val, error;
504
505 error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
506 if (error)
507 return error;
508
509 s->chrg_det = val & BIT(13);
510 s->rvrs_chrg = val & BIT(12);
511 s->vbusov = val & BIT(11);
512
513 error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
514 if (error)
515 return error;
516
517 s->chrg_se1b = val & BIT(13);
518 s->rvrs_mode = val & BIT(6);
519 s->chrgcurr2 = val & BIT(5);
520 s->chrgcurr1 = val & BIT(4);
521 s->vbusvld = val & BIT(3);
522
523 error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
524 if (error)
525 return error;
526
527 s->battdetb = val & BIT(6);
528
529 return 0;
530 }
531
cpcap_charger_update_state(struct cpcap_charger_ddata * ddata,int state)532 static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata,
533 int state)
534 {
535 const char *status;
536
537 if (state > CPCAP_CHARGER_DONE) {
538 dev_warn(ddata->dev, "unknown state: %i\n", state);
539
540 return;
541 }
542
543 ddata->state = state;
544
545 switch (state) {
546 case CPCAP_CHARGER_DISCONNECTED:
547 status = "DISCONNECTED";
548 break;
549 case CPCAP_CHARGER_DETECTING:
550 status = "DETECTING";
551 break;
552 case CPCAP_CHARGER_CHARGING:
553 status = "CHARGING";
554 break;
555 case CPCAP_CHARGER_DONE:
556 status = "DONE";
557 break;
558 default:
559 return;
560 }
561
562 dev_dbg(ddata->dev, "state: %s\n", status);
563 }
564
cpcap_charger_voltage_to_regval(int voltage)565 static int cpcap_charger_voltage_to_regval(int voltage)
566 {
567 int offset;
568
569 switch (voltage) {
570 case 0 ... 4100000 - 1:
571 return 0;
572 case 4100000 ... 4200000 - 1:
573 offset = 1;
574 break;
575 case 4200000 ... 4300000 - 1:
576 offset = 0;
577 break;
578 case 4300000 ... 4380000 - 1:
579 offset = -1;
580 break;
581 case 4380000 ... 4440000:
582 offset = -2;
583 break;
584 default:
585 return 0;
586 }
587
588 return ((voltage - 4100000) / 20000) + offset;
589 }
590
cpcap_charger_disconnect(struct cpcap_charger_ddata * ddata,int state,unsigned long delay)591 static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata,
592 int state, unsigned long delay)
593 {
594 int error;
595
596 error = cpcap_charger_set_state(ddata, 0, 0, 0);
597 if (error)
598 return;
599
600 cpcap_charger_update_state(ddata, state);
601 power_supply_changed(ddata->usb);
602 schedule_delayed_work(&ddata->detect_work, delay);
603 }
604
cpcap_usb_detect(struct work_struct * work)605 static void cpcap_usb_detect(struct work_struct *work)
606 {
607 struct cpcap_charger_ddata *ddata;
608 struct cpcap_charger_ints_state s;
609 int error;
610
611 ddata = container_of(work, struct cpcap_charger_ddata,
612 detect_work.work);
613
614 error = cpcap_charger_get_ints_state(ddata, &s);
615 if (error)
616 return;
617
618 /* Just init the state if a charger is connected with no chrg_det set */
619 if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) {
620 cpcap_charger_update_state(ddata, CPCAP_CHARGER_DETECTING);
621
622 return;
623 }
624
625 /*
626 * If battery voltage is higher than charge voltage, it may have been
627 * charged to 4.35V by Android. Try again in 10 minutes.
