1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Summit Microelectronics SMB347 Battery Charger Driver
4 *
5 * Copyright (C) 2011, Intel Corporation
6 *
7 * Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>
8 * Mika Westerberg <mika.westerberg@linux.intel.com>
9 */
10
11 #include <linux/delay.h>
12 #include <linux/err.h>
13 #include <linux/gpio.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/i2c.h>
19 #include <linux/power_supply.h>
20 #include <linux/property.h>
21 #include <linux/regmap.h>
22
23 #include <dt-bindings/power/summit,smb347-charger.h>
24
25 /* Use the default compensation method */
26 #define SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT -1
27
28 /* Use default factory programmed value for hard/soft temperature limit */
29 #define SMB3XX_TEMP_USE_DEFAULT -273
30
31 /*
32 * Configuration registers. These are mirrored to volatile RAM and can be
33 * written once %CMD_A_ALLOW_WRITE is set in %CMD_A register. They will be
34 * reloaded from non-volatile registers after POR.
35 */
36 #define CFG_CHARGE_CURRENT 0x00
37 #define CFG_CHARGE_CURRENT_FCC_MASK 0xe0
38 #define CFG_CHARGE_CURRENT_FCC_SHIFT 5
39 #define CFG_CHARGE_CURRENT_PCC_MASK 0x18
40 #define CFG_CHARGE_CURRENT_PCC_SHIFT 3
41 #define CFG_CHARGE_CURRENT_TC_MASK 0x07
42 #define CFG_CURRENT_LIMIT 0x01
43 #define CFG_CURRENT_LIMIT_DC_MASK 0xf0
44 #define CFG_CURRENT_LIMIT_DC_SHIFT 4
45 #define CFG_CURRENT_LIMIT_USB_MASK 0x0f
46 #define CFG_FLOAT_VOLTAGE 0x03
47 #define CFG_FLOAT_VOLTAGE_FLOAT_MASK 0x3f
48 #define CFG_FLOAT_VOLTAGE_THRESHOLD_MASK 0xc0
49 #define CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT 6
50 #define CFG_STAT 0x05
51 #define CFG_STAT_DISABLED BIT(5)
52 #define CFG_STAT_ACTIVE_HIGH BIT(7)
53 #define CFG_PIN 0x06
54 #define CFG_PIN_EN_CTRL_MASK 0x60
55 #define CFG_PIN_EN_CTRL_ACTIVE_HIGH 0x40
56 #define CFG_PIN_EN_CTRL_ACTIVE_LOW 0x60
57 #define CFG_PIN_EN_APSD_IRQ BIT(1)
58 #define CFG_PIN_EN_CHARGER_ERROR BIT(2)
59 #define CFG_PIN_EN_CTRL BIT(4)
60 #define CFG_THERM 0x07
61 #define CFG_THERM_SOFT_HOT_COMPENSATION_MASK 0x03
62 #define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT 0
63 #define CFG_THERM_SOFT_COLD_COMPENSATION_MASK 0x0c
64 #define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT 2
65 #define CFG_THERM_MONITOR_DISABLED BIT(4)
66 #define CFG_SYSOK 0x08
67 #define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED BIT(2)
68 #define CFG_OTHER 0x09
69 #define CFG_OTHER_RID_MASK 0xc0
70 #define CFG_OTHER_RID_ENABLED_AUTO_OTG 0xc0
71 #define CFG_OTG 0x0a
72 #define CFG_OTG_TEMP_THRESHOLD_MASK 0x30
73 #define CFG_OTG_TEMP_THRESHOLD_SHIFT 4
74 #define CFG_OTG_CC_COMPENSATION_MASK 0xc0
75 #define CFG_OTG_CC_COMPENSATION_SHIFT 6
76 #define CFG_TEMP_LIMIT 0x0b
77 #define CFG_TEMP_LIMIT_SOFT_HOT_MASK 0x03
78 #define CFG_TEMP_LIMIT_SOFT_HOT_SHIFT 0
79 #define CFG_TEMP_LIMIT_SOFT_COLD_MASK 0x0c
80 #define CFG_TEMP_LIMIT_SOFT_COLD_SHIFT 2
81 #define CFG_TEMP_LIMIT_HARD_HOT_MASK 0x30
82 #define CFG_TEMP_LIMIT_HARD_HOT_SHIFT 4
83 #define CFG_TEMP_LIMIT_HARD_COLD_MASK 0xc0
84 #define CFG_TEMP_LIMIT_HARD_COLD_SHIFT 6
85 #define CFG_FAULT_IRQ 0x0c
86 #define CFG_FAULT_IRQ_DCIN_UV BIT(2)
87 #define CFG_STATUS_IRQ 0x0d
88 #define CFG_STATUS_IRQ_TERMINATION_OR_TAPER BIT(4)
89 #define CFG_STATUS_IRQ_CHARGE_TIMEOUT BIT(7)
90 #define CFG_ADDRESS 0x0e
91
92 /* Command registers */
93 #define CMD_A 0x30
94 #define CMD_A_CHG_ENABLED BIT(1)
95 #define CMD_A_SUSPEND_ENABLED BIT(2)
96 #define CMD_A_ALLOW_WRITE BIT(7)
97 #define CMD_B 0x31
98 #define CMD_C 0x33
99
100 /* Interrupt Status registers */
101 #define IRQSTAT_A 0x35
102 #define IRQSTAT_C 0x37
103 #define IRQSTAT_C_TERMINATION_STAT BIT(0)
104 #define IRQSTAT_C_TERMINATION_IRQ BIT(1)
105 #define IRQSTAT_C_TAPER_IRQ BIT(3)
106 #define IRQSTAT_D 0x38
107 #define IRQSTAT_D_CHARGE_TIMEOUT_STAT BIT(2)
108 #define IRQSTAT_D_CHARGE_TIMEOUT_IRQ BIT(3)
109 #define IRQSTAT_E 0x39
110 #define IRQSTAT_E_USBIN_UV_STAT BIT(0)
111 #define IRQSTAT_E_USBIN_UV_IRQ BIT(1)
112 #define IRQSTAT_E_DCIN_UV_STAT BIT(4)
113 #define IRQSTAT_E_DCIN_UV_IRQ BIT(5)
114 #define IRQSTAT_F 0x3a
115
116 /* Status registers */
117 #define STAT_A 0x3b
118 #define STAT_A_FLOAT_VOLTAGE_MASK 0x3f
119 #define STAT_B 0x3c
120 #define STAT_C 0x3d
121 #define STAT_C_CHG_ENABLED BIT(0)
122 #define STAT_C_HOLDOFF_STAT BIT(3)
123 #define STAT_C_CHG_MASK 0x06
124 #define STAT_C_CHG_SHIFT 1
125 #define STAT_C_CHG_TERM BIT(5)
126 #define STAT_C_CHARGER_ERROR BIT(6)
127 #define STAT_E 0x3f
128
129 #define SMB347_MAX_REGISTER 0x3f
130
131 /**
132 * struct smb347_charger - smb347 charger instance
133 * @dev: pointer to device
134 * @regmap: pointer to driver regmap
135 * @mains: power_supply instance for AC/DC power
136 * @usb: power_supply instance for USB power
137 * @id: SMB charger ID
138 * @mains_online: is AC/DC input connected
139 * @usb_online: is USB input connected
140 * @charging_enabled: is charging enabled
141 * @irq_unsupported: is interrupt unsupported by SMB hardware
142 * @max_charge_current: maximum current (in uA) the battery can be charged
143 * @max_charge_voltage: maximum voltage (in uV) the battery can be charged
144 * @pre_charge_current: current (in uA) to use in pre-charging phase
145 * @termination_current: current (in uA) used to determine when the
146 * charging cycle terminates
147 * @pre_to_fast_voltage: voltage (in uV) treshold used for transitioning to
148 * pre-charge to fast charge mode
149 * @mains_current_limit: maximum input current drawn from AC/DC input (in uA)
150 * @usb_hc_current_limit: maximum input high current (in uA) drawn from USB
151 * input
152 * @chip_temp_threshold: die temperature where device starts limiting charge
153 * current [%100 - %130] (in degree C)
154 * @soft_cold_temp_limit: soft cold temperature limit [%0 - %15] (in degree C),
155 * granularity is 5 deg C.
