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authorBruce E. Robertson <bruce.e.robertson@intel.com>2012-02-06 10:59:01 -0500
committerAnton Vorontsov <anton.vorontsov@linaro.org>2012-03-26 12:41:01 -0400
commited1a230f96eb4610f1f4296b8c3c067389ddf540 (patch)
tree42653c8122379507f3441b046dd85c6adff4c09f /drivers/power
parentd2c0077c54794d668b3639079a4262a52088d5e2 (diff)
Add I2C driver for Summit Microelectronics SMB347 Battery Charger.
Driver support for the Summit I²C battery charger. This is used in some Intel devices. Signed-off-by: Bruce E. Robertson <bruce.e.robertson@intel.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/Kconfig7
-rw-r--r--drivers/power/Makefile1
-rw-r--r--drivers/power/smb347-charger.c1294
3 files changed, 1302 insertions, 0 deletions
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 97680d8fa238..c728d26dca6c 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -274,4 +274,11 @@ config CHARGER_MAX8998
274 Say Y to enable support for the battery charger control sysfs and 274 Say Y to enable support for the battery charger control sysfs and
275 platform data of MAX8998/LP3974 PMICs. 275 platform data of MAX8998/LP3974 PMICs.
276 276
277config CHARGER_SMB347
278 tristate "Summit Microelectronics SMB347 Battery Charger"
279 depends on I2C
280 help
281 Say Y to include support for Summit Microelectronics SMB347
282 Battery Charger.
283
277endif # POWER_SUPPLY 284endif # POWER_SUPPLY
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index e429008eaf10..894710e336f0 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -41,3 +41,4 @@ obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o
41obj-$(CONFIG_CHARGER_MANAGER) += charger-manager.o 41obj-$(CONFIG_CHARGER_MANAGER) += charger-manager.o
42obj-$(CONFIG_CHARGER_MAX8997) += max8997_charger.o 42obj-$(CONFIG_CHARGER_MAX8997) += max8997_charger.o
43obj-$(CONFIG_CHARGER_MAX8998) += max8998_charger.o 43obj-$(CONFIG_CHARGER_MAX8998) += max8998_charger.o
44obj-$(CONFIG_CHARGER_SMB347) += smb347-charger.o
diff --git a/drivers/power/smb347-charger.c b/drivers/power/smb347-charger.c
new file mode 100644
index 000000000000..ce1694d1a365
--- /dev/null
+++ b/drivers/power/smb347-charger.c
@@ -0,0 +1,1294 @@
1/*
2 * Summit Microelectronics SMB347 Battery Charger Driver
3 *
4 * Copyright (C) 2011, Intel Corporation
5 *
6 * Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>
7 * Mika Westerberg <mika.westerberg@linux.intel.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/debugfs.h>
15#include <linux/gpio.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/interrupt.h>
20#include <linux/i2c.h>
21#include <linux/mutex.h>
22#include <linux/power_supply.h>
23#include <linux/power/smb347-charger.h>
24#include <linux/seq_file.h>
25
26/*
27 * Configuration registers. These are mirrored to volatile RAM and can be
28 * written once %CMD_A_ALLOW_WRITE is set in %CMD_A register. They will be
29 * reloaded from non-volatile registers after POR.
30 */
31#define CFG_CHARGE_CURRENT 0x00
32#define CFG_CHARGE_CURRENT_FCC_MASK 0xe0
33#define CFG_CHARGE_CURRENT_FCC_SHIFT 5
34#define CFG_CHARGE_CURRENT_PCC_MASK 0x18
35#define CFG_CHARGE_CURRENT_PCC_SHIFT 3
36#define CFG_CHARGE_CURRENT_TC_MASK 0x07
37#define CFG_CURRENT_LIMIT 0x01
38#define CFG_CURRENT_LIMIT_DC_MASK 0xf0
39#define CFG_CURRENT_LIMIT_DC_SHIFT 4
40#define CFG_CURRENT_LIMIT_USB_MASK 0x0f
41#define CFG_FLOAT_VOLTAGE 0x03
42#define CFG_FLOAT_VOLTAGE_THRESHOLD_MASK 0xc0
43#define CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT 6
44#define CFG_STAT 0x05
45#define CFG_STAT_DISABLED BIT(5)
46#define CFG_STAT_ACTIVE_HIGH BIT(7)
47#define CFG_PIN 0x06
48#define CFG_PIN_EN_CTRL_MASK 0x60
49#define CFG_PIN_EN_CTRL_ACTIVE_HIGH 0x40
50#define CFG_PIN_EN_CTRL_ACTIVE_LOW 0x60
51#define CFG_PIN_EN_APSD_IRQ BIT(1)
52#define CFG_PIN_EN_CHARGER_ERROR BIT(2)
53#define CFG_THERM 0x07
54#define CFG_THERM_SOFT_HOT_COMPENSATION_MASK 0x03
55#define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT 0
56#define CFG_THERM_SOFT_COLD_COMPENSATION_MASK 0x0c
57#define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT 2
58#define CFG_THERM_MONITOR_DISABLED BIT(4)
59#define CFG_SYSOK 0x08
60#define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED BIT(2)
61#define CFG_OTHER 0x09
62#define CFG_OTHER_RID_MASK 0xc0
63#define CFG_OTHER_RID_ENABLED_AUTO_OTG 0xc0
64#define CFG_OTG 0x0a
65#define CFG_OTG_TEMP_THRESHOLD_MASK 0x30
66#define CFG_OTG_TEMP_THRESHOLD_SHIFT 4
67#define CFG_OTG_CC_COMPENSATION_MASK 0xc0
68#define CFG_OTG_CC_COMPENSATION_SHIFT 6
