--- /dev/null
+/*
+ * extcon-rt8973a.c - Richtek RT8973A extcon driver to support USB switches
+ *
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd
+ * Author: 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.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/extcon.h>
+
+#include "extcon-rt8973a.h"
+
+#define DELAY_MS_DEFAULT 20000 /* unit: millisecond */
+
+struct muic_irq {
+ unsigned int irq;
+ const char *name;
+ unsigned int virq;
+};
+
+struct reg_data {
+ u8 reg;
+ u8 mask;
+ u8 val;
+ bool invert;
+};
+
+struct rt8973a_muic_info {
+ struct device *dev;
+ struct extcon_dev *edev;
+
+ struct i2c_client *i2c;
+ struct regmap *regmap;
+
+ struct regmap_irq_chip_data *irq_data;
+ struct muic_irq *muic_irqs;
+ unsigned int num_muic_irqs;
+ int irq;
+ bool irq_attach;
+ bool irq_detach;
+ bool irq_ovp;
+ bool irq_otp;
+ struct work_struct irq_work;
+
+ struct reg_data *reg_data;
+ unsigned int num_reg_data;
+ bool auto_config;
+
+ 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 value of RT8973A register to bring up MUIC device. */
+static struct reg_data rt8973a_reg_data[] = {
+ {
+ .reg = RT8973A_REG_CONTROL1,
+ .mask = RT8973A_REG_CONTROL1_ADC_EN_MASK
+ | RT8973A_REG_CONTROL1_USB_CHD_EN_MASK
+ | RT8973A_REG_CONTROL1_CHGTYP_MASK
+ | RT8973A_REG_CONTROL1_SWITCH_OPEN_MASK
+ | RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK
+ | RT8973A_REG_CONTROL1_INTM_MASK,
+ .val = RT8973A_REG_CONTROL1_ADC_EN_MASK
+ | RT8973A_REG_CONTROL1_USB_CHD_EN_MASK
+ | RT8973A_REG_CONTROL1_CHGTYP_MASK,
+ .invert = false,
+ },
+ { /* sentinel */ }
+};
+
+/* List of detectable cables */
+enum {
+ EXTCON_CABLE_USB = 0,
+ EXTCON_CABLE_USB_HOST,
+ EXTCON_CABLE_TA,
+ EXTCON_CABLE_JIG_OFF_USB,
+ EXTCON_CABLE_JIG_ON_USB,
+ EXTCON_CABLE_JIG_OFF_UART,
+ EXTCON_CABLE_JIG_ON_UART,
+
+ EXTCON_CABLE_END,
+};
+
+static const char *rt8973a_extcon_cable[] = {
+ [EXTCON_CABLE_USB] = "USB",
+ [EXTCON_CABLE_USB_HOST] = "USB-Host",
+ [EXTCON_CABLE_TA] = "TA",
+ [EXTCON_CABLE_JIG_OFF_USB] = "JIG-USB-OFF",
+ [EXTCON_CABLE_JIG_ON_USB] = "JIG-USB-ON",
+ [EXTCON_CABLE_JIG_OFF_UART] = "JIG-UART-OFF",
+ [EXTCON_CABLE_JIG_ON_UART] = "JIG-UART-ON",
+ NULL,
+};
+
+/* Define OVP (Over Voltage Protection), OTP (Over Temperature Protection) */
+enum rt8973a_event_type {
+ RT8973A_EVENT_ATTACH = 1,
+ RT8973A_EVENT_DETACH,
+ RT8973A_EVENT_OVP,
+ RT8973A_EVENT_OTP,
+};
+
+/* Define supported accessory type */
+enum rt8973a_muic_acc_type {
+ RT8973A_MUIC_ADC_OTG = 0x0,
+ RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON,
+ RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON,
+ RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON,
+ RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON,
+ RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON,
+ RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON,
+ RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON,
+ RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON,
+ RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON,
+ RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON,
+ RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON,
+ RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON,
+ RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON,
+ RT8973A_MUIC_ADC_RESERVED_ACC_1,
+ RT8973A_MUIC_ADC_RESERVED_ACC_2,
+ RT8973A_MUIC_ADC_RESERVED_ACC_3,
+ RT8973A_MUIC_ADC_RESERVED_ACC_4,
+ RT8973A_MUIC_ADC_RESERVED_ACC_5,
+ RT8973A_MUIC_ADC_AUDIO_TYPE2,
+ RT8973A_MUIC_ADC_PHONE_POWERED_DEV,
+ RT8973A_MUIC_ADC_UNKNOWN_ACC_1,
+ RT8973A_MUIC_ADC_UNKNOWN_ACC_2,
+ RT8973A_MUIC_ADC_TA,
+ RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB,
+ RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB,
+ RT8973A_MUIC_ADC_UNKNOWN_ACC_3,
+ RT8973A_MUIC_ADC_UNKNOWN_ACC_4,
+ RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART,
+ RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART,
+ RT8973A_MUIC_ADC_UNKNOWN_ACC_5,
+ RT8973A_MUIC_ADC_OPEN = 0x1f,
+
+ /* The below accessories has same ADC value (0x1f).
+ So, Device type1 is used to separate specific accessory. */
+ /* |---------|--ADC| */
+ /* | [7:5]|[4:0]| */
+ RT8973A_MUIC_ADC_USB = 0x3f, /* | 001|11111| */
+};
+
+/* List of supported interrupt for RT8973A */
+static struct muic_irq rt8973a_muic_irqs[] = {
+ { RT8973A_INT1_ATTACH, "muic-attach" },
+ { RT8973A_INT1_DETACH, "muic-detach" },
+ { RT8973A_INT1_CHGDET, "muic-chgdet" },
+ { RT8973A_INT1_DCD_T, "muic-dcd-t" },
+ { RT8973A_INT1_OVP, "muic-ovp" },
+ { RT8973A_INT1_CONNECT, "muic-connect" },
+ { RT8973A_INT1_ADC_CHG, "muic-adc-chg" },
+ { RT8973A_INT1_OTP, "muic-otp" },
+ { RT8973A_INT2_UVLO, "muic-uvlo" },
+ { RT8973A_INT2_POR, "muic-por" },
+ { RT8973A_INT2_OTP_FET, "muic-otp-fet" },
+ { RT8973A_INT2_OVP_FET, "muic-ovp-fet" },
+ { RT8973A_INT2_OCP_LATCH, "muic-ocp-latch" },
+ { RT8973A_INT2_OCP, "muic-ocp" },
+ { RT8973A_INT2_OVP_OCP, "muic-ovp-ocp" },
+};
+
+/* Define interrupt list of RT8973A to register regmap_irq */
+static const struct regmap_irq rt8973a_irqs[] = {
+ /* INT1 interrupts */
+ { .reg_offset = 0, .mask = RT8973A_INT1_ATTACH_MASK, },
+ { .reg_offset = 0, .mask = RT8973A_INT1_DETACH_MASK, },
+ { .reg_offset = 0, .mask = RT8973A_INT1_CHGDET_MASK, },
+ { .reg_offset = 0, .mask = RT8973A_INT1_DCD_T_MASK, },
+ { .reg_offset = 0, .mask = RT8973A_INT1_OVP_MASK, },
+ { .reg_offset = 0, .mask = RT8973A_INT1_CONNECT_MASK, },
+ { .reg_offset = 0, .mask = RT8973A_INT1_ADC_CHG_MASK, },
+ { .reg_offset = 0, .mask = RT8973A_INT1_OTP_MASK, },
+
+ /* INT2 interrupts */
+ { .reg_offset = 1, .mask = RT8973A_INT2_UVLOT_MASK,},
+ { .reg_offset = 1, .mask = RT8973A_INT2_POR_MASK, },