156 * @soft_hot_temp_limit: soft hot temperature limit [%40 - %55] (in degree C),
157 * granularity is 5 deg C.
158 * @hard_cold_temp_limit: hard cold temperature limit [%-5 - %10] (in degree C),
159 * granularity is 5 deg C.
160 * @hard_hot_temp_limit: hard hot temperature limit [%50 - %65] (in degree C),
161 * granularity is 5 deg C.
162 * @suspend_on_hard_temp_limit: suspend charging when hard limit is hit
163 * @soft_temp_limit_compensation: compensation method when soft temperature
164 * limit is hit
165 * @charge_current_compensation: current (in uA) for charging compensation
166 * current when temperature hits soft limits
167 * @use_mains: AC/DC input can be used
168 * @use_usb: USB input can be used
169 * @use_usb_otg: USB OTG output can be used (not implemented yet)
170 * @enable_control: how charging enable/disable is controlled
171 * (driver/pin controls)
172 *
173 * @use_main, @use_usb, and @use_usb_otg are means to enable/disable
174 * hardware support for these. This is useful when we want to have for
175 * example OTG charging controlled via OTG transceiver driver and not by
176 * the SMB347 hardware.
177 *
178 * Hard and soft temperature limit values are given as described in the
179 * device data sheet and assuming NTC beta value is %3750. Even if this is
180 * not the case, these values should be used. They can be mapped to the
181 * corresponding NTC beta values with the help of table %2 in the data
182 * sheet. So for example if NTC beta is %3375 and we want to program hard
183 * hot limit to be %53 deg C, @hard_hot_temp_limit should be set to %50.
184 *
185 * If zero value is given in any of the current and voltage values, the
186 * factory programmed default will be used. For soft/hard temperature
187 * values, pass in %SMB3XX_TEMP_USE_DEFAULT instead.
188 */
189 struct smb347_charger {
190 struct device *dev;
191 struct regmap *regmap;
192 struct power_supply *mains;
193 struct power_supply *usb;
194 unsigned int id;
195 bool mains_online;
196 bool usb_online;
197 bool charging_enabled;
198 bool irq_unsupported;
199
200 unsigned int max_charge_current;
201 unsigned int max_charge_voltage;
202 unsigned int pre_charge_current;
203 unsigned int termination_current;
204 unsigned int pre_to_fast_voltage;
205 unsigned int mains_current_limit;
206 unsigned int usb_hc_current_limit;
207 unsigned int chip_temp_threshold;
208 int soft_cold_temp_limit;
209 int soft_hot_temp_limit;
210 int hard_cold_temp_limit;
211 int hard_hot_temp_limit;
212 bool suspend_on_hard_temp_limit;
213 unsigned int soft_temp_limit_compensation;
214 unsigned int charge_current_compensation;
215 bool use_mains;
216 bool use_usb;
217 bool use_usb_otg;
218 unsigned int enable_control;
219 };
220
221 enum smb_charger_chipid {
222 SMB345,
223 SMB347,
224 SMB358,
225 NUM_CHIP_TYPES,
226 };
227
228 /* Fast charge current in uA */
229 static const unsigned int fcc_tbl[NUM_CHIP_TYPES][8] = {
230 [SMB345] = { 200000, 450000, 600000, 900000,
231 1300000, 1500000, 1800000, 2000000 },
232 [SMB347] = { 700000, 900000, 1200000, 1500000,
233 1800000, 2000000, 2200000, 2500000 },
234 [SMB358] = { 200000, 450000, 600000, 900000,
235 1300000, 1500000, 1800000, 2000000 },
236 };
237 /* Pre-charge current in uA */
238 static const unsigned int pcc_tbl[NUM_CHIP_TYPES][4] = {
239 [SMB345] = { 150000, 250000, 350000, 450000 },
240 [SMB347] = { 100000, 150000, 200000, 250000 },
241 [SMB358] = { 150000, 250000, 350000, 450000 },
242 };
243
244 /* Termination current in uA */
245 static const unsigned int tc_tbl[NUM_CHIP_TYPES][8] = {
246 [SMB345] = { 30000, 40000, 60000, 80000,
247 100000, 125000, 150000, 200000 },
248 [SMB347] = { 37500, 50000, 100000, 150000,
249 200000, 250000, 500000, 600000 },
250 [SMB358] = { 30000, 40000, 60000, 80000,
251 100000, 125000, 150000, 200000 },
252 };
253
254 /* Input current limit in uA */
255 static const unsigned int icl_tbl[NUM_CHIP_TYPES][10] = {
256 [SMB345] = { 300000, 500000, 700000, 1000000, 1500000,
257 1800000, 2000000, 2000000, 2000000, 2000000 },
258 [SMB347] = { 300000, 500000, 700000, 900000, 1200000,
259 1500000, 1800000, 2000000, 2200000, 2500000 },
260 [SMB358] = { 300000, 500000, 700000, 1000000, 1500000,
261 1800000, 2000000, 2000000, 2000000, 2000000 },
262 };
263
264 /* Charge current compensation in uA */
265 static const unsigned int ccc_tbl[NUM_CHIP_TYPES][4] = {
266 [SMB345] = { 200000, 450000, 600000, 900000 },
267 [SMB347] = { 250000, 700000, 900000, 1200000 },
268 [SMB358] = { 200000, 450000, 600000, 900000 },
269 };
270
271 /* Convert register value to current using lookup table */
hw_to_current(const unsigned int * tbl,size_t size,unsigned int val)272 static int hw_to_current(const unsigned int *tbl, size_t size, unsigned int val)
273 {
274 if (val >= size)
275 return -EINVAL;
276 return tbl[val];
277 }
278
279 /* Convert current to register value using lookup table */
current_to_hw(const unsigned int * tbl,size_t size,unsigned int val)280 static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)
281 {
282 size_t i;
283
284 for (i = 0; i < size; i++)
285 if (val < tbl[i])
286 break;
287 return i > 0 ? i - 1 : -EINVAL;
288 }
289
290 /**
291 * smb347_update_ps_status - refreshes the power source status
292 * @smb: pointer to smb347 charger instance
293 *
294 * Function checks whether any power source is connected to the charger and
295 * updates internal state accordingly. If there is a change to previous state
296 * function returns %1, otherwise %0 and negative errno in case of errror.
