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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/power/smb347-charger.c
Initial import
Diffstat (limited to 'drivers/power/smb347-charger.c')
-rw-r--r--drivers/power/smb347-charger.c1335
1 files changed, 1335 insertions, 0 deletions
diff --git a/drivers/power/smb347-charger.c b/drivers/power/smb347-charger.c
new file mode 100644
index 000000000..0b60a0b58
--- /dev/null
+++ b/drivers/power/smb347-charger.c
@@ -0,0 +1,1335 @@
+/*
+ * Summit Microelectronics SMB347 Battery Charger Driver
+ *
+ * Copyright (C) 2011, Intel Corporation
+ *
+ * Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>
+ * Mika Westerberg <mika.westerberg@linux.intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/power_supply.h>
+#include <linux/power/smb347-charger.h>
+#include <linux/regmap.h>
+
+/*
+ * Configuration registers. These are mirrored to volatile RAM and can be
+ * written once %CMD_A_ALLOW_WRITE is set in %CMD_A register. They will be
+ * reloaded from non-volatile registers after POR.
+ */
+#define CFG_CHARGE_CURRENT 0x00
+#define CFG_CHARGE_CURRENT_FCC_MASK 0xe0
+#define CFG_CHARGE_CURRENT_FCC_SHIFT 5
+#define CFG_CHARGE_CURRENT_PCC_MASK 0x18
+#define CFG_CHARGE_CURRENT_PCC_SHIFT 3
+#define CFG_CHARGE_CURRENT_TC_MASK 0x07
+#define CFG_CURRENT_LIMIT 0x01
+#define CFG_CURRENT_LIMIT_DC_MASK 0xf0
+#define CFG_CURRENT_LIMIT_DC_SHIFT 4
+#define CFG_CURRENT_LIMIT_USB_MASK 0x0f
+#define CFG_FLOAT_VOLTAGE 0x03
+#define CFG_FLOAT_VOLTAGE_FLOAT_MASK 0x3f
+#define CFG_FLOAT_VOLTAGE_THRESHOLD_MASK 0xc0
+#define CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT 6
+#define CFG_STAT 0x05
+#define CFG_STAT_DISABLED BIT(5)
+#define CFG_STAT_ACTIVE_HIGH BIT(7)
+#define CFG_PIN 0x06
+#define CFG_PIN_EN_CTRL_MASK 0x60
+#define CFG_PIN_EN_CTRL_ACTIVE_HIGH 0x40
+#define CFG_PIN_EN_CTRL_ACTIVE_LOW 0x60
+#define CFG_PIN_EN_APSD_IRQ BIT(1)
+#define CFG_PIN_EN_CHARGER_ERROR BIT(2)
+#define CFG_THERM 0x07
+#define CFG_THERM_SOFT_HOT_COMPENSATION_MASK 0x03
+#define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT 0
+#define CFG_THERM_SOFT_COLD_COMPENSATION_MASK 0x0c
+#define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT 2
+#define CFG_THERM_MONITOR_DISABLED BIT(4)
+#define CFG_SYSOK 0x08
+#define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED BIT(2)
+#define CFG_OTHER 0x09
+#define CFG_OTHER_RID_MASK 0xc0
+#define CFG_OTHER_RID_ENABLED_AUTO_OTG 0xc0
+#define CFG_OTG 0x0a
+#define CFG_OTG_TEMP_THRESHOLD_MASK 0x30
+#define CFG_OTG_TEMP_THRESHOLD_SHIFT 4
+#define CFG_OTG_CC_COMPENSATION_MASK 0xc0
+#define CFG_OTG_CC_COMPENSATION_SHIFT 6
+#define CFG_TEMP_LIMIT 0x0b
+#define CFG_TEMP_LIMIT_SOFT_HOT_MASK 0x03
+#define CFG_TEMP_LIMIT_SOFT_HOT_SHIFT 0
+#define CFG_TEMP_LIMIT_SOFT_COLD_MASK 0x0c
+#define CFG_TEMP_LIMIT_SOFT_COLD_SHIFT 2
+#define CFG_TEMP_LIMIT_HARD_HOT_MASK 0x30
+#define CFG_TEMP_LIMIT_HARD_HOT_SHIFT 4
+#define CFG_TEMP_LIMIT_HARD_COLD_MASK 0xc0
+#define CFG_TEMP_LIMIT_HARD_COLD_SHIFT 6
+#define CFG_FAULT_IRQ 0x0c
+#define CFG_FAULT_IRQ_DCIN_UV BIT(2)
+#define CFG_STATUS_IRQ 0x0d
+#define CFG_STATUS_IRQ_TERMINATION_OR_TAPER BIT(4)
+#define CFG_STATUS_IRQ_CHARGE_TIMEOUT BIT(7)
+#define CFG_ADDRESS 0x0e
+
+/* Command registers */
+#define CMD_A 0x30
+#define CMD_A_CHG_ENABLED BIT(1)
+#define CMD_A_SUSPEND_ENABLED BIT(2)
+#define CMD_A_ALLOW_WRITE BIT(7)
+#define CMD_B 0x31
+#define CMD_C 0x33
+
+/* Interrupt Status registers */
+#define IRQSTAT_A 0x35
+#define IRQSTAT_C 0x37
+#define IRQSTAT_C_TERMINATION_STAT BIT(0)
