2 * Summit Microelectronics SMB347 Battery Charger Driver
4 * Copyright (C) 2011, Intel Corporation
6 * Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>
7 * Mika Westerberg <mika.westerberg@linux.intel.com>
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.
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>
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.
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
45 #define CFG_STAT_DISABLED BIT(5)
46 #define CFG_STAT_ACTIVE_HIGH BIT(7)
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
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
84 /* Command registers */
86 #define CMD_A_CHG_ENABLED BIT(1)
87 #define CMD_A_SUSPEND_ENABLED BIT(2)
88 #define CMD_A_ALLOW_WRITE BIT(7)
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
105 /* Status registers */
107 #define STAT_A_FLOAT_VOLTAGE_MASK 0x3f
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)
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
129 struct smb347_charger {
131 struct i2c_client *client;
132 struct power_supply mains;
133 struct power_supply usb;
134 struct power_supply battery;
137 bool charging_enabled;
138 struct dentry *dentry;
139 const struct smb347_charger_platform_data *pdata;
142 /* Fast charge current in uA */
143 static const unsigned int fcc_tbl[] = {
154 /* Pre-charge current in uA */
155 static const unsigned int pcc_tbl[] = {
162 /* Termination current in uA */
163 static const unsigned int tc_tbl[] = {
174 /* Input current limit in uA */
175 static const unsigned int icl_tbl[] = {
188 /* Charge current compensation in uA */
189 static const unsigned int ccc_tbl[] = {
196 /* Convert register value to current using lookup table */
197 static int hw_to_current(const unsigned int *tbl, size_t size, unsigned int val)
204 /* Convert current to register value using lookup table */
205 static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)
209 for (i = 0; i < size; i++)
212 return i > 0 ? i - 1 : -EINVAL;
215 static int smb347_read(struct smb347_charger *smb, u8 reg)
219 ret = i2c_smbus_read_byte_data(smb->client, reg);
221 dev_warn(&smb->client->dev, "failed to read reg 0x%x: %d\n",
226 static int smb347_write(struct smb347_charger *smb, u8 reg, u8 val)
230 ret = i2c_smbus_write_byte_data(smb->client, reg, val);
232 dev_warn(&smb->client->dev, "failed to write reg 0x%x: %d\n",
238 * smb347_update_status - updates the charging status
239 * @smb: pointer to smb347 charger instance
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.
245 static int smb347_update_status(struct smb347_charger *smb)
251 ret = smb347_read(smb, IRQSTAT_E);
256 * Dc and usb are set depending on whether they are enabled in
257 * platform data _and_ whether corresponding undervoltage is set.
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);
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);
274 * smb347_is_online - returns whether input power source is connected
275 * @smb: pointer to smb347 charger instance
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.
282 static bool smb347_is_online(struct smb347_charger *smb)
286 mutex_lock(&smb->lock);
287 ret = smb->usb_online || smb->mains_online;
288 mutex_unlock(&smb->lock);
294 * smb347_charging_status - returns status of charging
295 * @smb: pointer to smb347 charger instance
297 * Function returns charging status. %0 means no charging is in progress,
298 * %1 means pre-charging, %2 fast-charging and %3 taper-charging.
300 static int smb347_charging_status(struct smb347_charger *smb)
304 if (!smb347_is_online(smb))
307 ret = smb347_read(smb, STAT_C);
311 return (ret & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT;
314 static int smb347_charging_set(struct smb347_charger *smb, bool enable)
318 if (smb->pdata->enable_control != SMB347_CHG_ENABLE_SW) {
319 dev_dbg(&smb->client->dev,
320 "charging enable/disable in SW disabled\n");
324 mutex_lock(&smb->lock);
325 if (smb->charging_enabled != enable) {
326 ret = smb347_read(smb, CMD_A);
330 smb->charging_enabled = enable;
333 ret |= CMD_A_CHG_ENABLED;
335 ret &= ~CMD_A_CHG_ENABLED;
337 ret = smb347_write(smb, CMD_A, ret);
340 mutex_unlock(&smb->lock);
344 static inline int smb347_charging_enable(struct smb347_charger *smb)
346 return smb347_charging_set(smb, true);
349 static inline int smb347_charging_disable(struct smb347_charger *smb)
351 return smb347_charging_set(smb, false);
354 static int smb347_update_online(struct smb347_charger *smb)
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.
