[RFC PATCH] power: bq24261_charger: Add support for TI BQ24261 charger

From: Ramakrishna Pallala
Date: Tue Aug 18 2015 - 05:38:41 EST

Add new charger driver support for BQ24261 charger IC.

Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@xxxxxxxxx>
---
drivers/power/Kconfig | 6 +
drivers/power/Makefile | 1 +
drivers/power/bq24261_charger.c | 1127 +++++++++++++++++++++++++++++++++
include/linux/power/bq24261_charger.h | 26 +
4 files changed, 1160 insertions(+)
create mode 100644 drivers/power/bq24261_charger.c
create mode 100644 include/linux/power/bq24261_charger.h

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 08beeed..9bda940 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -395,6 +395,12 @@ config CHARGER_BQ24190
help
Say Y to enable support for the TI BQ24190 battery charger.

+config CHARGER_BQ24261
+ tristate "TI BQ24261 charger driver"
+ depends on I2C && EXTCON
+ help
+ Say Y here to enable support for TI BQ24261 battery charger.
+
config CHARGER_BQ24257
tristate "TI BQ24257 battery charger driver"
depends on I2C && GPIOLIB
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 5752ce8..bec8409 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -59,6 +59,7 @@ obj-$(CONFIG_CHARGER_MAX8997) += max8997_charger.o
obj-$(CONFIG_CHARGER_MAX8998) += max8998_charger.o
obj-$(CONFIG_CHARGER_BQ2415X) += bq2415x_charger.o
obj-$(CONFIG_CHARGER_BQ24190) += bq24190_charger.o
+obj-$(CONFIG_CHARGER_BQ24261) += bq24261_charger.o
obj-$(CONFIG_CHARGER_BQ24257) += bq24257_charger.o
obj-$(CONFIG_CHARGER_BQ24735) += bq24735-charger.o
obj-$(CONFIG_CHARGER_BQ25890) += bq25890_charger.o
diff --git a/drivers/power/bq24261_charger.c b/drivers/power/bq24261_charger.c
new file mode 100644
index 0000000..b96d7a3
--- /dev/null
+++ b/drivers/power/bq24261_charger.c
@@ -0,0 +1,1127 @@
+/*
+ * bq24261_charger.c - BQ24261 Charger driver
+ *
+ * Copyright (C) 2014 Intel Corporation
+ * Author: Jenny TC <jenny.tc@xxxxxxxxx>
+ * Ramakrishna Pallala <ramakrishna.pallala@xxxxxxxxx>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/power_supply.h>
+#include <linux/extcon.h>
+#include <linux/pm_runtime.h>
+#include <linux/io.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/power/bq24261_charger.h>
+
+#define DEV_NAME "bq24261_charger"
+
+#define EXCEPTION_MONITOR_DELAY (60 * HZ)
+#define WDT_RESET_DELAY (15 * HZ)
+
+/* BQ24261 registers */
+#define BQ24261_STAT_CTRL0_ADDR 0x00
+#define BQ24261_CTRL_ADDR 0x01
+#define BQ24261_BATT_VOL_CTRL_ADDR 0x02
+#define BQ24261_VENDOR_REV_ADDR 0x03
+#define BQ24261_TERM_FCC_ADDR 0x04
+#define BQ24261_VINDPM_STAT_ADDR 0x05
+#define BQ24261_ST_NTC_MON_ADDR 0x06
+
+#define BQ24261_RESET_MASK (0x01 << 7)
+#define BQ24261_RESET_ENABLE (0x01 << 7)
+
+#define BQ24261_FAULT_MASK 0x07
+#define BQ24261_STAT_MASK (0x03 << 4)
+#define BQ24261_BOOST_MASK (0x01 << 6)
+#define BQ24261_TMR_RST_MASK (0x01 << 7)
+#define BQ24261_TMR_RST (0x01 << 7)
+
+#define BQ24261_ENABLE_BOOST (0x01 << 6)
+
+#define BQ24261_VOVP 0x01
+#define BQ24261_LOW_SUPPLY 0x02
+#define BQ24261_THERMAL_SHUTDOWN 0x03
+#define BQ24261_BATT_TEMP_FAULT 0x04
+#define BQ24261_TIMER_FAULT 0x05
+#define BQ24261_BATT_OVP 0x06
+#define BQ24261_NO_BATTERY 0x07
+#define BQ24261_STAT_READY 0x00
+
+#define BQ24261_STAT_CHRG_PRGRSS (0x01 << 4)
+#define BQ24261_STAT_CHRG_DONE (0x02 << 4)
+#define BQ24261_STAT_FAULT (0x03 << 4)
+
+#define BQ24261_CE_MASK (0x01 << 1)
+#define BQ24261_CE_DISABLE (0x01 << 1)
+
+#define BQ24261_HiZ_MASK (0x01)
+#define BQ24261_HiZ_ENABLE (0x01)
+
+#define BQ24261_ICHRG_MASK (0x1F << 3)
+
+#define BQ24261_ITERM_MASK (0x03)
+#define BQ24261_MIN_ITERM 50 /* 50 mA */
+#define BQ24261_MAX_ITERM 300 /* 300 mA */
+
+#define BQ24261_VBREG_MASK (0x3F << 2)
+#define BQ24261_VBREG_MIN_CV 3500
+#define BQ24261_VBREG_MAX_CV 4440
+#define BQ24261_VBREG_CV_DIV 20
+#define BQ24261_VBREG_CV_BIT_POS 2
+
+#define BQ24261_INLMT_MASK (0x07 << 4)
+#define BQ24261_INLMT_100 0x00
+#define BQ24261_INLMT_150 (0x01 << 4)
+#define BQ24261_INLMT_500 (0x02 << 4)
