thodg/cgminer/i2c-context.c

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• Hash : 114f9fd2
  Author :
  Date : 2014-06-03T18:47:29
  

  A1: add support for updated product variants, small fixes This patch includes: * generalize I2C slave access * adapt CoinCraft Rig board selector to new design * add support for single chip chains * adapt verbosity levels * check for chip clocks below 100MHz

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• i2c-context.c

• /*
   * generic I2C slave access interface
   *
   * Copyright 2014 Zefir Kurtisi <zefir.kurtisi@gmail.com>
   *
   * 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.  See COPYING for more details.
   */
  
  
  #include <sys/ioctl.h>
  #include <errno.h>
  #include <string.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <linux/i2c.h>
  #include <linux/i2c-dev.h>
  
  #include <stdint.h>
  #include <stdbool.h>
  #include <fcntl.h>
  #include <assert.h>
  
  #include "miner.h"
  #include "i2c-context.h"
  
  
  static bool i2c_slave_write(struct i2c_ctx *ctx, uint8_t reg, uint8_t val)
  {
  	union i2c_smbus_data data;
  	data.byte = val;
  
  	struct i2c_smbus_ioctl_data args;
  
  	args.read_write = I2C_SMBUS_WRITE;
  	args.command = reg;
  	args.size = I2C_SMBUS_BYTE_DATA;
  	args.data = &data;
  
  	if (ioctl(ctx->file, I2C_SMBUS, &args) == -1) {
  		applog(LOG_INFO, "i2c 0x%02x: failed to write to fdesc %d: %s",
  		       ctx->addr, ctx->file, strerror(errno));
  		return false;
  	}
  	applog(LOG_DEBUG, "I2C-W(0x%02x/0x%02x)=0x%02x", ctx->addr, reg, val);
  	return true;
  }
  
  static bool i2c_slave_read(struct i2c_ctx *ctx, uint8_t reg, uint8_t *val)
  {
  	union i2c_smbus_data data;
  	struct i2c_smbus_ioctl_data args;
  
  	args.read_write = I2C_SMBUS_READ;
  	args.command = reg;
  	args.size = I2C_SMBUS_BYTE_DATA;
  	args.data = &data;
  
  	if (ioctl(ctx->file, I2C_SMBUS, &args) == -1) {
  		applog(LOG_INFO, "i2c 0x%02x: failed to read from fdesc %d: %s",
  		       ctx->addr, ctx->file, strerror(errno));
  		return false;
  	}
  	*val = data.byte;
  	applog(LOG_DEBUG, "I2C-R(0x%02x/0x%02x)=0x%02x", ctx->addr, reg, *val);
  	return true;
  }
  
  static void i2c_slave_exit(struct i2c_ctx *ctx)
  {
  	if (ctx->file == -1)
  		return;
  	close(ctx->file);
  	free(ctx);
  }
  
  extern struct i2c_ctx *i2c_slave_open(char *i2c_bus, uint8_t slave_addr)
  {
  	int file = open(i2c_bus, O_RDWR);
  	if (file < 0) {
  		applog(LOG_INFO, "Failed to open i2c-1: %s", strerror(errno));
  		return NULL;
  	}
  
  	if (ioctl(file, I2C_SLAVE, slave_addr) < 0) {
  		close(file);
  		return NULL;
  	}
  	struct i2c_ctx *ctx = malloc(sizeof(*ctx));
  	assert(ctx != NULL);
  
  	ctx->addr = slave_addr;
  	ctx->file = file;
  	ctx->exit = i2c_slave_exit;
  	ctx->read = i2c_slave_read;
  	ctx->write = i2c_slave_write;
  	return ctx;
  }
  
  

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