363 if (smb347_is_online(smb)) {
364 ret = smb347_charging_enable(smb);
366 dev_err(&smb->client->dev,
367 "failed to enable charging\n");
369 ret = smb347_charging_disable(smb);
371 dev_err(&smb->client->dev,
372 "failed to disable charging\n");
378 static int smb347_set_charge_current(struct smb347_charger *smb)
382 ret = smb347_read(smb, CFG_CHARGE_CURRENT);
386 if (smb->pdata->max_charge_current) {
387 val = current_to_hw(fcc_tbl, ARRAY_SIZE(fcc_tbl),
388 smb->pdata->max_charge_current);
392 ret &= ~CFG_CHARGE_CURRENT_FCC_MASK;
393 ret |= val << CFG_CHARGE_CURRENT_FCC_SHIFT;
396 if (smb->pdata->pre_charge_current) {
397 val = current_to_hw(pcc_tbl, ARRAY_SIZE(pcc_tbl),
398 smb->pdata->pre_charge_current);
402 ret &= ~CFG_CHARGE_CURRENT_PCC_MASK;
403 ret |= val << CFG_CHARGE_CURRENT_PCC_SHIFT;
406 if (smb->pdata->termination_current) {
407 val = current_to_hw(tc_tbl, ARRAY_SIZE(tc_tbl),
408 smb->pdata->termination_current);
412 ret &= ~CFG_CHARGE_CURRENT_TC_MASK;
416 return smb347_write(smb, CFG_CHARGE_CURRENT, ret);
419 static int smb347_set_current_limits(struct smb347_charger *smb)
423 ret = smb347_read(smb, CFG_CURRENT_LIMIT);
427 if (smb->pdata->mains_current_limit) {
428 val = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
429 smb->pdata->mains_current_limit);
433 ret &= ~CFG_CURRENT_LIMIT_DC_MASK;
434 ret |= val << CFG_CURRENT_LIMIT_DC_SHIFT;
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);
443 ret &= ~CFG_CURRENT_LIMIT_USB_MASK;
447 return smb347_write(smb, CFG_CURRENT_LIMIT, ret);
450 static int smb347_set_voltage_limits(struct smb347_charger *smb)
454 ret = smb347_read(smb, CFG_FLOAT_VOLTAGE);
458 if (smb->pdata->pre_to_fast_voltage) {
459 val = smb->pdata->pre_to_fast_voltage;
462 val = clamp_val(val, 2400000, 3000000) - 2400000;
465 ret &= ~CFG_FLOAT_VOLTAGE_THRESHOLD_MASK;
466 ret |= val << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT;
469 if (smb->pdata->max_charge_voltage) {
470 val = smb->pdata->max_charge_voltage;
473 val = clamp_val(val, 3500000, 4500000) - 3500000;
479 return smb347_write(smb, CFG_FLOAT_VOLTAGE, ret);
482 static int smb347_set_temp_limits(struct smb347_charger *smb)
484 bool enable_therm_monitor = false;
487 if (smb->pdata->chip_temp_threshold) {
488 val = smb->pdata->chip_temp_threshold;
491 val = clamp_val(val, 100, 130) - 100;
494 ret = smb347_read(smb, CFG_OTG);
498 ret &= ~CFG_OTG_TEMP_THRESHOLD_MASK;
499 ret |= val << CFG_OTG_TEMP_THRESHOLD_SHIFT;
501 ret = smb347_write(smb, CFG_OTG, ret);
506 ret = smb347_read(smb, CFG_TEMP_LIMIT);
510 if (smb->pdata->soft_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
511 val = smb->pdata->soft_cold_temp_limit;
513 val = clamp_val(val, 0, 15);
515 /* this goes from higher to lower so invert the value */
518 ret &= ~CFG_TEMP_LIMIT_SOFT_COLD_MASK;
519 ret |= val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT;
