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/*
* CHU - IO routines to CH375 from a Linux kernel module
* Copyright (C) 2026 Javier S. Pedro
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* 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, see <https://www.gnu.org/licenses/>.
*/
#ifndef CH375LNX_H
#define CH375LNX_H
#include <linux/types.h>
#include <linux/ioport.h>
#include <asm/io.h>
#define _Packed __attribute__ ((packed))
typedef enum {
false = 0,
true = 1
} bool;
#include <ch375.h>
struct ch375 {
uint16_t io_base;
uint16_t sec_size;
};
static inline uint8_t ch375_read_data(struct ch375 *dev)
{
return inb(dev->io_base + CH375_PORT_DATA);
}
static inline void ch375_write_data(struct ch375 *dev, uint8_t data)
{
outb(data, dev->io_base + CH375_PORT_DATA);
}
static inline void ch375_send_command(struct ch375 *dev, enum ch375_command cmd)
{
outb(cmd, dev->io_base + CH375_PORT_CMD);
}
/// True if interrupt line is currently active (i.e. low)
static inline bool ch375_poll_interrupt(struct ch375 *dev)
{
return !(inb(dev->io_base + CH375_PORT_CMD) & 0x80);
}
/** Reads one transfer block (64 bytes max). */
static uint8_t ch375_read_data_block(struct ch375 *dev, uint8_t *buffer)
{
uint8_t n = ch375_read_data(dev);
insb(dev->io_base + CH375_PORT_DATA, buffer, n);
return n;
}
static void ch375_write_data_block(struct ch375 *dev, uint8_t * buffer, uint8_t n)
{
ch375_write_data(dev, n);
outsb(dev->io_base + CH375_PORT_DATA, buffer, n);
}
#endif // CH375LNX_H
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