+#define IRQSTAT_C_TERMINATION_IRQ BIT(1)
+#define IRQSTAT_C_TAPER_IRQ BIT(3)
+#define IRQSTAT_D 0x38
+#define IRQSTAT_D_CHARGE_TIMEOUT_STAT BIT(2)
+#define IRQSTAT_D_CHARGE_TIMEOUT_IRQ BIT(3)
+#define IRQSTAT_E 0x39
+#define IRQSTAT_E_USBIN_UV_STAT BIT(0)
+#define IRQSTAT_E_USBIN_UV_IRQ BIT(1)
+#define IRQSTAT_E_DCIN_UV_STAT BIT(4)
+#define IRQSTAT_E_DCIN_UV_IRQ BIT(5)
+#define IRQSTAT_F 0x3a
+
+/* Status registers */
+#define STAT_A 0x3b
+#define STAT_A_FLOAT_VOLTAGE_MASK 0x3f
+#define STAT_B 0x3c
+#define STAT_C 0x3d
+#define STAT_C_CHG_ENABLED BIT(0)
+#define STAT_C_HOLDOFF_STAT BIT(3)
+#define STAT_C_CHG_MASK 0x06
+#define STAT_C_CHG_SHIFT 1
+#define STAT_C_CHG_TERM BIT(5)
+#define STAT_C_CHARGER_ERROR BIT(6)
+#define STAT_E 0x3f
+
+#define SMB347_MAX_REGISTER 0x3f
+
+/**
+ * struct smb347_charger - smb347 charger instance
+ * @lock: protects concurrent access to online variables
+ * @dev: pointer to device
+ * @regmap: pointer to driver regmap
+ * @mains: power_supply instance for AC/DC power
+ * @usb: power_supply instance for USB power
+ * @battery: power_supply instance for battery
+ * @mains_online: is AC/DC input connected
+ * @usb_online: is USB input connected
+ * @charging_enabled: is charging enabled
+ * @pdata: pointer to platform data
+ */
+struct smb347_charger {
+ struct mutex lock;
+ struct device *dev;
+ struct regmap *regmap;
+ struct power_supply *mains;
+ struct power_supply *usb;
+ struct power_supply *battery;
+ bool mains_online;
+ bool usb_online;
+ bool charging_enabled;
+ const struct smb347_charger_platform_data *pdata;
+};
+
+/* Fast charge current in uA */
+static const unsigned int fcc_tbl[] = {
+ 700000,
+ 900000,
+ 1200000,
+ 1500000,
+ 1800000,
+ 2000000,
+ 2200000,
+ 2500000,
+};
+
+/* Pre-charge current in uA */
+static const unsigned int pcc_tbl[] = {
+ 100000,
+ 150000,
+ 200000,
+ 250000,
+};
+
+/* Termination current in uA */
+static const unsigned int tc_tbl[] = {
+ 37500,
+ 50000,
+ 100000,
+ 150000,
+ 200000,
+ 250000,
+ 500000,
+ 600000,
+};
+
+/* Input current limit in uA */
+static const unsigned int icl_tbl[] = {
+ 300000,
+ 500000,
+ 700000,
+ 900000,
+ 1200000,
+ 1500000,
+ 1800000,
+ 2000000,
+ 2200000,
+ 2500000,
+};
+
+/* Charge current compensation in uA */
+static const unsigned int ccc_tbl[] = {
+ 250000,
+ 700000,
+ 900000,
+ 1200000,
+};
+
+/* Convert register value to current using lookup table */
+static int hw_to_current(const unsigned int *tbl, size_t size, unsigned int val)
+{
+ if (val >= size)
+ return -EINVAL;
+ return tbl[val];
+}
+
+/* Convert current to register value using lookup table */
+static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)
+{
+ size_t i;
+
+ for (i = 0; i < size; i++)
+ if (val < tbl[i])
+ break;
+ return i > 0 ? i - 1 : -EINVAL;
+}
+
+/**
+ * smb347_update_ps_status - refreshes the power source status
+ * @smb: pointer to smb347 charger instance
+ *
+ * Function checks whether any power source is connected to the charger and
+ * updates internal state accordingly. If there is a change to previous state
+ * function returns %1, otherwise %0 and negative errno in case of errror.
+ */
+static int smb347_update_ps_status(struct smb347_charger *smb)
+{
+ bool usb = false;
+ bool dc = false;
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(smb->regmap, IRQSTAT_E, &val);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Dc and usb are set depending on whether they are enabled in
+ * platform data _and_ whether corresponding undervoltage is set.
