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_THERM 0x07
60 #define CFG_THERM_SOFT_HOT_COMPENSATION_MASK 0x03
61 #define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT 0
62 #define CFG_THERM_SOFT_COLD_COMPENSATION_MASK 0x0c
63 #define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT 2
64 #define CFG_THERM_MONITOR_DISABLED BIT(4)
65 #define CFG_SYSOK 0x08
66 #define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED BIT(2)
67 #define CFG_OTHER 0x09
68 #define CFG_OTHER_RID_MASK 0xc0
69 #define CFG_OTHER_RID_ENABLED_AUTO_OTG 0xc0
70 #define CFG_OTG 0x0a
71 #define CFG_OTG_TEMP_THRESHOLD_MASK 0x30
72 #define CFG_OTG_TEMP_THRESHOLD_SHIFT 4
73 #define CFG_OTG_CC_COMPENSATION_MASK 0xc0
74 #define CFG_OTG_CC_COMPENSATION_SHIFT 6
75 #define CFG_TEMP_LIMIT 0x0b
76 #define CFG_TEMP_LIMIT_SOFT_HOT_MASK 0x03
77 #define CFG_TEMP_LIMIT_SOFT_HOT_SHIFT 0
78 #define CFG_TEMP_LIMIT_SOFT_COLD_MASK 0x0c
79 #define CFG_TEMP_LIMIT_SOFT_COLD_SHIFT 2
80 #define CFG_TEMP_LIMIT_HARD_HOT_MASK 0x30
81 #define CFG_TEMP_LIMIT_HARD_HOT_SHIFT 4
82 #define CFG_TEMP_LIMIT_HARD_COLD_MASK 0xc0
83 #define CFG_TEMP_LIMIT_HARD_COLD_SHIFT 6
84 #define CFG_FAULT_IRQ 0x0c
85 #define CFG_FAULT_IRQ_DCIN_UV BIT(2)
86 #define CFG_STATUS_IRQ 0x0d
87 #define CFG_STATUS_IRQ_TERMINATION_OR_TAPER BIT(4)
88 #define CFG_STATUS_IRQ_CHARGE_TIMEOUT BIT(7)
89 #define CFG_ADDRESS 0x0e
90
91 /* Command registers */
92 #define CMD_A 0x30
93 #define CMD_A_CHG_ENABLED BIT(1)
94 #define CMD_A_SUSPEND_ENABLED BIT(2)
95 #define CMD_A_ALLOW_WRITE BIT(7)
96 #define CMD_B 0x31
97 #define CMD_C 0x33
98
99 /* Interrupt Status registers */
100 #define IRQSTAT_A 0x35
101 #define IRQSTAT_C 0x37
102 #define IRQSTAT_C_TERMINATION_STAT BIT(0)
103 #define IRQSTAT_C_TERMINATION_IRQ BIT(1)
104 #define IRQSTAT_C_TAPER_IRQ BIT(3)
105 #define IRQSTAT_D 0x38
106 #define IRQSTAT_D_CHARGE_TIMEOUT_STAT BIT(2)
107 #define IRQSTAT_D_CHARGE_TIMEOUT_IRQ BIT(3)
108 #define IRQSTAT_E 0x39
109 #define IRQSTAT_E_USBIN_UV_STAT BIT(0)
110 #define IRQSTAT_E_USBIN_UV_IRQ BIT(1)
111 #define IRQSTAT_E_DCIN_UV_STAT BIT(4)
112 #define IRQSTAT_E_DCIN_UV_IRQ BIT(5)
113 #define IRQSTAT_F 0x3a
114
115 /* Status registers */
116 #define STAT_A 0x3b
117 #define STAT_A_FLOAT_VOLTAGE_MASK 0x3f
118 #define STAT_B 0x3c
119 #define STAT_C 0x3d
120 #define STAT_C_CHG_ENABLED BIT(0)
121 #define STAT_C_HOLDOFF_STAT BIT(3)
122 #define STAT_C_CHG_MASK 0x06
123 #define STAT_C_CHG_SHIFT 1
124 #define STAT_C_CHG_TERM BIT(5)
125 #define STAT_C_CHARGER_ERROR BIT(6)
126 #define STAT_E 0x3f
127
128 #define SMB347_MAX_REGISTER 0x3f
129
130 /**
131 * struct smb347_charger - smb347 charger instance
132 * @dev: pointer to device
133 * @regmap: pointer to driver regmap
134 * @mains: power_supply instance for AC/DC power
135 * @usb: power_supply instance for USB power
136 * @id: SMB charger ID
137 * @mains_online: is AC/DC input connected
138 * @usb_online: is USB input connected
139 * @charging_enabled: is charging enabled
140 * @irq_unsupported: is interrupt unsupported by SMB hardware
141 * @max_charge_current: maximum current (in uA) the battery can be charged
142 * @max_charge_voltage: maximum voltage (in uV) the battery can be charged
143 * @pre_charge_current: current (in uA) to use in pre-charging phase
144 * @termination_current: current (in uA) used to determine when the
145 * charging cycle terminates
146 * @pre_to_fast_voltage: voltage (in uV) treshold used for transitioning to
147 * pre-charge to fast charge mode
148 * @mains_current_limit: maximum input current drawn from AC/DC input (in uA)
149 * @usb_hc_current_limit: maximum input high current (in uA) drawn from USB
150 * input
151 * @chip_temp_threshold: die temperature where device starts limiting charge
152 * current [%100 - %130] (in degree C)
153 * @soft_cold_temp_limit: soft cold temperature limit [%0 - %15] (in degree C),
154 * granularity is 5 deg C.
155 * @soft_hot_temp_limit: soft hot temperature limit [%40 - %55] (in degree C),
156 * granularity is 5 deg C.
157 * @hard_cold_temp_limit: hard cold temperature limit [%-5 - %10] (in degree C),
158 * granularity is 5 deg C.
159 * @hard_hot_temp_limit: hard hot temperature limit [%50 - %65] (in degree C),
160 * granularity is 5 deg C.
