--- /dev/null
+/*
+ * extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
+ *
+ * Copyright (C) 2012 Samsung Electronics
+ * 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>
+#include <linux/irqdomain.h>
+
+#define DEV_NAME "max8997-muic"
+#define DELAY_MS_DEFAULT 20000 /* unit: millisecond */
+
+enum max8997_muic_adc_debounce_time {
+ ADC_DEBOUNCE_TIME_0_5MS = 0, /* 0.5ms */
+ ADC_DEBOUNCE_TIME_10MS, /* 10ms */
+ ADC_DEBOUNCE_TIME_25MS, /* 25ms */
+ ADC_DEBOUNCE_TIME_38_62MS, /* 38.62ms */
+};
+
+struct max8997_muic_irq {
+ unsigned int irq;
+ const char *name;
+ unsigned int virq;
+};
+
+static struct max8997_muic_irq muic_irqs[] = {
+ { MAX8997_MUICIRQ_ADCError, "muic-ADCERROR" },
+ { MAX8997_MUICIRQ_ADCLow, "muic-ADCLOW" },
+ { MAX8997_MUICIRQ_ADC, "muic-ADC" },
+ { MAX8997_MUICIRQ_VBVolt, "muic-VBVOLT" },
+ { MAX8997_MUICIRQ_DBChg, "muic-DBCHG" },
+ { MAX8997_MUICIRQ_DCDTmr, "muic-DCDTMR" },
+ { MAX8997_MUICIRQ_ChgDetRun, "muic-CHGDETRUN" },
+ { MAX8997_MUICIRQ_ChgTyp, "muic-CHGTYP" },
+ { MAX8997_MUICIRQ_OVP, "muic-OVP" },
+};
+
+/* Define supported cable type */
+enum max8997_muic_acc_type {
+ MAX8997_MUIC_ADC_GROUND = 0x0,
+ MAX8997_MUIC_ADC_MHL, /* MHL*/
+ MAX8997_MUIC_ADC_REMOTE_S1_BUTTON,
+ MAX8997_MUIC_ADC_REMOTE_S2_BUTTON,
+ MAX8997_MUIC_ADC_REMOTE_S3_BUTTON,
+ MAX8997_MUIC_ADC_REMOTE_S4_BUTTON,
+ MAX8997_MUIC_ADC_REMOTE_S5_BUTTON,
+ MAX8997_MUIC_ADC_REMOTE_S6_BUTTON,
+ MAX8997_MUIC_ADC_REMOTE_S7_BUTTON,
+ MAX8997_MUIC_ADC_REMOTE_S8_BUTTON,
+ MAX8997_MUIC_ADC_REMOTE_S9_BUTTON,
+ MAX8997_MUIC_ADC_REMOTE_S10_BUTTON,
+ MAX8997_MUIC_ADC_REMOTE_S11_BUTTON,
+ MAX8997_MUIC_ADC_REMOTE_S12_BUTTON,
+ MAX8997_MUIC_ADC_RESERVED_ACC_1,
+ MAX8997_MUIC_ADC_RESERVED_ACC_2,
+ MAX8997_MUIC_ADC_RESERVED_ACC_3,
+ MAX8997_MUIC_ADC_RESERVED_ACC_4,
+ MAX8997_MUIC_ADC_RESERVED_ACC_5,
+ MAX8997_MUIC_ADC_CEA936_AUDIO,
+ MAX8997_MUIC_ADC_PHONE_POWERED_DEV,
+ MAX8997_MUIC_ADC_TTY_CONVERTER,
+ MAX8997_MUIC_ADC_UART_CABLE,
+ MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG,
+ MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF, /* JIG-USB-OFF */
+ MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON, /* JIG-USB-ON */
+ MAX8997_MUIC_ADC_AV_CABLE_NOLOAD, /* DESKDOCK */
+ MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG,
+ MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF, /* JIG-UART */
+ MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON, /* CARDOCK */
+ MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE,
+ MAX8997_MUIC_ADC_OPEN, /* OPEN */
+};
+
+enum max8997_muic_cable_group {
+ MAX8997_CABLE_GROUP_ADC = 0,
+ MAX8997_CABLE_GROUP_ADC_GND,
+ MAX8997_CABLE_GROUP_CHG,
+ MAX8997_CABLE_GROUP_VBVOLT,
+};
+
+enum max8997_muic_usb_type {
+ MAX8997_USB_HOST,
+ MAX8997_USB_DEVICE,
+};
+
+enum max8997_muic_charger_type {
+ MAX8997_CHARGER_TYPE_NONE = 0,
+ MAX8997_CHARGER_TYPE_USB,
+ MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT,
+ MAX8997_CHARGER_TYPE_DEDICATED_CHG,
+ MAX8997_CHARGER_TYPE_500MA,
+ MAX8997_CHARGER_TYPE_1A,
+ MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7,
+};
+
+struct max8997_muic_info {
+ struct device *dev;
+ struct i2c_client *muic;
