diff options
Diffstat (limited to 'drivers/extcon/extcon-max14577.c')
| -rw-r--r-- | drivers/extcon/extcon-max14577.c | 752 |
1 files changed, 752 insertions, 0 deletions
diff --git a/drivers/extcon/extcon-max14577.c b/drivers/extcon/extcon-max14577.c new file mode 100644 index 000000000000..3846941801b8 --- /dev/null +++ b/drivers/extcon/extcon-max14577.c @@ -0,0 +1,752 @@ +/* + * extcon-max14577.c - MAX14577 extcon driver to support MAX14577 MUIC + * + * Copyright (C) 2013 Samsung Electrnoics + * Chanwoo Choi <cw00.choi@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/interrupt.h> +#include <linux/platform_device.h> +#include <linux/mfd/max14577.h> +#include <linux/mfd/max14577-private.h> +#include <linux/extcon.h> + +#define DEV_NAME "max14577-muic" +#define DELAY_MS_DEFAULT 17000 /* unit: millisecond */ + +enum max14577_muic_adc_debounce_time { + ADC_DEBOUNCE_TIME_5MS = 0, + ADC_DEBOUNCE_TIME_10MS, + ADC_DEBOUNCE_TIME_25MS, + ADC_DEBOUNCE_TIME_38_62MS, +}; + +enum max14577_muic_status { + MAX14577_MUIC_STATUS1 = 0, + MAX14577_MUIC_STATUS2 = 1, + MAX14577_MUIC_STATUS_END, +}; + +struct max14577_muic_info { + struct device *dev; + struct max14577 *max14577; + struct extcon_dev *edev; + int prev_cable_type; + int prev_chg_type; + u8 status[MAX14577_MUIC_STATUS_END]; + + bool irq_adc; + bool irq_chg; + struct work_struct irq_work; + struct mutex mutex; + + /* + * Use delayed workqueue to detect cable state and then + * notify cable state to notifiee/platform through uevent. + * After completing the booting of platform, the extcon provider + * driver should notify cable state to upper layer. + */ + struct delayed_work wq_detcable; + + /* + * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB + * h/w path of COMP2/COMN1 on CONTROL1 register. + */ + int path_usb; + int path_uart; +}; + +enum max14577_muic_cable_group { + MAX14577_CABLE_GROUP_ADC = 0, + MAX14577_CABLE_GROUP_CHG, +}; + +/** + * struct max14577_muic_irq + * @irq: the index of irq list of MUIC device. + * @name: the name of irq. + * @virq: the virtual irq to use irq domain + */ +struct max14577_muic_irq { + unsigned int irq; + const char *name; + unsigned int virq; +}; + +static struct max14577_muic_irq muic_irqs[] = { + { MAX14577_IRQ_INT1_ADC, "muic-ADC" }, + { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" }, + { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" }, + { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" }, + { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" }, + { MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" }, + { MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" }, + { MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" }, +}; + +/* Define supported accessory type */ +enum max14577_muic_acc_type { + MAX14577_MUIC_ADC_GROUND = 0x0, + MAX14577_MUIC_ADC_SEND_END_BUTTON, + MAX14577_MUIC_ADC_REMOTE_S1_BUTTON, + MAX14577_MUIC_ADC_REMOTE_S2_BUTTON, + MAX14577_MUIC_ADC_REMOTE_S3_BUTTON, + MAX14577_MUIC_ADC_REMOTE_S4_BUTTON, + MAX14577_MUIC_ADC_REMOTE_S5_BUTTON, + MAX14577_MUIC_ADC_REMOTE_S6_BUTTON, + MAX14577_MUIC_ADC_REMOTE_S7_BUTTON, + MAX14577_MUIC_ADC_REMOTE_S8_BUTTON, + MAX14577_MUIC_ADC_REMOTE_S9_BUTTON, + MAX14577_MUIC_ADC_REMOTE_S10_BUTTON, + MAX14577_MUIC_ADC_REMOTE_S11_BUTTON, + MAX14577_MUIC_ADC_REMOTE_S12_BUTTON, + MAX14577_MUIC_ADC_RESERVED_ACC_1, + MAX14577_MUIC_ADC_RESERVED_ACC_2, + MAX14577_MUIC_ADC_RESERVED_ACC_3, + MAX14577_MUIC_ADC_RESERVED_ACC_4, + MAX14577_MUIC_ADC_RESERVED_ACC_5, + MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2, + MAX14577_MUIC_ADC_PHONE_POWERED_DEV, + MAX14577_MUIC_ADC_TTY_CONVERTER, + MAX14577_MUIC_ADC_UART_CABLE, + MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG, + MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF, + MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON, + MAX14577_MUIC_ADC_AV_CABLE_NOLOAD, + MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG, + MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF, + MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON, + MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */ + MAX14577_MUIC_ADC_OPEN, +}; + +/* max14577 MUIC device support below list of accessories(external connector) */ +enum { + EXTCON_CABLE_USB = 0, + EXTCON_CABLE_TA, + EXTCON_CABLE_FAST_CHARGER, + EXTCON_CABLE_SLOW_CHARGER, + EXTCON_CABLE_CHARGE_DOWNSTREAM, + EXTCON_CABLE_JIG_USB_ON, + EXTCON_CABLE_JIG_USB_OFF, + EXTCON_CABLE_JIG_UART_OFF, + EXTCON_CABLE_JIG_UART_ON, + + _EXTCON_CABLE_NUM, +}; + +static const char *max14577_extcon_cable[] = { + [EXTCON_CABLE_USB] = "USB", + [EXTCON_CABLE_TA] = "TA", + [EXTCON_CABLE_FAST_CHARGER] = "Fast-charger", + [EXTCON_CABLE_SLOW_CHARGER] = "Slow-charger", + [EXTCON_CABLE_CHARGE_DOWNSTREAM] = "Charge-downstream", + [EXTCON_CABLE_JIG_USB_ON] = "JIG-USB-ON", + [EXTCON_CABLE_JIG_USB_OFF] = "JIG-USB-OFF", + [EXTCON_CABLE_JIG_UART_OFF] = "JIG-UART-OFF", + [EXTCON_CABLE_JIG_UART_ON] = "JIG-UART-ON", + + NULL, +}; + +/* + * max14577_muic_set_debounce_time - Set the debounce time of ADC + * @info: the instance including private data of max14577 MUIC + * @time: the debounce time of ADC + */ +static int max14577_muic_set_debounce_time(struct max14577_muic_info *info, + enum max14577_muic_adc_debounce_time time) +{ + u8 ret; + + switch (time) { + case ADC_DEBOUNCE_TIME_5MS: + case ADC_DEBOUNCE_TIME_10MS: + case ADC_DEBOUNCE_TIME_25MS: + case ADC_DEBOUNCE_TIME_38_62MS: + ret = max14577_update_reg(info->max14577->regmap, + MAX14577_MUIC_REG_CONTROL3, + CTRL3_ADCDBSET_MASK, + time << CTRL3_ADCDBSET_SHIFT); + if (ret) { + dev_err(info->dev, "failed to set ADC debounce time\n"); + return ret; + } + break; + default: + dev_err(info->dev, "invalid ADC debounce time\n"); + return -EINVAL; + } + + return 0; +}; + +/* + * max14577_muic_set_path - Set hardware line according to attached cable + * @info: the instance including private data of max14577 MUIC + * @value: the path according to attached cable + * @attached: the state of cable (true:attached, false:detached) + * + * The max14577 MUIC device share outside H/W line among a varity of cables + * so, this function set internal path of H/W line according to the type of + * attached cable. + */ +static int max14577_muic_set_path(struct max14577_muic_info *info, + u8 val, bool attached) +{ + int ret = 0; + u8 ctrl1, ctrl2 = 0; + + /* Set open state to path before changing hw path */ + ret = max14577_update_reg(info->max14577->regmap, + MAX14577_MUIC_REG_CONTROL1, + CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN); + if (ret < 0) { + dev_err(info->dev, "failed to update MUIC register\n"); + return ret; + } + + if (attached) + ctrl1 = val; + else + ctrl1 = CTRL1_SW_OPEN; + + ret = max14577_update_reg(info->max14577->regmap, + MAX14577_MUIC_REG_CONTROL1, + CLEAR_IDBEN_MICEN_MASK, ctrl1); + if (ret < 0) { + dev_err(info->dev, "failed to update MUIC register\n"); + return ret; + } + + if (attached) + ctrl2 |= CTRL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */ + else + ctrl2 |= CTRL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */ + + ret = max14577_update_reg(info->max14577->regmap, + MAX14577_REG_CONTROL2, + CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2); + if (ret < 0) { + dev_err(info->dev, "failed to update MUIC register\n"); + return ret; + } + + dev_dbg(info->dev, + "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n", + ctrl1, ctrl2, attached ? "attached" : "detached"); + + return 0; +} + +/* + * max14577_muic_get_cable_type - Return cable type and check cable state + * @info: the instance including private data of max14577 MUIC + * @group: the path according to attached cable + * @attached: store cable state and return + * + * This function check the cable state either attached or detached, + * and then divide precise type of cable according to cable group. + * - max14577_CABLE_GROUP_ADC + * - max14577_CABLE_GROUP_CHG + */ +static int max14577_muic_get_cable_type(struct max14577_muic_info *info, + enum max14577_muic_cable_group group, bool *attached) +{ + int cable_type = 0; + int adc; + int chg_type; + + switch (group) { + case MAX14577_CABLE_GROUP_ADC: + /* + * Read ADC value to check cable type and decide cable state + * according to cable type + */ + adc = info->status[MAX14577_MUIC_STATUS1] & STATUS1_ADC_MASK; + adc >>= STATUS1_ADC_SHIFT; + + /* + * Check current cable state/cable type and store cable type + * (info->prev_cable_type) for handling cable when cable is + * detached. + */ + if (adc == MAX14577_MUIC_ADC_OPEN) { + *attached = false; + + cable_type = info->prev_cable_type; + info->prev_cable_type = MAX14577_MUIC_ADC_OPEN; + } else { + *attached = true; + + cable_type = info->prev_cable_type = adc; + } + break; + case MAX14577_CABLE_GROUP_CHG: + /* + * Read charger type to check cable type and decide cable state + * according to type of charger cable. + */ + chg_type = info->status[MAX14577_MUIC_STATUS2] & + STATUS2_CHGTYP_MASK; + chg_type >>= STATUS2_CHGTYP_SHIFT; + + if (chg_type == MAX14577_CHARGER_TYPE_NONE) { + *attached = false; + + cable_type = info->prev_chg_type; + info->prev_chg_type = MAX14577_CHARGER_TYPE_NONE; + } else { + *attached = true; + + /* + * Check current cable state/cable type and store cable + * type(info->prev_chg_type) for handling cable when + * charger cable is detached. + */ + cable_type = info->prev_chg_type = chg_type; + } + + break; + default: + dev_err(info->dev, "Unknown cable group (%d)\n", group); + cable_type = -EINVAL; + break; + } + + return cable_type; +} + +static int max14577_muic_jig_handler(struct max14577_muic_info *info, + int cable_type, bool attached) +{ + char cable_name[32]; + int ret = 0; + u8 path = CTRL1_SW_OPEN; + + dev_dbg(info->dev, + "external connector is %s (adc:0x%02x)\n", + attached ? "attached" : "detached", cable_type); + + switch (cable_type) { + case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: /* ADC_JIG_USB_OFF */ + /* PATH:AP_USB */ + strcpy(cable_name, "JIG-USB-OFF"); + path = CTRL1_SW_USB; + break; + case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: /* ADC_JIG_USB_ON */ + /* PATH:AP_USB */ + strcpy(cable_name, "JIG-USB-ON"); + path = CTRL1_SW_USB; + break; + case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: /* ADC_JIG_UART_OFF */ + /* PATH:AP_UART */ + strcpy(cable_name, "JIG-UART-OFF"); + path = CTRL1_SW_UART; + break; + default: + dev_err(info->dev, "failed to detect %s jig cable\n", + attached ? "attached" : "detached"); + return -EINVAL; + } + + ret = max14577_muic_set_path(info, path, attached); + if (ret < 0) + return ret; + + extcon_set_cable_state(info->edev, cable_name, attached); + + return 0; +} + +static int max14577_muic_adc_handler(struct max14577_muic_info *info) +{ + int cable_type; + bool