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 * 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/mod_devicetable.h>
21 #include <linux/platform_device.h>
22 #include <linux/power_supply.h>
23 #include <linux/regmap.h>
24
25 #include <linux/gpio/consumer.h>
26 #include <linux/usb/phy_companion.h>
27 #include <linux/phy/omap_usb.h>
28 #include <linux/usb/otg.h>
29 #include <linux/iio/consumer.h>
30 #include <linux/mfd/motorola-cpcap.h>
31
32 /*
33 * CPCAP_REG_CRM register bits. For documentation of somewhat similar hardware,
34 * see NXP "MC13783 Power Management and Audio Circuit Users's Guide"
35 * MC13783UG.pdf chapter "8.5 Battery Interface Register Summary". The registers
36 * and values for CPCAP are different, but some of the internal components seem
37 * similar. Also see the Motorola Linux kernel cpcap-regbits.h. CPCAP_REG_CHRGR_1
38 * bits that seem to describe the CRM register.
39 */
40 #define CPCAP_REG_CRM_UNUSED_641_15 BIT(15) /* 641 = register number */
41 #define CPCAP_REG_CRM_UNUSED_641_14 BIT(14) /* 641 = register number */
42 #define CPCAP_REG_CRM_CHRG_LED_EN BIT(13) /* Charger LED */
43 #define CPCAP_REG_CRM_RVRSMODE BIT(12) /* USB VBUS output enable */
44 #define CPCAP_REG_CRM_ICHRG_TR1 BIT(11) /* Trickle charge current */
45 #define CPCAP_REG_CRM_ICHRG_TR0 BIT(10)
46 #define CPCAP_REG_CRM_FET_OVRD BIT(9) /* 0 = hardware, 1 = FET_CTRL */
47 #define CPCAP_REG_CRM_FET_CTRL BIT(8) /* BPFET 1 if FET_OVRD set */
48 #define CPCAP_REG_CRM_VCHRG3 BIT(7) /* Charge voltage bits */
49 #define CPCAP_REG_CRM_VCHRG2 BIT(6)
50 #define CPCAP_REG_CRM_VCHRG1 BIT(5)
51 #define CPCAP_REG_CRM_VCHRG0 BIT(4)
52 #define CPCAP_REG_CRM_ICHRG3 BIT(3) /* Charge current bits */
53 #define CPCAP_REG_CRM_ICHRG2 BIT(2)
54 #define CPCAP_REG_CRM_ICHRG1 BIT(1)
55 #define CPCAP_REG_CRM_ICHRG0 BIT(0)
56
57 /* CPCAP_REG_CRM trickle charge voltages */
58 #define CPCAP_REG_CRM_TR(val) (((val) & 0x3) << 10)
59 #define CPCAP_REG_CRM_TR_0A00 CPCAP_REG_CRM_TR(0x0)
60 #define CPCAP_REG_CRM_TR_0A24 CPCAP_REG_CRM_TR(0x1)
61 #define CPCAP_REG_CRM_TR_0A48 CPCAP_REG_CRM_TR(0x2)
62 #define CPCAP_REG_CRM_TR_0A72 CPCAP_REG_CRM_TR(0x4)
63
64 /*
65 * CPCAP_REG_CRM charge voltages based on the ADC channel 1 values.
66 * Note that these register bits don't match MC13783UG.pdf VCHRG
67 * register bits.
