From: Madhusudhan Chikkature <madhu.cr@xxxxxx>
ARM: OMAP: Triton Battery Charger Interface
This patch provides a OMAP Triton battery charger interface driver to moniter
the battery
through power class subsystem.
Signed-off-by: Madhusudhan Chikkature <madhu.cr@xxxxxx>
---
arch/arm/mach-omap2/devices.c | 17
drivers/power/Kconfig | 8
drivers/power/Makefile | 1
drivers/power/twl4030_bci_battery.c | 1144 ++++++++++++++++++++++++++++++++++++
4 files changed, 1170 insertions(+)
Index: linux-omap-2.6/arch/arm/mach-omap2/devices.c
===================================================================
--- linux-omap-2.6.orig/arch/arm/mach-omap2/devices.c 2008-06-20
15:39:56.000000000 +0530
+++ linux-omap-2.6/arch/arm/mach-omap2/devices.c 2008-06-20 15:42:05.000000000
+0530
@@ -358,6 +358,22 @@
static inline void omap_hdq_init(void) {}
#endif
+#ifdef CONFIG_TWL4030_BCI_BATTERY
+static struct platform_device omap_bci_battery_device = {
+ .name = "twl4030-bci-battery",
+ .id = 1,
+ .num_resources = 0,
+ .resource = NULL,
+};
+
+static inline void omap_bci_battery_init(void)
+{
+ (void) platform_device_register(&omap_bci_battery_device);
+}
+#else
+static inline void omap_bci_battery_init(void) {}
+#endif
+
/*-------------------------------------------------------------------------*/
static int __init omap2_init_devices(void)
@@ -369,6 +385,7 @@
omap_init_mbox();
omap_init_mcspi();
omap_hdq_init();
+ omap_bci_battery_init();
omap_init_sti();
omap_init_sha1_md5();
Index: linux-omap-2.6/drivers/power/Kconfig
===================================================================
--- linux-omap-2.6.orig/drivers/power/Kconfig 2008-06-20 15:39:56.000000000 +0530
+++ linux-omap-2.6/drivers/power/Kconfig 2008-06-20 15:42:05.000000000 +0530
@@ -70,4 +70,12 @@
help
Say Y here to enable support for batteries with BQ27200(I2C) chip.
+config TWL4030_BCI_BATTERY
+ bool "OMAP TWL4030 BCI Battery driver"
+ depends on (MACH_OMAP_2430SDP || MACH_OMAP_3430SDP) && TWL4030_CORE
+ default y
+ help
+ Support for OMAP TWL4030 BCI Battery driver.
+ This driver can give support for TWL4030 Battery Charge Interface.
+
endif # POWER_SUPPLY
Index: linux-omap-2.6/drivers/power/Makefile
===================================================================
--- linux-omap-2.6.orig/drivers/power/Makefile 2008-06-20 15:39:56.000000000 +0530
+++ linux-omap-2.6/drivers/power/Makefile 2008-06-20 15:42:05.000000000 +0530
@@ -21,3 +21,4 @@
obj-$(CONFIG_BATTERY_PMU) += pmu_battery.o
obj-$(CONFIG_BATTERY_OLPC) += olpc_battery.o
obj-$(CONFIG_BATTERY_BQ27x00) += bq27x00_battery.o
+obj-$(CONFIG_TWL4030_BCI_BATTERY) += twl4030_bci_battery.o
Index: linux-omap-2.6/drivers/power/twl4030_bci_battery.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-omap-2.6/drivers/power/twl4030_bci_battery.c 2008-06-20
15:42:05.000000000 +0530
@@ -0,0 +1,1144 @@
+/*
+ * linux/drivers/power/twl4030_bci_battery.c
+ *
+ * OMAP2430/3430 BCI battery driver for Linux
+ *
+ * Copyright (C) 2008 Texas Instruments, Inc.
+ * Author: Texas Instruments, Inc.
