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path: root/drivers/extcon/extcon-palmas.c
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-rw-r--r--drivers/extcon/extcon-palmas.c434
1 files changed, 434 insertions, 0 deletions
diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
new file mode 100644
index 000000000..32f8b5417
--- /dev/null
+++ b/drivers/extcon/extcon-palmas.c
@@ -0,0 +1,434 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Palmas USB transceiver driver
+ *
+ * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com
+ * Author: Graeme Gregory <gg@slimlogic.co.uk>
+ * Author: Kishon Vijay Abraham I <kishon@ti.com>
+ * Based on twl6030_usb.c
+ * Author: Hema HK <hemahk@ti.com>
+ */
+
+#include <linux/devm-helpers.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/mfd/palmas.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/workqueue.h>
+
+#define USB_GPIO_DEBOUNCE_MS 20 /* ms */
+
+static const unsigned int palmas_extcon_cable[] = {
+ EXTCON_USB,
+ EXTCON_USB_HOST,
+ EXTCON_NONE,
+};
+
+static void palmas_usb_wakeup(struct palmas *palmas, int enable)
+{
+ if (enable)
+ palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,
+ PALMAS_USB_WAKEUP_ID_WK_UP_COMP);
+ else
+ palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);
+}
+
+static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
+{
+ struct palmas_usb *palmas_usb = _palmas_usb;
+ struct extcon_dev *edev = palmas_usb->edev;
+ unsigned int vbus_line_state;
+
+ palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,
+ PALMAS_INT3_LINE_STATE, &vbus_line_state);
+
+ if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {
+ if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
+ palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
+ extcon_set_state_sync(edev, EXTCON_USB, true);
+ dev_dbg(palmas_usb->dev, "USB cable is attached\n");
+ } else {
+ dev_dbg(palmas_usb->dev,
+ "Spurious connect event detected\n");
+ }
+ } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {
+ if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
+ palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
+ extcon_set_state_sync(edev, EXTCON_USB, false);
+ dev_dbg(palmas_usb->dev, "USB cable is detached\n");
+ } else {
+ dev_dbg(palmas_usb->dev,
+ "Spurious disconnect event detected\n");
+ }
+ }
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
+{
+ unsigned int set, id_src;
+ struct palmas_usb *palmas_usb = _palmas_usb;
+ struct extcon_dev *edev = palmas_usb->edev;
+
+ palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_INT_LATCH_SET, &set);
+ palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_INT_SRC, &id_src);
+
+ if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
+ (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_INT_LATCH_CLR,
+ PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
+ palmas_usb->linkstat = PALMAS_USB_STATE_ID;
+ extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
+ dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
+ } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
+ (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_INT_LATCH_CLR,
+ PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
+ palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
+ extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
+ dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
+ } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
+ (!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
+ palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
+ extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
+ dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
+ } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
+ (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
+ palmas_usb->linkstat = PALMAS_USB_STATE_ID;
+ extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
+ dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void palmas_gpio_id_detect(struct work_struct *work)
+{
+ int id;
+ struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
+ struct palmas_usb,
+ wq_detectid);
+ struct extcon_dev *edev = palmas_usb->edev;
+
+ if (!palmas_usb->id_gpiod)
+ return;
+
+ id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);
+
+ if (id) {
+ extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
+ dev_dbg(palmas_usb->dev, "USB-HOST cable is detached\n");
+ } else {
+ extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