68 */
69 #define CPCAP_REG_CRM_VCHRG(val) (((val) & 0xf) << 4)
70 #define CPCAP_REG_CRM_VCHRG_3V80 CPCAP_REG_CRM_VCHRG(0x0)
71 #define CPCAP_REG_CRM_VCHRG_4V10 CPCAP_REG_CRM_VCHRG(0x1)
72 #define CPCAP_REG_CRM_VCHRG_4V12 CPCAP_REG_CRM_VCHRG(0x2)
73 #define CPCAP_REG_CRM_VCHRG_4V15 CPCAP_REG_CRM_VCHRG(0x3)
74 #define CPCAP_REG_CRM_VCHRG_4V17 CPCAP_REG_CRM_VCHRG(0x4)
75 #define CPCAP_REG_CRM_VCHRG_4V20 CPCAP_REG_CRM_VCHRG(0x5)
76 #define CPCAP_REG_CRM_VCHRG_4V23 CPCAP_REG_CRM_VCHRG(0x6)
77 #define CPCAP_REG_CRM_VCHRG_4V25 CPCAP_REG_CRM_VCHRG(0x7)
78 #define CPCAP_REG_CRM_VCHRG_4V27 CPCAP_REG_CRM_VCHRG(0x8)
79 #define CPCAP_REG_CRM_VCHRG_4V30 CPCAP_REG_CRM_VCHRG(0x9)
80 #define CPCAP_REG_CRM_VCHRG_4V33 CPCAP_REG_CRM_VCHRG(0xa)
81 #define CPCAP_REG_CRM_VCHRG_4V35 CPCAP_REG_CRM_VCHRG(0xb)
82 #define CPCAP_REG_CRM_VCHRG_4V38 CPCAP_REG_CRM_VCHRG(0xc)
83 #define CPCAP_REG_CRM_VCHRG_4V40 CPCAP_REG_CRM_VCHRG(0xd)
84 #define CPCAP_REG_CRM_VCHRG_4V42 CPCAP_REG_CRM_VCHRG(0xe)
85 #define CPCAP_REG_CRM_VCHRG_4V44 CPCAP_REG_CRM_VCHRG(0xf)
86
87 /*
88 * CPCAP_REG_CRM charge currents. These seem to match MC13783UG.pdf
89 * values in "Table 8-3. Charge Path Regulator Current Limit
90 * Characteristics" for the nominal values.
91 *
92 * Except 70mA and 1.596A and unlimited, these are simply 88.7mA / step.
93 */
94 #define CPCAP_REG_CRM_ICHRG(val) (((val) & 0xf) << 0)
95 #define CPCAP_REG_CRM_ICHRG_0A000 CPCAP_REG_CRM_ICHRG(0x0)
96 #define CPCAP_REG_CRM_ICHRG_0A070 CPCAP_REG_CRM_ICHRG(0x1)
97 #define CPCAP_REG_CRM_ICHRG_0A177 CPCAP_REG_CRM_ICHRG(0x2)
98 #define CPCAP_REG_CRM_ICHRG_0A266 CPCAP_REG_CRM_ICHRG(0x3)
99 #define CPCAP_REG_CRM_ICHRG_0A355 CPCAP_REG_CRM_ICHRG(0x4)
100 #define CPCAP_REG_CRM_ICHRG_0A443 CPCAP_REG_CRM_ICHRG(0x5)
101 #define CPCAP_REG_CRM_ICHRG_0A532 CPCAP_REG_CRM_ICHRG(0x6)
102 #define CPCAP_REG_CRM_ICHRG_0A621 CPCAP_REG_CRM_ICHRG(0x7)
103 #define CPCAP_REG_CRM_ICHRG_0A709 CPCAP_REG_CRM_ICHRG(0x8)
104 #define CPCAP_REG_CRM_ICHRG_0A798 CPCAP_REG_CRM_ICHRG(0x9)
105 #define CPCAP_REG_CRM_ICHRG_0A886 CPCAP_REG_CRM_ICHRG(0xa)
106 #define CPCAP_REG_CRM_ICHRG_0A975 CPCAP_REG_CRM_ICHRG(0xb)
107 #define CPCAP_REG_CRM_ICHRG_1A064 CPCAP_REG_CRM_ICHRG(0xc)
108 #define CPCAP_REG_CRM_ICHRG_1A152 CPCAP_REG_CRM_ICHRG(0xd)
109 #define CPCAP_REG_CRM_ICHRG_1A596 CPCAP_REG_CRM_ICHRG(0xe)
110 #define CPCAP_REG_CRM_ICHRG_NO_LIMIT CPCAP_REG_CRM_ICHRG(0xf)
111
112 /* CPCAP_REG_VUSBC register bits needed for VBUS */
113 #define CPCAP_BIT_VBUS_SWITCH BIT(0) /* VBUS boost to 5V */
114
115 enum {
116 CPCAP_CHARGER_IIO_BATTDET,
117 CPCAP_CHARGER_IIO_VOLTAGE,
118 CPCAP_CHARGER_IIO_VBUS,
119 CPCAP_CHARGER_IIO_CHRG_CURRENT,
120 CPCAP_CHARGER_IIO_BATT_CURRENT,
121 CPCAP_CHARGER_IIO_NR,
122 };
123
124 struct cpcap_charger_ddata {
125 struct device *dev;
126 struct regmap *reg;
127 struct list_head irq_list;
128 struct delayed_work detect_work;
129 struct delayed_work vbus_work;
130 struct gpio_desc *gpio[2]; /* gpio_reven0 & 1 */
131
132 struct iio_channel *channels[CPCAP_CHARGER_IIO_NR];
133
134 struct power_supply *usb;
135
136 struct phy_companion comparator; /* For USB VBUS */
137 unsigned int vbus_enabled:1;
138 unsigned int feeding_vbus:1;
139 atomic_t active;
140
141 int status;
142 int voltage;
143 int limit_current;
144 };
145
146 struct cpcap_interrupt_desc {
147 int irq;
148 struct list_head node;
149 const char *name;
150 };
151
152 struct cpcap_charger_ints_state {
153 bool chrg_det;
154 bool rvrs_chrg;
155 bool vbusov;
156
157 bool chrg_se1b;
158 bool rvrs_mode;
159 bool chrgcurr2;
160 bool chrgcurr1;
161 bool vbusvld;
162
163 bool battdetb;
164 };
165
166 static enum power_supply_property cpcap_charger_props[] = {
167 POWER_SUPPLY_PROP_STATUS,
168 POWER_SUPPLY_PROP_ONLINE,
169 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
170 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