+ *
+ * This package 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 PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/i2c/twl4030.h>
+#include <linux/power_supply.h>
+
+#define T2_BATTERY_VOLT 0x04
+#define T2_BATTERY_TEMP 0x06
+#define T2_BATTERY_CUR 0x08
+
+/* charger constants */
+#define NO_PW_CONN 0
+#define AC_PW_CONN 0x01
+#define USB_PW_CONN 0x02
+
+/* TWL4030_MODULE_USB */
+#define REG_POWER_CTRL 0x0AC
+#define OTG_EN 0x020
+#define REG_PHY_CLK_CTRL 0x0FE
+#define REG_PHY_CLK_CTRL_STS 0x0FF
+#define PHY_DPLL_CLK 0x01
+
+#define REG_BCICTL1 0x023
+#define REG_BCICTL2 0x024
+#define CGAIN 0x020
+#define ITHEN 0x010
+#define ITHSENS 0x007
+
+/* Boot BCI flag bits */
+#define BCIAUTOWEN 0x020
+#define CONFIG_DONE 0x010
+#define BCIAUTOUSB 0x002
+#define BCIAUTOAC 0x001
+#define BCIMSTAT_MASK 0x03F
+
+/* Boot BCI register */
+#define REG_BOOT_BCI 0x007
+#define REG_CTRL1 0x00
+#define MADC_ON 0x01
+#define REG_SW1SELECT_MSB 0x07
+#define SW1_CH9_SEL 0x02
+#define REG_CTRL_SW1 0x012
+#define SW1_TRIGGER 0x020
+#define EOC_SW1 0x002
+#define REG_GPCH9 0x049
+#define REG_STS_HW_CONDITIONS 0x0F
+#define STS_VBUS 0x080
+#define STS_CHG 0x02
+#define REG_BCIMSTATEC 0x02
+#define REG_BCIMFSTS4 0x010
+#define REG_BCIMFSTS2 0x00E
+#define REG_BCIMFSTS3 0x00F
+#define REG_BCIMFSTS1 0x001
+#define USBFASTMCHG 0x004
+#define BATSTSPCHG 0x004
+#define BATSTSMCHG 0x040
+#define VBATOV4 0x020
+#define VBATOV3 0x010
+#define VBATOV2 0x008
+#define VBATOV1 0x004
+#define MADC_LSB_MASK 0xC0
+#define REG_BB_CFG 0x012
+#define BBCHEN 0x010
+
+/* Power supply charge interrupt */
+#define REG_PWR_ISR1 0x00
+#define REG_PWR_IMR1 0x01
+#define REG_PWR_EDR1 0x05
+#define REG_PWR_SIH_CTRL 0x007
+
+#define USB_PRES 0x004
+#define CHG_PRES 0x002
+
+#define USB_PRES_RISING 0x020
+#define USB_PRES_FALLING 0x010
+#define CHG_PRES_RISING 0x008
+#define CHG_PRES_FALLING 0x004
+#define AC_STATEC 0x20
+#define COR 0x004
+
+/* interrupt status registers */
+#define REG_BCIISR1A 0x0
+#define REG_BCIISR2A 0x01
+
+/* Interrupt flags bits BCIISR1 */
+#define BATSTS_ISR1 0x080
+#define VBATLVL_ISR1 0x001
+
+/* Interrupt mask registers for int1*/
+#define REG_BCIIMR1A 0x002
+#define REG_BCIIMR2A 0x003
+
+ /* Interrupt masks for BCIIMR1 */
+#define BATSTS_IMR1 0x080
+#define VBATLVL_IMR1 0x001
+
+/* Interrupt edge detection register */
+#define REG_BCIEDR1 0x00A
+#define REG_BCIEDR2 0x00B
+#define REG_BCIEDR3 0x00C
+
+/* BCIEDR2 */
+#define BATSTS_EDRRISIN 0x080
+#define BATSTS_EDRFALLING 0x040
+
+/* BCIEDR3 */
+#define VBATLVL_EDRRISIN 0x02
+
+/* Step size and prescaler ratio */
+#define TEMP_STEP_SIZE 147
+#define TEMP_PSR_R 100
+
+#define VOLT_STEP_SIZE 588
+#define VOLT_PSR_R 100
+
+#define CURR_STEP_SIZE 147
+#define CURR_PSR_R1 44
+#define CURR_PSR_R2 80
+
+#define BK_VOLT_STEP_SIZE 441
+#define BK_VOLT_PSR_R 100
+
+#define ENABLE 1
+#define DISABLE 1
+
+static int twl4030_bci_battery_probe(struct platform_device *dev);
+static int twl4030_bci_battery_remove(struct platform_device *dev);
+#ifdef CONFIG_PM
+static int twl4030_bci_battery_suspend(struct platform_device *dev,
+ pm_message_t state);
+static int twl4030_bci_battery_resume(struct platform_device *dev);
+#endif
+
+struct twl4030_bci_device_info {
+ struct device *dev;
+
+ unsigned long update_time;
+ int voltage_uV;
+ int bk_voltage_uV;
+ int current_uA;
+ int temp_C;
+ int charge_rsoc;
+ int charge_status;
+
+ struct power_supply bat;
+ struct power_supply bk_bat;
+ struct delayed_work twl4030_bci_monitor_work;
+ struct delayed_work twl4030_bk_bci_monitor_work;
+};
+
+static struct platform_driver twl4030_bci_battery_driver = {
+ .probe = twl4030_bci_battery_probe,
+ .remove = twl4030_bci_battery_remove,
+#ifdef CONFIG_PM
+ .suspend = twl4030_bci_battery_suspend,
+ .resume = twl4030_bci_battery_resume,
+#endif
+ .driver = {
+ .name = "twl4030-bci-battery",
+ },
+};
+
+static int usb_charger_flag;
+static int LVL_1, LVL_2, LVL_3, LVL_4;
+
+static int twl4030madc_sw1_trigger(void);
+static int read_bci_val(u8 reg_1);
+static inline int clear_n_set(u8 mod_no, u8 clear, u8 set, u8 reg);
+static int twl4030charger_presence(void);
+
+/*
+ * Twl4030 battery temperature lookup table.