+ */
+ if (smb->pdata->use_mains)
+ dc = !(val & IRQSTAT_E_DCIN_UV_STAT);
+ if (smb->pdata->use_usb)
+ usb = !(val & IRQSTAT_E_USBIN_UV_STAT);
+
+ mutex_lock(&smb->lock);
+ ret = smb->mains_online != dc || smb->usb_online != usb;
+ smb->mains_online = dc;
+ smb->usb_online = usb;
+ mutex_unlock(&smb->lock);
+
+ return ret;
+}
+
+/*
+ * smb347_is_ps_online - returns whether input power source is connected
+ * @smb: pointer to smb347 charger instance
+ *
+ * Returns %true if input power source is connected. Note that this is
+ * dependent on what platform has configured for usable power sources. For
+ * example if USB is disabled, this will return %false even if the USB cable
+ * is connected.
+ */
+static bool smb347_is_ps_online(struct smb347_charger *smb)
+{
+ bool ret;
+
+ mutex_lock(&smb->lock);
+ ret = smb->usb_online || smb->mains_online;
+ mutex_unlock(&smb->lock);
+
+ return ret;
+}
+
+/**
+ * smb347_charging_status - returns status of charging
+ * @smb: pointer to smb347 charger instance
+ *
+ * Function returns charging status. %0 means no charging is in progress,
+ * %1 means pre-charging, %2 fast-charging and %3 taper-charging.
+ */
+static int smb347_charging_status(struct smb347_charger *smb)
+{
+ unsigned int val;
+ int ret;
+
+ if (!smb347_is_ps_online(smb))
+ return 0;
+
+ ret = regmap_read(smb->regmap, STAT_C, &val);
+ if (ret < 0)
+ return 0;
+
+ return (val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT;
+}
+
+static int smb347_charging_set(struct smb347_charger *smb, bool enable)
+{
+ int ret = 0;
+
+ if (smb->pdata->enable_control != SMB347_CHG_ENABLE_SW) {
+ dev_dbg(smb->dev, "charging enable/disable in SW disabled\n");
+ return 0;
+ }
+
+ mutex_lock(&smb->lock);
+ if (smb->charging_enabled != enable) {
+ ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED,
+ enable ? CMD_A_CHG_ENABLED : 0);
+ if (!ret)
+ smb->charging_enabled = enable;
+ }
+ mutex_unlock(&smb->lock);
+ return ret;
+}
+
+static inline int smb347_charging_enable(struct smb347_charger *smb)
+{
+ return smb347_charging_set(smb, true);
+}
+
+static inline int smb347_charging_disable(struct smb347_charger *smb)
+{
+ return smb347_charging_set(smb, false);
+}
+
+static int smb347_start_stop_charging(struct smb347_charger *smb)
+{
+ int ret;
+
+ /*
+ * Depending on whether valid power source is connected or not, we
+ * disable or enable the charging. We do it manually because it
+ * depends on how the platform has configured the valid inputs.
+ */
+ if (smb347_is_ps_online(smb)) {
+ ret = smb347_charging_enable(smb);
+ if (ret < 0)
+ dev_err(smb->dev, "failed to enable charging\n");
+ } else {
+ ret = smb347_charging_disable(smb);
+ if (ret < 0)
+ dev_err(smb->dev, "failed to disable charging\n");
+ }
+
+ return ret;
+}
+
+static int smb347_set_charge_current(struct smb347_charger *smb)
+{
+ int ret;
+
+ if (smb->pdata->max_charge_current) {
+ ret = current_to_hw(fcc_tbl, ARRAY_SIZE(fcc_tbl),
+ smb->pdata->max_charge_current);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
+ CFG_CHARGE_CURRENT_FCC_MASK,
+ ret << CFG_CHARGE_CURRENT_FCC_SHIFT);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (smb->pdata->pre_charge_current) {
+ ret = current_to_hw(pcc_tbl, ARRAY_SIZE(pcc_tbl),
+ smb->pdata->pre_charge_current);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
+ CFG_CHARGE_CURRENT_PCC_MASK,
+ ret << CFG_CHARGE_CURRENT_PCC_SHIFT);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (smb->pdata->termination_current) {
+ ret = current_to_hw(tc_tbl, ARRAY_SIZE(tc_tbl),
+ smb->pdata->termination_current);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
+ CFG_CHARGE_CURRENT_TC_MASK, ret);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int smb347_set_current_limits(struct smb347_charger *smb)
+{
+ int ret;
+
+ if (smb->pdata->mains_current_limit) {
+ ret = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
+ smb->pdata->mains_current_limit);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
+ CFG_CURRENT_LIMIT_DC_MASK,
+ ret << CFG_CURRENT_LIMIT_DC_SHIFT);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (smb->pdata->usb_hc_current_limit) {
+ ret = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
+ smb->pdata->usb_hc_current_limit);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
+ CFG_CURRENT_LIMIT_USB_MASK, ret);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int smb347_set_voltage_limits(struct smb347_charger *smb)
+{
+ int ret;
+
+ if (smb->pdata->pre_to_fast_voltage) {
+ ret = smb->pdata->pre_to_fast_voltage;