171 POWER_SUPPLY_PROP_VOLTAGE_NOW,
172 POWER_SUPPLY_PROP_CURRENT_NOW,
173 };
174
cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata * ddata)175 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
176 {
177 struct iio_channel *channel;
178 int error, value = 0;
179
180 channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
181 error = iio_read_channel_processed(channel, &value);
182 if (error < 0) {
183 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
184
185 return 0;
186 }
187
188 return value;
189 }
190
cpcap_charger_get_charge_current(struct cpcap_charger_ddata * ddata)191 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
192 {
193 struct iio_channel *channel;
194 int error, value = 0;
195
196 channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
197 error = iio_read_channel_processed(channel, &value);
198 if (error < 0) {
199 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
200
201 return 0;
202 }
203
204 return value;
205 }
206
cpcap_charger_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)207 static int cpcap_charger_get_property(struct power_supply *psy,
208 enum power_supply_property psp,
209 union power_supply_propval *val)
210 {
211 struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
212
213 switch (psp) {
214 case POWER_SUPPLY_PROP_STATUS:
215 val->intval = ddata->status;
216 break;
217 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
218 val->intval = ddata->limit_current;
219 break;
220 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
221 val->intval = ddata->voltage;
222 break;
223 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
224 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
225 val->intval = cpcap_charger_get_charge_voltage(ddata) *
226 1000;
227 else
228 val->intval = 0;
229 break;
230 case POWER_SUPPLY_PROP_CURRENT_NOW:
231 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
232 val->intval = cpcap_charger_get_charge_current(ddata) *
233 1000;
234 else
235 val->intval = 0;
236 break;
237 case POWER_SUPPLY_PROP_ONLINE:
238 val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
239 break;
240 default:
241 return -EINVAL;
242 }
243
244 return 0;
245 }
246
cpcap_charger_match_voltage(int voltage)247 static int cpcap_charger_match_voltage(int voltage)
248 {
249 switch (voltage) {
250 case 0 ... 4100000 - 1: return 3800000;
251 case 4100000 ... 4120000 - 1: return 4100000;
252 case 4120000 ... 4150000 - 1: return 4120000;
253 case 4150000 ... 4170000 - 1: return 4150000;
254 case 4170000 ... 4200000 - 1: return 4170000;
255 case 4200000 ... 4230000 - 1: return 4200000;
256 case 4230000 ... 4250000 - 1: return 4230000;
257 case 4250000 ... 4270000 - 1: return 4250000;
258 case 4270000 ... 4300000 - 1: return 4270000;
259 case 4300000 ... 4330000 - 1: return 4300000;
260 case 4330000 ... 4350000 - 1: return 4330000;
261 case 4350000 ... 4380000 - 1: return 4350000;
262 case 4380000 ... 4400000 - 1: return 4380000;
263 case 4400000 ... 4420000 - 1: return 4400000;
264 case 4420000 ... 4440000 - 1: return 4420000;
265 case 4440000: return 4440000;
266 default: return 0;
267 }
268 }
269
270 static int
cpcap_charger_get_bat_const_charge_voltage(struct cpcap_charger_ddata * ddata)271 cpcap_charger_get_bat_const_charge_voltage(struct cpcap_charger_ddata *ddata)
272 {
273 union power_supply_propval prop;
274 struct power_supply *battery;
275 int voltage = ddata->voltage;
276 int error;
277
278 battery = power_supply_get_by_name("battery");
279 if (battery) {
280 error = power_supply_get_property(battery,
281 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
282 &prop);
283 if (!error)
284 voltage = prop.intval;
285
286 power_supply_put(battery);
287 }
288
289 return voltage;
290 }
291
cpcap_charger_current_to_regval(int microamp)292 static int cpcap_charger_current_to_regval(int microamp)
