[PATCH v2 2/2] extcon-axp288: Add axp288 extcon driver support
From: Ramakrishna Pallala
Date: Thu Apr 02 2015 - 07:11:34 EST
This patch adds the extcon support for AXP288 PMIC which
has the BC1.2 charger detection capability. Additionally
it also adds the USB mux switching support b/w SOC and PMIC
based on GPIO control.
Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@xxxxxxxxx>
---
drivers/extcon/Kconfig | 7 +
drivers/extcon/Makefile | 1 +
drivers/extcon/extcon-axp288.c | 479 ++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/axp20x.h | 5 +
4 files changed, 492 insertions(+)
create mode 100644 drivers/extcon/extcon-axp288.c
diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
index 6a1f7de..b8627f7 100644
--- a/drivers/extcon/Kconfig
+++ b/drivers/extcon/Kconfig
@@ -93,4 +93,11 @@ config EXTCON_SM5502
Silicon Mitus SM5502. The SM5502 is a USB port accessory
detector and switch.
+config EXTCON_AXP288
+ tristate "AXP288 EXTCON support"
+ depends on MFD_AXP20X && USB_PHY
+ help
+ Say Y here to enable support for USB peripheral detection
+ and USB MUX switching by AXP288 PMIC.
+
endif # MULTISTATE_SWITCH
diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
index 0370b42..832ad79 100644
--- a/drivers/extcon/Makefile
+++ b/drivers/extcon/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_EXTCON_MAX8997) += extcon-max8997.o
obj-$(CONFIG_EXTCON_PALMAS) += extcon-palmas.o
obj-$(CONFIG_EXTCON_RT8973A) += extcon-rt8973a.o
obj-$(CONFIG_EXTCON_SM5502) += extcon-sm5502.o
+obj-$(CONFIG_EXTCON_AXP288) += extcon-axp288.o
diff --git a/drivers/extcon/extcon-axp288.c b/drivers/extcon/extcon-axp288.c
new file mode 100644
index 0000000..2e75d45
--- /dev/null
+++ b/drivers/extcon/extcon-axp288.c
@@ -0,0 +1,479 @@
+/*
+ * extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection driver
+ *
+ * Copyright (C) 2015 Intel Corporation
+ * Ramakrishna Pallala <ramakrishna.pallala@xxxxxxxxx>
+ *
+ * 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/module.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/usb/phy.h>
+#include <linux/notifier.h>
+#include <linux/extcon.h>
+#include <linux/regmap.h>
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mfd/axp20x.h>
+
+#define AXP288_PS_STAT_REG 0x00
+#define PS_STAT_VBUS_TRIGGER (1 << 0)
+#define PS_STAT_BAT_CHRG_DIR (1 << 2)
+#define PS_STAT_VBUS_ABOVE_VHOLD (1 << 3)
+#define PS_STAT_VBUS_VALID (1 << 4)
+#define PS_STAT_VBUS_PRESENT (1 << 5)
+
+#define AXP288_BC_GLOBAL_REG 0x2c
+#define BC_GLOBAL_RUN (1 << 0)
+#define BC_GLOBAL_DET_STAT (1 << 2)
+#define BC_GLOBAL_DBP_TOUT (1 << 3)
+#define BC_GLOBAL_VLGC_COM_SEL (1 << 4)
+#define BC_GLOBAL_DCD_TOUT_MASK 0x60
