TWL4030/TPS65950 is a multi-function device with integrated charger, which allows charging from AC or USB. This driver enables the charger and provides several monitoring functions.
Signed-off-by: Grazvydas Ignotas <[email protected]> --- For this driver to work, TWL4030-core needs to be patched to use correct macros so that it registers twl4030_bci platform_device. I'll send patches for this later. drivers/power/Kconfig | 7 + drivers/power/Makefile | 1 + drivers/power/twl4030_charger.c | 499 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 507 insertions(+), 0 deletions(-) create mode 100644 drivers/power/twl4030_charger.c diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index cea6cef..95d7e60 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -110,4 +110,11 @@ config CHARGER_PCF50633 help Say Y to include support for NXP PCF50633 Main Battery Charger. +config CHARGER_TWL4030 + tristate "OMAP TWL4030 BCI charger driver" + depends on TWL4030_CORE + default y + help + Say Y here to enable support for TWL4030 Battery Charge Interface. + endif # POWER_SUPPLY diff --git a/drivers/power/Makefile b/drivers/power/Makefile index b96f29d..9cea9b5 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -29,3 +29,4 @@ obj-$(CONFIG_BATTERY_BQ27x00) += bq27x00_battery.o obj-$(CONFIG_BATTERY_DA9030) += da9030_battery.o obj-$(CONFIG_BATTERY_MAX17040) += max17040_battery.o obj-$(CONFIG_CHARGER_PCF50633) += pcf50633-charger.o +obj-$(CONFIG_CHARGER_TWL4030) += twl4030_charger.o diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c new file mode 100644 index 0000000..604dd56 --- /dev/null +++ b/drivers/power/twl4030_charger.c @@ -0,0 +1,499 @@ +/* + * TWL4030/TPS65950 BCI (Battery Charger Interface) driver + * + * Copyright (C) 2009 Gražvydas Ignotas <[email protected]> + * + * based on twl4030_bci_battery.c by TI + * Copyright (C) 2008 Texas Instruments, Inc. + * + * 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; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/interrupt.h> +#include <linux/i2c/twl4030.h> +#include <linux/power_supply.h> + +#define REG_BCIMSTATEC 0x02 +#define REG_BCIICHG 0x08 +#define REG_BCIVAC 0x0a +#define REG_BCIVBUS 0x0c +#define REG_BCIMFSTS4 0x10 +#define REG_BCICTL1 0x23 + +#define REG_BOOT_BCI 0x07 +#define REG_STS_HW_CONDITIONS 0x0f + +#define BCIAUTOWEN 0x20 +#define CONFIG_DONE 0x10 +#define CVENAC 0x04 +#define BCIAUTOUSB 0x02 +#define BCIAUTOAC 0x01 +#define BCIMSTAT_MASK 0x3F +#define STS_VBUS 0x80 +#define STS_CHG 0x02 +#define STS_USB_ID 0x04 +#define CGAIN 0x20 +#define USBFASTMCHG 0x04 + +#define STATEC_USB 0x10 +#define STATEC_AC 0x20 +#define STATEC_STATUS_MASK 0x0f +#define STATEC_QUICK1 0x02 +#define STATEC_QUICK7 0x07 +#define STATEC_COMPLETE1 0x0b +#define STATEC_COMPLETE4 0x0e + +#define BCI_DELAY 100 + +struct twl4030_bci_device_info { + struct power_supply ac; + struct power_supply usb; + struct delayed_work bat_work; + bool started; +}; + +/* + * clear and set bits on an given register on a given module + */ +static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg) +{ + u8 val = 0; + int ret; + + ret = twl4030_i2c_read_u8(mod_no, &val, reg); + if (ret) + return ret; + + val &= ~clear; + val |= set; + + return twl4030_i2c_write_u8(mod_no, val, reg); +} + +static int twl4030bci_read_adc_val(u8 reg) +{ + int ret, temp; + u8 val; + + /* read MSB */ + ret = twl4030_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, &val, reg + 1); + if (ret) + return ret; + + temp = (int)(val & 0x03) << 8; + + /* read LSB */ + ret = twl4030_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, &val, reg); + if (ret) + return ret; + + return temp | val; +} + +static void twl4030bci_power_work(struct work_struct *work) +{ + struct twl4030_bci_device_info *di = container_of(work, + struct twl4030_bci_device_info, bat_work.work); + + power_supply_changed(&di->ac); + power_supply_changed(&di->usb); +} + +/* + * Attend to TWL4030 CHG_PRES (AC charger presence) events + */ +static irqreturn_t twl4030_charger_interrupt(int irq, void *_di) +{ + struct twl4030_bci_device_info *di = _di; + +#ifdef CONFIG_LOCKDEP + /* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which + * we don't want and can't tolerate. Although it might be + * friendlier not to borrow this thread context... + */ + local_irq_enable(); +#endif + + schedule_delayed_work(&di->bat_work, msecs_to_jiffies(BCI_DELAY)); + + return IRQ_HANDLED; +} + +/* + * Enable/Disable AC Charge funtionality. + */ +static int twl4030_charger_enable_ac(bool enable) +{ + int ret; + + if (enable) { + /* forcing the field BCIAUTOAC (BOOT_BCI[0) to 1 */ + ret = twl4030_clear_set(TWL4030_MODULE_PM_MASTER, 0, + CONFIG_DONE | BCIAUTOWEN | BCIAUTOAC, + REG_BOOT_BCI); + } else { + /* forcing the field BCIAUTOAC (BOOT_BCI[0) to 0*/ + ret = twl4030_clear_set(TWL4030_MODULE_PM_MASTER, BCIAUTOAC, + CONFIG_DONE | BCIAUTOWEN, + REG_BOOT_BCI); + } + + return ret; +} + +/* + * Check if VBUS power is present + */ +static int twl4030_charger_check_vbus(void) +{ + int ret; + u8 hwsts; + + ret = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts, + REG_STS_HW_CONDITIONS); + if (ret) { + pr_err("twl4030_bci: error reading STS_HW_CONDITIONS\n"); + return ret; + } + + pr_debug("check_vbus: HW_CONDITIONS %02x\n", hwsts); + + /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */ + if ((hwsts & STS_VBUS) && !(hwsts & STS_USB_ID)) + return 1; + + return 0; +} + +/* + * Enable/Disable USB Charge funtionality. + */ +static int twl4030_charger_enable_usb(bool enable) +{ + int ret; + + if (enable) { + /* Check for USB charger conneted */ + ret = twl4030_charger_check_vbus(); + if (ret < 0) + return ret; + + if (!ret) + return -ENXIO; + + /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */ + ret = twl4030_clear_set(TWL4030_MODULE_PM_MASTER, 0, + CONFIG_DONE | BCIAUTOWEN | BCIAUTOUSB, + REG_BOOT_BCI); + if (ret) + return ret; + + /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */ + ret = twl4030_clear_set(TWL4030_MODULE_MAIN_CHARGE, 0, + USBFASTMCHG, REG_BCIMFSTS4); + } else { + ret = twl4030_clear_set(TWL4030_MODULE_PM_MASTER, BCIAUTOUSB, + CONFIG_DONE | BCIAUTOWEN, REG_BOOT_BCI); + } + + return ret; +} + +/* + * Return voltage (valid while charging only) + * 10 bit ADC (0...0x3ff) scales to 0...6V + */ +static int twl4030_get_voltage(int reg) +{ + int ret = twl4030bci_read_adc_val(reg); + if (ret < 0) + return ret; + + return 6000 * ret / 1023; +} + +/* + * TI provided formulas: + * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 â 1) - 0.85 + * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 â 1) - 1.7 + * Here we use integer approximation of: + * CGAIN == 0: val * 1.6618 - 0.85 + * CGAIN == 1: (val * 1.6618 - 0.85) * 2 + */ +static int twl4030_charger_get_current(void) +{ + int curr; + int ret; + u8 bcictl1; + + curr = twl4030bci_read_adc_val(REG_BCIICHG); + if (curr < 0) + return curr; + + ret = twl4030_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, &bcictl1, + REG_BCICTL1); + if (ret) + return ret; + + ret = (curr * 16618 - 850 * 10000) / 10000; + if (bcictl1 & CGAIN) + ret *= 2; + + return ret; +} + +/* + * Returns the main charge FSM state + * Or < 0 on failure. + */ +static int twl4030bci_state(void) +{ + int ret; + u8 state; + + ret = twl4030_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, + &state, REG_BCIMSTATEC); + if (ret) { + pr_err("twl4030_bci: error reading BCIMSTATEC\n"); + return ret; + } + + pr_debug("state: %02x\n", state); + + return state & BCIMSTAT_MASK; +} + +static int twl4030_bci_state_to_status(int state) +{ + state &= STATEC_STATUS_MASK; + if (STATEC_QUICK1 <= state && state <= STATEC_QUICK7) + return POWER_SUPPLY_STATUS_CHARGING; + else if (STATEC_COMPLETE1 <= state && state <= STATEC_COMPLETE4) + return POWER_SUPPLY_STATUS_FULL; + else + return POWER_SUPPLY_STATUS_NOT_CHARGING; +} + +static int twl4030_charger_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + int is_charging; + int voltage_reg; + int state; + int ret; + + state = twl4030bci_state(); + if (state < 0) + return state; + + if (psy->type == POWER_SUPPLY_TYPE_USB) { + is_charging = state & STATEC_USB; + voltage_reg = REG_BCIVBUS; + } else { + is_charging = state & STATEC_AC; + voltage_reg = REG_BCIVAC; + } + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + if (is_charging) + val->intval = twl4030_bci_state_to_status(state); + else + val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; + break; + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + /* charging must be active for meaningful result */ + if (!is_charging) { + val->intval = 0; + break; + } + ret = twl4030_get_voltage(voltage_reg); + if (ret < 0) + return ret; + val->intval = ret; + break; + case