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- CC: Grant Likely <grant.likely@secretlab.ca>
- CC: Linus Walleij <linus.walleij@stericsson.com>
- Signed-off-by: Diego Elio Pettenò <flameeyes@flameeyes.eu>
- MAINTAINERS | 5 +
- drivers/gpio/Kconfig | 11 ++
- drivers/gpio/Makefile | 1 +
- drivers/gpio/gpio-it87.c | 397 ++++++++++++++++++++++++++++++++++++++++++++++
- 4 files changed, 414 insertions(+), 0 deletions(-)
- create mode 100644 drivers/gpio/gpio-it87.c
- diff --git a/MAINTAINERS b/MAINTAINERS
- index 553ac10..a196f14 100644
- a/MAINTAINERS
- +++ b/MAINTAINERS
- @@ -3692,6 +3692,11 @@ S: Maintained
- F: Documentation/hwmon/it87
- F: drivers/hwmon/it87.c
- +IT87xx GPIO DRIVER
- +M: Diego Elio Pettenò <flameeyes@flameeyes.eu>
- +S: Maintained
- +F: drivers/gpio/gpio-it87.c
- +
- IVTV VIDEO4LINUX DRIVER
- M: Andy Walls <awalls@md.metrocast.net>
- L: ivtv-devel@ivtvdriver.org (moderated for non-subscribers)
- diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
- index 3359f1e..8dc26b7 100644
- a/drivers/gpio/Kconfig
- +++ b/drivers/gpio/Kconfig
- @@ -91,6 +91,17 @@ config GPIO_IT8761E
- help
- Say yes here to support GPIO functionality of IT8761E super I/O chip.
- +config GPIO_IT87
- + tristate "IT87xx GPIO support"
- + depends on X86 # unconditional access to IO space.
- + help
- + Say yes here to support GPIO functionality of IT87xx Super I/O chips.
- +
- + This driver currently supports ITE IT8728 Super I/O chips.
- +
- + To compile this driver as a module, choose M here: the module will
- + be called gpio_it87
- +
- config GPIO_EP93XX
- def_bool y
- depends on ARCH_EP93XX
- diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
- index 41fe67f..affe510 100644
- a/drivers/gpio/Makefile
- +++ b/drivers/gpio/Makefile
- @@ -18,6 +18,7 @@ obj-$(CONFIG_ARCH_DAVINCI) += gpio-davinci.o
- obj-$(CONFIG_GPIO_EP93XX) += gpio-ep93xx.o
- obj-$(CONFIG_GPIO_ICH) += gpio-ich.o
- obj-$(CONFIG_GPIO_IT8761E) += gpio-it8761e.o
- +obj-$(CONFIG_GPIO_IT87) += gpio-it87.o
- obj-$(CONFIG_GPIO_JANZ_TTL) += gpio-janz-ttl.o
- obj-$(CONFIG_ARCH_KS8695) += gpio-ks8695.o
- obj-$(CONFIG_GPIO_LANGWELL) += gpio-langwell.o
- diff --git a/drivers/gpio/gpio-it87.c b/drivers/gpio/gpio-it87.c
- new file mode 100644
- index 0000000..958c126
- /dev/null
- +++ b/drivers/gpio/gpio-it87.c
- @@ -0,0 +1,397 @@
- +/*
- + * GPIO interface for IT87xx Super I/O chips
- + *
- + * Author: Diego Elio Pettenò <flameeyes@flameeyes.eu>
- + *
- + * Based on it87_wdt.c by Oliver Schuster
- + * gpio-it8761e.c by Denis Turischev
- + *
- + * This program is free software; you can redistribute it and/or modify
- + * it under the terms of the GNU General Public License 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.
- + *
- + * You should have received a copy of the GNU General Public License
- + * along with this program; see the file COPYING. If not, write to
- + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- + */
- +
- +#include <linux/init.h>
- +#include <linux/kernel.h>
- +#include <linux/module.h>
- +#include <linux/io.h>
- +#include <linux/errno.h>
- +#include <linux/ioport.h>
- +
- +#include <linux/gpio.h>
- +
- +#define GPIO_NAME "it87-gpio"
- +#define PFX GPIO_NAME ": "
- +
- +/* Chip Id numbers */
- +#define NO_DEV_ID 0xffff
- +#define IT8728_ID 0x8728
- +
- +/* IO Ports */
- +#define REG 0x2e
- +#define VAL 0x2f
- +
- +/* Logical device Numbers LDN */
- +#define GPIO 0x07
- +
- +/* Configuration Registers and Functions */
- +#define LDNREG 0x07
- +#define CHIPID 0x20
- +#define CHIPREV 0x22
- +
- +/* GPIO Simple I/O Base Address registers */
- +#define GPIO_BASE 0x62
- +#define GPIO_IOSIZE 8
- +
- +/* GPIO polarity inverting registers base */
- +#define GPIO_PS_BASE 0xb0 /* to 0xb4 */
- +/* Simple I/O Enable registers base */
- +#define GPIO_SE_BASE 0xc0 /* to 0xc4 */
- +#define GPIO_SE_SIZE 5
- +/* Output Enable registers base */
- +#define GPIO_OE_BASE 0xc8 /* to 0xcf */
- +
- +/* Superio Chip */
- +
- +static inline int superio_enter(void)
- +{
- + /*
- + * Try to reserve REG and REG + 1 for exclusive access.
