diff options
Diffstat (limited to 'qemu/roms/u-boot/drivers/gpio/pca9698.c')
-rw-r--r-- | qemu/roms/u-boot/drivers/gpio/pca9698.c | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/qemu/roms/u-boot/drivers/gpio/pca9698.c b/qemu/roms/u-boot/drivers/gpio/pca9698.c deleted file mode 100644 index 3152bf6df..000000000 --- a/qemu/roms/u-boot/drivers/gpio/pca9698.c +++ /dev/null @@ -1,127 +0,0 @@ -/* - * (C) Copyright 2011 - * Dirk Eibach, Guntermann & Drunck GmbH, eibach@gdsys.de - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -/* - * Driver for NXP's pca9698 40 bit I2C gpio expander - */ - -#include <common.h> -#include <i2c.h> -#include <asm/errno.h> -#include <pca9698.h> - -/* - * The pca9698 registers - */ - -#define PCA9698_REG_INPUT 0x00 -#define PCA9698_REG_OUTPUT 0x08 -#define PCA9698_REG_POLARITY 0x10 -#define PCA9698_REG_CONFIG 0x18 - -#define PCA9698_BUFFER_SIZE 5 -#define PCA9698_GPIO_COUNT 40 - -static int pca9698_read40(u8 addr, u8 offset, u8 *buffer) -{ - u8 command = offset | 0x80; /* autoincrement */ - - return i2c_read(addr, command, 1, buffer, PCA9698_BUFFER_SIZE); -} - -static int pca9698_write40(u8 addr, u8 offset, u8 *buffer) -{ - u8 command = offset | 0x80; /* autoincrement */ - - return i2c_write(addr, command, 1, buffer, PCA9698_BUFFER_SIZE); -} - -static void pca9698_set_bit(unsigned gpio, u8 *buffer, unsigned value) -{ - unsigned byte = gpio / 8; - unsigned bit = gpio % 8; - - if (value) - buffer[byte] |= (1 << bit); - else - buffer[byte] &= ~(1 << bit); -} - -int pca9698_request(unsigned gpio, const char *label) -{ - if (gpio >= PCA9698_GPIO_COUNT) - return -EINVAL; - - return 0; -} - -void pca9698_free(unsigned gpio) -{ -} - -int pca9698_direction_input(u8 addr, unsigned gpio) -{ - u8 data[PCA9698_BUFFER_SIZE]; - int res; - - res = pca9698_read40(addr, PCA9698_REG_CONFIG, data); - if (res) - return res; - - pca9698_set_bit(gpio, data, 1); - - return pca9698_write40(addr, PCA9698_REG_CONFIG, data); -} - -int pca9698_direction_output(u8 addr, unsigned gpio, int value) -{ - u8 data[PCA9698_BUFFER_SIZE]; - int res; - - res = pca9698_set_value(addr, gpio, value); - if (res) - return res; - - res = pca9698_read40(addr, PCA9698_REG_CONFIG, data); - if (res) - return res; - - pca9698_set_bit(gpio, data, 0); - - return pca9698_write40(addr, PCA9698_REG_CONFIG, data); -} - -int pca9698_get_value(u8 addr, unsigned gpio) -{ - unsigned config_byte = gpio / 8; - unsigned config_bit = gpio % 8; - unsigned value; - u8 data[PCA9698_BUFFER_SIZE]; - int res; - - res = pca9698_read40(addr, PCA9698_REG_INPUT, data); - if (res) - return -1; - - value = data[config_byte] & (1 << config_bit); - - return !!value; -} - -int pca9698_set_value(u8 addr, unsigned gpio, int value) -{ - u8 data[PCA9698_BUFFER_SIZE]; - int res; - - res = pca9698_read40(addr, PCA9698_REG_OUTPUT, data); - if (res) - return res; - - pca9698_set_bit(gpio, data, value); - - return pca9698_write40(addr, PCA9698_REG_OUTPUT, data); -} |