+#define BQ24261_INLMT_900 (0x03 << 4)
+#define BQ24261_INLMT_1500 (0x04 << 4)
+#define BQ24261_INLMT_2000 (0x05 << 4)
+#define BQ24261_INLMT_2500 (0x06 << 4)
+
+#define BQ24261_TE_MASK (0x01 << 2)
+#define BQ24261_TE_ENABLE (0x01 << 2)
+#define BQ24261_STAT_ENABLE_MASK (0x01 << 3)
+#define BQ24261_STAT_ENABLE (0x01 << 3)
+
+#define BQ24261_VENDOR_MASK (0x07 << 5)
+#define BQ24261_PART_MASK (0x03 << 3)
+#define BQ24261_REV_MASK (0x07)
+#define VENDOR_BQ2426X (0x02 << 5)
+#define REV_BQ24261 (0x06)
+
+#define BQ24261_TS_MASK (0x01 << 3)
+#define BQ24261_TS_ENABLED (0x01 << 3)
+#define BQ24261_BOOST_ILIM_MASK (0x01 << 4)
+#define BQ24261_BOOST_ILIM_500ma (0x0)
+#define BQ24261_BOOST_ILIM_1A (0x01 << 4)
+#define BQ24261_VINDPM_OFF_MASK (0x01 << 0)
+#define BQ24261_VINDPM_OFF_5V (0x0)
+#define BQ24261_VINDPM_OFF_12V (0x01 << 0)
+
+#define BQ24261_SAFETY_TIMER_MASK (0x03 << 5)
+#define BQ24261_SAFETY_TIMER_40MIN 0x00
+#define BQ24261_SAFETY_TIMER_6HR (0x01 << 5)
+#define BQ24261_SAFETY_TIMER_9HR (0x02 << 5)
+#define BQ24261_SAFETY_TIMER_DISABLED (0x03 << 5)
+
+/* 1% above voltage max design to report over voltage */
+#define BQ24261_OVP_MULTIPLIER 1010
+#define BQ24261_OVP_RECOVER_MULTIPLIER 990
+#define BQ24261_DEF_BAT_VOLT_MAX_DESIGN 4200000
+
+/* Settings for Voltage / DPPM Register (05) */
+#define BQ24261_VBATT_LEVEL1 3700000
+#define BQ24261_VBATT_LEVEL2 3960000
+#define BQ24261_VINDPM_MASK (0x07)
+#define BQ24261_VINDPM_320MV (0x01 << 2)
+#define BQ24261_VINDPM_160MV (0x01 << 1)
+#define BQ24261_VINDPM_80MV (0x01 << 0)
+#define BQ24261_CD_STATUS_MASK (0x01 << 3)
+#define BQ24261_DPM_EN_MASK (0x01 << 4)
+#define BQ24261_DPM_EN_FORCE (0x01 << 4)
+#define BQ24261_LOW_CHG_MASK (0x01 << 5)
+#define BQ24261_LOW_CHG_EN (0x01 << 5)
+#define BQ24261_LOW_CHG_DIS (~BQ24261_LOW_CHG_EN)
+#define BQ24261_DPM_STAT_MASK (0x01 << 6)
+#define BQ24261_MINSYS_STAT_MASK (0x01 << 7)
+
+#define BQ24261_MIN_CC 500 /* 500mA */
+#define BQ24261_MAX_CC 3000 /* 3A */
+#define BQ24261_DEF_CC 1300 /* 1300mA */
+#define BQ24261_MAX_CV 4350 /*4350mV */
+#define BQ24261_DEF_CV 4350 /* 4350mV */
+#define BQ24261_DEF_ITERM 128 /* 128mA */
+#define BQ24261_MIN_TEMP 0 /* 0 degC */
+#define BQ24261_MAX_TEMP 60 /* 60 DegC */
+
+#define ILIM_100MA 100 /* 100mA */
+#define ILIM_500MA 500 /* 500mA */
+#define ILIM_900MA 900 /* 900mA */
+#define ILIM_1500MA 1500 /* 1500mA */
+#define ILIM_2000MA 2000 /* 2000mA */
+#define ILIM_2500MA 2500 /* 2500mA */
+#define ILIM_3000MA 3000 /* 3000mA */
+
+u16 bq24261_inlmt[][2] = {
+ {100, BQ24261_INLMT_100},
+ {150, BQ24261_INLMT_150},
+ {500, BQ24261_INLMT_500},
+ {900, BQ24261_INLMT_900},
+ {1500, BQ24261_INLMT_1500},
+ {2000, BQ24261_INLMT_2000},
+ {2500, BQ24261_INLMT_2500},
+};
+
+
+enum bq24261_status {
+ BQ24261_CHRGR_STAT_UNKNOWN,
+ BQ24261_CHRGR_STAT_READY,
+ BQ24261_CHRGR_STAT_CHARGING,
+ BQ24261_CHRGR_STAT_FULL,
+ BQ24261_CHRGR_STAT_FAULT,
+};
+
+enum bq2426x_model {
+ BQ2426X = 0,
+ BQ24260,
+ BQ24261,
+};
+
+struct bq24261_charger {
+ struct i2c_client *client;
+ struct bq24261_platform_data *pdata;
+ struct power_supply *psy_usb;
+ struct delayed_work fault_mon_work;
+ struct mutex lock;
+ enum bq2426x_model model;
+ struct delayed_work wdt_work;
+ struct work_struct irq_work;
+ struct list_head irq_queue;
+
+ /* extcon charger cables */
+ struct {
+ struct work_struct work;
+ struct notifier_block nb;
+ struct extcon_specific_cable_nb sdp;
+ struct extcon_specific_cable_nb cdp;
+ struct extcon_specific_cable_nb dcp;
+ struct extcon_specific_cable_nb otg;
+ enum power_supply_type chg_type;
+ bool boost;
+ bool connected;
+ } cable;
+
+ bool online;
+ bool present;
+ int chg_health;
+ enum bq24261_status chg_status;
+ int cc;
+ int cv;
+ int inlmt;
+ int max_cc;
+ int max_cv;
+ int iterm;
+ int max_temp;
+ int min_temp;
+ bool is_charging_enabled;
+};
+
+static inline int bq24261_read_reg(struct i2c_client *client, u8 reg)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(client, reg);
