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Date: Thu, 25 Sep 2014 11:21:58 +0530
From: Muthu Mani <muth@...ress.com>
To: Samuel Ortiz <sameo@...ux.intel.com>,
Lee Jones <lee.jones@...aro.org>,
Wolfram Sang <wsa@...-dreams.de>, <linux-i2c@...r.kernel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Alexandre Courbot <gnurou@...il.com>,
<linux-gpio@...r.kernel.org>, <gregkh@...uxfoundation.org>,
<linux-usb@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, Muthu Mani <muth@...ress.com>,
Rajaram Regupathy <rera@...ress.com>,
Johan Hovold <johan@...nel.org>
Subject: [PATCH v2 3/3] gpio: add support for Cypress CYUSBS234 USB-GPIO adapter
Adds support for USB-GPIO interface of Cypress Semiconductor
CYUSBS234 USB-Serial Bridge controller.
The GPIO get/set can be done through vendor command on control endpoint.
Details about the device can be found at:
http://www.cypress.com/?rID=84126
Signed-off-by: Muthu Mani <muth@...ress.com>
Signed-off-by: Rajaram Regupathy <rera@...ress.com>
---
drivers/gpio/Kconfig | 13 +++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-cyusbs23x.c | 182 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 196 insertions(+)
create mode 100644 drivers/gpio/gpio-cyusbs23x.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 9de1515..932e07c 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -886,6 +886,19 @@ config GPIO_BCM_KONA
comment "USB GPIO expanders:"
+config GPIO_CYUSBS23X
+ tristate "CYUSBS23x GPIO support"
+ depends on MFD_CYUSBS23X && USB
+ help
+ Say yes here to access the GPIO signals of Cypress
+ Semiconductor CYUSBS23x USB Serial Bridge Controller.
+
+ This driver enables the GPIO interface of CYUSBS23x USB Serial
+ Bridge controller.
+
+ This driver can also be built as a module. If so, the module will be
+ called gpio-cyusbs23x.
+
config GPIO_VIPERBOARD
tristate "Viperboard GPIO a & b support"
depends on MFD_VIPERBOARD && USB
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 5d024e3..3ad89f1 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o
obj-$(CONFIG_GPIO_CLPS711X) += gpio-clps711x.o
obj-$(CONFIG_GPIO_CS5535) += gpio-cs5535.o
obj-$(CONFIG_GPIO_CRYSTAL_COVE) += gpio-crystalcove.o
+obj-$(CONFIG_GPIO_CYUSBS23X) += gpio-cyusbs23x.o
obj-$(CONFIG_GPIO_DA9052) += gpio-da9052.o
obj-$(CONFIG_GPIO_DA9055) += gpio-da9055.o
obj-$(CONFIG_GPIO_DAVINCI) += gpio-davinci.o
diff --git a/drivers/gpio/gpio-cyusbs23x.c b/drivers/gpio/gpio-cyusbs23x.c
new file mode 100644
index 0000000..ad83b00
--- /dev/null
+++ b/drivers/gpio/gpio-cyusbs23x.c
@@ -0,0 +1,182 @@
+/*
+ * GPIO subdriver for Cypress CYUSBS234 USB-Serial Bridge controller.
+ * Details about the device can be found at:
+ * http://www.cypress.com/?rID=84126
+ * All GPIOs are exposed for get operation and only unused GPIOs can be set.
+ *
+ * Copyright (c) 2014 Cypress Semiconductor Corporation.