297 */
smb347_update_ps_status(struct smb347_charger * smb)298 static int smb347_update_ps_status(struct smb347_charger *smb)
299 {
300 bool usb = false;
301 bool dc = false;
302 unsigned int val;
303 int ret;
304
305 ret = regmap_read(smb->regmap, IRQSTAT_E, &val);
306 if (ret < 0)
307 return ret;
308
309 /*
310 * Dc and usb are set depending on whether they are enabled in
311 * platform data _and_ whether corresponding undervoltage is set.
312 */
313 if (smb->use_mains)
314 dc = !(val & IRQSTAT_E_DCIN_UV_STAT);
315 if (smb->use_usb)
316 usb = !(val & IRQSTAT_E_USBIN_UV_STAT);
317
318 ret = smb->mains_online != dc || smb->usb_online != usb;
319 smb->mains_online = dc;
320 smb->usb_online = usb;
321
322 return ret;
323 }
324
325 /*
326 * smb347_is_ps_online - returns whether input power source is connected
327 * @smb: pointer to smb347 charger instance
328 *
329 * Returns %true if input power source is connected. Note that this is
330 * dependent on what platform has configured for usable power sources. For
331 * example if USB is disabled, this will return %false even if the USB cable
332 * is connected.
333 */
smb347_is_ps_online(struct smb347_charger * smb)334 static bool smb347_is_ps_online(struct smb347_charger *smb)
335 {
336 return smb->usb_online || smb->mains_online;
337 }
338
339 /**
340 * smb347_charging_status - returns status of charging
341 * @smb: pointer to smb347 charger instance
342 *
343 * Function returns charging status. %0 means no charging is in progress,
344 * %1 means pre-charging, %2 fast-charging and %3 taper-charging.
345 */
smb347_charging_status(struct smb347_charger * smb)346 static int smb347_charging_status(struct smb347_charger *smb)
347 {
348 unsigned int val;
349 int ret;
350
351 if (!smb347_is_ps_online(smb))
352 return 0;
353
354 ret = regmap_read(smb->regmap, STAT_C, &val);
355 if (ret < 0)
356 return 0;
357
358 return (val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT;
359 }
360
smb347_charging_set(struct smb347_charger * smb,bool enable)361 static int smb347_charging_set(struct smb347_charger *smb, bool enable)
362 {
363 int ret = 0;
364
365 if (smb->enable_control != SMB3XX_CHG_ENABLE_SW) {
366 dev_dbg(smb->dev, "charging enable/disable in SW disabled\n");
367 return 0;
368 }
369
370 if (smb->charging_enabled != enable) {
371 ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED,
372 enable ? CMD_A_CHG_ENABLED : 0);
373 if (!ret)
374 smb->charging_enabled = enable;
375 }
376
377 return ret;
378 }
379
smb347_charging_enable(struct smb347_charger * smb)380 static inline int smb347_charging_enable(struct smb347_charger *smb)
381 {
382 return smb347_charging_set(smb, true);
383 }
384
smb347_charging_disable(struct smb347_charger * smb)385 static inline int smb347_charging_disable(struct smb347_charger *smb)
386 {
387 return smb347_charging_set(smb, false);
388 }
389
smb347_start_stop_charging(struct smb347_charger * smb)390 static int smb347_start_stop_charging(struct smb347_charger *smb)
391 {
392 int ret;
393
394 /*
395 * Depending on whether valid power source is connected or not, we
396 * disable or enable the charging. We do it manually because it
397 * depends on how the platform has configured the valid inputs.