161 * @suspend_on_hard_temp_limit: suspend charging when hard limit is hit
162 * @soft_temp_limit_compensation: compensation method when soft temperature
163 * limit is hit
164 * @charge_current_compensation: current (in uA) for charging compensation
165 * current when temperature hits soft limits
166 * @use_mains: AC/DC input can be used
167 * @use_usb: USB input can be used
168 * @use_usb_otg: USB OTG output can be used (not implemented yet)
169 * @enable_control: how charging enable/disable is controlled
170 * (driver/pin controls)
171 *
172 * @use_main, @use_usb, and @use_usb_otg are means to enable/disable
173 * hardware support for these. This is useful when we want to have for
174 * example OTG charging controlled via OTG transceiver driver and not by
175 * the SMB347 hardware.
176 *
177 * Hard and soft temperature limit values are given as described in the
178 * device data sheet and assuming NTC beta value is %3750. Even if this is
179 * not the case, these values should be used. They can be mapped to the
180 * corresponding NTC beta values with the help of table %2 in the data
181 * sheet. So for example if NTC beta is %3375 and we want to program hard
182 * hot limit to be %53 deg C, @hard_hot_temp_limit should be set to %50.
183 *
184 * If zero value is given in any of the current and voltage values, the
185 * factory programmed default will be used. For soft/hard temperature
186 * values, pass in %SMB3XX_TEMP_USE_DEFAULT instead.
187 */
188 struct smb347_charger {
189 struct device *dev;
190 struct regmap *regmap;
191 struct power_supply *mains;
192 struct power_supply *usb;
193 unsigned int id;
194 bool mains_online;
195 bool usb_online;
196 bool charging_enabled;
197 bool irq_unsupported;
198
199 unsigned int max_charge_current;
200 unsigned int max_charge_voltage;
201 unsigned int pre_charge_current;
202 unsigned int termination_current;
203 unsigned int pre_to_fast_voltage;
204 unsigned int mains_current_limit;
205 unsigned int usb_hc_current_limit;
206 unsigned int chip_temp_threshold;
207 int soft_cold_temp_limit;
208 int soft_hot_temp_limit;
209 int hard_cold_temp_limit;
210 int hard_hot_temp_limit;
211 bool suspend_on_hard_temp_limit;
212 unsigned int soft_temp_limit_compensation;
213 unsigned int charge_current_compensation;
214 bool use_mains;
215 bool use_usb;
216 bool use_usb_otg;
217 unsigned int enable_control;
218 };
219
220 enum smb_charger_chipid {
221 SMB345,
222 SMB347,
223 SMB358,
224 NUM_CHIP_TYPES,
225 };
226
227 /* Fast charge current in uA */
228 static const unsigned int fcc_tbl[NUM_CHIP_TYPES][8] = {
229 [SMB345] = { 200000, 450000, 600000, 900000,
230 1300000, 1500000, 1800000, 2000000 },
231 [SMB347] = { 700000, 900000, 1200000, 1500000,
232 1800000, 2000000, 2200000, 2500000 },
233 [SMB358] = { 200000, 450000, 600000, 900000,
234 1300000, 1500000, 1800000, 2000000 },
235 };
236 /* Pre-charge current in uA */
237 static const unsigned int pcc_tbl[NUM_CHIP_TYPES][4] = {
238 [SMB345] = { 150000, 250000, 350000, 450000 },
239 [SMB347] = { 100000, 150000, 200000, 250000 },
240 [SMB358] = { 150000, 250000, 350000, 450000 },
241 };
242
243 /* Termination current in uA */
244 static const unsigned int tc_tbl[NUM_CHIP_TYPES][8] = {
245 [SMB345] = { 30000, 40000, 60000, 80000,
246 100000, 125000, 150000, 200000 },
247 [SMB347] = { 37500, 50000, 100000, 150000,
248 200000, 250000, 500000, 600000 },
249 [SMB358] = { 30000, 40000, 60000, 80000,
250 100000, 125000, 150000, 200000 },
251 };
252
253 /* Input current limit in uA */
254 static const unsigned int icl_tbl[NUM_CHIP_TYPES][10] = {
255 [SMB345] = { 300000, 500000, 700000, 1000000, 1500000,
256 1800000, 2000000, 2000000, 2000000, 2000000 },
257 [SMB347] = { 300000, 500000, 700000, 900000, 1200000,
258 1500000, 1800000, 2000000, 2200000, 2500000 },
259 [SMB358] = { 300000, 500000, 700000, 1000000, 1500000,
260 1800000, 2000000, 2000000, 2000000, 2000000 },
261 };
262
263 /* Charge current compensation in uA */
264 static const unsigned int ccc_tbl[NUM_CHIP_TYPES][4] = {
265 [SMB345] = { 200000, 450000, 600000, 900000 },
266 [SMB347] = { 250000, 700000, 900000, 1200000 },
267 [SMB358] = { 200000, 450000, 600000, 900000 },
268 };
269
270 /* Convert register value to current using lookup table */
hw_to_current(const unsigned int * tbl,size_t size,unsigned int val)271 static int hw_to_current(const unsigned int *tbl, size_t size, unsigned int val)
272 {
273 if (val >= size)
274 return -EINVAL;
275 return tbl[val];
276 }
277
278 /* Convert current to register value using lookup table */
current_to_hw(const unsigned int * tbl,size_t size,unsigned int val)279 static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)
280 {
281 size_t i;
282
283 for (i = 0; i < size; i++)
284 if (val < tbl[i])
285 break;
286 return i > 0 ? i - 1 : -EINVAL;
287 }
288
289 /**
290 * smb347_update_ps_status - refreshes the power source status
291 * @smb: pointer to smb347 charger instance
292 *
293 * Function checks whether any power source is connected to the charger and
294 * updates internal state accordingly. If there is a change to previous state
295 * function returns %1, otherwise %0 and negative errno in case of errror.
296 */
smb347_update_ps_status(struct smb347_charger * smb)297 static int smb347_update_ps_status(struct smb347_charger *smb)
298 {
299 bool usb = false;
300 bool dc = false;
301 unsigned int val;
302 int ret;
303
304 ret = regmap_read(smb->regmap, IRQSTAT_E, &val);
305 if (ret < 0)
306 return ret;
307
308 /*
309 * Dc and usb are set depending on whether they are enabled in
310 * platform data _and_ whether corresponding undervoltage is set.