+ if (ret < 0)
+ dev_err(&client->dev,
+ "error(%d) in reading reg %d\n", ret, reg);
+ return ret;
+}
+
+static inline int bq24261_write_reg(struct i2c_client *client, u8 reg, u8 data)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, reg, data);
+ if (ret < 0)
+ dev_err(&client->dev,
+ "error(%d) in writing %d to reg %d\n", ret, data, reg);
+ return ret;
+}
+
+static inline int bq24261_update_reg(struct i2c_client *client, u8 reg,
+ u8 mask, u8 val)
+{
+ int ret;
+
+ ret = bq24261_read_reg(client, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = (ret & ~mask) | (mask & val);
+ return bq24261_write_reg(client, reg, ret);
+}
+
+static void lookup_regval(u16 tbl[][2], size_t size, u16 in_val, u8 *out_val)
+{
+ int i;
+
+ for (i = 1; i < size; ++i) {
+ if (in_val < tbl[i][0])
+ break;
+ }
+
+ *out_val = (u8) tbl[i - 1][1];
+}
+
+void bq24261_cc_to_reg(int cc, u8 *reg_val)
+{
+ /* Ichrg bits are B3-B7
+ * Icharge = 500mA + IchrgCode * 100mA
+ */
+ cc = clamp_t(int, cc, BQ24261_MIN_CC, BQ24261_MAX_CC);
+ cc = cc - BQ24261_MIN_CC;
+ *reg_val = (cc / 100) << 3;
+}
+
+void bq24261_cv_to_reg(int cv, u8 *reg_val)
+{
+ int val;
+
+ val = clamp_t(int, cv, BQ24261_VBREG_MIN_CV, BQ24261_VBREG_MAX_CV);
+ *reg_val = (((val - BQ24261_VBREG_MIN_CV) / BQ24261_VBREG_CV_DIV)
+ << BQ24261_VBREG_CV_BIT_POS);
+}
+
+void bq24261_inlmt_to_reg(int inlmt, u8 *regval)
+{
+ return lookup_regval(bq24261_inlmt, ARRAY_SIZE(bq24261_inlmt),
+ inlmt, regval);
+}
+
+static inline void bq24261_iterm_to_reg(int iterm, u8 *regval)
+{
+ /* Iterm bits are B0-B2
+ * Icharge = 50mA + ItermCode * 50mA
+ */
+ iterm = clamp_t(int, iterm, BQ24261_MIN_ITERM, BQ24261_MAX_ITERM);
+ iterm = iterm - BQ24261_MIN_ITERM;
+ *regval = iterm / 50;
+}
+
+static inline int bq24261_init_timers(struct bq24261_charger *chip)
+{
+ u8 reg_val;
+ int ret;
+
+ reg_val = BQ24261_SAFETY_TIMER_9HR;
+
+ if (chip->pdata->thermal_sensing)
+ reg_val |= BQ24261_TS_ENABLED;
+
+ ret = bq24261_update_reg(chip->client, BQ24261_ST_NTC_MON_ADDR,
+ BQ24261_TS_MASK | BQ24261_SAFETY_TIMER_MASK |
+ BQ24261_BOOST_ILIM_MASK, reg_val);
+
+ return ret;
+}
+
+static inline int bq24261_reset_wdt_timer(struct bq24261_charger *chip)
+{
+ u8 mask = BQ24261_TMR_RST_MASK, val = BQ24261_TMR_RST;
+
+ if (chip->cable.boost) {
+ mask |= BQ24261_BOOST_MASK;
+ val |= BQ24261_ENABLE_BOOST;
+ }
+
+ return bq24261_update_reg(chip->client, BQ24261_STAT_CTRL0_ADDR,
+ mask, val);
+}
+
+static inline int bq24261_set_cc(struct bq24261_charger *chip, int cc_mA)
+{
+ u8 reg_val;
+ int ret;
+
+ dev_dbg(&chip->client->dev, "%s=%d\n", __func__, cc_mA);
+
+ if (cc_mA && (cc_mA < BQ24261_MIN_CC)) {
+ dev_dbg(&chip->client->dev, "Set LOW_CHG bit\n");
+ reg_val = BQ24261_LOW_CHG_EN;
+ ret = bq24261_update_reg(chip->client,
+ BQ24261_VINDPM_STAT_ADDR,
+ BQ24261_LOW_CHG_MASK, reg_val);
+ return ret;
+ }
+
+ reg_val = BQ24261_LOW_CHG_DIS;
+ ret = bq24261_update_reg(chip->client, BQ24261_VINDPM_STAT_ADDR,
+ BQ24261_LOW_CHG_MASK, reg_val);
+
+ bq24261_cc_to_reg(cc_mA, &reg_val);
+
+ return bq24261_update_reg(chip->client, BQ24261_TERM_FCC_ADDR,
+ BQ24261_ICHRG_MASK, reg_val);
+}
+
+static inline int bq24261_set_cv(struct bq24261_charger *chip, int cv_mV)
+{
+ u8 reg_val;
+
+ dev_dbg(&chip->client->dev, "%s=%d\n", __func__, cv_mV);
+
+ bq24261_cv_to_reg(cv_mV, &reg_val);
+
+ return bq24261_update_reg(chip->client, BQ24261_BATT_VOL_CTRL_ADDR,
+ BQ24261_VBREG_MASK, reg_val);
+}
+
+static inline int bq24261_set_inlmt(struct bq24261_charger *chip, int inlmt)
+{
+ u8 reg_val;
+
+ dev_dbg(&chip->client->dev, "%s=%d\n", __func__, inlmt);
+
+ bq24261_inlmt_to_reg(inlmt, &reg_val);
+
+ /*
+ * Don't enable reset bit. Setting this
+ * bit will reset all the registers/
+ */
+ reg_val &= ~BQ24261_RESET_MASK;
+
+ return bq24261_update_reg(chip->client, BQ24261_CTRL_ADDR,
+ BQ24261_RESET_MASK|BQ24261_INLMT_MASK, reg_val);
+
+}
+
+static inline int bq24261_set_iterm(struct bq24261_charger *chip, int iterm)
+{
+ u8 reg_val;
+
+ bq24261_iterm_to_reg(iterm, &reg_val);