+
+ /* uV */
+ ret = clamp_val(ret, 2400000, 3000000) - 2400000;
+ ret /= 200000;
+
+ ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
+ CFG_FLOAT_VOLTAGE_THRESHOLD_MASK,
+ ret << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (smb->pdata->max_charge_voltage) {
+ ret = smb->pdata->max_charge_voltage;
+
+ /* uV */
+ ret = clamp_val(ret, 3500000, 4500000) - 3500000;
+ ret /= 20000;
+
+ ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
+ CFG_FLOAT_VOLTAGE_FLOAT_MASK, ret);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int smb347_set_temp_limits(struct smb347_charger *smb)
+{
+ bool enable_therm_monitor = false;
+ int ret = 0;
+ int val;
+
+ if (smb->pdata->chip_temp_threshold) {
+ val = smb->pdata->chip_temp_threshold;
+
+ /* degree C */
+ val = clamp_val(val, 100, 130) - 100;
+ val /= 10;
+
+ ret = regmap_update_bits(smb->regmap, CFG_OTG,
+ CFG_OTG_TEMP_THRESHOLD_MASK,
+ val << CFG_OTG_TEMP_THRESHOLD_SHIFT);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (smb->pdata->soft_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
+ val = smb->pdata->soft_cold_temp_limit;
+
+ val = clamp_val(val, 0, 15);
+ val /= 5;
+ /* this goes from higher to lower so invert the value */
+ val = ~val & 0x3;
+
+ ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
+ CFG_TEMP_LIMIT_SOFT_COLD_MASK,
+ val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT);
+ if (ret < 0)
+ return ret;
+
+ enable_therm_monitor = true;
+ }
+
+ if (smb->pdata->soft_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
+ val = smb->pdata->soft_hot_temp_limit;
+
+ val = clamp_val(val, 40, 55) - 40;
+ val /= 5;
+
+ ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
+ CFG_TEMP_LIMIT_SOFT_HOT_MASK,
+ val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT);
+ if (ret < 0)
+ return ret;
+
+ enable_therm_monitor = true;
+ }
+
+ if (smb->pdata->hard_cold_temp_limit != SMB347_TEMP_USE_DEFAULT) {
+ val = smb->pdata->hard_cold_temp_limit;
+
+ val = clamp_val(val, -5, 10) + 5;
+ val /= 5;
+ /* this goes from higher to lower so invert the value */
+ val = ~val & 0x3;
+
+ ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
+ CFG_TEMP_LIMIT_HARD_COLD_MASK,
+ val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT);
+ if (ret < 0)
+ return ret;
+
+ enable_therm_monitor = true;
+ }
+
+ if (smb->pdata->hard_hot_temp_limit != SMB347_TEMP_USE_DEFAULT) {
+ val = smb->pdata->hard_hot_temp_limit;
+
+ val = clamp_val(val, 50, 65) - 50;
+ val /= 5;
+
+ ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
+ CFG_TEMP_LIMIT_HARD_HOT_MASK,
+ val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT);
+ if (ret < 0)
+ return ret;
+
+ enable_therm_monitor = true;
+ }
+
+ /*
+ * If any of the temperature limits are set, we also enable the
+ * thermistor monitoring.
+ *
+ * When soft limits are hit, the device will start to compensate
+ * current and/or voltage depending on the configuration.
+ *
+ * When hard limit is hit, the device will suspend charging
+ * depending on the configuration.
+ */
+ if (enable_therm_monitor) {
+ ret = regmap_update_bits(smb->regmap, CFG_THERM,
+ CFG_THERM_MONITOR_DISABLED, 0);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (smb->pdata->suspend_on_hard_temp_limit) {
+ ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
+ CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED, 0);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (smb->pdata->soft_temp_limit_compensation !=
+ SMB347_SOFT_TEMP_COMPENSATE_DEFAULT) {
+ val = smb->pdata->soft_temp_limit_compensation & 0x3;
+
+ ret = regmap_update_bits(smb->regmap, CFG_THERM,
+ CFG_THERM_SOFT_HOT_COMPENSATION_MASK,
+ val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(smb->regmap, CFG_THERM,
+ CFG_THERM_SOFT_COLD_COMPENSATION_MASK,
+ val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (smb->pdata->charge_current_compensation) {
+ val = current_to_hw(ccc_tbl, ARRAY_SIZE(ccc_tbl),
+ smb->pdata->charge_current_compensation);
+ if (val < 0)
+ return val;
+
+ ret = regmap_update_bits(smb->regmap, CFG_OTG,
+ CFG_OTG_CC_COMPENSATION_MASK,
+ (val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT);
+ if (ret < 0)
+ return ret;
+ }
+
+ return ret;
+}
+
+/*
+ * smb347_set_writable - enables/disables writing to non-volatile registers
+ * @smb: pointer to smb347 charger instance
+ *
+ * You can enable/disable writing to the non-volatile configuration
+ * registers by calling this function.
+ *
+ * Returns %0 on success and negative errno in case of failure.
