thodg/cgminer/A1-trimpot-mcp4x.c

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• Hash : c1657499
  Author :
  Date : 2014-04-22T11:26:18
  

  A1: modularize board selector / add initial CCR support

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• A1-trimpot-mcp4x.c

• /*
   * support for MCP46x digital trimpot used in Bitmine's products
   *
   * 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 <assert.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 <sys/ioctl.h>
  
  #include <stdint.h>
  #include <stdbool.h>
  #include <fcntl.h>
  
  #include "miner.h"
  
  #include "A1-trimpot-mcp4x.h"
  
  
  static bool mcp4x_check_status(int file)
  {
  	union i2c_smbus_data data;
  	struct i2c_smbus_ioctl_data args;
  
  	args.read_write = I2C_SMBUS_READ;
  	args.command = ((5 & 0x0f) << 4) | 0x0c;
  	args.size = I2C_SMBUS_WORD_DATA;
  	args.data = &data;
  
  	return ioctl(file, I2C_SMBUS, &args) >= 0;
  }
  
  static uint16_t mcp4x_get_wiper(struct mcp4x *me, uint8_t id)
  {
  	assert(id < 2);
  	union i2c_smbus_data data;
  	struct i2c_smbus_ioctl_data args;
  
  	args.read_write = I2C_SMBUS_READ;
  	args.command = ((id & 0x0f) << 4) | 0x0c;
  	args.size = I2C_SMBUS_WORD_DATA;
  	args.data = &data;
  
  	if (ioctl(me->file, I2C_SMBUS, &args) < 0) {
  		applog(LOG_ERR, "Failed to read id %d: %s\n", id,
  		       strerror(errno));
  		return 0xffff;
  	}
  	return htobe16(data.word & 0xffff);
  }
  
  static bool mcp4x_set_wiper(struct mcp4x *me, uint8_t id, uint16_t w)
  {
  	assert(id < 2);
  	union i2c_smbus_data data;
  	data.word = w;
  
  	struct i2c_smbus_ioctl_data args;
  
  	args.read_write = I2C_SMBUS_WRITE;
  	args.command = (id & 0x0f) << 4;
  	args.size = I2C_SMBUS_WORD_DATA;
  	args.data = &data;
  
  	if (ioctl(me->file, I2C_SMBUS, &args) < 0) {
  		applog(LOG_ERR, "Failed to read id %d: %s\n", id,
  		       strerror(errno));
  		return false;
  	}
  	return me->get_wiper(me, id) == w;
  }
  
  void mcp4x_exit(struct mcp4x *me)
  {
  	close(me->file);
  	free(me);
  }
  
  struct mcp4x *mcp4x_init(uint8_t addr)
  {
  	struct mcp4x *me;
  	int file = open("/dev/i2c-1", O_RDWR);
  	if (file < 0) {
  		applog(LOG_INFO, "Failed to open i2c-1: %s\n", strerror(errno));
  		return NULL;
  	}
  
  	if (ioctl(file, I2C_SLAVE, addr) < 0)
  		return NULL;
  
  	if (!mcp4x_check_status(file))
  		return NULL;
  
  	me = malloc(sizeof(*me));
  	assert(me != NULL);
  
  	me->addr = addr;
  	me->file = file;
  	me->exit = mcp4x_exit;
  	me->get_wiper = mcp4x_get_wiper;
  	me->set_wiper = mcp4x_set_wiper;
  	return me;
  }
  
  

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