--- /dev/null
+/*
+ * 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/debugfs.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/seq_file.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_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_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_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_CHG_MASK 0x06
+#define STAT_C_CHG_SHIFT 1
+#define STAT_C_CHARGER_ERROR BIT(6)
+#define STAT_E 0x3f
+
+/**
+ * struct smb347_charger - smb347 charger instance
+ * @lock: protects concurrent access to online variables
+ * @client: pointer to i2c client
+ * @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
+ * @dentry: for debugfs
+ * @pdata: pointer to platform data
+ */
+struct smb347_charger {
+ struct mutex lock;
+ struct i2c_client *client;
+ struct power_supply mains;
+ struct power_supply usb;
+ struct power_supply battery;
+ bool mains_online;
+ bool usb_online;
+ bool charging_enabled;
+ struct dentry *dentry;
+ 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;
+}
+
+static int smb347_read(struct smb347_charger *smb, u8 reg)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(smb->client, reg);
+ if (ret < 0)
+ dev_warn(&smb->client->dev, "failed to read reg 0x%x: %d\n",
+ reg, ret);
+ return ret;
+}
+
+static int smb347_write(struct smb347_charger *smb, u8 reg, u8 val)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(smb->client, reg, val);
+ if (ret < 0)
+ dev_warn(&smb->client->dev, "failed to write reg 0x%x: %d\n",
+ reg, ret);
+ return ret;
+}
+
+/**
+ * smb347_update_status - updates the charging status
+ * @smb: pointer to smb347 charger instance
+ *
+ * Function checks status of the charging and updates internal state
+ * accordingly. Returns %0 if there is no change in status, %1 if the
+ * status has changed and negative errno in case of failure.
+ */
+static int smb347_update_status(struct smb347_charger *smb)
+{
+ bool usb = false;
+ bool dc = false;
+ int ret;
+
+ ret = smb347_read(smb, IRQSTAT_E);
+ 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 = !(ret & IRQSTAT_E_DCIN_UV_STAT);
+ if (smb->pdata->use_usb)
+ usb = !(ret & 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_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_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)
+{
+ int ret;
+
+ if (!smb347_is_online(smb))
+ return 0;
+
+ ret = smb347_read(smb, STAT_C);
+ if (ret < 0)
+ return 0;
+
+ return (ret & 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->client->dev,
+ "charging enable/disable in SW disabled\n");
+ return 0;
+ }
+
+ mutex_lock(&smb->lock);
+ if (smb->charging_enabled != enable) {
+ ret = smb347_read(smb, CMD_A);
+ if (ret < 0)
+ goto out;
+
+ smb->charging_enabled = enable;
+
+ if (enable)
+ ret |= CMD_A_CHG_ENABLED;
+ else
+ ret &= ~CMD_A_CHG_ENABLED;
+
+ ret = smb347_write(smb, CMD_A, ret);
+ }
+out:
+ 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_update_online(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_online(smb)) {
+ ret = smb347_charging_enable(smb);
+ if (ret < 0)
+ dev_err(&smb->client->dev,
+ "failed to enable charging\n");
+ } else {
+ ret = smb347_charging_disable(smb);
+ if (ret < 0)
+ dev_err(&smb->client->dev,
+ "failed to disable charging\n");
+ }
+
+ return ret;
+}
+
+static int smb347_set_charge_current(struct smb347_charger *smb)
+{
+ int ret, val;
+
+ ret = smb347_read(smb, CFG_CHARGE_CURRENT);
+ if (ret < 0)
+ return ret;