+ */
+static int smb347_set_writable(struct smb347_charger *smb, bool writable)
+{
+ return regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE,
+ writable ? CMD_A_ALLOW_WRITE : 0);
+}
+
+static int smb347_hw_init(struct smb347_charger *smb)
+{
+ unsigned int val;
+ int ret;
+
+ ret = smb347_set_writable(smb, true);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Program the platform specific configuration values to the device
+ * first.
+ */
+ ret = smb347_set_charge_current(smb);
+ if (ret < 0)
+ goto fail;
+
+ ret = smb347_set_current_limits(smb);
+ if (ret < 0)
+ goto fail;
+
+ ret = smb347_set_voltage_limits(smb);
+ if (ret < 0)
+ goto fail;
+
+ ret = smb347_set_temp_limits(smb);
+ if (ret < 0)
+ goto fail;
+
+ /* If USB charging is disabled we put the USB in suspend mode */
+ if (!smb->pdata->use_usb) {
+ ret = regmap_update_bits(smb->regmap, CMD_A,
+ CMD_A_SUSPEND_ENABLED,
+ CMD_A_SUSPEND_ENABLED);
+ if (ret < 0)
+ goto fail;
+ }
+
+ /*
+ * If configured by platform data, we enable hardware Auto-OTG
+ * support for driving VBUS. Otherwise we disable it.
+ */
+ ret = regmap_update_bits(smb->regmap, CFG_OTHER, CFG_OTHER_RID_MASK,
+ smb->pdata->use_usb_otg ? CFG_OTHER_RID_ENABLED_AUTO_OTG : 0);
+ if (ret < 0)
+ goto fail;
+
+ /*
+ * Make the charging functionality controllable by a write to the
+ * command register unless pin control is specified in the platform
+ * data.
+ */
+ switch (smb->pdata->enable_control) {
+ case SMB347_CHG_ENABLE_PIN_ACTIVE_LOW:
+ val = CFG_PIN_EN_CTRL_ACTIVE_LOW;
+ break;
+ case SMB347_CHG_ENABLE_PIN_ACTIVE_HIGH:
+ val = CFG_PIN_EN_CTRL_ACTIVE_HIGH;
+ break;
+ default:
+ val = 0;
+ break;
+ }
+
+ ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL_MASK,
+ val);
+ if (ret < 0)
+ goto fail;
+
+ /* Disable Automatic Power Source Detection (APSD) interrupt. */
+ ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_APSD_IRQ, 0);
+ if (ret < 0)
+ goto fail;
+
+ ret = smb347_update_ps_status(smb);
+ if (ret < 0)
+ goto fail;
+
+ ret = smb347_start_stop_charging(smb);
+
+fail:
+ smb347_set_writable(smb, false);
+ return ret;
+}
+
+static irqreturn_t smb347_interrupt(int irq, void *data)
+{
+ struct smb347_charger *smb = data;
+ unsigned int stat_c, irqstat_c, irqstat_d, irqstat_e;
+ bool handled = false;
+ int ret;
+
+ ret = regmap_read(smb->regmap, STAT_C, &stat_c);
+ if (ret < 0) {
+ dev_warn(smb->dev, "reading STAT_C failed\n");
+ return IRQ_NONE;
+ }
+
+ ret = regmap_read(smb->regmap, IRQSTAT_C, &irqstat_c);
+ if (ret < 0) {
+ dev_warn(smb->dev, "reading IRQSTAT_C failed\n");
+ return IRQ_NONE;
+ }
+
+ ret = regmap_read(smb->regmap, IRQSTAT_D, &irqstat_d);
+ if (ret < 0) {
+ dev_warn(smb->dev, "reading IRQSTAT_D failed\n");
+ return IRQ_NONE;
+ }
+
+ ret = regmap_read(smb->regmap, IRQSTAT_E, &irqstat_e);
+ if (ret < 0) {
+ dev_warn(smb->dev, "reading IRQSTAT_E failed\n");
+ return IRQ_NONE;
+ }
+
+ /*
+ * If we get charger error we report the error back to user.
+ * If the error is recovered charging will resume again.
+ */
+ if (stat_c & STAT_C_CHARGER_ERROR) {
+ dev_err(smb->dev, "charging stopped due to charger error\n");
+ power_supply_changed(smb->battery);
+ handled = true;
+ }
+
+ /*
+ * If we reached the termination current the battery is charged and
+ * we can update the status now. Charging is automatically
+ * disabled by the hardware.
+ */
+ if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {
+ if (irqstat_c & IRQSTAT_C_TERMINATION_STAT)
+ power_supply_changed(smb->battery);
+ dev_dbg(smb->dev, "going to HW maintenance mode\n");
+ handled = true;
+ }
+
+ /*
+ * If we got a charger timeout INT that means the charge
+ * full is not detected with in charge timeout value.
+ */
+ if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_IRQ) {
+ dev_dbg(smb->dev, "total Charge Timeout INT received\n");
+
+ if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_STAT)
+ dev_warn(smb->dev, "charging stopped due to timeout\n");
+ power_supply_changed(smb->battery);
+ handled = true;
+ }
+
+ /*
+ * If we got an under voltage interrupt it means that AC/USB input
+ * was connected or disconnected.