+ { .reg_offset = 1, .mask = RT8973A_INT2_OTP_FET_MASK, },
+ { .reg_offset = 1, .mask = RT8973A_INT2_OVP_FET_MASK, },
+ { .reg_offset = 1, .mask = RT8973A_INT2_OCP_LATCH_MASK, },
+ { .reg_offset = 1, .mask = RT8973A_INT2_OCP_MASK, },
+ { .reg_offset = 1, .mask = RT8973A_INT2_OVP_OCP_MASK, },
+};
+
+static const struct regmap_irq_chip rt8973a_muic_irq_chip = {
+ .name = "rt8973a",
+ .status_base = RT8973A_REG_INT1,
+ .mask_base = RT8973A_REG_INTM1,
+ .mask_invert = false,
+ .num_regs = 2,
+ .irqs = rt8973a_irqs,
+ .num_irqs = ARRAY_SIZE(rt8973a_irqs),
+};
+
+/* Define regmap configuration of RT8973A for I2C communication */
+static bool rt8973a_muic_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case RT8973A_REG_INTM1:
+ case RT8973A_REG_INTM2:
+ return true;
+ default:
+ break;
+ }
+ return false;
+}
+
+static const struct regmap_config rt8973a_muic_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .volatile_reg = rt8973a_muic_volatile_reg,
+ .max_register = RT8973A_REG_END,
+};
+
+/* Change DM_CON/DP_CON/VBUSIN switch according to cable type */
+static int rt8973a_muic_set_path(struct rt8973a_muic_info *info,
+ unsigned int con_sw, bool attached)
+{
+ int ret;
+
+ /*
+ * Don't need to set h/w path according to cable type
+ * if Auto-configuration mode of CONTROL1 register is true.
+ */
+ if (info->auto_config)
+ return 0;
+
+ if (!attached)
+ con_sw = DM_DP_SWITCH_UART;
+
+ switch (con_sw) {
+ case DM_DP_SWITCH_OPEN:
+ case DM_DP_SWITCH_USB:
+ case DM_DP_SWITCH_UART:
+ ret = regmap_update_bits(info->regmap, RT8973A_REG_MANUAL_SW1,
+ RT8973A_REG_MANUAL_SW1_DP_MASK |
+ RT8973A_REG_MANUAL_SW1_DM_MASK,
+ con_sw);
+ if (ret < 0) {
+ dev_err(info->dev,
+ "cannot update DM_CON/DP_CON switch\n");
+ return ret;
+ }
+ break;
+ default:
+ dev_err(info->dev, "Unknown DM_CON/DP_CON switch type (%d)\n",
+ con_sw);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int rt8973a_muic_get_cable_type(struct rt8973a_muic_info *info)
+{
+ unsigned int adc, dev1;
+ int ret, cable_type;
+
+ /* Read ADC value according to external cable or button */
+ ret = regmap_read(info->regmap, RT8973A_REG_ADC, &adc);
+ if (ret) {
+ dev_err(info->dev, "failed to read ADC register\n");
+ return ret;
+ }
+ cable_type = adc & RT8973A_REG_ADC_MASK;
+
+ /* Read Device 1 reigster to identify correct cable type */
+ ret = regmap_read(info->regmap, RT8973A_REG_DEV1, &dev1);
+ if (ret) {
+ dev_err(info->dev, "failed to read DEV1 register\n");
+ return ret;
+ }
+
+ switch (adc) {
+ case RT8973A_MUIC_ADC_OPEN:
+ if (dev1 & RT8973A_REG_DEV1_USB_MASK)
+ cable_type = RT8973A_MUIC_ADC_USB;
+ else if (dev1 & RT8973A_REG_DEV1_DCPORT_MASK)
+ cable_type = RT8973A_MUIC_ADC_TA;
+ else
+ cable_type = RT8973A_MUIC_ADC_OPEN;
+ break;
+ default:
+ break;
+ }
+
+ return cable_type;
+}
+