+ dev_dbg(palmas_usb->dev, "USB-HOST cable is attached\n");
+ }
+}
+
+static irqreturn_t palmas_gpio_id_irq_handler(int irq, void *_palmas_usb)
+{
+ struct palmas_usb *palmas_usb = _palmas_usb;
+
+ queue_delayed_work(system_power_efficient_wq, &palmas_usb->wq_detectid,
+ palmas_usb->sw_debounce_jiffies);
+
+ return IRQ_HANDLED;
+}
+
+static void palmas_enable_irq(struct palmas_usb *palmas_usb)
+{
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_VBUS_CTRL_SET,
+ PALMAS_USB_VBUS_CTRL_SET_VBUS_ACT_COMP);
+
+ if (palmas_usb->enable_id_detection) {
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_CTRL_SET,
+ PALMAS_USB_ID_CTRL_SET_ID_ACT_COMP);
+
+ palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+ PALMAS_USB_ID_INT_EN_HI_SET,
+ PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
+ PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
+ }
+
+ if (palmas_usb->enable_vbus_detection)
+ palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
+
+ /* cold plug for host mode needs this delay */
+ if (palmas_usb->enable_id_detection) {
+ msleep(30);
+ palmas_id_irq_handler(palmas_usb->id_irq, palmas_usb);
+ }
+}
+
+static int palmas_usb_probe(struct platform_device *pdev)
+{
+ struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
+ struct palmas_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ struct device_node *node = pdev->dev.of_node;
+ struct palmas_usb *palmas_usb;
+ int status;
+
+ if (!palmas) {
+ dev_err(&pdev->dev, "failed to get valid parent\n");
+ return -EINVAL;
+ }
+
+ palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL);
+ if (!palmas_usb)
+ return -ENOMEM;
+
+ if (node && !pdata) {
+ palmas_usb->wakeup = of_property_read_bool(node, "ti,wakeup");
+ palmas_usb->enable_id_detection = of_property_read_bool(node,
+ "ti,enable-id-detection");
+ palmas_usb->enable_vbus_detection = of_property_read_bool(node,
+ "ti,enable-vbus-detection");
+ } else {
+ palmas_usb->wakeup = true;
+ palmas_usb->enable_id_detection = true;
+ palmas_usb->enable_vbus_detection = true;
+
+ if (pdata)
+ palmas_usb->wakeup = pdata->wakeup;
+ }
+
+ palmas_usb->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id",
+ GPIOD_IN);
+ if (IS_ERR(palmas_usb->id_gpiod))
+ return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->id_gpiod),
+ "failed to get id gpio\n");
+
+ palmas_usb->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
+ GPIOD_IN);
+ if (IS_ERR(palmas_usb->vbus_gpiod))
+ return dev_err_probe(&pdev->dev, PTR_ERR(palmas_usb->vbus_gpiod),
+ "failed to get id gpio\n");
+
+ if (palmas_usb->enable_id_detection && palmas_usb->id_gpiod) {
+ palmas_usb->enable_id_detection = false;
+ palmas_usb->enable_gpio_id_detection = true;
+ }
+
+ if (palmas_usb->enable_vbus_detection && palmas_usb->vbus_gpiod) {
+ palmas_usb->enable_vbus_detection = false;
+ palmas_usb->enable_gpio_vbus_detection = true;
+ }
+
+ if (palmas_usb->enable_gpio_id_detection) {
+ u32 debounce;
+
+ if (of_property_read_u32(node, "debounce-delay-ms", &debounce))
+ debounce = USB_GPIO_DEBOUNCE_MS;
+
+ status = gpiod_set_debounce(palmas_usb->id_gpiod,
+ debounce * 1000);
+ if (status < 0)
+ palmas_usb->sw_debounce_jiffies = msecs_to_jiffies(debounce);
+ }
+
+ status = devm_delayed_work_autocancel(&pdev->dev,
+ &palmas_usb->wq_detectid,
+ palmas_gpio_id_detect);
+ if (status)
+ return status;
+
+ palmas->usb = palmas_usb;
+ palmas_usb->palmas = palmas;
+
+ palmas_usb->dev = &pdev->dev;
+
+ palmas_usb_wakeup(palmas, palmas_usb->wakeup);
+
+ platform_set_drvdata(pdev, palmas_usb);
+
+ palmas_usb->edev = devm_extcon_dev_allocate(&pdev->dev,
+ palmas_extcon_cable);
+ if (IS_ERR(palmas_usb->edev)) {
+ dev_err(&pdev->dev, "failed to allocate extcon device\n");
+ return -ENOMEM;
+ }
+
+ status = devm_extcon_dev_register(&pdev->dev, palmas_usb->edev);
+ if (status) {
+ dev_err(&pdev->dev, "failed to register extcon device\n");
+ return status;
+ }
+
+ if (palmas_usb->enable_id_detection) {
+ palmas_usb->id_otg_irq = regmap_irq_get_virq(palmas->irq_data,
+ PALMAS_ID_OTG_IRQ);
+ palmas_usb->id_irq = regmap_irq_get_virq(palmas->irq_data,
+ PALMAS_ID_IRQ);
+ status = devm_request_threaded_irq(palmas_usb->dev,
+ palmas_usb->id_irq,
+ NULL, palmas_id_irq_handler,
+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
+ IRQF_ONESHOT,
+ "palmas_usb_id", palmas_usb);
+ if (status < 0) {
+ dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
+ palmas_usb->id_irq, status);
+ return status;
+ }
+ } else if (palmas_usb->enable_gpio_id_detection) {