+ */
+ if (irqstat_e & (IRQSTAT_E_USBIN_UV_IRQ | IRQSTAT_E_DCIN_UV_IRQ)) {
+ if (smb347_update_ps_status(smb) > 0) {
+ smb347_start_stop_charging(smb);
+ if (smb->pdata->use_mains)
+ power_supply_changed(smb->mains);
+ if (smb->pdata->use_usb)
+ power_supply_changed(smb->usb);
+ }
+ handled = true;
+ }
+
+ return handled ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static int smb347_irq_set(struct smb347_charger *smb, bool enable)
+{
+ int ret;
+
+ ret = smb347_set_writable(smb, true);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Enable/disable interrupts for:
+ * - under voltage
+ * - termination current reached
+ * - charger timeout
+ * - charger error
+ */
+ ret = regmap_update_bits(smb->regmap, CFG_FAULT_IRQ, 0xff,
+ enable ? CFG_FAULT_IRQ_DCIN_UV : 0);
+ if (ret < 0)
+ goto fail;
+
+ ret = regmap_update_bits(smb->regmap, CFG_STATUS_IRQ, 0xff,
+ enable ? (CFG_STATUS_IRQ_TERMINATION_OR_TAPER |
+ CFG_STATUS_IRQ_CHARGE_TIMEOUT) : 0);
+ if (ret < 0)
+ goto fail;
+
+ ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CHARGER_ERROR,
+ enable ? CFG_PIN_EN_CHARGER_ERROR : 0);
+fail:
+ smb347_set_writable(smb, false);
+ return ret;
+}
+
+static inline int smb347_irq_enable(struct smb347_charger *smb)
+{
+ return smb347_irq_set(smb, true);
+}
+
+static inline int smb347_irq_disable(struct smb347_charger *smb)
+{
+ return smb347_irq_set(smb, false);
+}
+
+static int smb347_irq_init(struct smb347_charger *smb,
+ struct i2c_client *client)
+{
+ const struct smb347_charger_platform_data *pdata = smb->pdata;
+ int ret, irq = gpio_to_irq(pdata->irq_gpio);
+
+ ret = gpio_request_one(pdata->irq_gpio, GPIOF_IN, client->name);
+ if (ret < 0)
+ goto fail;
+
+ ret = request_threaded_irq(irq, NULL, smb347_interrupt,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ client->name, smb);
+ if (ret < 0)
+ goto fail_gpio;
+
+ ret = smb347_set_writable(smb, true);
+ if (ret < 0)
+ goto fail_irq;
+
+ /*
+ * Configure the STAT output to be suitable for interrupts: disable
+ * all other output (except interrupts) and make it active low.
+ */
+ ret = regmap_update_bits(smb->regmap, CFG_STAT,
+ CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED,
+ CFG_STAT_DISABLED);
+ if (ret < 0)
+ goto fail_readonly;
+
+ smb347_set_writable(smb, false);
+ client->irq = irq;
+ return 0;
+
+fail_readonly:
+ smb347_set_writable(smb, false);
+fail_irq:
+ free_irq(irq, smb);
+fail_gpio:
+ gpio_free(pdata->irq_gpio);
+fail:
+ client->irq = 0;
+ return ret;
+}
+
+/*
+ * Returns the constant charge current programmed
+ * into the charger in uA.
+ */
+static int get_const_charge_current(struct smb347_charger *smb)
+{
+ int ret, intval;
+ unsigned int v;
+
+ if (!smb347_is_ps_online(smb))
+ return -ENODATA;
+
+ ret = regmap_read(smb->regmap, STAT_B, &v);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * The current value is composition of FCC and PCC values
+ * and we can detect which table to use from bit 5.
+ */
+ if (v & 0x20) {
+ intval = hw_to_current(fcc_tbl, ARRAY_SIZE(fcc_tbl), v & 7);
+ } else {
+ v >>= 3;
+ intval = hw_to_current(pcc_tbl, ARRAY_SIZE(pcc_tbl), v & 7);
+ }
+
+ return intval;
+}
+
+/*
+ * Returns the constant charge voltage programmed
+ * into the charger in uV.