311 */
312 if (smb->use_mains)
313 dc = !(val & IRQSTAT_E_DCIN_UV_STAT);
314 if (smb->use_usb)
315 usb = !(val & IRQSTAT_E_USBIN_UV_STAT);
316
317 ret = smb->mains_online != dc || smb->usb_online != usb;
318 smb->mains_online = dc;
319 smb->usb_online = usb;
320
321 return ret;
322 }
323
324 /*
325 * smb347_is_ps_online - returns whether input power source is connected
326 * @smb: pointer to smb347 charger instance
327 *
328 * Returns %true if input power source is connected. Note that this is
329 * dependent on what platform has configured for usable power sources. For
330 * example if USB is disabled, this will return %false even if the USB cable
331 * is connected.
332 */
smb347_is_ps_online(struct smb347_charger * smb)333 static bool smb347_is_ps_online(struct smb347_charger *smb)
334 {
335 return smb->usb_online || smb->mains_online;
336 }
337
338 /**
339 * smb347_charging_status - returns status of charging
340 * @smb: pointer to smb347 charger instance
341 *
342 * Function returns charging status. %0 means no charging is in progress,
343 * %1 means pre-charging, %2 fast-charging and %3 taper-charging.
344 */
smb347_charging_status(struct smb347_charger * smb)345 static int smb347_charging_status(struct smb347_charger *smb)
346 {
347 unsigned int val;
348 int ret;
349
350 if (!smb347_is_ps_online(smb))
351 return 0;
352
353 ret = regmap_read(smb->regmap, STAT_C, &val);
354 if (ret < 0)
355 return 0;
356
357 return (val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT;
358 }
359
smb347_charging_set(struct smb347_charger * smb,bool enable)360 static int smb347_charging_set(struct smb347_charger *smb, bool enable)
361 {
362 int ret = 0;
363
364 if (smb->enable_control != SMB3XX_CHG_ENABLE_SW) {
365 dev_dbg(smb->dev, "charging enable/disable in SW disabled\n");
366 return 0;
367 }
368
369 if (smb->charging_enabled != enable) {
370 ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED,
371 enable ? CMD_A_CHG_ENABLED : 0);
372 if (!ret)
373 smb->charging_enabled = enable;
374 }
375
376 return ret;
377 }
378
smb347_charging_enable(struct smb347_charger * smb)379 static inline int smb347_charging_enable(struct smb347_charger *smb)
380 {
381 return smb347_charging_set(smb, true);
382 }
383
smb347_charging_disable(struct smb347_charger * smb)384 static inline int smb347_charging_disable(struct smb347_charger *smb)
385 {
386 return smb347_charging_set(smb, false);
387 }
388
smb347_start_stop_charging(struct smb347_charger * smb)389 static int smb347_start_stop_charging(struct smb347_charger *smb)
390 {
391 int ret;
392
393 /*
394 * Depending on whether valid power source is connected or not, we
395 * disable or enable the charging. We do it manually because it
396 * depends on how the platform has configured the valid inputs.
397 */
398 if (smb347_is_ps_online(smb)) {
399 ret = smb347_charging_enable(smb);
400 if (ret < 0)
401 dev_err(smb->dev, "failed to enable charging\n");
402 } else {
403 ret = smb347_charging_disable(smb);
404 if (ret < 0)
405 dev_err(smb->dev, "failed to disable charging\n");
406 }
407
408 return ret;
409 }
410
smb347_set_charge_current(struct smb347_charger * smb)411 static int smb347_set_charge_current(struct smb347_charger *smb)
412 {
413 unsigned int id = smb->id;
414 int ret;
415
416 if (smb->max_charge_current) {
417 ret = current_to_hw(fcc_tbl[id], ARRAY_SIZE(fcc_tbl[id]),
418 smb->max_charge_current);
419 if (ret < 0)
420 return ret;
421
422 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
423 CFG_CHARGE_CURRENT_FCC_MASK,
424 ret << CFG_CHARGE_CURRENT_FCC_SHIFT);
425 if (ret < 0)
426 return ret;
427 }
428
429 if (smb->pre_charge_current) {
430 ret = current_to_hw(pcc_tbl[id], ARRAY_SIZE(pcc_tbl[id]),
431 smb->pre_charge_current);
432 if (ret < 0)
433 return ret;
434
435 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
436 CFG_CHARGE_CURRENT_PCC_MASK,
437 ret << CFG_CHARGE_CURRENT_PCC_SHIFT);
438 if (ret < 0)
439 return ret;
440 }
441
442 if (smb->termination_current) {
443 ret = current_to_hw(tc_tbl[id], ARRAY_SIZE(tc_tbl[id]),
444 smb->termination_current);
445 if (ret < 0)
446 return ret;
447
448 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
449 CFG_CHARGE_CURRENT_TC_MASK, ret);
450 if (ret < 0)
451 return ret;
452 }
453
454 return 0;
455 }
456
smb347_set_current_limits(struct smb347_charger * smb)457 static int smb347_set_current_limits(struct smb347_charger *smb)
458 {
459 unsigned int id = smb->id;
460 int ret;
461
462 if (smb->mains_current_limit) {
463 ret = current_to_hw(icl_tbl[id], ARRAY_SIZE(icl_tbl[id]),
464 smb->mains_current_limit);
465 if (ret < 0)
466 return ret;
467
468 ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
469 CFG_CURRENT_LIMIT_DC_MASK,
470 ret << CFG_CURRENT_LIMIT_DC_SHIFT);
471 if (ret < 0)
472 return ret;
473 }
474
475 if (smb->usb_hc_current_limit) {
476 ret = current_to_hw(icl_tbl[id], ARRAY_SIZE(icl_tbl[id]),
477 smb->usb_hc_current_limit);
478 if (ret < 0)
479 return ret;
480
481 ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
482 CFG_CURRENT_LIMIT_USB_MASK, ret);
483 if (ret < 0)
484 return ret;
485 }
486
487 return 0;
488 }
489
smb347_set_voltage_limits(struct smb347_charger * smb)490 static int smb347_set_voltage_limits(struct smb347_charger *smb)
491 {
492 int ret;
493
494 if (smb->pre_to_fast_voltage) {
495 ret = smb->pre_to_fast_voltage;
496
497 /* uV */
498 ret = clamp_val(ret, 2400000, 3000000) - 2400000;
499 ret /= 200000;
500