attached; + int ret = 0; + + /* Check accessory state which is either detached or attached */ + cable_type = max14577_muic_get_cable_type(info, + MAX14577_CABLE_GROUP_ADC, &attached); + + dev_dbg(info->dev, + "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n", + attached ? "attached" : "detached", cable_type, + info->prev_cable_type); + + switch (cable_type) { + case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: + case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: + case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: + /* JIG */ + ret = max14577_muic_jig_handler(info, cable_type, attached); + if (ret < 0) + return ret; + break; + case MAX14577_MUIC_ADC_GROUND: + case MAX14577_MUIC_ADC_SEND_END_BUTTON: + case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON: + case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON: + case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON: + case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON: + case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON: + case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON: + case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON: + case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON: + case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON: + case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON: + case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON: + case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON: + case MAX14577_MUIC_ADC_RESERVED_ACC_1: + case MAX14577_MUIC_ADC_RESERVED_ACC_2: + case MAX14577_MUIC_ADC_RESERVED_ACC_3: + case MAX14577_MUIC_ADC_RESERVED_ACC_4: + case MAX14577_MUIC_ADC_RESERVED_ACC_5: + case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2: + case MAX14577_MUIC_ADC_PHONE_POWERED_DEV: + case MAX14577_MUIC_ADC_TTY_CONVERTER: + case MAX14577_MUIC_ADC_UART_CABLE: + case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG: + case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD: + case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG: + case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON: + case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1: + /* + * This accessory isn't used in general case if it is specially + * needed to detect additional accessory, should implement + * proper operation when this accessory is attached/detached. + */ + dev_info(info->dev, + "accessory is %s but it isn't used (adc:0x%x)\n", + attached ? "attached" : "detached", cable_type); + return -EAGAIN; + default: + dev_err(info->dev, + "failed to detect %s accessory (adc:0x%x)\n", + attached ? "attached" : "detached", cable_type); + return -EINVAL; + } + + return 0; +} + +static int max14577_muic_chg_handler(struct max14577_muic_info *info) +{ + int chg_type; + bool attached; + int ret = 0; + + chg_type = max14577_muic_get_cable_type(info, + MAX14577_CABLE_GROUP_CHG, &attached); + + dev_dbg(info->dev, + "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n", + attached ? "attached" : "detached", + chg_type, info->prev_chg_type); + + switch (chg_type) { + case MAX14577_CHARGER_TYPE_USB: + /* PATH:AP_USB */ + ret = max14577_muic_set_path(info, info->path_usb, attached); + if (ret < 0) + return ret; + + extcon_set_cable_state(info->edev, "USB", attached); + break; + case MAX14577_CHARGER_TYPE_DEDICATED_CHG: + extcon_set_cable_state(info->edev, "TA", attached); + break; + case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT: + extcon_set_cable_state(info->edev, + "Charge-downstream", attached); + break; + case