+ */
+static int get_const_charge_voltage(struct smb347_charger *smb)
+{
+ int ret, intval;
+ unsigned int v;
+
+ if (!smb347_is_ps_online(smb))
+ return -ENODATA;
+
+ ret = regmap_read(smb->regmap, STAT_A, &v);
+ if (ret < 0)
+ return ret;
+
+ v &= STAT_A_FLOAT_VOLTAGE_MASK;
+ if (v > 0x3d)
+ v = 0x3d;
+
+ intval = 3500000 + v * 20000;
+
+ return intval;
+}
+
+static int smb347_mains_get_property(struct power_supply *psy,
+ enum power_supply_property prop,
+ union power_supply_propval *val)
+{
+ struct smb347_charger *smb = power_supply_get_drvdata(psy);
+ int ret;
+
+ switch (prop) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = smb->mains_online;
+ break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ ret = get_const_charge_voltage(smb);
+ if (ret < 0)
+ return ret;
+ else
+ val->intval = ret;
+ break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ ret = get_const_charge_current(smb);
+ if (ret < 0)
+ return ret;
+ else
+ val->intval = ret;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static enum power_supply_property smb347_mains_properties[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+};
+
+static int smb347_usb_get_property(struct power_supply *psy,
+ enum power_supply_property prop,
+ union power_supply_propval *val)
+{
+ struct smb347_charger *smb = power_supply_get_drvdata(psy);
+ int ret;
+
+ switch (prop) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = smb->usb_online;
+ break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ ret = get_const_charge_voltage(smb);
+ if (ret < 0)
+ return ret;
+ else
+ val->intval = ret;
+ break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ ret = get_const_charge_current(smb);
+ if (ret < 0)
+ return ret;
+ else
+ val->intval = ret;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static enum power_supply_property smb347_usb_properties[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+};
+
+static int smb347_get_charging_status(struct smb347_charger *smb)
+{
+ int ret, status;
+ unsigned int val;
+
+ if (!smb347_is_ps_online(smb))
+ return POWER_SUPPLY_STATUS_DISCHARGING;
+
+ ret = regmap_read(smb->regmap, STAT_C, &val);
+ if (ret < 0)
+ return ret;
+
+ if ((val & STAT_C_CHARGER_ERROR) ||
+ (val & STAT_C_HOLDOFF_STAT)) {
+ /*
+ * set to NOT CHARGING upon charger error
+ * or charging has stopped.
+ */
+ status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ } else {
+ if ((val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT) {
+ /*
+ * set to charging if battery is in pre-charge,
+ * fast charge or taper charging mode.
+ */
+ status = POWER_SUPPLY_STATUS_CHARGING;
+ } else if (val & STAT_C_CHG_TERM) {
+ /*
+ * set the status to FULL if battery is not in pre
+ * charge, fast charge or taper charging mode AND
+ * charging is terminated at least once.
+ */
+ status = POWER_SUPPLY_STATUS_FULL;
+ } else {
+ /*
+ * in this case no charger error or termination
+ * occured but charging is not in progress!!!
+ */
+ status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ }
+ }
+
+ return status;
+}
+
+static int smb347_battery_get_property(struct power_supply *psy,
+ enum power_supply_property prop,
+ union power_supply_propval *val)
+{
+ struct smb347_charger *smb = power_supply_get_drvdata(psy);
+ const struct smb347_charger_platform_data *pdata = smb->pdata;
+ int ret;
+
+ ret = smb347_update_ps_status(smb);
+ if (ret < 0)
+ return ret;
+
+ switch (prop) {
+ case POWER_SUPPLY_PROP_STATUS:
+ ret = smb347_get_charging_status(smb);
+ if (ret < 0)
+ return ret;
+ val->intval = ret;
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_TYPE:
+ if (!smb347_is_ps_online(smb))
+ return -ENODATA;
+
+ /*
+ * We handle trickle and pre-charging the same, and taper
+ * and none the same.
+ */
+ switch (smb347_charging_status(smb)) {
+ case 1:
+ val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
+ break;
+ case 2:
+ val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
+ break;
+ default:
+ val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
+ break;
+ }
+ break;
+
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = pdata->battery_info.technology;
+ break;
+
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ val->intval = pdata->battery_info.voltage_min_design;
+ break;
+
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+ val->intval = pdata->battery_info.voltage_max_design;
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ val->intval = pdata->battery_info.charge_full_design;
+ break;
+
+ case POWER_SUPPLY_PROP_MODEL_NAME:
+ val->strval = pdata->battery_info.name;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static enum power_supply_property smb347_battery_properties[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_CHARGE_TYPE,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+ POWER_SUPPLY_PROP_MODEL_NAME,