+ struct extcon_dev *edev;
+ int prev_cable_type;
+ int prev_chg_type;
+ u8 status[2];
+
+ int irq;
+ struct work_struct irq_work;
+ struct mutex mutex;
+
+ struct max8997_muic_platform_data *muic_pdata;
+ enum max8997_muic_charger_type pre_charger_type;
+
+ /*
+ * 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 {
+ EXTCON_CABLE_USB = 0,
+ EXTCON_CABLE_USB_HOST,
+ EXTCON_CABLE_TA,
+ EXTCON_CABLE_FAST_CHARGER,
+ EXTCON_CABLE_SLOW_CHARGER,
+ EXTCON_CABLE_CHARGE_DOWNSTREAM,
+ EXTCON_CABLE_MHL,
+ EXTCON_CABLE_DOCK_DESK,
+ EXTCON_CABLE_DOCK_CARD,
+ EXTCON_CABLE_JIG,
+
+ _EXTCON_CABLE_NUM,
+};
+
+static const char *max8997_extcon_cable[] = {
+ [EXTCON_CABLE_USB] = "USB",
+ [EXTCON_CABLE_USB_HOST] = "USB-Host",
+ [EXTCON_CABLE_TA] = "TA",
+ [EXTCON_CABLE_FAST_CHARGER] = "Fast-charger",
+ [EXTCON_CABLE_SLOW_CHARGER] = "Slow-charger",
+ [EXTCON_CABLE_CHARGE_DOWNSTREAM] = "Charge-downstream",
+ [EXTCON_CABLE_MHL] = "MHL",
+ [EXTCON_CABLE_DOCK_DESK] = "Dock-Desk",
+ [EXTCON_CABLE_DOCK_CARD] = "Dock-Card",
+ [EXTCON_CABLE_JIG] = "JIG",
+
+ NULL,
+};
+
+/*
+ * max8997_muic_set_debounce_time - Set the debounce time of ADC
+ * @info: the instance including private data of max8997 MUIC
+ * @time: the debounce time of ADC
+ */
+static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
+ enum max8997_muic_adc_debounce_time time)
+{
+ int ret;
+
+ switch (time) {
+ case ADC_DEBOUNCE_TIME_0_5MS:
+ case ADC_DEBOUNCE_TIME_10MS:
+ case ADC_DEBOUNCE_TIME_25MS:
+ case ADC_DEBOUNCE_TIME_38_62MS:
+ ret = max8997_update_reg(info->muic,
+ MAX8997_MUIC_REG_CONTROL3,
+ time << CONTROL3_ADCDBSET_SHIFT,
+ CONTROL3_ADCDBSET_MASK);
+ 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;
+};
+
+/*
+ * max8997_muic_set_path - Set hardware line according to attached cable
+ * @info: the instance including private data of max8997 MUIC
+ * @value: the path according to attached cable
+ * @attached: the state of cable (true:attached, false:detached)
+ *
+ * The max8997 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 max8997_muic_set_path(struct max8997_muic_info *info,
+ u8 val, bool attached)
+{
+ int ret = 0;
+ u8 ctrl1, ctrl2 = 0;
+
+ if (attached)
+ ctrl1 = val;
+ else
+ ctrl1 = CONTROL1_SW_OPEN;
+
+ ret = max8997_update_reg(info->muic,
+ MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
+ if (ret < 0) {
+ dev_err(info->dev, "failed to update MUIC register\n");
+ return ret;
+ }
+
+ if (attached)
+ ctrl2 |= CONTROL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */
+ else
+ ctrl2 |= CONTROL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */
+
+ ret = max8997_update_reg(info->muic,
+ MAX8997_MUIC_REG_CONTROL2, ctrl2,
+ CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
+ if (ret < 0) {
+ dev_err(info->dev, "failed to update MUIC register\n");
+ return ret;
+ }
+
+ dev_info(info->dev,
+ "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
+ ctrl1, ctrl2, attached ? "attached" : "detached");
+
+ return 0;
+}
+
+/*
+ * max8997_muic_get_cable_type - Return cable type and check cable state
+ * @info: the instance including private data of max8997 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.