628 */
629 if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) {
630 cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DETECTING,
631 HZ * 60 * 10);
632
633 return;
634 }
635
636 /* Delay for 80ms to avoid vbus bouncing when usb cable is plugged in */
637 usleep_range(80000, 120000);
638
639 /* Throttle chrgcurr2 interrupt for charger done and retry */
640 switch (ddata->state) {
641 case CPCAP_CHARGER_CHARGING:
642 if (s.chrgcurr2)
643 break;
644 if (s.chrgcurr1 && s.vbusvld) {
645 cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DONE,
646 HZ * 5);
647 return;
648 }
649 break;
650 case CPCAP_CHARGER_DONE:
651 if (!s.chrgcurr2)
652 break;
653 cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DETECTING,
654 HZ * 5);
655 return;
656 default:
657 break;
658 }
659
660 if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) &&
661 s.chrgcurr1) {
662 int max_current;
663 int vchrg;
664
665 if (cpcap_charger_battery_found(ddata))
666 max_current = CPCAP_REG_CRM_ICHRG_1A596;
667 else
668 max_current = CPCAP_REG_CRM_ICHRG_0A532;
669
670 vchrg = cpcap_charger_voltage_to_regval(ddata->voltage);
671 error = cpcap_charger_set_state(ddata,
672 CPCAP_REG_CRM_VCHRG(vchrg),
673 max_current, 0);
674 if (error)
675 goto out_err;
676 cpcap_charger_update_state(ddata, CPCAP_CHARGER_CHARGING);
677 } else {
678 error = cpcap_charger_set_state(ddata, 0, 0, 0);
679 if (error)
680 goto out_err;
681 cpcap_charger_update_state(ddata, CPCAP_CHARGER_DISCONNECTED);
682 }
683
684 power_supply_changed(ddata->usb);
685 return;
686
687 out_err:
688 dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
689 }
690
cpcap_charger_irq_thread(int irq,void * data)691 static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
692 {
693 struct cpcap_charger_ddata *ddata = data;
694
695 if (!atomic_read(&ddata->active))
696 return IRQ_NONE;
697
698 schedule_delayed_work(&ddata->detect_work, 0);
699
700 return IRQ_HANDLED;
701 }
702
cpcap_usb_init_irq(struct platform_device * pdev,struct cpcap_charger_ddata * ddata,const char * name)703 static int cpcap_usb_init_irq(struct platform_device *pdev,
704 struct cpcap_charger_ddata *ddata,
705 const char *name)
706 {
707 struct cpcap_interrupt_desc *d;
708 int irq, error;
709
710 irq = platform_get_irq_byname(pdev, name);
711 if (irq < 0)
712 return -ENODEV;
713
714 error = devm_request_threaded_irq(ddata->dev, irq, NULL,
715 cpcap_charger_irq_thread,
716 IRQF_SHARED | IRQF_ONESHOT,
717 name, ddata);
718 if (error) {
719 dev_err(ddata->dev, "could not get irq %s: %i\n",
720 name, error);
721
722 return error;
723 }
724
725 d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
726 if (!d)
727 return -ENOMEM;
728
729 d->name = name;
730 d->irq = irq;
731 list_add(&d->node, &ddata->irq_list);
732
733 return 0;
734 }
735
736 static const char * const cpcap_charger_irqs[] = {
737 /* REG_INT_0 */
738 "chrg_det", "rvrs_chrg",
739
740 /* REG_INT1 */
741 "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld",
742
743 /* REG_INT_3 */
744 "battdetb",
745 };
746
cpcap_usb_init_interrupts(struct platform_device * pdev,struct cpcap_charger_ddata * ddata)747 static int cpcap_usb_init_interrupts(struct platform_device *pdev,
748 struct cpcap_charger_ddata *ddata)
749 {
750 int i, error;
751
752 for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
753 error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
754 if (error)
755 return error;
756 }
757
758 return 0;
759 }
760
cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata * ddata)761 static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
762 {
763 int i;
764
765 for (i = 0; i < 2; i++) {
766 ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
767 i, GPIOD_OUT_HIGH);
768 if (IS_ERR(ddata->gpio[i])) {
769 dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
770 i, PTR_ERR(ddata->gpio[i]));
771 ddata->gpio[i] = NULL;
772 }
773 }
774 }
775
cpcap_charger_init_iio(struct cpcap_charger_ddata * ddata)776 static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
777 {
778 const char * const names[CPCAP_CHARGER_IIO_NR] = {
779 "battdetb", "battp", "vbus", "chg_isense", "batti",
