diff options
Diffstat (limited to 'kernel/drivers/power/intel_mid_battery.c')
| -rw-r--r-- | kernel/drivers/power/intel_mid_battery.c | 796 |
1 files changed, 796 insertions, 0 deletions
diff --git a/kernel/drivers/power/intel_mid_battery.c b/kernel/drivers/power/intel_mid_battery.c new file mode 100644 index 000000000..9fa4acc10 --- /dev/null +++ b/kernel/drivers/power/intel_mid_battery.c @@ -0,0 +1,796 @@ +/* + * intel_mid_battery.c - Intel MID PMIC Battery Driver + * + * Copyright (C) 2009 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. + * + * 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. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * Author: Nithish Mahalingam <nithish.mahalingam@intel.com> + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/workqueue.h> +#include <linux/jiffies.h> +#include <linux/param.h> +#include <linux/device.h> +#include <linux/spi/spi.h> +#include <linux/platform_device.h> +#include <linux/power_supply.h> + +#include <asm/intel_scu_ipc.h> + +#define DRIVER_NAME "pmic_battery" + +/********************************************************************* + * Generic defines + *********************************************************************/ + +static int debug; +module_param(debug, int, 0444); +MODULE_PARM_DESC(debug, "Flag to enable PMIC Battery debug messages."); + +#define PMIC_BATT_DRV_INFO_UPDATED 1 +#define PMIC_BATT_PRESENT 1 +#define PMIC_BATT_NOT_PRESENT 0 +#define PMIC_USB_PRESENT PMIC_BATT_PRESENT +#define PMIC_USB_NOT_PRESENT PMIC_BATT_NOT_PRESENT + +/* pmic battery register related */ +#define PMIC_BATT_CHR_SCHRGINT_ADDR 0xD2 +#define PMIC_BATT_CHR_SBATOVP_MASK (1 << 1) +#define PMIC_BATT_CHR_STEMP_MASK (1 << 2) +#define PMIC_BATT_CHR_SCOMP_MASK (1 << 3) +#define PMIC_BATT_CHR_SUSBDET_MASK (1 << 4) +#define PMIC_BATT_CHR_SBATDET_MASK (1 << 5) +#define PMIC_BATT_CHR_SDCLMT_MASK (1 << 6) +#define PMIC_BATT_CHR_SUSBOVP_MASK (1 << 7) +#define PMIC_BATT_CHR_EXCPT_MASK 0x86 + +#define PMIC_BATT_ADC_ACCCHRG_MASK (1 << 31) +#define PMIC_BATT_ADC_ACCCHRGVAL_MASK 0x7FFFFFFF + +/* pmic ipc related */ +#define PMIC_BATT_CHR_IPC_FCHRG_SUBID 0x4 +#define PMIC_BATT_CHR_IPC_TCHRG_SUBID 0x6 + +/* types of battery charging */ +enum batt_charge_type { + BATT_USBOTG_500MA_CHARGE, + BATT_USBOTG_TRICKLE_CHARGE, +}; + +/* valid battery events */ +enum batt_event { + BATT_EVENT_BATOVP_EXCPT, + BATT_EVENT_USBOVP_EXCPT, + BATT_EVENT_TEMP_EXCPT, + BATT_EVENT_DCLMT_EXCPT, + BATT_EVENT_EXCPT +}; + + +/********************************************************************* + * Battery properties + *********************************************************************/ + +/* + * pmic battery info + */ +struct pmic_power_module_info { + bool is_dev_info_updated; + struct device *dev; + /* pmic battery data */ + unsigned long update_time; /* jiffies when data read */ + unsigned int usb_is_present; + unsigned int batt_is_present; + unsigned int batt_health; + unsigned int usb_health; + unsigned int batt_status; + unsigned int batt_charge_now; /* in mAS */ + unsigned int batt_prev_charge_full; /* in mAS */ + unsigned int batt_charge_rate; /* in units per second */ + + struct power_supply *usb; + struct power_supply *batt; + int irq; /* GPE_ID or IRQ# */ + struct workqueue_struct *monitor_wqueue; + struct delayed_work monitor_battery; + struct work_struct handler; +}; + +static unsigned int delay_time = 2000; /* in ms */ + +/* + * pmic ac properties + */ +static enum power_supply_property pmic_usb_props[] = { + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_HEALTH, +}; + +/* + * pmic battery properties + */ +static enum