+ * - MAX8997_CABLE_GROUP_ADC
+ * - MAX8997_CABLE_GROUP_CHG
+ */
+static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
+ enum max8997_muic_cable_group group, bool *attached)
+{
+ int cable_type = 0;
+ int adc;
+ int chg_type;
+
+ switch (group) {
+ case MAX8997_CABLE_GROUP_ADC:
+ /*
+ * Read ADC value to check cable type and decide cable state
+ * according to cable type
+ */
+ adc = info->status[0] & 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 == MAX8997_MUIC_ADC_OPEN) {
+ *attached = false;
+
+ cable_type = info->prev_cable_type;
+ info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
+ } else {
+ *attached = true;
+
+ cable_type = info->prev_cable_type = adc;
+ }
+ break;
+ case MAX8997_CABLE_GROUP_CHG:
+ /*
+ * Read charger type to check cable type and decide cable state
+ * according to type of charger cable.
+ */
+ chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
+ chg_type >>= STATUS2_CHGTYP_SHIFT;
+
+ if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
+ *attached = false;
+
+ cable_type = info->prev_chg_type;
+ info->prev_chg_type = MAX8997_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 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) {
+ ret = max8997_muic_set_path(info, info->path_usb, attached);
+ if (ret < 0) {
+ dev_err(info->dev, "failed to update muic register\n");
+ return ret;
+ }
+ }
+
+ 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:
+ dev_err(info->dev, "failed to detect %s usb cable\n",
+ attached ? "attached" : "detached");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int max8997_muic_handle_dock(struct max8997_muic_info *info,
+ int cable_type, bool attached)
+{
+ int ret = 0;
+
+ ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
+ if (ret) {
+ dev_err(info->dev, "failed to update muic register\n");
+ return ret;
+ }
+
+ switch (cable_type) {
+ case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
+ extcon_set_cable_state(info->edev, "Dock-desk", attached);
+ break;
+ case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
+ extcon_set_cable_state(info->edev, "Dock-card", attached);
+ break;
+ default:
+ dev_err(info->dev, "failed to detect %s dock device\n",
+ attached ? "attached" : "detached");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
+ bool attached)
+{
+ int ret = 0;
+
+ /* switch to UART */
+ ret = max8997_muic_set_path(info, info->path_uart, attached);
+ if (ret) {
+ dev_err(info->dev, "failed to update muic register\n");
+ return ret;
+ }
+
+ extcon_set_cable_state(info->edev, "JIG", attached);
+
+ return 0;
+}
+
+static int max8997_muic_adc_handler(struct max8997_muic_info *info)
+{
+ int cable_type;
+ bool attached;
+ int ret = 0;
+
+ /* Check cable state which is either detached or attached */
+ cable_type = max8997_muic_get_cable_type(info,
+ MAX8997_CABLE_GROUP_ADC, &attached);
+
+ switch (cable_type) {
+ case MAX8997_MUIC_ADC_GROUND:
+ ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
+ if (ret < 0)
+ return ret;
+ break;
+ case MAX8997_MUIC_ADC_MHL:
+ extcon_set_cable_state(info->edev, "MHL", attached);
+ break;
+ case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
+ case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
+ ret = max8997_muic_handle_usb(info,
+ MAX8997_USB_DEVICE, attached);
+ if (ret < 0)
+ return ret;
+ break;
+ case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
+ case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
+ ret = max8997_muic_handle_dock(info, cable_type, attached);
+ if (ret < 0)
+ return ret;
+ break;
+ case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
+ ret = max8997_muic_handle_jig_uart(info, attached);
+ break;
+ case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
+ case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
+ case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
+ case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
+ case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
+ case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
+ case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
+ case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
+ case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
+ case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
+ case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
+ case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
+ case MAX8997_MUIC_ADC_RESERVED_ACC_1:
+ case MAX8997_MUIC_ADC_RESERVED_ACC_2:
+ case MAX8997_MUIC_ADC_RESERVED_ACC_3:
+ case MAX8997_MUIC_ADC_RESERVED_ACC_4:
+ case MAX8997_MUIC_ADC_RESERVED_ACC_5:
+ case MAX8997_MUIC_ADC_CEA936_AUDIO:
+ case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
+ case MAX8997_MUIC_ADC_TTY_CONVERTER:
+ case MAX8997_MUIC_ADC_UART_CABLE:
+ case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
+ case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
+ case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
+ /*
+ * This cable isn't used in general case if it is specially
+ * needed to detect additional cable, should implement
+ * proper operation when this cable is attached/detached.