69#define CFG_TEMP_LIMIT 0x0b
70#define CFG_TEMP_LIMIT_SOFT_HOT_MASK 0x03
71#define CFG_TEMP_LIMIT_SOFT_HOT_SHIFT 0
72#define CFG_TEMP_LIMIT_SOFT_COLD_MASK 0x0c
73#define CFG_TEMP_LIMIT_SOFT_COLD_SHIFT 2
74#define CFG_TEMP_LIMIT_HARD_HOT_MASK 0x30
75#define CFG_TEMP_LIMIT_HARD_HOT_SHIFT 4
76#define CFG_TEMP_LIMIT_HARD_COLD_MASK 0xc0
77#define CFG_TEMP_LIMIT_HARD_COLD_SHIFT 6
78#define CFG_FAULT_IRQ 0x0c
79#define CFG_FAULT_IRQ_DCIN_UV BIT(2)
80#define CFG_STATUS_IRQ 0x0d
81#define CFG_STATUS_IRQ_TERMINATION_OR_TAPER BIT(4)
82#define CFG_ADDRESS 0x0e
83
84/* Command registers */
85#define CMD_A 0x30
86#define CMD_A_CHG_ENABLED BIT(1)
87#define CMD_A_SUSPEND_ENABLED BIT(2)
88#define CMD_A_ALLOW_WRITE BIT(7)
89#define CMD_B 0x31
90#define CMD_C 0x33
91
92/* Interrupt Status registers */
93#define IRQSTAT_A 0x35
94#define IRQSTAT_C 0x37
95#define IRQSTAT_C_TERMINATION_STAT BIT(0)
96#define IRQSTAT_C_TERMINATION_IRQ BIT(1)
97#define IRQSTAT_C_TAPER_IRQ BIT(3)
98#define IRQSTAT_E 0x39
99#define IRQSTAT_E_USBIN_UV_STAT BIT(0)
100#define IRQSTAT_E_USBIN_UV_IRQ BIT(1)
101#define IRQSTAT_E_DCIN_UV_STAT BIT(4)
102#define IRQSTAT_E_DCIN_UV_IRQ BIT(5)
103#define IRQSTAT_F 0x3a
104
105/* Status registers */
106#define STAT_A 0x3b
107#define STAT_A_FLOAT_VOLTAGE_MASK 0x3f
108#define STAT_B 0x3c
109#define STAT_C 0x3d
110#define STAT_C_CHG_ENABLED BIT(0)
111#define STAT_C_CHG_MASK 0x06
112#define STAT_C_CHG_SHIFT 1
113#define STAT_C_CHARGER_ERROR BIT(6)
114#define STAT_E 0x3f
115
116/**
117 * struct smb347_charger - smb347 charger instance
118 * @lock: protects concurrent access to online variables
119 * @client: pointer to i2c client
120 * @mains: power_supply instance for AC/DC power
121 * @usb: power_supply instance for USB power
122 * @battery: power_supply instance for battery
123 * @mains_online: is AC/DC input connected
124 * @usb_online: is USB input connected
125 * @charging_enabled: is charging enabled
126 * @dentry: for debugfs
127 * @pdata: pointer to platform data
128 */
129struct smb347_charger {
130 struct mutex lock;
131 struct i2c_client *client;
132 struct power_supply mains;
133 struct power_supply usb;
134 struct power_supply battery;
135 bool mains_online;
136 bool usb_online;
137 bool charging_enabled;
138 struct dentry *dentry;
139 const struct smb347_charger_platform_data *pdata;
140};
141
142/* Fast charge current in uA */
143static const unsigned int fcc_tbl[] = {
144 700000,
145 900000,
146 1200000,
147 1500000,
148 1800000,
149 2000000,
150 2200000,
151 2500000,
152};
153
154/* Pre-charge current in uA */
155static const unsigned int pcc_tbl[] = {
156 100000,
157 150000,
158 200000,
159 250000,
160};
161
162/* Termination current in uA */
163static const unsigned int tc_tbl[] = {
164 37500,
165 50000,
166 100000,
167 150000,
168 200000,
169 250000,
170 500000,
171 600000,
172};
173
174/* Input current limit in uA */
175static const unsigned int icl_tbl[] = {
176 300000,
177 500000,
178 700000,
179 900000,
180 1200000,
181 1500000,
182 1800000,
183 2000000,
184 2200000,
185 2500000,
186};
187
188/* Charge current compensation in uA */
189static const unsigned int ccc_tbl[] = {
190 250000,
191 700000,
192 900000,
193 1200000,
194};
195
196/* Convert register value to current using lookup table */
197static int hw_to_current(const unsigned int *tbl, size_t size, unsigned int val)
198{
199 if (val >= size)
200 return -EINVAL;
201 return tbl[val];
202}
203
204/* Convert current to register value using lookup table */
205static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)
206{
207 size_t i;
208
209 for (i = 0; i < size; i++)
210 if (val < tbl[i])
211 break;
212 return i > 0 ? i - 1 : -EINVAL;
213}
214
215static int smb347_read(struct smb347_charger *smb, u8 reg)
216{
217 int ret;
218
219 ret = i2c_smbus_read_byte_data(smb->client, reg);
220 if (ret < 0)
221 dev_warn(&smb->client->dev, "failed to read reg 0x%x: %d\n",
222 reg, ret);
223 return ret;
224}
225
226static int smb347_write(struct smb347_charger *smb, u8 reg, u8 val)
227{
228 int ret;
229
230 ret = i2c_smbus_write_byte_data(smb->client, reg, val);
231 if (ret < 0)
232 dev_warn(&smb->client->dev, "failed to write reg 0x%x: %d\n",
233 reg, ret);
234 return ret;
235}
236
237/**
238 * smb347_update_status - updates the charging status
239 * @smb: pointer to smb347 charger instance
240 *
241 * Function checks status of the charging and updates internal state
242 * accordingly. Returns %0 if there is no change in status, %1 if the
243 * status has changed and negative errno in case of failure.
244 */
245static int smb347_update_status(struct smb347_charger *smb)
246{
247 bool usb = false;
248 bool dc = false;
249 int ret;
250
251 ret = smb347_read(smb, IRQSTAT_E);
252 if (ret < 0)
253 return ret;
254
255 /*
256 * Dc and usb are set depending on whether they are enabled in
257 * platform data _and_ whether corresponding undervoltage is set.
258 */
259 if (smb->pdata->use_mains)
260 dc = !(ret & IRQSTAT_E_DCIN_UV_STAT);
261 if (smb->pdata->use_usb)
262 usb = !(ret & IRQSTAT_E_USBIN_UV_STAT);
263
264 mutex_lock(&smb->lock);
265 ret = smb->mains_online != dc || smb->usb_online != usb;
266 smb->mains_online = dc;
267 smb->usb_online = usb;
268 mutex_unlock(&smb->lock);
269
270 return ret;
271}
272
273/*
274 * smb347_is_online - returns whether input power source is connected
275 * @smb: pointer to smb347 charger instance
276 *
277 * Returns %true if input power source is connected. Note that this is
278 * dependent on what platform has configured for usable power sources. For
279 * example if USB is disabled, this will return %false even if the USB
280 * cable is connected.
281 */
282static bool smb347_is_online(struct smb347_charger *smb)
283{
284 bool ret;
285
286 mutex_lock(&smb->lock);
287 ret = smb->usb_online || smb->mains_online;
288 mutex_unlock(&smb->lock);
289
290 return ret;
291}
292
293/**
294 * smb347_charging_status - returns status of charging
295 * @smb: pointer to smb347 charger instance
296 *
297 * Function returns charging status. %0 means no charging is in progress,
298 * %1 means pre-charging, %2 fast-charging and %3 taper-charging.
299 */
300static int smb347_charging_status(struct smb347_charger *smb)
301{
302 int ret;
303
304 if (!smb347_is_online(smb))
305 return 0;
306
307 ret = smb347_read(smb, STAT_C);
308 if (ret < 0)
309 return 0;
310
311 return (ret & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT;
312}
313
314static int smb347_charging_set(struct smb347_charger *smb, bool enable)
315{
316 int ret = 0;
317
318 if (smb->pdata->enable_control != SMB347_CHG_ENABLE_SW) {
319 dev_dbg(&smb->client->dev,
320 "charging enable/disable in SW disabled\n");
321 return 0;
322 }
323
324 mutex_lock(&smb->lock);
325 if (smb->charging_enabled != enable) {
326 ret = smb347_read(smb, CMD_A);
327 if (ret < 0)
328 goto out;
329
330 smb->charging_enabled = enable;
331
332 if (enable)
333 ret |= CMD_A_CHG_ENABLED;
334 else
335 ret &= ~CMD_A_CHG_ENABLED;
336
337 ret = smb347_write(smb, CMD_A, ret);
338 }
339out:
340 mutex_unlock(&smb->lock);
341 return ret;
342}
343
344static inline int smb347_charging_enable(struct smb347_charger *smb)
345{
346 return smb347_charging_set(smb, true);
347}
348
349static inline int smb347_charging_disable(struct smb347_charger *smb)
350{
351 return smb347_charging_set(smb, false);
352}
353
354static int smb347_update_online(struct smb347_charger *smb)
355{
356 int ret;
357
358 /*
359 * Depending on whether valid power source is connected or not, we
360 * disable or enable the charging. We do it manually because it
361 * depends on how the platform has configured the valid inputs.
362 */
363 if (smb347_is_online(smb)) {
364 ret = smb347_charging_enable(smb);
365 if (ret < 0)
366 dev_err(&smb->client->dev,
367 "failed to enable charging\n");
368 } else {
369 ret = smb347_charging_disable(smb);
370 if (ret < 0)
371 dev_err(&smb->client->dev,
372 "failed to disable charging\n");
373 }
374
375 return ret;
376}
377
378static int smb347_set_charge_current(struct smb347_charger *smb)
379{
380 int ret, val;
381
382 ret = smb347_read(smb, CFG_CHARGE_CURRENT);
383 if (ret < 0)
384 return ret;
385
386 if (smb->pdata->max_charge_current) {
387 val = current_to_hw(fcc_tbl, ARRAY_SIZE(fcc_tbl),
388 smb->pdata->max_charge_current);
389 if (val < 0)
390 return val;
391
392 ret &= ~CFG_CHARGE_CURRENT_FCC_MASK;
393 ret |= val << CFG_CHARGE_CURRENT_FCC_SHIFT;
394 }
395
396 if (smb->pdata->pre_charge_current) {
397 val = current_to_hw(pcc_tbl, ARRAY_SIZE(pcc_tbl),
398 smb->pdata->pre_charge_current);
399 if (val < 0)
400 return val;
401
402 ret &= ~CFG_CHARGE_CURRENT_PCC_MASK;
403 ret |= val << CFG_CHARGE_CURRENT_PCC_SHIFT;
404 }
405
406 if (smb->pdata->termination_current) {
407 val = current_to_hw(tc_tbl, ARRAY_SIZE(tc_tbl),
408 smb->pdata->termination_current);
409 if (val < 0)
410 return val;
411
412 ret &= ~CFG_CHARGE_CURRENT_TC_MASK;
413 ret |= val;
414 }
415
416 return smb347_write(smb, CFG_CHARGE_CURRENT, ret);
417}
418
419static int smb347_set_current_limits(struct smb347_charger *smb)
420{
421 int ret, val;
422
423 ret = smb347_read(smb, CFG_CURRENT_LIMIT);
424 if (ret < 0)
425 return ret;
426
427 if (smb->pdata->mains_current_limit) {
428 val = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
429 smb->pdata->mains_current_limit);
430 if (val < 0)
431 return val;
432
433 ret &= ~CFG_CURRENT_LIMIT_DC_MASK;
434 ret |= val << CFG_CURRENT_LIMIT_DC_SHIFT;
435 }
436
437 if (smb->pdata->usb_hc_current_limit) {
438 val = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
439 smb->pdata->usb_hc_current_limit);
440 if (val < 0)
441 return val;
442
443 ret &= ~CFG_CURRENT_LIMIT_USB_MASK;
444 ret |= val;
445 }
446
447 return smb347_write(smb, CFG_CURRENT_LIMIT, ret);
448}
449
450static int smb347_set_voltage_limits(struct smb347_charger *smb)
451{
452 int ret, val;
453
454 ret = smb347_read(smb, CFG_FLOAT_VOLTAGE);
455 if (ret < 0)
456 return ret;
457
458 if (smb->pdata->pre_to_fast_voltage) {
459 val = smb->pdata->pre_to_fast_voltage;
460
461 /* uV */
462 val = clamp_val(val, 2400000, 3000000) - 2400000;
463 val /= 200000;
464
465 ret &= ~CFG_FLOAT_VOLTAGE_THRESHOLD_MASK;
466 ret |= val << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT;
467 }
468
469 if (smb->pdata->max_charge_voltage) {
470 val = smb->pdata->max_charge_voltage;
471
472 /* uV */
473 val = clamp_val(val, 3500000, 4500000) - 3500000;
474 val /= 20000;
475
476 ret |= val;
477 }
478
479 return smb347_write(smb, CFG_FLOAT_VOLTAGE, ret);
480}
481
482static int smb347_set_temp_limits(struct smb347_charger *smb)
483{
484 bool enable_therm_monitor = false;
485 int ret, val;
486
487 if (smb->pdata->chip_temp_threshold) {
488 val = smb->pdata->chip_temp_threshold;
489
490 /* degree C */
491 val = clamp_val(val, 100, 130) - 100;
492 val /= 10;
493
494 ret = smb347_read(smb, CFG_OTG);
495 if (ret < 0)
496 return ret;
497
498 ret &= ~CFG_OTG_TEMP_THRESHOLD_MASK;
499 ret |= val << CFG_OTG_TEMP_THRESHOLD_SHIFT;
500
501 ret = smb347_write(smb, CFG_OTG, ret);
502 if (ret < 0)
503 return ret;
504 }
505
506 ret = smb347_read(smb, CFG_TEMP_LIMIT);
507 if (ret < 0)
508 return ret;
509
510 if (smb->pdata->soft_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
511 val = smb->pdata->soft_cold_temp_limit;
512
513 val = clamp_val(val, 0, 15);
514 val /= 5;
515 /* this goes from higher to lower so invert the value */
516 val = ~val & 0x3;
517
518 ret &= ~CFG_TEMP_LIMIT_SOFT_COLD_MASK;
519 ret |= val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT;
520
521 enable_therm_monitor = true;
522 }
523
524 if (smb->pdata->soft_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
525 val = smb->pdata->soft_hot_temp_limit;
526
527 val = clamp_val(val, 40, 55) - 40;
528 val /= 5;
529
530 ret &= ~CFG_TEMP_LIMIT_SOFT_HOT_MASK;
531 ret |= val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT;
532
533 enable_therm_monitor = true;
534 }
535
536 if (smb->pdata->hard_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
537 val = smb->pdata->hard_cold_temp_limit;
538
539 val = clamp_val(val, -5, 10) + 5;
540 val /= 5;
541 /* this goes from higher to lower so invert the value */
542 val = ~val & 0x3;
543
544 ret &= ~CFG_TEMP_LIMIT_HARD_COLD_MASK;
545 ret |= val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT;
546
547 enable_therm_monitor = true;
548 }
549
550 if (smb->pdata->hard_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
551 val = smb->pdata->hard_hot_temp_limit;
552
553 val = clamp_val(val, 50, 65) - 50;
554 val /= 5;
555
556 ret &= ~CFG_TEMP_LIMIT_HARD_HOT_MASK;
557 ret |= val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT;
558
559 enable_therm_monitor = true;
560 }
561
562 ret = smb347_write(smb, CFG_TEMP_LIMIT, ret);
563 if (ret < 0)
564 return ret;
565
566 /*
567 * If any of the temperature limits are set, we also enable the
568 * thermistor monitoring.
569 *
570 * When soft limits are hit, the device will start to compensate
571 * current and/or voltage depending on the configuration.
572 *
573 * When hard limit is hit, the device will suspend charging
574 * depending on the configuration.
575 */
576 if (enable_therm_monitor) {
577 ret = smb347_read(smb, CFG_THERM);
578 if (ret < 0)
579 return ret;
580
581 ret &= ~CFG_THERM_MONITOR_DISABLED;
582
583 ret = smb347_write(smb, CFG_THERM, ret);
584 if (ret < 0)
585 return ret;
586 }
587
588 if (smb->pdata->suspend_on_hard_temp_limit) {
589 ret = smb347_read(smb, CFG_SYSOK);
590 if (ret < 0)
591 return ret;
592
593 ret &= ~CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED;
594
595 ret = smb347_write(smb, CFG_SYSOK, ret);
596 if (ret < 0)
597 return ret;
598 }
599
600 if (smb->pdata->soft_temp_limit_compensation !=
601 SMB347_SOFT_TEMP_COMPENSATE_DEFAULT) {
602 val = smb->pdata->soft_temp_limit_compensation & 0x3;
603
604 ret = smb347_read(smb, CFG_THERM);
605 if (ret < 0)
606 return ret;
607
608 ret &= ~CFG_THERM_SOFT_HOT_COMPENSATION_MASK;
609 ret |= val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT;
610
611 ret &= ~CFG_THERM_SOFT_COLD_COMPENSATION_MASK;
612 ret |= val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT;
613
614 ret = smb347_write(smb, CFG_THERM, ret);
615 if (ret < 0)
616 return ret;
617 }
618
619 if (smb->pdata->charge_current_compensation) {
620 val = current_to_hw(ccc_tbl, ARRAY_SIZE(ccc_tbl),
621 smb->pdata->charge_current_compensation);
622 if (val < 0)
623 return val;
624
625 ret = smb347_read(smb, CFG_OTG);
626 if (ret < 0)
627 return ret;
628
629 ret &= ~CFG_OTG_CC_COMPENSATION_MASK;
630 ret |= (val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT;
631
632 ret = smb347_write(smb, CFG_OTG, ret);
633 if (ret < 0)
634 return ret;
635 }
636
637 return ret;
638}
639
640/*
641 * smb347_set_writable - enables/disables writing to non-volatile registers
642 * @smb: pointer to smb347 charger instance
643 *
644 * You can enable/disable writing to the non-volatile configuration
645 * registers by calling this function.
646 *
647 * Returns %0 on success and negative errno in case of failure.
648 */
649static int smb347_set_writable(struct smb347_charger *smb, bool writable)
650{
651 int ret;
652
653 ret = smb347_read(smb, CMD_A);
654 if (ret < 0)
655 return ret;
656
657 if (writable)
658 ret |= CMD_A_ALLOW_WRITE;
659 else
660 ret &= ~CMD_A_ALLOW_WRITE;
661
662 return smb347_write(smb, CMD_A, ret);
663}
664
665static int smb347_hw_init(struct smb347_charger *smb)
666{
667 int ret;
668
669 ret = smb347_set_writable(smb, true);
670 if (ret < 0)
671 return ret;
672
673 /*
674 * Program the platform specific configuration values to the device
675 * first.
676 */
677 ret = smb347_set_charge_current(smb);
678 if (ret < 0)
679 goto fail;
680
681 ret = smb347_set_current_limits(smb);
682 if (ret < 0)
683 goto fail;
684
685 ret = smb347_set_voltage_limits(smb);
686 if (ret < 0)
687 goto fail;
688
689 ret = smb347_set_temp_limits(smb);
690 if (ret < 0)
691 goto fail;
692
693 /* If USB charging is disabled we put the USB in suspend mode */
694 if (!smb->pdata->use_usb) {
695 ret = smb347_read(smb, CMD_A);
696 if (ret < 0)
697 goto fail;
698
699 ret |= CMD_A_SUSPEND_ENABLED;
700
701 ret = smb347_write(smb, CMD_A, ret);
702 if (ret < 0)
703 goto fail;
704 }
705
706 ret = smb347_read(smb, CFG_OTHER);
707 if (ret < 0)
708 goto fail;
709
710 /*
711 * If configured by platform data, we enable hardware Auto-OTG
712 * support for driving VBUS. Otherwise we disable it.
713 */
714 ret &= ~CFG_OTHER_RID_MASK;
715 if (smb->pdata->use_usb_otg)
716 ret |= CFG_OTHER_RID_ENABLED_AUTO_OTG;
717
718 ret = smb347_write(smb, CFG_OTHER, ret);
719 if (ret < 0)
720 goto fail;
721
722 ret = smb347_read(smb, CFG_PIN);
723 if (ret < 0)
724 goto fail;
725
726 /*
727 * Make the charging functionality controllable by a write to the
728 * command register unless pin control is specified in the platform
729 * data.
730 */
731 ret &= ~CFG_PIN_EN_CTRL_MASK;
732
733 switch (smb->pdata->enable_control) {
734 case SMB347_CHG_ENABLE_SW:
735 /* Do nothing, 0 means i2c control */
736 break;
737 case SMB347_CHG_ENABLE_PIN_ACTIVE_LOW:
738 ret |= CFG_PIN_EN_CTRL_ACTIVE_LOW;
739 break;
740 case SMB347_CHG_ENABLE_PIN_ACTIVE_HIGH:
741 ret |= CFG_PIN_EN_CTRL_ACTIVE_HIGH;
742 break;
743 }
744
745 /* Disable Automatic Power Source Detection (APSD) interrupt. */
746 ret &= ~CFG_PIN_EN_APSD_IRQ;
747
748 ret = smb347_write(smb, CFG_PIN, ret);
749 if (ret < 0)
750 goto fail;
751
752 ret = smb347_update_status(smb);
753 if (ret < 0)
754 goto fail;
755
756 ret = smb347_update_online(smb);
757
758fail:
759 smb347_set_writable(smb, false);
760 return ret;
761}
762
763static irqreturn_t smb347_interrupt(int irq, void *data)
764{
765 struct smb347_charger *smb = data;
766 int stat_c, irqstat_e, irqstat_c;
767 irqreturn_t ret = IRQ_NONE;
768
769 stat_c = smb347_read(smb, STAT_C);
770 if (stat_c < 0) {
771 dev_warn(&smb->client->dev, "reading STAT_C failed\n");
772 return IRQ_NONE;
773 }
774
775 irqstat_c = smb347_read(smb, IRQSTAT_C);
776 if (irqstat_c < 0) {
777 dev_warn(&smb->client->dev, "reading IRQSTAT_C failed\n");
778 return IRQ_NONE;
779 }
780
781 irqstat_e = smb347_read(smb, IRQSTAT_E);
782 if (irqstat_e < 0) {
783 dev_warn(&smb->client->dev, "reading IRQSTAT_E failed\n");
784 return IRQ_NONE;
785 }
786
787 /*
788 * If we get charger error we report the error back to user and
789 * disable charging.
790 */
791 if (stat_c & STAT_C_CHARGER_ERROR) {
792 dev_err(&smb->client->dev,
793 "error in charger, disabling charging\n");
794
795 smb347_charging_disable(smb);
796 power_supply_changed(&smb->battery);
797
798 ret = IRQ_HANDLED;
799 }
800
801 /*
802 * If we reached the termination current the battery is charged and
803 * we can update the status now. Charging is automatically
804 * disabled by the hardware.
805 */
806 if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {
807 if (irqstat_c & IRQSTAT_C_TERMINATION_STAT)
808 power_supply_changed(&smb->battery);
809 ret = IRQ_HANDLED;
810 }
811
812 /*
813 * If we got an under voltage interrupt it means that AC/USB input
814 * was connected or disconnected.
815 */
816 if (irqstat_e & (IRQSTAT_E_USBIN_UV_IRQ | IRQSTAT_E_DCIN_UV_IRQ)) {
817 if (smb347_update_status(smb) > 0) {
818 smb347_update_online(smb);
819 power_supply_changed(&smb->mains);
820 power_supply_changed(&smb->usb);
821 }
822 ret = IRQ_HANDLED;
823 }
824
825 return ret;
826}
827
828static int smb347_irq_set(struct smb347_charger *smb, bool enable)
829{
830 int ret;
831
832 ret = smb347_set_writable(smb, true);
833 if (ret < 0)
834 return ret;
835
836 /*
837 * Enable/disable interrupts for:
838 * - under voltage
839 * - termination current reached
840 * - charger error
841 */
842 if (enable) {
843 ret = smb347_write(smb, CFG_FAULT_IRQ, CFG_FAULT_IRQ_DCIN_UV);
844 if (ret < 0)
845 goto fail;
846
847 ret = smb347_write(smb, CFG_STATUS_IRQ,
848 CFG_STATUS_IRQ_TERMINATION_OR_TAPER);
849 if (ret < 0)
850 goto fail;
851
852 ret = smb347_read(smb, CFG_PIN);
853 if (ret < 0)
854 goto fail;
855
856 ret |= CFG_PIN_EN_CHARGER_ERROR;
857
858 ret = smb347_write(smb, CFG_PIN, ret);
859 } else {
860 ret = smb347_write(smb, CFG_FAULT_IRQ, 0);
861 if (ret < 0)
862 goto fail;
863
864 ret = smb347_write(smb, CFG_STATUS_IRQ, 0);
865 if (ret < 0)
866 goto fail;
867
868 ret = smb347_read(smb, CFG_PIN);
869 if (ret < 0)
870 goto fail;
871
872 ret &= ~CFG_PIN_EN_CHARGER_ERROR;
873
874 ret = smb347_write(smb, CFG_PIN, ret);
875 }
876
877fail:
878 smb347_set_writable(smb, false);
879 return ret;
880}
881
882static inline int smb347_irq_enable(struct smb347_charger *smb)
883{
884 return smb347_irq_set(smb, true);
885}
886
887static inline int smb347_irq_disable(struct smb347_charger *smb)
888{
889 return smb347_irq_set(smb, false);
890}
891
892static int smb347_irq_init(struct smb347_charger *smb)
893{
894 const struct smb347_charger_platform_data *pdata = smb->pdata;
895 int ret, irq = gpio_to_irq(pdata->irq_gpio);
896
897 ret = gpio_request_one(pdata->irq_gpio, GPIOF_IN, smb->client->name);
898 if (ret < 0)
899 goto fail;
900
901 ret = request_threaded_irq(irq, NULL, smb347_interrupt,
902 IRQF_TRIGGER_FALLING, smb->client->name,
903 smb);
904 if (ret < 0)
905 goto fail_gpio;
906
907 ret = smb347_set_writable(smb, true);
908 if (ret < 0)
909 goto fail_irq;
910
911 /*
912 * Configure the STAT output to be suitable for interrupts: disable
913 * all other output (except interrupts) and make it active low.
914 */
915 ret = smb347_read(smb, CFG_STAT);
916 if (ret < 0)
917 goto fail_readonly;
918
919 ret &= ~CFG_STAT_ACTIVE_HIGH;
920 ret |= CFG_STAT_DISABLED;
921
922 ret = smb347_write(smb, CFG_STAT, ret);
923 if (ret < 0)
924 goto fail_readonly;
925
926 ret = smb347_irq_enable(smb);
927 if (ret < 0)
928 goto fail_readonly;
929
930 smb347_set_writable(smb, false);
931 smb->client->irq = irq;
932 return 0;
933
934fail_readonly:
935 smb347_set_writable(smb, false);
936fail_irq:
937 free_irq(irq, smb);
938fail_gpio:
939 gpio_free(pdata->irq_gpio);
940fail:
941 smb->client->irq = 0;
942 return ret;
943}
944
945static int smb347_mains_get_property(struct power_supply *psy,
946 enum power_supply_property prop,
947 union power_supply_propval *val)
948{
949 struct smb347_charger *smb =
950 container_of(psy, struct smb347_charger, mains);
951
952 if (prop == POWER_SUPPLY_PROP_ONLINE) {
953 val->intval = smb->mains_online;
954 return 0;
955 }
956 return -EINVAL;
957}
958
959static enum power_supply_property smb347_mains_properties[] = {
960 POWER_SUPPLY_PROP_ONLINE,
961};
962
963static int smb347_usb_get_property(struct power_supply *psy,
964 enum power_supply_property prop,
965 union power_supply_propval *val)
966{
967 struct smb347_charger *smb =
968 container_of(psy, struct smb347_charger, usb);
969
970 if (prop == POWER_SUPPLY_PROP_ONLINE) {
971 val->intval = smb->usb_online;
972 return 0;
973 }
974 return -EINVAL;
975}
976
977static enum power_supply_property smb347_usb_properties[] = {
978 POWER_SUPPLY_PROP_ONLINE,
979};
980
981static int smb347_battery_get_property(struct power_supply *psy,
982 enum power_supply_property prop,
983 union power_supply_propval *val)
984{
985 struct smb347_charger *smb =
986 container_of(psy, struct smb347_charger, battery);
987 const struct smb347_charger_platform_data *pdata = smb->pdata;
988 int ret;
989
990 ret = smb347_update_status(smb);
991 if (ret < 0)
992 return ret;
993
994 switch (prop) {
995 case POWER_SUPPLY_PROP_STATUS:
996 if (!smb347_is_online(smb)) {
997 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
998 break;
999 }
1000 if (smb347_charging_status(smb))
1001 val->intval = POWER_SUPPLY_STATUS_CHARGING;
1002 else
1003 val->intval = POWER_SUPPLY_STATUS_FULL;
1004 break;
1005
1006 case POWER_SUPPLY_PROP_CHARGE_TYPE:
1007 if (!smb347_is_online(smb))
1008 return -ENODATA;
1009
1010 /*
1011 * We handle trickle and pre-charging the same, and taper
1012 * and none the same.
1013 */
1014 switch (smb347_charging_status(smb)) {
1015 case 1:
1016 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
1017 break;
1018 case 2:
1019 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
1020 break;
1021 default:
1022 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
1023 break;
1024 }
1025 break;
1026
1027 case POWER_SUPPLY_PROP_TECHNOLOGY:
1028 val->intval = pdata->battery_info.technology;
1029 break;
1030
1031 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
1032 val->intval = pdata->battery_info.voltage_min_design;
1033 break;
1034
1035 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
1036 val->intval = pdata->battery_info.voltage_max_design;
1037 break;
1038
1039 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1040 if (!smb347_is_online(smb))
1041 return -ENODATA;
1042 ret = smb347_read(smb, STAT_A);
1043 if (ret < 0)
1044 return ret;
1045
1046 ret &= STAT_A_FLOAT_VOLTAGE_MASK;
1047 if (ret > 0x3d)
1048 ret = 0x3d;
1049
1050 val->intval = 3500000 + ret * 20000;
1051 break;
1052
1053 case POWER_SUPPLY_PROP_CURRENT_NOW:
1054 if (!smb347_is_online(smb))
1055 return -ENODATA;
1056
1057 ret = smb347_read(smb, STAT_B);
1058 if (ret < 0)
1059 return ret;
1060
1061 /*
1062 * The current value is composition of FCC and PCC values
1063 * and we can detect which table to use from bit 5.
1064 */
1065 if (ret & 0x20) {
1066 val->intval = hw_to_current(fcc_tbl,
1067 ARRAY_SIZE(fcc_tbl),
1068 ret & 7);
1069 } else {
1070 ret >>= 3;
1071 val->intval = hw_to_current(pcc_tbl,
1072 ARRAY_SIZE(pcc_tbl),
1073 ret & 7);
1074 }
1075 break;
1076
1077 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1078 val->intval = pdata->battery_info.charge_full_design;
1079 break;
1080
1081 case POWER_SUPPLY_PROP_MODEL_NAME:
1082 val->strval = pdata->battery_info.name;
1083 break;
1084
1085 default:
1086 return -EINVAL;
1087 }
1088
1089 return 0;
1090}
1091
1092static enum power_supply_property smb347_battery_properties[] = {
1093 POWER_SUPPLY_PROP_STATUS,
1094 POWER_SUPPLY_PROP_CHARGE_TYPE,
1095 POWER_SUPPLY_PROP_TECHNOLOGY,
1096 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
1097 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
1098 POWER_SUPPLY_PROP_VOLTAGE_NOW,
1099 POWER_SUPPLY_PROP_CURRENT_NOW,
1100 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
1101 POWER_SUPPLY_PROP_MODEL_NAME,
1102};
1103
1104static int smb347_debugfs_show(struct seq_file *s, void *data)
1105{
1106 struct smb347_charger *smb = s->private;
1107 int ret;
1108 u8 reg;
1109
1110 seq_printf(s, "Control registers:\n");
1111 seq_printf(s, "==================\n");
1112 for (reg = CFG_CHARGE_CURRENT; reg <= CFG_ADDRESS; reg++) {
1113 ret = smb347_read(smb, reg);
1114 seq_printf(s, "0x%02x:\t0x%02x\n", reg, ret);
1115 }
1116 seq_printf(s, "\n");
1117
1118 seq_printf(s, "Command registers:\n");
1119 seq_printf(s, "==================\n");
1120 ret = smb347_read(smb, CMD_A);
1121 seq_printf(s, "0x%02x:\t0x%02x\n", CMD_A, ret);
1122 ret = smb347_read(smb, CMD_B);
1123 seq_printf(s, "0x%02x:\t0x%02x\n", CMD_B, ret);
1124 ret = smb347_read(smb, CMD_C);
1125 seq_printf(s, "0x%02x:\t0x%02x\n", CMD_C, ret);
1126 seq_printf(s, "\n");
1127
1128 seq_printf(s, "Interrupt status registers:\n");
1129 seq_printf(s, "===========================\n");
1130 for (reg = IRQSTAT_A; reg <= IRQSTAT_F; reg++) {
1131 ret = smb347_read(smb, reg);
1132 seq_printf(s, "0x%02x:\t0x%02x\n", reg, ret);
1133 }
1134 seq_printf(s, "\n");
1135
1136 seq_printf(s, "Status registers:\n");
1137 seq_printf(s, "=================\n");
1138 for (reg = STAT_A; reg <= STAT_E; reg++) {
1139 ret = smb347_read(smb, reg);
1140 seq_printf(s, "0x%02x:\t0x%02x\n", reg, ret);
1141 }
1142
1143 return 0;
1144}
1145
1146static int smb347_debugfs_open(struct inode *inode, struct file *file)
1147{
1148 return single_open(file, smb347_debugfs_show, inode->i_private);
1149}
1150
1151static const struct file_operations smb347_debugfs_fops = {
1152 .open = smb347_debugfs_open,
1153 .read = seq_read,
1154 .llseek = seq_lseek,
1155 .release = single_release,
1156};
1157
1158static int smb347_probe(struct i2c_client *client,
1159 const struct i2c_device_id *id)
1160{
1161 static char *battery[] = { "smb347-battery" };
1162 const struct smb347_charger_platform_data *pdata;
1163 struct device *dev = &client->dev;
1164 struct smb347_charger *smb;
1165 int ret;
1166
1167 pdata = dev->platform_data;
1168 if (!pdata)
1169 return -EINVAL;
1170
1171 if (!pdata->use_mains && !pdata->use_usb)
1172 return -EINVAL;
1173
1174 smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);
1175 if (!smb)
1176 return -ENOMEM;
1177
1178 i2c_set_clientdata(client, smb);
1179
1180 mutex_init(&smb->lock);
1181 smb->client = client;
1182 smb->pdata = pdata;
1183
1184 ret = smb347_hw_init(smb);
1185 if (ret < 0)
1186 return ret;
1187
1188 smb->mains.name = "smb347-mains";
1189 smb->mains.type = POWER_SUPPLY_TYPE_MAINS;
1190 smb->mains.get_property = smb347_mains_get_property;
1191 smb->mains.properties = smb347_mains_properties;
1192 smb->mains.num_properties = ARRAY_SIZE(smb347_mains_properties);
1193 smb->mains.supplied_to = battery;
1194 smb->mains.num_supplicants = ARRAY_SIZE(battery);
1195
1196 smb->usb.name = "smb347-usb";
1197 smb->usb.type = POWER_SUPPLY_TYPE_USB;
1198 smb->usb.get_property = smb347_usb_get_property;
1199 smb->usb.properties = smb347_usb_properties;
1200 smb->usb.num_properties = ARRAY_SIZE(smb347_usb_properties);
1201 smb->usb.supplied_to = battery;
1202 smb->usb.num_supplicants = ARRAY_SIZE(battery);
1203
1204 smb->battery.name = "smb347-battery";
1205 smb->battery.type = POWER_SUPPLY_TYPE_BATTERY;
1206 smb->battery.get_property = smb347_battery_get_property;
1207 smb->battery.properties = smb347_battery_properties;
1208 smb->battery.num_properties = ARRAY_SIZE(smb347_battery_properties);
1209
1210 ret = power_supply_register(dev, &smb->mains);
1211 if (ret < 0)
1212 return ret;
1213
1214 ret = power_supply_register(dev, &smb->usb);
1215 if (ret < 0) {
1216 power_supply_unregister(&smb->mains);
1217 return ret;
1218 }
1219
1220 ret = power_supply_register(dev, &smb->battery);
1221 if (ret < 0) {
1222 power_supply_unregister(&smb->usb);
1223 power_supply_unregister(&smb->mains);
1224 return ret;
1225 }
1226
1227 /*
1228 * Interrupt pin is optional. If it is connected, we setup the
1229 * interrupt support here.
1230 */
1231 if (pdata->irq_gpio >= 0) {
1232 ret = smb347_irq_init(smb);
1233 if (ret < 0) {
1234 dev_warn(dev, "failed to initialize IRQ: %d\n", ret);
1235 dev_warn(dev, "disabling IRQ support\n");
1236 }
1237 }
1238
1239 smb->dentry = debugfs_create_file("smb347-regs", S_IRUSR, NULL, smb,
1240 &smb347_debugfs_fops);
1241 return 0;
1242}
1243
1244static int smb347_remove(struct i2c_client *client)
1245{
1246 struct smb347_charger *smb = i2c_get_clientdata(client);
1247
1248 if (!IS_ERR_OR_NULL(smb->dentry))
1249 debugfs_remove(smb->dentry);
1250
1251 if (client->irq) {
1252 smb347_irq_disable(smb);
1253 free_irq(client->irq, smb);
1254 gpio_free(smb->pdata->irq_gpio);
1255 }
1256
1257 power_supply_unregister(&smb->battery);
1258 power_supply_unregister(&smb->usb);
1259 power_supply_unregister(&smb->mains);
1260 return 0;
1261}
1262
1263static const struct i2c_device_id smb347_id[] = {
1264 { "smb347", 0 },
1265 { }
1266};
1267MODULE_DEVICE_TABLE(i2c, smb347_id);
1268
1269static struct i2c_driver smb347_driver = {
1270 .driver = {
1271 .name = "smb347",
1272 },
1273 .probe = smb347_probe,
1274 .remove = __devexit_p(smb347_remove),
1275 .id_table = smb347_id,
1276};
1277
1278static int __init smb347_init(void)
1279{
1280 return i2c_add_driver(&smb347_driver);
1281}
1282module_init(smb347_init);
1283
1284static void __exit smb347_exit(void)
1285{
1286 i2c_del_driver(&smb347_driver);
1287}
1288module_exit(smb347_exit);
1289
1290MODULE_AUTHOR("Bruce E. Robertson <bruce.e.robertson@intel.com>");
1291MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1292MODULE_DESCRIPTION("SMB347 battery charger driver");
1293MODULE_LICENSE("GPL");
1294MODULE_ALIAS("i2c:smb347");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 20:59:23 -0500