398 */
399 if (smb347_is_ps_online(smb)) {
400 ret = smb347_charging_enable(smb);
401 if (ret < 0)
402 dev_err(smb->dev, "failed to enable charging\n");
403 } else {
404 ret = smb347_charging_disable(smb);
405 if (ret < 0)
406 dev_err(smb->dev, "failed to disable charging\n");
407 }
408
409 return ret;
410 }
411
smb347_set_charge_current(struct smb347_charger * smb)412 static int smb347_set_charge_current(struct smb347_charger *smb)
413 {
414 unsigned int id = smb->id;
415 int ret;
416
417 if (smb->max_charge_current) {
418 ret = current_to_hw(fcc_tbl[id], ARRAY_SIZE(fcc_tbl[id]),
419 smb->max_charge_current);
420 if (ret < 0)
421 return ret;
422
423 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
424 CFG_CHARGE_CURRENT_FCC_MASK,
425 ret << CFG_CHARGE_CURRENT_FCC_SHIFT);
426 if (ret < 0)
427 return ret;
428 }
429
430 if (smb->pre_charge_current) {
431 ret = current_to_hw(pcc_tbl[id], ARRAY_SIZE(pcc_tbl[id]),
432 smb->pre_charge_current);
433 if (ret < 0)
434 return ret;
435
436 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
437 CFG_CHARGE_CURRENT_PCC_MASK,
438 ret << CFG_CHARGE_CURRENT_PCC_SHIFT);
439 if (ret < 0)
440 return ret;
441 }
442
443 if (smb->termination_current) {
444 ret = current_to_hw(tc_tbl[id], ARRAY_SIZE(tc_tbl[id]),
445 smb->termination_current);
446 if (ret < 0)
447 return ret;
448
449 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
450 CFG_CHARGE_CURRENT_TC_MASK, ret);
451 if (ret < 0)
452 return ret;
453 }
454
455 return 0;
456 }
457
smb347_set_current_limits(struct smb347_charger * smb)458 static int smb347_set_current_limits(struct smb347_charger *smb)
459 {
460 unsigned int id = smb->id;
461 int ret;
462
463 if (smb->mains_current_limit) {
464 ret = current_to_hw(icl_tbl[id], ARRAY_SIZE(icl_tbl[id]),
465 smb->mains_current_limit);
466 if (ret < 0)
467 return ret;
468
469 ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
470 CFG_CURRENT_LIMIT_DC_MASK,
471 ret << CFG_CURRENT_LIMIT_DC_SHIFT);
472 if (ret < 0)
473 return ret;
474 }
475
476 if (smb->usb_hc_current_limit) {
477 ret = current_to_hw(icl_tbl[id], ARRAY_SIZE(icl_tbl[id]),
478 smb->usb_hc_current_limit);
479 if (ret < 0)
480 return ret;
481
482 ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
483 CFG_CURRENT_LIMIT_USB_MASK, ret);
484 if (ret < 0)
485 return ret;
486 }
487
488 return 0;
489 }
490
smb347_set_voltage_limits(struct smb347_charger * smb)491 static int smb347_set_voltage_limits(struct smb347_charger *smb)
492 {
493 int ret;
494
495 if (smb->pre_to_fast_voltage) {
496 ret = smb->pre_to_fast_voltage;
497
498 /* uV */
499 ret = clamp_val(ret, 2400000, 3000000) - 2400000;
500 ret /= 200000;
501
502 ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
503 CFG_FLOAT_VOLTAGE_THRESHOLD_MASK,
504 ret << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT);
505 if (ret < 0)
506 return ret;
507 }
508
509 if (smb->max_charge_voltage) {
510 ret = smb->max_charge_voltage;
511
512 /* uV */
513 ret = clamp_val(ret, 3500000, 4500000) - 3500000;
514 ret /= 20000;
515
516 ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
517 CFG_FLOAT_VOLTAGE_FLOAT_MASK, ret);
518 if (ret < 0)
519 return ret;
520 }
521
522 return 0;
523 }
524
smb347_set_temp_limits(struct smb347_charger * smb)525 static int smb347_set_temp_limits(struct smb347_charger *smb)
526 {
527 unsigned int id = smb->id;
528 bool enable_therm_monitor = false;
529 int ret = 0;
530 int val;
531
532 if (smb->chip_temp_threshold) {
533 val = smb->chip_temp_threshold;
534
535 /* degree C */
536 val = clamp_val(val, 100, 130) - 100;
537 val /= 10;
538
539 ret = regmap_update_bits(smb->regmap, CFG_OTG,
540 CFG_OTG_TEMP_THRESHOLD_MASK,
541 val << CFG_OTG_TEMP_THRESHOLD_SHIFT);
542 if (ret < 0)
543 return ret;
544 }
545
546 if (smb->soft_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
547 val = smb->soft_cold_temp_limit;
548
549 val = clamp_val(val, 0, 15);
550 val /= 5;
551 /* this goes from higher to lower so invert the value */
552 val = ~val & 0x3;
553
554 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
555 CFG_TEMP_LIMIT_SOFT_COLD_MASK,
556 val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT);
557 if (ret < 0)
558 return ret;
559
560 enable_therm_monitor = true;
561 }
562
563 if (smb->soft_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
564 val = smb->soft_hot_temp_limit;
565
566 val = clamp_val(val, 40, 55) - 40;
567 val /= 5;
568
569 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
570 CFG_TEMP_LIMIT_SOFT_HOT_MASK,
571 val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT);
572 if (ret < 0)
573 return ret;
574
575 enable_therm_monitor = true;
576 }
577
578 if (smb->hard_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
579 val = smb->hard_cold_temp_limit;
580
581 val = clamp_val(val, -5, 10) + 5;
582 val /= 5;
583 /* this goes from higher to lower so invert the value */
584 val = ~val & 0x3;
585
586 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
587 CFG_TEMP_LIMIT_HARD_COLD_MASK,
588 val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT);
589 if (ret < 0)
590 return ret;
591
592 enable_therm_monitor = true;
593 }
594
595 if (smb->hard_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
596 val = smb->hard_hot_temp_limit;
597
598 val = clamp_val(val, 50, 65) - 50;
599 val /= 5;
600
601 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
602 CFG_TEMP_LIMIT_HARD_HOT_MASK,
603 val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT);
604 if (ret < 0)
605 return ret;
606
607 enable_therm_monitor = true;
608 }
609
610 /*
611 * If any of the temperature limits are set, we also enable the
612 * thermistor monitoring.
613 *
614 * When soft limits are hit, the device will start to compensate
615 * current and/or voltage depending on the configuration.
616 *
617 * When hard limit is hit, the device will suspend charging
618 * depending on the configuration.
619 */
620 if (enable_therm_monitor) {
621 ret = regmap_update_bits(smb->regmap, CFG_THERM,
622 CFG_THERM_MONITOR_DISABLED, 0);
623 if (ret < 0)
624 return ret;
625 }
626
627 if (smb->suspend_on_hard_temp_limit) {
628 ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
629 CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED, 0);
630 if (ret < 0)
631 return ret;
632 }
633
634 if (smb->soft_temp_limit_compensation !=
635 SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT) {
636 val = smb->soft_temp_limit_compensation & 0x3;
637
638 ret = regmap_update_bits(smb->regmap, CFG_THERM,
639 CFG_THERM_SOFT_HOT_COMPENSATION_MASK,
640 val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT);
641 if (ret < 0)
642 return ret;
643
644 ret = regmap_update_bits(smb->regmap, CFG_THERM,
645 CFG_THERM_SOFT_COLD_COMPENSATION_MASK,
646 val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT);
647 if (ret < 0)
648 return ret;
649 }
650
651 if (smb->charge_current_compensation) {
652 val = current_to_hw(ccc_tbl[id], ARRAY_SIZE(ccc_tbl[id]),
653 smb->charge_current_compensation);
654 if (val < 0)
655 return val;
656
657 ret = regmap_update_bits(smb->regmap, CFG_OTG,
658 CFG_OTG_CC_COMPENSATION_MASK,
659 (val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT);
660 if (ret < 0)
661 return ret;
662 }
663
664 return ret;
665 }
666
667 /*
668 * smb347_set_writable - enables/disables writing to non-volatile registers
669 * @smb: pointer to smb347 charger instance
670 *
671 * You can enable/disable writing to the non-volatile configuration
672 * registers by calling this function.
