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Message-ID: <20151001015832.GA11317@sophia> Date: Wed, 30 Sep 2015 21:58:32 -0400 From: William Breathitt Gray <vilhelm.gray@...il.com> To: linus.walleij@...aro.org, gnurou@...il.com Cc: linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org Subject: [PATCH] GPIO: Add GPIO support for the ACCES 104-IDIO-16 The ACCES 104-IDIO-16 family of PC/104 utility boards feature 16 optically isolated inputs and 16 optically isolated FET solid state outputs. This driver provides GPIO support for these 32 channels of digital I/O. Change-of-State detection interrupts are not supported. GPIO 0-15 correspond to digital outputs 0-15, while GPIO 16-31 correspond to digital inputs 0-15. Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com> --- drivers/gpio/Kconfig | 14 ++++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-104-idio-16.c | 154 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 169 insertions(+) create mode 100644 drivers/gpio/gpio-104-idio-16.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 8949b3f..6309071 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -684,6 +684,20 @@ config GPIO_SX150X endmenu +menu "ISA GPIO expanders" + +menuconfig GPIO_104_IDIO_16 + tristate "ACCES 104-IDIO-16 GPIO support" + help + Enables GPIO support for the ACCES 104-IDIO-16 family. + +config 104_IDIO_16_BASE + hex "ACCES 104-IDIO-16 base address" + depends on GPIO_104_IDIO_16 + default 0x000 + +endmenu + menu "MFD GPIO expanders" config GPIO_ADP5520 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index f79a7c4..6f2fea5 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_GPIO_ACPI) += gpiolib-acpi.o # Device drivers. Generally keep list sorted alphabetically obj-$(CONFIG_GPIO_GENERIC) += gpio-generic.o +obj-$(CONFIG_GPIO_104_IDIO_16) += gpio-104-idio-16.o obj-$(CONFIG_GPIO_74X164) += gpio-74x164.o obj-$(CONFIG_GPIO_74XX_MMIO) += gpio-74xx-mmio.o obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c new file mode 100644 index 0000000..5e3e89d --- /dev/null +++ b/drivers/gpio/gpio-104-idio-16.c @@ -0,0 +1,154 @@ +/* + * GPIO driver for the ACCES 104-IDIO-16 family + * Copyright (C) 2015 William Breathitt Gray + * + * 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/gpio.h> +#include <linux/io.h> +#include <linux/ioport.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/printk.h> +#include <linux/spinlock.h> + +struct a_104_idio_16_gpio { + struct gpio_chip chip; + spinlock_t lock; + unsigned base; + unsigned data; +}; + +#define to_a104i16gp(chip) container_of(chip, struct a_104_idio_16_gpio, chip) + +static void __exit a_104_idio_16_exit(void); +static int a_104_idio_16_gpio_direction_input(struct gpio_chip *chip, + unsigned offset); +static int a_104_idio_16_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int value); +static int a_104_idio_16_gpio_get(struct gpio_chip *chip, unsigned offset); +static void a_104_idio_16_gpio_set(struct gpio_chip *chip, unsigned offset, + int value); +static int __init a_104_idio_16_init(void); + +static const unsigned A_104_IDIO_16_EXTENT = 8; + +static struct a_104_idio_16_gpio gp = { + .chip = { + .label = "104-IDIO-16 GPIO", + .owner = THIS_MODULE, + .base = -1, + .ngpio = 32, + .direction_input = a_104_idio_16_gpio_direction_input, + .direction_output = a_104_idio_16_gpio_direction_output, + .get = a_104_idio_16_gpio_get, + .set = a_104_idio_16_gpio_set + }, + .base = CONFIG_104_IDIO_16_BASE +}; + +static void __exit a_104_idio_16_exit(void) +{ + pr_info("104-idio-16: Exiting 104-idio-16 module\n"); + + gpiochip_remove(&gp.chip); + release_region(CONFIG_104_IDIO_16_BASE, A_104_IDIO_16_EXTENT); +} + +static int a_104_idio_16_gpio_direction_input(struct gpio_chip *chip, + unsigned offset) +{ + return 0; +} + +static int a_104_idio_16_gpio_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + chip->set(chip, offset, value); + return 0; +} + +static int a_104_idio_16_gpio_get(struct gpio_chip *chip, unsigned offset) +{ + struct a_104_idio_16_gpio *a104i16gp = to_a104i16gp(chip); + const unsigned BIT_MASK = 1U << (offset-16); + + if (offset < 16) + return 0; + + if (offset < 24) + return !!(inb(a104i16gp->base + 1) & BIT_MASK); + + return !!(inb(a104i16gp->base + 5) & (BIT_MASK>>8)); +} + +static void a_104_idio_16_gpio_set(struct gpio_chip *chip, unsigned offset, + int value) +{ + struct a_104_idio_16_gpio *a104i16gp = to_a104i16gp(chip); + const unsigned BIT_MASK = 1U << offset; + unsigned long flags; + + if (offset > 15) + return; + + spin_lock_irqsave(&a104i16gp->lock, flags); + + if (value) + a104i16gp->data |= BIT_MASK; + else + a104i16gp->data &= ~BIT_MASK; + + if (offset > 7) + outb(~a104i16gp->data >> 8, a104i16gp->base + 4); + else + outb(~a104i16gp->data, a104i16gp->base); + + spin_unlock_irqrestore(&a104i16gp->lock, flags); +} + +static int __init a_104_idio_16_init(void) +{ + int err = 0; + + pr_info("104-idio-16: Initializing 104-idio-16 module\n"); + + if (!request_region(CONFIG_104_IDIO_16_BASE, A_104_IDIO_16_EXTENT, + "104-idio-16")) { + pr_err("104-idio-16: Unable to lock 104-idio-16 port addresses (0x%X-0x%X)\n", + CONFIG_104_IDIO_16_BASE, + CONFIG_104_IDIO_16_BASE + A_104_IDIO_16_EXTENT); + err = -EBUSY; + goto out_lock_a_104_idio_16_port; + } + + spin_lock_init(&gp.lock); + + pr_info("104-idio-16: 104-IDIO-16 GPIO detected\n"); + err = gpiochip_add(&gp.chip); + if (err) { + pr_err("104-idio-16: GPIO registering failed (%d)\n", err); + goto out_gpio_register; + } + + return 0; + +out_gpio_register: + release_region(CONFIG_104_IDIO_16_BASE, A_104_IDIO_16_EXTENT); +out_lock_a_104_idio_16_port: + return err; +} + +module_init(a_104_idio_16_init); +module_exit(a_104_idio_16_exit); + +MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@...il.com>"); +MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver"); +MODULE_LICENSE("GPL"); -- 2.4.9 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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