521 enable_therm_monitor = true;
524 if (smb->pdata->soft_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
525 val = smb->pdata->soft_hot_temp_limit;
527 val = clamp_val(val, 40, 55) - 40;
530 ret &= ~CFG_TEMP_LIMIT_SOFT_HOT_MASK;
531 ret |= val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT;
533 enable_therm_monitor = true;
536 if (smb->pdata->hard_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
537 val = smb->pdata->hard_cold_temp_limit;
539 val = clamp_val(val, -5, 10) + 5;
541 /* this goes from higher to lower so invert the value */
544 ret &= ~CFG_TEMP_LIMIT_HARD_COLD_MASK;
545 ret |= val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT;
547 enable_therm_monitor = true;
550 if (smb->pdata->hard_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
551 val = smb->pdata->hard_hot_temp_limit;
553 val = clamp_val(val, 50, 65) - 50;
556 ret &= ~CFG_TEMP_LIMIT_HARD_HOT_MASK;
557 ret |= val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT;
559 enable_therm_monitor = true;
562 ret = smb347_write(smb, CFG_TEMP_LIMIT, ret);
567 * If any of the temperature limits are set, we also enable the
568 * thermistor monitoring.
570 * When soft limits are hit, the device will start to compensate
571 * current and/or voltage depending on the configuration.
573 * When hard limit is hit, the device will suspend charging
574 * depending on the configuration.
576 if (enable_therm_monitor) {
577 ret = smb347_read(smb, CFG_THERM);
581 ret &= ~CFG_THERM_MONITOR_DISABLED;
583 ret = smb347_write(smb, CFG_THERM, ret);
588 if (smb->pdata->suspend_on_hard_temp_limit) {
589 ret = smb347_read(smb, CFG_SYSOK);
593 ret &= ~CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED;
595 ret = smb347_write(smb, CFG_SYSOK, ret);
600 if (smb->pdata->soft_temp_limit_compensation !=
601 SMB347_SOFT_TEMP_COMPENSATE_DEFAULT) {
602 val = smb->pdata->soft_temp_limit_compensation & 0x3;
604 ret = smb347_read(smb, CFG_THERM);
608 ret &= ~CFG_THERM_SOFT_HOT_COMPENSATION_MASK;
609 ret |= val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT;
611 ret &= ~CFG_THERM_SOFT_COLD_COMPENSATION_MASK;
612 ret |= val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT;
614 ret = smb347_write(smb, CFG_THERM, ret);
619 if (smb->pdata->charge_current_compensation) {
620 val = current_to_hw(ccc_tbl, ARRAY_SIZE(ccc_tbl),
621 smb->pdata->charge_current_compensation);
625 ret = smb347_read(smb, CFG_OTG);
629 ret &= ~CFG_OTG_CC_COMPENSATION_MASK;
630 ret |= (val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT;
632 ret = smb347_write(smb, CFG_OTG, ret);
641 * smb347_set_writable - enables/disables writing to non-volatile registers
642 * @smb: pointer to smb347 charger instance
644 * You can enable/disable writing to the non-volatile configuration
645 * registers by calling this function.
647 * Returns %0 on success and negative errno in case of failure.
