summaryrefslogtreecommitdiffstats
path: root/drivers/extcon
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/extcon')
-rw-r--r--drivers/extcon/Kconfig8
-rw-r--r--drivers/extcon/Makefile1
-rw-r--r--drivers/extcon/extcon-max8997.c537
3 files changed, 546 insertions, 0 deletions
diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
index 85cecff..29c5cf8 100644
--- a/drivers/extcon/Kconfig
+++ b/drivers/extcon/Kconfig
@@ -21,4 +21,12 @@ config EXTCON_GPIO
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
index 2c46d41..86020bd 100644
--- a/drivers/extcon/Makefile
+++ b/drivers/extcon/Makefile
@@ -4,3 +4,4 @@
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 0000000..2b1aa04
--- /dev/null
+++ b/drivers/extcon/extcon-max8997.c
@@ -0,0 +1,537 @@
+/*
+ * 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);
+
+ for (i = i - 1; i >= 0; i--)
+ free_irq(muic_irq->irq, info);
+
+ 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:
+ 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");
OpenPOWER on IntegriCloud