+
+ if (smb->pdata->max_charge_current) {
+ val = current_to_hw(fcc_tbl, ARRAY_SIZE(fcc_tbl),
+ smb->pdata->max_charge_current);
+ if (val < 0)
+ return val;
+
+ ret &= ~CFG_CHARGE_CURRENT_FCC_MASK;
+ ret |= val << CFG_CHARGE_CURRENT_FCC_SHIFT;
+ }
+
+ if (smb->pdata->pre_charge_current) {
+ val = current_to_hw(pcc_tbl, ARRAY_SIZE(pcc_tbl),
+ smb->pdata->pre_charge_current);
+ if (val < 0)
+ return val;
+
+ ret &= ~CFG_CHARGE_CURRENT_PCC_MASK;
+ ret |= val << CFG_CHARGE_CURRENT_PCC_SHIFT;
+ }
+
+ if (smb->pdata->termination_current) {
+ val = current_to_hw(tc_tbl, ARRAY_SIZE(tc_tbl),
+ smb->pdata->termination_current);
+ if (val < 0)
+ return val;
+
+ ret &= ~CFG_CHARGE_CURRENT_TC_MASK;
+ ret |= val;
+ }
+
+ return smb347_write(smb, CFG_CHARGE_CURRENT, ret);
+}
+
+static int smb347_set_current_limits(struct smb347_charger *smb)
+{
+ int ret, val;
+
+ ret = smb347_read(smb, CFG_CURRENT_LIMIT);
+ if (ret < 0)
+ return ret;
+
+ if (smb->pdata->mains_current_limit) {
+ val = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
+ smb->pdata->mains_current_limit);
+ if (val < 0)
+ return val;
+
+ ret &= ~CFG_CURRENT_LIMIT_DC_MASK;
+ ret |= val << CFG_CURRENT_LIMIT_DC_SHIFT;
+ }
+
+ if (smb->pdata->usb_hc_current_limit) {
+ val = current_to_hw(icl_tbl, ARRAY_SIZE(icl_tbl),
+ smb->pdata->usb_hc_current_limit);
+ if (val < 0)
+ return val;
+
+ ret &= ~CFG_CURRENT_LIMIT_USB_MASK;
+ ret |= val;
+ }
+
+ return smb347_write(smb, CFG_CURRENT_LIMIT, ret);
+}
+
+static int smb347_set_voltage_limits(struct smb347_charger *smb)
+{
+ int ret, val;
+
+ ret = smb347_read(smb, CFG_FLOAT_VOLTAGE);
+ if (ret < 0)
+ return ret;
+
+ if (smb->pdata->pre_to_fast_voltage) {
+ val = smb->pdata->pre_to_fast_voltage;
+
+ /* uV */
+ val = clamp_val(val, 2400000, 3000000) - 2400000;
+ val /= 200000;
+
+ ret &= ~CFG_FLOAT_VOLTAGE_THRESHOLD_MASK;
+ ret |= val << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT;
+ }
+
+ if (smb->pdata->max_charge_voltage) {
+ val = smb->pdata->max_charge_voltage;
+
+ /* uV */
+ val = clamp_val(val, 3500000, 4500000) - 3500000;
+ val /= 20000;
+
+ ret |= val;
+ }
+
+ return smb347_write(smb, CFG_FLOAT_VOLTAGE, ret);
+}
+
+static int smb347_set_temp_limits(struct smb347_charger *smb)
+{
+ bool enable_therm_monitor = false;
+ int ret, 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 = smb347_read(smb, CFG_OTG);
+ if (ret < 0)
+ return ret;
+
+ ret &= ~CFG_OTG_TEMP_THRESHOLD_MASK;
+ ret |= val << CFG_OTG_TEMP_THRESHOLD_SHIFT;
+
+ ret = smb347_write(smb, CFG_OTG, ret);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = smb347_read(smb, CFG_TEMP_LIMIT);
+ 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 &= ~CFG_TEMP_LIMIT_SOFT_COLD_MASK;
+ ret |= val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT;
+
+ 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 &= ~CFG_TEMP_LIMIT_SOFT_HOT_MASK;
+ ret |= val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT;
+
+ 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 &= ~CFG_TEMP_LIMIT_HARD_COLD_MASK;
+ ret |= val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT;
+
+ 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 &= ~CFG_TEMP_LIMIT_HARD_HOT_MASK;
+ ret |= val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT;
+
+ enable_therm_monitor = true;
+ }
+
+ ret = smb347_write(smb, CFG_TEMP_LIMIT, ret);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * 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 = smb347_read(smb, CFG_THERM);