780 };
781 int error, i;
782
783 for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
784 ddata->channels[i] = devm_iio_channel_get(ddata->dev,
785 names[i]);
786 if (IS_ERR(ddata->channels[i])) {
787 error = PTR_ERR(ddata->channels[i]);
788 goto out_err;
789 }
790
791 if (!ddata->channels[i]->indio_dev) {
792 error = -ENXIO;
793 goto out_err;
794 }
795 }
796
797 return 0;
798
799 out_err:
800 if (error != -EPROBE_DEFER)
801 dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
802 error);
803
804 return error;
805 }
806
807 static const struct power_supply_desc cpcap_charger_usb_desc = {
808 .name = "usb",
809 .type = POWER_SUPPLY_TYPE_USB,
810 .properties = cpcap_charger_props,
811 .num_properties = ARRAY_SIZE(cpcap_charger_props),
812 .get_property = cpcap_charger_get_property,
813 .set_property = cpcap_charger_set_property,
814 .property_is_writeable = cpcap_charger_property_is_writeable,
815 };
816
817 #ifdef CONFIG_OF
818 static const struct of_device_id cpcap_charger_id_table[] = {
819 {
820 .compatible = "motorola,mapphone-cpcap-charger",
821 },
822 {},
823 };
824 MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
825 #endif
826
cpcap_charger_probe(struct platform_device * pdev)827 static int cpcap_charger_probe(struct platform_device *pdev)
828 {
829 struct cpcap_charger_ddata *ddata;
830 const struct of_device_id *of_id;
831 struct power_supply_config psy_cfg = {};
832 int error;
833
834 of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
835 &pdev->dev);
836 if (!of_id)
837 return -EINVAL;
838
839 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
840 if (!ddata)
841 return -ENOMEM;
842
843 ddata->dev = &pdev->dev;
844 ddata->voltage = 4200000;
845
846 ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
847 if (!ddata->reg)
848 return -ENODEV;
849
850 INIT_LIST_HEAD(&ddata->irq_list);
851 INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
852 INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
853 platform_set_drvdata(pdev, ddata);
854
855 error = cpcap_charger_init_iio(ddata);
856 if (error)
857 return error;
858
859 atomic_set(&ddata->active, 1);
860
861 psy_cfg.of_node = pdev->dev.of_node;
862 psy_cfg.drv_data = ddata;
863
864 ddata->usb = devm_power_supply_register(ddata->dev,
865 &cpcap_charger_usb_desc,
866 &psy_cfg);
867 if (IS_ERR(ddata->usb)) {
868 error = PTR_ERR(ddata->usb);
869 dev_err(ddata->dev, "failed to register USB charger: %i\n",
870 error);
871
872 return error;
873 }
874
875 error = cpcap_usb_init_interrupts(pdev, ddata);
876 if (error)
877 return error;
878
879 ddata->comparator.set_vbus = cpcap_charger_set_vbus;
880 error = omap_usb2_set_comparator(&ddata->comparator);
881 if (error == -ENODEV) {
882 dev_info(ddata->dev, "charger needs phy, deferring probe\n");
883 return -EPROBE_DEFER;
884 }
885
886 cpcap_charger_init_optional_gpios(ddata);
887
888 schedule_delayed_work(&ddata->detect_work, 0);
889
890 return 0;
891 }
892
cpcap_charger_remove(struct platform_device * pdev)893 static int cpcap_charger_remove(struct platform_device *pdev)
894 {
895 struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
896 int error;
897
898 atomic_set(&ddata->active, 0);
899 error = omap_usb2_set_comparator(NULL);
900 if (error)
901 dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
902 error);
903
904 error = cpcap_charger_set_state(ddata, 0, 0, 0);
905 if (error)
906 dev_warn(ddata->dev, "could not clear charger: %i\n",
907 error);
908 cancel_delayed_work_sync(&ddata->vbus_work);
909 cancel_delayed_work_sync(&ddata->detect_work);
910
911 return 0;
912 }
913
914 static struct platform_driver cpcap_charger_driver = {
915 .probe = cpcap_charger_probe,
916 .driver = {
917 .name = "cpcap-charger",
918 .of_match_table = of_match_ptr(cpcap_charger_id_table),
919 },
920 .remove = cpcap_charger_remove,
921 };
922 module_platform_driver(cpcap_charger_driver);
923
924 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
925 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
926 MODULE_LICENSE("GPL v2");
927 MODULE_ALIAS("platform:cpcap-charger");
928