293 {
294 int miliamp = microamp / 1000;
295 int res;
296
297 if (miliamp < 0)
298 return -EINVAL;
299 if (miliamp < 70)
300 return CPCAP_REG_CRM_ICHRG(0x0);
301 if (miliamp < 177)
302 return CPCAP_REG_CRM_ICHRG(0x1);
303 if (miliamp >= 1596)
304 return CPCAP_REG_CRM_ICHRG(0xe);
305
306 res = microamp / 88666;
307 if (res > 0xd)
308 res = 0xd;
309 return CPCAP_REG_CRM_ICHRG(res);
310 }
311
cpcap_charger_set_property(struct power_supply * psy,enum power_supply_property psp,const union power_supply_propval * val)312 static int cpcap_charger_set_property(struct power_supply *psy,
313 enum power_supply_property psp,
314 const union power_supply_propval *val)
315 {
316 struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
317 int voltage, batvolt;
318
319 switch (psp) {
320 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
321 if (cpcap_charger_current_to_regval(val->intval) < 0)
322 return -EINVAL;
323 ddata->limit_current = val->intval;
324 schedule_delayed_work(&ddata->detect_work, 0);
325 break;
326 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
327 voltage = cpcap_charger_match_voltage(val->intval);
328 batvolt = cpcap_charger_get_bat_const_charge_voltage(ddata);
329 if (voltage > batvolt)
330 voltage = batvolt;
331 ddata->voltage = voltage;
332 schedule_delayed_work(&ddata->detect_work, 0);
333 break;
334 default:
335 return -EINVAL;
336 }
337
338 return 0;
339 }
340
cpcap_charger_property_is_writeable(struct power_supply * psy,enum power_supply_property psp)341 static int cpcap_charger_property_is_writeable(struct power_supply *psy,
342 enum power_supply_property psp)
343 {
344 switch (psp) {
345 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
346 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
347 return 1;
348 default:
349 return 0;
350 }
351 }
352
cpcap_charger_set_cable_path(struct cpcap_charger_ddata * ddata,bool enabled)353 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
354 bool enabled)
355 {
356 if (!ddata->gpio[0])
357 return;
358
359 gpiod_set_value(ddata->gpio[0], enabled);
360 }
361
cpcap_charger_set_inductive_path(struct cpcap_charger_ddata * ddata,bool enabled)362 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
363 bool enabled)
364 {
365 if (!ddata->gpio[1])
366 return;
367
368 gpiod_set_value(ddata->gpio[1], enabled);
369 }
370
cpcap_charger_update_state(struct cpcap_charger_ddata * ddata,int state)371 static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata,
372 int state)
373 {
374 const char *status;
375
376 if (state > POWER_SUPPLY_STATUS_FULL) {
377 dev_warn(ddata->dev, "unknown state: %i\n", state);
378
379 return;
380 }
381
382 ddata->status = state;
383
384 switch (state) {
385 case POWER_SUPPLY_STATUS_DISCHARGING:
386 status = "DISCONNECTED";
387 break;
388 case POWER_SUPPLY_STATUS_NOT_CHARGING:
389 status = "DETECTING";
390 break;
391 case POWER_SUPPLY_STATUS_CHARGING:
392 status = "CHARGING";
393 break;
394 case POWER_SUPPLY_STATUS_FULL:
395 status = "DONE";
396 break;
397 default:
398 return;
399 }
400
401 dev_dbg(ddata->dev, "state: %s\n", status);
402 }
403
cpcap_charger_disable(struct cpcap_charger_ddata * ddata)404 static int cpcap_charger_disable(struct cpcap_charger_ddata *ddata)
405 {
406 int error;
407
408 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
409 CPCAP_REG_CRM_FET_OVRD |
410 CPCAP_REG_CRM_FET_CTRL);
411 if (error)
412 dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
413
414 return error;
415 }
416
cpcap_charger_enable(struct cpcap_charger_ddata * ddata,int max_voltage,int charge_current,int trickle_current)417 static int cpcap_charger_enable(struct cpcap_charger_ddata *ddata,
418 int max_voltage, int charge_current,
419 int trickle_current)
420 {
421 int error;
422
423 if (!max_voltage || !charge_current)
424 return -EINVAL;
