diff options
Diffstat (limited to 'drivers/power/twl4030_charger.c')
| -rw-r--r-- | drivers/power/twl4030_charger.c | 642 |
1 files changed, 0 insertions, 642 deletions
diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c deleted file mode 100644 index be98e70380f9..000000000000 --- a/drivers/power/twl4030_charger.c +++ /dev/null @@ -1,642 +0,0 @@ -/* - * TWL4030/TPS65950 BCI (Battery Charger Interface) driver - * - * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com> - * - * 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/slab.h> -#include <linux/err.h> -#include <linux/platform_device.h> -#include <linux/interrupt.h> -#include <linux/i2c/twl.h> -#include <linux/power_supply.h> -#include <linux/notifier.h> -#include <linux/usb/otg.h> -#include <linux/regulator/machine.h> - -#define TWL4030_BCIMSTATEC 0x02 -#define TWL4030_BCIICHG 0x08 -#define TWL4030_BCIVAC 0x0a -#define TWL4030_BCIVBUS 0x0c -#define TWL4030_BCIMFSTS4 0x10 -#define TWL4030_BCICTL1 0x23 -#define TWL4030_BB_CFG 0x12 - -#define TWL4030_BCIAUTOWEN BIT(5) -#define TWL4030_CONFIG_DONE BIT(4) -#define TWL4030_BCIAUTOUSB BIT(1) -#define TWL4030_BCIAUTOAC BIT(0) -#define TWL4030_CGAIN BIT(5) -#define TWL4030_USBFASTMCHG BIT(2) -#define TWL4030_STS_VBUS BIT(7) -#define TWL4030_STS_USB_ID BIT(2) -#define TWL4030_BBCHEN BIT(4) -#define TWL4030_BBSEL_MASK 0x0c -#define TWL4030_BBSEL_2V5 0x00 -#define TWL4030_BBSEL_3V0 0x04 -#define TWL4030_BBSEL_3V1 0x08 -#define TWL4030_BBSEL_3V2 0x0c -#define TWL4030_BBISEL_MASK 0x03 -#define TWL4030_BBISEL_25uA 0x00 -#define TWL4030_BBISEL_150uA 0x01 -#define TWL4030_BBISEL_500uA 0x02 -#define TWL4030_BBISEL_1000uA 0x03 - -/* BCI interrupts */ -#define TWL4030_WOVF BIT(0) /* Watchdog overflow */ -#define TWL4030_TMOVF BIT(1) /* Timer overflow */ -#define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */ -#define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */ -#define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */ -#define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */ -#define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */ -#define TWL4030_BATSTS BIT(7) /* Battery status */ - -#define TWL4030_VBATLVL BIT(0) /* VBAT level */ -#define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */ -#define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */ -#define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */ - -#define TWL4030_MSTATEC_USB BIT(4) -#define TWL4030_MSTATEC_AC BIT(5) -#define TWL4030_MSTATEC_MASK 0x0f -#define TWL4030_MSTATEC_QUICK1 0x02 -#define TWL4030_MSTATEC_QUICK7 0x07 -#define TWL4030_MSTATEC_COMPLETE1 0x0b -#define TWL4030_MSTATEC_COMPLETE4 0x0e - -static bool allow_usb; -module_param(allow_usb, bool, 0644); -MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current"); - -struct twl4030_bci { - struct device *dev; - struct power_supply ac; - struct power_supply usb; - struct usb_phy *transceiver; - struct notifier_block usb_nb; - struct work_struct work; - int irq_chg; - int irq_bci; - struct regulator *usb_reg; - int usb_enabled; - - unsigned long event; -}; - -/* - * 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 = twl_i2c_read_u8(mod_no, &val, reg); - if (ret) - return ret; - - val &= ~clear; - val |= set; - - return twl_i2c_write_u8(mod_no, val, reg); -} - -static int twl4030_bci_read(u8 reg, u8 *val) -{ - return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg); -} - -static int twl4030_clear_set_boot_bci(u8 clear, u8 set) -{ - return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear, - TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set, - TWL4030_PM_MASTER_BOOT_BCI); -} - -static int twl4030bci_read_adc_val(u8 reg) -{ - int ret, temp; - u8 val; - - /* read MSB */ - ret = twl4030_bci_read(reg + 1, &val); - if (ret) - return ret; - - temp = (int)(val & 0x03) << 8; - - /* read LSB */ - ret = twl4030_bci_read(reg, &val); - if (ret) - return ret; - - return temp | val; -} - -/* - * Check if VBUS power is present - */ -static int twl4030_bci_have_vbus(struct twl4030_bci *bci) -{ - int ret; - u8 hwsts; - - ret = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &hwsts, - TWL4030_PM_MASTER_STS_HW_CONDITIONS); - if (ret < 0) - return 0; - - dev_dbg(bci->dev, "check_vbus: HW_CONDITIONS %02x\n", hwsts); - - /* in case we also have STS_USB_ID, VBUS is driven by TWL itself */ - if ((hwsts & TWL4030_STS_VBUS) && !