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 */ 70struct 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 */ 83