diff options
Diffstat (limited to 'drivers/extcon')
| -rw-r--r-- | drivers/extcon/Kconfig | 32 | ||||
| -rw-r--r-- | drivers/extcon/Makefile | 7 | ||||
| -rw-r--r-- | drivers/extcon/extcon-max8997.c | 535 | ||||
| -rw-r--r-- | drivers/extcon/extcon_class.c | 832 | ||||
| -rw-r--r-- | drivers/extcon/extcon_gpio.c | 169 |
5 files changed, 1575 insertions, 0 deletions
diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig new file mode 100644 index 00000000000..29c5cf852ef --- /dev/null +++ b/drivers/extcon/Kconfig @@ -0,0 +1,32 @@ +menuconfig EXTCON + tristate "External Connector Class (extcon) support" + help + Say Y here to enable external connector class (extcon) support. + This allows monitoring external connectors by userspace + via sysfs and uevent and supports external connectors with + multiple states; i.e., an extcon that may have multiple + cables attached. For example, an external connector of a device + may be used to connect an HDMI cable and a AC adaptor, and to + host USB ports. Many of 30-pin connectors including PDMI are + also good examples. + +if EXTCON + +comment "Extcon Device Drivers" + +config EXTCON_GPIO + tristate "GPIO extcon support" + depends on GENERIC_GPIO + help + Say Y here to enable GPIO based extcon support. Note that GPIO + extcon supports single state per extcon instance. + +config EXTCON_MAX8997 + tristate "MAX8997 EXTCON Support" + depends on MFD_MAX8997 + help + If you say yes here you get support for the MUIC device of + Maxim MAX8997 PMIC. The MAX8997 MUIC is a USB port accessory + detector and switch. + +endif # MULTISTATE_SWITCH diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile new file mode 100644 index 00000000000..86020bdb6da --- /dev/null +++ b/drivers/extcon/Makefile @@ -0,0 +1,7 @@ +# +# Makefile for external connector class (extcon) devices +# + +obj-$(CONFIG_EXTCON) += extcon_class.o +obj-$(CONFIG_EXTCON_GPIO) += extcon_gpio.o +obj-$(CONFIG_EXTCON_MAX8997) += extcon-max8997.o diff --git a/drivers/extcon/extcon-max8997.c b/drivers/extcon/extcon-max8997.c new file mode 100644 index 00000000000..23416e44376 --- /dev/null +++ b/drivers/extcon/extcon-max8997.c @@ -0,0 +1,535 @@ +/* + * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC + * + * Copyright (C) 2012 Samsung Electrnoics + * Donggeun Kim <dg77.kim@samsung.com> + * + * 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. + * + * 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. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/kobject.h> +#include <linux/mfd/max8997.h> +#include <linux/mfd/max8997-private.h> +#include <linux/extcon.h> + +#define DEV_NAME "max8997-muic" + +/* MAX8997-MUIC STATUS1 register */ +#define STATUS1_ADC_SHIFT 0 +#define STATUS1_ADCLOW_SHIFT 5 +#define STATUS1_ADCERR_SHIFT 6 +#define STATUS1_ADC_MASK (0x1f << STATUS1_ADC_SHIFT) +#define STATUS1_ADCLOW_MASK (0x1 << STATUS1_ADCLOW_SHIFT) +#define STATUS1_ADCERR_MASK (0x1 << STATUS1_ADCERR_SHIFT) + +/* MAX8997-MUIC STATUS2 register */ +#define STATUS2_CHGTYP_SHIFT 0 +#define STATUS2_CHGDETRUN_SHIFT 3 +#define STATUS2_DCDTMR_SHIFT 4 +#define STATUS2_DBCHG_SHIFT 5 +#define STATUS2_VBVOLT_SHIFT 6 +#define STATUS2_CHGTYP_MASK (0x7 << STATUS2_CHGTYP_SHIFT) +#define STATUS2_CHGDETRUN_MASK (0x1 << STATUS2_CHGDETRUN_SHIFT) +#define STATUS2_DCDTMR_MASK (0x1 << STATUS2_DCDTMR_SHIFT) +#define STATUS2_DBCHG_MASK (0x1 << STATUS2_DBCHG_SHIFT) +#define STATUS2_VBVOLT_MASK (0x1 << STATUS2_VBVOLT_SHIFT) + +/* MAX8997-MUIC STATUS3 register */ +#define STATUS3_OVP_SHIFT 2 +#define STATUS3_OVP_MASK (0x1 << STATUS3_OVP_SHIFT) + +/* MAX8997-MUIC CONTROL1 register */ +#define COMN1SW_SHIFT 0 +#define COMP2SW_SHIFT 3 +#define COMN1SW_MASK (0x7 << COMN1SW_SHIFT) +#define COMP2SW_MASK (0x7 << COMP2SW_SHIFT) +#define SW_MASK (COMP2SW_MASK | COMN1SW_MASK) + +#define MAX8997_SW_USB ((1 << COMP2SW_SHIFT) | (1 << COMN1SW_SHIFT)) +#define MAX8997_SW_AUDIO ((2 << COMP2SW_SHIFT) | (2 << COMN1SW_SHIFT)) +#define MAX8997_SW_UART ((3 << COMP2SW_SHIFT) | (3 << COMN1SW_SHIFT)) +#define MAX8997_SW_OPEN ((0 << COMP2SW_SHIFT) | (0 << COMN1SW_SHIFT)) + +#define MAX8997_ADC_GROUND 0x00 +#define MAX8997_ADC_MHL 0x01 +#define MAX8997_ADC_JIG_USB_1 0x18 +#define MAX8997_ADC_JIG_USB_2 0x19 +#define MAX8997_ADC_DESKDOCK 0x1a +#define MAX8997_ADC_JIG_UART 0x1c +#define MAX8997_ADC_CARDOCK 0x1d +#define MAX8997_ADC_OPEN 0x1f + +struct max8997_muic_irq { + unsigned int irq; + const char *name; +}; + +static struct max8997_muic_irq muic_irqs[] = { + { MAX8997_MUICIRQ_ADCError, "muic-ADC_error" }, + { MAX8997_MUICIRQ_ADCLow, "muic-ADC_low" }, + { MAX8997_MUICIRQ_ADC, "muic-ADC" }, + { MAX8997_MUICIRQ_VBVolt, "muic-VB_voltage" }, + { MAX8997_MUICIRQ_DBChg, "muic-DB_charger" }, + { MAX8997_MUICIRQ_DCDTmr, "muic-DCD_timer" }, + { MAX8997_MUICIRQ_ChgDetRun, "muic-CDR_status" }, + { MAX8997_MUICIRQ_ChgTyp, "muic-charger_type" }, + { MAX8997_MUICIRQ_OVP, "muic-over_voltage" }, +}; + +struct max8997_muic_info { + struct device *dev; + struct i2c_client *muic; + struct max8997_muic_platform_data *muic_pdata; + + int irq; + struct work_struct irq_work; + + enum max8997_muic_charger_type pre_charger_type; + int pre_adc; + + struct mutex mutex; + + struct extcon_dev *edev; +}; + +const char *max8997_extcon_cable[] = { + [0] = "USB", + [1] = "USB-Host", + [2] = "TA", + [3] = "Fast-charger", + [4] = "Slow-charger", + [5] = "Charge-downstream", + [6] = "MHL", + [7] = "Dock-desk", + [7] = "Dock-card", + [8] = "JIG", + + NULL, +}; + +static int max8997_muic_handle_usb(struct max8997_muic_info *info, + enum max8997_muic_usb_type usb_type, bool attached) +{ + int ret = 0; + + if (usb_type == MAX8997_USB_HOST) { + /* switch to USB */ + ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1, + attached ? MAX8997_SW_USB : MAX8997_SW_OPEN, + SW_MASK); + if (ret) { + dev_err(info->dev, "failed to update muic register\n"); + goto out; + } + } + + switch (usb_type) { + case MAX8997_USB_HOST: + extcon_set_cable_state(info->edev, "USB-Host", attached); + break; + case MAX8997_USB_DEVICE: + extcon_set_cable_state(info->edev, "USB", attached); + break; + default: + ret = -EINVAL; + break; + } + +out: + return ret; +} + +static int max8997_muic_handle_dock(struct max8997_muic_info *info, + int adc, bool attached) +{ + int ret = 0; + + /* switch to AUDIO */ + ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1, + attached ? MAX8997_SW_AUDIO : MAX8997_SW_OPEN, + SW_MASK); + if (ret) { + dev_err(info->dev, "failed to update muic register\n"); + goto out; + } + + switch (adc) { + case MAX8997_ADC_DESKDOCK: + extcon_set_cable_state(info->edev, "Dock-desk", attached); + break; + case MAX8997_ADC_CARDOCK: + extcon_set_cable_state(info->edev, "Dock-card", attached); + break; + default: + ret = -EINVAL; + break; + } +out: + return ret; +} + +static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info, + bool attached) +{ + int ret = 0; + + /* switch to UART */ + ret = max8997_update_reg(info->muic, MAX8997_MUIC_REG_CONTROL1, + attached ? MAX8997_SW_UART : MAX8997_SW_OPEN, + SW_MASK); + if (ret) { + dev_err(info->dev, "failed to update muic register\n"); + goto out; + } + + extcon_set_cable_state(info->edev, "JIG", attached); +out: + return ret; +} + +static int max8997_muic_handle_adc_detach(struct max8997_muic_info *info) +{ + int ret = 0; + + switch (info->pre_adc) { + case MAX8997_ADC_GROUND: + ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, false); + break; + case MAX8997_ADC_MHL: + extcon_set_cable_state(info->edev, "MHL", false); + break; + case MAX8997_ADC_JIG_USB_1: + case MAX8997_ADC_JIG_USB_2: + ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, false); + break; + case MAX8997_ADC_DESKDOCK: + case MAX8997_ADC_CARDOCK: + ret = max8997_muic_handle_dock(info, info->pre_adc, false); + break; + case MAX8997_ADC_JIG_UART: + ret = max8997_muic_handle_jig_uart(info, false); + break; + default: + break; + } + + return ret; +} + +static int max8997_muic_handle_adc(struct max8997_muic_info *info, int adc) +{ + int ret = 0; + + switch (adc) { + case MAX8997_ADC_GROUND: + ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, true); + break; + case MAX8997_ADC_MHL: + extcon_set_cable_state(info->edev, "MHL", true); + break; + case MAX8997_ADC_JIG_USB_1: + case MAX8997_ADC_JIG_USB_2: + ret = max8997_muic_handle_usb(info, MAX8997_USB_DEVICE, true); + break; + case MAX8997_ADC_DESKDOCK: + case MAX8997_ADC_CARDOCK: + ret = max8997_muic_handle_dock(info, adc, true); + break; + case MAX8997_ADC_JIG_UART: + ret = max8997_muic_handle_jig_uart(info, true); + break; + case MAX8997_ADC_OPEN: + ret = max8997_muic_handle_adc_detach(info); + break; + default: + ret = -EINVAL; + goto out; + } + + info->pre_adc = adc; +out: + return ret; +} + +static int max8997_muic_handle_charger_type_detach( + struct max8997_muic_info *info) +{ + int ret = 0; + + switch (info->pre_charger_type) { + case MAX8997_CHARGER_TYPE_USB: + extcon_set_cable_state(info->edev, "USB", false); + break; + case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT: + extcon_set_cable_state(info->edev, "Charge-downstream", false); + break; + case MAX8997_CHARGER_TYPE_DEDICATED_CHG: + extcon_set_cable_state(info->edev, "TA", false); + break; + case MAX8997_CHARGER_TYPE_500MA: + extcon_set_cable_state(info->edev, "Slow-charger", false); + break; + case MAX8997_CHARGER_TYPE_1A: + extcon_set_cable_state(info->edev, "Fast-charger", false); + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + +static int max8997_muic_handle_charger_type(struct max8997_muic_info *info, + enum max8997_muic_charger_type charger_type) +{ + u8 adc; + int ret; + + ret = max8997_read_reg(info->muic, MAX8997_MUIC_REG_STATUS1, &adc); + if (ret) { + dev_err(info->dev, "failed to read muic register\n"); + goto out; + } + + switch (charger_type) { + case MAX8997_CHARGER_TYPE_NONE: + ret = max8997_muic_handle_charger_type_detach(info); + break; + case MAX8997_CHARGER_TYPE_USB: + if ((adc & STATUS1_ADC_MASK) == MAX8997_ADC_OPEN) { + max8997_muic_handle_usb(info, + MAX8997_USB_DEVICE, true); + } + break; + case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT: + extcon_set_cable_state(info->edev, "Charge-downstream", true); + break; + case MAX8997_CHARGER_TYPE_DEDICATED_CHG: + extcon_set_cable_state(info->edev, "TA", true); + break; + case MAX8997_CHARGER_TYPE_500MA: + extcon_set_cable_state(info->edev, "Slow-charger", true); + break; + case MAX8997_CHARGER_TYPE_1A: + extcon_set_cable_state(info->edev, "Fast-charger", true); + break; + default: + ret = -EINVAL; + goto out; + } + + info->pre_charger_type = charger_type; +out: + return ret; +} + +static void max8997_muic_irq_work(struct work_struct *work) +{ + struct max8997_muic_info *info = container_of(work, + struct max8997_muic_info, irq_work); + struct max8997_dev *max8997 = i2c_get_clientdata(info->muic); + u8 status[2]; + u8 adc, chg_type; + + int irq_type = info->irq - max8997->irq_base; + int ret; + + mutex_lock(&info->mutex); + + ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1, + 2, status); + if (ret) { + dev_err(info->dev, "failed to read muic register\n"); + mutex_unlock(&info->mutex); + return; + } + + dev_dbg(info->dev, "%s: STATUS1:0x%x, 2:0x%x\n", __func__, + status[0], status[1]); + + switch (irq_type) { + case MAX8997_MUICIRQ_ADC: + adc = status[0] & STATUS1_ADC_MASK; + adc >>= STATUS1_ADC_SHIFT; + + max8997_muic_handle_adc(info, adc); + break; + case MAX8997_MUICIRQ_ChgTyp: + chg_type = status[1] & STATUS2_CHGTYP_MASK; + chg_type >>= STATUS2_CHGTYP_SHIFT; + + max8997_muic_handle_charger_type(info, chg_type); + break; + default: + dev_info(info->dev, "misc interrupt: irq %d occurred\n", + irq_type); + break; + } + + mutex_unlock(&info->mutex); + + return; +} + +static irqreturn_t max8997_muic_irq_handler(int irq, void *data) +{ + struct max8997_muic_info *info = data; + + dev_dbg(info->dev, "irq:%d\n", irq); + info->irq = irq; + + schedule_work(&info->irq_work); + + return IRQ_HANDLED; +} + +static void max8997_muic_detect_dev(struct max8997_muic_info *info) +{ + int ret; + u8 status[2], adc, chg_type; + + ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1, + 2, status); + if (ret) { + dev_err(info->dev, "failed to read muic register\n"); + return; + } + + dev_info(info->dev, "STATUS1:0x%x, STATUS2:0x%x\n", + status[0], status[1]); + + adc = status[0] & STATUS1_ADC_MASK; + adc >>= STATUS1_ADC_SHIFT; + + chg_type = status[1] & STATUS2_CHGTYP_MASK; + chg_type >>= STATUS2_CHGTYP_SHIFT; + + max8997_muic_handle_adc(info, adc); + max8997_muic_handle_charger_type(info, chg_type); +} + +static int __devinit max8997_muic_probe(struct platform_device *pdev) +{ + struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent); + struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev); + struct max8997_muic_info *info; + int ret, i; + + info = kzalloc(sizeof(struct max8997_muic_info), GFP_KERNEL); + if (!info) { + dev_err(&pdev->dev, "failed to allocate memory\n"); + ret = -ENOMEM; + goto err_kfree; + } + + info->dev = &pdev->dev; + info->muic = max8997->muic; + + platform_set_drvdata(pdev, info); + mutex_init(&info->mutex); + + INIT_WORK(&info->irq_work, max8997_muic_irq_work); + + for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) { + struct max8997_muic_irq *muic_irq = &muic_irqs[i]; + + ret = request_threaded_irq(pdata->irq_base + muic_irq->irq, + NULL, max8997_muic_irq_handler, + 0, muic_irq->name, + info); + if (ret) { + dev_err(&pdev->dev, + "failed: irq request (IRQ: %d," + " error :%d)\n", + muic_irq->irq, ret); + goto err_irq; + } + } + + /* External connector */ + info->edev = kzalloc(sizeof(struct extcon_dev), GFP_KERNEL); + if (!info->edev) { + dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); + ret = -ENOMEM; + goto err_irq; + } + info->edev->name = DEV_NAME; + info->edev->supported_cable = max8997_extcon_cable; + ret = extcon_dev_register(info->edev, NULL); + if (ret) { + dev_err(&pdev->dev, "failed to register extcon device\n"); + goto err_extcon; + } + + /* Initialize registers according to platform data */ + if (pdata->muic_pdata) { + struct max8997_muic_platform_data *mdata = info->muic_pdata; + + for (i = 0; i < mdata->num_init_data; i++) { + max8997_write_reg(info->muic, mdata->init_data[i].addr, + mdata->init_data[i].data); + } + } + + /* Initial device detection */ + max8997_muic_detect_dev(info); + + return ret; + +err_extcon: + kfree(info->edev); +err_irq: + while (--i >= 0) + free_irq(pdata->irq_base + muic_irqs[i].irq, info); + kfree(info); +err_kfree: + return ret; +} + +static int __devexit max8997_muic_remove(struct platform_device *pdev) +{ + struct max8997_muic_info *info = platform_get_drvdata(pdev); + struct max8997_dev *max8997 = i2c_get_clientdata(info->muic); + int i; + + for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) + free_irq(max8997->irq_base + muic_irqs[i].irq, info); + cancel_work_sync(&info->irq_work); + + extcon_dev_unregister(info->edev); + + kfree(info); + + return 0; +} + +static struct platform_driver max8997_muic_driver = { + .driver = { + .name = DEV_NAME, + .owner = THIS_MODULE, + }, + .probe = max8997_muic_probe, + .remove = __devexit_p(max8997_muic_remove), +}; + +module_platform_driver(max8997_muic_driver); + +MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver"); +MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/extcon/extcon_class.c b/drivers/extcon/extcon_class.c new file mode 100644 index 00000000000..f598a700ec1 --- /dev/null +++ b/drivers/extcon/extcon_class.c @@ -0,0 +1,832 @@ +/* + * drivers/extcon/extcon_class.c + * + * External connector (extcon) class driver + * + * Copyright (C) 2012 Samsung Electronics + * Author: Donggeun Kim <dg77.kim@samsung.com> + * Author: MyungJoo Ham <myungjoo.ham@samsung.com> + * + * based on android/drivers/switch/switch_class.c + * Copyright (C) 2008 Google, Inc. + * Author: Mike Lockwood <lockwood@android.com> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + * +*/ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/err.h> +#include <linux/extcon.h> +#include <linux/slab.h> + +/* + * extcon_cable_name suggests the standard cable names for commonly used + * cable types. + * + * However, please do not use extcon_cable_name directly for extcon_dev + * struct's supported_cable pointer unless your device really supports + * every single port-type of the following cable names. Please choose cable + * names that are actually used in your extcon device. + */ +const char *extcon_cable_name[] = { + [EXTCON_USB] = "USB", + [EXTCON_USB_HOST] = "USB-Host", + [EXTCON_TA] = "TA", + [EXTCON_FAST_CHARGER] = "Fast-charger", + [EXTCON_SLOW_CHARGER] = "Slow-charger", + [EXTCON_CHARGE_DOWNSTREAM] = "Charge-downstream", + [EXTCON_HDMI] = "HDMI", + [EXTCON_MHL] = "MHL", + [EXTCON_DVI] = "DVI", + [EXTCON_VGA] = "VGA", + [EXTCON_DOCK] = "Dock", + [EXTCON_LINE_IN] = "Line-in", + [EXTCON_LINE_OUT] = "Line-out", + [EXTCON_MIC_IN] = "Microphone", + [EXTCON_HEADPHONE_OUT] = "Headphone", + [EXTCON_SPDIF_IN] = "SPDIF-in", + [EXTCON_SPDIF_OUT] = "SPDIF-out", + [EXTCON_VIDEO_IN] = "Video-in", + [EXTCON_VIDEO_OUT] = "Video-out", + [EXTCON_MECHANICAL] = "Mechanical", + + NULL, +}; + +struct class *extcon_class; +#if defined(CONFIG_ANDROID) +static struct class_compat *switch_class; +#endif /* CONFIG_ANDROID */ + +static LIST_HEAD(extcon_dev_list); +static DEFINE_MUTEX(extcon_dev_list_lock); + +/** + * check_mutually_exclusive - Check if new_state violates mutually_exclusive + * condition. + * @edev: the extcon device + * @new_state: new cable attach status for @edev + * + * Returns 0 if nothing violates. Returns the index + 1 for the first + * violated condition. + */ +static int check_mutually_exclusive(struct extcon_dev *edev, u32 new_state) +{ + int i = 0; + + if (!edev->mutually_exclusive) + return 0; + + for (i = 0; edev->mutually_exclusive[i]; i++) { + int count = 0, j; + u32 correspondants = new_state & edev->mutually_exclusive[i]; + u32 exp = 1; + + for (j = 0; j < 32; j++) { + if (exp & correspondants) + count++; + if (count > 1) + return i + 1; + exp <<= 1; + } + } + + return 0; +} + +static ssize_t state_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + int i, count = 0; + struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); + + if (edev->print_state) { + int ret = edev->print_state(edev, buf); + + if (ret >= 0) + return ret; + /* Use default if failed */ + } + + if (edev->max_supported == 0) + return sprintf(buf, "%u\n", edev->state); + + for (i = 0; i < SUPPORTED_CABLE_MAX; i++) { + if (!edev->supported_cable[i]) + break; + count += sprintf(buf + count, "%s=%d\n", + edev->supported_cable[i], + !!(edev->state & (1 << i))); + } + + return count; +} + +int extcon_set_state(struct extcon_dev *edev, u32 state); +static ssize_t state_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + u32 state; + ssize_t ret = 0; + struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); + + ret = sscanf(buf, "0x%x", &state); + if (ret == 0) + ret = -EINVAL; + else + ret = extcon_set_state(edev, state); + + if (ret < 0) + return ret; + + return count; +} + +static ssize_t name_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); + + /* Optional callback given by the user */ + if (edev->print_name) { + int ret = edev->print_name(edev, buf); + if (ret >= 0) + return ret; + } + + return sprintf(buf, "%s\n", dev_name(edev->dev)); +} + +static ssize_t cable_name_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct extcon_cable *cable = container_of(attr, struct extcon_cable, + attr_name); + + return sprintf(buf, "%s\n", + cable->edev->supported_cable[cable->cable_index]); +} + +static ssize_t cable_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct extcon_cable *cable = container_of(attr, struct extcon_cable, + attr_state); + + return sprintf(buf, "%d\n", + extcon_get_cable_state_(cable->edev, + cable->cable_index)); +} + +static ssize_t cable_state_store(struct device *dev, + struct device_attribute *attr, const char *buf, + size_t count) +{ + struct extcon_cable *cable = container_of(attr, struct extcon_cable, + attr_state); + int ret, state; + + ret = sscanf(buf, "%d", &state); + if (ret == 0) + ret = -EINVAL; + else + ret = extcon_set_cable_state_(cable->edev, cable->cable_index, + state); + + if (ret < 0) + return ret; + return count; +} + +/** + * extcon_update_state() - Update the cable attach states of the extcon device + * only for the masked bits. + * @edev: the extcon device + * @mask: the bit mask to designate updated bits. + * @state: new cable attach status for @edev + * + * Changing the state sends uevent with environment variable containing + * the name of extcon device (envp[0]) and the state output (envp[1]). + * Tizen uses this format for extcon device to get events from ports. + * Android uses this format as well. + * + * Note that the notifier provides which bits are changed in the state + * variable with the val parameter (second) to the callback. + */ +int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) +{ + char name_buf[120]; + char state_buf[120]; + char *prop_buf; + char *envp[3]; + int env_offset = 0; + int length; + unsigned long flags; + + spin_lock_irqsave(&edev->lock, flags); + + if (edev->state != ((edev->state & ~mask) | (state & mask))) { + u32 old_state = edev->state; + + if (check_mutually_exclusive(edev, (edev->state & ~mask) | + (state & mask))) { + spin_unlock_irqrestore(&edev->lock, flags); + return -EPERM; + } + + edev->state &= ~mask; + edev->state |= state & mask; + + raw_notifier_call_chain(&edev->nh, old_state, edev); + + /* This could be in interrupt handler */ + prop_buf = (char *)get_zeroed_page(GFP_ATOMIC); + if (prop_buf) { + length = name_show(edev->dev, NULL, prop_buf); + if (length > 0) { + if (prop_buf[length - 1] == '\n') + prop_buf[length - 1] = 0; + snprintf(name_buf, sizeof(name_buf), + "NAME=%s", prop_buf); + envp[env_offset++] = name_buf; + } + length = state_show(edev->dev, NULL, prop_buf); + if (length > 0) { + if (prop_buf[length - 1] == '\n') + prop_buf[length - 1] = 0; + snprintf(state_buf, sizeof(state_buf), + "STATE=%s", prop_buf); + envp[env_offset++] = state_buf; + } + envp[env_offset] = NULL; + /* Unlock early before uevent */ + spin_unlock_irqrestore(&edev->lock, flags); + + kobject_uevent_env(&edev->dev->kobj, KOBJ_CHANGE, envp); + free_page((unsigned long)prop_buf); + } else { + /* Unlock early before uevent */ + spin_unlock_irqrestore(&edev->lock, flags); + + dev_err(edev->dev, "out of memory in extcon_set_state\n"); + kobject_uevent(&edev->dev->kobj, KOBJ_CHANGE); + } + } else { + /* No changes */ + spin_unlock_irqrestore(&edev->lock, flags); + } + + return 0; +} +EXPORT_SYMBOL_GPL(extcon_update_state); + +/** + * extcon_set_state() - Set the cable attach states of the extcon device. + * @edev: the extcon device + * @state: new cable attach status for @edev + * + * Note that notifier provides which bits are changed in the state + * variable with the val parameter (second) to the callback. + */ +int extcon_set_state(struct extcon_dev *edev, u32 state) +{ + return extcon_update_state(edev, 0xffffffff, state); +} +EXPORT_SYMBOL_GPL(extcon_set_state); + +/** + * extcon_find_cable_index() - Get the cable index based on the cable name. + * @edev: the extcon device that has the cable. + * @cable_name: cable name to be searched. + * + * Note that accessing a cable state based on cable_index is faster than + * cable_name because using cable_name induces a loop with strncmp(). + * Thus, when get/set_cable_state is repeatedly used, using cable_index + * is recommended. + */ +int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name) +{ + int i; + + if (edev->supported_cable) { + for (i = 0; edev->supported_cable[i]; i++) { + if (!strncmp(edev->supported_cable[i], + cable_name, CABLE_NAME_MAX)) + return i; + } + } + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(extcon_find_cable_index); + +/** + * extcon_get_cable_state_() - Get the status of a specific cable. + * @edev: the extcon device that has the cable. + * @index: cable index that can be retrieved by extcon_find_cable_index(). + */ +int extcon_get_cable_state_(struct extcon_dev *edev, int index) +{ + if (index < 0 || (edev->max_supported && edev->max_supported <= index)) + return -EINVAL; + + return !!(edev->state & (1 << index)); +} +EXPORT_SYMBOL_GPL(extcon_get_cable_state_); + +/** + * extcon_get_cable_state() - Get the status of a specific cable. + * @edev: the extcon device that has the cable. + * @cable_name: cable name. + * + * Note that this is slower than extcon_get_cable_state_. + */ +int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) +{ + return extcon_get_cable_state_(edev, extcon_find_cable_index + (edev, cable_name)); +} +EXPORT_SYMBOL_GPL(extcon_get_cable_state); + +/** + * extcon_get_cable_state_() - Set the status of a specific cable. + * @edev: the extcon device that has the cable. + * @index: cable index that can be retrieved by extcon_find_cable_index(). + * @cable_state: the new cable status. The default semantics is + * true: attached / false: detached. + */ +int extcon_set_cable_state_(struct extcon_dev *edev, + int index, bool cable_state) +{ + u32 state; + + if (index < 0 || (edev->max_supported && edev->max_supported <= index)) + return -EINVAL; + + state = cable_state ? (1 << index) : 0; + return extcon_update_state(edev, 1 << index, state); +} +EXPORT_SYMBOL_GPL(extcon_set_cable_state_); + +/** + * extcon_get_cable_state() - Set the status of a specific cable. + * @edev: the extcon device that has the cable. + * @cable_name: cable name. + * @cable_state: the new cable status. The default semantics is + * true: attached / false: detached. + * + * Note that this is slower than extcon_set_cable_state_. + */ +int extcon_set_cable_state(struct extcon_dev *edev, + const char *cable_name, bool cable_state) +{ + return extcon_set_cable_state_(edev, extcon_find_cable_index + (edev, cable_name), cable_state); +} +EXPORT_SYMBOL_GPL(extcon_set_cable_state); + +/** + * extcon_get_extcon_dev() - Get the extcon device instance from the name + * @extcon_name: The extcon name provided with extcon_dev_register() + */ +struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) +{ + struct extcon_dev *sd; + + mutex_lock(&extcon_dev_list_lock); + list_for_each_entry(sd, &extcon_dev_list, entry) { + if (!strcmp(sd->name, extcon_name)) + goto out; + } + sd = NULL; +out: + mutex_unlock(&extcon_dev_list_lock); + return sd; +} +EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); + +static int _call_per_cable(struct notifier_block *nb, unsigned long val, + void *ptr) +{ + struct extcon_specific_cable_nb *obj = container_of(nb, + struct extcon_specific_cable_nb, internal_nb); + struct extcon_dev *edev = ptr; + + if ((val & (1 << obj->cable_index)) != + (edev->state & (1 << obj->cable_index))) { + bool cable_state = true; + + obj->previous_value = val; + + if (val & (1 << obj->cable_index)) + cable_state = false; + + return obj->user_nb->notifier_call(obj->user_nb, + cable_state, ptr); + } + + return NOTIFY_OK; +} + +/** + * extcon_register_interest() - Register a notifier for a state change of a + * specific cable, not a entier set of cables of a + * extcon device. + * @obj: an empty extcon_specific_cable_nb object to be returned. + * @extcon_name: the name of extcon device. + * @cable_name: the target cable name. + * @nb: the notifier block to get notified. + * + * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets + * the struct for you. + * + * extcon_register_interest is a helper function for those who want to get + * notification for a single specific cable's status change. If a user wants + * to get notification for any changes of all cables of a extcon device, + * he/she should use the general extcon_register_notifier(). + * + * Note that the second parameter given to the callback of nb (val) is + * "old_state", not the current state. The current state can be retrieved + * by looking at the third pameter (edev pointer)'s state value. + */ +int extcon_register_interest(struct extcon_specific_cable_nb *obj, + const char *extcon_name, const char *cable_name, + struct notifier_block *nb) +{ + if (!obj || !extcon_name || !cable_name || !nb) + return -EINVAL; + + obj->edev = extcon_get_extcon_dev(extcon_name); + if (!obj->edev) + return -ENODEV; + + obj->cable_index = extcon_find_cable_index(obj->edev, cable_name); + if (obj->cable_index < 0) + return -ENODEV; + + obj->user_nb = nb; + + obj->internal_nb.notifier_call = _call_per_cable; + + return raw_notifier_chain_register(&obj->edev->nh, &obj->internal_nb); +} + +/** + * extcon_unregister_interest() - Unregister the notifier registered by + * extcon_register_interest(). + * @obj: the extcon_specific_cable_nb object returned by + * extcon_register_interest(). + */ +int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) +{ + if (!obj) + return -EINVAL; + + return raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb); +} + +/** + * extcon_register_notifier() - Register a notifee to get notified by + * any attach status changes from the extcon. + * @edev: the extcon device. + * @nb: a notifier block to be registered. + * + * Note that the second parameter given to the callback of nb (val) is + * "old_state", not the current state. The current state can be retrieved + * by looking at the third pameter (edev pointer)'s state value. + */ +int extcon_register_notifier(struct extcon_dev *edev, + struct notifier_block *nb) +{ + return raw_notifier_chain_register(&edev->nh, nb); +} +EXPORT_SYMBOL_GPL(extcon_register_notifier); + +/** + * extcon_unregister_notifier() - Unregister a notifee from the extcon device. + * @edev: the extcon device. + * @nb: a registered notifier block to be unregistered. + */ +int extcon_unregister_notifier(struct extcon_dev *edev, + struct notifier_block *nb) +{ + return raw_notifier_chain_unregister(&edev->nh, nb); +} +EXPORT_SYMBOL_GPL(extcon_unregister_notifier); + +static struct device_attribute extcon_attrs[] = { + __ATTR(state, S_IRUGO | S_IWUSR, state_show, state_store), + __ATTR_RO(name), + __ATTR_NULL, +}; + +static int create_extcon_class(void) +{ + if (!extcon_class) { + extcon_class = class_create(THIS_MODULE, "extcon"); + if (IS_ERR(extcon_class)) + return PTR_ERR(extcon_class); + extcon_class->dev_attrs = extcon_attrs; + +#if defined(CONFIG_ANDROID) + switch_class = class_compat_register("switch"); + if (WARN(!switch_class, "cannot allocate")) + return -ENOMEM; +#endif /* CONFIG_ANDROID */ + } + + return 0; +} + +static void extcon_cleanup(struct extcon_dev *edev, bool skip) +{ + mutex_lock(&extcon_dev_list_lock); + list_del(&edev->entry); + mutex_unlock(&extcon_dev_list_lock); + + if (!skip && get_device(edev->dev)) { + int index; + + if (edev->mutually_exclusive && edev->max_supported) { + for (index = 0; edev->mutually_exclusive[index]; + index++) + kfree(edev->d_attrs_muex[index].attr.name); + kfree(edev->d_attrs_muex); + kfree(edev->attrs_muex); + } + + for (index = 0; index < edev->max_supported; index++) + kfree(edev->cables[index].attr_g.name); + + if (edev->max_supported) { + kfree(edev->extcon_dev_type.groups); + kfree(edev->cables); + } + + device_unregister(edev->dev); + put_device(edev->dev); + } + + kfree(edev->dev); +} + +static void extcon_dev_release(struct device *dev) +{ + struct extcon_dev *edev = (struct extcon_dev *) dev_get_drvdata(dev); + + extcon_cleanup(edev, true); +} + +static const char *muex_name = "mutually_exclusive"; +static void dummy_sysfs_dev_release(struct device *dev) +{ +} + +/** + * extcon_dev_register() - Register a new extcon device + * @edev : the new extcon device (should be allocated before calling) + * @dev : the parent device for this extcon device. + * + * Among the members of edev struct, please set the "user initializing data" + * in any case and set the "optional callbacks" if required. However, please + * do not set the values of "internal data", which are initialized by + * this function. + */ +int extcon_dev_register(struct extcon_dev *edev, struct device *dev) +{ + int ret, index = 0; + + if (!extcon_class) { + ret = create_extcon_class(); + if (ret < 0) + return ret; + } + + if (edev->supported_cable) { + /* Get size of array */ + for (index = 0; edev->supported_cable[index]; index++) + ; + edev->max_supported = index; + } else { + edev->max_supported = 0; + } + + if (index > SUPPORTED_CABLE_MAX) { + dev_err(edev->dev, "extcon: maximum number of supported cables exceeded.\n"); + return -EINVAL; + } + + edev->dev = kzalloc(sizeof(struct device), GFP_KERNEL); + if (!edev->dev) + return -ENOMEM; + edev->dev->parent = dev; + edev->dev->class = extcon_class; + edev->dev->release = extcon_dev_release; + + dev_set_name(edev->dev, edev->name ? edev->name : dev_name(dev)); + + if (edev->max_supported) { + char buf[10]; + char *str; + struct extcon_cable *cable; + + edev->cables = kzalloc(sizeof(struct extcon_cable) * + edev->max_supported, GFP_KERNEL); + if (!edev->cables) { + ret = -ENOMEM; + goto err_sysfs_alloc; + } + for (index = 0; index < edev->max_supported; index++) { + cable = &edev->cables[index]; + + snprintf(buf, 10, "cable.%d", index); + str = kzalloc(sizeof(char) * (strlen(buf) + 1), + GFP_KERNEL); + if (!str) { + for (index--; index >= 0; index--) { + cable = &edev->cables[index]; + kfree(cable->attr_g.name); + } + ret = -ENOMEM; + + goto err_alloc_cables; + } + strcpy(str, buf); + + cable->edev = edev; + cable->cable_index = index; + cable->attrs[0] = &cable->attr_name.attr; + cable->attrs[1] = &cable->attr_state.attr; + cable->attrs[2] = NULL; + cable->attr_g.name = str; + cable->attr_g.attrs = cable->attrs; + + cable->attr_name.attr.name = "name"; + cable->attr_name.attr.mode = 0444; + cable->attr_name.show = cable_name_show; + + cable->attr_state.attr.name = "state"; + cable->attr_state.attr.mode = 0644; + cable->attr_state.show = cable_state_show; + cable->attr_state.store = cable_state_store; + } + } + + if (edev->max_supported && edev->mutually_exclusive) { + char buf[80]; + char *name; + + /* Count the size of mutually_exclusive array */ + for (index = 0; edev->mutually_exclusive[index]; index++) + ; + + edev->attrs_muex = kzalloc(sizeof(struct attribute *) * + (index + 1), GFP_KERNEL); + if (!edev->attrs_muex) { + ret = -ENOMEM; + goto err_muex; + } + + edev->d_attrs_muex = kzalloc(sizeof(struct device_attribute) * + index, GFP_KERNEL); + if (!edev->d_attrs_muex) { + ret = -ENOMEM; + kfree(edev->attrs_muex); + goto err_muex; + } + + for (index = 0; edev->mutually_exclusive[index]; index++) { + sprintf(buf, "0x%x", edev->mutually_exclusive[index]); + name = kzalloc(sizeof(char) * (strlen(buf) + 1), + GFP_KERNEL); + if (!name) { + for (index--; index >= 0; index--) { + kfree(edev->d_attrs_muex[index].attr. + name); + } + kfree(edev->d_attrs_muex); + kfree(edev->attrs_muex); + ret = -ENOMEM; + goto err_muex; + } + strcpy(name, buf); + edev->d_attrs_muex[index].attr.name = name; + edev->d_attrs_muex[index].attr.mode = 0000; + edev->attrs_muex[index] = &edev->d_attrs_muex[index] + .attr; + } + edev->attr_g_muex.name = muex_name; + edev->attr_g_muex.attrs = edev->attrs_muex; + + } + + if (edev->max_supported) { + edev->extcon_dev_type.groups = + kzalloc(sizeof(struct attribute_group *) * + (edev->max_supported + 2), GFP_KERNEL); + if (!edev->extcon_dev_type.groups) { + ret = -ENOMEM; + goto err_alloc_groups; + } + + edev->extcon_dev_type.name = dev_name(edev->dev); + edev->extcon_dev_type.release = dummy_sysfs_dev_release; + + for (index = 0; index < edev->max_supported; index++) + edev->extcon_dev_type.groups[index] = + &edev->cables[index].attr_g; + if (edev->mutually_exclusive) + edev->extcon_dev_type.groups[index] = + &edev->attr_g_muex; + + edev->dev->type = &edev->extcon_dev_type; + } + + ret = device_register(edev->dev); + if (ret) { + put_device(edev->dev); + goto err_dev; + } +#if defined(CONFIG_ANDROID) + if (switch_class) + ret = class_compat_create_link(switch_class, edev->dev, + dev); +#endif /* CONFIG_ANDROID */ + + spin_lock_init(&edev->lock); + + RAW_INIT_NOTIFIER_HEAD(&edev->nh); + + dev_set_drvdata(edev->dev, edev); + edev->state = 0; + + mutex_lock(&extcon_dev_list_lock); + list_add(&edev->entry, &extcon_dev_list); + mutex_unlock(&extcon_dev_list_lock); + + return 0; + +err_dev: + if (edev->max_supported) + kfree(edev->extcon_dev_type.groups); +err_alloc_groups: + if (edev->max_supported && edev->mutually_exclusive) { + for (index = 0; edev->mutually_exclusive[index]; index++) + kfree(edev->d_attrs_muex[index].attr.name); + kfree(edev->d_attrs_muex); + kfree(edev->attrs_muex); + } +err_muex: + for (index = 0; index < edev->max_supported; index++) + kfree(edev->cables[index].attr_g.name); +err_alloc_cables: + if (edev->max_supported) + kfree(edev->cables); +err_sysfs_alloc: + kfree(edev->dev); + return ret; +} +EXPORT_SYMBOL_GPL(extcon_dev_register); + +/** + * extcon_dev_unregister() - Unregister the extcon device. + * @edev: the extcon device instance to be unregitered. + * + * Note that this does not call kfree(edev) because edev was not allocated + * by this class. + */ +void extcon_dev_unregister(struct extcon_dev *edev) +{ + extcon_cleanup(edev, false); +} +EXPORT_SYMBOL_GPL(extcon_dev_unregister); + +static int __init extcon_class_init(void) +{ + return create_extcon_class(); +} +module_init(extcon_class_init); + +static void __exit extcon_class_exit(void) +{ + class_destroy(extcon_class); +} +module_exit(extcon_class_exit); + +MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); +MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); +MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); +MODULE_DESCRIPTION("External connector (extcon) class driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/extcon/extcon_gpio.c b/drivers/extcon/extcon_gpio.c new file mode 100644 index 00000000000..fe7a07b4733 --- /dev/null +++ b/drivers/extcon/extcon_gpio.c @@ -0,0 +1,169 @@ +/* + * drivers/extcon/extcon_gpio.c + * + * Single-state GPIO extcon driver based on extcon class + * + * Copyright (C) 2008 Google, Inc. + * Author: Mike Lockwood <lockwood@android.com> + * + * Modified by MyungJoo Ham <myungjoo.ham@samsung.com> to support extcon + * (originally switch class is supported) + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + * +*/ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/extcon.h> +#include <linux/workqueue.h> +#include <linux/gpio.h> +#include <linux/extcon.h> +#include <linux/extcon/extcon_gpio.h> + +struct gpio_extcon_data { + struct extcon_dev edev; + unsigned gpio; + const char *state_on; + const char *state_off; + int irq; + struct delayed_work work; + unsigned long debounce_jiffies; +}; + +static void gpio_extcon_work(struct work_struct *work) +{ + int state; + struct gpio_extcon_data *data = + container_of(to_delayed_work(work), struct gpio_extcon_data, + work); + + state = gpio_get_value(data->gpio); + extcon_set_state(&data->edev, state); +} + +static irqreturn_t gpio_irq_handler(int irq, void *dev_id) +{ + struct gpio_extcon_data *extcon_data = dev_id; + + schedule_delayed_work(&extcon_data->work, + extcon_data->debounce_jiffies); + return IRQ_HANDLED; +} + +static ssize_t extcon_gpio_print_state(struct extcon_dev *edev, char *buf) +{ + struct gpio_extcon_data *extcon_data = + container_of(edev, struct gpio_extcon_data, edev); + const char *state; + if (extcon_get_state(edev)) + state = extcon_data->state_on; + else + state = extcon_data->state_off; + + if (state) + return sprintf(buf, "%s\n", state); + return -EINVAL; +} + +static int __devinit gpio_extcon_probe(struct platform_device *pdev) +{ + struct gpio_extcon_platform_data *pdata = pdev->dev.platform_data; + struct gpio_extcon_data *extcon_data; + int ret = 0; + + if (!pdata) + return -EBUSY; + if (!pdata->irq_flags) { + dev_err(&pdev->dev, "IRQ flag is not specified.\n"); + return -EINVAL; + } + + extcon_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data), + GFP_KERNEL); + if (!extcon_data) + return -ENOMEM; + + extcon_data->edev.name = pdata->name; + extcon_data->gpio = pdata->gpio; + extcon_data->state_on = pdata->state_on; + extcon_data->state_off = pdata->state_off; + if (pdata->state_on && pdata->state_off) + extcon_data->edev.print_state = extcon_gpio_print_state; + extcon_data->debounce_jiffies = msecs_to_jiffies(pdata->debounce); + + ret = extcon_dev_register(&extcon_data->edev, &pdev->dev); + if (ret < 0) + goto err_extcon_dev_register; + + ret = gpio_request_one(extcon_data->gpio, GPIOF_DIR_IN, pdev->name); + if (ret < 0) + goto err_request_gpio; + + INIT_DELAYED_WORK(&extcon_data->work, gpio_extcon_work); + + extcon_data->irq = gpio_to_irq(extcon_data->gpio); + if (extcon_data->irq < 0) { + ret = extcon_data->irq; + goto err_detect_irq_num_failed; + } + + ret = request_any_context_irq(extcon_data->irq, gpio_irq_handler, + pdata->irq_flags, pdev->name, + extcon_data); + if (ret < 0) + goto err_request_irq; + + /* Perform initial detection */ + gpio_extcon_work(&extcon_data->work.work); + + return 0; + +err_request_irq: +err_detect_irq_num_failed: + gpio_free(extcon_data->gpio); +err_request_gpio: + extcon_dev_unregister(&extcon_data->edev); +err_extcon_dev_register: + devm_kfree(&pdev->dev, extcon_data); + + return ret; +} + +static int __devexit gpio_extcon_remove(struct platform_device *pdev) +{ + struct gpio_extcon_data *extcon_data = platform_get_drvdata(pdev); + + cancel_delayed_work_sync(&extcon_data->work); + gpio_free(extcon_data->gpio); + extcon_dev_unregister(&extcon_data->edev); + devm_kfree(&pdev->dev, extcon_data); + + return 0; +} + +static struct platform_driver gpio_extcon_driver = { + .probe = gpio_extcon_probe, + .remove = __devexit_p(gpio_extcon_remove), + .driver = { + .name = "extcon-gpio", + .owner = THIS_MODULE, + }, +}; + +module_platform_driver(gpio_extcon_driver); + +MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); +MODULE_DESCRIPTION("GPIO extcon driver"); +MODULE_LICENSE("GPL"); |