(hwsts & TWL4030_STS_USB_ID)) - return 1; - - return 0; -} - -/* - * Enable/Disable USB Charge functionality. - */ -static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable) -{ - int ret; - - if (enable) { - /* Check for USB charger connected */ - if (!twl4030_bci_have_vbus(bci)) - return -ENODEV; - - /* - * Until we can find out what current the device can provide, - * require a module param to enable USB charging. - */ - if (!allow_usb) { - dev_warn(bci->dev, "USB charging is disabled.\n"); - return -EACCES; - } - - /* Need to keep regulator on */ - if (!bci->usb_enabled) { - regulator_enable(bci->usb_reg); - bci->usb_enabled = 1; - } - - /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */ - ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB); - if (ret < 0) - return ret; - - /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */ - ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0, - TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4); - } else { - ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0); - if (bci->usb_enabled) { - regulator_disable(bci->usb_reg); - bci->usb_enabled = 0; - } - } - - return ret; -} - -/* - * Enable/Disable AC Charge funtionality. - */ -static int twl4030_charger_enable_ac(bool enable) -{ - int ret; - - if (enable) - ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC); - else - ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0); - - return ret; -} - -/* - * Enable/Disable charging of Backup Battery. - */ -static int twl4030_charger_enable_backup(int uvolt, int uamp) -{ - int ret; - u8 flags; - - if (uvolt < 2500000 || - uamp < 25) { - /* disable charging of backup battery */ - ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, - TWL4030_BBCHEN, 0, TWL4030_BB_CFG); - return ret; - } - - flags = TWL4030_BBCHEN; - if (uvolt >= 3200000) - flags |= TWL4030_BBSEL_3V2; - else if (uvolt >= 3100000) - flags |= TWL4030_BBSEL_3V1; - else if (uvolt >= 3000000) - flags |= TWL4030_BBSEL_3V0; - else - flags |= TWL4030_BBSEL_2V5; - - if (uamp >= 1000) - flags |= TWL4030_BBISEL_1000uA; - else if (uamp >= 500) - flags |= TWL4030_BBISEL_500uA; - else if (uamp >= 150) - flags |= TWL4030_BBISEL_150uA; - else - flags |= TWL4030_BBISEL_25uA; - - ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, - TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK, - flags, - TWL4030_BB_CFG); - - return ret; -} - -/* - * TWL4030 CHG_PRES (AC charger presence) events - */ -static irqreturn_t twl4030_charger_interrupt(int irq, void *arg) -{ - struct twl4030_bci *bci = arg; - - dev_dbg(bci->dev, "CHG_PRES irq\n"); - power_supply_changed(&bci->ac); - power_supply_changed(&bci->usb); - - return IRQ_HANDLED; -} - -/* - * TWL4030 BCI monitoring events - */ -static irqreturn_t twl4030_bci_interrupt(int irq, void *arg) -{ - struct twl4030_bci *bci = arg; - u8 irqs1, irqs2; - int ret; - - ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1, - TWL4030_INTERRUPTS_BCIISR1A); - if (ret < 0) - return IRQ_HANDLED; - - ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2, - TWL4030_INTERRUPTS_BCIISR2A); - if (ret < 0) - return IRQ_HANDLED; - - dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1); - - if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) { - /* charger state change, inform the core */ - power_supply_changed(&bci->ac); - power_supply_changed(&bci->usb); - } - - /* various monitoring events, for now we just log them here */ - if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1)) - dev_warn(bci->dev, "battery temperature out of range\n"); - - if (irqs1 & TWL4030_BATSTS) - dev_crit(bci->dev, "battery disconnected\n"); - - if (irqs2 & TWL4030_VBATOV) - dev_crit(bci->dev, "VBAT overvoltage\n"); - - if (irqs2 & TWL4030_VBUSOV) - dev_crit(bci->dev, "VBUS overvoltage\n"); - - if (irqs2 & TWL4030_ACCHGOV) - dev_crit(bci->dev, "Ac charger overvoltage\n"); - - return IRQ_HANDLED; -} - -static void twl4030_bci_usb_work(struct work_struct *data) -{ - struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work); - - switch (bci->event) { - case USB_EVENT_VBUS: - case USB_EVENT_CHARGER: - twl4030_charger_enable_usb(bci, true); - break; - case USB_EVENT_NONE: - twl4030_charger_enable_usb(bci, false); - break; - } -} - -static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val, - void *priv) -{ - struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb); - - dev_dbg(bci->dev, "OTG notify %lu\n", val); - - bci->event = val; - schedule_work(&bci->work); - - return NOTIFY_OK; -} - -/* - * TI provided formulas: - * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85 - * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 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(TWL4030_BCIICHG); - if (curr < 0) - return curr; - - ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); - if (ret) - return ret; - - ret = (curr * 16618 - 850 * 10000) / 10; - if (bcictl1 & TWL4030_CGAIN) - ret *= 2; - - return ret; -} - -/* - * Returns the main charge FSM state - * Or < 0 on failure. - */ -static int twl4030bci_state(struct twl4030_bci *bci) -{ - int ret; - u8 state; - - ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state); - if (ret) { - pr_err("twl4030_bci: error reading BCIMSTATEC\n"); - return ret; - } - - dev_dbg(bci->dev, "state: %02x\n", state); - - return state; -} - -static int twl4030_bci_state_to_status(int state) -{ - state &= TWL4030_MSTATEC_MASK; - if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7) - return POWER_SUPPLY_STATUS_CHARGING; - else if (TWL4030_MSTATEC_COMPLETE1 <= state && - state <= TWL4030_MSTATEC_COMPLETE4) - return POWER_SUPPLY_STATUS_FULL; - else - return POWER_SUPPLY_STATUS_NOT_CHARGING; -} - -static int twl4030_bci_get_property(struct power_supply *psy, - enum power_supply_property psp, - union power_supply_propval *val) -{ - struct twl4030_bci *bci = dev_get_drvdata(psy->dev->parent); - int is_charging; - int state; - int ret; - - state = twl4030bci_state(bci); - if (state < 0) - return state; - - if (psy->type == POWER_SUPPLY_TYPE_USB) - is_charging = state & TWL4030_MSTATEC_USB; - else - is_charging = state & TWL4030_MSTATEC_AC; - - 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) - return -ENODATA; - if (psy->type == POWER_SUPPLY_TYPE_USB) { - ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS); - if (ret < 0) - return ret; - /* BCIVBUS uses ADCIN8, 7/1023 V/step */ - val->intval = ret * 6843; - } else { - ret = twl4030bci_read_adc_val(TWL4030_BCIVAC); - if (ret < 0) - return ret; - /* BCIVAC uses ADCIN11, 10/1023 V/step */ - val->intval = ret * 9775; - } - break; - case POWER_SUPPLY_PROP_CURRENT_NOW: - if (!is_charging) - return -ENODATA; - /* 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 int __init twl4030_bci_probe(struct platform_device *pdev) -{ - struct twl4030_bci *bci; - struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data; - int ret; - u32 reg; - - bci = kzalloc(sizeof(*bci), GFP_KERNEL); - if (bci == NULL) - return -ENOMEM; - - bci->dev = &pdev->dev; - bci->irq_chg = platform_get_irq(pdev, 0); - bci->irq_bci = platform_get_irq(pdev, 1); - - platform_set_drvdata(pdev, bci); - - bci->ac.name = "twl4030_ac"; - bci->ac.type = POWER_SUPPLY_TYPE_MAINS; - bci->ac.properties = twl4030_charger_props; - bci->ac.num_properties = ARRAY_SIZE(twl4030_charger_props); - bci->ac.get_property = twl4030_bci_get_property; - - ret = power_supply_register(&pdev->dev, &bci->ac); - if (ret) { - dev_err(&pdev->dev, "failed to register ac: %d\n", ret); - goto fail_register_ac; - } - - bci->usb.name = "twl4030_usb"; - bci->usb.type = POWER_SUPPLY_TYPE_USB; - bci->usb.properties = twl4030_charger_props; - bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props); - bci->usb.get_property = twl4030_bci_get_property; - - bci->usb_reg = regulator_get(bci->dev, "bci3v1"); - - ret = power_supply_register(&pdev->dev, &bci->usb); - if (ret) { - dev_err(&pdev->dev, "failed to register usb: %d\n", ret); - goto fail_register_usb; - } - - ret = request_threaded_irq(bci->irq_chg, NULL, - twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name, - bci); - if (ret < 0) { - dev_err(&pdev->dev, "could not request irq %d, status %d\n", - bci->irq_chg, ret); - goto fail_chg_irq; - } - - ret = request_threaded_irq(bci->irq_bci, NULL, - twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci); - if (ret < 0) { - dev_err(&pdev->dev, "could not request irq %d, status %d\n", - bci->irq_bci, ret); - goto fail_bci_irq; - } - - INIT_WORK(&bci->work, twl4030_bci_usb_work); - - bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2); - if (!IS_ERR_OR_NULL(bci->transceiver)) { - bci->usb_nb.notifier_call = twl4030_bci_usb_ncb; - usb_register_notifier(bci->transceiver, &bci->usb_nb); - } - - /* Enable interrupts now. */ - reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 | - TWL4030_TBATOR1 | TWL4030_BATSTS); - ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, - TWL4030_INTERRUPTS_BCIIMR1A); - if (ret < 0) { - dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret); - goto fail_unmask_interrupts; - } - - reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV); - ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, - TWL4030_INTERRUPTS_BCIIMR2A); - if (ret < 0) - dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret); - - twl4030_charger_enable_ac(true); - twl4030_charger_enable_usb(bci, true); - twl4030_charger_enable_backup(pdata->bb_uvolt, - pdata->bb_uamp); - - return 0; - -fail_unmask_interrupts: - if (!IS_ERR_OR_NULL(bci->transceiver)) { - usb_unregister_notifier(bci->transceiver, &bci->usb_nb); - usb_put_phy(bci->transceiver); - } - free_irq(bci->irq_bci, bci); -fail_bci_irq: - free_irq(bci->irq_chg, bci); -fail_chg_irq: - power_supply_unregister(&bci->usb); -fail_register_usb: - power_supply_unregister(&bci->ac); -fail_register_ac: - kfree(bci); - - return ret; -} - -static int __exit twl4030_bci_remove(struct platform_device *pdev) -{ - struct twl4030_bci *bci = platform_get_drvdata(pdev); - - twl4030_charger_enable_ac(false); - twl4030_charger_enable_usb(bci, false); - twl4030_charger_enable_backup(0, 0); - - /* mask interrupts */ - twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, - TWL4030_INTERRUPTS_BCIIMR1A); - twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, - TWL4030_INTERRUPTS_BCIIMR2A); - - if (!IS_ERR_OR_NULL(bci->transceiver)) { - usb_unregister_notifier(bci->transceiver, &bci->usb_nb); - usb_put_phy(bci->transceiver); - } - free_irq(bci->irq_bci, bci); - free_irq(bci->irq_chg, bci); - power_supply_unregister(&bci->usb); - power_supply_unregister(&bci->ac); - kfree(bci); - - return 0; -} - -static struct platform_driver twl4030_bci_driver = { - .driver = { - .name = "twl4030_bci", - .owner = THIS_MODULE, - }, - .remove = __exit_p(twl4030_bci_remove), -}; - -module_platform_driver_probe(twl4030_bci_driver, twl4030_bci_probe); - -MODULE_AUTHOR("Gražvydas Ignotas"); -MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:twl4030_bci"); |