+ */
+const int twl4030battery_temp_tbl [] =
+{
+/* 0 C*/
+27100,
+26000, 24900, 23900, 22900, 22000, 21100, 20300, 19400, 18700, 17900,
+17200, 16500, 15900, 15300, 14700, 14100, 13600, 13100, 12600, 12100,
+11600, 11200, 10800, 10400, 10000, 9630, 9280, 8950, 8620, 8310,
+8020, 7730, 7460, 7200, 6950, 6710, 6470, 6250, 6040, 5830,
+5640, 5450, 5260, 5090, 4920, 4760, 4600, 4450, 4310, 4170,
+4040, 3910, 3790, 3670, 3550
+};
+
+/*
+ * Report and clear the charger presence event.
+ */
+static inline int twl4030charger_presence_evt(void)
+{
+ int ret;
+ u8 chg_sts, set = 0, clear = 0;
+
+ /* read charger power supply status */
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &chg_sts,
+ REG_STS_HW_CONDITIONS);
+ if (ret)
+ return IRQ_NONE;
+
+ /* If the AC charger have been connected */
+ if (chg_sts & STS_CHG) {
+ /* configuring falling edge detection for CHG_PRES */
+ set = CHG_PRES_FALLING;
+ clear = CHG_PRES_RISING;
+ }
+ /* If the AC charger have been disconnected */
+ else {
+ /* configuring rising edge detection for CHG_PRES */
+ set = CHG_PRES_RISING;
+ clear = CHG_PRES_FALLING;
+ }
+
+ /* Update the interrupt edge detection register */
+ clear_n_set(TWL4030_MODULE_INT, clear, set, REG_PWR_EDR1);
+
+ return 0;
+}
+
+/*
+ * Interrupt service routine
+ *
+ * Attends to TWL 4030 power module interruptions events, specifically
+ * USB_PRES (USB charger presence) CHG_PRES (AC charger presence) events
+ *
+ */
+static irqreturn_t twl4030charger_interrupt(int irq, void *dev_id)
+{
+ struct twl4030_bci_device_info *di =
+ (struct twl4030_bci_device_info *)dev_id;
+
+ twl4030charger_presence_evt();
+ power_supply_changed(&di->bat);
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * This function handles the twl4030 battery presence interrupt
+ */
+static int twl4030battery_presence_evt(void)
+{
+ int ret;
+ u8 batstsmchg, batstspchg;
+
+ /* check for the battery presence in main charge*/
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE,
+ &batstsmchg, REG_BCIMFSTS3);
+ if (ret)
+ return ret;
+
+ /* check for the battery presence in precharge */
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_PRECHARGE,
+ &batstspchg, REG_BCIMFSTS1);
+ if (ret)
+ return ret;
+
+ /*
+ * REVISIT: Physically inserting/removing the batt
+ * does not seem to generate an int on 3430ES2 SDP.
+ */
+
+ /* In case of the battery insertion event */
+ if ((batstspchg & BATSTSPCHG) || (batstsmchg & BATSTSMCHG)) {
+ ret = clear_n_set(TWL4030_MODULE_INTERRUPTS, BATSTS_EDRRISIN,
+ BATSTS_EDRFALLING, REG_BCIEDR2);
+ if (ret)
+ return ret;
+ }
+
+ /* In case of the battery removal event */
+ else {
+ ret = clear_n_set(TWL4030_MODULE_INTERRUPTS, BATSTS_EDRFALLING,
+ BATSTS_EDRRISIN, REG_BCIEDR2);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * This function handles the twl4030 battery voltage level interrupt.
