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authorDavid Cohen <david.a.cohen@intel.com>2016-12-21 12:20:25 +0100
committerChanwoo Choi <cw00.choi@samsung.com>2017-01-09 10:04:11 +0900
commit2f556bdb9f2e3794722c0d9186db9799b35071c4 (patch)
tree99da983bc7c52a9d839064f8c8c140a55718c1bf /drivers/extcon/extcon-intel-int3496.c
parent5298b8365832e13158e41e205a31a9505eef4c94 (diff)
extcon: int3496: Add Intel INT3496 ACPI device extcon driver
Add an extcon driver for USB OTG ports controlled by an Intel INT3496 ACPI device (e.g. Baytrail, Cherrytrail devices). Signed-off-by: David Cohen <david.a.cohen@intel.com> [hdgoede@redhat.com: Port to current kernel, cleanup, submit upstream] [hdgoede@redhat.com: Add Documentation/extcon/intel-int3496.txt] Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Diffstat (limited to 'drivers/extcon/extcon-intel-int3496.c')
-rw-r--r--drivers/extcon/extcon-intel-int3496.c179
1 files changed, 179 insertions, 0 deletions
diff --git a/drivers/extcon/extcon-intel-int3496.c b/drivers/extcon/extcon-intel-int3496.c
new file mode 100644
index 000000000000..a3131b036de6
--- /dev/null
+++ b/drivers/extcon/extcon-intel-int3496.c
@@ -0,0 +1,179 @@
+/*
+ * Intel INT3496 ACPI device extcon driver
+ *
+ * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
+ *
+ * Based on android x86 kernel code which is:
+ *
+ * Copyright (c) 2014, Intel Corporation.
+ * Author: David Cohen <david.a.cohen@linux.intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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/acpi.h>
+#include <linux/extcon.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#define INT3496_GPIO_USB_ID 0
+#define INT3496_GPIO_VBUS_EN 1
+#define INT3496_GPIO_USB_MUX 2
+#define DEBOUNCE_TIME msecs_to_jiffies(50)
+
+struct int3496_data {
+ struct device *dev;
+ struct extcon_dev *edev;
+ struct delayed_work work;
+ struct gpio_desc *gpio_usb_id;
+ struct gpio_desc *gpio_vbus_en;
+ struct gpio_desc *gpio_usb_mux;
+ int usb_id_irq;
+};
+
+static const unsigned int int3496_cable[] = {
+ EXTCON_USB_HOST,
+ EXTCON_NONE,
+};
+
+static void int3496_do_usb_id(struct work_struct *work)
+{
+ struct int3496_data *data =
+ container_of(work, struct int3496_data, work.work);
+ int id = gpiod_get_value_cansleep(data->gpio_usb_id);
+
+ /* id == 1: PERIPHERAL, id == 0: HOST */
+ dev_dbg(data->dev, "Connected %s cable\n", id ? "PERIPHERAL" : "HOST");
+
+ /*
+ * Peripheral: set USB mux to peripheral and disable VBUS
+ * Host: set USB mux to host and enable VBUS
+ */
+ if (!IS_ERR(data->gpio_usb_mux))
+ gpiod_direction_output(data->gpio_usb_mux, id);
+
+ if (!IS_ERR(data->gpio_vbus_en))
+ gpiod_direction_output(data->gpio_vbus_en, !id);
+
+ extcon_set_state_sync(data->edev, EXTCON_USB_HOST, !id);
+}
+
+static irqreturn_t int3496_thread_isr(int irq, void *priv)
+{
+ struct int3496_data *data = priv;
+
+ /* Let the pin settle before processing it */
+ mod_delayed_work(system_wq, &data->work, DEBOUNCE_TIME);
+
+ return IRQ_HANDLED;
+}
+
+static int int3496_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct int3496_data *data;
+ int ret;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->dev = dev;
+ INIT_DELAYED_WORK(&data->work, int3496_do_usb_id);
+
+ data->gpio_usb_id = devm_gpiod_get_index(dev, "id",
+ INT3496_GPIO_USB_ID,
+ GPIOD_IN);
+ if (IS_ERR(data->gpio_usb_id)) {
+ ret = PTR_ERR(data->gpio_usb_id);
+ dev_err(dev, "can't request USB ID GPIO: %d\n", ret);
+ return ret;
+ }
+
+ data->usb_id_irq = gpiod_to_irq(data->gpio_usb_id);
+ if (data->usb_id_irq <= 0) {
+ dev_err(dev, "can't get USB ID IRQ: %d\n", data->usb_id_irq);
+ return -EINVAL;
+ }
+
+ data->gpio_vbus_en = devm_gpiod_get_index(dev, "vbus en",
+ INT3496_GPIO_VBUS_EN,
+ GPIOD_ASIS);
+ if (IS_ERR(data->gpio_vbus_en))
+ dev_info(dev, "can't request VBUS EN GPIO\n");
+
+ data->gpio_usb_mux = devm_gpiod_get_index(dev, "usb mux",
+ INT3496_GPIO_USB_MUX,
+ GPIOD_ASIS);
+ if (IS_ERR(data->gpio_usb_mux))
+ dev_info(dev, "can't request USB MUX GPIO\n");
+
+ /* register extcon device */
+ data->edev = devm_extcon_dev_allocate(dev, int3496_cable);
+ if (IS_ERR(data->edev))
+ return -ENOMEM;
+
+ ret = devm_extcon_dev_register(dev, data->edev);
+ if (ret < 0) {
+ dev_err(dev, "can't register extcon device: %d\n", ret);
+ return ret;
+ }
+
+ ret = devm_request_threaded_irq(dev, data->usb_id_irq,
+ NULL, int3496_thread_isr,
+ IRQF_SHARED | IRQF_ONESHOT |
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING,
+ dev_name(dev), data);
+ if (ret < 0) {
+ dev_err(dev, "can't request IRQ for USB ID GPIO: %d\n", ret);
+ return ret;
+ }
+
+ /* queue initial processing of id-pin */
+ queue_delayed_work(system_wq, &data->work, 0);
+
+ platform_set_drvdata(pdev, data);
+
+ return 0;
+}
+
+static int int3496_remove(struct platform_device *pdev)
+{
+ struct int3496_data *data = platform_get_drvdata(pdev);
+
+ devm_free_irq(&pdev->dev, data->usb_id_irq, data);
+ cancel_delayed_work_sync(&data->work);
+
+ return 0;
+}
+
+static struct acpi_device_id int3496_acpi_match[] = {
+ { "INT3496" },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, int3496_acpi_match);
+
+static struct platform_driver int3496_driver = {
+ .driver = {
+ .name = "intel-int3496",
+ .acpi_match_table = int3496_acpi_match,
+ },
+ .probe = int3496_probe,
+ .remove = int3496_remove,
+};
+
+module_platform_driver(int3496_driver);
+
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_DESCRIPTION("Intel INT3496 ACPI device extcon driver");
+MODULE_LICENSE("GPL");

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