+static int rt8973a_muic_cable_handler(struct rt8973a_muic_info *info,
+ enum rt8973a_event_type event)
+{
+ static unsigned int prev_cable_type;
+ const char **cable_names = info->edev->supported_cable;
+ unsigned int con_sw = DM_DP_SWITCH_UART;
+ int ret, idx = 0, cable_type;
+ bool attached = false;
+
+ if (!cable_names)
+ return 0;
+
+ switch (event) {
+ case RT8973A_EVENT_ATTACH:
+ cable_type = rt8973a_muic_get_cable_type(info);
+ attached = true;
+ break;
+ case RT8973A_EVENT_DETACH:
+ cable_type = prev_cable_type;
+ attached = false;
+ break;
+ case RT8973A_EVENT_OVP:
+ case RT8973A_EVENT_OTP:
+ dev_warn(info->dev,
+ "happen Over %s issue. Need to disconnect all cables\n",
+ event == RT8973A_EVENT_OVP ? "Voltage" : "Temperature");
+ cable_type = prev_cable_type;
+ attached = false;
+ break;
+ default:
+ dev_err(info->dev,
+ "Cannot handle this event (event:%d)\n", event);
+ return -EINVAL;
+ }
+ prev_cable_type = cable_type;
+
+ switch (cable_type) {
+ case RT8973A_MUIC_ADC_OTG:
+ idx = EXTCON_CABLE_USB_HOST;
+ con_sw = DM_DP_SWITCH_USB;
+ break;
+ case RT8973A_MUIC_ADC_TA:
+ idx = EXTCON_CABLE_TA;
+ con_sw = DM_DP_SWITCH_OPEN;
+ break;
+ case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
+ idx = EXTCON_CABLE_JIG_OFF_USB;
+ con_sw = DM_DP_SWITCH_UART;
+ break;
+ case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_USB:
+ idx = EXTCON_CABLE_JIG_ON_USB;
+ con_sw = DM_DP_SWITCH_UART;
+ break;
+ case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_UART:
+ idx = EXTCON_CABLE_JIG_OFF_UART;
+ con_sw = DM_DP_SWITCH_UART;
+ break;
+ case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_ON_UART:
+ idx = EXTCON_CABLE_JIG_ON_UART;
+ con_sw = DM_DP_SWITCH_UART;
+ break;
+ case RT8973A_MUIC_ADC_USB:
+ idx = EXTCON_CABLE_USB;
+ con_sw = DM_DP_SWITCH_USB;
+ break;
+ case RT8973A_MUIC_ADC_OPEN:
+ return 0;
+ case RT8973A_MUIC_ADC_UNKNOWN_ACC_1:
+ case RT8973A_MUIC_ADC_UNKNOWN_ACC_2:
+ case RT8973A_MUIC_ADC_UNKNOWN_ACC_3:
+ case RT8973A_MUIC_ADC_UNKNOWN_ACC_4:
+ case RT8973A_MUIC_ADC_UNKNOWN_ACC_5:
+ dev_warn(info->dev,
+ "Unknown accessory type (adc:0x%x)\n", cable_type);
+ return 0;
+ case RT8973A_MUIC_ADC_AUDIO_SEND_END_BUTTON:
+ case RT8973A_MUIC_ADC_AUDIO_REMOTE_S1_BUTTON:
+ case RT8973A_MUIC_ADC_AUDIO_REMOTE_S2_BUTTON:
+ case RT8973A_MUIC_ADC_AUDIO_REMOTE_S3_BUTTON:
+ case RT8973A_MUIC_ADC_AUDIO_REMOTE_S4_BUTTON:
+ case RT8973A_MUIC_ADC_AUDIO_REMOTE_S5_BUTTON:
+ case RT8973A_MUIC_ADC_AUDIO_REMOTE_S6_BUTTON:
+ case RT8973A_MUIC_ADC_AUDIO_REMOTE_S7_BUTTON:
+ case RT8973A_MUIC_ADC_AUDIO_REMOTE_S8_BUTTON:
+ case RT8973A_MUIC_ADC_AUDIO_REMOTE_S9_BUTTON:
+ case RT8973A_MUIC_ADC_AUDIO_REMOTE_S10_BUTTON:
+ case RT8973A_MUIC_ADC_AUDIO_REMOTE_S11_BUTTON:
+ case RT8973A_MUIC_ADC_AUDIO_REMOTE_S12_BUTTON:
+ case RT8973A_MUIC_ADC_AUDIO_TYPE2:
+ dev_warn(info->dev,
+ "Audio device/button type (adc:0x%x)\n", cable_type);