+};
+
+static bool smb347_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case IRQSTAT_A:
+ case IRQSTAT_C:
+ case IRQSTAT_E:
+ case IRQSTAT_F:
+ case STAT_A:
+ case STAT_B:
+ case STAT_C:
+ case STAT_E:
+ return true;
+ }
+
+ return false;
+}
+
+static bool smb347_readable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case CFG_CHARGE_CURRENT:
+ case CFG_CURRENT_LIMIT:
+ case CFG_FLOAT_VOLTAGE:
+ case CFG_STAT:
+ case CFG_PIN:
+ case CFG_THERM:
+ case CFG_SYSOK:
+ case CFG_OTHER:
+ case CFG_OTG:
+ case CFG_TEMP_LIMIT:
+ case CFG_FAULT_IRQ:
+ case CFG_STATUS_IRQ:
+ case CFG_ADDRESS:
+ case CMD_A:
+ case CMD_B:
+ case CMD_C:
+ return true;
+ }
+
+ return smb347_volatile_reg(dev, reg);
+}
+
+static const struct regmap_config smb347_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = SMB347_MAX_REGISTER,
+ .volatile_reg = smb347_volatile_reg,
+ .readable_reg = smb347_readable_reg,
+};
+
+static const struct power_supply_desc smb347_mains_desc = {
+ .name = "smb347-mains",
+ .type = POWER_SUPPLY_TYPE_MAINS,
+ .get_property = smb347_mains_get_property,
+ .properties = smb347_mains_properties,
+ .num_properties = ARRAY_SIZE(smb347_mains_properties),
+};
+
+static const struct power_supply_desc smb347_usb_desc = {
+ .name = "smb347-usb",
+ .type = POWER_SUPPLY_TYPE_USB,
+ .get_property = smb347_usb_get_property,
+ .properties = smb347_usb_properties,
+ .num_properties = ARRAY_SIZE(smb347_usb_properties),
+};
+
+static const struct power_supply_desc smb347_battery_desc = {
+ .name = "smb347-battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .get_property = smb347_battery_get_property,
+ .properties = smb347_battery_properties,
+ .num_properties = ARRAY_SIZE(smb347_battery_properties),
+};
+
+static int smb347_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ static char *battery[] = { "smb347-battery" };
+ const struct smb347_charger_platform_data *pdata;
+ struct power_supply_config mains_usb_cfg = {}, battery_cfg = {};
+ struct device *dev = &client->dev;
+ struct smb347_charger *smb;
+ int ret;
+
+ pdata = dev->platform_data;
+ if (!pdata)
+ return -EINVAL;
+
+ if (!pdata->use_mains && !pdata->use_usb)
+ return -EINVAL;
+
+ smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);
+ if (!smb)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, smb);
+
+ mutex_init(&smb->lock);
+ smb->dev = &client->dev;
+ smb->pdata = pdata;
+
+ smb->regmap = devm_regmap_init_i2c(client, &smb347_regmap);
+ if (IS_ERR(smb->regmap))
+ return PTR_ERR(smb->regmap);
+
+ ret = smb347_hw_init(smb);
+ if (ret < 0)
+ return ret;
+
+ mains_usb_cfg.supplied_to = battery;
+ mains_usb_cfg.num_supplicants = ARRAY_SIZE(battery);
+ mains_usb_cfg.drv_data = smb;
+ if (smb->pdata->use_mains) {
+ smb->mains = power_supply_register(dev, &smb347_mains_desc,
+ &mains_usb_cfg);
+ if (IS_ERR(smb->mains))
+ return PTR_ERR(smb->mains);
+ }
+
+ if (smb->pdata->use_usb) {
+ smb->usb = power_supply_register(dev, &smb347_usb_desc,
+ &mains_usb_cfg);
+ if (IS_ERR(smb->usb)) {
+ if (smb->pdata->use_mains)
+ power_supply_unregister(smb->mains);
+ return PTR_ERR(smb->usb);
+ }
+ }
+
+ battery_cfg.drv_data = smb;
+ smb->battery = power_supply_register(dev, &smb347_battery_desc,
+ &battery_cfg);
+ if (IS_ERR(smb->battery)) {
+ if (smb->pdata->use_usb)
+ power_supply_unregister(smb->usb);
+ if (smb->pdata->use_mains)
+ power_supply_unregister(smb->mains);
+ return PTR_ERR(smb->battery);
+ }
+
+ /*
+ * Interrupt pin is optional. If it is connected, we setup the
+ * interrupt support here.
+ */
+ if (pdata->irq_gpio >= 0) {
+ ret = smb347_irq_init(smb, client);
+ if (ret < 0) {
+ dev_warn(dev, "failed to initialize IRQ: %d\n", ret);
+ dev_warn(dev, "disabling IRQ support\n");
+ } else {
+ smb347_irq_enable(smb);
+ }
+ }
+
+ return 0;
+}
+
+static int smb347_remove(struct i2c_client *client)
+{
+ struct smb347_charger *smb = i2c_get_clientdata(client);
+
+ if (client->irq) {
+ smb347_irq_disable(smb);
+ free_irq(client->irq, smb);
+ gpio_free(smb->pdata->irq_gpio);
+ }
+
+ power_supply_unregister(smb->battery);
+ if (smb->pdata->use_usb)
+ power_supply_unregister(smb->usb);
+ if (smb->pdata->use_mains)
+ power_supply_unregister(smb->mains);
+ return 0;
+}
+
+static const struct i2c_device_id smb347_id[] = {
+ { "smb347", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, smb347_id);
+
+static struct i2c_driver smb347_driver = {
+ .driver = {
+ .name = "smb347",
+ },
+ .probe = smb347_probe,
+ .remove = smb347_remove,
+ .id_table = smb347_id,
+};
+
+module_i2c_driver(smb347_driver);
+
+MODULE_AUTHOR("Bruce E. Robertson <bruce.e.robertson@intel.com>");
+MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
+MODULE_DESCRIPTION("SMB347 battery charger driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("i2c:smb347");