Hi,
Some comments inlined below.
>-----Original Message-----
>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>
>---
> drivers/power/Kconfig | 8
> drivers/power/Makefile | 1
> drivers/power/twl4030_bci_battery.c | 1139
>++++++++++++++++++++++++++++++++++++
> 3 files changed, 1148 insertions(+)
>
>Index: linux-omap-2.6/drivers/power/Kconfig
>===================================================================
>--- linux-omap-2.6.orig/drivers/power/Kconfig 2008-06-16
>16:46:52.000000000 +0530
>+++ linux-omap-2.6/drivers/power/Kconfig 2008-06-27
>16:01:08.000000000 +0530
>@@ -70,4 +70,12 @@ config BATTERY_BQ27200
> help
> Say Y here to enable support for batteries with
>BQ27200(I2C) chip.
>
>+config TWL4030_BCI_BATTERY
>+ tristate "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 2008-06-16
>16:46:52.000000000 +0530
>+++ linux-omap-2.6/drivers/power/Makefile 2008-06-27
>15:53:29.000000000 +0530
>@@ -21,3 +21,4 @@ obj-$(CONFIG_BATTERY_DS2760) += ds2760_b
> obj-$(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 2008-07-03
>16:10:11.000000000 +0530
>@@ -0,0 +1,1139 @@
>+/*
>+ * 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
>+};
Please mention the thermistor name/code (and possibly a reference to the
spec)
which gives these temperature characteristics. How about boards with
other
thermistors than this? Negative temperatures?
>+
>+/*
>+ * 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 = 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)
>+{
perhaps use twl4030-madc driver?
>+ 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)
>+{
check twl4030-madc.
>+ 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)
>+{
>
check twl4030-madc.
+ 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)
>+{
check twl4030-madc.
>+ 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)
>+{
check twl4030-madc.
>+ 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();
>+}
>+
>+static void twl4030_bk_bci_battery_work(struct work_struct *work)
>+{
>+ struct twl4030_bci_device_info *di = container_of(work,
>+ struct twl4030_bci_device_info,
>+ twl4030_bk_bci_monitor_work.work);
>+
>+ twl4030_bk_bci_battery_read_status(di);
>+ schedule_delayed_work(&di->twl4030_bk_bci_monitor_work, 500);
>+}
>+
>+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();
>+}
>+
>+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;
>+}
>+
>+static void twl4030_bci_battery_work(struct work_struct *work)
>+{
>+ struct twl4030_bci_device_info *di = container_of(work,
>+ struct twl4030_bci_device_info,
>twl4030_bci_monitor_work.work);
>+
>+ twl4030_bci_battery_update_status(di);
>+ schedule_delayed_work(&di->twl4030_bci_monitor_work, 100);
>+}
>+
>+
>+#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_DEFERRABLE(&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_DEFERRABLE(&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");
>+MODULE_ALIAS("twl4030_bci_battery");
>+MODULE_AUTHOR("Texas Instruments Inc");
>
>
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