+ return 0;
+ case RT8973A_MUIC_ADC_RESERVED_ACC_1:
+ case RT8973A_MUIC_ADC_RESERVED_ACC_2:
+ case RT8973A_MUIC_ADC_RESERVED_ACC_3:
+ case RT8973A_MUIC_ADC_RESERVED_ACC_4:
+ case RT8973A_MUIC_ADC_RESERVED_ACC_5:
+ case RT8973A_MUIC_ADC_PHONE_POWERED_DEV:
+ return 0;
+ default:
+ dev_err(info->dev,
+ "Cannot handle this cable_type (adc:0x%x)\n",
+ cable_type);
+ return -EINVAL;
+ }
+
+ /* Change internal hardware path(DM_CON/DP_CON) */
+ ret = rt8973a_muic_set_path(info, con_sw, attached);
+ if (ret < 0)
+ return ret;
+
+ /* Change the state of external accessory */
+ extcon_set_cable_state(info->edev, cable_names[idx], attached);
+
+ return 0;
+}
+
+static void rt8973a_muic_irq_work(struct work_struct *work)
+{
+ struct rt8973a_muic_info *info = container_of(work,
+ struct rt8973a_muic_info, irq_work);
+ int ret = 0;
+
+ if (!info->edev)
+ return;
+
+ mutex_lock(&info->mutex);
+
+ /* Detect attached or detached cables */
+ if (info->irq_attach) {
+ ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
+ info->irq_attach = false;
+ }
+
+ if (info->irq_detach) {
+ ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_DETACH);
+ info->irq_detach = false;
+ }
+
+ if (info->irq_ovp) {
+ ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OVP);
+ info->irq_ovp = false;
+ }
+
+ if (info->irq_otp) {
+ ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_OTP);
+ info->irq_otp = false;
+ }
+
+ if (ret < 0)
+ dev_err(info->dev, "failed to handle MUIC interrupt\n");
+
+ mutex_unlock(&info->mutex);
+}
+
+static irqreturn_t rt8973a_muic_irq_handler(int irq, void *data)
+{
+ struct rt8973a_muic_info *info = data;
+ int i, irq_type = -1;
+
+ for (i = 0; i < info->num_muic_irqs; i++)
+ if (irq == info->muic_irqs[i].virq)
+ irq_type = info->muic_irqs[i].irq;
+
+ switch (irq_type) {
+ case RT8973A_INT1_ATTACH:
+ info->irq_attach = true;
+ break;
+ case RT8973A_INT1_DETACH:
+ info->irq_detach = true;
+ break;
+ case RT8973A_INT1_OVP:
+ info->irq_ovp = true;
+ break;
+ case RT8973A_INT1_OTP:
+ info->irq_otp = true;
+ break;
+ case RT8973A_INT1_CHGDET:
+ case RT8973A_INT1_DCD_T:
+ case RT8973A_INT1_CONNECT:
+ case RT8973A_INT1_ADC_CHG:
+ case RT8973A_INT2_UVLO:
+ case RT8973A_INT2_POR:
+ case RT8973A_INT2_OTP_FET:
+ case RT8973A_INT2_OVP_FET:
+ case RT8973A_INT2_OCP_LATCH:
+ case RT8973A_INT2_OCP:
+ case RT8973A_INT2_OVP_OCP:
+ default:
+ dev_dbg(info->dev,
+ "Cannot handle this interrupt (%d)\n", irq_type);
+ break;
+ }
+
+ schedule_work(&info->irq_work);
+
+ return IRQ_HANDLED;
+}
+
+static void rt8973a_muic_detect_cable_wq(struct work_struct *work)
+{
+ struct rt8973a_muic_info *info = container_of(to_delayed_work(work),
+ struct rt8973a_muic_info, wq_detcable);
+ int ret;
+
+ /* Notify the state of connector cable or not */
+ ret = rt8973a_muic_cable_handler(info, RT8973A_EVENT_ATTACH);