- + */
- + if (!request_muxed_region(REG, 2, GPIO_NAME))
- + return -EBUSY;
- +
- + outb(0x87, REG);
- + outb(0x01, REG);
- + outb(0x55, REG);
- + outb(0x55, REG);
- + return 0;
- +}
- +
- +static inline void superio_exit(void)
- +{
- + outb(0x02, REG);
- + outb(0x02, VAL);
- + release_region(REG, 2);
- +}
- +
- +static inline void superio_select(int ldn)
- +{
- + outb(LDNREG, REG);
- + outb(ldn, VAL);
- +}
- +
- +static inline int superio_inb(int reg)
- +{
- + outb(reg, REG);
- + return inb(VAL);
- +}
- +
- +static inline void superio_outb(int val, int reg)
- +{
- + outb(reg, REG);
- + outb(val, VAL);
- +}
- +
- +static inline int superio_inw(int reg)
- +{
- + int val;
- + outb(reg++, REG);
- + val = inb(VAL) << 8;
- + outb(reg, REG);
- + val |= inb(VAL);
- + return val;
- +}
- +
- +static inline void superio_outw(int val, int reg)
- +{
- + outb(reg++, REG);
- + outb(val >> 8, VAL);
- + outb(reg, REG);
- + outb(val, VAL);
- +}
- +
- +static inline void superio_set_bit(int bit, int reg)
- +{
- + u8 curr_val = superio_inb(reg);
- + u8 new_val = curr_val | 1 << bit;
- +
- + if (curr_val != new_val)
- + superio_outb(new_val, reg);
- +}
- +
- +static inline void superio_clear_bit(int bit, int reg)
- +{
- + u8 curr_val = superio_inb(reg);
- + u8 new_val = curr_val & ~(1 << bit);
- +
- + if (curr_val != new_val)
- + superio_outb(new_val, reg);
- +}
- +
- +static u16 gpio_ba;
- +
- +static int it87_gpio_request(struct gpio_chip *gc, unsigned gpio_num)
- +{
- + u8 bit, group;
- + int rc;
- +
- + bit = gpio_num % 8;
- + group = (gpio_num / 8);
- +
- + if ((rc = superio_enter()))
- + return rc;
- +
- + /* enable Simple I/O on the GPIO pin, removing alternate
- + * function; only the first five groups are programmable as
- + * either Simple I/O or alternate function, the final free are
- + * always set to Simple I/O.
- + *
- + * This might differ depending on chip type so it could have
- + * to be made configurable.
- + */
- + if (group >= GPIO_SE_SIZE)
- + superio_set_bit(bit, group + GPIO_SE_BASE);
- +
- + /* clear output enable, setting the pin to input, as all the
- + * newly-exported GPIO interfaces are set to input.
- + */
- + superio_clear_bit(bit, group + GPIO_OE_BASE);
- +
- + superio_exit();
- +
- + return 0;
- +}
- +
- +static int it87_gpio_get(struct gpio_chip *gc, unsigned gpio_num)
- +{
- + u16 reg;
- + u8 bit;
- +
- + bit = gpio_num % 8;
- + reg = (gpio_num / 8) + gpio_ba;
- +
- + return !!(inb(reg) & (1 << bit));
- +}
- +
- +static int it87_gpio_direction_in(struct gpio_chip *gc, unsigned gpio_num)
- +{
- + u8 bit, group;
- + int rc;
- +
- + bit = gpio_num % 8;
- + group = (gpio_num / 8);
- +
- + if ((rc = superio_enter()))
- + return rc;
- +
- + /* clear the output enable bit */
- + superio_clear_bit(bit, group + GPIO_OE_BASE);
- +
- + superio_exit();
- +
- + return 0;
- +}
- +
- +static void it87_gpio_set(struct gpio_chip *gc,
- + unsigned gpio_num, int val)
- +{
- + unsigned long flags;
- + u8 curr_vals, bit;
- + u16 reg;
- +
- + bit = gpio_num % 8;
- + reg = (gpio_num / 8) + gpio_ba;
- +
- + curr_vals = inb(reg);
- + if (val)
- + outb(curr_vals | (1 << bit) , reg);
- + else
- + outb(curr_vals & ~(1 << bit), reg);
- +}
- +
- +static int it87_gpio_direction_out(struct gpio_chip *gc,
- + unsigned gpio_num, int val)
- +{
- + u8 bit, group;
- + int rc;
- +
- + bit = gpio_num % 8;
- + group = (gpio_num / 8);
- +
- + if ((rc = superio_enter()))
- + return rc;
- +
- + /* set the output enable bit */
- + superio_set_bit(bit, group + GPIO_OE_BASE);
- +
- + it87_gpio_set(gc, gpio_num, val);
- +
- + superio_exit();
- +
- + return 0;
- +}
- +
- +/* ITE documentation refers to the GPIO registers as coordinates of
- + * group/bit; we alias them as otherwise it becomes hard to find a
- + * correlation between the chip's offsets and the names in the
- + * documentation.