+ */
+ dev_info(info->dev,
+ "cable is %s but it isn't used (type:0x%x)\n",
+ attached ? "attached" : "detached", cable_type);
+ return -EAGAIN;
+ default:
+ dev_err(info->dev,
+ "failed to detect %s unknown cable (type:0x%x)\n",
+ attached ? "attached" : "detached", cable_type);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int max8997_muic_chg_handler(struct max8997_muic_info *info)
+{
+ int chg_type;
+ bool attached;
+ int adc;
+
+ chg_type = max8997_muic_get_cable_type(info,
+ MAX8997_CABLE_GROUP_CHG, &attached);
+
+ switch (chg_type) {
+ case MAX8997_CHARGER_TYPE_NONE:
+ break;
+ case MAX8997_CHARGER_TYPE_USB:
+ adc = info->status[0] & STATUS1_ADC_MASK;
+ adc >>= STATUS1_ADC_SHIFT;
+
+ if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
+ max8997_muic_handle_usb(info,
+ MAX8997_USB_DEVICE, attached);
+ }
+ break;
+ case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
+ extcon_set_cable_state(info->edev,
+ "Charge-downstream", attached);
+ break;
+ case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
+ extcon_set_cable_state(info->edev, "TA", attached);
+ break;
+ case MAX8997_CHARGER_TYPE_500MA:
+ extcon_set_cable_state(info->edev, "Slow-charger", attached);
+ break;
+ case MAX8997_CHARGER_TYPE_1A:
+ extcon_set_cable_state(info->edev, "Fast-charger", attached);
+ break;
+ default:
+ dev_err(info->dev,
+ "failed to detect %s unknown chg cable (type:0x%x)\n",
+ attached ? "attached" : "detached", chg_type);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void max8997_muic_irq_work(struct work_struct *work)
+{
+ struct max8997_muic_info *info = container_of(work,
+ struct max8997_muic_info, irq_work);
+ int irq_type = 0;
+ int i, ret;
+
+ if (!info->edev)
+ return;
+
+ mutex_lock(&info->mutex);
+
+ for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
+ if (info->irq == muic_irqs[i].virq)
+ irq_type = muic_irqs[i].irq;
+
+ ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
+ 2, info->status);
+ if (ret) {
+ dev_err(info->dev, "failed to read muic register\n");
+ mutex_unlock(&info->mutex);
+ return;
+ }
+
+ switch (irq_type) {
+ case MAX8997_MUICIRQ_ADCError:
+ case MAX8997_MUICIRQ_ADCLow:
+ case MAX8997_MUICIRQ_ADC:
+ /* Handle all of cable except for charger cable */
+ ret = max8997_muic_adc_handler(info);
+ break;
+ case MAX8997_MUICIRQ_VBVolt:
+ case MAX8997_MUICIRQ_DBChg:
+ case MAX8997_MUICIRQ_DCDTmr:
+ case MAX8997_MUICIRQ_ChgDetRun:
+ case MAX8997_MUICIRQ_ChgTyp:
+ /* Handle charger cable */
+ ret = max8997_muic_chg_handler(info);
+ break;
+ case MAX8997_MUICIRQ_OVP:
+ break;
+ default:
+ dev_info(info->dev, "misc interrupt: irq %d occurred\n",
+ irq_type);
+ mutex_unlock(&info->mutex);
+ return;
+ }
+
+ if (ret < 0)
+ dev_err(info->dev, "failed to handle MUIC interrupt\n");
+
+ mutex_unlock(&info->mutex);
+}
+
+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 int max8997_muic_detect_dev(struct max8997_muic_info *info)
+{
+ int ret = 0;
+ int adc;
+ int chg_type;
+ bool attached;
+
+ mutex_lock(&info->mutex);
+
+ /* Read STATUSx register to detect accessory */
+ ret = max8997_bulk_read(info->muic,
+ MAX8997_MUIC_REG_STATUS1, 2, info->status);
+ if (ret) {
+ dev_err(info->dev, "failed to read MUIC register\n");
+ mutex_unlock(&info->mutex);
+ return ret;
+ }
+
+ adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
+ &attached);
+ if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
+ ret = max8997_muic_adc_handler(info);
+ if (ret < 0) {
+ dev_err(info->dev, "Cannot detect ADC cable\n");
+ mutex_unlock(&info->mutex);
+ return ret;
+ }
+ }
+
+ chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
+ &attached);
+ if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
+ ret = max8997_muic_chg_handler(info);
+ if (ret < 0) {
+ dev_err(info->dev, "Cannot detect charger cable\n");
+ mutex_unlock(&info->mutex);
+ return ret;
+ }
+ }
+
+ mutex_unlock(&info->mutex);
+
+ return 0;
+}
+
+static void max8997_muic_detect_cable_wq(struct work_struct *work)
+{
+ struct max8997_muic_info *info = container_of(to_delayed_work(work),
+ struct max8997_muic_info, wq_detcable);
+ int ret;
+
+ ret = max8997_muic_detect_dev(info);
+ if (ret < 0)
+ dev_err(info->dev, "failed to detect cable type\n");
+}
+
+static int 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 delay_jiffies;
+ int ret, i;
+
+ info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
+ GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ 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];
+ unsigned int virq = 0;
+
+ virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
+ if (!virq) {
+ ret = -EINVAL;
+ goto err_irq;
+ }
+ muic_irq->virq = virq;
+
+ ret = request_threaded_irq(virq, NULL,
+ max8997_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);
+ goto err_irq;
+ }
+ }
+
+ /* External connector */
+ info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
+ if (IS_ERR(info->edev)) {
+ dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
+ ret = -ENOMEM;
+ goto err_irq;
+ }
+ info->edev->name = DEV_NAME;
+
+ ret = devm_extcon_dev_register(&pdev->dev, info->edev);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register extcon device\n");
+ goto err_irq;
+ }
+
+ if (pdata && pdata->muic_pdata) {
+ struct max8997_muic_platform_data *muic_pdata
+ = pdata->muic_pdata;
+
+ /* Initialize registers according to platform data */
+ for (i = 0; i < muic_pdata->num_init_data; i++) {
+ max8997_write_reg(info->muic,
+ muic_pdata->init_data[i].addr,
+ muic_pdata->init_data[i].data);
+ }
+
+ /*
+ * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
+ * h/w path of COMP2/COMN1 on CONTROL1 register.
+ */
+ if (muic_pdata->path_uart)
+ info->path_uart = muic_pdata->path_uart;
+ else
+ info->path_uart = CONTROL1_SW_UART;
+
+ if (muic_pdata->path_usb)
+ info->path_usb = muic_pdata->path_usb;
+ else
+ info->path_usb = CONTROL1_SW_USB;
+
+ /*
+ * Default delay time for detecting cable state
+ * after certain time.
+ */
+ if (muic_pdata->detcable_delay_ms)
+ delay_jiffies =
+ msecs_to_jiffies(muic_pdata->detcable_delay_ms);
+ else
+ delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
+ } else {
+ info->path_uart = CONTROL1_SW_UART;
+ info->path_usb = CONTROL1_SW_USB;
+ delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
+ }
+
+ /* Set initial path for UART */
+ max8997_muic_set_path(info, info->path_uart, true);
+
+ /* Set ADC debounce time */
+ max8997_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, max8997_muic_detect_cable_wq);
+ queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
+ delay_jiffies);
+
+ return 0;
+
+err_irq:
+ while (--i >= 0)
+ free_irq(muic_irqs[i].virq, info);
+ return ret;
+}
+
+static int max8997_muic_remove(struct platform_device *pdev)
+{
+ struct max8997_muic_info *info = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
+ free_irq(muic_irqs[i].virq, info);
+ cancel_work_sync(&info->irq_work);
+
+ return 0;
+}
+
+static struct platform_driver max8997_muic_driver = {
+ .driver = {
+ .name = DEV_NAME,
+ },
+ .probe = max8997_muic_probe,
+ .remove = 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");
Code Review / kvmfornfv.git / blobdiff