+#define BC_GLOBAL_DCD_TOUT_300MS 0x0
+#define BC_GLOBAL_DCD_TOUT_100MS 0x1
+#define BC_GLOBAL_DCD_TOUT_500MS 0x2
+#define BC_GLOBAL_DCD_TOUT_900MS 0x3
+#define BC_GLOBAL_DCD_DET_SEL (1 << 7)
+
+#define AXP288_BC_VBUS_CNTL_REG 0x2d
+#define VBUS_CNTL_DPDM_PD_EN (1 << 4)
+#define VBUS_CNTL_DPDM_FD_EN (1 << 5)
+#define VBUS_CNTL_FIRST_PO_STAT (1 << 6)
+
+#define AXP288_BC_USB_STAT_REG 0x2e
+#define USB_STAT_BUS_STAT_MASK 0x0f
+#define USB_STAT_BUS_STAT_OFFSET 0
+#define USB_STAT_BUS_STAT_ATHD 0x0
+#define USB_STAT_BUS_STAT_CONN 0x1
+#define USB_STAT_BUS_STAT_SUSP 0x2
+#define USB_STAT_BUS_STAT_CONF 0x3
+#define USB_STAT_USB_SS_MODE (1 << 4)
+#define USB_STAT_DEAD_BAT_DET (1 << 6)
+#define USB_STAT_DBP_UNCFG (1 << 7)
+
+#define AXP288_BC_DET_STAT_REG 0x2f
+#define DET_STAT_MASK 0xe0
+#define DET_STAT_OFFSET 5
+#define DET_STAT_SDP 0x1
+#define DET_STAT_CDP 0x2
+#define DET_STAT_DCP 0x3
+
+#define AXP288_PS_BOOT_REASON_REG 0x2
+
+#define AXP288_PWRSRC_IRQ_CFG_REG 0x40
+#define PWRSRC_IRQ_CFG_MASK 0x1c
+
+#define AXP288_BC12_IRQ_CFG_REG 0x45
+#define BC12_IRQ_CFG_MASK 0x2
+
+#define AXP288_PWRSRC_INTR_NUM 4
+
+#define AXP288_DRV_NAME "axp288_extcon"
+
+#define AXP288_EXTCON_CABLE_SDP "Slow-charger"
+#define AXP288_EXTCON_CABLE_CDP "Charge-downstream"
+#define AXP288_EXTCON_CABLE_DCP "Fast-charger"
+
+#define EXTCON_GPIO_MUX_SEL_PMIC 0
+#define EXTCON_GPIO_MUX_SEL_SOC 1
+
+enum {
+ VBUS_FALLING_IRQ = 0,
+ VBUS_RISING_IRQ,
+ MV_CHNG_IRQ,
+ BC_USB_CHNG_IRQ,
+};
+
+static const char *axp288_extcon_cables[] = {
+ AXP288_EXTCON_CABLE_SDP,
+ AXP288_EXTCON_CABLE_CDP,
+ AXP288_EXTCON_CABLE_DCP,
+ NULL,
+};
+
+struct axp288_extcon_info {
+ struct platform_device *pdev;
+ struct regmap *regmap;
+ struct regmap_irq_chip_data *regmap_irqc;
+ struct axp288_extcon_pdata *pdata;
+ int irq[AXP288_PWRSRC_INTR_NUM];
+ struct extcon_dev *edev;
+ struct usb_phy *otg;
+ struct notifier_block extcon_nb;
+ struct extcon_specific_cable_nb cable;
+ bool is_sdp;
+ bool usb_id_short;
+};
+
+static char *pwr_up_down_info[] = {
+ /* bit 0 */ "Last wake caused by user pressing the power button",
+ /* bit 2 */ "Last wake caused by a charger insertion",
+ /* bit 1 */ "Last wake caused by a battery insertion",
+ /* bit 3 */ "Last wake caused by SOC initiated global reset",
+ /* bit 4 */ "Last wake caused by cold reset",
+ /* bit 5 */ "Last shutdown caused by PMIC UVLO threshold",
+ /* bit 6 */ "Last shutdown caused by SOC initiated cold off",
+ /* bit 7 */ "Last shutdown caused by user pressing the power button",
+ NULL,
+};
+
+/*
+ * Decode and log the given "reset source indicator"
+ * register and then clear it.