501 ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
502 CFG_FLOAT_VOLTAGE_THRESHOLD_MASK,
503 ret << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT);
504 if (ret < 0)
505 return ret;
506 }
507
508 if (smb->max_charge_voltage) {
509 ret = smb->max_charge_voltage;
510
511 /* uV */
512 ret = clamp_val(ret, 3500000, 4500000) - 3500000;
513 ret /= 20000;
514
515 ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
516 CFG_FLOAT_VOLTAGE_FLOAT_MASK, ret);
517 if (ret < 0)
518 return ret;
519 }
520
521 return 0;
522 }
523
smb347_set_temp_limits(struct smb347_charger * smb)524 static int smb347_set_temp_limits(struct smb347_charger *smb)
525 {
526 unsigned int id = smb->id;
527 bool enable_therm_monitor = false;
528 int ret = 0;
529 int val;
530
531 if (smb->chip_temp_threshold) {
532 val = smb->chip_temp_threshold;
533
534 /* degree C */
535 val = clamp_val(val, 100, 130) - 100;
536 val /= 10;
537
538 ret = regmap_update_bits(smb->regmap, CFG_OTG,
539 CFG_OTG_TEMP_THRESHOLD_MASK,
540 val << CFG_OTG_TEMP_THRESHOLD_SHIFT);
541 if (ret < 0)
542 return ret;
543 }
544
545 if (smb->soft_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
546 val = smb->soft_cold_temp_limit;
547
548 val = clamp_val(val, 0, 15);
549 val /= 5;
550 /* this goes from higher to lower so invert the value */
551 val = ~val & 0x3;
552
553 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
554 CFG_TEMP_LIMIT_SOFT_COLD_MASK,
555 val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT);
556 if (ret < 0)
557 return ret;
558
559 enable_therm_monitor = true;
560 }
561
562 if (smb->soft_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
563 val = smb->soft_hot_temp_limit;
564
565 val = clamp_val(val, 40, 55) - 40;
566 val /= 5;
567
568 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
569 CFG_TEMP_LIMIT_SOFT_HOT_MASK,
570 val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT);
571 if (ret < 0)
572 return ret;
573
574 enable_therm_monitor = true;
575 }
576
577 if (smb->hard_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
578 val = smb->hard_cold_temp_limit;
579
580 val = clamp_val(val, -5, 10) + 5;
581 val /= 5;
582 /* this goes from higher to lower so invert the value */
583 val = ~val & 0x3;
584
585 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
586 CFG_TEMP_LIMIT_HARD_COLD_MASK,
587 val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT);
588 if (ret < 0)
589 return ret;
590
591 enable_therm_monitor = true;
592 }
593
594 if (smb->hard_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
595 val = smb->hard_hot_temp_limit;
596
597 val = clamp_val(val, 50, 65) - 50;
598 val /= 5;
599
600 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
601 CFG_TEMP_LIMIT_HARD_HOT_MASK,
602 val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT);
603 if (ret < 0)
604 return ret;
605
606 enable_therm_monitor = true;
607 }
608
609 /*
610 * If any of the temperature limits are set, we also enable the
611 * thermistor monitoring.
612 *
613 * When soft limits are hit, the device will start to compensate
614 * current and/or voltage depending on the configuration.
615 *
616 * When hard limit is hit, the device will suspend charging
617 * depending on the configuration.
618 */
619 if (enable_therm_monitor) {
620 ret = regmap_update_bits(smb->regmap, CFG_THERM,
621 CFG_THERM_MONITOR_DISABLED, 0);
622 if (ret < 0)
623 return ret;
624 }
625
626 if (smb->suspend_on_hard_temp_limit) {
627 ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
628 CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED, 0);
629 if (ret < 0)
630 return ret;
631 }
632
633 if (smb->soft_temp_limit_compensation !=
634 SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT) {
635 val = smb->soft_temp_limit_compensation & 0x3;
636
637 ret = regmap_update_bits(smb->regmap, CFG_THERM,
638 CFG_THERM_SOFT_HOT_COMPENSATION_MASK,
639 val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT);
640 if (ret < 0)
641 return ret;
642
643 ret = regmap_update_bits(smb->regmap, CFG_THERM,
644 CFG_THERM_SOFT_COLD_COMPENSATION_MASK,
645 val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT);
646 if (ret < 0)
647 return ret;
648 }
649
650 if (smb->charge_current_compensation) {
651 val = current_to_hw(ccc_tbl[id], ARRAY_SIZE(ccc_tbl[id]),
652 smb->charge_current_compensation);
653 if (val < 0)
654 return val;
655
656 ret = regmap_update_bits(smb->regmap, CFG_OTG,
657 CFG_OTG_CC_COMPENSATION_MASK,
658 (val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT);
659 if (ret < 0)
660 return ret;
661 }
662
663 return ret;
664 }
665
666 /*
667 * smb347_set_writable - enables/disables writing to non-volatile registers
668 * @smb: pointer to smb347 charger instance
669 *
670 * You can enable/disable writing to the non-volatile configuration
671 * registers by calling this function.
672 *
673 * Returns %0 on success and negative errno in case of failure.
674 */
smb347_set_writable(struct smb347_charger * smb,bool writable)675 static int smb347_set_writable(struct smb347_charger *smb, bool writable)
676 {
677 return regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE,
678 writable ? CMD_A_ALLOW_WRITE : 0);
679 }
680
smb347_hw_init(struct smb347_charger * smb)681 static int smb347_hw_init(struct smb347_charger *smb)
682 {
683 unsigned int val;
684 int ret;
685
686 ret = smb347_set_writable(smb, true);
687 if (ret < 0)
688 return ret;
689
690 /*
691 * Program the platform specific configuration values to the device
692 * first.