649 static int smb347_set_writable(struct smb347_charger *smb, bool writable)
653 ret = smb347_read(smb, CMD_A);
658 ret |= CMD_A_ALLOW_WRITE;
660 ret &= ~CMD_A_ALLOW_WRITE;
662 return smb347_write(smb, CMD_A, ret);
665 static int smb347_hw_init(struct smb347_charger *smb)
669 ret = smb347_set_writable(smb, true);
674 * Program the platform specific configuration values to the device
677 ret = smb347_set_charge_current(smb);
681 ret = smb347_set_current_limits(smb);
685 ret = smb347_set_voltage_limits(smb);
689 ret = smb347_set_temp_limits(smb);
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);
699 ret |= CMD_A_SUSPEND_ENABLED;
701 ret = smb347_write(smb, CMD_A, ret);
706 ret = smb347_read(smb, CFG_OTHER);
711 * If configured by platform data, we enable hardware Auto-OTG
712 * support for driving VBUS. Otherwise we disable it.
714 ret &= ~CFG_OTHER_RID_MASK;
715 if (smb->pdata->use_usb_otg)
716 ret |= CFG_OTHER_RID_ENABLED_AUTO_OTG;
718 ret = smb347_write(smb, CFG_OTHER, ret);
722 ret = smb347_read(smb, CFG_PIN);
727 * Make the charging functionality controllable by a write to the
728 * command register unless pin control is specified in the platform
731 ret &= ~CFG_PIN_EN_CTRL_MASK;
733 switch (smb->pdata->enable_control) {
734 case SMB347_CHG_ENABLE_SW:
735 /* Do nothing, 0 means i2c control */
737 case SMB347_CHG_ENABLE_PIN_ACTIVE_LOW:
738 ret |= CFG_PIN_EN_CTRL_ACTIVE_LOW;
740 case SMB347_CHG_ENABLE_PIN_ACTIVE_HIGH:
741 ret |= CFG_PIN_EN_CTRL_ACTIVE_HIGH;
745 /* Disable Automatic Power Source Detection (APSD) interrupt. */
746 ret &= ~CFG_PIN_EN_APSD_IRQ;
748 ret = smb347_write(smb, CFG_PIN, ret);
752 ret = smb347_update_status(smb);
756 ret = smb347_update_online(smb);
759 smb347_set_writable(smb, false);
763 static irqreturn_t smb347_interrupt(int irq, void *data)
765 struct smb347_charger *smb = data;
766 int stat_c, irqstat_e, irqstat_c;
767 irqreturn_t ret = IRQ_NONE;
769 stat_c = smb347_read(smb, STAT_C);
771 dev_warn(&smb->client->dev, "reading STAT_C failed\n");
775 irqstat_c = smb347_read(smb, IRQSTAT_C);
777 dev_warn(&smb->client->dev, "reading IRQSTAT_C failed\n");
781 irqstat_e = smb347_read(smb, IRQSTAT_E);
783 dev_warn(&smb->client->dev, "reading IRQSTAT_E failed\n");
788 * If we get charger error we report the error back to user and
791 if (stat_c & STAT_C_CHARGER_ERROR) {
792 dev_err(&smb->client->dev,
793 "error in charger, disabling charging\n");
795 smb347_charging_disable(smb);
796 power_supply_changed(&smb->battery);
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.
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);
813 * If we got an under voltage interrupt it means that AC/USB input
814 * was connected or disconnected.
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);
828 static int smb347_irq_set(struct smb347_charger *smb, bool enable)
832 ret = smb347_set_writable(smb, true);
837 * Enable/disable interrupts for:
839 * - termination current reached
843 ret = smb347_write(smb, CFG_FAULT_IRQ, CFG_FAULT_IRQ_DCIN_UV);
847 ret = smb347_write(smb, CFG_STATUS_IRQ,
848 CFG_STATUS_IRQ_TERMINATION_OR_TAPER);
852 ret = smb347_read(smb, CFG_PIN);
856 ret |= CFG_PIN_EN_CHARGER_ERROR;
858 ret = smb347_write(smb, CFG_PIN, ret);
860 ret = smb347_write(smb, CFG_FAULT_IRQ, 0);
864 ret = smb347_write(smb, CFG_STATUS_IRQ, 0);
868 ret = smb347_read(smb, CFG_PIN);
872 ret &= ~CFG_PIN_EN_CHARGER_ERROR;
874 ret = smb347_write(smb, CFG_PIN, ret);
878 smb347_set_writable(smb, false);
882 static inline int smb347_irq_enable(struct smb347_charger *smb)
884 return smb347_irq_set(smb, true);
887 static inline int smb347_irq_disable(struct smb347_charger *smb)
889 return smb347_irq_set(smb, false);
892 static int smb347_irq_init(struct smb347_charger *smb)
894 const struct smb347_charger_platform_data *pdata = smb->pdata;
895 int ret, irq = gpio_to_irq(pdata->irq_gpio);
897 ret = gpio_request_one(pdata->irq_gpio, GPIOF_IN, smb->client->name);
901 ret = request_threaded_irq(irq, NULL, smb347_interrupt,
902 IRQF_TRIGGER_FALLING, smb->client->name,
907 ret = smb347_set_writable(smb, true);
912 * Configure the STAT output to be suitable for interrupts: disable
913 * all other output (except interrupts) and make it active low.