+
+ return bq24261_update_reg(chip->client, BQ24261_TERM_FCC_ADDR,
+ BQ24261_ITERM_MASK, reg_val);
+}
+
+static inline int bq24261_enable_charging(struct bq24261_charger *chip,
+ bool enable)
+{
+ int ret;
+ u8 reg_val;
+
+ if (enable) {
+ reg_val = (~BQ24261_CE_DISABLE & BQ24261_CE_MASK);
+ reg_val |= BQ24261_TE_ENABLE;
+ } else {
+ reg_val = BQ24261_CE_DISABLE;
+ }
+
+ reg_val |= BQ24261_STAT_ENABLE;
+
+ /*
+ * Don't enable reset bit. Setting this
+ * bit will reset all the registers/
+ */
+ reg_val &= ~BQ24261_RESET_MASK;
+
+ ret = bq24261_update_reg(chip->client, BQ24261_CTRL_ADDR,
+ BQ24261_STAT_ENABLE_MASK|BQ24261_RESET_MASK|
+ BQ24261_CE_MASK|BQ24261_TE_MASK,
+ reg_val);
+ if (ret || !enable)
+ return ret;
+
+ /* Set termination current */
+ ret = bq24261_set_iterm(chip, chip->iterm);
+ if (ret < 0)
+ dev_err(&chip->client->dev, "failed to set iTerm(%d)\n", ret);
+
+ /* Start WDT and Safety timers */
+ ret = bq24261_init_timers(chip);
+ if (ret)
+ dev_err(&chip->client->dev, "failed to set timers(%d)\n", ret);
+
+ return ret;
+}
+
+static inline int bq24261_enable_charger(struct bq24261_charger *chip,
+ int enable)
+{
+ u8 reg_val;
+ int ret;
+
+ reg_val = enable ? (~BQ24261_HiZ_ENABLE & BQ24261_HiZ_MASK) :
+ BQ24261_HiZ_ENABLE;
+
+ /*
+ * Don't enable reset bit. Setting this
+ * bit will reset all the registers/
+ */
+ reg_val &= ~BQ24261_RESET_MASK;
+
+ ret = bq24261_update_reg(chip->client, BQ24261_CTRL_ADDR,
+ BQ24261_HiZ_MASK|BQ24261_RESET_MASK, reg_val);
+ if (ret)
+ return ret;
+
+ return bq24261_reset_wdt_timer(chip);
+}
+
+static void bq24261_handle_health(struct bq24261_charger *chip, u8 stat_reg)
+{
+ struct i2c_client *client = chip->client;
+ bool fault_worker = false;
+
+ switch (stat_reg & BQ24261_FAULT_MASK) {
+ case BQ24261_VOVP:
+ chip->chg_health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+ fault_worker = true;
+ dev_err(&client->dev, "Charger Over Voltage Fault\n");
+ break;
+ case BQ24261_LOW_SUPPLY:
+ chip->chg_health = POWER_SUPPLY_HEALTH_DEAD;
+ fault_worker = true;
+ dev_err(&client->dev, "Charger Low Supply Fault\n");
+ break;
+ case BQ24261_THERMAL_SHUTDOWN:
+ chip->chg_health = POWER_SUPPLY_HEALTH_OVERHEAT;
+ dev_err(&client->dev, "Charger Thermal Fault\n");
+ break;
+ case BQ24261_BATT_TEMP_FAULT:
+ dev_err(&client->dev, "Battery Temperature Fault\n");
+ break;
+ case BQ24261_TIMER_FAULT:
+ chip->chg_health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+ dev_err(&client->dev, "Charger Timer Fault\n");
+ break;
+ case BQ24261_BATT_OVP:
+ chip->chg_health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+ dev_err(&client->dev, "Battery Over Voltage Fault\n");
+ break;
+ case BQ24261_NO_BATTERY:
+ dev_err(&client->dev, "No Battery Connected\n");
+ break;
+ default:
+ chip->chg_health = POWER_SUPPLY_HEALTH_GOOD;
+ }
+
+ if (fault_worker)
+ schedule_delayed_work(&chip->fault_mon_work,
+ EXCEPTION_MONITOR_DELAY);
+}
+
+static void bq24261_handle_status(struct bq24261_charger *chip, u8 stat_reg)
+{
+ struct i2c_client *client = chip->client;
+
+ switch (stat_reg & BQ24261_STAT_MASK) {
+ case BQ24261_STAT_READY:
+ chip->chg_status = BQ24261_CHRGR_STAT_READY;
+ dev_info(&client->dev, "Charger Status: Ready\n");
+ break;
+ case BQ24261_STAT_CHRG_PRGRSS:
+ chip->chg_status = BQ24261_CHRGR_STAT_CHARGING;
+ dev_info(&client->dev, "Charger Status: Charge Progress\n");
+ break;
+ case BQ24261_STAT_CHRG_DONE:
+ chip->chg_status = BQ24261_CHRGR_STAT_FULL;
+ dev_info(&client->dev, "Charger Status: Charge Done\n");
+ break;
+ case BQ24261_STAT_FAULT:
+ chip->chg_status = BQ24261_CHRGR_STAT_FAULT;
+ dev_warn(&client->dev, "Charger Status: Fault\n");
+ break;
+ default:
+ dev_info(&client->dev, "Invalid\n");
+ }
+}
+
+static int bq24261_get_charger_health(struct bq24261_charger *chip)
+{
+ if (!chip->present)
+ return POWER_SUPPLY_HEALTH_UNKNOWN;
+
+ return chip->chg_health;
+}
+
+static int bq24261_get_charging_status(struct bq24261_charger *chip)
+{
+ int status;
+
+ if (!chip->present)