+ palmas_usb->gpio_id_irq = gpiod_to_irq(palmas_usb->id_gpiod);
+ if (palmas_usb->gpio_id_irq < 0) {
+ dev_err(&pdev->dev, "failed to get id irq\n");
+ return palmas_usb->gpio_id_irq;
+ }
+ status = devm_request_threaded_irq(&pdev->dev,
+ palmas_usb->gpio_id_irq,
+ NULL,
+ palmas_gpio_id_irq_handler,
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING |
+ IRQF_ONESHOT,
+ "palmas_usb_id",
+ palmas_usb);
+ if (status < 0) {
+ dev_err(&pdev->dev,
+ "failed to request handler for id irq\n");
+ return status;
+ }
+ }
+
+ if (palmas_usb->enable_vbus_detection) {
+ palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
+ PALMAS_VBUS_OTG_IRQ);
+ palmas_usb->vbus_irq = regmap_irq_get_virq(palmas->irq_data,
+ PALMAS_VBUS_IRQ);
+ status = devm_request_threaded_irq(palmas_usb->dev,
+ palmas_usb->vbus_irq, NULL,
+ palmas_vbus_irq_handler,
+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING |
+ IRQF_ONESHOT,
+ "palmas_usb_vbus", palmas_usb);
+ if (status < 0) {
+ dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
+ palmas_usb->vbus_irq, status);
+ return status;
+ }
+ } else if (palmas_usb->enable_gpio_vbus_detection) {
+ /* remux GPIO_1 as VBUSDET */
+ status = palmas_update_bits(palmas,
+ PALMAS_PU_PD_OD_BASE,
+ PALMAS_PRIMARY_SECONDARY_PAD1,
+ PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK,
+ (1 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT));
+ if (status < 0) {
+ dev_err(&pdev->dev, "can't remux GPIO1\n");
+ return status;
+ }
+
+ palmas_usb->vbus_otg_irq = regmap_irq_get_virq(palmas->irq_data,
+ PALMAS_VBUS_OTG_IRQ);
+ palmas_usb->gpio_vbus_irq = gpiod_to_irq(palmas_usb->vbus_gpiod);
+ if (palmas_usb->gpio_vbus_irq < 0) {
+ dev_err(&pdev->dev, "failed to get vbus irq\n");
+ return palmas_usb->gpio_vbus_irq;
+ }
+ status = devm_request_threaded_irq(&pdev->dev,
+ palmas_usb->gpio_vbus_irq,
+ NULL,
+ palmas_vbus_irq_handler,
+ IRQF_TRIGGER_FALLING |
+ IRQF_TRIGGER_RISING |
+ IRQF_ONESHOT,
+ "palmas_usb_vbus",
+ palmas_usb);
+ if (status < 0) {
+ dev_err(&pdev->dev,
+ "failed to request handler for vbus irq\n");
+ return status;
+ }
+ }
+
+ palmas_enable_irq(palmas_usb);
+ /* perform initial detection */
+ if (palmas_usb->enable_gpio_vbus_detection)
+ palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
+ palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
+ device_set_wakeup_capable(&pdev->dev, true);
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int palmas_usb_suspend(struct device *dev)
+{
+ struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev)) {
+ if (palmas_usb->enable_vbus_detection)
+ enable_irq_wake(palmas_usb->vbus_irq);
+ if (palmas_usb->enable_gpio_vbus_detection)
+ enable_irq_wake(palmas_usb->gpio_vbus_irq);
+ if (palmas_usb->enable_id_detection)
+ enable_irq_wake(palmas_usb->id_irq);
+ if (palmas_usb->enable_gpio_id_detection)
+ enable_irq_wake(palmas_usb->gpio_id_irq);
+ }
+ return 0;
+}
+
+static int palmas_usb_resume(struct device *dev)
+{
+ struct palmas_usb *palmas_usb = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev)) {
+ if (palmas_usb->enable_vbus_detection)
+ disable_irq_wake(palmas_usb->vbus_irq);
+ if (palmas_usb->enable_gpio_vbus_detection)
+ disable_irq_wake(palmas_usb->gpio_vbus_irq);
+ if (palmas_usb->enable_id_detection)
+ disable_irq_wake(palmas_usb->id_irq);
+ if (palmas_usb->enable_gpio_id_detection)
+ disable_irq_wake(palmas_usb->gpio_id_irq);
+ }
+
+ /* check if GPIO states changed while suspend/resume */
+ if (palmas_usb->enable_gpio_vbus_detection)
+ palmas_vbus_irq_handler(palmas_usb->gpio_vbus_irq, palmas_usb);
+ palmas_gpio_id_detect(&palmas_usb->wq_detectid.work);
+
+ return 0;
+};
+#endif
+
+static SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_usb_suspend, palmas_usb_resume);
+
+static const struct of_device_id of_palmas_match_tbl[] = {
+ { .compatible = "ti,palmas-usb", },
+ { .compatible = "ti,palmas-usb-vid", },
+ { .compatible = "ti,twl6035-usb", },
+ { .compatible = "ti,twl6035-usb-vid", },
+ { /* end */ }
+};
+
+static struct platform_driver palmas_usb_driver = {
+ .probe = palmas_usb_probe,
+ .driver = {
+ .name = "palmas-usb",
+ .of_match_table = of_palmas_match_tbl,
+ .pm = &palmas_pm_ops,
+ },
+};
+
+module_platform_driver(palmas_usb_driver);
+
+MODULE_ALIAS("platform:palmas-usb");
+MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
+MODULE_DESCRIPTION("Palmas USB transceiver driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(of, of_palmas_match_tbl);