+ if (ret < 0)
+ dev_warn(info->dev, "failed to detect cable state\n");
+}
+
+static void rt8973a_init_dev_type(struct rt8973a_muic_info *info)
+{
+ unsigned int data, vendor_id, version_id;
+ int i, ret;
+
+ /* To test I2C, Print version_id and vendor_id of RT8973A */
+ ret = regmap_read(info->regmap, RT8973A_REG_DEVICE_ID, &data);
+ if (ret) {
+ dev_err(info->dev,
+ "failed to read DEVICE_ID register: %d\n", ret);
+ return;
+ }
+
+ vendor_id = ((data & RT8973A_REG_DEVICE_ID_VENDOR_MASK) >>
+ RT8973A_REG_DEVICE_ID_VENDOR_SHIFT);
+ version_id = ((data & RT8973A_REG_DEVICE_ID_VERSION_MASK) >>
+ RT8973A_REG_DEVICE_ID_VERSION_SHIFT);
+
+ dev_info(info->dev, "Device type: version: 0x%x, vendor: 0x%x\n",
+ version_id, vendor_id);
+
+ /* Initiazle the register of RT8973A device to bring-up */
+ for (i = 0; i < info->num_reg_data; i++) {
+ u8 reg = info->reg_data[i].reg;
+ u8 mask = info->reg_data[i].mask;
+ u8 val = 0;
+
+ if (info->reg_data[i].invert)
+ val = ~info->reg_data[i].val;
+ else
+ val = info->reg_data[i].val;
+
+ regmap_update_bits(info->regmap, reg, mask, val);
+ }
+
+ /* Check whether RT8973A is auto swithcing mode or not */
+ ret = regmap_read(info->regmap, RT8973A_REG_CONTROL1, &data);
+ if (ret) {
+ dev_err(info->dev,
+ "failed to read CONTROL1 register: %d\n", ret);
+ return;
+ }
+
+ data &= RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK;
+ if (data) {
+ info->auto_config = true;
+ dev_info(info->dev,
+ "Enable Auto-configuration for internal path\n");
+ }
+}
+
+static int rt8973a_muic_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct device_node *np = i2c->dev.of_node;
+ struct rt8973a_muic_info *info;
+ int i, ret, irq_flags;
+
+ if (!np)
+ return -EINVAL;
+
+ info = devm_kzalloc(&i2c->dev, sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+ i2c_set_clientdata(i2c, info);
+
+ info->dev = &i2c->dev;
+ info->i2c = i2c;
+ info->irq = i2c->irq;
+ info->muic_irqs = rt8973a_muic_irqs;
+ info->num_muic_irqs = ARRAY_SIZE(rt8973a_muic_irqs);
+ info->reg_data = rt8973a_reg_data;
+ info->num_reg_data = ARRAY_SIZE(rt8973a_reg_data);
+
+ mutex_init(&info->mutex);
+
+ INIT_WORK(&info->irq_work, rt8973a_muic_irq_work);
+
+ info->regmap = devm_regmap_init_i2c(i2c, &rt8973a_muic_regmap_config);
+ if (IS_ERR(info->regmap)) {
+ ret = PTR_ERR(info->regmap);
+ dev_err(info->dev, "failed to allocate register map: %d\n",
+ ret);
+ return ret;
+ }
+
+ /* Support irq domain for RT8973A MUIC device */
+ irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
+ ret = regmap_add_irq_chip(info->regmap, info->irq, irq_flags, 0,
+ &rt8973a_muic_irq_chip, &info->irq_data);
+ if (ret != 0) {
+ dev_err(info->dev, "failed to add irq_chip (irq:%d, err:%d)\n",
+ info->irq, ret);
+ return ret;
+ }
+
+ for (i = 0; i < info->num_muic_irqs; i++) {