425
426 dev_dbg(ddata->dev, "enable: %i %i %i\n",
427 max_voltage, charge_current, trickle_current);
428
429 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
430 CPCAP_REG_CRM_CHRG_LED_EN |
431 trickle_current |
432 CPCAP_REG_CRM_FET_OVRD |
433 CPCAP_REG_CRM_FET_CTRL |
434 max_voltage |
435 charge_current);
436 if (error)
437 dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
438
439 return error;
440 }
441
cpcap_charger_vbus_valid(struct cpcap_charger_ddata * ddata)442 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
443 {
444 int error, value = 0;
445 struct iio_channel *channel =
446 ddata->channels[CPCAP_CHARGER_IIO_VBUS];
447
448 error = iio_read_channel_processed(channel, &value);
449 if (error >= 0)
450 return value > 3900;
451
452 dev_err(ddata->dev, "error reading VBUS: %i\n", error);
453
454 return false;
455 }
456
457 /* VBUS control functions for the USB PHY companion */
cpcap_charger_vbus_work(struct work_struct * work)458 static void cpcap_charger_vbus_work(struct work_struct *work)
459 {
460 struct cpcap_charger_ddata *ddata;
461 bool vbus = false;
462 int error;
463
464 ddata = container_of(work, struct cpcap_charger_ddata,
465 vbus_work.work);
466
467 if (ddata->vbus_enabled) {
468 vbus = cpcap_charger_vbus_valid(ddata);
469 if (vbus) {
470 dev_dbg(ddata->dev, "VBUS already provided\n");
471
472 return;
473 }
474
475 ddata->feeding_vbus = true;
476 cpcap_charger_set_cable_path(ddata, false);
477 cpcap_charger_set_inductive_path(ddata, false);
478
479 error = cpcap_charger_disable(ddata);
480 if (error)
481 goto out_err;
482
483 cpcap_charger_update_state(ddata,
484 POWER_SUPPLY_STATUS_DISCHARGING);
485
486 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
487 CPCAP_BIT_VBUS_SWITCH,
488 CPCAP_BIT_VBUS_SWITCH);
489 if (error)
490 goto out_err;
491
492 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
493 CPCAP_REG_CRM_RVRSMODE,
494 CPCAP_REG_CRM_RVRSMODE);
495 if (error)
496 goto out_err;
497 } else {
498 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
499 CPCAP_BIT_VBUS_SWITCH, 0);
500 if (error)
501 goto out_err;
502
503 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
504 CPCAP_REG_CRM_RVRSMODE, 0);
505 if (error)
506 goto out_err;
507
508 cpcap_charger_set_cable_path(ddata, true);
509 cpcap_charger_set_inductive_path(ddata, true);
510 ddata->feeding_vbus = false;
511 }
512
513 return;
514
515 out_err:
516 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
517 dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
518 ddata->vbus_enabled ? "enable" : "disable", error);
519 }
520
cpcap_charger_set_vbus(struct phy_companion * comparator,bool enabled)521 static int cpcap_charger_set_vbus(struct phy_companion *comparator,
522 bool enabled)
523 {
524 struct cpcap_charger_ddata *ddata =
525 container_of(comparator, struct cpcap_charger_ddata,
526 comparator);
527
528 ddata->vbus_enabled = enabled;
529 schedule_delayed_work(&ddata->vbus_work, 0);
530
531 return 0;
532 }
533
534 /* Charger interrupt handling functions */
535
cpcap_charger_get_ints_state(struct cpcap_charger_ddata * ddata,struct cpcap_charger_ints_state * s)536 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
537 struct cpcap_charger_ints_state *s)
538 {
539 int val, error;
540
541 error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
542 if (error)
543 return error;
544
545 s->chrg_det = val & BIT(13);
546 s->rvrs_chrg = val & BIT(12);
547 s->vbusov = val & BIT(11);
548
549 error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
550 if (error)
551 return error;
552
553 s->chrg_se1b = val & BIT(13);
554 s->rvrs_mode = val & BIT(6);
555 s->chrgcurr2 = val & BIT(5);
556 s->chrgcurr1 = val & BIT(4);
557 s->vbusvld = val & BIT(3);
558
559 error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
560 if (error)
561 return error;