- + */
- +static const char *const it87_gpio_aliases[] = {
- + "it87_gp10",
- + "it87_gp11",
- + "it87_gp12",
- + "it87_gp13",
- + "it87_gp14",
- + "it87_gp15",
- + "it87_gp16",
- + "it87_gp17",
- + "it87_gp20",
- + "it87_gp21",
- + "it87_gp22",
- + "it87_gp23",
- + "it87_gp24",
- + "it87_gp25",
- + "it87_gp26",
- + "it87_gp27",
- + "it87_gp30",
- + "it87_gp31",
- + "it87_gp32",
- + "it87_gp33",
- + "it87_gp34",
- + "it87_gp35",
- + "it87_gp36",
- + "it87_gp37",
- + "it87_gp40",
- + "it87_gp41",
- + "it87_gp42",
- + "it87_gp43",
- + "it87_gp44",
- + "it87_gp45",
- + "it87_gp46",
- + "it87_gp47",
- + "it87_gp50",
- + "it87_gp51",
- + "it87_gp52",
- + "it87_gp53",
- + "it87_gp54",
- + "it87_gp55",
- + "it87_gp56",
- + "it87_gp57",
- + "it87_gp60",
- + "it87_gp61",
- + "it87_gp62",
- + "it87_gp63",
- + "it87_gp64",
- + "it87_gp65",
- + "it87_gp66",
- + "it87_gp67",
- + "it87_gp70",
- + "it87_gp71",
- + "it87_gp72",
- + "it87_gp73",
- + "it87_gp74",
- + "it87_gp75",
- + "it87_gp76",
- + "it87_gp77",
- + "it87_gp80",
- + "it87_gp81",
- + "it87_gp82",
- + "it87_gp83",
- + "it87_gp84",
- + "it87_gp85",
- + "it87_gp86",
- + "it87_gp87"
- +};
- +
- +static struct gpio_chip it87_gpio_chip = {
- + .label = GPIO_NAME,
- + .owner = THIS_MODULE,
- + .request = it87_gpio_request,
- + .get = it87_gpio_get,
- + .direction_input = it87_gpio_direction_in,
- + .set = it87_gpio_set,
- + .direction_output = it87_gpio_direction_out,
- + .names = it87_gpio_aliases
- +};
- +
- +static int __init it87_gpio_init(void)
- +{
- + int rc = 0;
- + u8 chip_rev;
- + u16 chip_type;
- +
- + if ((rc = superio_enter()))
- + return rc;
- +
- + chip_type = superio_inw(CHIPID);
- + chip_rev = superio_inb(CHIPREV) & 0x0f;
- + superio_exit();
- +
- + switch(chip_type) {
- + case IT8728_ID:
- + break;
- + case NO_DEV_ID:
- + printk(KERN_ERR PFX "no device");
- + return -ENODEV;
- + default:
- + printk(KERN_ERR PFX
- + "Unknown Chip found, Chip %04x Revision %x",
- + chip_type, chip_rev);
- + return -ENODEV;
- + }
- +
- + if ((rc = superio_enter()))
- + return rc;
- +
- + superio_select(GPIO);
- +
- + /* fetch GPIO base address */
- + gpio_ba = superio_inw(GPIO_BASE);
- +
- + superio_exit();
- +
- + if (!request_region(gpio_ba, GPIO_IOSIZE, GPIO_NAME))
- + return -EBUSY;
- +
- + it87_gpio_chip.base = -1;
- + it87_gpio_chip.ngpio = 64;
- +
- + if ((rc = gpiochip_add(&it87_gpio_chip)) < 0)
- + goto gpiochip_add_err;
- +
- + return 0;
- +
- +gpiochip_add_err:
- + release_region(gpio_ba, GPIO_IOSIZE);
- + gpio_ba = 0;
- + return rc;
- +}
- +
- +static void __exit it87_gpio_exit(void)
- +{
- + if (gpio_ba) {
- + int ret = gpiochip_remove(&it87_gpio_chip);
- +
- + WARN(ret, "%s(): gpiochip_remove() failed, ret=%d",
- + __func__, ret);
- +
- + release_region(gpio_ba, GPIO_IOSIZE);
- + gpio_ba = 0;
- + }
- +}
- +module_init(it87_gpio_init);
- +module_exit(it87_gpio_exit);
- +
- +MODULE_AUTHOR("Diego Elio Pettenò <flameeyes@flameeyes.eu>");
- +MODULE_DESCRIPTION("GPIO interface for IT87xx Super I/O chips");
- +MODULE_LICENSE("GPL");
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