673 *
674 * Returns %0 on success and negative errno in case of failure.
675 */
smb347_set_writable(struct smb347_charger * smb,bool writable)676 static int smb347_set_writable(struct smb347_charger *smb, bool writable)
677 {
678 return regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE,
679 writable ? CMD_A_ALLOW_WRITE : 0);
680 }
681
smb347_hw_init(struct smb347_charger * smb)682 static int smb347_hw_init(struct smb347_charger *smb)
683 {
684 unsigned int val;
685 int ret;
686
687 ret = smb347_set_writable(smb, true);
688 if (ret < 0)
689 return ret;
690
691 /*
692 * Program the platform specific configuration values to the device
693 * first.
694 */
695 ret = smb347_set_charge_current(smb);
696 if (ret < 0)
697 goto fail;
698
699 ret = smb347_set_current_limits(smb);
700 if (ret < 0)
701 goto fail;
702
703 ret = smb347_set_voltage_limits(smb);
704 if (ret < 0)
705 goto fail;
706
707 ret = smb347_set_temp_limits(smb);
708 if (ret < 0)
709 goto fail;
710
711 /* If USB charging is disabled we put the USB in suspend mode */
712 if (!smb->use_usb) {
713 ret = regmap_update_bits(smb->regmap, CMD_A,
714 CMD_A_SUSPEND_ENABLED,
715 CMD_A_SUSPEND_ENABLED);
716 if (ret < 0)
717 goto fail;
718 }
719
720 /*
721 * If configured by platform data, we enable hardware Auto-OTG
722 * support for driving VBUS. Otherwise we disable it.
723 */
724 ret = regmap_update_bits(smb->regmap, CFG_OTHER, CFG_OTHER_RID_MASK,
725 smb->use_usb_otg ? CFG_OTHER_RID_ENABLED_AUTO_OTG : 0);
726 if (ret < 0)
727 goto fail;
728
729 /* Activate pin control, making it writable. */
730 switch (smb->enable_control) {
731 case SMB3XX_CHG_ENABLE_PIN_ACTIVE_LOW:
732 case SMB3XX_CHG_ENABLE_PIN_ACTIVE_HIGH:
733 ret = regmap_set_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL);
734 if (ret < 0)
735 goto fail;
736 }
737
738 /*
739 * Make the charging functionality controllable by a write to the
740 * command register unless pin control is specified in the platform
741 * data.
742 */
743 switch (smb->enable_control) {
744 case SMB3XX_CHG_ENABLE_PIN_ACTIVE_LOW:
745 val = CFG_PIN_EN_CTRL_ACTIVE_LOW;
746 break;
747 case SMB3XX_CHG_ENABLE_PIN_ACTIVE_HIGH:
748 val = CFG_PIN_EN_CTRL_ACTIVE_HIGH;
749 break;
750 default:
751 val = 0;
752 break;
753 }
754
755 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL_MASK,
756 val);
757 if (ret < 0)
758 goto fail;
759
760 /* Disable Automatic Power Source Detection (APSD) interrupt. */
761 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_APSD_IRQ, 0);
762 if (ret < 0)
763 goto fail;
764
765 ret = smb347_update_ps_status(smb);
766 if (ret < 0)
767 goto fail;
768
769 ret = smb347_start_stop_charging(smb);
770
771 fail:
772 smb347_set_writable(smb, false);
773 return ret;
774 }
775
smb347_interrupt(int irq,void * data)776 static irqreturn_t smb347_interrupt(int irq, void *data)
777 {
778 struct smb347_charger *smb = data;
779 unsigned int stat_c, irqstat_c, irqstat_d, irqstat_e;
780 bool handled = false;
781 int ret;
782
783 /* SMB347 it needs at least 20ms for setting IRQSTAT_E_*IN_UV_IRQ */
784 usleep_range(25000, 35000);
785
786 ret = regmap_read(smb->regmap, STAT_C, &stat_c);
787 if (ret < 0) {
788 dev_warn(smb->dev, "reading STAT_C failed\n");
789 return IRQ_NONE;
790 }
791
792 ret = regmap_read(smb->regmap, IRQSTAT_C, &irqstat_c);
793 if (ret < 0) {
794 dev_warn(smb->dev, "reading IRQSTAT_C failed\n");
795 return IRQ_NONE;
796 }
797
798 ret = regmap_read(smb->regmap, IRQSTAT_D, &irqstat_d);
799 if (ret < 0) {
800 dev_warn(smb->dev, "reading IRQSTAT_D failed\n");
801 return IRQ_NONE;
802 }
803
804 ret = regmap_read(smb->regmap, IRQSTAT_E, &irqstat_e);
805 if (ret < 0) {
806 dev_warn(smb->dev, "reading IRQSTAT_E failed\n");
807 return IRQ_NONE;
808 }
809
810 /*
811 * If we get charger error we report the error back to user.
812 * If the error is recovered charging will resume again.
813 */
814 if (stat_c & STAT_C_CHARGER_ERROR) {
815 dev_err(smb->dev, "charging stopped due to charger error\n");
816 if (smb->use_mains)
817 power_supply_changed(smb->mains);
818 if (smb->use_usb)
819 power_supply_changed(smb->usb);
820 handled = true;
821 }
822
823 /*
824 * If we reached the termination current the battery is charged and
825 * we can update the status now. Charging is automatically
826 * disabled by the hardware.
827 */
828 if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {
829 if (irqstat_c & IRQSTAT_C_TERMINATION_STAT) {
830 if (smb->use_mains)
831 power_supply_changed(smb->mains);
832 if (smb->use_usb)
833 power_supply_changed(smb->usb);
834 }
835 dev_dbg(smb->dev, "going to HW maintenance mode\n");
836 handled = true;
837 }
838
839 /*
840 * If we got a charger timeout INT that means the charge
841 * full is not detected with in charge timeout value.
842 */
843 if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_IRQ) {
844 dev_dbg(smb->dev, "total Charge Timeout INT received\n");
845
846 if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_STAT)
847 dev_warn(smb->dev, "charging stopped due to timeout\n");
848 if (smb->use_mains)
849 power_supply_changed(smb->mains);
850 if (smb->use_usb)
851 power_supply_changed(smb->usb);
852 handled = true;
853 }
854
855 /*
856 * If we got an under voltage interrupt it means that AC/USB input
857 * was connected or disconnected.
