From 3344984bec2e94392987af0ae6498a92ccea169e Mon Sep 17 00:00:00 2001
From: Bin Yang <yangbin@rock-chips.com>
Date: Thu, 15 Dec 2016 18:29:07 +0800
Subject: [PATCH] misc: add usb camera pd pin control driver
Change-Id: Id6ad835c2fff43167a52f90c19e7e6dfe93a4655
Signed-off-by: Bin Yang <yangbin@rock-chips.com>
---
.../devicetree/bindings/misc/usb_cam_gpio.txt | 16 ++
drivers/misc/Kconfig | 6 +
drivers/misc/Makefile | 1 +
drivers/misc/usb_cam_gpio.c | 192 ++++++++++++++++++
4 files changed, 215 insertions(+)
create mode 100644 Documentation/devicetree/bindings/misc/usb_cam_gpio.txt
create mode 100644 drivers/misc/usb_cam_gpio.c
diff --git a/Documentation/devicetree/bindings/misc/usb_cam_gpio.txt b/Documentation/devicetree/bindings/misc/usb_cam_gpio.txt
new file mode 100644
index 000000000000..2e7a44ed65de
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/usb_cam_gpio.txt
@@ -0,0 +1,16 @@
+* Rockchip USB camera GPIO control driver
+
+Required properties:
+- compatible: should be "usb-cam-gpio"
+- hd-cam-pin: HD camera on gpio pin
+- ir-cam-pin: IR camera on gpio pin
+
+Example:
+ usb_cam_gpio: usb-cam-gpio {
+ compatible = "usb-cam-gpio";
+ pinctrl-names = "default";
+ pinctrl-0 = <&usb_cam_on_gpio>;
+ hd-cam-pin = <&gpio3 GPIO_A1 GPIO_ACTIVE_LOW>;
+ ir-cam-pin = <&gpio3 GPIO_A2 GPIO_ACTIVE_HIGH>;
+ status = "okay";
+ };
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 84c2e7f663b1..4727abb80ed9 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -544,6 +544,12 @@ config MEMORY_STATE_TIME
help
Memory time statistics exported to /sys/kernel/memory_state_time
+config USB_CAM_GPIO
+ bool "usb camera gpio driver"
+ default n
+ help
+ Enable this driver will support usb camera gpio control
+
source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 589997197504..06750b942827 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -59,3 +59,4 @@ obj-$(CONFIG_VEXPRESS_SYSCFG) += vexpress-syscfg.o
obj-$(CONFIG_CXL_BASE) += cxl/
obj-$(CONFIG_UID_CPUTIME) += uid_cputime.o
obj-$(CONFIG_MEMORY_STATE_TIME) += memory_state_time.o
+obj-$(CONFIG_USB_CAM_GPIO) += usb_cam_gpio.o
diff --git a/drivers/misc/usb_cam_gpio.c b/drivers/misc/usb_cam_gpio.c
new file mode 100644
index 000000000000..15930c366e69
--- /dev/null
+++ b/drivers/misc/usb_cam_gpio.c
@@ -0,0 +1,192 @@
+/*
+ * drivers/misc/usb_cam_gpio.c
+ *
+ * Copyright (C) 2012-2016 Rockchip Co.,Ltd.