+ */
+static void axp288_extcon_log_rsi(struct axp288_extcon_info *info,
+ char **pwrsrc_rsi_info, int reg)
+{
+ char **rsi;
+ unsigned int val, i, clear_mask = 0;
+ int ret;
+
+ ret = regmap_read(info->regmap, reg, &val);
+ for (i = 0, rsi = pwrsrc_rsi_info; *rsi; rsi++, i++) {
+ if (val & BIT(i)) {
+ dev_dbg(&info->pdev->dev, "%s\n", *rsi);
+ clear_mask |= BIT(i);
+ }
+ }
+
+ /* Clear the register value for next reboot (write 1 to clear bit) */
+ regmap_write(info->regmap, reg, clear_mask);
+}
+
+static int handle_chrg_det_event(struct axp288_extcon_info *info)
+{
+ static bool notify_otg, notify_charger;
+ static char *cable;
+ int ret, stat, cfg, pwr_stat;
+ u8 chrg_type;
+ bool vbus_attach = false;
+
+ ret = regmap_read(info->regmap, AXP288_PS_STAT_REG, &pwr_stat);
+ if (ret < 0) {
+ dev_err(&info->pdev->dev, "vbus status read error\n");
+ return ret;
+ }
+
+ vbus_attach = (pwr_stat & PS_STAT_VBUS_PRESENT) && !info->usb_id_short;
+ if (vbus_attach) {
+ dev_dbg(&info->pdev->dev, "vbus present\n");
+ } else {
+ dev_dbg(&info->pdev->dev, "vbus not present\n");
+ goto notify_otg;
+ }
+
+ /* Check charger detection completion status */
+ ret = regmap_read(info->regmap, AXP288_BC_GLOBAL_REG, &cfg);
+ if (ret < 0)
+ goto dev_det_ret;
+ if (cfg & BC_GLOBAL_DET_STAT) {
+ dev_dbg(&info->pdev->dev, "charger detection not complete!!\n");
+ goto dev_det_ret;
+ }
+
+ ret = regmap_read(info->regmap, AXP288_BC_DET_STAT_REG, &stat);
+ if (ret < 0)
+ goto dev_det_ret;
+ dev_dbg(&info->pdev->dev, "stat:%x, cfg:%x\n", stat, cfg);
+
+ chrg_type = (stat & DET_STAT_MASK) >> DET_STAT_OFFSET;
+ info->is_sdp = false;
+
+ if (chrg_type == DET_STAT_SDP) {
+ dev_dbg(&info->pdev->dev, "sdp cable connecetd\n");
+ notify_otg = true;
+ notify_charger = true;
+ info->is_sdp = true;
+ cable = AXP288_EXTCON_CABLE_SDP;
+ } else if (chrg_type == DET_STAT_CDP) {
+ dev_dbg(&info->pdev->dev, "cdp cable connecetd\n");
+ notify_otg = true;
+ notify_charger = true;
+ cable = AXP288_EXTCON_CABLE_CDP;
+ } else if (chrg_type == DET_STAT_DCP) {
+ dev_dbg(&info->pdev->dev, "dcp cable connecetd\n");
+ notify_charger = true;
+ cable = AXP288_EXTCON_CABLE_DCP;
+ } else {
+ dev_warn(&info->pdev->dev,
+ "disconnect or unknown or ID event\n");
+ }
+
+notify_otg:
+ if (notify_otg) {
+ /*
+ * If VBUS is absent Connect D+/D- lines to PMIC for BC
+ * detection. Else connect them to SOC for USB communication.
+ */
+ if (info->pdata->gpio_mux_cntl != NULL)
+ gpiod_set_value(info->pdata->gpio_mux_cntl,
+ vbus_attach ? EXTCON_GPIO_MUX_SEL_SOC
+ : EXTCON_GPIO_MUX_SEL_PMIC);
+
+ atomic_notifier_call_chain(&info->otg->notifier,
+ vbus_attach ? USB_EVENT_VBUS : USB_EVENT_NONE, NULL);
+ }
+
+ if (notify_charger)
+ extcon_set_cable_state(info->edev, cable, vbus_attach);
+
+ /* Clear the flags on disconnect event */
+ if (!vbus_attach) {
+ notify_otg = false;
+ notify_charger = false;
+ }
+
+ return 0;
+
+dev_det_ret:
+ if (ret < 0)
+ dev_warn(&info->pdev->dev, "BC Mod detection error\n");
+
+ return ret;
+}
+
+static irqreturn_t axp288_extcon_isr(int irq, void *data)
+{
+ struct axp288_extcon_info *info = data;
+ unsigned int i;
+ int ret;
+