858 */
859 if (irqstat_e & (IRQSTAT_E_USBIN_UV_IRQ | IRQSTAT_E_DCIN_UV_IRQ)) {
860 if (smb347_update_ps_status(smb) > 0) {
861 smb347_start_stop_charging(smb);
862 if (smb->use_mains)
863 power_supply_changed(smb->mains);
864 if (smb->use_usb)
865 power_supply_changed(smb->usb);
866 }
867 handled = true;
868 }
869
870 return handled ? IRQ_HANDLED : IRQ_NONE;
871 }
872
smb347_irq_set(struct smb347_charger * smb,bool enable)873 static int smb347_irq_set(struct smb347_charger *smb, bool enable)
874 {
875 int ret;
876
877 if (smb->irq_unsupported)
878 return 0;
879
880 ret = smb347_set_writable(smb, true);
881 if (ret < 0)
882 return ret;
883
884 /*
885 * Enable/disable interrupts for:
886 * - under voltage
887 * - termination current reached
888 * - charger timeout
889 * - charger error
890 */
891 ret = regmap_update_bits(smb->regmap, CFG_FAULT_IRQ, 0xff,
892 enable ? CFG_FAULT_IRQ_DCIN_UV : 0);
893 if (ret < 0)
894 goto fail;
895
896 ret = regmap_update_bits(smb->regmap, CFG_STATUS_IRQ, 0xff,
897 enable ? (CFG_STATUS_IRQ_TERMINATION_OR_TAPER |
898 CFG_STATUS_IRQ_CHARGE_TIMEOUT) : 0);
899 if (ret < 0)
900 goto fail;
901
902 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CHARGER_ERROR,
903 enable ? CFG_PIN_EN_CHARGER_ERROR : 0);
904 fail:
905 smb347_set_writable(smb, false);
906 return ret;
907 }
908
smb347_irq_enable(struct smb347_charger * smb)909 static inline int smb347_irq_enable(struct smb347_charger *smb)
910 {
911 return smb347_irq_set(smb, true);
912 }
913
smb347_irq_disable(struct smb347_charger * smb)914 static inline int smb347_irq_disable(struct smb347_charger *smb)
915 {
916 return smb347_irq_set(smb, false);
917 }
918
smb347_irq_init(struct smb347_charger * smb,struct i2c_client * client)919 static int smb347_irq_init(struct smb347_charger *smb,
920 struct i2c_client *client)
921 {
922 int ret;
923
924 ret = devm_request_threaded_irq(smb->dev, client->irq, NULL,
925 smb347_interrupt, IRQF_ONESHOT,
926 client->name, smb);
927 if (ret < 0)
928 return ret;
929
930 ret = smb347_set_writable(smb, true);
931 if (ret < 0)
932 return ret;
933
934 /*
935 * Configure the STAT output to be suitable for interrupts: disable
936 * all other output (except interrupts) and make it active low.
937 */
938 ret = regmap_update_bits(smb->regmap, CFG_STAT,
939 CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED,
940 CFG_STAT_DISABLED);
941
942 smb347_set_writable(smb, false);
943
944 return ret;
945 }
946
947 /*
948 * Returns the constant charge current programmed
949 * into the charger in uA.
950 */
get_const_charge_current(struct smb347_charger * smb)951 static int get_const_charge_current(struct smb347_charger *smb)
952 {
953 unsigned int id = smb->id;
954 int ret, intval;
955 unsigned int v;
956
957 if (!smb347_is_ps_online(smb))
958 return -ENODATA;
959
960 ret = regmap_read(smb->regmap, STAT_B, &v);
961 if (ret < 0)
962 return ret;
963
964 /*
965 * The current value is composition of FCC and PCC values
966 * and we can detect which table to use from bit 5.
967 */
968 if (v & 0x20) {
969 intval = hw_to_current(fcc_tbl[id],
970 ARRAY_SIZE(fcc_tbl[id]), v & 7);
971 } else {
972 v >>= 3;
973 intval = hw_to_current(pcc_tbl[id],
974 ARRAY_SIZE(pcc_tbl[id]), v & 7);
975 }
976
977 return intval;
978 }
979
980 /*
981 * Returns the constant charge voltage programmed
982 * into the charger in uV.
983 */
get_const_charge_voltage(struct smb347_charger * smb)984 static int get_const_charge_voltage(struct smb347_charger *smb)
985 {
986 int ret, intval;
987 unsigned int v;
988
989 if (!smb347_is_ps_online(smb))
990 return -ENODATA;
991
992 ret = regmap_read(smb->regmap, STAT_A, &v);
993 if (ret < 0)
994 return ret;
995
996 v &= STAT_A_FLOAT_VOLTAGE_MASK;
997 if (v > 0x3d)
998 v = 0x3d;
999
1000 intval = 3500000 + v * 20000;
1001
1002 return intval;
1003 }
1004
smb347_get_charging_status(struct smb347_charger * smb,struct power_supply * psy)1005 static int smb347_get_charging_status(struct smb347_charger *smb,
1006 struct power_supply *psy)
1007 {
1008 int ret, status;
1009 unsigned int val;
1010
1011 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
1012 if (!smb->usb_online)
1013 return POWER_SUPPLY_STATUS_DISCHARGING;
1014 } else {
1015 if (!smb->mains_online)
1016 return POWER_SUPPLY_STATUS_DISCHARGING;
1017 }
1018
1019 ret = regmap_read(smb->regmap, STAT_C, &val);
1020 if (ret < 0)
1021 return ret;
1022
1023 if ((val & STAT_C_CHARGER_ERROR) ||
1024 (val & STAT_C_HOLDOFF_STAT)) {
1025 /*
1026 * set to NOT CHARGING upon charger error
1027 * or charging has stopped.
1028 */
1029 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1030 } else {
1031 if ((val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT) {
1032 /*
1033 * set to charging if battery is in pre-charge,
1034 * fast charge or taper charging mode.
1035 */
1036 status = POWER_SUPPLY_STATUS_CHARGING;
1037 } else if (val & STAT_C_CHG_TERM) {
1038 /*
1039 * set the status to FULL if battery is not in pre
1040 * charge, fast charge or taper charging mode AND
1041 * charging is terminated at least once.
1042 */
1043 status = POWER_SUPPLY_STATUS_FULL;
1044 } else {
1045 /*
1046 * in this case no charger error or termination
1047 * occured but charging is not in progress!!!