power_supply_property pmic_battery_props[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_CHARGE_NOW, + POWER_SUPPLY_PROP_CHARGE_FULL, +}; + + +/* + * Glue functions for talking to the IPC + */ + +struct battery_property { + u32 capacity; /* Charger capacity */ + u8 crnt; /* Quick charge current value*/ + u8 volt; /* Fine adjustment of constant charge voltage */ + u8 prot; /* CHRGPROT register value */ + u8 prot2; /* CHRGPROT1 register value */ + u8 timer; /* Charging timer */ +}; + +#define IPCMSG_BATTERY 0xEF + +/* Battery coulomb counter accumulator commands */ +#define IPC_CMD_CC_WR 0 /* Update coulomb counter value */ +#define IPC_CMD_CC_RD 1 /* Read coulomb counter value */ +#define IPC_CMD_BATTERY_PROPERTY 2 /* Read Battery property */ + +/** + * pmic_scu_ipc_battery_cc_read - read battery cc + * @value: battery coulomb counter read + * + * Reads the battery couloumb counter value, returns 0 on success, or + * an error code + * + * This function may sleep. Locking for SCU accesses is handled for + * the caller. + */ +static int pmic_scu_ipc_battery_cc_read(u32 *value) +{ + return intel_scu_ipc_command(IPCMSG_BATTERY, IPC_CMD_CC_RD, + NULL, 0, value, 1); +} + +/** + * pmic_scu_ipc_battery_property_get - fetch properties + * @prop: battery properties + * + * Retrieve the battery properties from the power management + * + * This function may sleep. Locking for SCU accesses is handled for + * the caller. + */ +static int pmic_scu_ipc_battery_property_get(struct battery_property *prop) +{ + u32 data[3]; + u8 *p = (u8 *)&data[1]; + int err = intel_scu_ipc_command(IPCMSG_BATTERY, + IPC_CMD_BATTERY_PROPERTY, NULL, 0, data, 3); + + prop->capacity = data[0]; + prop->crnt = *p++; + prop->volt = *p++; + prop->prot = *p++; + prop->prot2 = *p++; + prop->timer = *p++; + + return err; +} + +/** + * pmic_scu_ipc_set_charger - set charger + * @charger: charger to select + * + * Switch the charging mode for the SCU + */ + +static int pmic_scu_ipc_set_charger(int charger) +{ + return intel_scu_ipc_simple_command(IPCMSG_BATTERY, charger); +} + +/** + * pmic_battery_log_event - log battery events + * @event: battery event to be logged + * Context: can sleep + * + * There are multiple battery events which may be of interest to users; + * this battery function logs the different battery events onto the + * kernel log messages. + */ +static void pmic_battery_log_event(enum batt_event event) +{ + printk(KERN_WARNING "pmic-battery: "); + switch (event) { + case BATT_EVENT_BATOVP_EXCPT: + printk(KERN_CONT "battery overvoltage condition\n"); + break; + case BATT_EVENT_USBOVP_EXCPT: + printk(KERN_CONT "usb charger overvoltage condition\n"); + break; + case BATT_EVENT_TEMP_EXCPT: + printk(KERN_CONT "high battery temperature condition\n"); + break; + case BATT_EVENT_DCLMT_EXCPT: + printk(KERN_CONT "over battery charge current condition\n"); + break; + default: + printk(KERN_CONT "charger/battery exception %d\n", event); + break; + } +} + +/** + * pmic_battery_read_status - read battery status information + * @pbi: device info structure to update the read information + * Context: can sleep + * + * PMIC power source information need to be updated based on the data read + * from the PMIC battery registers. + * + */ +static void pmic_battery_read_status(struct pmic_power_module_info *pbi) +{ + unsigned int update_time_intrvl; + unsigned int chrg_val; + u32 ccval; + u8 r8; + struct battery_property batt_prop; + int batt_present = 0; + int usb_present = 0; + int batt_exception = 0; + + /* make sure the last batt_status read happened delay_time before */ + if (pbi->update_time && time_before(jiffies, pbi->update_time + + msecs_to_jiffies(delay_time))) + return; + + update_time_intrvl = jiffies_to_msecs(jiffies - pbi->update_time); + pbi->update_time = jiffies; + + /* read coulomb counter registers and schrgint register */ + if (pmic_scu_ipc_battery_cc_read(&ccval)) { + dev_warn(pbi->dev, "%s(): ipc config cmd failed\n", + __func__); + return; + } + + if (intel_scu_ipc_ioread8(PMIC_BATT_CHR_SCHRGINT_ADDR, &r8)) { + dev_warn(pbi->dev, "%s(): ipc pmic read failed\n", + __func__); + return; + } + + /* + * set pmic_power_module_info members based on pmic register values + * read. + */ + + /* set batt_is_present */ + if (r8 & PMIC_BATT_CHR_SBATDET_MASK) { + pbi->batt_is_present = PMIC_BATT_PRESENT; + batt_present = 1; + } else { + pbi->batt_is_present = PMIC_BATT_NOT_PRESENT; + pbi->batt_health = POWER_SUPPLY_HEALTH_UNKNOWN; + pbi->batt_status = POWER_SUPPLY_STATUS_UNKNOWN; + } + + /* set batt_health */ + if (batt_present) { + if (r8 & PMIC_BATT_CHR_SBATOVP_MASK) { + pbi->batt_health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + pbi->batt_status = POWER_SUPPLY_STATUS_NOT_CHARGING; + pmic_battery_log_event(BATT_EVENT_BATOVP_EXCPT); + batt_exception = 1; + } else if (r8 & PMIC_BATT_CHR_STEMP_MASK) { + pbi->batt_health = POWER_SUPPLY_HEALTH_OVERHEAT; + pbi->batt_status = POWER_SUPPLY_STATUS_NOT_CHARGING; + pmic_battery_log_event(BATT_EVENT_TEMP_EXCPT); + batt_exception = 1; + } else { + pbi->batt_health = POWER_SUPPLY_HEALTH_GOOD; + if (r8 & PMIC_BATT_CHR_SDCLMT_MASK) { + /* PMIC will change charging current automatically */ + pmic_battery_log_event(BATT_EVENT_DCLMT_EXCPT); + } + } + } + + /* set usb_is_present */ + if (r8 & PMIC_BATT_CHR_SUSBDET_MASK) { + pbi->usb_is_present = PMIC_USB_PRESENT; + usb_present = 1; + } else { + pbi->usb_is_present = PMIC_USB_NOT_PRESENT; + pbi->usb_health = POWER_SUPPLY_HEALTH_UNKNOWN; + } + + if (usb_present) { + if (r8 & PMIC_BATT_CHR_SUSBOVP_MASK) { + pbi->usb_health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + pmic_battery_log_event(BATT_EVENT_USBOVP_EXCPT); + } else { + pbi->usb_health = POWER_SUPPLY_HEALTH_GOOD; + } + } + + chrg_val = ccval & PMIC_BATT_ADC_ACCCHRGVAL_MASK; + + /* set batt_prev_charge_full to battery capacity the first time */ + if (!pbi->is_dev_info_updated) { + if (pmic_scu_ipc_battery_property_get(&batt_prop)) { + dev_warn(pbi->dev, "%s(): ipc config cmd failed\n", + __func__); + return; + } + pbi->batt_prev_charge_full = batt_prop.capacity; + } + + /* set batt_status */ + if (batt_present && !batt_exception) { + if (r8 & PMIC_BATT_CHR_SCOMP_MASK) { + pbi->batt_status = POWER_SUPPLY_STATUS_FULL; + pbi->batt_prev_charge_full = chrg_val; + } else if (ccval & PMIC_BATT_ADC_ACCCHRG_MASK) { + pbi->batt_status = POWER_SUPPLY_STATUS_DISCHARGING; + } else { + pbi->batt_status = POWER_SUPPLY_STATUS_CHARGING; + } + } + + /* set batt_charge_rate */ + if (pbi->is_dev_info_updated && batt_present && !batt_exception) { + if (pbi->batt_status == POWER_SUPPLY_STATUS_DISCHARGING) { + if (pbi->batt_charge_now - chrg_val) { + pbi->batt_charge_rate = ((pbi->batt_charge_now - + chrg_val) * 1000 * 60) / + update_time_intrvl; + } + } else if (pbi->batt_status == POWER_SUPPLY_STATUS_CHARGING) { + if (chrg_val - pbi->batt_charge_now) { + pbi->batt_charge_rate = ((chrg_val - + pbi->batt_charge_now) * 1000 * 60) / + update_time_intrvl; + } + } else + pbi->batt_charge_rate = 0; + } else { + pbi->batt_charge_rate = -1; + } + + /* batt_charge_now */ + if (batt_present && !batt_exception) + pbi->batt_charge_now = chrg_val; + else + pbi->batt_charge_now = -1; + + pbi->is_dev_info_updated = PMIC_BATT_DRV_INFO_UPDATED; +} + +/** + * pmic_usb_get_property - usb power source get property + * @psy: usb power supply context + * @psp: usb power source property + * @val: usb power source property value + * Context: can sleep + * + * PMIC usb power source property needs to be provided to power_supply + * subsytem for it to provide the information to users. + */ +static int pmic_usb_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct pmic_power_module_info *pbi = power_supply_get_drvdata(psy); + + /* update pmic_power_module_info members */ + pmic_battery_read_status(pbi); + + switch (psp) { + case POWER_SUPPLY_PROP_PRESENT: + val->intval = pbi->usb_is_present; + break; + case POWER_SUPPLY_PROP_HEALTH: + val->intval = pbi->usb_health; + break; + default: + return -EINVAL; + } + + return 0; +} + +static inline unsigned long mAStouAh(unsigned long v) +{ + /* seconds to hours, mA to µA */ + return (v * 1000) / 3600; +} + +/** + * pmic_battery_get_property - battery power source get property + * @psy: battery power supply context + * @psp: battery power source property + * @val: battery power source property value + * Context: can sleep + * + * PMIC battery power source property needs to be provided to power_supply + * subsytem for it to provide the information to users. + */ +static int pmic_battery_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct pmic_power_module_info *pbi = power_supply_get_drvdata(psy); + + /* update pmic_power_module_info members */ + pmic_battery_read_status(pbi); + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + val->intval = pbi->batt_status; + break; + case POWER_SUPPLY_PROP_HEALTH: + val->intval = pbi->batt_health; + break; + case POWER_SUPPLY_PROP_PRESENT: + val->intval = pbi->batt_is_present; + break; + case POWER_SUPPLY_PROP_CHARGE_NOW: + val->intval = mAStouAh(pbi->batt_charge_now); + break; + case POWER_SUPPLY_PROP_CHARGE_FULL: + val->intval = mAStouAh(pbi->batt_prev_charge_full); + break; + default: + return -EINVAL; + } + + return 0; +} + +/** + * pmic_battery_monitor - monitor battery status + * @work: work structure + * Context: can sleep + * + * PMIC battery status needs to be monitored for any change + * and information needs to be frequently updated. + */ +static void pmic_battery_monitor(struct work_struct *work) +{ + struct pmic_power_module_info *pbi = container_of(work, + struct pmic_power_module_info, monitor_battery.work); + + /* update pmic_power_module_info members */ + pmic_battery_read_status(pbi); + queue_delayed_work(pbi->monitor_wqueue, &pbi->monitor_battery, HZ * 10); +} + +/** + * pmic_battery_set_charger - set battery charger + * @pbi: device info structure + * @chrg: charge mode to set battery charger in + * Context: can sleep + * + * PMIC battery charger needs to be enabled based on the usb charge + * capabilities connected to the platform. + */ +static int pmic_battery_set_charger(struct pmic_power_module_info *pbi, + enum batt_charge_type chrg) +{ + int retval; + + /* set usblmt bits and chrgcntl register bits appropriately */ + switch (chrg) { + case BATT_USBOTG_500MA_CHARGE: + retval = pmic_scu_ipc_set_charger(PMIC_BATT_CHR_IPC_FCHRG_SUBID); + break; + case BATT_USBOTG_TRICKLE_CHARGE: + retval = pmic_scu_ipc_set_charger(PMIC_BATT_CHR_IPC_TCHRG_SUBID); + break; + default: + dev_warn(pbi->dev, "%s(): out of range usb charger " + "charge detected\n", __func__); + return -EINVAL; + } + + if (retval) { + dev_warn(pbi->dev, "%s(): ipc pmic read failed\n", + __func__); + return retval; + } + + return 0; +} + +/** + * pmic_battery_interrupt_handler - pmic battery interrupt handler + * Context: interrupt context + * + * PMIC battery interrupt handler which will be called with either + * battery full condition occurs or usb otg & battery connect + * condition occurs. + */ +static irqreturn_t pmic_battery_interrupt_handler(int id, void *dev) +{ + struct pmic_power_module_info *pbi = dev; + + schedule_work(&pbi->handler); + + return IRQ_HANDLED; +} + +/** + * pmic_battery_handle_intrpt - pmic battery service interrupt + * @work: work structure + * Context: can sleep + * + * PMIC battery needs to either update the battery status as full + * if it detects battery full condition caused the interrupt or needs + * to enable battery charger if it detects usb and battery detect + * caused the source of interrupt. + */ +static void pmic_battery_handle_intrpt(struct work_struct *work) +{ + struct pmic_power_module_info *pbi = container_of(work, + struct pmic_power_module_info, handler); + enum batt_charge_type chrg; + u8 r8; + + if (intel_scu_ipc_ioread8(PMIC_BATT_CHR_SCHRGINT_ADDR, &r8)) { + dev_warn(pbi->dev, "%s(): ipc pmic read failed\n", + __func__); + return; + } + /* find the cause of the interrupt */ + if (r8 & PMIC_BATT_CHR_SBATDET_MASK) { + pbi->batt_is_present = PMIC_BATT_PRESENT; + } else { + pbi->batt_is_present = PMIC_BATT_NOT_PRESENT; + pbi->batt_health = POWER_SUPPLY_HEALTH_UNKNOWN; + pbi->batt_status = POWER_SUPPLY_STATUS_UNKNOWN; + return; + } + + if (r8 & PMIC_BATT_CHR_EXCPT_MASK) { + pbi->batt_health = POWER_SUPPLY_HEALTH_UNKNOWN; + pbi->batt_status = POWER_SUPPLY_STATUS_NOT_CHARGING; + pbi->usb_health = POWER_SUPPLY_HEALTH_UNKNOWN; + pmic_battery_log_event(BATT_EVENT_EXCPT); + return; + } else { + pbi->batt_health = POWER_SUPPLY_HEALTH_GOOD; + pbi->usb_health = POWER_SUPPLY_HEALTH_GOOD; + } + + if (r8 & PMIC_BATT_CHR_SCOMP_MASK) { + u32 ccval; + pbi->batt_status = POWER_SUPPLY_STATUS_FULL; + + if (pmic_scu_ipc_battery_cc_read(&ccval)) { + dev_warn(pbi->dev, "%s(): ipc config cmd " + "failed\n", __func__); + return; + } + pbi->batt_prev_charge_full = ccval & + PMIC_BATT_ADC_ACCCHRGVAL_MASK; + return; + } + + if (r8 & PMIC_BATT_CHR_SUSBDET_MASK) { + pbi->usb_is_present = PMIC_USB_PRESENT; + } else { + pbi->usb_is_present = PMIC_USB_NOT_PRESENT; + pbi->usb_health = POWER_SUPPLY_HEALTH_UNKNOWN; + return; + } + + /* setup battery charging */ + +#if 0 + /* check usb otg power capability and set charger accordingly */ + retval = langwell_udc_maxpower(&power); + if (retval) { + dev_warn(pbi->dev, + "%s(): usb otg power query failed with error code %d\n", + __func__, retval); + return; + } + + if (power >= 500) + chrg = BATT_USBOTG_500MA_CHARGE; + else +#endif + chrg = BATT_USBOTG_TRICKLE_CHARGE; + + /* enable battery charging */ + if (pmic_battery_set_charger(pbi, chrg)) { + dev_warn(pbi->dev, + "%s(): failed to set up battery charging\n", __func__); + return; + } + + dev_dbg(pbi->dev, + "pmic-battery: %s() - setting up battery charger successful\n", + __func__); +} + +/* + * Description of power supplies + */ +static const struct power_supply_desc pmic_usb_desc = { + .name = "pmic-usb", + .type = POWER_SUPPLY_TYPE_USB, + .properties = pmic_usb_props, + .num_properties = ARRAY_SIZE(pmic_usb_props), + .get_property = pmic_usb_get_property, +}; + +static const struct power_supply_desc pmic_batt_desc = { + .name = "pmic-batt", + .type = POWER_SUPPLY_TYPE_BATTERY, + .properties = pmic_battery_props, + .num_properties = ARRAY_SIZE(pmic_battery_props), + .get_property = pmic_battery_get_property, +}; + +/** + * pmic_battery_probe - pmic battery initialize + * @irq: pmic battery device irq + * @dev: pmic battery device structure + * Context: can sleep + * + * PMIC battery