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Message-Id: <20161102083751.6335-3-richard.dorsch@gmail.com>
Date: Wed, 2 Nov 2016 01:37:47 -0700
From: Richard Vidal-Dorsch <richard.dorsch@...il.com>
To: linus.walleij@...aro.org, gnurou@...il.com, jdelvare@...e.com,
linux@...ck-us.net, wsa@...-dreams.de, lee.jones@...aro.org,
jingoohan1@...il.com, tomi.valkeinen@...com, wim@...ana.be,
linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
linux-hwmon@...r.kernel.org, linux-i2c@...r.kernel.org,
linux-fbdev@...r.kernel.org, linux-watchdog@...r.kernel.org,
k.kozlowski@...sung.com
Cc: Richard Vidal-Dorsch <richard.dorsch@...il.com>,
jo.sunga@...antech.com, weilun.huang@...antech.com,
andrew.chou@...antech.com
Subject: [PATCH v4 2/6] Add Advantech iManager GPIO driver
Signed-off-by: Richard Vidal-Dorsch <richard.dorsch@...il.com>
---
drivers/gpio/Kconfig | 10 +++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-imanager.c | 155 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 166 insertions(+)
create mode 100644 drivers/gpio/gpio-imanager.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index d011cb8..52e371f 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -884,6 +884,16 @@ config HTC_EGPIO
several HTC phones. It provides basic support for input
pins, output pins, and irqs.
+config GPIO_IMANAGER
+ tristate "Advantech iManager GPIO"
+ depends on MFD_IMANAGER
+ help
+ This enables support for the iManager GPIO interface on some
+ Advantech SOM, MIO, AIMB, and PCM modules/boards.
+
+ This driver can also be built as a module. If so, the module will be
+ called gpio-imanager.
+
config GPIO_JANZ_TTL
tristate "Janz VMOD-TTL Digital IO Module"
depends on MFD_JANZ_CMODIO
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index ab28a2d..e1250eb 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_GPIO_GPIO_MM) += gpio-gpio-mm.o
obj-$(CONFIG_GPIO_GRGPIO) += gpio-grgpio.o
obj-$(CONFIG_HTC_EGPIO) += gpio-htc-egpio.o
obj-$(CONFIG_GPIO_ICH) += gpio-ich.o
+obj-$(CONFIG_GPIO_IMANAGER) += gpio-imanager.o
obj-$(CONFIG_GPIO_IOP) += gpio-iop.o
obj-$(CONFIG_GPIO_IT87) += gpio-it87.o
obj-$(CONFIG_GPIO_JANZ_TTL) += gpio-janz-ttl.o
diff --git a/drivers/gpio/gpio-imanager.c b/drivers/gpio/gpio-imanager.c
new file mode 100644
index 0000000..f60592b
--- /dev/null
+++ b/drivers/gpio/gpio-imanager.c
@@ -0,0 +1,155 @@
+/*
+ * Advantech iManager GPIO driver
+ *
+ * Copyright (C) 2016 Advantech Co., Ltd.