1048 */
1049 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1050 }
1051 }
1052
1053 return status;
1054 }
1055
smb347_get_property_locked(struct power_supply * psy,enum power_supply_property prop,union power_supply_propval * val)1056 static int smb347_get_property_locked(struct power_supply *psy,
1057 enum power_supply_property prop,
1058 union power_supply_propval *val)
1059 {
1060 struct smb347_charger *smb = power_supply_get_drvdata(psy);
1061 int ret;
1062
1063 switch (prop) {
1064 case POWER_SUPPLY_PROP_STATUS:
1065 ret = smb347_get_charging_status(smb, psy);
1066 if (ret < 0)
1067 return ret;
1068 val->intval = ret;
1069 break;
1070
1071 case POWER_SUPPLY_PROP_CHARGE_TYPE:
1072 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
1073 if (!smb->usb_online)
1074 return -ENODATA;
1075 } else {
1076 if (!smb->mains_online)
1077 return -ENODATA;
1078 }
1079
1080 /*
1081 * We handle trickle and pre-charging the same, and taper
1082 * and none the same.
1083 */
1084 switch (smb347_charging_status(smb)) {
1085 case 1:
1086 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
1087 break;
1088 case 2:
1089 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
1090 break;
1091 default:
1092 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
1093 break;
1094 }
1095 break;
1096
1097 case POWER_SUPPLY_PROP_ONLINE:
1098 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
1099 val->intval = smb->usb_online;
1100 else
1101 val->intval = smb->mains_online;
1102 break;
1103
1104 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
1105 ret = get_const_charge_voltage(smb);
1106 if (ret < 0)
1107 return ret;
1108 val->intval = ret;
1109 break;
1110
1111 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
1112 ret = get_const_charge_current(smb);
1113 if (ret < 0)
1114 return ret;
1115 val->intval = ret;
1116 break;
1117
1118 default:
1119 return -EINVAL;
1120 }
1121
1122 return 0;
1123 }
1124
smb347_get_property(struct power_supply * psy,enum power_supply_property prop,union power_supply_propval * val)1125 static int smb347_get_property(struct power_supply *psy,
1126 enum power_supply_property prop,
1127 union power_supply_propval *val)
1128 {
1129 struct smb347_charger *smb = power_supply_get_drvdata(psy);
1130 struct i2c_client *client = to_i2c_client(smb->dev);
1131 int ret;
1132
1133 disable_irq(client->irq);
1134 ret = smb347_get_property_locked(psy, prop, val);
1135 enable_irq(client->irq);
1136
1137 return ret;
1138 }
1139
1140 static enum power_supply_property smb347_properties[] = {
1141 POWER_SUPPLY_PROP_STATUS,
1142 POWER_SUPPLY_PROP_CHARGE_TYPE,
1143 POWER_SUPPLY_PROP_ONLINE,
1144 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
1145 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
1146 };
1147
smb347_volatile_reg(struct device * dev,unsigned int reg)1148 static bool smb347_volatile_reg(struct device *dev, unsigned int reg)
1149 {
1150 switch (reg) {
1151 case IRQSTAT_A:
1152 case IRQSTAT_C:
1153 case IRQSTAT_D:
1154 case IRQSTAT_E:
1155 case IRQSTAT_F:
1156 case STAT_A:
1157 case STAT_B:
1158 case STAT_C:
1159 case STAT_E:
1160 return true;
1161 }
1162
1163 return false;
1164 }
1165
smb347_readable_reg(struct device * dev,unsigned int reg)1166 static bool smb347_readable_reg(struct device *dev, unsigned int reg)
1167 {
1168 switch (reg) {
1169 case CFG_CHARGE_CURRENT:
1170 case CFG_CURRENT_LIMIT:
1171 case CFG_FLOAT_VOLTAGE:
1172 case CFG_STAT:
1173 case CFG_PIN:
1174 case CFG_THERM:
1175 case CFG_SYSOK:
1176 case CFG_OTHER:
1177 case CFG_OTG:
1178 case CFG_TEMP_LIMIT:
1179 case CFG_FAULT_IRQ:
1180 case CFG_STATUS_IRQ:
1181 case CFG_ADDRESS:
1182 case CMD_A:
1183 case CMD_B:
1184 case CMD_C:
1185 return true;
1186 }
1187
1188 return smb347_volatile_reg(dev, reg);
1189 }
1190
smb347_dt_parse_dev_info(struct smb347_charger * smb)1191 static void smb347_dt_parse_dev_info(struct smb347_charger *smb)
1192 {
1193 struct device *dev = smb->dev;
1194
1195 smb->soft_temp_limit_compensation =
1196 SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT;
1197 /*
1198 * These properties come from the battery info, still we need to
1199 * pre-initialize the values. See smb347_get_battery_info() below.
