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34298d40e5
linux/drivers/power/smb347-charger.c
Mika Westerberg 34298d40e5 smb347-charger: Convert to regmap API 
The smb347-charger driver does a lot of read-modify-write to the device
registers. Instead of open-coding everything we can take advantage of
regmap API which provides nice functions to do this kind of things.

In addition there is no need for custom debugfs file for dumping
registers as this is already provided by the regmap API.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
2012-05-05 05:48:17 -07:00

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/*
* 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/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_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
#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_e, irqstat_c;
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_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 and
* disable charging.
*/
if (stat_c & STAT_C_CHARGER_ERROR) {
dev_err(smb->dev, "error in charger, disabling charging\n");
smb347_charging_disable(smb);
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);
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 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 : 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, 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;
}
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;
unsigned int v;
int ret;
ret = smb347_update_ps_status(smb);
if (ret < 0)
return ret;
switch (prop) {
case POWER_SUPPLY_PROP_STATUS:
if (!smb347_is_ps_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_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_VOLTAGE_NOW:
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;
val->intval = 3500000 + v * 20000;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
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) {
val->intval = hw_to_current(fcc_tbl,
ARRAY_SIZE(fcc_tbl),
v & 7);
} else {
v >>= 3;
val->intval = hw_to_current(pcc_tbl,
ARRAY_SIZE(pcc_tbl),
v & 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 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 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->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;
if (smb->pdata->use_mains) {
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);
ret = power_supply_register(dev, &smb->mains);
if (ret < 0)
return ret;
}
if (smb->pdata->use_usb) {
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);
ret = power_supply_register(dev, &smb->usb);
if (ret < 0) {
if (smb->pdata->use_mains)
power_supply_unregister(&smb->mains);
return ret;
}
}
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->battery);
if (ret < 0) {
if (smb->pdata->use_usb)
power_supply_unregister(&smb->usb);
if (smb->pdata->use_mains)
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, 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 = __devexit_p(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");
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