+ return POWER_SUPPLY_STATUS_DISCHARGING;
+
+ switch (chip->chg_status) {
+ case BQ24261_CHRGR_STAT_READY:
+ status = POWER_SUPPLY_STATUS_DISCHARGING;
+ break;
+ case BQ24261_CHRGR_STAT_CHARGING:
+ status = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case BQ24261_CHRGR_STAT_FULL:
+ status = POWER_SUPPLY_STATUS_FULL;
+ break;
+ case BQ24261_CHRGR_STAT_FAULT:
+ status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ default:
+ status = POWER_SUPPLY_STATUS_DISCHARGING;
+ }
+
+ return status;
+}
+
+static int bq24261_usb_get_property(struct power_supply *psy,
+ enum power_supply_property psp, union power_supply_propval *val)
+{
+ struct bq24261_charger *chip = power_supply_get_drvdata(psy);
+
+ mutex_lock(&chip->lock);
+ switch (psp) {
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = chip->present;
+ break;
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = chip->online;
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ val->intval = bq24261_get_charger_health(chip);
+ break;
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = bq24261_get_charging_status(chip);
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+ val->intval = chip->pdata->max_cc * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+ val->intval = chip->pdata->max_cv * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ val->intval = chip->cc * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ val->intval = chip->cv * 1000;
+ break;
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ val->intval = chip->inlmt * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+ val->intval = chip->iterm * 1000;
+ break;
+ case POWER_SUPPLY_PROP_TEMP_MAX:
+ val->intval = chip->pdata->max_temp * 10;
+ break;
+ case POWER_SUPPLY_PROP_TEMP_MIN:
+ val->intval = chip->pdata->min_temp * 10;
+ break;
+ default:
+ mutex_unlock(&chip->lock);
+ return -EINVAL;
+ }
+ mutex_unlock(&chip->lock);
+
+ return 0;
+}
+
+static int bq24261_usb_set_property(struct power_supply *psy,
+ enum power_supply_property psp, const union power_supply_propval *val)
+{
+ struct bq24261_charger *chip = power_supply_get_drvdata(psy);
+ int ret = 0;
+
+ mutex_lock(&chip->lock);
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ ret = bq24261_set_cc(chip, (val->intval / 1000));
+ if (!ret)
+ chip->cc = val->intval;
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ ret = bq24261_set_cv(chip, (val->intval / 1000));
+ if (!ret)
+ chip->cv = val->intval;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ mutex_unlock(&chip->lock);
+
+ return ret;
+}
+
+static int bq24261_property_is_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ int ret;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ ret = 1;
+ break;
+ default:
+ ret = 0;
+ }
+
+ return ret;
+}
+
+static enum power_supply_property bq24261_usb_props[] = {
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_TYPE,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+ POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
+ POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
+ POWER_SUPPLY_PROP_TEMP_MAX,
+ POWER_SUPPLY_PROP_TEMP_MIN,
+};
+
+static char *bq24261_charger_supplied_to[] = {
+ "main-battery",
+};
+
+static struct power_supply_desc bq24261_charger_desc = {
+ .name = DEV_NAME,
+ .type = POWER_SUPPLY_TYPE_USB,
+ .properties = bq24261_usb_props,
+ .num_properties = ARRAY_SIZE(bq24261_usb_props),
+ .get_property = bq24261_usb_get_property,
+ .set_property = bq24261_usb_set_property,
+ .property_is_writeable = bq24261_property_is_writeable,
+};
+
+static void bq24261_wdt_reset_worker(struct work_struct *work)
+{
+
+ struct bq24261_charger *chip = container_of(work,
+ struct bq24261_charger, wdt_work.work);
+ int ret;
+
+ ret = bq24261_reset_wdt_timer(chip);
+ if (ret)
+ dev_err(&chip->client->dev, "WDT timer reset error(%d)\n", ret);
+
+ schedule_delayed_work(&chip->wdt_work, WDT_RESET_DELAY);
+}
+
+static void bq24261_irq_worker(struct work_struct *work)
+{
+ struct bq24261_charger *chip =
+ container_of(work, struct bq24261_charger, irq_work);
+ int ret;
+
+ /*
+ * Lock to ensure that interrupt register readings are done
+ * and processed sequentially. The interrupt Fault registers
+ * are read on clear and without sequential processing double
+ * fault interrupts or fault recovery cannot be handlled propely
+ */
+
+ mutex_lock(&chip->lock);
+
+ ret = bq24261_read_reg(chip->client, BQ24261_STAT_CTRL0_ADDR);
+ if (ret < 0) {
+ dev_err(&chip->client->dev,
+ "Error (%d) in reading BQ24261_STAT_CTRL0_ADDR\n", ret);
+ goto irq_out;
+ }
+
+ if (!chip->cable.boost) {
+ bq24261_handle_status(chip, ret);
+ bq24261_handle_health(chip, ret);
+ power_supply_changed(chip->psy_usb);
+ }
+
+irq_out:
+ mutex_unlock(&chip->lock);
+}
+
+static irqreturn_t bq24261_thread_handler(int id, void *data)
+{
+ struct bq24261_charger *chip = (struct bq24261_charger *)data;
+
+ queue_work(system_highpri_wq, &chip->irq_work);
+ return IRQ_HANDLED;
+}
+
+static void bq24261_fault_mon_work(struct work_struct *work)
+{
+ struct bq24261_charger *chip = container_of(work,
+ struct bq24261_charger, fault_mon_work.work);
+ int ret;
+
+ if ((chip->chg_health == POWER_SUPPLY_HEALTH_OVERVOLTAGE) ||
+ (chip->chg_health == POWER_SUPPLY_HEALTH_DEAD)) {
+
+ mutex_lock(&chip->lock);
+ ret = bq24261_read_reg(chip->client, BQ24261_STAT_CTRL0_ADDR);
+ if (ret < 0) {
+ dev_err(&chip->client->dev,
+ "Status register read failed(%d)\n", ret);
+ goto fault_mon_out;
+ }
+
+ if ((ret & BQ24261_STAT_MASK) == BQ24261_STAT_READY) {
+ dev_info(&chip->client->dev,
+ "Charger fault recovered\n");
+ bq24261_handle_status(chip, ret);
+ bq24261_handle_health(chip, ret);
+ power_supply_changed(chip->psy_usb);
+ }
+fault_mon_out:
+ mutex_unlock(&chip->lock);
+ }
+}
+
+static void bq24261_boost_control(struct bq24261_charger *chip, bool enable)
+{
+ int ret;
+
+ if (enable)
+ ret = bq24261_write_reg(chip->client, BQ24261_STAT_CTRL0_ADDR,
+ BQ24261_TMR_RST | BQ24261_ENABLE_BOOST);
+ else
+ ret = bq24261_write_reg(chip->client,
+ BQ24261_STAT_CTRL0_ADDR, 0x0);
+
+ if (ret < 0)
+ dev_err(&chip->client->dev,
+ "stat cntl0 reg access error(%d)\n", ret);
+}
+
+static void bq24261_extcon_event_work(struct work_struct *work)
+{
+ struct bq24261_charger *chip =
+ container_of(work, struct bq24261_charger, cable.work);
+ int ret, current_limit = 0;
+ bool old_connected = chip->cable.connected;
+
+ /* Determine cable/charger type */
+ if (extcon_get_cable_state(chip->cable.sdp.edev,
+ "SLOW-CHARGER") > 0) {
+ chip->cable.connected = true;
+ current_limit = ILIM_500MA;
+ chip->cable.chg_type = POWER_SUPPLY_TYPE_USB;
+ dev_dbg(&chip->client->dev, "USB SDP charger is connected");
+ } else if (extcon_get_cable_state(chip->cable.cdp.edev,
+ "CHARGE-DOWNSTREAM") > 0) {
+ chip->cable.connected = true;
+ current_limit = ILIM_1500MA;
+ chip->cable.chg_type = POWER_SUPPLY_TYPE_USB_CDP;
+ dev_dbg(&chip->client->dev, "USB CDP charger is connected");
+ } else if (extcon_get_cable_state(chip->cable.dcp.edev,
+ "FAST-CHARGER") > 0) {
+ chip->cable.connected = true;
+ current_limit = ILIM_1500MA;
+ chip->cable.chg_type = POWER_SUPPLY_TYPE_USB_DCP;
+ dev_dbg(&chip->client->dev, "USB DCP charger is connected");
+ } else if (extcon_get_cable_state(chip->cable.otg.edev,
+ "USB-Host") > 0) {
+ chip->cable.boost = true;
+ chip->cable.connected = true;
+ dev_dbg(&chip->client->dev, "USB-Host cable is connected");
+ } else {
+ if (old_connected)
+ dev_dbg(&chip->client->dev, "USB Cable disconnected");
+ chip->cable.connected = false;
+ chip->cable.boost = false;
+ chip->cable.chg_type = POWER_SUPPLY_TYPE_USB;
+ }
+
+ /* Cable status changed */
+ if (old_connected == chip->cable.connected)
+ return;
+
+ mutex_lock(&chip->lock);
+ if (chip->cable.connected && !chip->cable.boost) {
+ chip->inlmt = current_limit;
+ /* Set up charging */
+ ret = bq24261_set_cc(chip, chip->cc);
+ if (ret < 0)
+ dev_err(&chip->client->dev, "set CC failed(%d)", ret);
+ ret = bq24261_set_cv(chip, chip->cv);
+ if (ret < 0)
+ dev_err(&chip->client->dev, "set CV failed(%d)", ret);
+ ret = bq24261_set_inlmt(chip, chip->inlmt);
+ if (ret < 0)
+ dev_err(&chip->client->dev, "set ILIM failed(%d)", ret);
+ ret = bq24261_enable_charger(chip, true);
+ if (ret < 0)
+ dev_err(&chip->client->dev,
+ "enable charger failed(%d)", ret);
+ ret = bq24261_enable_charging(chip, true);
+ if (ret < 0)
+ dev_err(&chip->client->dev,
+ "enable charging failed(%d)", ret);
+
+ chip->is_charging_enabled = true;
+ chip->present = true;
+ chip->online = true;
+ schedule_delayed_work(&chip->wdt_work, 0);
+ } else if (chip->cable.connected && chip->cable.boost) {
+ /* Enable VBUS for Host Mode */
+ bq24261_boost_control(chip, true);
+ schedule_delayed_work(&chip->wdt_work, 0);
+ } else {
+ dev_info(&chip->client->dev, "Cable disconnect event\n");
+ cancel_delayed_work_sync(&chip->wdt_work);
+ cancel_delayed_work_sync(&chip->fault_mon_work);
+ bq24261_boost_control(chip, false);
+ ret = bq24261_enable_charging(chip, false);
+ if (ret < 0)
+ dev_err(&chip->client->dev,
+ "charger disable failed(%d)", ret);
+
+ chip->is_charging_enabled = false;
+ chip->present = false;
+ chip->online = false;
+ chip->inlmt = 0;
+ }
+ bq24261_charger_desc.type = chip->cable.chg_type;
+ mutex_unlock(&chip->lock);
+ power_supply_changed(chip->psy_usb);
+}
+
+static int bq24261_handle_extcon_events(struct notifier_block *nb,
+ unsigned long event, void *param)
+{
+ struct bq24261_charger *chip =
+ container_of(nb, struct bq24261_charger, cable.nb);
+
+ dev_dbg(&chip->client->dev, "external connector event(%ld)\n", event);
+
+ schedule_work(&chip->cable.work);
+ return NOTIFY_OK;
+}
+
+static int bq24261_extcon_register(struct bq24261_charger *chip)
+{
+ int ret;
+
+ INIT_WORK(&chip->cable.work, bq24261_extcon_event_work);
+ chip->cable.nb.notifier_call = bq24261_handle_extcon_events;
+
+ ret = extcon_register_interest(&chip->cable.sdp, NULL,
+ "SLOW-CHARGER", &chip->cable.nb);
+ if (ret < 0) {
+ dev_warn(&chip->client->dev,
+ "extcon SDP registration failed(%d)\n", ret);
+ goto sdp_reg_failed;
+ }
+
+ ret = extcon_register_interest(&chip->cable.cdp, NULL,
+ "CHARGE-DOWNSTREAM", &chip->cable.nb);
+ if (ret < 0) {
+ dev_warn(&chip->client->dev,
+ "extcon CDP registration failed(%d)\n", ret);
+ goto cdp_reg_failed;
+ }
+
+ ret = extcon_register_interest(&chip->cable.dcp, NULL,
+ "FAST-CHARGER", &chip->cable.nb);
+ if (ret < 0) {
+ dev_warn(&chip->client->dev,
+ "extcon DCP registration failed(%d)\n", ret);
+ goto dcp_reg_failed;
+ }
+
+ ret = extcon_register_interest(&chip->cable.otg, NULL,
+ "USB-Host", &chip->cable.nb);
+ if (ret < 0) {
+ dev_warn(&chip->client->dev,
+ "extcon USB-Host registration failed(%d)\n", ret);
+ goto otg_reg_failed;
+ }
+
+ return 0;
+
+otg_reg_failed:
+ extcon_unregister_interest(&chip->cable.dcp);
+dcp_reg_failed:
+ extcon_unregister_interest(&chip->cable.cdp);
+cdp_reg_failed:
+ extcon_unregister_interest(&chip->cable.sdp);
+sdp_reg_failed:
+ return -EPROBE_DEFER;
+}
+
+static int bq24261_get_model(struct i2c_client *client,
+ enum bq2426x_model *model)
+{
+ int ret;
+
+ ret = bq24261_read_reg(client, BQ24261_VENDOR_REV_ADDR);
+ if (ret < 0)
+ return ret;
+
+ if ((ret & BQ24261_VENDOR_MASK) != VENDOR_BQ2426X)
+ return -EINVAL;
+
+ switch (ret & BQ24261_REV_MASK) {
+ case REV_BQ24261:
+ *model = BQ24261;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int bq24261_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+ struct power_supply_config charger_cfg = {};
+ struct bq24261_charger *chip;
+ int ret;
+ enum bq2426x_model model;
+
+ adapter = to_i2c_adapter(client->dev.parent);
+
+ if (!client->dev.platform_data && !id) {
+ dev_err(&client->dev, "platform data is null");
+ return -EFAULT;
+ }
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
+ dev_err(&client->dev,
+ "I2C adapter %s doesn'tsupport BYTE DATA transfer\n",
+ adapter->name);
+ return -EIO;
+ }
+
+ ret = bq24261_get_model(client, &model);
+ if (ret < 0) {
+ dev_err(&client->dev, "chip detection error (%d)\n", ret);