1200 */
1201 smb->soft_cold_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
1202 smb->hard_cold_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
1203 smb->soft_hot_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
1204 smb->hard_hot_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
1205
1206 /* Charging constraints */
1207 device_property_read_u32(dev, "summit,fast-voltage-threshold-microvolt",
1208 &smb->pre_to_fast_voltage);
1209 device_property_read_u32(dev, "summit,mains-current-limit-microamp",
1210 &smb->mains_current_limit);
1211 device_property_read_u32(dev, "summit,usb-current-limit-microamp",
1212 &smb->usb_hc_current_limit);
1213
1214 /* For thermometer monitoring */
1215 device_property_read_u32(dev, "summit,chip-temperature-threshold-celsius",
1216 &smb->chip_temp_threshold);
1217 device_property_read_u32(dev, "summit,soft-compensation-method",
1218 &smb->soft_temp_limit_compensation);
1219 device_property_read_u32(dev, "summit,charge-current-compensation-microamp",
1220 &smb->charge_current_compensation);
1221
1222 /* Supported charging mode */
1223 smb->use_mains = device_property_read_bool(dev, "summit,enable-mains-charging");
1224 smb->use_usb = device_property_read_bool(dev, "summit,enable-usb-charging");
1225 smb->use_usb_otg = device_property_read_bool(dev, "summit,enable-otg-charging");
1226
1227 /* Select charging control */
1228 device_property_read_u32(dev, "summit,enable-charge-control",
1229 &smb->enable_control);
1230 }
1231
smb347_get_battery_info(struct smb347_charger * smb)1232 static int smb347_get_battery_info(struct smb347_charger *smb)
1233 {
1234 struct power_supply_battery_info info = {};
1235 struct power_supply *supply;
1236 int err;
1237
1238 if (smb->mains)
1239 supply = smb->mains;
1240 else
1241 supply = smb->usb;
1242
1243 err = power_supply_get_battery_info(supply, &info);
1244 if (err == -ENXIO || err == -ENODEV)
1245 return 0;
1246 if (err)
1247 return err;
1248
1249 if (info.constant_charge_current_max_ua != -EINVAL)
1250 smb->max_charge_current = info.constant_charge_current_max_ua;
1251
1252 if (info.constant_charge_voltage_max_uv != -EINVAL)
1253 smb->max_charge_voltage = info.constant_charge_voltage_max_uv;
1254
1255 if (info.precharge_current_ua != -EINVAL)
1256 smb->pre_charge_current = info.precharge_current_ua;
1257
1258 if (info.charge_term_current_ua != -EINVAL)
1259 smb->termination_current = info.charge_term_current_ua;
1260
1261 if (info.temp_alert_min != INT_MIN)
1262 smb->soft_cold_temp_limit = info.temp_alert_min;
1263
1264 if (info.temp_alert_max != INT_MAX)
1265 smb->soft_hot_temp_limit = info.temp_alert_max;
1266
1267 if (info.temp_min != INT_MIN)
1268 smb->hard_cold_temp_limit = info.temp_min;
1269
1270 if (info.temp_max != INT_MAX)
1271 smb->hard_hot_temp_limit = info.temp_max;
1272
1273 /* Suspend when battery temperature is outside hard limits */
1274 if (smb->hard_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT ||
1275 smb->hard_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT)
1276 smb->suspend_on_hard_temp_limit = true;
1277
1278 return 0;
1279 }
1280
1281 static const struct regmap_config smb347_regmap = {
1282 .reg_bits = 8,
1283 .val_bits = 8,
1284 .max_register = SMB347_MAX_REGISTER,
1285 .volatile_reg = smb347_volatile_reg,
1286 .readable_reg = smb347_readable_reg,
1287 };
1288
1289 static const struct power_supply_desc smb347_mains_desc = {
1290 .name = "smb347-mains",
1291 .type = POWER_SUPPLY_TYPE_MAINS,
1292 .get_property = smb347_get_property,
1293 .properties = smb347_properties,
1294 .num_properties = ARRAY_SIZE(smb347_properties),
1295 };
1296
1297 static const struct power_supply_desc smb347_usb_desc = {
1298 .name = "smb347-usb",
1299 .type = POWER_SUPPLY_TYPE_USB,
1300 .get_property = smb347_get_property,
1301 .properties = smb347_properties,
1302 .num_properties = ARRAY_SIZE(smb347_properties),
1303 };
1304
smb347_probe(struct i2c_client * client,const struct i2c_device_id * id)1305 static int smb347_probe(struct i2c_client *client,
1306 const struct i2c_device_id *id)
1307 {
1308 struct power_supply_config mains_usb_cfg = {};
1309 struct device *dev = &client->dev;
1310 struct smb347_charger *smb;
1311 int ret;
1312
1313 smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);
1314 if (!smb)
1315 return -ENOMEM;
1316 smb->dev = &client->dev;
1317 smb->id = id->driver_data;
1318 i2c_set_clientdata(client, smb);
1319
1320 smb347_dt_parse_dev_info(smb);
1321 if (!smb->use_mains && !smb->use_usb)
1322 return -EINVAL;
1323
1324 smb->regmap = devm_regmap_init_i2c(client, &smb347_regmap);
1325 if (IS_ERR(smb->regmap))
1326 return PTR_ERR(smb->regmap);
1327
1328 mains_usb_cfg.drv_data = smb;
1329 mains_usb_cfg.of_node = dev->of_node;
1330 if (smb->use_mains) {
1331 smb->mains = devm_power_supply_register(dev, &smb347_mains_desc,
1332 &mains_usb_cfg);
1333 if (IS_ERR(smb->mains))
1334 return PTR_ERR(smb->mains);
1335 }
1336
1337 if (smb->use_usb) {
1338 smb->usb = devm_power_supply_register(dev, &smb347_usb_desc,
1339 &mains_usb_cfg);
1340 if (IS_ERR(smb->usb))
1341 return PTR_ERR(smb->usb);
1342 }
1343
1344 ret = smb347_get_battery_info(smb);
1345 if (ret)
1346 return ret;
1347
1348 ret = smb347_hw_init(smb);
1349 if (ret < 0)
1350 return ret;
1351
1352 /*
1353 * Interrupt pin is optional. If it is connected, we setup the
1354 * interrupt support here.
1355 */
1356 if (client->irq) {
1357 ret = smb347_irq_init(smb, client);
1358 if (ret < 0) {
1359 dev_warn(dev, "failed to initialize IRQ: %d\n", ret);
1360 dev_warn(dev, "disabling IRQ support\n");
1361 smb->irq_unsupported = true;
1362 } else {
1363 smb347_irq_enable(smb);
1364 }
1365 }
1366
1367 return 0;
1368 }
1369
smb347_remove(struct i2c_client * client)1370 static int smb347_remove(struct i2c_client *client)
1371 {
1372 struct smb347_charger *smb = i2c_get_clientdata(client);
1373
1374 smb347_irq_disable(smb);
1375
1376 return 0;
1377 }
1378
1379 static const struct i2c_device_id smb347_id[] = {
1380 { "smb345", SMB345 },
1381 { "smb347", SMB347 },
1382 { "smb358", SMB358 },
1383 { },
1384 };
1385 MODULE_DEVICE_TABLE(i2c, smb347_id);
1386
1387 static const struct of_device_id smb3xx_of_match[] = {
1388 { .compatible = "summit,smb345" },
1389 { .compatible = "summit,smb347" },
1390 { .compatible = "summit,smb358" },
1391 { },
1392 };
1393 MODULE_DEVICE_TABLE(of, smb3xx_of_match);
1394
1395 static struct i2c_driver smb347_driver = {
1396 .driver = {
1397 .name = "smb347",
1398 .of_match_table = smb3xx_of_match,
1399 },
1400 .probe = smb347_probe,
1401 .remove = smb347_remove,
1402 .id_table = smb347_id,
1403 };
1404
1405 module_i2c_driver(smb347_driver);
1406
1407 MODULE_AUTHOR("Bruce E. Robertson <bruce.e.robertson@intel.com>");
1408 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1409 MODULE_DESCRIPTION("SMB347 battery charger driver");
1410 MODULE_LICENSE("GPL");
1411