915 ret = smb347_read(smb, CFG_STAT);
919 ret &= ~CFG_STAT_ACTIVE_HIGH;
920 ret |= CFG_STAT_DISABLED;
922 ret = smb347_write(smb, CFG_STAT, ret);
926 ret = smb347_irq_enable(smb);
930 smb347_set_writable(smb, false);
931 smb->client->irq = irq;
935 smb347_set_writable(smb, false);
939 gpio_free(pdata->irq_gpio);
941 smb->client->irq = 0;
945 static int smb347_mains_get_property(struct power_supply *psy,
946 enum power_supply_property prop,
947 union power_supply_propval *val)
949 struct smb347_charger *smb =
950 container_of(psy, struct smb347_charger, mains);
952 if (prop == POWER_SUPPLY_PROP_ONLINE) {
953 val->intval = smb->mains_online;
959 static enum power_supply_property smb347_mains_properties[] = {
960 POWER_SUPPLY_PROP_ONLINE,
963 static int smb347_usb_get_property(struct power_supply *psy,
964 enum power_supply_property prop,
965 union power_supply_propval *val)
967 struct smb347_charger *smb =
968 container_of(psy, struct smb347_charger, usb);
970 if (prop == POWER_SUPPLY_PROP_ONLINE) {
971 val->intval = smb->usb_online;
977 static enum power_supply_property smb347_usb_properties[] = {
978 POWER_SUPPLY_PROP_ONLINE,
981 static int smb347_battery_get_property(struct power_supply *psy,
982 enum power_supply_property prop,
983 union power_supply_propval *val)
985 struct smb347_charger *smb =
986 container_of(psy, struct smb347_charger, battery);
987 const struct smb347_charger_platform_data *pdata = smb->pdata;
990 ret = smb347_update_status(smb);
995 case POWER_SUPPLY_PROP_STATUS:
996 if (!smb347_is_online(smb)) {
997 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
1000 if (smb347_charging_status(smb))
1001 val->intval = POWER_SUPPLY_STATUS_CHARGING;
1003 val->intval = POWER_SUPPLY_STATUS_FULL;
1006 case POWER_SUPPLY_PROP_CHARGE_TYPE:
1007 if (!smb347_is_online(smb))
1011 * We handle trickle and pre-charging the same, and taper
1012 * and none the same.
1014 switch (smb347_charging_status(smb)) {
1016 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
1019 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
1022 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
1027 case POWER_SUPPLY_PROP_TECHNOLOGY:
1028 val->intval = pdata->battery_info.technology;
1031 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
1032 val->intval = pdata->battery_info.voltage_min_design;
1035 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
1036 val->intval = pdata->battery_info.voltage_max_design;
1039 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1040 if (!smb347_is_online(smb))
1042 ret = smb347_read(smb, STAT_A);
1046 ret &= STAT_A_FLOAT_VOLTAGE_MASK;
1050 val->intval = 3500000 + ret * 20000;
1053 case POWER_SUPPLY_PROP_CURRENT_NOW:
1054 if (!smb347_is_online(smb))
1057 ret = smb347_read(smb, STAT_B);
1062 * The current value is composition of FCC and PCC values
1063 * and we can detect which table to use from bit 5.
