From: Richard Vidal-Dorsch <richard.dorsch@xxxxxxxxx> --- drivers/gpio/Kconfig | 8 ++ drivers/gpio/Makefile | 2 + drivers/gpio/imanager-ec-gpio.c | 98 ++++++++++++++++++++ drivers/gpio/imanager-gpio.c | 182 ++++++++++++++++++++++++++++++++++++++ include/linux/mfd/imanager/gpio.h | 27 ++++++ 5 files changed, 317 insertions(+) create mode 100644 drivers/gpio/imanager-ec-gpio.c create mode 100644 drivers/gpio/imanager-gpio.c create mode 100644 include/linux/mfd/imanager/gpio.h diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index b18bea0..0f80947 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -765,6 +765,14 @@ config GPIO_DLN2 This driver can also be built as a module. If so, the module will be called gpio-dln2. +config GPIO_IMANAGER + tristate "Advantech iManager GPIO support" + depends on MFD_IMANAGER + help + Say yes here to support Advantech iManager GPIO functionality + of some Advantech SOM, MIO, AIMB, and PCM modules/boards. + Requires mfd-core and imanager-core to function properly. + 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 986dbd8..0df55e4 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -41,6 +41,8 @@ obj-$(CONFIG_GPIO_F7188X) += gpio-f7188x.o obj-$(CONFIG_GPIO_GE_FPGA) += gpio-ge.o obj-$(CONFIG_GPIO_GRGPIO) += gpio-grgpio.o obj-$(CONFIG_GPIO_ICH) += gpio-ich.o +gpio-imanager-objs := imanager-gpio.o imanager-ec-gpio.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/imanager-ec-gpio.c b/drivers/gpio/imanager-ec-gpio.c new file mode 100644 index 0000000..cefc44d --- /dev/null +++ b/drivers/gpio/imanager-ec-gpio.c @@ -0,0 +1,98 @@ +/* + * Advantech iManager GPIO core + * + * Copyright (C) 2015 Advantech Co., Ltd., Irvine, CA, USA + * Author: Richard Vidal-Dorsch <richard.dorsch@xxxxxxxxxxxxx> + * + * 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. + */ + +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/bug.h> +#include <linux/io.h> +#include <linux/delay.h> +#include <linux/string.h> +#include <linux/byteorder/generic.h> +#include <linux/mfd/imanager/ec.h> +#include <linux/mfd/imanager/gpio.h> + +#define EC_GPIOF_DIR_OUT (1 << 6) +#define EC_GPIOF_DIR_IN (1 << 7) +#define EC_GPIOF_LOW (0 << 0) +#define EC_GPIOF_HIGH (1 << 0) + +/* + * Power-on default: + * GPIO[7..4] := Input + * GPIO[3..0] := Output + */ + +static const struct imanager_gpio_device *gpio; + +int gpio_core_get_state(u32 num) +{ + int ret; + + if (WARN_ON(num >= gpio->num)) + return -EINVAL; + + ret = imanager_read_byte(EC_CMD_HWP_RD, gpio->attr[num].did); + if (ret < 0) + pr_err("Failed to get GPIO pin state (%x)\n", num); + + return ret; +} + +int gpio_core_set_state(u32 num, bool state) +{ + int ret; + + if (WARN_ON(num >= gpio->num)) + return -EINVAL; + + ret = imanager_write_byte(EC_CMD_HWP_WR, gpio->attr[num].did, + state ? EC_GPIOF_HIGH : EC_GPIOF_LOW); + if (ret) { + pr_err("Failed to set GPIO pin state (%x)\n", num); + return ret; + } + + return 0; +} + +int gpio_core_set_direction(u32 num, int dir) +{ + int ret; + + if (WARN_ON(num >= gpio->num)) + return -EINVAL; + + ret = imanager_write_byte(EC_CMD_GPIO_DIR_WR, gpio->attr[num].did, + dir ? EC_GPIOF_DIR_IN : EC_GPIOF_DIR_OUT); + if (ret) { + pr_err("Failed to set GPIO direction (%x, '%s')\n", num, + dir == GPIOF_DIR_OUT ? "OUT" : "IN"); + return ret; + } + + return 0; +} + +int gpio_core_get_max_count(void) +{ + return gpio->num; +} + +int gpio_core_init(void) +{ + gpio = imanager_get_gpio_device(); + if (!gpio) + return -ENODEV; + + return 0; +} + diff --git a/drivers/gpio/imanager-gpio.c b/drivers/gpio/imanager-gpio.c new file mode 100644 index 0000000..3939c0f --- /dev/null +++ b/drivers/gpio/imanager-gpio.c @@ -0,0 +1,182 @@ +/* + * Advantech iManager GPIO driver + * + * Copyright (C) 2015 Advantech Co., Ltd., Irvine, CA, USA + * Author: Richard Vidal-Dorsch <richard.dorsch@xxxxxxxxxxxxx> + * + * 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/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/gpio.h> +#include <linux/mfd/imanager/core.h> +#include <linux/mfd/imanager/gpio.h> + +struct