+ */
+static int twl4030battery_level_evt(void)
+{
+ int ret;
+ u8 mfst;
+
+ /* checking for threshold event */
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE,
+ &mfst, REG_BCIMFSTS2);
+ if (ret)
+ return ret;
+
+ if (mfst & VBATOV4) {
+ LVL_4 = 1;
+ LVL_3 = LVL_2 = LVL_1 = 0;
+ } else if (mfst & VBATOV3) {
+ LVL_3 = 1;
+ LVL_4 = LVL_2 = LVL_1 = 0;
+ } else if (mfst & VBATOV2) {
+ LVL_2 = 1;
+ LVL_4 = LVL_3 = LVL_1 = 0;
+ } else {
+ LVL_1 = 1;
+ LVL_4 = LVL_3 = LVL_2 = 0;
+ }
+
+ return 0;
+}
+
+/*
+ * Interrupt service routine
+ *
+ * Attends to BCI interruptions events,
+ * specifically BATSTS (battery connection and removal)
+ * VBATOV (main battery voltage threshold) events
+ *
+ */
+static irqreturn_t twl4030battery_interrupt(int irq, void *dev_id)
+{
+ int ret;
+ u8 isr1a_val, isr2a_val, clear_2a, clear_1a;
+
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &isr1a_val,
+ REG_BCIISR1A);
+ if (ret)
+ return IRQ_NONE;
+
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &isr2a_val,
+ REG_BCIISR2A);
+ if (ret)
+ return IRQ_NONE;
+
+ clear_2a = (isr2a_val & VBATLVL_ISR1)? (VBATLVL_ISR1): 0;
+ clear_1a = (isr1a_val & BATSTS_ISR1)? (BATSTS_ISR1): 0;
+
+ /* cleaning BCI interrupt status flags */
+ ret = twl4030_i2c_write_u8(TWL4030_MODULE_INTERRUPTS,
+ clear_1a , REG_BCIISR1A);
+ if (ret)
+ return IRQ_NONE;
+
+ ret = twl4030_i2c_write_u8(TWL4030_MODULE_INTERRUPTS,
+ clear_2a , REG_BCIISR2A);
+ if (ret)
+ return IRQ_NONE;
+
+ /* battery connetion or removal event */
+ if (isr1a_val & BATSTS_ISR1)
+ twl4030battery_presence_evt();
+ /* battery voltage threshold event*/
+ else if (isr2a_val & VBATLVL_ISR1)
+ twl4030battery_level_evt();
+ else
+ return IRQ_NONE;
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * Enable/Disable hardware battery level event notifications.
+ */
+static int twl4030battery_hw_level_en(int enable)
+{
+ int ret;
+
+ if (enable) {
+ /* unmask VBATOV interrupt for INT1 */
+ ret = clear_n_set(TWL4030_MODULE_INTERRUPTS, VBATLVL_IMR1,
+ 0, REG_BCIIMR2A);
+ if (ret)
+ return ret;
+
+ /* configuring interrupt edge detection for VBATOv */
+ ret = clear_n_set(TWL4030_MODULE_INTERRUPTS, 0,
+ VBATLVL_EDRRISIN, REG_BCIEDR3);
+ if (ret)
+ return ret;
+ } else {
+ /* mask VBATOV interrupt for INT1 */
+ ret = clear_n_set(TWL4030_MODULE_INTERRUPTS, 0,
+ VBATLVL_IMR1, REG_BCIIMR2A);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * Enable/disable hardware battery presence event notifications.
+ */
+static int twl4030battery_hw_presence_en(int enable)
+{
+ int ret;
+
+ if (enable) {
+ /* unmask BATSTS interrupt for INT1 */
+ ret = clear_n_set(TWL4030_MODULE_INTERRUPTS, BATSTS_IMR1,
+ 0, REG_BCIIMR1A);
+ if (ret)
+ return ret;
+
+ /* configuring interrupt edge for BATSTS */
+ ret = clear_n_set(TWL4030_MODULE_INTERRUPTS, 0,
+ BATSTS_EDRRISIN | BATSTS_EDRFALLING, REG_BCIEDR2);
+ if (ret)
+ return ret;
+ } else {
+ /* mask BATSTS interrupt for INT1 */
+ ret = clear_n_set(TWL4030_MODULE_INTERRUPTS, 0,
+ BATSTS_IMR1, REG_BCIIMR1A);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * Enable/Disable AC Charge funtionality.
+ */
+static int twl4030charger_ac_en(int enable)
+{
+ int ret;
+
+ if (enable) {
+ /* forcing the field BCIAUTOAC (BOOT_BCI[0) to 1 */
+ ret = clear_n_set(TWL4030_MODULE_PM_MASTER, 0,
+ (CONFIG_DONE | BCIAUTOWEN | BCIAUTOAC),
+ REG_BOOT_BCI);
+ if (ret)
+ return ret;
+ } else {
+ /* forcing the field BCIAUTOAC (BOOT_BCI[0) to 0*/
+ ret = clear_n_set(TWL4030_MODULE_PM_MASTER, BCIAUTOAC,
+ (CONFIG_DONE | BCIAUTOWEN),
+ REG_BOOT_BCI);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+/*
+ * Enable/Disable USB Charge funtionality.
