Re: [PATCH] gpio: Add support for PC8741x SuperIO chip GPIOs

[Jonathan McDowell]

I never saw any reply to the below. Was there some problem with it, or
did it just get forgotten about?

(Also the VSC055 GPIO driver that Jonathan Cameron commented on seemed
to disappear into the ether too. Were more changes to it necessary?)

On Wed, Apr 20, 2011 at 11:34:34AM -0700, Jonathan McDowell wrote:
> Add support for the GPIOs on the National Semiconductor/Winbond
> PC87413/87414/87416/87417 SuperIO LPC family.
> 
> These chips feature 51 GPIOs (46 configurable as input or output, 5
> output only).
> 
> Signed-off-by: Jonathan McDowell <noodles@xxxxxxxx>
> 
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 664660e..cc150db 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -81,6 +81,17 @@ config GPIO_IT8761E
>  	help
>  	  Say yes here to support GPIO functionality of IT8761E super I/O chip.
>  
> +config GPIO_PC8741X
> +	tristate "PC8741x SuperIO GPIO support"
> +	depends on GPIOLIB
> +	help
> +	  Say yes here to support the GPIO functionality of the
> +	  PC87413/87414/87416/87417 SuperIO chips. These chips contain a
> +	  total of 51 GPIOs.
> +
> +	  This driver can also be built as a module.  If so, the module
> +	  will be called pc8741x_gpio.
> +
>  config GPIO_PL061
>  	bool "PrimeCell PL061 GPIO support"
>  	depends on ARM_AMBA
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 3351cf8..d2752b2 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -19,6 +19,7 @@ obj-$(CONFIG_GPIO_MAX732X)	+= max732x.o
>  obj-$(CONFIG_GPIO_MC33880)	+= mc33880.o
>  obj-$(CONFIG_GPIO_MCP23S08)	+= mcp23s08.o
>  obj-$(CONFIG_GPIO_74X164)	+= 74x164.o
> +obj-$(CONFIG_GPIO_PC8741X)	+= pc8741x_gpio.o
>  obj-$(CONFIG_GPIO_PCA953X)	+= pca953x.o
>  obj-$(CONFIG_GPIO_PCF857X)	+= pcf857x.o
>  obj-$(CONFIG_GPIO_PCH)		+= pch_gpio.o
> diff --git a/drivers/gpio/pc8741x_gpio.c b/drivers/gpio/pc8741x_gpio.c
> new file mode 100644
> index 0000000..cea084a
> --- /dev/null
> +++ b/drivers/gpio/pc8741x_gpio.c
> @@ -0,0 +1,271 @@
> +/*
> + *  pc8741x_gpio.c - GPIO interface for PC87413/4/6/7 Super I/O chip
> + *
> + *  Copyright 2011 Jonathan McDowell <noodles@xxxxxxxx>
> + *
> + *  Based on drivers/gpio/it8761e_gpio.c
> + *
> + *  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 PC8741X_CHIP_ID		0xEE
> +
> +#define PC8741X_FUNC_SEL	0x07
> +#define PC8741X_SID		0x20
> +#define PC8741X_SRID		0x27
> +#define PC8741X_FUNC_ENABLE	0x30
> +#define PC8741X_BASE_HIGH	0x60
> +#define PC8741X_BASE_LOW	0x61
> +
> +#define PC8741X_GPSEL		0xF0
> +#define PC8741X_GPCFG1		0xF1
> +#define PC8741X_GPEVR		0xF2
> +#define PC8741X_GPCFG2		0xF3
> +
> +#define PC8741X_FUNC_GPIO	0x07
> +
> +static u8 ports[2] = { 0x2e, 0x4e };
> +static u8 port;
> +
> +static u8 block_in_offs[6] = { 1, 3, 7, 9, 11, 15 };
> +static u8 block_out_offs[7] = { 0, 2, 6, 8, 10, 14, 16 };
> +
> +static DEFINE_SPINLOCK(pc8741x_sio_lock);
> +
> +#define GPIO_NAME		"pc8741x-gpio"
> +#define GPIO_IOSIZE		17
> +
> +static u16 gpio_ba;
> +
> +static int pc8741x_superio_enter(int base)
> +{
> +	if (!request_muxed_region(base, 2, GPIO_NAME))
> +		return -EBUSY;
> +
> +	return 0;
> +}
> +
> +static void pc8741x_superio_exit(int base)
> +{
> +	release_region(base, 2);
> +}
> +
> +static u8 pc8741x_read_reg(u8 addr, u8 port)
> +{
> +	outb(addr, port);
> +	return inb(port + 1);
> +}
> +
> +static void pc8741x_write_reg(u8 data, u8 addr, u8 port)
> +{
> +	outb(addr, port);
> +	outb(data, port + 1);
> +}
> +
> +static void pc8741x_select_func(u8 port, u8 func)
> +{
> +	pc8741x_write_reg(func, PC8741X_FUNC_SEL, port);
> +}
> +
> +static int pc8741x_gpio_get(struct gpio_chip *gc, unsigned gpio_num)
> +{
> +	u8 block, pin;
> +
> +	if (gpio_num < 46) {
> +		block = gpio_num >> 3;
> +		pin = gpio_num & 7;
> +	} else {
> +		/* Block 6 is output only */
> +		return 0;
> +	}
> +
> +	return !!(inb(gpio_ba + block_in_offs[block]) & (1 << pin));
> +}
> +
> +static int pc8741x_gpio_direction_in(struct gpio_chip *gc, unsigned gpio_num)
