--- /dev/null
+/*
+ * 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");
projects / platform / adaptation / renesas_rcar / renesas_kernel.git / commitdiff