+ if (ret < 0)
+ return ret;
+
+ ret &= ~CFG_THERM_MONITOR_DISABLED;
+
+ ret = smb347_write(smb, CFG_THERM, ret);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (smb->pdata->suspend_on_hard_temp_limit) {
+ ret = smb347_read(smb, CFG_SYSOK);
+ if (ret < 0)
+ return ret;
+
+ ret &= ~CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED;
+
+ ret = smb347_write(smb, CFG_SYSOK, ret);
+ 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 = smb347_read(smb, CFG_THERM);
+ if (ret < 0)
+ return ret;
+
+ ret &= ~CFG_THERM_SOFT_HOT_COMPENSATION_MASK;
+ ret |= val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT;
+
+ ret &= ~CFG_THERM_SOFT_COLD_COMPENSATION_MASK;
+ ret |= val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT;
+
+ ret = smb347_write(smb, CFG_THERM, ret);
+ 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 = smb347_read(smb, CFG_OTG);
+ if (ret < 0)
+ return ret;
+
+ ret &= ~CFG_OTG_CC_COMPENSATION_MASK;
+ ret |= (val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT;
+
+ ret = smb347_write(smb, CFG_OTG, ret);
+ 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)
+{
+ int ret;
+
+ ret = smb347_read(smb, CMD_A);
+ if (ret < 0)
+ return ret;
+
+ if (writable)
+ ret |= CMD_A_ALLOW_WRITE;
+ else
+ ret &= ~CMD_A_ALLOW_WRITE;
+
+ return smb347_write(smb, CMD_A, ret);
+}
+
+static int smb347_hw_init(struct smb347_charger *smb)
+{
+ 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 = smb347_read(smb, CMD_A);
+ if (ret < 0)
+ goto fail;
+
+ ret |= CMD_A_SUSPEND_ENABLED;
+
+ ret = smb347_write(smb, CMD_A, ret);
+ if (ret < 0)
+ goto fail;
+ }
+
+ ret = smb347_read(smb, CFG_OTHER);
+ if (ret < 0)
+ goto fail;
+
+ /*
+ * If configured by platform data, we enable hardware Auto-OTG
+ * support for driving VBUS. Otherwise we disable it.
+ */
+ ret &= ~CFG_OTHER_RID_MASK;
+ if (smb->pdata->use_usb_otg)
+ ret |= CFG_OTHER_RID_ENABLED_AUTO_OTG;
+
+ ret = smb347_write(smb, CFG_OTHER, ret);
+ if (ret < 0)
+ goto fail;
+
+ ret = smb347_read(smb, CFG_PIN);
+ 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.
+ */
+ ret &= ~CFG_PIN_EN_CTRL_MASK;
+
+ switch (smb->pdata->enable_control) {
+ case SMB347_CHG_ENABLE_SW:
+ /* Do nothing, 0 means i2c control */
+ break;
+ case SMB347_CHG_ENABLE_PIN_ACTIVE_LOW:
+ ret |= CFG_PIN_EN_CTRL_ACTIVE_LOW;
+ break;
+ case SMB347_CHG_ENABLE_PIN_ACTIVE_HIGH:
+ ret |= CFG_PIN_EN_CTRL_ACTIVE_HIGH;
+ break;
+ }
+
+ /* Disable Automatic Power Source Detection (APSD) interrupt. */
+ ret &= ~CFG_PIN_EN_APSD_IRQ;
+
+ ret = smb347_write(smb, CFG_PIN, ret);
+ if (ret < 0)
+ goto fail;
+
+ ret = smb347_update_status(smb);
+ if (ret < 0)
+ goto fail;
+
+ ret = smb347_update_online(smb);
+
+fail:
+ smb347_set_writable(smb, false);
+ return ret;
+}
+
+static irqreturn_t smb347_interrupt(int irq, void *data)
+{
+ struct smb347_charger *smb = data;
+ int stat_c, irqstat_e, irqstat_c;
+ irqreturn_t ret = IRQ_NONE;
+
+ stat_c = smb347_read(smb, STAT_C);
+ if (stat_c < 0) {
+ dev_warn(&smb->client->dev, "reading STAT_C failed\n");
+ return IRQ_NONE;
+ }
+
+ irqstat_c = smb347_read(smb, IRQSTAT_C);
+ if (irqstat_c < 0) {
+ dev_warn(&smb->client->dev, "reading IRQSTAT_C failed\n");
+ return IRQ_NONE;
+ }
+
+ irqstat_e = smb347_read(smb, IRQSTAT_E);
+ if (irqstat_e < 0) {
+ dev_warn(&smb->client->dev, "reading IRQSTAT_E failed\n");
+ return IRQ_NONE;
+ }
+
+ /*
+ * If we get charger error we report the error back to user and
+ * disable charging.