MAX14577_CHARGER_TYPE_SPECIAL_500MA: + extcon_set_cable_state(info->edev, "Slow-charger", attached); + break; + case MAX14577_CHARGER_TYPE_SPECIAL_1A: + extcon_set_cable_state(info->edev, "Fast-charger", attached); + break; + case MAX14577_CHARGER_TYPE_NONE: + case MAX14577_CHARGER_TYPE_DEAD_BATTERY: + break; + default: + dev_err(info->dev, + "failed to detect %s accessory (chg_type:0x%x)\n", + attached ? "attached" : "detached", chg_type); + return -EINVAL; + } + + return 0; +} + +static void max14577_muic_irq_work(struct work_struct *work) +{ + struct max14577_muic_info *info = container_of(work, + struct max14577_muic_info, irq_work); + int ret = 0; + + if (!info->edev) + return; + + mutex_lock(&info->mutex); + + ret = max14577_bulk_read(info->max14577->regmap, + MAX14577_MUIC_REG_STATUS1, info->status, 2); + if (ret) { + dev_err(info->dev, "failed to read MUIC register\n"); + mutex_unlock(&info->mutex); + return; + } + + if (info->irq_adc) { + ret = max14577_muic_adc_handler(info); + info->irq_adc = false; + } + if (info->irq_chg) { + ret = max14577_muic_chg_handler(info); + info->irq_chg = false; + } + + if (ret < 0) + dev_err(info->dev, "failed to handle MUIC interrupt\n"); + + mutex_unlock(&info->mutex); + + return; +} + +static irqreturn_t max14577_muic_irq_handler(int irq, void *data) +{ + struct max14577_muic_info *info = data; + int i, irq_type = -1; + + /* + * We may be called multiple times for different nested IRQ-s. + * Including changes in INT1_ADC and INT2_CGHTYP at once. + * However we only need to know whether it was ADC, charger + * or both interrupts so decode IRQ and turn on proper flags. + */ + for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) + if (irq == muic_irqs[i].virq) + irq_type = muic_irqs[i].irq; + + switch (irq_type) { + case MAX14577_IRQ_INT1_ADC: + case MAX14577_IRQ_INT1_ADCLOW: + case MAX14577_IRQ_INT1_ADCERR: + /* Handle all of accessory except for + type of charger accessory */ + info->irq_adc = true; + break; + case MAX14577_IRQ_INT2_CHGTYP: + case MAX14577_IRQ_INT2_CHGDETRUN: + case MAX14577_IRQ_INT2_DCDTMR: + case MAX14577_IRQ_INT2_DBCHG: + case MAX14577_IRQ_INT2_VBVOLT: + /* Handle charger accessory */ + info->irq_chg = true; + break; + default: + dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n", + irq_type); + return IRQ_HANDLED; + } + schedule_work(&info->irq_work); + + return IRQ_HANDLED; +} + +static int max14577_muic_detect_accessory(struct max14577_muic_info *info) +{ + int ret = 0; + int adc; + int chg_type; + bool attached; + + mutex_lock(&info->mutex); + + /* Read STATUSx register to detect accessory */ + ret = max14577_bulk_read(info->max14577->regmap, + MAX14577_MUIC_REG_STATUS1, info->status, 2); + if (ret) { + dev_err(info->dev, "failed to read MUIC register\n"); + mutex_unlock(&info->mutex); + return ret; + } + + adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC, + &attached); + if (attached && adc != MAX14577_MUIC_ADC_OPEN) { + ret = max14577_muic_adc_handler(info); + if (ret < 0) { + dev_err(info->dev, "Cannot detect accessory\n"); + mutex_unlock(&info->mutex); + return ret; + } + } + + chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG, + &attached); + if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) { + ret = max14577_muic_chg_handler(info); + if (ret < 0) { + dev_err(info->dev, "Cannot detect charger accessory\n"); + mutex_unlock(&info->mutex); + return ret; + } + } + + mutex_unlock(&info->mutex); + + return 0; +} + +static void max14577_muic_detect_cable_wq(struct work_struct *work) +{ + struct max14577_muic_info *info = container_of(to_delayed_work(work), + struct max14577_muic_info, wq_detcable); + + max14577_muic_detect_accessory(info); +} + +static int max14577_muic_probe(struct platform_device *pdev) +{ + struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); + struct max14577_muic_info *info; + int delay_jiffies; + int ret; + int i; + u8 id; + + info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); + if (!info) { + dev_err(&pdev->dev, "failed to allocate memory\n"); + return -ENOMEM; + } + info->dev = &pdev->dev; + info->max14577 = max14577; + + platform_set_drvdata(pdev, info); + mutex_init(&info->mutex); + + INIT_WORK(&info->irq_work, max14577_muic_irq_work); + + /* Support irq domain for max14577 MUIC device */ + for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) { + struct max14577_muic_irq *muic_irq = &muic_irqs[i]; + unsigned int virq = 0; + + virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq); + if (!virq) + return -EINVAL; + muic_irq->virq = virq; + + ret = devm_request_threaded_irq(&pdev->dev, virq, NULL, + max14577_muic_irq_handler, + IRQF_NO_SUSPEND, + muic_irq->name, info); + if (ret) { + dev_err(&pdev->dev, + "failed: irq request (IRQ: %d," + " error :%d)\n", + muic_irq->irq, ret); + return ret; + } + } + + /* Initialize extcon device */ + info->edev = devm_kzalloc(&pdev->dev, sizeof(*info->edev), GFP_KERNEL); + if (!info->edev) { + dev_err(&pdev->dev, "failed to allocate memory for extcon\n"); + return -ENOMEM; + } + info->edev->name = DEV_NAME; + info->edev->supported_cable = max14577_extcon_cable; + ret = extcon_dev_register(info->edev); + if (ret) { + dev_err(&pdev->dev, "failed to register extcon device\n"); + return ret; + } + + /* Default h/w line path */ + info->path_usb = CTRL1_SW_USB; + info->path_uart = CTRL1_SW_UART; + delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT); + + /* Set initial path for UART */ + max14577_muic_set_path(info, info->path_uart, true); + + /* Check revision number of MUIC device*/ + ret = max14577_read_reg(info->max14577->regmap, + MAX14577_REG_DEVICEID, &id); + if (ret < 0) { + dev_err(&pdev->dev, "failed to read revision number\n"); + goto err_extcon; + } + dev_info(info->dev, "device ID : 0x%x\n", id); + + /* Set ADC debounce time */ + max14577_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS); + + /* + * Detect accessory after completing the initialization of platform + * + * - Use delayed workqueue to detect cable state and then + * notify cable state to notifiee/platform through uevent. + * After completing the booting of platform, the extcon provider + * driver should notify cable state to upper layer. + */ + INIT_DELAYED_WORK(&info->wq_detcable, max14577_muic_detect_cable_wq); + ret = queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, + delay_jiffies); + if (ret < 0) { + dev_err(&pdev->dev, + "failed to schedule delayed work for cable detect\n"); + goto err_extcon; + } + + return ret; + +err_extcon: + extcon_dev_unregister(info->edev); + return ret; +} + +static int max14577_muic_remove(struct platform_device *pdev) +{ + struct max14577_muic_info *info = platform_get_drvdata(pdev); + + cancel_work_sync(&info->irq_work); + extcon_dev_unregister(info->edev); + + return 0; +} + +static struct platform_driver max14577_muic_driver = { + .driver = { + .name = DEV_NAME, + .owner = THIS_MODULE, + }, + .probe = max14577_muic_probe, + .remove = max14577_muic_remove, +}; + +module_platform_driver(max14577_muic_driver); + +MODULE_DESCRIPTION("MAXIM 14577 Extcon driver"); +MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:extcon-max14577"); |