+ */
+int twl4030charger_usb_en(int enable)
+{
+ u8 value;
+ int ret;
+ unsigned long timeout;
+
+ if (enable) {
+ /* Check for USB charger conneted */
+ ret = twl4030charger_presence();
+ if (ret < 0)
+ return ret;
+
+ if (!(ret & USB_PW_CONN))
+ return -ENXIO;
+
+ /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
+ ret = clear_n_set(TWL4030_MODULE_PM_MASTER, 0,
+ (CONFIG_DONE | BCIAUTOWEN | BCIAUTOUSB),
+ REG_BOOT_BCI);
+ if (ret)
+ return ret;
+
+ ret = clear_n_set(TWL4030_MODULE_USB, 0, PHY_DPLL_CLK,
+ REG_PHY_CLK_CTRL);
+ if (ret)
+ return ret;
+
+ value = 0;
+ timeout = jiffies + msecs_to_jiffies(50);
+
+ while ((!(value & PHY_DPLL_CLK)) &&
+ time_before(jiffies, timeout)) {
+ udelay(10);
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_USB, &value,
+ REG_PHY_CLK_CTRL_STS);
+ if (ret)
+ return ret;
+ }
+
+ /* OTG_EN (POWER_CTRL[5]) to 1 */
+ ret = clear_n_set(TWL4030_MODULE_USB, 0, OTG_EN,
+ REG_POWER_CTRL);
+ if (ret)
+ return ret;
+
+ mdelay(50);
+
+ /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
+ ret = clear_n_set(TWL4030_MODULE_MAIN_CHARGE, 0,
+ USBFASTMCHG, REG_BCIMFSTS4);
+ if (ret)
+ return ret;
+ } else {
+ twl4030charger_presence();
+ ret = clear_n_set(TWL4030_MODULE_PM_MASTER, BCIAUTOUSB,
+ (CONFIG_DONE | BCIAUTOWEN), REG_BOOT_BCI);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * Return battery temperature
+ * Or < 0 on failure.
+ */
+static int twl4030battery_temperature(void)
+{
+ u8 val;
+ int temp, curr, volt, res, ret;
+
+ /* Getting and calculating the thermistor voltage */
+ ret = read_bci_val(T2_BATTERY_TEMP);
+ if (ret < 0)
+ return ret;
+
+ volt = (ret * TEMP_STEP_SIZE) / TEMP_PSR_R;
+
+ /* Getting and calculating the supply current in micro ampers */
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, &val,
+ REG_BCICTL2);
+ if (ret)
+ return 0;
+
+ curr = ((val & ITHSENS) + 1) * 10;
+
+ /* Getting and calculating the thermistor resistance in ohms*/
+ res = volt * 1000 / curr;
+
+ /*calculating temperature*/
+ for (temp = 55; temp >= 0; temp--) {
+ int actual = twl4030battery_temp_tbl [temp];
+ if ((actual - res) >= 0)
+ break;
+ }
+
+ return temp + 1;
+}
+
+/*
+ * Return battery voltage
+ * Or < 0 on failure.
+ */
+static int twl4030battery_voltage(void)
+{
+ int volt = read_bci_val(T2_BATTERY_VOLT);
+
+ return (volt * VOLT_STEP_SIZE) / VOLT_PSR_R;
+}
+
+/*
+ * Return the battery current
+ * Or < 0 on failure.
+ */
+static int twl4030battery_current(void)
+{
+ int ret, curr = read_bci_val(T2_BATTERY_CUR);
+ u8 val;
+
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, &val,
+ REG_BCICTL1);
+ if (ret)
+ return ret;
+
+ if (val & CGAIN) /* slope of 0.44 mV/mA */
+ return (curr * CURR_STEP_SIZE) / CURR_PSR_R1;
+ else /* slope of 0.88 mV/mA */
+ return (curr * CURR_STEP_SIZE) / CURR_PSR_R2;
+}
+
+/*
+ * Return the battery backup voltage
+ * Or < 0 on failure.
+ */
+static int twl4030backupbatt_voltage(void)
+{
+ int ret, temp;
+ u8 volt;
+
+ /* trigger MADC convertion */
+ twl4030madc_sw1_trigger();
+
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_MADC, &volt,
+ REG_GPCH9 + 1);
+ if (ret)
+ return ret;
+
+ temp = ((int) volt) << 2;
+
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_MADC, &volt,
+ REG_GPCH9);
+ if (ret)
+ return ret;
+
+ temp = temp + ((int) ((volt & MADC_LSB_MASK) >> 6));
+
+ return (temp * BK_VOLT_STEP_SIZE) / BK_VOLT_PSR_R;
+}
+
+/*
+ * Returns an integer value, that means,
+ * NO_PW_CONN no power supply is connected
+ * AC_PW_CONN if the AC power supply is connected
+ * USB_PW_CONN if the USB power supply is connected
+ * AC_PW_CONN + USB_PW_CONN if USB and AC power supplies are both connected
+ *
+ * Or < 0 on failure.