+ struct muic_irq *muic_irq = &info->muic_irqs[i];
+ unsigned int virq = 0;
+
+ virq = regmap_irq_get_virq(info->irq_data, muic_irq->irq);
+ if (virq <= 0)
+ return -EINVAL;
+ muic_irq->virq = virq;
+
+ ret = devm_request_threaded_irq(info->dev, virq, NULL,
+ rt8973a_muic_irq_handler,
+ IRQF_NO_SUSPEND,
+ muic_irq->name, info);
+ if (ret) {
+ dev_err(info->dev,
+ "failed: irq request (IRQ: %d, error :%d)\n",
+ muic_irq->irq, ret);
+ return ret;
+ }
+ }
+
+ /* Allocate extcon device */
+ info->edev = devm_extcon_dev_allocate(info->dev, rt8973a_extcon_cable);
+ if (IS_ERR(info->edev)) {
+ dev_err(info->dev, "failed to allocate memory for extcon\n");
+ return -ENOMEM;
+ }
+ info->edev->name = np->name;
+
+ /* Register extcon device */
+ ret = devm_extcon_dev_register(info->dev, info->edev);
+ if (ret) {
+ dev_err(info->dev, "failed to register extcon device\n");
+ return ret;
+ }
+
+ /*
+ * 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, rt8973a_muic_detect_cable_wq);
+ queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
+ msecs_to_jiffies(DELAY_MS_DEFAULT));
+
+ /* Initialize RT8973A device and print vendor id and version id */
+ rt8973a_init_dev_type(info);
+
+ return 0;
+}
+
+static int rt8973a_muic_i2c_remove(struct i2c_client *i2c)
+{
+ struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
+
+ regmap_del_irq_chip(info->irq, info->irq_data);
+
+ return 0;
+}
+
+static const struct of_device_id rt8973a_dt_match[] = {
+ { .compatible = "richtek,rt8973a-muic" },
+ { },
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int rt8973a_muic_suspend(struct device *dev)
+{
+ struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
+ struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
+
+ enable_irq_wake(info->irq);
+
+ return 0;
+}
+
+static int rt8973a_muic_resume(struct device *dev)
+{
+ struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
+ struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
+
+ disable_irq_wake(info->irq);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(rt8973a_muic_pm_ops,
+ rt8973a_muic_suspend, rt8973a_muic_resume);
+
+static const struct i2c_device_id rt8973a_i2c_id[] = {
+ { "rt8973a", TYPE_RT8973A },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, rt8973a_i2c_id);
+
+static struct i2c_driver rt8973a_muic_i2c_driver = {
+ .driver = {
+ .name = "rt8973a",
+ .owner = THIS_MODULE,
+ .pm = &rt8973a_muic_pm_ops,
+ .of_match_table = rt8973a_dt_match,
+ },
+ .probe = rt8973a_muic_i2c_probe,
+ .remove = rt8973a_muic_i2c_remove,
+ .id_table = rt8973a_i2c_id,
+};
+
+static int __init rt8973a_muic_i2c_init(void)
+{
+ return i2c_add_driver(&rt8973a_muic_i2c_driver);
+}
+subsys_initcall(rt8973a_muic_i2c_init);
+
+MODULE_DESCRIPTION("Richtek RT8973A Extcon driver");
+MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff