54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
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//! \file i2c.c
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//! \author tkl
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//! \date Apr 26, 2012
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//! \brief Source file of the architecture independent i2c driver.
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#include <stddef.h>
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#include "i2c.h"
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int i2c_open(struct i2c *device)
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{
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if(device == NULL) {
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return -1;
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}
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i2c_fp_open_t open = device->fp->open;
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device->cnt_subscriber++;
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return open(device->arch_dep_device);
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}
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int i2c_close(struct i2c *device)
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{
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int ret = -1;
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if(device == NULL) {
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return -1;
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}
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i2c_fp_close_t close = device->fp->close;
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device->cnt_subscriber--;
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if(device->cnt_subscriber == 0)
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ret = close(device->arch_dep_device);
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else
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ret = 0; /* close only if all subscribers are gone. */
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return ret;
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}
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//-----------------------------------------------------------------------------
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int i2c_write(const struct i2c *device, char addr, const char *buffer,
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unsigned int len)
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{
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if(device == NULL) {
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return -1;
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}
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i2c_fp_write_t write = device->fp->write;
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return write(device->arch_dep_device, addr, buffer, len);
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}
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//-----------------------------------------------------------------------------
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int i2c_read(const struct i2c *device, char addr, char *buffer,
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unsigned int len)
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{
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if(device == NULL) {
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return -1;
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}
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i2c_fp_read_t read = device->fp->read;
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return read(device->arch_dep_device, addr, buffer, len);
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}
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