+ */
+static int twl4030charger_presence(void)
+{
+ int ret;
+ u8 hwsts;
+
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
+ REG_STS_HW_CONDITIONS);
+ if (ret) {
+ pr_err("BATTERY DRIVER: error reading STS_HW_CONDITIONS \n");
+ return ret;
+ }
+
+ ret = (hwsts & STS_CHG)? AC_PW_CONN: NO_PW_CONN;
+ ret += (hwsts & STS_VBUS)? USB_PW_CONN: NO_PW_CONN;
+
+ if (ret & USB_PW_CONN)
+ usb_charger_flag = 1;
+ else
+ usb_charger_flag = 0;
+
+ return ret;
+
+}
+
+/*
+ * Returns the main charge FSM status
+ * Or < 0 on failure.
+ */
+static int twl4030bci_status(void)
+{
+ int ret;
+ u8 status;
+
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE,
+ &status, REG_BCIMSTATEC);
+ if (ret) {
+ pr_err("BATTERY DRIVER: error reading BCIMSTATEC \n");
+ return ret;
+ }
+
+ return (int) (status & BCIMSTAT_MASK);
+}
+
+static int read_bci_val(u8 reg)
+{
+ int ret, temp;
+ u8 val;
+
+ /* reading MSB */
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, &val,
+ reg + 1);
+ if (ret)
+ return ret;
+
+ temp = ((int)(val & 0x03)) << 8;
+
+ /* reading LSB */
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, &val,
+ reg);
+ if (ret)
+ return ret;
+
+ return temp | val;
+}
+
+/*
+ * Triggers the sw1 request for the twl4030 module to measure the sw1 selected
+ * channels
+ */
+static int twl4030madc_sw1_trigger(void)
+{
+ u8 val;
+ int ret;
+
+ /* Triggering SW1 MADC convertion */
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_MADC, &val,
+ REG_CTRL_SW1);
+ if (ret)
+ return ret;
+
+ val |= SW1_TRIGGER;
+
+ ret = twl4030_i2c_write_u8(TWL4030_MODULE_MADC, val,
+ REG_CTRL_SW1);
+ if (ret)
+ return ret;
+
+ /* Waiting until the SW1 conversion ends*/
+ val = 0;
+
+ while (!(val & EOC_SW1)) {
+ ret = twl4030_i2c_read_u8(TWL4030_MODULE_MADC, &val,
+ REG_CTRL_SW1);
+ if (ret)
+ return ret;
+ mdelay(10);
+ }
+
+ return 0;
+}
+
+/*
+ * Settup the twl4030 MADC module to measure the backup
+ * battery voltage.
+ */
+static int twl4030backupbatt_voltage_setup(void)
+{
+ int ret;
+
+ /* turning adc_on */
+ ret = twl4030_i2c_write_u8(TWL4030_MODULE_MADC, MADC_ON,
+ REG_CTRL1);
+ if (ret)
+ return ret;
+
+ /*setting MDC channel 9 to trigger by SW1*/
+ ret = clear_n_set(TWL4030_MODULE_MADC, 0, SW1_CH9_SEL,
+ REG_SW1SELECT_MSB);
+ if (ret)
+ return ret;
+
+ /* Starting backup batery charge */
+ ret = clear_n_set(TWL4030_MODULE_PM_RECEIVER, 0, BBCHEN,
+ REG_BB_CFG);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+/*
+ * Settup the twl4030 BCI and MADC module to measure battery
+ * temperature
+ */
+static int twl4030battery_temp_setup(void)
+{
+ int ret;
+
+ /* Enabling thermistor current */
+ ret = clear_n_set(TWL4030_MODULE_MAIN_CHARGE, 0, ITHEN,
+ REG_BCICTL1);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+/*
+ * Sets and clears bits on an given register on a given module
+ */
+static inline int clear_n_set(u8 mod_no, u8 clear, u8 set, u8 reg)
+{
+ int ret;
+ u8 val = 0;
+
+ /* Gets the initial register value */
+ ret = twl4030_i2c_read_u8(mod_no, &val, reg);
+ if (ret)
+ return ret;
+
+ /* Clearing all those bits to clear */
+ val &= ~(clear);
+
+ /* Setting all those bits to set */
+ val |= set;
+
+ /* Update the register */
+ ret = twl4030_i2c_write_u8(mod_no, val, reg);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static enum power_supply_property twl4030_bci_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_TEMP,
+};
+
+static enum power_supply_property twl4030_bk_bci_battery_props[] = {
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+};
+
+static void
+twl4030_bk_bci_battery_read_status(struct twl4030_bci_device_info *di)
+{
+ di->bk_voltage_uV = twl4030backupbatt_voltage();
+ return;
+}
+
+static void twl4030_bk_bci_battery_work(struct delayed_work *work)
+{
+ struct twl4030_bci_device_info *di = container_of(work,
+ struct twl4030_bci_device_info, twl4030_bk_bci_monitor_work);
+
+ twl4030_bk_bci_battery_read_status(di);
+ schedule_delayed_work(&di->twl4030_bk_bci_monitor_work, 500);
+ return;
+}
+