initializes its internal data structue and other + * infrastructure components for it to work as expected. + */ +static int probe(int irq, struct device *dev) +{ + int retval = 0; + struct pmic_power_module_info *pbi; + struct power_supply_config psy_cfg = {}; + + dev_dbg(dev, "pmic-battery: found pmic battery device\n"); + + pbi = kzalloc(sizeof(*pbi), GFP_KERNEL); + if (!pbi) { + dev_err(dev, "%s(): memory allocation failed\n", + __func__); + return -ENOMEM; + } + + pbi->dev = dev; + pbi->irq = irq; + dev_set_drvdata(dev, pbi); + psy_cfg.drv_data = pbi; + + /* initialize all required framework before enabling interrupts */ + INIT_WORK(&pbi->handler, pmic_battery_handle_intrpt); + INIT_DELAYED_WORK(&pbi->monitor_battery, pmic_battery_monitor); + pbi->monitor_wqueue = + create_singlethread_workqueue(dev_name(dev)); + if (!pbi->monitor_wqueue) { + dev_err(dev, "%s(): wqueue init failed\n", __func__); + retval = -ESRCH; + goto wqueue_failed; + } + + /* register interrupt */ + retval = request_irq(pbi->irq, pmic_battery_interrupt_handler, + 0, DRIVER_NAME, pbi); + if (retval) { + dev_err(dev, "%s(): cannot get IRQ\n", __func__); + goto requestirq_failed; + } + + /* register pmic-batt with power supply subsystem */ + pbi->batt = power_supply_register(dev, &pmic_usb_desc, &psy_cfg); + if (IS_ERR(pbi->batt)) { + dev_err(dev, + "%s(): failed to register pmic battery device with power supply subsystem\n", + __func__); + retval = PTR_ERR(pbi->batt); + goto power_reg_failed; + } + + dev_dbg(dev, "pmic-battery: %s() - pmic battery device " + "registration with power supply subsystem successful\n", + __func__); + + queue_delayed_work(pbi->monitor_wqueue, &pbi->monitor_battery, HZ * 1); + + /* register pmic-usb with power supply subsystem */ + pbi->usb = power_supply_register(dev, &pmic_batt_desc, &psy_cfg); + if (IS_ERR(pbi->usb)) { + dev_err(dev, + "%s(): failed to register pmic usb device with power supply subsystem\n", + __func__); + retval = PTR_ERR(pbi->usb); + goto power_reg_failed_1; + } + + if (debug) + printk(KERN_INFO "pmic-battery: %s() - pmic usb device " + "registration with power supply subsystem successful\n", + __func__); + + return retval; + +power_reg_failed_1: + power_supply_unregister(pbi->batt); +power_reg_failed: + cancel_delayed_work_sync(&pbi->monitor_battery); +requestirq_failed: + destroy_workqueue(pbi->monitor_wqueue); +wqueue_failed: + kfree(pbi); + + return retval; +} + +static int platform_pmic_battery_probe(struct platform_device *pdev) +{ + return probe(pdev->id, &pdev->dev); +} + +/** + * pmic_battery_remove - pmic battery finalize + * @dev: pmic battery device structure + * Context: can sleep + * + * PMIC battery finalizes its internal data structue and other + * infrastructure components that it initialized in + * pmic_battery_probe. + */ + +static int platform_pmic_battery_remove(struct platform_device *pdev) +{ + struct pmic_power_module_info *pbi = platform_get_drvdata(pdev); + + free_irq(pbi->irq, pbi); + cancel_delayed_work_sync(&pbi->monitor_battery); + destroy_workqueue(pbi->monitor_wqueue); + + power_supply_unregister(pbi->usb); + power_supply_unregister(pbi->batt); + + cancel_work_sync(&pbi->handler); + kfree(pbi); + return 0; +} + +static struct platform_driver platform_pmic_battery_driver = { + .driver = { + .name = DRIVER_NAME, + }, + .probe = platform_pmic_battery_probe, + .remove = platform_pmic_battery_remove, +}; + +module_platform_driver(platform_pmic_battery_driver); + +MODULE_AUTHOR("Nithish Mahalingam <nithish.mahalingam@intel.com>"); +MODULE_DESCRIPTION("Intel Moorestown PMIC Battery Driver"); +MODULE_LICENSE("GPL"); |