+ */
+ if (stat_c & STAT_C_CHARGER_ERROR) {
+ dev_err(&smb->client->dev,
+ "error in charger, disabling charging\n");
+
+ smb347_charging_disable(smb);
+ power_supply_changed(&smb->battery);
+
+ ret = IRQ_HANDLED;
+ }
+
+ /*
+ * 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);
+ ret = IRQ_HANDLED;
+ }
+
+ /*
+ * 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_status(smb) > 0) {
+ smb347_update_online(smb);
+ power_supply_changed(&smb->mains);
+ power_supply_changed(&smb->usb);
+ }
+ ret = IRQ_HANDLED;
+ }
+
+ return ret;
+}
+
+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 error
+ */
+ if (enable) {
+ ret = smb347_write(smb, CFG_FAULT_IRQ, CFG_FAULT_IRQ_DCIN_UV);
+ if (ret < 0)
+ goto fail;
+
+ ret = smb347_write(smb, CFG_STATUS_IRQ,
+ CFG_STATUS_IRQ_TERMINATION_OR_TAPER);
+ if (ret < 0)
+ goto fail;
+
+ ret = smb347_read(smb, CFG_PIN);
+ if (ret < 0)
+ goto fail;
+
+ ret |= CFG_PIN_EN_CHARGER_ERROR;
+
+ ret = smb347_write(smb, CFG_PIN, ret);
+ } else {
+ ret = smb347_write(smb, CFG_FAULT_IRQ, 0);
+ if (ret < 0)
+ goto fail;
+
+ ret = smb347_write(smb, CFG_STATUS_IRQ, 0);
+ if (ret < 0)
+ goto fail;
+
+ ret = smb347_read(smb, CFG_PIN);
+ if (ret < 0)
+ goto fail;
+
+ ret &= ~CFG_PIN_EN_CHARGER_ERROR;
+
+ ret = smb347_write(smb, CFG_PIN, ret);
+ }
+
+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)
+{
+ 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, smb->client->name);
+ if (ret < 0)
+ goto fail;
+
+ ret = request_threaded_irq(irq, NULL, smb347_interrupt,
+ IRQF_TRIGGER_FALLING, smb->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 = smb347_read(smb, CFG_STAT);
+ if (ret < 0)
+ goto fail_readonly;
+
+ ret &= ~CFG_STAT_ACTIVE_HIGH;
+ ret |= CFG_STAT_DISABLED;
+
+ ret = smb347_write(smb, CFG_STAT, ret);
+ if (ret < 0)
+ goto fail_readonly;
+
+ ret = smb347_irq_enable(smb);
+ if (ret < 0)
+ goto fail_readonly;
+
+ smb347_set_writable(smb, false);
+ smb->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:
+ smb->client->irq = 0;
+ return ret;
+}
+
+static int smb347_mains_get_property(struct power_supply *psy,
+ enum power_supply_property prop,
+ union power_supply_propval *val)
+{
+ struct smb347_charger *smb =
+ container_of(psy, struct smb347_charger, mains);
+
+ if (prop == POWER_SUPPLY_PROP_ONLINE) {
+ val->intval = smb->mains_online;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static enum power_supply_property smb347_mains_properties[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+};
+
+static int smb347_usb_get_property(struct power_supply *psy,
+ enum power_supply_property prop,
+ union power_supply_propval *val)
+{
+ struct smb347_charger *smb =
+ container_of(psy, struct smb347_charger, usb);
+
+ if (prop == POWER_SUPPLY_PROP_ONLINE) {
+ val->intval = smb->usb_online;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static enum power_supply_property smb347_usb_properties[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+};