562
563 s->battdetb = val & BIT(6);
564
565 return 0;
566 }
567
cpcap_charger_voltage_to_regval(int voltage)568 static int cpcap_charger_voltage_to_regval(int voltage)
569 {
570 int offset;
571
572 switch (voltage) {
573 case 0 ... 4100000 - 1:
574 return 0;
575 case 4100000 ... 4200000 - 1:
576 offset = 1;
577 break;
578 case 4200000 ... 4300000 - 1:
579 offset = 0;
580 break;
581 case 4300000 ... 4380000 - 1:
582 offset = -1;
583 break;
584 case 4380000 ... 4440000:
585 offset = -2;
586 break;
587 default:
588 return 0;
589 }
590
591 return ((voltage - 4100000) / 20000) + offset;
592 }
593
cpcap_charger_disconnect(struct cpcap_charger_ddata * ddata,int state,unsigned long delay)594 static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata,
595 int state, unsigned long delay)
596 {
597 int error;
598
599 /* Update battery state before disconnecting the charger */
600 switch (state) {
601 case POWER_SUPPLY_STATUS_DISCHARGING:
602 case POWER_SUPPLY_STATUS_FULL:
603 power_supply_changed(ddata->usb);
604 break;
605 default:
606 break;
607 }
608
609 error = cpcap_charger_disable(ddata);
610 if (error) {
611 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
612 return;
613 }
614
615 cpcap_charger_update_state(ddata, state);
616 power_supply_changed(ddata->usb);
617 schedule_delayed_work(&ddata->detect_work, delay);
618 }
619
cpcap_usb_detect(struct work_struct * work)620 static void cpcap_usb_detect(struct work_struct *work)
621 {
622 struct cpcap_charger_ddata *ddata;
623 struct cpcap_charger_ints_state s;
624 int error, new_state;
625
626 ddata = container_of(work, struct cpcap_charger_ddata,
627 detect_work.work);
628
629 error = cpcap_charger_get_ints_state(ddata, &s);
630 if (error)
631 return;
632
633 /* Just init the state if a charger is connected with no chrg_det set */
634 if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) {
635 cpcap_charger_update_state(ddata,
636 POWER_SUPPLY_STATUS_NOT_CHARGING);
637
638 return;
639 }
640
641 /*
642 * If battery voltage is higher than charge voltage, it may have been
643 * charged to 4.35V by Android. Try again in 10 minutes.
644 */
645 if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) {
646 cpcap_charger_disconnect(ddata,
647 POWER_SUPPLY_STATUS_NOT_CHARGING,
648 HZ * 60 * 10);
649
650 return;
651 }
652
653 /* Delay for 80ms to avoid vbus bouncing when usb cable is plugged in */
654 usleep_range(80000, 120000);
655
656 /* Throttle chrgcurr2 interrupt for charger done and retry */
657 switch (ddata->status) {
658 case POWER_SUPPLY_STATUS_CHARGING:
659 if (s.chrgcurr2)
660 break;
661 new_state = POWER_SUPPLY_STATUS_FULL;
662
663 if (s.chrgcurr1 && s.vbusvld) {
664 cpcap_charger_disconnect(ddata, new_state, HZ * 5);
665 return;
666 }
667 break;
668 case POWER_SUPPLY_STATUS_FULL:
669 if (!s.chrgcurr2)
670 break;
671 if (s.vbusvld)
672 new_state = POWER_SUPPLY_STATUS_NOT_CHARGING;
673 else
674 new_state = POWER_SUPPLY_STATUS_DISCHARGING;
675
676 cpcap_charger_disconnect(ddata, new_state, HZ * 5);
677
678 return;
679 default:
680 break;
681 }
682
683 if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) &&
684 s.chrgcurr1) {
685 int max_current;
686 int vchrg, ichrg;
687 union power_supply_propval val;
688 struct power_supply *battery;
689
690 battery = power_supply_get_by_name("battery");
691 if (IS_ERR_OR_NULL(battery)) {
692 dev_err(ddata->dev, "battery power_supply not available %li\n",
693 PTR_ERR(battery));
694 return;
695 }
696
697 error = power_supply_get_property(battery, POWER_SUPPLY_PROP_PRESENT, &val);
698 power_supply_put(battery);
699 if (error)
700 goto out_err;
701
702 if (val.intval) {
703 max_current = 1596000;
704 } else {
705 dev_info(ddata->dev, "battery not inserted, charging disabled\n");
706 max_current = 0;
707 }
708
709 if (max_current > ddata->limit_current)
