include/linux/i2c/sx150x.h

   1 /*
   2  * Driver for the Semtech SX150x I2C GPIO Expanders
   3  *
   4  * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 and
   8  * only version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA.
  19  */
  20 #ifndef __LINUX_I2C_SX150X_H
  21 #define __LINUX_I2C_SX150X_H
  22
  23 /**
  24  * struct sx150x_platform_data - config data for SX150x driver
  25  * @gpio_base: The index number of the first GPIO assigned to this
  26  *             GPIO expander.  The expander will create a block of
  27  *             consecutively numbered gpios beginning at the given base,
  28  *             with the size of the block depending on the model of the
  29  *             expander chip.
  30  * @oscio_is_gpo: If set to true, the driver will configure OSCIO as a GPO
  31  *                instead of as an oscillator, increasing the size of the
  32  *                GP(I)O pool created by this expander by one.  The
  33  *                output-only GPO pin will be added at the end of the block.
  34  * @io_pullup_ena: A bit-mask which enables or disables the pull-up resistor
  35  *                 for each IO line in the expander.  Setting the bit at
  36  *                 position n will enable the pull-up for the IO at
  37  *                 the corresponding offset.  For chips with fewer than
  38  *                 16 IO pins, high-end bits are ignored.
  39  * @io_pulldn_ena: A bit-mask which enables-or disables the pull-down
  40  *                 resistor for each IO line in the expander. Setting the
  41  *                 bit at position n will enable the pull-down for the IO at
  42  *                 the corresponding offset.  For chips with fewer than
  43  *                 16 IO pins, high-end bits are ignored.
  44  * @io_open_drain_ena: A bit-mask which enables-or disables open-drain
  45  *                     operation for each IO line in the expander. Setting the
  46  *                     bit at position n enables open-drain operation for
  47  *                     the IO at the corresponding offset.  Clearing the bit
  48  *                     enables regular push-pull operation for that IO.
  49  *                     For chips with fewer than 16 IO pins, high-end bits
  50  *                     are ignored.
  51  * @io_polarity: A bit-mask which enables polarity inversion for each IO line
  52  *               in the expander.  Setting the bit at position n inverts
  53  *               the polarity of that IO line, while clearing it results
  54  *               in normal polarity. For chips with fewer than 16 IO pins,
  55  *               high-end bits are ignored.
  56  * @irq_summary: The 'summary IRQ' line to which the GPIO expander's INT line
  57  *               is connected, via which it reports interrupt events
  58  *               across all GPIO lines.  This must be a real,
  59  *               pre-existing IRQ line.
  60  *               Setting this value < 0 disables the irq_chip functionality
  61  *               of the driver.
  62  * @irq_base: The first 'virtual IRQ' line at which our block of GPIO-based
  63  *            IRQ lines will appear.  Similarly to gpio_base, the expander
  64  *            will create a block of irqs beginning at this number.
  65  *            This value is ignored if irq_summary is < 0.
  66  * @reset_during_probe: If set to true, the driver will trigger a full
  67  *                      reset of the chip at the beginning of the probe
  68  *                      in order to place it in a known state.
  69  */
  70 struct sx150x_platform_data {
  71         unsigned gpio_base;
  72         bool     oscio_is_gpo;
  73         u16      io_pullup_ena;
  74         u16      io_pulldn_ena;
  75         u16      io_open_drain_ena;
  76         u16      io_polarity;
  77         int      irq_summary;
  78         unsigned irq_base;
  79         bool     reset_during_probe;
  80 };
  81
  82 #endif /* __LINUX_I2C_SX150X_H */