693 */
694 ret = smb347_set_charge_current(smb);
695 if (ret < 0)
696 goto fail;
697
698 ret = smb347_set_current_limits(smb);
699 if (ret < 0)
700 goto fail;
701
702 ret = smb347_set_voltage_limits(smb);
703 if (ret < 0)
704 goto fail;
705
706 ret = smb347_set_temp_limits(smb);
707 if (ret < 0)
708 goto fail;
709
710 /* If USB charging is disabled we put the USB in suspend mode */
711 if (!smb->use_usb) {
712 ret = regmap_update_bits(smb->regmap, CMD_A,
713 CMD_A_SUSPEND_ENABLED,
714 CMD_A_SUSPEND_ENABLED);
715 if (ret < 0)
716 goto fail;
717 }
718
719 /*
720 * If configured by platform data, we enable hardware Auto-OTG
721 * support for driving VBUS. Otherwise we disable it.
722 */
723 ret = regmap_update_bits(smb->regmap, CFG_OTHER, CFG_OTHER_RID_MASK,
724 smb->use_usb_otg ? CFG_OTHER_RID_ENABLED_AUTO_OTG : 0);
725 if (ret < 0)
726 goto fail;
727
728 /*
729 * Make the charging functionality controllable by a write to the
730 * command register unless pin control is specified in the platform
731 * data.
732 */
733 switch (smb->enable_control) {
734 case SMB3XX_CHG_ENABLE_PIN_ACTIVE_LOW:
735 val = CFG_PIN_EN_CTRL_ACTIVE_LOW;
736 break;
737 case SMB3XX_CHG_ENABLE_PIN_ACTIVE_HIGH:
738 val = CFG_PIN_EN_CTRL_ACTIVE_HIGH;
739 break;
740 default:
741 val = 0;
742 break;
743 }
744
745 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL_MASK,
746 val);
747 if (ret < 0)
748 goto fail;
749
750 /* Disable Automatic Power Source Detection (APSD) interrupt. */
751 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_APSD_IRQ, 0);
752 if (ret < 0)
753 goto fail;
754
755 ret = smb347_update_ps_status(smb);
756 if (ret < 0)
757 goto fail;
758
759 ret = smb347_start_stop_charging(smb);
760
761 fail:
762 smb347_set_writable(smb, false);
763 return ret;
764 }
765
smb347_interrupt(int irq,void * data)766 static irqreturn_t smb347_interrupt(int irq, void *data)
767 {
768 struct smb347_charger *smb = data;
769 unsigned int stat_c, irqstat_c, irqstat_d, irqstat_e;
770 bool handled = false;
771 int ret;
772
773 /* SMB347 it needs at least 20ms for setting IRQSTAT_E_*IN_UV_IRQ */
774 usleep_range(25000, 35000);
775
776 ret = regmap_read(smb->regmap, STAT_C, &stat_c);
777 if (ret < 0) {
778 dev_warn(smb->dev, "reading STAT_C failed\n");
779 return IRQ_NONE;
780 }
781
782 ret = regmap_read(smb->regmap, IRQSTAT_C, &irqstat_c);
783 if (ret < 0) {
784 dev_warn(smb->dev, "reading IRQSTAT_C failed\n");
785 return IRQ_NONE;
786 }
787
788 ret = regmap_read(smb->regmap, IRQSTAT_D, &irqstat_d);
789 if (ret < 0) {
790 dev_warn(smb->dev, "reading IRQSTAT_D failed\n");
791 return IRQ_NONE;
792 }
793
794 ret = regmap_read(smb->regmap, IRQSTAT_E, &irqstat_e);
795 if (ret < 0) {
796 dev_warn(smb->dev, "reading IRQSTAT_E failed\n");
797 return IRQ_NONE;
798 }
799
800 /*
801 * If we get charger error we report the error back to user.
802 * If the error is recovered charging will resume again.
803 */
804 if (stat_c & STAT_C_CHARGER_ERROR) {
805 dev_err(smb->dev, "charging stopped due to charger error\n");
806 if (smb->use_mains)
807 power_supply_changed(smb->mains);
808 if (smb->use_usb)
809 power_supply_changed(smb->usb);
810 handled = true;
811 }
812
813 /*
814 * If we reached the termination current the battery is charged and
815 * we can update the status now. Charging is automatically
816 * disabled by the hardware.
817 */
818 if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {
819 if (irqstat_c & IRQSTAT_C_TERMINATION_STAT) {
820 if (smb->use_mains)
821 power_supply_changed(smb->mains);
822 if (smb->use_usb)
823 power_supply_changed(smb->usb);
824 }
825 dev_dbg(smb->dev, "going to HW maintenance mode\n");
826 handled = true;
827 }
828
829 /*
830 * If we got a charger timeout INT that means the charge
831 * full is not detected with in charge timeout value.
832 */
833 if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_IRQ) {
834 dev_dbg(smb->dev, "total Charge Timeout INT received\n");
835
836 if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_STAT)
837 dev_warn(smb->dev, "charging stopped due to timeout\n");
838 if (smb->use_mains)
839 power_supply_changed(smb->mains);
840 if (smb->use_usb)
841 power_supply_changed(smb->usb);
842 handled = true;
843 }
844
845 /*
846 * If we got an under voltage interrupt it means that AC/USB input
847 * was connected or disconnected.