+ for (i = 0; i < AXP288_PWRSRC_INTR_NUM; i++) {
+ if (info->irq[i] == irq)
+ break;
+ }
+
+ if (i == AXP288_PWRSRC_INTR_NUM) {
+ dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
+ return IRQ_NONE;
+ }
+
+ ret = handle_chrg_det_event(info);
+ if (ret < 0)
+ dev_warn(&info->pdev->dev, "error in PWRSRC INT handling\n");
+
+ return IRQ_HANDLED;
+}
+
+static int axp288_extcon_registration(struct axp288_extcon_info *info)
+{
+ int ret;
+
+ /* Register with extcon */
+ info->edev = devm_kzalloc(&info->pdev->dev,
+ sizeof(struct extcon_dev), GFP_KERNEL);
+ if (!info->edev)
+ return -ENOMEM;
+
+ info->edev->name = "extcon-axp288";
+ info->edev->supported_cable = axp288_extcon_cables;
+ ret = extcon_dev_register(info->edev);
+ if (ret)
+ dev_err(&info->pdev->dev, "extcon registration failed!!\n");
+
+ return ret;
+}
+
+static inline bool is_usb_host_mode(struct extcon_dev *evdev)
+{
+ return !!evdev->state;
+}
+
+static int axp288_handle_extcon_event(struct notifier_block *nb,
+ unsigned long event, void *param)
+{
+ struct axp288_extcon_info *info =
+ container_of(nb, struct axp288_extcon_info, extcon_nb);
+ struct extcon_dev *edev = param;
+ int usb_host = is_usb_host_mode(edev);
+
+ dev_info(&info->pdev->dev,
+ "[extcon notification] evt:USB-Host val:%s\n",
+ usb_host ? "Connected" : "Disconnected");
+
+ /*
+ * Set usb_id_short flag to avoid running charger detection logic
+ * in case usb host.
+ */
+ info->usb_id_short = usb_host;
+
+ /*
+ * Connect the USB mux to SOC in case of usb host else connect
+ * it to PMIC.
+ */
+ if (info->pdata->gpio_mux_cntl != NULL) {
+ dev_dbg(&info->pdev->dev,
+ "usb_id_short=%d\n", info->usb_id_short);
+ if (info->usb_id_short)
+ gpiod_set_value(info->pdata->gpio_mux_cntl,
+ EXTCON_GPIO_MUX_SEL_SOC);
+ else
+ gpiod_set_value(info->pdata->gpio_mux_cntl,
+ EXTCON_GPIO_MUX_SEL_PMIC);
+ }
+
+ return NOTIFY_OK;
+}
+
+static int axp288_init_gpio_mux_cntl(struct axp288_extcon_info *info)
+{
+ int ret;
+
+ ret = gpio_request(desc_to_gpio(info->pdata->gpio_mux_cntl), "USB_MUX");
+ if (ret < 0) {
+ dev_err(&info->pdev->dev,
+ "usb mux gpio request failed:gpio=%d\n",
+ desc_to_gpio(info->pdata->gpio_mux_cntl));
+ return ret;
+ }
+ gpiod_direction_output(info->pdata->gpio_mux_cntl,
+ EXTCON_GPIO_MUX_SEL_PMIC);
+
+ info->extcon_nb.notifier_call = axp288_handle_extcon_event;
+ ret = extcon_register_interest(&info->cable, NULL,
+ "USB-Host", &info->extcon_nb);
+ if (ret) {
+ dev_err(&info->pdev->dev, "failed to register extcon notifier\n");
+ return ret;
+ }
+
+ if (info->cable.edev)
+ info->usb_id_short =
+ is_usb_host_mode(info->cable.edev);
+ if (info->usb_id_short)
+ gpiod_set_value(info->pdata->gpio_mux_cntl,
+ EXTCON_GPIO_MUX_SEL_SOC);
+
+ return 0;
+}
+
+static int axp288_extcon_probe(struct platform_device *pdev)
+{
+ struct axp288_extcon_info *info;
+ struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
+ int ret, i, pirq;
+
+ info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->pdev = pdev;
+ info->regmap = axp20x->regmap;
+ info->regmap_irqc = axp20x->regmap_irqc;
+ info->pdata = pdev->dev.platform_data;
+
+ if (!info->pdata) {
+ /* TODO: Try ACPI provided pdata via device properties */