> +{
> +	u8 block, pin, cur;
> +	int err;
> +
> +	if (gpio_num < 46) {
> +		block = gpio_num >> 3;
> +		pin = gpio_num & 7;
> +	} else {
> +		/* Block 6 is output only */
> +		return -EINVAL;
> +	}
> +
> +	err = pc8741x_superio_enter(port);
> +	if (err)
> +		return err;
> +
> +	pc8741x_select_func(port, PC8741X_FUNC_GPIO);
> +	pc8741x_write_reg(block << 4 & pin, PC8741X_GPSEL, port);
> +
> +	cur = pc8741x_read_reg(PC8741X_GPCFG1, port);
> +
> +	if (cur & 1)
> +		pc8741x_write_reg(cur & ~1, PC8741X_GPCFG1, port);
> +
> +	pc8741x_superio_exit(port);
> +	return 0;
> +}
> +
> +static void pc8741x_gpio_set(struct gpio_chip *gc,
> +				unsigned gpio_num, int val)
> +{
> +	u8 block, pin, cur;
> +
> +	if (gpio_num < 46) {
> +		block = gpio_num >> 3;
> +		pin = gpio_num & 7;
> +	} else {
> +		block = 6;
> +		pin = gpio_num - 46;
> +	}
> +
> +	spin_lock(&pc8741x_sio_lock);
> +
> +	cur = inb(gpio_ba + block_out_offs[block]);
> +
> +	if (val)
> +		outb(cur | (1 << pin), gpio_ba + block_out_offs[block]);
> +	else
> +		outb(cur & ~(1 << pin), gpio_ba + block_out_offs[block]);
> +
> +	spin_unlock(&pc8741x_sio_lock);
> +}
> +
> +static int pc8741x_gpio_direction_out(struct gpio_chip *gc, unsigned gpio_num,
> +					int val)
> +{
> +	u8 block, pin, cur;
> +	int err;
> +
> +	pc8741x_gpio_set(gc, gpio_num, val);
> +
> +	if (gpio_num < 46) {
> +		block = gpio_num >> 3;
> +		pin = gpio_num & 7;
> +	} else {
> +		block = 6;
> +		pin = gpio_num - 47;
> +	}
> +
> +	err = pc8741x_superio_enter(port);
> +	if (err)
> +		return err;
> +
> +	pc8741x_select_func(port, PC8741X_FUNC_GPIO);
> +	pc8741x_write_reg(block << 4 & pin, PC8741X_GPSEL, port);
> +
> +	cur = pc8741x_read_reg(PC8741X_GPCFG1, port);
> +
> +	if (!(cur & 1))
> +		pc8741x_write_reg(cur | 1, PC8741X_GPCFG1, port);
> +
> +	pc8741x_superio_exit(port);
> +
> +	return 0;
> +}
> +
> +static struct gpio_chip pc8741x_gpio_chip = {
> +	.label			= GPIO_NAME,
> +	.owner			= THIS_MODULE,
> +	.get			= pc8741x_gpio_get,
> +	.direction_input	= pc8741x_gpio_direction_in,
> +	.set			= pc8741x_gpio_set,
> +	.direction_output	= pc8741x_gpio_direction_out,
> +};
> +
> +static int __init pc8741x_gpio_init(void)
> +{
> +	int i, id, err;
> +
> +	/* chip and port detection */
> +	for (i = 0; i < ARRAY_SIZE(ports); i++) {
> +		if (!pc8741x_superio_enter(ports[i])) {
> +
> +			id = pc8741x_read_reg(PC8741X_SID, ports[i]);
> +
> +			pc8741x_superio_exit(ports[i]);
> +
> +			if (id == PC8741X_CHIP_ID) {
> +				port = ports[i];
> +				break;
> +			}
> +		}
> +	}
> +
> +	if (!port)
> +		return -ENODEV;
> +
> +	err = pc8741x_superio_enter(port);
> +	if (err)
> +		return err;
> +	id = pc8741x_read_reg(PC8741X_SRID, port);
> +	printk(KERN_INFO "pc8741x_gpio: Found PC8741x revision %d\n", id);
> +
> +	/* fetch GPIO base address */
> +	pc8741x_select_func(port, PC8741X_FUNC_GPIO);
> +	pc8741x_write_reg(1, PC8741X_FUNC_ENABLE, port);
> +	gpio_ba = (pc8741x_read_reg(PC8741X_BASE_HIGH, port) << 8) +
> +				pc8741x_read_reg(PC8741X_BASE_LOW, port);
> +	pc8741x_superio_exit(port);
> +
> +	if (!request_region(gpio_ba, GPIO_IOSIZE, GPIO_NAME))
> +		return -EBUSY;
> +
> +	pc8741x_gpio_chip.base = -1;
> +	pc8741x_gpio_chip.ngpio = 51;
> +
> +	err = gpiochip_add(&pc8741x_gpio_chip);
> +	if (err < 0)
> +		goto gpiochip_add_err;
> +
> +	return 0;
> +
> +gpiochip_add_err:
> +	release_region(gpio_ba, GPIO_IOSIZE);
> +	gpio_ba = 0;
> +	return err;
> +}
> +
> +static void __exit pc8741x_gpio_exit(void)
> +{
> +	if (gpio_ba) {
> +		int ret = gpiochip_remove(&pc8741x_gpio_chip);
> +
> +		WARN(ret, "%s(): gpiochip_remove() failed, ret=%d\n",
> +				__func__, ret);
> +
> +		release_region(gpio_ba, GPIO_IOSIZE);
> +		gpio_ba = 0;
> +	}
> +}
> +module_init(pc8741x_gpio_init);
> +module_exit(pc8741x_gpio_exit);
> +
> +MODULE_AUTHOR("Jonathan McDowell <noodles@xxxxxxxx>");
> +MODULE_DESCRIPTION("GPIO interface for PC87413/4/6/7 Super I/O chip");
> +MODULE_LICENSE("GPL");

J.

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