848 */
849 if (irqstat_e & (IRQSTAT_E_USBIN_UV_IRQ | IRQSTAT_E_DCIN_UV_IRQ)) {
850 if (smb347_update_ps_status(smb) > 0) {
851 smb347_start_stop_charging(smb);
852 if (smb->use_mains)
853 power_supply_changed(smb->mains);
854 if (smb->use_usb)
855 power_supply_changed(smb->usb);
856 }
857 handled = true;
858 }
859
860 return handled ? IRQ_HANDLED : IRQ_NONE;
861 }
862
smb347_irq_set(struct smb347_charger * smb,bool enable)863 static int smb347_irq_set(struct smb347_charger *smb, bool enable)
864 {
865 int ret;
866
867 if (smb->irq_unsupported)
868 return 0;
869
870 ret = smb347_set_writable(smb, true);
871 if (ret < 0)
872 return ret;
873
874 /*
875 * Enable/disable interrupts for:
876 * - under voltage
877 * - termination current reached
878 * - charger timeout
879 * - charger error
880 */
881 ret = regmap_update_bits(smb->regmap, CFG_FAULT_IRQ, 0xff,
882 enable ? CFG_FAULT_IRQ_DCIN_UV : 0);
883 if (ret < 0)
884 goto fail;
885
886 ret = regmap_update_bits(smb->regmap, CFG_STATUS_IRQ, 0xff,
887 enable ? (CFG_STATUS_IRQ_TERMINATION_OR_TAPER |
888 CFG_STATUS_IRQ_CHARGE_TIMEOUT) : 0);
889 if (ret < 0)
890 goto fail;
891
892 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CHARGER_ERROR,
893 enable ? CFG_PIN_EN_CHARGER_ERROR : 0);
894 fail:
895 smb347_set_writable(smb, false);
896 return ret;
897 }
898
smb347_irq_enable(struct smb347_charger * smb)899 static inline int smb347_irq_enable(struct smb347_charger *smb)
900 {
901 return smb347_irq_set(smb, true);
902 }
903
smb347_irq_disable(struct smb347_charger * smb)904 static inline int smb347_irq_disable(struct smb347_charger *smb)
905 {
906 return smb347_irq_set(smb, false);
907 }
908
smb347_irq_init(struct smb347_charger * smb,struct i2c_client * client)909 static int smb347_irq_init(struct smb347_charger *smb,
910 struct i2c_client *client)
911 {
912 int ret;
913
914 smb->irq_unsupported = true;
915
916 /*
917 * Interrupt pin is optional. If it is connected, we setup the
918 * interrupt support here.
919 */
920 if (!client->irq)
921 return 0;
922
923 ret = smb347_set_writable(smb, true);
924 if (ret < 0)
925 return ret;
926
927 /*
928 * Configure the STAT output to be suitable for interrupts: disable
929 * all other output (except interrupts) and make it active low.
930 */
931 ret = regmap_update_bits(smb->regmap, CFG_STAT,
932 CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED,
933 CFG_STAT_DISABLED);
934
935 smb347_set_writable(smb, false);
936
937 if (ret < 0) {
938 dev_warn(smb->dev, "failed to initialize IRQ: %d\n", ret);
939 dev_warn(smb->dev, "disabling IRQ support\n");
940 return 0;
941 }
942
943 ret = devm_request_threaded_irq(smb->dev, client->irq, NULL,
944 smb347_interrupt, IRQF_ONESHOT,
945 client->name, smb);
946 if (ret)
947 return ret;
948
949 smb->irq_unsupported = false;
950
951 ret = smb347_irq_enable(smb);
952 if (ret < 0)
953 return ret;
954
955 return 0;
956 }
957
958 /*
959 * Returns the constant charge current programmed
960 * into the charger in uA.
961 */
get_const_charge_current(struct smb347_charger * smb)962 static int get_const_charge_current(struct smb347_charger *smb)
963 {
964 unsigned int id = smb->id;
965 int ret, intval;
966 unsigned int v;
967
968 if (!smb347_is_ps_online(smb))
969 return -ENODATA;
970
971 ret = regmap_read(smb->regmap, STAT_B, &v);
972 if (ret < 0)
973 return ret;
974
975 /*
976 * The current value is composition of FCC and PCC values
977 * and we can detect which table to use from bit 5.
978 */
979 if (v & 0x20) {
980 intval = hw_to_current(fcc_tbl[id],
981 ARRAY_SIZE(fcc_tbl[id]), v & 7);
982 } else {
983 v >>= 3;
984 intval = hw_to_current(pcc_tbl[id],
985 ARRAY_SIZE(pcc_tbl[id]), v & 7);
986 }
987
988 return intval;
989 }
990
991 /*
992 * Returns the constant charge voltage programmed
993 * into the charger in uV.
994 */
get_const_charge_voltage(struct smb347_charger * smb)995 static int get_const_charge_voltage(struct smb347_charger *smb)
996 {
997 int ret, intval;
998 unsigned int v;
999
1000 if (!smb347_is_ps_online(smb))
1001 return -ENODATA;
1002
1003 ret = regmap_read(smb->regmap, STAT_A, &v);
1004 if (ret < 0)
1005 return ret;
1006
1007 v &= STAT_A_FLOAT_VOLTAGE_MASK;
1008 if (v > 0x3d)
1009 v = 0x3d;
1010
1011 intval = 3500000 + v * 20000;
1012
1013 return intval;
1014 }
1015
smb347_get_charging_status(struct smb347_charger * smb,struct power_supply * psy)1016 static int smb347_get_charging_status(struct smb347_charger *smb,
1017 struct power_supply *psy)
1018 {
1019 int ret, status;
1020 unsigned int val;
1021
1022 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
1023 if (!smb->usb_online)
1024 return POWER_SUPPLY_STATUS_DISCHARGING;
1025 } else {
1026 if (!smb->mains_online)
1027 return POWER_SUPPLY_STATUS_DISCHARGING;
1028 }
1029
1030 ret = regmap_read(smb->regmap, STAT_C, &val);
1031 if (ret < 0)
1032 return ret;
1033
1034 if ((val & STAT_C_CHARGER_ERROR) ||
1035 (val & STAT_C_HOLDOFF_STAT)) {
1036 /*
1037 * set to NOT CHARGING upon charger error
1038 * or charging has stopped.
1039 */
1040 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1041 } else {
1042 if ((val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT) {
1043 /*
1044 * set to charging if battery is in pre-charge,
1045 * fast charge or taper charging mode.
1046 */
1047 status = POWER_SUPPLY_STATUS_CHARGING;
1048 } else if (val & STAT_C_CHG_TERM) {
1049 /*
1050 * set the status to FULL if battery is not in pre
1051 * charge, fast charge or taper charging mode AND
1052 * charging is terminated at least once.
1053 */
1054 status = POWER_SUPPLY_STATUS_FULL;
1055 } else {
1056 /*
1057 * in this case no charger error or termination
1058 * occured but charging is not in progress!!!