+ if (!device_property_present(&pdev->dev,
+ "axp288_extcon_data\n"))
+ dev_err(&pdev->dev, "no platform data\n");
+ return -ENODEV;
+ }
+ platform_set_drvdata(pdev, info);
+
+ axp288_extcon_log_rsi(info, pwr_up_down_info,
+ AXP288_PS_BOOT_REASON_REG);
+
+ /* Register extcon device */
+ ret = axp288_extcon_registration(info);
+ if (ret < 0)
+ goto extcon_reg_failed;
+
+ /* Get otg transceiver phy */
+ info->otg = usb_get_phy(USB_PHY_TYPE_USB2);
+ if (IS_ERR(info->otg)) {
+ dev_warn(&info->pdev->dev, "Failed to get otg transceiver!!\n");
+ ret = PTR_ERR(info->otg);
+ goto otg_reg_failed;
+ }
+
+ for (i = 0; i < AXP288_PWRSRC_INTR_NUM; i++) {
+ pirq = platform_get_irq(pdev, i);
+ info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
+ if (info->irq[i] < 0) {
+ dev_warn(&info->pdev->dev,
+ "regmap_irq get virq failed for IRQ %d: %d\n",
+ pirq, info->irq[i]);
+ info->irq[i] = -1;
+ goto intr_reg_failed;
+ }
+ ret = request_threaded_irq(info->irq[i],
+ NULL, axp288_extcon_isr,
+ IRQF_ONESHOT, AXP288_DRV_NAME, info);
+ if (ret) {
+ dev_err(&pdev->dev, "request_irq fail :%d err:%d\n",
+ info->irq[i], ret);
+ goto intr_reg_failed;
+ }
+ }
+
+ /* Set up gpio control for USB Mux */
+ if (info->pdata->gpio_mux_cntl != NULL) {
+ ret = axp288_init_gpio_mux_cntl(info);
+ if (ret < 0)
+ goto intr_reg_failed;
+ }
+
+ /* Unmask VBUS interrupt */
+ regmap_write(info->regmap, AXP288_PWRSRC_IRQ_CFG_REG,
+ PWRSRC_IRQ_CFG_MASK);
+ regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
+ BC_GLOBAL_RUN, 0);
+ /* Unmask the BC1.2 complte interrupts */
+ regmap_write(info->regmap, AXP288_BC12_IRQ_CFG_REG, BC12_IRQ_CFG_MASK);
+ /* Enable the charger detection logic */
+ regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
+ BC_GLOBAL_RUN, BC_GLOBAL_RUN);
+
+ return 0;
+
+intr_reg_failed:
+ for (; i > 0; i--) {
+ free_irq(info->irq[i - 1], info);
+ info->irq[i - 1] = -1;
+ }
+ usb_put_phy(info->otg);
+otg_reg_failed:
+ extcon_dev_unregister(info->edev);
+extcon_reg_failed:
+ return ret;
+}
+
+static int axp288_extcon_remove(struct platform_device *pdev)
+{
+ struct axp288_extcon_info *info = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < AXP288_PWRSRC_INTR_NUM; i++)
+ free_irq(info->irq[i], info);
+ usb_put_phy(info->otg);
+ extcon_dev_unregister(info->edev);
+ return 0;
+}
+
+static struct platform_driver axp288_extcon_driver = {
+ .probe = axp288_extcon_probe,
+ .remove = axp288_extcon_remove,
+ .driver = {
+ .name = AXP288_DRV_NAME,
+ },
+};
+module_platform_driver(axp288_extcon_driver);
+
+MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@xxxxxxxxx>");
+MODULE_DESCRIPTION("X-Powers AXP288 extcon driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h
index dfabd6d..4ed8071 100644
--- a/include/linux/mfd/axp20x.h
+++ b/include/linux/mfd/axp20x.h
@@ -275,4 +275,9 @@ struct axp20x_fg_pdata {
int thermistor_curve[MAX_THERM_CURVE_SIZE][2];
};
+struct axp288_extcon_pdata {
+ /* GPIO pin control to switch D+/D- lines b/w PMIC and SOC */
+ struct gpio_desc *gpio_mux_cntl;
+};
+
#endif /* __LINUX_MFD_AXP20X_H */
--
1.7.9.5
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