1066 val->intval = hw_to_current(fcc_tbl,
1067 ARRAY_SIZE(fcc_tbl),
1071 val->intval = hw_to_current(pcc_tbl,
1072 ARRAY_SIZE(pcc_tbl),
1077 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1078 val->intval = pdata->battery_info.charge_full_design;
1081 case POWER_SUPPLY_PROP_MODEL_NAME:
1082 val->strval = pdata->battery_info.name;
1092 static 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,
1104 static int smb347_debugfs_show(struct seq_file *s, void *data)
1106 struct smb347_charger *smb = s->private;
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);
1116 seq_printf(s, "\n");
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");
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);
1134 seq_printf(s, "\n");
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);
1146 static int smb347_debugfs_open(struct inode *inode, struct file *file)
1148 return single_open(file, smb347_debugfs_show, inode->i_private);
1151 static const struct file_operations smb347_debugfs_fops = {
1152 .open = smb347_debugfs_open,
1154 .llseek = seq_lseek,
1155 .release = single_release,
1158 static int smb347_probe(struct i2c_client *client,
1159 const struct i2c_device_id *id)
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;
1167 pdata = dev->platform_data;
1171 if (!pdata->use_mains && !pdata->use_usb)
1174 smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);
1178 i2c_set_clientdata(client, smb);
1180 mutex_init(&smb->lock);
1181 smb->client = client;
1184 ret = smb347_hw_init(smb);
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);
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);
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);
1210 ret = power_supply_register(dev, &smb->mains);
1214 ret = power_supply_register(dev, &smb->usb);
1216 power_supply_unregister(&smb->mains);
1220 ret = power_supply_register(dev, &smb->battery);
1222 power_supply_unregister(&smb->usb);
1223 power_supply_unregister(&smb->mains);
1228 * Interrupt pin is optional. If it is connected, we setup the
1229 * interrupt support here.
1231 if (pdata->irq_gpio >= 0) {
1232 ret = smb347_irq_init(smb);
1234 dev_warn(dev, "failed to initialize IRQ: %d\n", ret);
1235 dev_warn(dev, "disabling IRQ support\n");
1239 smb->dentry = debugfs_create_file("smb347-regs", S_IRUSR, NULL, smb,
1240 &smb347_debugfs_fops);
1244 static int smb347_remove(struct i2c_client *client)
1246 struct smb347_charger *smb = i2c_get_clientdata(client);
1248 if (!IS_ERR_OR_NULL(smb->dentry))
1249 debugfs_remove(smb->dentry);
1252 smb347_irq_disable(smb);
1253 free_irq(client->irq, smb);
1254 gpio_free(smb->pdata->irq_gpio);
1257 power_supply_unregister(&smb->battery);
1258 power_supply_unregister(&smb->usb);
1259 power_supply_unregister(&smb->mains);
1263 static const struct i2c_device_id smb347_id[] = {
1267 MODULE_DEVICE_TABLE(i2c, smb347_id);
1269 static struct i2c_driver smb347_driver = {
1273 .probe = smb347_probe,
1274 .remove = __devexit_p(smb347_remove),
1275 .id_table = smb347_id,
1278 static int __init smb347_init(void)
1280 return i2c_add_driver(&smb347_driver);
1282 module_init(smb347_init);
1284 static void __exit smb347_exit(void)
1286 i2c_del_driver(&smb347_driver);
1288 module_exit(smb347_exit);
1290 MODULE_AUTHOR("Bruce E. Robertson <bruce.e.robertson@intel.com>");
1291 MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
1292 MODULE_DESCRIPTION("SMB347 battery charger driver");
1293 MODULE_LICENSE("GPL");
1294 MODULE_ALIAS("i2c:smb347");