1059 */
1060 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1061 }
1062 }
1063
1064 return status;
1065 }
1066
smb347_get_property_locked(struct power_supply * psy,enum power_supply_property prop,union power_supply_propval * val)1067 static int smb347_get_property_locked(struct power_supply *psy,
1068 enum power_supply_property prop,
1069 union power_supply_propval *val)
1070 {
1071 struct smb347_charger *smb = power_supply_get_drvdata(psy);
1072 int ret;
1073
1074 switch (prop) {
1075 case POWER_SUPPLY_PROP_STATUS:
1076 ret = smb347_get_charging_status(smb, psy);
1077 if (ret < 0)
1078 return ret;
1079 val->intval = ret;
1080 break;
1081
1082 case POWER_SUPPLY_PROP_CHARGE_TYPE:
1083 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
1084 if (!smb->usb_online)
1085 return -ENODATA;
1086 } else {
1087 if (!smb->mains_online)
1088 return -ENODATA;
1089 }
1090
1091 /*
1092 * We handle trickle and pre-charging the same, and taper
1093 * and none the same.
1094 */
1095 switch (smb347_charging_status(smb)) {
1096 case 1:
1097 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
1098 break;
1099 case 2:
1100 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
1101 break;
1102 default:
1103 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
1104 break;
1105 }
1106 break;
1107
1108 case POWER_SUPPLY_PROP_ONLINE:
1109 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
1110 val->intval = smb->usb_online;
1111 else
1112 val->intval = smb->mains_online;
1113 break;
1114
1115 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
1116 ret = get_const_charge_voltage(smb);
1117 if (ret < 0)
1118 return ret;
1119 val->intval = ret;
1120 break;
1121
1122 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
1123 ret = get_const_charge_current(smb);
1124 if (ret < 0)
1125 return ret;
1126 val->intval = ret;
1127 break;
1128
1129 default:
1130 return -EINVAL;
1131 }
1132
1133 return 0;
1134 }
1135
smb347_get_property(struct power_supply * psy,enum power_supply_property prop,union power_supply_propval * val)1136 static int smb347_get_property(struct power_supply *psy,
1137 enum power_supply_property prop,
1138 union power_supply_propval *val)
1139 {
1140 struct smb347_charger *smb = power_supply_get_drvdata(psy);
1141 struct i2c_client *client = to_i2c_client(smb->dev);
1142 int ret;
1143
1144 if (!smb->irq_unsupported)
1145 disable_irq(client->irq);
1146
1147 ret = smb347_get_property_locked(psy, prop, val);
1148
1149 if (!smb->irq_unsupported)
1150 enable_irq(client->irq);
1151
1152 return ret;
1153 }
1154
1155 static enum power_supply_property smb347_properties[] = {
1156 POWER_SUPPLY_PROP_STATUS,
1157 POWER_SUPPLY_PROP_CHARGE_TYPE,
1158 POWER_SUPPLY_PROP_ONLINE,
1159 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
1160 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
1161 };
1162
smb347_volatile_reg(struct device * dev,unsigned int reg)1163 static bool smb347_volatile_reg(struct device *dev, unsigned int reg)
1164 {
1165 switch (reg) {
1166 case IRQSTAT_A:
1167 case IRQSTAT_C:
1168 case IRQSTAT_D:
1169 case IRQSTAT_E:
1170 case IRQSTAT_F:
1171 case STAT_A:
1172 case STAT_B:
1173 case STAT_C:
1174 case STAT_E:
1175 return true;
1176 }
1177
1178 return false;
1179 }
1180
smb347_readable_reg(struct device * dev,unsigned int reg)1181 static bool smb347_readable_reg(struct device *dev, unsigned int reg)
1182 {
1183 switch (reg) {
1184 case CFG_CHARGE_CURRENT:
1185 case CFG_CURRENT_LIMIT:
1186 case CFG_FLOAT_VOLTAGE:
1187 case CFG_STAT:
1188 case CFG_PIN:
1189 case CFG_THERM:
1190 case CFG_SYSOK:
1191 case CFG_OTHER:
1192 case CFG_OTG:
1193 case CFG_TEMP_LIMIT:
1194 case CFG_FAULT_IRQ:
1195 case CFG_STATUS_IRQ:
1196 case CFG_ADDRESS:
1197 case CMD_A:
1198 case CMD_B:
1199 case CMD_C:
1200 return true;
1201 }
1202
1203 return smb347_volatile_reg(dev, reg);
1204 }
1205
smb347_dt_parse_dev_info(struct smb347_charger * smb)1206 static void smb347_dt_parse_dev_info(struct smb347_charger *smb)
1207 {
1208 struct device *dev = smb->dev;
1209
1210 smb->soft_temp_limit_compensation =
1211 SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT;
1212 /*
1213 * These properties come from the battery info, still we need to
1214 * pre-initialize the values. See smb347_get_battery_info() below.