imanager_gpio_data { + struct imanager_device_data *idev; + struct gpio_chip chip; +}; + +static inline struct imanager_gpio_data * +to_imanager_gpio_data(struct gpio_chip *chip) +{ + return container_of(chip, struct imanager_gpio_data, chip); +} + +static int imanager_direction_in(struct gpio_chip *chip, u32 gpio_num) +{ + struct imanager_gpio_data *data = to_imanager_gpio_data(chip); + int ret; + + mutex_lock(&data->idev->lock); + + ret = gpio_core_set_direction(gpio_num, GPIOF_DIR_IN); + if (ret) { + dev_err(chip->dev, "Failed to set direction to 'in' (%d)\n", + gpio_num); + ret = -EIO; + } + + mutex_unlock(&data->idev->lock); + + return ret; +} + +static int +imanager_direction_out(struct gpio_chip *chip, u32 gpio_num, int val) +{ + struct imanager_gpio_data *data = to_imanager_gpio_data(chip); + int ret; + + mutex_lock(&data->idev->lock); + + ret = gpio_core_set_direction(gpio_num, GPIOF_DIR_OUT); + if (ret) { + dev_err(chip->dev, "Failed to set direction to 'out' (%d)\n", + gpio_num); + ret = -EIO; + } + + mutex_unlock(&data->idev->lock); + + return ret; +} + +static int imanager_get(struct gpio_chip *chip, u32 gpio_num) +{ + struct imanager_gpio_data *data = to_imanager_gpio_data(chip); + int ret; + + mutex_lock(&data->idev->lock); + + ret = gpio_core_get_state(gpio_num); + if (ret < 0) { + dev_err(chip->dev, "Failed to get status (%d)\n", gpio_num); + ret = -EIO; + } + + mutex_unlock(&data->idev->lock); + + return ret; +} + +static void imanager_set(struct gpio_chip *chip, u32 gpio_num, + int val) +{ + struct imanager_gpio_data *data = to_imanager_gpio_data(chip); + int ret; + + mutex_lock(&data->idev->lock); + + ret = gpio_core_set_state(gpio_num, val); + if (ret < 0) + dev_err(chip->dev, "Failed to set status (%d)\n", gpio_num); + + mutex_unlock(&data->idev->lock); +} + +static int imanager_gpio_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct imanager_device_data *idev = dev_get_drvdata(dev->parent); + struct imanager_gpio_data *data; + struct gpio_chip *chip; + int ret; + + if (!idev) { + dev_err(dev, "Invalid platform data\n"); + return -EINVAL; + } + + ret = gpio_core_init(); + if (ret) { + dev_err(dev, "Failed initializing GPIO core\n"); + return ret; + } + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->idev = idev; + + platform_set_drvdata(pdev, data); + + chip = &data->chip; + + chip->owner = THIS_MODULE; + chip->dev = dev; + chip->label = "imanager_gpio"; + + chip->base = -1; + chip->ngpio = gpio_core_get_max_count(); + + chip->get = imanager_get; + chip->set = imanager_set; + + chip->can_sleep = 1; + + chip->direction_input = imanager_direction_in; + chip->direction_output = imanager_direction_out; + + ret = gpiochip_add(chip); + if (ret < 0) { + dev_err(dev, "Failed to register driver\n"); + return ret; + } + + return 0; +} + +static int imanager_remove(struct platform_device *pdev) +{ + struct imanager_gpio_data *data = platform_get_drvdata(pdev); + + gpiochip_remove(&data->chip); + + return 0; +} + +static struct platform_driver imanager_gpio_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "imanager_gpio", + }, + .probe = imanager_gpio_probe, + .remove = imanager_remove, +}; + +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"); diff --git a/include/linux/mfd/imanager/gpio.h b/include/linux/mfd/imanager/gpio.h new file mode 100644 index 0000000..7b76727 --- /dev/null +++ b/include/linux/mfd/imanager/gpio.h @@ -0,0 +1,27 @@ +/* + * Advantech iManager GPIO core + * + * Copyright (C) 2015 Advantech Co., Ltd., Irvine, CA, USA + * Author: Richard Vidal-Dorsch <richard.dorsch@xxxxxxxxxxxxx> + * + * 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. + */ + +#ifndef __GPIO_H__ +#define __GPIO_H__ + +#include <linux/gpio.h> +#include <linux/types.h> + +int gpio_core_init(void); + +int gpio_core_get_max_count(void); + +int gpio_core_get_state(u32 num); +int gpio_core_set_state(u32 num, bool state); +int gpio_core_set_direction(u32 num, int dir); + +#endif -- 2.6.4 -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html