+
+static int smb347_battery_get_property(struct power_supply *psy,
+ enum power_supply_property prop,
+ union power_supply_propval *val)
+{
+ struct smb347_charger *smb =
+ container_of(psy, struct smb347_charger, battery);
+ const struct smb347_charger_platform_data *pdata = smb->pdata;
+ int ret;
+
+ ret = smb347_update_status(smb);
+ if (ret < 0)
+ return ret;
+
+ switch (prop) {
+ case POWER_SUPPLY_PROP_STATUS:
+ if (!smb347_is_online(smb)) {
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ break;
+ }
+ if (smb347_charging_status(smb))
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ else
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_TYPE:
+ if (!smb347_is_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_VOLTAGE_NOW:
+ if (!smb347_is_online(smb))
+ return -ENODATA;
+ ret = smb347_read(smb, STAT_A);
+ if (ret < 0)
+ return ret;
+
+ ret &= STAT_A_FLOAT_VOLTAGE_MASK;
+ if (ret > 0x3d)
+ ret = 0x3d;
+
+ val->intval = 3500000 + ret * 20000;
+ break;
+
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ if (!smb347_is_online(smb))
+ return -ENODATA;
+
+ ret = smb347_read(smb, STAT_B);
+ 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 (ret & 0x20) {
+ val->intval = hw_to_current(fcc_tbl,
+ ARRAY_SIZE(fcc_tbl),
+ ret & 7);
+ } else {
+ ret >>= 3;
+ val->intval = hw_to_current(pcc_tbl,
+ ARRAY_SIZE(pcc_tbl),
+ ret & 7);
+ }
+ 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_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+ POWER_SUPPLY_PROP_MODEL_NAME,
+};
+
+static int smb347_debugfs_show(struct seq_file *s, void *data)
+{
+ struct smb347_charger *smb = s->private;
+ int ret;
+ u8 reg;
+
+ seq_printf(s, "Control registers:\n");
+ seq_printf(s, "==================\n");
+ for (reg = CFG_CHARGE_CURRENT; reg <= CFG_ADDRESS; reg++) {
+ ret = smb347_read(smb, reg);
+ seq_printf(s, "0x%02x:\t0x%02x\n", reg, ret);
+ }
+ seq_printf(s, "\n");
+
+ seq_printf(s, "Command registers:\n");
+ seq_printf(s, "==================\n");
+ ret = smb347_read(smb, CMD_A);
+ seq_printf(s, "0x%02x:\t0x%02x\n", CMD_A, ret);
+ ret = smb347_read(smb, CMD_B);
+ seq_printf(s, "0x%02x:\t0x%02x\n", CMD_B, ret);
+ ret = smb347_read(smb, CMD_C);
+ seq_printf(s, "0x%02x:\t0x%02x\n", CMD_C, ret);
+ seq_printf(s, "\n");
+
+ seq_printf(s, "Interrupt status registers:\n");
+ seq_printf(s, "===========================\n");
+ for (reg = IRQSTAT_A; reg <= IRQSTAT_F; reg++) {
+ ret = smb347_read(smb, reg);
+ seq_printf(s, "0x%02x:\t0x%02x\n", reg, ret);
+ }
+ seq_printf(s, "\n");
+
+ seq_printf(s, "Status registers:\n");
+ seq_printf(s, "=================\n");
+ for (reg = STAT_A; reg <= STAT_E; reg++) {
+ ret = smb347_read(smb, reg);
+ seq_printf(s, "0x%02x:\t0x%02x\n", reg, ret);
+ }
+
+ return 0;
+}
+
+static int smb347_debugfs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, smb347_debugfs_show, inode->i_private);
+}
+