+static void twl4030_bci_battery_read_status(struct twl4030_bci_device_info *di)
+{
+ di->temp_C = twl4030battery_temperature();
+ di->voltage_uV = twl4030battery_voltage();
+ di->current_uA = twl4030battery_current();
+
+ return;
+}
+
+static void
+twl4030_bci_battery_update_status(struct twl4030_bci_device_info *di)
+{
+ twl4030_bci_battery_read_status(di);
+ di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
+
+ if (power_supply_am_i_supplied(&di->bat))
+ di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
+ else
+ di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
+
+ return;
+}
+
+static void twl4030_bci_battery_work(struct delayed_work *work)
+{
+ struct twl4030_bci_device_info *di = container_of(work,
+ struct twl4030_bci_device_info, twl4030_bci_monitor_work);
+
+ twl4030_bci_battery_update_status(di);
+ schedule_delayed_work(&di->twl4030_bci_monitor_work, 100);
+ return;
+}
+
+
+#define to_twl4030_bci_device_info(x) container_of((x), \
+ struct twl4030_bci_device_info, bat);
+
+static void twl4030_bci_battery_external_power_changed(struct power_supply *psy)
+{
+ struct twl4030_bci_device_info *di = to_twl4030_bci_device_info(psy);
+
+ cancel_delayed_work(&di->twl4030_bci_monitor_work);
+ schedule_delayed_work(&di->twl4030_bci_monitor_work, 0);
+}
+
+#define to_twl4030_bk_bci_device_info(x) container_of((x), \
+ struct twl4030_bci_device_info, bk_bat);
+
+static int twl4030_bk_bci_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct twl4030_bci_device_info *di = to_twl4030_bk_bci_device_info(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = di->bk_voltage_uV;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int twl4030_bci_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct twl4030_bci_device_info *di = to_twl4030_bci_device_info(psy);
+ int status = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = di->charge_status;
+ return 0;
+ default:
+ break;
+ }
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = di->voltage_uV;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ val->intval = di->current_uA;
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ val->intval = di->temp_C;
+ break;
+ case POWER_SUPPLY_PROP_ONLINE:
+ status = twl4030bci_status();
+ if ((status & AC_STATEC) == AC_STATEC)
+ val->intval = POWER_SUPPLY_TYPE_MAINS;
+ else if (usb_charger_flag)
+ val->intval = POWER_SUPPLY_TYPE_USB;
+ else
+ val->intval = 0;
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ /*
+ * need to get the correct percentage value per the
+ * battery characteristics. Approx values for now.
+ */
+ if (di->voltage_uV < 2894 || LVL_1) {
+ val->intval = 5;
+ LVL_1 = 0;
+ } else if ((di->voltage_uV < 3451 && di->voltage_uV > 2894)
+ || LVL_2) {
+ val->intval = 20;
+ LVL_2 = 0;
+ } else if ((di->voltage_uV < 3902 && di->voltage_uV > 3451)
+ || LVL_3) {
+ val->intval = 50;
+ LVL_3 = 0;
+ } else if ((di->voltage_uV < 3949 && di->voltage_uV > 3902)
+ || LVL_4) {
+ val->intval = 75;
+ LVL_4 = 0;
+ } else if (di->voltage_uV > 3949)
+ val->intval = 90;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static char *twl4030_bci_supplied_to[] = {
+ "twl4030_bci_battery",
+};
+
+static int twl4030_bci_battery_probe(struct platform_device *dev)
+{
+ struct twl4030_bci_device_info *di;
+ int ret;
+
+ di = kzalloc(sizeof(*di), GFP_KERNEL);
+ if (!di)
+ return -ENOMEM;
+
+ platform_set_drvdata(dev, di);
+
+ di->dev = &dev->dev;
+ di->bat.name = "twl4030_bci_battery";
+ di->bat.supplied_to = twl4030_bci_supplied_to;
+ di->bat.num_supplicants = ARRAY_SIZE(twl4030_bci_supplied_to);
+ di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
+ di->bat.properties = twl4030_bci_battery_props;
+ di->bat.num_properties = ARRAY_SIZE(twl4030_bci_battery_props);
+ di->bat.get_property = twl4030_bci_battery_get_property;
+ di->bat.external_power_changed =
+ twl4030_bci_battery_external_power_changed;
+
+ di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
+
+ di->bk_bat.name = "twl4030_bci_bk_battery";