POWER_SUPPLY_PROP_CURRENT_NOW: + if (!is_charging) { + val->intval = 0; + break; + } + /* current measurement is shared between AC and USB */ + ret = twl4030_charger_get_current(); + if (ret < 0) + return ret; + val->intval = ret; + break; + case POWER_SUPPLY_PROP_ONLINE: + val->intval = is_charging && + twl4030_bci_state_to_status(state) != + POWER_SUPPLY_STATUS_NOT_CHARGING; + break; + default: + return -EINVAL; + } + return 0; +} + +static enum power_supply_property twl4030_charger_props[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_ONLINE, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_CURRENT_NOW, +}; + +static struct twl4030_bci_device_info twl4030_bci = { + .ac = { + .name = "twl4030_ac", + .type = POWER_SUPPLY_TYPE_MAINS, + .properties = twl4030_charger_props, + .num_properties = ARRAY_SIZE(twl4030_charger_props), + .get_property = twl4030_charger_get_property, + }, + .usb = { + .name = "twl4030_usb", + .type = POWER_SUPPLY_TYPE_USB, + .properties = twl4030_charger_props, + .num_properties = ARRAY_SIZE(twl4030_charger_props), + .get_property = twl4030_charger_get_property, + }, +}; + +/* + * called by TWL4030 USB transceiver driver on USB_PRES interrupt. + */ +int twl4030charger_usb_en(int enable) +{ + if (twl4030_bci.started) + schedule_delayed_work(&twl4030_bci.bat_work, + msecs_to_jiffies(BCI_DELAY)); + + return twl4030_charger_enable_usb(enable); +} + +static int __devinit twl4030_bci_probe(struct platform_device *pdev) +{ + int irq; + int ret; + + twl4030_charger_enable_ac(true); + twl4030_charger_enable_usb(true); + + irq = platform_get_irq(pdev, 0); + + /* CHG_PRES irq */ + ret = request_irq(irq, twl4030_charger_interrupt, + 0, pdev->name, &twl4030_bci); + if (ret) { + dev_err(&pdev->dev, "could not request irq %d, status %d\n", + irq, ret); + goto fail_chg_irq; + } + + ret = power_supply_register(&pdev->dev, &twl4030_bci.ac); + if (ret) { + dev_err(&pdev->dev, "failed to register ac: %d\n", ret); + goto fail_register_ac; + } + + ret = power_supply_register(&pdev->dev, &twl4030_bci.usb); + if (ret) { + dev_err(&pdev->dev, "failed to register usb: %d\n", ret); + goto fail_register_usb; + } + + platform_set_drvdata(pdev, &twl4030_bci); + + INIT_DELAYED_WORK_DEFERRABLE(&twl4030_bci.bat_work, + twl4030bci_power_work); + schedule_delayed_work(&twl4030_bci.bat_work, + msecs_to_jiffies(BCI_DELAY)); + twl4030_bci.started = true; + + return 0; + +fail_register_usb: + power_supply_unregister(&twl4030_bci.ac); +fail_register_ac: + free_irq(irq, &twl4030_bci); +fail_chg_irq: + twl4030_charger_enable_ac(false); + twl4030_charger_enable_usb(false); + + return ret; +} + +static int __devexit twl4030_bci_remove(struct platform_device *pdev) +{ + struct twl4030_bci_device_info *di = platform_get_drvdata(pdev); + int irq = platform_get_irq(pdev, 0); + + di->started = false; + twl4030_charger_enable_ac(false); + twl4030_charger_enable_usb(false); + + free_irq(irq, di); + + flush_scheduled_work(); + power_supply_unregister(&di->ac); + power_supply_unregister(&di->usb); + platform_set_drvdata(pdev, NULL); + + return 0; +} + +#ifdef CONFIG_PM +static int twl4030_bci_suspend(struct platform_device *pdev, + pm_message_t state) +{ + /* flush all pending status updates */ + flush_scheduled_work(); + return 0; +} + +static int twl4030_bci_resume(struct platform_device *pdev) +{ + struct twl4030_bci_device_info *di = platform_get_drvdata(pdev); + + /* things may have changed while we were away */ + schedule_delayed_work(&di->bat_work, msecs_to_jiffies(BCI_DELAY)); + return 0; +} +#else +#define twl4030_bci_suspend NULL +#define twl4030_bci_resume NULL +#endif /* CONFIG_PM */ + +static struct platform_driver twl4030_bci_driver = { + .probe = twl4030_bci_probe, + .remove = __devexit_p(twl4030_bci_remove), + .suspend = twl4030_bci_suspend, + .resume = twl4030_bci_resume, + .driver = { + .name = "twl4030_bci", + .owner = THIS_MODULE, + }, +}; + +static int __init twl4030_bci_init(void) +{ + return platform_driver_register(&twl4030_bci_driver); +} +module_init(twl4030_bci_init); + +static void __exit twl4030_bci_exit(void) +{ + platform_driver_unregister(&twl4030_bci_driver); +} +module_exit(twl4030_bci_exit); + +MODULE_AUTHOR("Gražvydas Ignotas"); +MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:twl4030_bci"); -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