+static const struct file_operations smb347_debugfs_fops = {
+ .open = smb347_debugfs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+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 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->client = client;
+ smb->pdata = pdata;
+
+ ret = smb347_hw_init(smb);
+ if (ret < 0)
+ return ret;
+
+ smb->mains.name = "smb347-mains";
+ smb->mains.type = POWER_SUPPLY_TYPE_MAINS;
+ smb->mains.get_property = smb347_mains_get_property;
+ smb->mains.properties = smb347_mains_properties;
+ smb->mains.num_properties = ARRAY_SIZE(smb347_mains_properties);
+ smb->mains.supplied_to = battery;
+ smb->mains.num_supplicants = ARRAY_SIZE(battery);
+
+ smb->usb.name = "smb347-usb";
+ smb->usb.type = POWER_SUPPLY_TYPE_USB;
+ smb->usb.get_property = smb347_usb_get_property;
+ smb->usb.properties = smb347_usb_properties;
+ smb->usb.num_properties = ARRAY_SIZE(smb347_usb_properties);
+ smb->usb.supplied_to = battery;
+ smb->usb.num_supplicants = ARRAY_SIZE(battery);
+
+ smb->battery.name = "smb347-battery";
+ smb->battery.type = POWER_SUPPLY_TYPE_BATTERY;
+ smb->battery.get_property = smb347_battery_get_property;
+ smb->battery.properties = smb347_battery_properties;
+ smb->battery.num_properties = ARRAY_SIZE(smb347_battery_properties);
+
+ ret = power_supply_register(dev, &smb->mains);
+ if (ret < 0)
+ return ret;
+
+ ret = power_supply_register(dev, &smb->usb);
+ if (ret < 0) {
+ power_supply_unregister(&smb->mains);
+ return ret;
+ }
+
+ ret = power_supply_register(dev, &smb->battery);
+ if (ret < 0) {
+ power_supply_unregister(&smb->usb);
+ power_supply_unregister(&smb->mains);
+ return ret;
+ }
+
+ /*
+ * Interrupt pin is optional. If it is connected, we setup the
+ * interrupt support here.
+ */
+ if (pdata->irq_gpio >= 0) {
+ ret = smb347_irq_init(smb);
+ if (ret < 0) {
+ dev_warn(dev, "failed to initialize IRQ: %d\n", ret);
+ dev_warn(dev, "disabling IRQ support\n");
+ }
+ }
+
+ smb->dentry = debugfs_create_file("smb347-regs", S_IRUSR, NULL, smb,
+ &smb347_debugfs_fops);
+ return 0;
+}
+
+static int smb347_remove(struct i2c_client *client)
+{
+ struct smb347_charger *smb = i2c_get_clientdata(client);
+
+ if (!IS_ERR_OR_NULL(smb->dentry))
+ debugfs_remove(smb->dentry);
+
+ if (client->irq) {
+ smb347_irq_disable(smb);
+ free_irq(client->irq, smb);
+ gpio_free(smb->pdata->irq_gpio);
+ }
+
+ power_supply_unregister(&smb->battery);
+ power_supply_unregister(&smb->usb);
+ 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 = __devexit_p(smb347_remove),
+ .id_table = smb347_id,
+};
+
+static int __init smb347_init(void)
+{
+ return i2c_add_driver(&smb347_driver);
+}
+module_init(smb347_init);
+
+static void __exit smb347_exit(void)
+{
+ i2c_del_driver(&smb347_driver);
+}
+module_exit(smb347_exit);
+
+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");
projects / profile / ivi / kernel-adaptation-intel-automotive.git / commitdiff