Commit c34f16b7 authored by Gregory Bean's avatar Gregory Bean Committed by Linus Torvalds

gpio: sx150x: add Semtech I2C sx150x gpio expander driver

Add support for Semtech SX150-series I2C GPIO expanders.  Compatible
models include:

8 bits:  sx1508q
16 bits: sx1509q
Signed-off-by: default avatarGregory Bean <gbean@codeaurora.org>
Cc: David Brownell <david-b@pacbell.net>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Trilok Soni <tsoni@codeaurora.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 364fadb3
...@@ -195,6 +195,17 @@ config GPIO_PCF857X ...@@ -195,6 +195,17 @@ config GPIO_PCF857X
This driver provides an in-kernel interface to those GPIOs using This driver provides an in-kernel interface to those GPIOs using
platform-neutral GPIO calls. platform-neutral GPIO calls.
config GPIO_SX150X
bool "Semtech SX150x I2C GPIO expander"
depends on I2C=y
default n
help
Say yes here to provide support for Semtech SX150-series I2C
GPIO expanders. Compatible models include:
8 bits: sx1508q
16 bits: sx1509q
config GPIO_TC35892 config GPIO_TC35892
bool "TC35892 GPIOs" bool "TC35892 GPIOs"
depends on MFD_TC35892 depends on MFD_TC35892
......
...@@ -35,3 +35,4 @@ obj-$(CONFIG_GPIO_WM8994) += wm8994-gpio.o ...@@ -35,3 +35,4 @@ obj-$(CONFIG_GPIO_WM8994) += wm8994-gpio.o
obj-$(CONFIG_GPIO_SCH) += sch_gpio.o obj-$(CONFIG_GPIO_SCH) += sch_gpio.o
obj-$(CONFIG_GPIO_RDC321X) += rdc321x-gpio.o obj-$(CONFIG_GPIO_RDC321X) += rdc321x-gpio.o
obj-$(CONFIG_GPIO_JANZ_TTL) += janz-ttl.o obj-$(CONFIG_GPIO_JANZ_TTL) += janz-ttl.o
obj-$(CONFIG_GPIO_SX150X) += sx150x.o
This diff is collapsed.
/*
* Driver for the Semtech SX150x I2C GPIO Expanders
*
* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#ifndef __LINUX_I2C_SX150X_H
#define __LINUX_I2C_SX150X_H
/**
* struct sx150x_platform_data - config data for SX150x driver
* @gpio_base: The index number of the first GPIO assigned to this
* GPIO expander. The expander will create a block of
* consecutively numbered gpios beginning at the given base,
* with the size of the block depending on the model of the
* expander chip.
* @oscio_is_gpo: If set to true, the driver will configure OSCIO as a GPO
* instead of as an oscillator, increasing the size of the
* GP(I)O pool created by this expander by one. The
* output-only GPO pin will be added at the end of the block.
* @io_pullup_ena: A bit-mask which enables or disables the pull-up resistor
* for each IO line in the expander. Setting the bit at
* position n will enable the pull-up for the IO at
* the corresponding offset. For chips with fewer than
* 16 IO pins, high-end bits are ignored.
* @io_pulldn_ena: A bit-mask which enables-or disables the pull-down
* resistor for each IO line in the expander. Setting the
* bit at position n will enable the pull-down for the IO at
* the corresponding offset. For chips with fewer than
* 16 IO pins, high-end bits are ignored.
* @io_open_drain_ena: A bit-mask which enables-or disables open-drain
* operation for each IO line in the expander. Setting the
* bit at position n enables open-drain operation for
* the IO at the corresponding offset. Clearing the bit
* enables regular push-pull operation for that IO.
* For chips with fewer than 16 IO pins, high-end bits
* are ignored.
* @io_polarity: A bit-mask which enables polarity inversion for each IO line
* in the expander. Setting the bit at position n inverts
* the polarity of that IO line, while clearing it results
* in normal polarity. For chips with fewer than 16 IO pins,
* high-end bits are ignored.
* @irq_summary: The 'summary IRQ' line to which the GPIO expander's INT line
* is connected, via which it reports interrupt events
* across all GPIO lines. This must be a real,
* pre-existing IRQ line.
* Setting this value < 0 disables the irq_chip functionality
* of the driver.
* @irq_base: The first 'virtual IRQ' line at which our block of GPIO-based
* IRQ lines will appear. Similarly to gpio_base, the expander
* will create a block of irqs beginning at this number.
* This value is ignored if irq_summary is < 0.
*/
struct sx150x_platform_data {
unsigned gpio_base;
bool oscio_is_gpo;
u16 io_pullup_ena;
u16 io_pulldn_ena;
u16 io_open_drain_ena;
u16 io_polarity;
int irq_summary;
unsigned irq_base;
};
#endif /* __LINUX_I2C_SX150X_H */
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