+ * Author: Richard Vidal-Dorsch <richard.dorsch@...antech.com>
+ *
+ * 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.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/device.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/mfd/imanager.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+
+#define EC_GPIOF_DIR_OUT BIT(6)
+#define EC_GPIOF_DIR_IN BIT(7)
+
+struct imanager_gpio_data {
+ struct imanager_device_data *imgr;
+ struct gpio_chip chip;
+};
+
+static int imanager_gpio_direction_in(struct gpio_chip *chip, uint offset)
+{
+ struct imanager_gpio_data *data = gpiochip_get_data(chip);
+ struct imanager_device_data *imgr = data->imgr;
+ struct imanager_device_attribute *attr = imgr->ec.gpio.attr[offset];
+
+ mutex_lock(&imgr->lock);
+ imanager_write8(&imgr->ec, EC_CMD_GPIO_DIR_WR, attr->did,
+ EC_GPIOF_DIR_IN);
+ mutex_unlock(&imgr->lock);
+
+ return 0;
+}
+
+static int
+imanager_gpio_direction_out(struct gpio_chip *chip, uint offset, int val)
+{
+ struct imanager_gpio_data *data = gpiochip_get_data(chip);
+ struct imanager_device_data *imgr = data->imgr;
+ struct imanager_device_attribute *attr = imgr->ec.gpio.attr[offset];
+
+ mutex_lock(&imgr->lock);
+ imanager_write8(&imgr->ec, EC_CMD_GPIO_DIR_WR, attr->did,
+ EC_GPIOF_DIR_OUT);
+ mutex_unlock(&imgr->lock);
+
+ return 0;
+}
+
+static int imanager_gpio_get_direction(struct gpio_chip *chip, uint offset)
+{
+ struct imanager_gpio_data *data = gpiochip_get_data(chip);
+ struct imanager_device_data *imgr = data->imgr;
+ struct imanager_device_attribute *attr = imgr->ec.gpio.attr[offset];
+ int ret;
+
+ mutex_lock(&imgr->lock);
+ ret = imanager_read8(&imgr->ec, EC_CMD_GPIO_DIR_RD, attr->did);
+ mutex_unlock(&imgr->lock);
+
+ return ret & EC_GPIOF_DIR_IN ? GPIOF_DIR_IN : GPIOF_DIR_OUT;
+}
+
+static int imanager_gpio_get(struct gpio_chip *chip, uint offset)
+{
+ struct imanager_gpio_data *data = gpiochip_get_data(chip);
+ struct imanager_device_data *imgr = data->imgr;
+ struct imanager_device_attribute *attr = imgr->ec.gpio.attr[offset];
+ int ret;
+
+ mutex_lock(&imgr->lock);
+ ret = imanager_read8(&imgr->ec, EC_CMD_HWP_RD, attr->did);
+ mutex_unlock(&imgr->lock);
+
+ return ret;
+}
+
+static void imanager_gpio_set(struct gpio_chip *chip, uint offset, int val)
+{
+ struct imanager_gpio_data *data = gpiochip_get_data(chip);
+ struct imanager_device_data *imgr = data->imgr;
+ struct imanager_device_attribute *attr = imgr->ec.gpio.attr[offset];
+
+ mutex_lock(&imgr->lock);
+ imanager_write8(&imgr->ec, EC_CMD_HWP_WR, attr->did, val);
+ mutex_unlock(&imgr->lock);
+}
+
+static int imanager_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct imanager_device_data *imgr = dev_get_drvdata(dev->parent);
+ struct imanager_gpio_data *gpio;
+ struct gpio_chip *chip;
+ int ret;
+
+ gpio = devm_kzalloc(dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ gpio->imgr = imgr;
+
+ platform_set_drvdata(pdev, gpio);
+
+ chip = &gpio->chip;
+
+ chip->owner = THIS_MODULE;
+ chip->parent = dev;
+ chip->label = "gpio-imanager";
+ chip->base = -1;
+ chip->ngpio = imgr->ec.gpio.num;
+ chip->get = imanager_gpio_get;
+ chip->set = imanager_gpio_set;
+ chip->direction_input = imanager_gpio_direction_in;
+ chip->direction_output = imanager_gpio_direction_out;
+ chip->get_direction = imanager_gpio_get_direction;
+ if (!chip->ngpio) {
+ dev_err(dev, "No GPIO pins detected\n");
+ return -ENODEV;
+ }
+
+ ret = devm_gpiochip_add_data(dev, chip, gpio);
+ if (ret < 0) {
+ dev_err(dev, "Could not register GPIO chip\n");
+ return ret;
+ }
+
+ dev_info(dev, "GPIO initialized with %d pins\n", chip->ngpio);
+
+ return 0;
+}
+
+static struct platform_driver imanager_gpio_driver = {
+ .driver = {
+ .name = "imanager-gpio",
+ },
+ .probe = imanager_gpio_probe,
+};
+
+module_platform_driver(imanager_gpio_driver);
+
+MODULE_DESCRIPTION("Advantech iManager GPIO Driver");
+MODULE_AUTHOR("Richard Vidal-Dorsch <richard.dorsch at advantech.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:imanager-gpio");
--
2.10.1
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