thodg/cgminer/A1-board-selector-CCD.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-board-selector-CCD.c

• /*
   * board selector support for TCA9535 used in Bitmine's CoinCraft Desk
   *
   * 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 "miner.h"
  
  #include "A1-board-selector.h"
  
  static struct board_selector ccd_selector;
  
  struct ccd_ctx {
  	struct i2c_ctx U1_tca9535;
  	uint8_t board_mask;
  	uint8_t active_board;
  	pthread_mutex_t lock;
  };
  
  static struct ccd_ctx ccd_ctx = {
  	.U1_tca9535 = { .addr = 0x27, .file = -1 },
  	.board_mask = 0xff,
  	.active_board = 255,
  };
  
  #define UNUSED_BITS 0xe0
  
  static void ccd_unlock(void)
  {
  	mutex_unlock(&ccd_ctx.lock);
  }
  
  static void ccd_exit(void)
  {
  	i2c_slave_close(&ccd_ctx.U1_tca9535);
  }
  
  extern struct board_selector *ccd_board_selector_init(void)
  {
  	mutex_init(&ccd_ctx.lock);
  	struct i2c_ctx *ctx = &ccd_ctx.U1_tca9535;
  	bool retval =	i2c_slave_open(ctx, I2C_BUS) &&
  			i2c_slave_write(ctx, 0x06, 0xe0) &&
  			i2c_slave_write(ctx, 0x07, 0xe0) &&
  			i2c_slave_write(ctx, 0x02, 0x1f) &&
  			i2c_slave_write(ctx, 0x03, 0x00);
  	if (retval)
  		return &ccd_selector;
  	ccd_exit();
  	return NULL;
  }
  
  static bool ccd_select(uint8_t board)
  {
  	if (board >= CCD_MAX_CHAINS)
  		return false;
  
  	mutex_lock(&ccd_ctx.lock);
  	if (ccd_ctx.active_board == board)
  		return true;
  
  	ccd_ctx.active_board = board;
  	ccd_ctx.board_mask = 1 << ccd_ctx.active_board;
  	return i2c_slave_write(&ccd_ctx.U1_tca9535, 0x02, ~ccd_ctx.board_mask);
  }
  
  static bool __ccd_board_selector_reset(uint8_t mask)
  {
  	if (!i2c_slave_write(&ccd_ctx.U1_tca9535, 0x03, mask))
  		return false;
  	cgsleep_ms(RESET_LOW_TIME_MS);
  	if (!i2c_slave_write(&ccd_ctx.U1_tca9535, 0x03, 0x00))
  		return false;
  	cgsleep_ms(RESET_HI_TIME_MS);
  	return true;
  }
  // we assume we are already holding the mutex
  static bool ccd_reset(void)
  {
  	return __ccd_board_selector_reset(ccd_ctx.board_mask);
  }
  
  static bool ccd_reset_all(void)
  {
  	mutex_lock(&ccd_ctx.lock);
  	bool retval = __ccd_board_selector_reset(0xff & ~UNUSED_BITS);
  	mutex_unlock(&ccd_ctx.lock);
  	return retval;
  }
  
  
  static struct board_selector ccd_selector = {
  	.select = ccd_select,
  	.release = ccd_unlock,
  	.exit = ccd_exit,
  	.reset = ccd_reset,
  	.reset_all = ccd_reset_all,
  	.get_temp = dummy_u8,
  };
  
  

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