+ * Author: Bin Yang <yangbin@rock-chips.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/platform_device.h>
+#include <linux/slab.h>
+#include <linux/miscdevice.h>
+#include <linux/gpio.h>
+#include <linux/uaccess.h>
+#include <linux/atomic.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/freezer.h>
+#include <linux/of_gpio.h>
+
+static struct class *usb_cam_gpio_class;
+
+struct usb_cam_gpio {
+ struct device *dev;
+ struct device sys_dev;
+
+ struct gpio_desc *gpio_cam_hd;
+ struct gpio_desc *gpio_cam_ir;
+};
+
+static ssize_t hd_camera_on_show(struct device *sys_dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct usb_cam_gpio *gpiod = container_of(sys_dev, struct usb_cam_gpio,
+ sys_dev);
+
+ return sprintf(buf, "%d\n", gpiod_get_value(gpiod->gpio_cam_hd));
+}
+
+static ssize_t hd_camera_on_store(struct device *sys_dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct usb_cam_gpio *gpiod = container_of(sys_dev, struct usb_cam_gpio,
+ sys_dev);
+ int val = 0;
+ int ret = 0;
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret < 0)
+ return ret;
+ if (val)
+ val = 1;
+ gpiod_set_value(gpiod->gpio_cam_hd, val);
+
+ return count;
+}
+static DEVICE_ATTR_RW(hd_camera_on);
+
+static ssize_t ir_camera_on_show(struct device *sys_dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct usb_cam_gpio *gpiod = container_of(sys_dev,
+ struct usb_cam_gpio, sys_dev);
+
+ return sprintf(buf, "%d\n", gpiod_get_value(gpiod->gpio_cam_ir));
+}
+
+static ssize_t ir_camera_on_store(struct device *sys_dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct usb_cam_gpio *gpiod = container_of(sys_dev,
+ struct usb_cam_gpio, sys_dev);
+ int val;
+ int ret;
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret < 0)
+ return ret;
+ if (val)
+ val = 1;
+ gpiod_set_value(gpiod->gpio_cam_ir, val);
+
+ return count;
+}
+static DEVICE_ATTR_RW(ir_camera_on);
+
+static struct attribute *usb_cam_gpio_attrs[] = {
+ &dev_attr_hd_camera_on.attr,
+ &dev_attr_ir_camera_on.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(usb_cam_gpio);
+
+static int usb_cam_gpio_device_register(struct usb_cam_gpio *gpiod)
+{
+ int ret;
+ struct device *dev = &gpiod->sys_dev;
+ const char *name = {"usb_camera_on"};
+
+ dev->class = usb_cam_gpio_class;
+ dev_set_name(dev, "%s", name);
+ dev_set_drvdata(dev, gpiod);
+ ret = device_register(dev);
+
+ return ret;
+}
+
+static int usb_cam_gpio_probe(struct platform_device *pdev)
+{
+ struct usb_cam_gpio *gpiod;
+ int ret = 0;
+
+ usb_cam_gpio_class = class_create(THIS_MODULE, "usb_cam_gpio");
+ if (IS_ERR(usb_cam_gpio_class)) {
+ pr_err("create uvc_detection class failed (%ld)\n",
+ PTR_ERR(usb_cam_gpio_class));
+ return PTR_ERR(usb_cam_gpio_class);
+ }
+ usb_cam_gpio_class->dev_groups = usb_cam_gpio_groups;
+
+ gpiod = devm_kzalloc(&pdev->dev, sizeof(*gpiod), GFP_KERNEL);
+ if (!gpiod)
+ return -ENOMEM;
+
+ gpiod->dev = &pdev->dev;
+
+ gpiod->gpio_cam_hd = devm_gpiod_get_optional(gpiod->dev,
+ "hd-cam", GPIOD_OUT_LOW);
+ if (IS_ERR(gpiod->gpio_cam_hd)) {
+ dev_warn(gpiod->dev, "Could not get hd-cam-gpios!\n");
+ gpiod->gpio_cam_hd = NULL;
+ }
+
+ gpiod->gpio_cam_ir = devm_gpiod_get_optional(gpiod->dev,
+ "ir-cam", GPIOD_OUT_HIGH);
+ if (IS_ERR(gpiod->gpio_cam_ir)) {
+ dev_warn(gpiod->dev, "Could not get ir-cam-gpios!\n");
+ gpiod->gpio_cam_ir = NULL;
+ }
+
+ ret = usb_cam_gpio_device_register(gpiod);
+ if (ret < 0) {
+ dev_err(gpiod->dev, "usb_cam_gpio device register fail\n");
+ return ret;
+ }
+
+ dev_info(gpiod->dev, "usb_cam_gpio_probe success\n");
+
+ return 0;
+}
+
+static const struct of_device_id usb_cam_gpio_match[] = {
+ { .compatible = "usb-cam-gpio" },
+ { /* Sentinel */ }
+};
+
+static int usb_cam_gpio_remove(struct platform_device *pdev)
+{
+ if (!IS_ERR(usb_cam_gpio_class))
+ class_destroy(usb_cam_gpio_class);
+
+ return 0;
+}
+
+static struct platform_driver usb_cam_gpio_driver = {
+ .probe = usb_cam_gpio_probe,
+ .remove = usb_cam_gpio_remove,
+ .driver = {
+ .name = "usb_cam_gpio",
+ .owner = THIS_MODULE,
+ .of_match_table = usb_cam_gpio_match,
+ },
+};
+
+module_platform_driver(usb_cam_gpio_driver);
+
+MODULE_ALIAS("platform:usb_cam_gpio");
+MODULE_AUTHOR("Bin Yang <yangbin@rock-chips.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("usb camera gpio driver");
--
2.34.1