+ di->bk_bat.type = POWER_SUPPLY_TYPE_BATTERY;
+ di->bk_bat.properties = twl4030_bk_bci_battery_props;
+ di->bk_bat.num_properties = ARRAY_SIZE(twl4030_bk_bci_battery_props);
+ di->bk_bat.get_property = twl4030_bk_bci_battery_get_property;
+ di->bk_bat.external_power_changed = NULL;
+
+ twl4030charger_ac_en(ENABLE);
+ twl4030charger_usb_en(ENABLE);
+ twl4030battery_hw_level_en(ENABLE);
+ twl4030battery_hw_presence_en(ENABLE);
+
+ /* settings for temperature sensing */
+ ret = twl4030battery_temp_setup();
+ if (ret)
+ goto temp_setup_fail;
+
+ /* enabling GPCH09 for read back battery voltage */
+ ret = twl4030backupbatt_voltage_setup();
+ if (ret)
+ goto voltage_setup_fail;
+
+ /* request BCI interruption */
+ ret = request_irq(TWL4030_MODIRQ_BCI, twl4030battery_interrupt,
+ IRQF_DISABLED, dev->name, NULL);
+ if (ret) {
+ pr_err("BATTERY DRIVER: (BCI) IRQ%d is not free.\n",
+ TWL4030_MODIRQ_PWR);
+ goto batt_irq_fail;
+ }
+
+ /* request Power interruption */
+ ret = request_irq(TWL4030_PWRIRQ_CHG_PRES, twl4030charger_interrupt,
+ 0, dev->name, di);
+
+ if (ret) {
+ pr_err("BATTERY DRIVER: (POWER) IRQ%d is not free.\n",
+ TWL4030_MODIRQ_PWR);
+ goto chg_irq_fail;
+ }
+
+ ret = power_supply_register(&dev->dev, &di->bat);
+ if (ret) {
+ pr_err("BATTERY DRIVER: failed to register main battery\n");
+ goto batt_failed;
+ }
+
+ INIT_DELAYED_WORK(&di->twl4030_bci_monitor_work,
+ twl4030_bci_battery_work);
+ schedule_delayed_work(&di->twl4030_bci_monitor_work, 0);
+
+ ret = power_supply_register(&dev->dev, &di->bk_bat);
+ if (ret) {
+ pr_err("BATTERY DRIVER: failed to register backup battery\n");
+ goto bk_batt_failed;
+ }
+
+ INIT_DELAYED_WORK(&di->twl4030_bk_bci_monitor_work,
+ twl4030_bk_bci_battery_work);
+ schedule_delayed_work(&di->twl4030_bk_bci_monitor_work, 500);
+
+ return 0;
+
+bk_batt_failed:
+ power_supply_unregister(&di->bat);
+batt_failed:
+ free_irq(TWL4030_MODIRQ_PWR, di);
+chg_irq_fail:
+prev_setup_err:
+ free_irq(TWL4030_MODIRQ_BCI, NULL);
+batt_irq_fail:
+voltage_setup_fail:
+temp_setup_fail:
+ twl4030charger_ac_en(DISABLE);
+ twl4030charger_usb_en(DISABLE);
+ twl4030battery_hw_level_en(DISABLE);
+ twl4030battery_hw_presence_en(DISABLE);
+ kfree(di);
+
+ return ret;
+}
+
+static int twl4030_bci_battery_remove(struct platform_device *dev)
+{
+ struct twl4030_bci_device_info *di = platform_get_drvdata(dev);
+
+ twl4030charger_ac_en(DISABLE);
+ twl4030charger_usb_en(DISABLE);
+ twl4030battery_hw_level_en(DISABLE);
+ twl4030battery_hw_presence_en(DISABLE);
+
+ free_irq(TWL4030_MODIRQ_BCI, NULL);
+ free_irq(TWL4030_MODIRQ_PWR, di);
+
+ flush_scheduled_work();
+ power_supply_unregister(&di->bat);
+ power_supply_unregister(&di->bk_bat);
+ platform_set_drvdata(dev, NULL);
+ kfree(di);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int twl4030_bci_battery_suspend(struct platform_device *dev,
+ pm_message_t state)
+{
+ struct twl4030_bci_device_info *di = platform_get_drvdata(dev);
+
+ di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
+ cancel_delayed_work(&di->twl4030_bci_monitor_work);
+ cancel_delayed_work(&di->twl4030_bk_bci_monitor_work);
+ return 0;
+}
+
+static int twl4030_bci_battery_resume(struct platform_device *dev)
+{
+ struct twl4030_bci_device_info *di = platform_get_drvdata(dev);
+
+ schedule_delayed_work(&di->twl4030_bci_monitor_work, 0);
+ schedule_delayed_work(&di->twl4030_bk_bci_monitor_work, 50);
+ return 0;
+}
+#endif /* CONFIG_PM */
+
+/*
+ * Battery driver module initializer function
+ * registers battery driver structure
+ */
+static int __init twl4030_battery_init(void)
+{
+ return platform_driver_register(&twl4030_bci_battery_driver);
+
+}
+
+/*
+ * Battery driver module exit function
+ * unregister battery driver structure
+ */
+static void __exit twl4030_battery_exit(void)
+{
+ platform_driver_unregister(&twl4030_bci_battery_driver);
+}
+
+module_init(twl4030_battery_init);
+module_exit(twl4030_battery_exit);
+MODULE_LICENSE("GPL");
--
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