+ return -ENODEV;
+ }
+
+ chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->client = client;
+ if (client->dev.platform_data)
+ chip->pdata = client->dev.platform_data;
+ else
+ chip->pdata = (struct bq24261_platform_data *)id->driver_data;
+ i2c_set_clientdata(client, chip);
+ mutex_init(&chip->lock);
+ chip->model = model;
+
+ /* Initialize charger parameters */
+ chip->cc = chip->pdata->def_cc;
+ chip->cv = chip->pdata->def_cv;
+ chip->iterm = chip->pdata->iterm;
+ chip->chg_status = BQ24261_CHRGR_STAT_UNKNOWN;
+ chip->chg_health = POWER_SUPPLY_HEALTH_UNKNOWN;
+
+ charger_cfg.drv_data = chip;
+ charger_cfg.supplied_to = bq24261_charger_supplied_to;
+ charger_cfg.num_supplicants = ARRAY_SIZE(bq24261_charger_supplied_to);
+ chip->psy_usb = power_supply_register(&client->dev,
+ &bq24261_charger_desc, &charger_cfg);
+ if (IS_ERR(chip->psy_usb)) {
+ dev_err(&client->dev,
+ "power supply registration failed(%d)\n", ret);
+ return ret;
+ }
+
+ INIT_DELAYED_WORK(&chip->wdt_work, bq24261_wdt_reset_worker);
+ INIT_DELAYED_WORK(&chip->fault_mon_work, bq24261_fault_mon_work);
+
+ ret = bq24261_extcon_register(chip);
+ if (ret < 0)
+ goto extcon_reg_failed;
+
+ if (chip->client->irq) {
+ ret = request_threaded_irq(chip->client->irq,
+ NULL, bq24261_thread_handler,
+ IRQF_SHARED | IRQF_NO_SUSPEND,
+ DEV_NAME, chip);
+ if (ret) {
+ dev_err(&client->dev,
+ "irq request failed (%d)\n", ret);
+ goto irq_reg_failed;
+ }
+ INIT_WORK(&chip->irq_work, bq24261_irq_worker);
+ }
+
+ /* Check for charger connecetd boot case */
+ schedule_work(&chip->cable.work);
+
+ return 0;
+
+irq_reg_failed:
+ extcon_unregister_interest(&chip->cable.sdp);
+ extcon_unregister_interest(&chip->cable.cdp);
+ extcon_unregister_interest(&chip->cable.dcp);
+ extcon_unregister_interest(&chip->cable.otg);
+extcon_reg_failed:
+ power_supply_unregister(chip->psy_usb);
+ return ret;
+}
+
+static int bq24261_remove(struct i2c_client *client)
+{
+ struct bq24261_charger *chip = i2c_get_clientdata(client);
+
+ free_irq(client->irq, chip);
+ flush_scheduled_work();
+ extcon_unregister_interest(&chip->cable.sdp);
+ extcon_unregister_interest(&chip->cable.cdp);
+ extcon_unregister_interest(&chip->cable.dcp);
+ extcon_unregister_interest(&chip->cable.otg);
+ power_supply_unregister(chip->psy_usb);
+ return 0;
+}
+
+static int bq24261_suspend(struct device *dev)
+{
+ struct bq24261_charger *chip = dev_get_drvdata(dev);
+
+ dev_dbg(&chip->client->dev, "bq24261 suspend\n");
+ return 0;
+}
+
+static int bq24261_resume(struct device *dev)
+{
+ struct bq24261_charger *chip = dev_get_drvdata(dev);
+
+ dev_dbg(&chip->client->dev, "bq24261 resume\n");
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(bq24261_pm_ops, bq24261_suspend,
+ bq24261_resume);
+
+static const struct i2c_device_id bq24261_id[] = {
+ {DEV_NAME, 0},
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, bq24261_id);
+
+static struct i2c_driver bq24261_driver = {
+ .driver = {
+ .name = DEV_NAME,
+ .pm = &bq24261_pm_ops,
+ },
+ .probe = bq24261_probe,
+ .remove = bq24261_remove,
+ .id_table = bq24261_id,
+};
+
+module_i2c_driver(bq24261_driver);
+
+MODULE_AUTHOR("Jenny TC <jenny.tc@xxxxxxxxx>");
+MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@xxxxxxxxx>");
+MODULE_DESCRIPTION("BQ24261 Charger Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/power/bq24261_charger.h b/include/linux/power/bq24261_charger.h
new file mode 100644
index 0000000..656db58
--- /dev/null
+++ b/include/linux/power/bq24261_charger.h
@@ -0,0 +1,26 @@
+/*
+ * bq24261_charger.h: platform data structure for bq24261 driver
+ *
+ * Copyright (C) 2014 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ */
+
+#ifndef __BQ24261_CHARGER_H__
+#define __BQ24261_CHARGER_H__
+
+struct bq24261_platform_data {
+ int def_cc;
+ int def_cv;
+ int iterm;
+ int max_cc;
+ int max_cv;
+ int min_temp;
+ int max_temp;
+ bool thermal_sensing;
+};
+
+#endif
--
1.7.9.5

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