710 max_current = ddata->limit_current;
711
712 ichrg = cpcap_charger_current_to_regval(max_current);
713 vchrg = cpcap_charger_voltage_to_regval(ddata->voltage);
714 error = cpcap_charger_enable(ddata,
715 CPCAP_REG_CRM_VCHRG(vchrg),
716 ichrg, 0);
717 if (error)
718 goto out_err;
719 cpcap_charger_update_state(ddata,
720 POWER_SUPPLY_STATUS_CHARGING);
721 } else {
722 error = cpcap_charger_disable(ddata);
723 if (error)
724 goto out_err;
725 cpcap_charger_update_state(ddata,
726 POWER_SUPPLY_STATUS_DISCHARGING);
727 }
728
729 power_supply_changed(ddata->usb);
730 return;
731
732 out_err:
733 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
734 dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
735 }
736
cpcap_charger_irq_thread(int irq,void * data)737 static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
738 {
739 struct cpcap_charger_ddata *ddata = data;
740
741 if (!atomic_read(&ddata->active))
742 return IRQ_NONE;
743
744 schedule_delayed_work(&ddata->detect_work, 0);
745
746 return IRQ_HANDLED;
747 }
748
cpcap_usb_init_irq(struct platform_device * pdev,struct cpcap_charger_ddata * ddata,const char * name)749 static int cpcap_usb_init_irq(struct platform_device *pdev,
750 struct cpcap_charger_ddata *ddata,
751 const char *name)
752 {
753 struct cpcap_interrupt_desc *d;
754 int irq, error;
755
756 irq = platform_get_irq_byname(pdev, name);
757 if (irq < 0)
758 return -ENODEV;
759
760 error = devm_request_threaded_irq(ddata->dev, irq, NULL,
761 cpcap_charger_irq_thread,
762 IRQF_SHARED | IRQF_ONESHOT,
763 name, ddata);
764 if (error) {
765 dev_err(ddata->dev, "could not get irq %s: %i\n",
766 name, error);
767
768 return error;
769 }
770
771 d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
772 if (!d)
773 return -ENOMEM;
774
775 d->name = name;
776 d->irq = irq;
777 list_add(&d->node, &ddata->irq_list);
778
779 return 0;
780 }
781
782 static const char * const cpcap_charger_irqs[] = {
783 /* REG_INT_0 */
784 "chrg_det", "rvrs_chrg",
785
786 /* REG_INT1 */
787 "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld",
788
789 /* REG_INT_3 */
790 "battdetb",
791 };
792
cpcap_usb_init_interrupts(struct platform_device * pdev,struct cpcap_charger_ddata * ddata)793 static int cpcap_usb_init_interrupts(struct platform_device *pdev,
794 struct cpcap_charger_ddata *ddata)
795 {
796 int i, error;
797
798 for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
799 error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
800 if (error)
801 return error;
802 }
803
804 return 0;
805 }
806
cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata * ddata)807 static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
808 {
809 int i;
810
811 for (i = 0; i < 2; i++) {
812 ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
813 i, GPIOD_OUT_HIGH);
814 if (IS_ERR(ddata->gpio[i])) {
815 dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
816 i, PTR_ERR(ddata->gpio[i]));
817 ddata->gpio[i] = NULL;
818 }
819 }
820 }
821
cpcap_charger_init_iio(struct cpcap_charger_ddata * ddata)822 static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
823 {
824 const char * const names[CPCAP_CHARGER_IIO_NR] = {
825 "battdetb", "battp", "vbus", "chg_isense", "batti",
826 };
827 int error, i;
828
829 for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
830 ddata->channels[i] = devm_iio_channel_get(ddata->dev,
831 names[i]);
832 if (IS_ERR(ddata->channels[i])) {
833 error = PTR_ERR(ddata->channels[i]);
834 goto out_err;
835 }
836
837 if (!ddata->channels[i]->indio_dev) {
838 error = -ENXIO;
839 goto out_err;
840 }
841 }
842
843 return 0;
844
845 out_err:
846 if (error != -EPROBE_DEFER)
847 dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
848 error);
849
850 return error;
851 }
852
853 static char *cpcap_charger_supplied_to[] = {
854 "battery",
855 };
856
857 static const struct power_supply_desc cpcap_charger_usb_desc = {
858 .name = "usb",
859 .type = POWER_SUPPLY_TYPE_USB,
860 .properties = cpcap_charger_props,
861 .num_properties = ARRAY_SIZE(cpcap_charger_props),
862 .get_property = cpcap_charger_get_property,
863 .set_property = cpcap_charger_set_property,
864 .property_is_writeable = cpcap_charger_property_is_writeable,
865 };
866
867 static const struct of_device_id cpcap_charger_id_table[] = {
868 {
869 .compatible = "motorola,mapphone-cpcap-charger",
870 },
871 {},
872 };
873 MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
874
cpcap_charger_probe(struct platform_device * pdev)875 static int cpcap_charger_probe(struct platform_device *pdev)
876 {
877 struct cpcap_charger_ddata *ddata;
878 struct power_supply_config psy_cfg = {};
879 int error;
880
881 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
882 if (!ddata)
883 return -ENOMEM;
884
885 ddata->dev = &pdev->dev;
886 ddata->voltage = 4200000;
887 ddata->limit_current = 532000;
888
889 ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
890 if (!ddata->reg)
891 return -ENODEV;
892
893 INIT_LIST_HEAD(&ddata->irq_list);
894 INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
895 INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
896 platform_set_drvdata(pdev, ddata);
897
898 error = cpcap_charger_init_iio(ddata);
899 if (error)
900 return error;
901
902 atomic_set(&ddata->active, 1);
903
904 psy_cfg.of_node = pdev->dev.of_node;
905 psy_cfg.drv_data = ddata;
906 psy_cfg.supplied_to = cpcap_charger_supplied_to;
907 psy_cfg.num_supplicants = ARRAY_SIZE(cpcap_charger_supplied_to);
908
909 ddata->usb = devm_power_supply_register(ddata->dev,
910 &cpcap_charger_usb_desc,
911 &psy_cfg);
912 if (IS_ERR(ddata->usb)) {
913 error = PTR_ERR(ddata->usb);
914 dev_err(ddata->dev, "failed to register USB charger: %i\n",
915 error);
916
917 return error;
918 }
919
920 error = cpcap_usb_init_interrupts(pdev, ddata);
921 if (error)
922 return error;
923
924 ddata->comparator.set_vbus = cpcap_charger_set_vbus;
925 error = omap_usb2_set_comparator(&ddata->comparator);
926 if (error == -ENODEV) {
927 dev_info(ddata->dev, "charger needs phy, deferring probe\n");
928 return -EPROBE_DEFER;
929 }
930
931 cpcap_charger_init_optional_gpios(ddata);
932
933 schedule_delayed_work(&ddata->detect_work, 0);
934
935 return 0;
936 }
937
cpcap_charger_shutdown(struct platform_device * pdev)938 static void cpcap_charger_shutdown(struct platform_device *pdev)
939 {
940 struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
941 int error;
942
943 atomic_set(&ddata->active, 0);
944 error = omap_usb2_set_comparator(NULL);
945 if (error)
946 dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
947 error);
948
949 error = cpcap_charger_disable(ddata);
950 if (error) {
951 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
952 dev_warn(ddata->dev, "could not clear charger: %i\n",
953 error);
954 }
955 cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_DISCHARGING);
956 cancel_delayed_work_sync(&ddata->vbus_work);
957 cancel_delayed_work_sync(&ddata->detect_work);
958 }
959
cpcap_charger_remove(struct platform_device * pdev)960 static void cpcap_charger_remove(struct platform_device *pdev)
961 {
962 cpcap_charger_shutdown(pdev);
963 }
964
965 static struct platform_driver cpcap_charger_driver = {
966 .probe = cpcap_charger_probe,
967 .driver = {
968 .name = "cpcap-charger",
969 .of_match_table = cpcap_charger_id_table,
970 },
971 .shutdown = cpcap_charger_shutdown,
972 .remove_new = cpcap_charger_remove,
973 };
974 module_platform_driver(cpcap_charger_driver);
975
976 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
977 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
978 MODULE_LICENSE("GPL v2");
979 MODULE_ALIAS("platform:cpcap-charger");
980