1215 */
1216 smb->soft_cold_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
1217 smb->hard_cold_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
1218 smb->soft_hot_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
1219 smb->hard_hot_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
1220
1221 /* Charging constraints */
1222 device_property_read_u32(dev, "summit,fast-voltage-threshold-microvolt",
1223 &smb->pre_to_fast_voltage);
1224 device_property_read_u32(dev, "summit,mains-current-limit-microamp",
1225 &smb->mains_current_limit);
1226 device_property_read_u32(dev, "summit,usb-current-limit-microamp",
1227 &smb->usb_hc_current_limit);
1228
1229 /* For thermometer monitoring */
1230 device_property_read_u32(dev, "summit,chip-temperature-threshold-celsius",
1231 &smb->chip_temp_threshold);
1232 device_property_read_u32(dev, "summit,soft-compensation-method",
1233 &smb->soft_temp_limit_compensation);
1234 device_property_read_u32(dev, "summit,charge-current-compensation-microamp",
1235 &smb->charge_current_compensation);
1236
1237 /* Supported charging mode */
1238 smb->use_mains = device_property_read_bool(dev, "summit,enable-mains-charging");
1239 smb->use_usb = device_property_read_bool(dev, "summit,enable-usb-charging");
1240 smb->use_usb_otg = device_property_read_bool(dev, "summit,enable-otg-charging");
1241
1242 /* Select charging control */
1243 device_property_read_u32(dev, "summit,enable-charge-control",
1244 &smb->enable_control);
1245 }
1246
smb347_get_battery_info(struct smb347_charger * smb)1247 static int smb347_get_battery_info(struct smb347_charger *smb)
1248 {
1249 struct power_supply_battery_info info = {};
1250 struct power_supply *supply;
1251 int err;
1252
1253 if (smb->mains)
1254 supply = smb->mains;
1255 else
1256 supply = smb->usb;
1257
1258 err = power_supply_get_battery_info(supply, &info);
1259 if (err == -ENXIO || err == -ENODEV)
1260 return 0;
1261 if (err)
1262 return err;
1263
1264 if (info.constant_charge_current_max_ua != -EINVAL)
1265 smb->max_charge_current = info.constant_charge_current_max_ua;
1266
1267 if (info.constant_charge_voltage_max_uv != -EINVAL)
1268 smb->max_charge_voltage = info.constant_charge_voltage_max_uv;
1269
1270 if (info.precharge_current_ua != -EINVAL)
1271 smb->pre_charge_current = info.precharge_current_ua;
1272
1273 if (info.charge_term_current_ua != -EINVAL)
1274 smb->termination_current = info.charge_term_current_ua;
1275
1276 if (info.temp_alert_min != INT_MIN)
1277 smb->soft_cold_temp_limit = info.temp_alert_min;
1278
1279 if (info.temp_alert_max != INT_MAX)
1280 smb->soft_hot_temp_limit = info.temp_alert_max;
1281
1282 if (info.temp_min != INT_MIN)
1283 smb->hard_cold_temp_limit = info.temp_min;
1284
1285 if (info.temp_max != INT_MAX)
1286 smb->hard_hot_temp_limit = info.temp_max;
1287
1288 /* Suspend when battery temperature is outside hard limits */
1289 if (smb->hard_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT ||
1290 smb->hard_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT)
1291 smb->suspend_on_hard_temp_limit = true;
1292
1293 return 0;
1294 }
1295
1296 static const struct regmap_config smb347_regmap = {
1297 .reg_bits = 8,
1298 .val_bits = 8,
1299 .max_register = SMB347_MAX_REGISTER,
1300 .volatile_reg = smb347_volatile_reg,
1301 .readable_reg = smb347_readable_reg,
1302 };
1303
1304 static const struct power_supply_desc smb347_mains_desc = {
1305 .name = "smb347-mains",
1306 .type = POWER_SUPPLY_TYPE_MAINS,
1307 .get_property = smb347_get_property,
1308 .properties = smb347_properties,
1309 .num_properties = ARRAY_SIZE(smb347_properties),
1310 };
1311
1312 static const struct power_supply_desc smb347_usb_desc = {
1313 .name = "smb347-usb",
1314 .type = POWER_SUPPLY_TYPE_USB,
1315 .get_property = smb347_get_property,
1316 .properties = smb347_properties,
1317 .num_properties = ARRAY_SIZE(smb347_properties),
1318 };
1319
smb347_probe(struct i2c_client * client,const struct i2c_device_id * id)1320 static int smb347_probe(struct i2c_client *client,
1321 const struct i2c_device_id *id)
1322 {
1323 struct power_supply_config mains_usb_cfg = {};
1324 struct device *dev = &client->dev;
1325 struct smb347_charger *smb;
1326 int ret;
1327
1328 smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);
1329 if (!smb)
1330 return -ENOMEM;
1331 smb->dev = &client->dev;
1332 smb->id = id->driver_data;
1333 i2c_set_clientdata(client, smb);
1334
1335 smb347_dt_parse_dev_info(smb);
1336 if (!smb->use_mains && !smb->use_usb)
1337 return -EINVAL;
1338
1339 smb->regmap = devm_regmap_init_i2c(client, &smb347_regmap);
1340 if (IS_ERR(smb->regmap))
1341 return PTR_ERR(smb->regmap);
1342
1343 mains_usb_cfg.drv_data = smb;
1344 mains_usb_cfg.of_node = dev->of_node;
1345 if (smb->use_mains) {
1346 smb->mains = devm_power_supply_register(dev, &smb347_mains_desc,
1347 &mains_usb_cfg);
1348 if (IS_ERR(smb->mains))
1349 return PTR_ERR(smb->mains);
1350 }
1351
1352 if (smb->use_usb) {
1353 smb->usb = devm_power_supply_register(dev, &smb347_usb_desc,
1354 &mains_usb_cfg);
1355 if (IS_ERR(smb->usb))
1356 return PTR_ERR(smb->usb);
1357 }
1358
1359 ret = smb347_get_battery_info(smb);
1360 if (ret)
1361 return ret;
1362
1363 ret = smb347_hw_init(smb);
1364 if (ret < 0)
1365 return ret;
1366
1367 ret = smb347_irq_init(smb, client);
1368 if (ret)
1369 return ret;
1370
1371 return 0;
1372 }
1373
smb347_remove(struct i2c_client * client)1374 static int smb347_remove(struct i2c_client *client)
1375 {
1376 struct smb347_charger *smb = i2c_get_clientdata(client);
1377
1378 smb347_irq_disable(smb);
1379
1380 return 0;
1381 }
1382
1383 static const struct i2c_device_id smb347_id[] = {
1384 { "smb345", SMB345 },
1385 { "smb347", SMB347 },
1386 { "smb358", SMB358 },
1387 { },
1388 };
1389 MODULE_DEVICE_TABLE(i2c, smb347_id);
1390
1391 static const struct of_device_id smb3xx_of_match[] = {
1392 { .compatible = "summit,smb345" },
1393 { .compatible = "summit,smb347" },
1394 { .compatible = "summit,smb358" },
1395 { },
1396 };
1397 MODULE_DEVICE_TABLE(of, smb3xx_of_match);
1398
1399 static struct i2c_driver smb347_driver = {
1400 .driver = {
1401 .name = "smb347",
1402 .of_match_table = smb3xx_of_match,
1403 },
1404 .probe = smb347_probe,
1405 .remove = smb347_remove,
1406 .id_table = smb347_id,
1407 };
1408 module_i2c_driver(smb347_driver);
1409
1410 MODULE_AUTHOR("Bruce E. Robertson <bruce.e.robertson@intel.com>");
1411 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1412 MODULE_DESCRIPTION("SMB347 battery charger driver");
1413 MODULE_LICENSE("GPL");
1414