+ *
+ * Author:
+ * Muthu Mani <muth@...ress.com>
+ *
+ * Additional contributors include:
+ * Rajaram Regupathy <rera@...ress.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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+
+#include <linux/usb.h>
+#include <linux/gpio.h>
+
+#include <linux/mfd/cyusbs23x.h>
+
+#define CY_GPIO_GET_LEN (2)
+
+struct cyusbs_gpio {
+ struct gpio_chip gpio;
+ struct cyusbs23x *cyusbs;
+};
+
+static int cy_gpio_get(struct gpio_chip *chip,
+ unsigned offset)
+{
+ int ret;
+ char *buf;
+ u16 wIndex, wValue;
+ struct cyusbs_gpio *gpio =
+ container_of(chip, struct cyusbs_gpio, gpio);
+ struct cyusbs23x *cyusbs = gpio->cyusbs;
+
+ dev_dbg(&cyusbs->usb_intf->dev, "%s: %d\n", __func__,
+ offset);
+ wValue = offset;
+ wIndex = 0;
+ buf = kmalloc(CY_GPIO_GET_LEN, GFP_KERNEL);
+
+ mutex_lock(&cyusbs->lock);
+ ret = usb_control_msg(cyusbs->usb_dev,
+ usb_rcvctrlpipe(cyusbs->usb_dev, 0),
+ CY_GPIO_GET_VALUE_CMD,
+ USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
+ wValue, wIndex, buf, CY_GPIO_GET_LEN, 2000);
+ mutex_unlock(&cyusbs->lock);
+
+ dev_dbg(&cyusbs->usb_intf->dev, "%s: %d %02x %02x\n", __func__,
+ ret, buf[0], buf[1]);
+
+ if (ret == CY_GPIO_GET_LEN) {
+ if (buf[0] == 0)
+ ret = buf[1];
+ else
+ ret = -EINVAL;
+ } else {
+ ret = -EREMOTEIO;
+ }
+
+ kfree(buf);
+ return ret;
+}
+
+static void cy_gpio_set(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ int ret;
+ u16 wIndex, wValue;
+ struct cyusbs_gpio *gpio =
+ container_of(chip, struct cyusbs_gpio, gpio);
+ struct cyusbs23x *cyusbs = gpio->cyusbs;
+
+ dev_dbg(&cyusbs->usb_intf->dev, "%s: %d\n", __func__,
+ offset);
+ wValue = offset;
+ wIndex = value;
+
+ mutex_lock(&cyusbs->lock);
+ ret = usb_control_msg(cyusbs->usb_dev,
+ usb_sndctrlpipe(cyusbs->usb_dev, 0),
+ CY_GPIO_SET_VALUE_CMD,
+ USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
+ wValue, wIndex, NULL, 0, 2000);
+ mutex_unlock(&cyusbs->lock);
+
+ if (ret < 0)
+ dev_err(&cyusbs->usb_intf->dev, "error setting gpio:%d\n", ret);
+}
+
+static int cy_gpio_direction_input(struct gpio_chip *chip,
+ unsigned offset)
+{
+ return 0;
+}
+
+static int cy_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ return 0;
+}
+
+static int cyusbs23x_gpio_probe(struct platform_device *pdev)
+{
+ struct cyusbs23x *cyusbs;
+ struct cyusbs_gpio *cy_gpio;
+ int ret = 0;
+
+ dev_dbg(&pdev->dev, "%s\n", __func__);
+
+ cyusbs = dev_get_drvdata(pdev->dev.parent);
+
+ cy_gpio = devm_kzalloc(&pdev->dev, sizeof(*cy_gpio), GFP_KERNEL);
+ if (cy_gpio == NULL)
+ return -ENOMEM;
+
+ cy_gpio->cyusbs = cyusbs;
+ /* registering gpio */
+ cy_gpio->gpio.label = dev_name(&pdev->dev);
+ cy_gpio->gpio.dev = &pdev->dev;
+ cy_gpio->gpio.owner = THIS_MODULE;
+ cy_gpio->gpio.base = -1;
+ cy_gpio->gpio.ngpio = 12; /* total GPIOs */
+ cy_gpio->gpio.can_sleep = true;
+ cy_gpio->gpio.set = cy_gpio_set;
+ cy_gpio->gpio.get = cy_gpio_get;
+ cy_gpio->gpio.direction_input = cy_gpio_direction_input;
+ cy_gpio->gpio.direction_output = cy_gpio_direction_output;
+ ret = gpiochip_add(&cy_gpio->gpio);
+ if (ret < 0) {
+ dev_err(cy_gpio->gpio.dev, "could not add gpio");
+ goto error;
+ }
+
+ platform_set_drvdata(pdev, cy_gpio);
+
+ dev_dbg(&pdev->dev, "added GPIO\n");
+ return ret;
+
+error:
+ dev_dbg(&pdev->dev, "error occured %d\n", ret);
+ return ret;
+}
+
+static int cyusbs23x_gpio_remove(struct platform_device *pdev)
+{
+ struct cyusbs_gpio *cy_gpio = platform_get_drvdata(pdev);
+
+ dev_dbg(&pdev->dev, "%s\n", __func__);
+ gpiochip_remove(&cy_gpio->gpio);
+ return 0;
+}
+
+static struct platform_driver cyusbs23x_gpio_driver = {
+ .driver.name = "cyusbs23x-gpio",
+ .driver.owner = THIS_MODULE,
+ .probe = cyusbs23x_gpio_probe,
+ .remove = cyusbs23x_gpio_remove,
+};
+
+module_platform_driver(cyusbs23x_gpio_driver);
+
+MODULE_AUTHOR("Rajaram Regupathy <rera@...ress.com>");
+MODULE_AUTHOR("Muthu Mani <muth@...ress.com>");
+MODULE_DESCRIPTION("GPIO driver for CYUSBS23x");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:cyusbs23x-gpio");
--
1.8.3.2
--
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