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Linux/sound/soc/codecs/l3.c

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  1 /*
  2  * L3 code
  3  *
  4  *  Copyright (C) 2008, Christian Pellegrin <chripell@evolware.org>
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  *
 10  *
 11  * based on:
 12  *
 13  * L3 bus algorithm module.
 14  *
 15  *  Copyright (C) 2001 Russell King, All Rights Reserved.
 16  *
 17  *
 18  */
 19 
 20 #include <linux/module.h>
 21 #include <linux/kernel.h>
 22 #include <linux/delay.h>
 23 
 24 #include <sound/l3.h>
 25 
 26 /*
 27  * Send one byte of data to the chip.  Data is latched into the chip on
 28  * the rising edge of the clock.
 29  */
 30 static void sendbyte(struct l3_pins *adap, unsigned int byte)
 31 {
 32         int i;
 33 
 34         for (i = 0; i < 8; i++) {
 35                 adap->setclk(0);
 36                 udelay(adap->data_hold);
 37                 adap->setdat(byte & 1);
 38                 udelay(adap->data_setup);
 39                 adap->setclk(1);
 40                 udelay(adap->clock_high);
 41                 byte >>= 1;
 42         }
 43 }
 44 
 45 /*
 46  * Send a set of bytes to the chip.  We need to pulse the MODE line
 47  * between each byte, but never at the start nor at the end of the
 48  * transfer.
 49  */
 50 static void sendbytes(struct l3_pins *adap, const u8 *buf,
 51                       int len)
 52 {
 53         int i;
 54 
 55         for (i = 0; i < len; i++) {
 56                 if (i) {
 57                         udelay(adap->mode_hold);
 58                         adap->setmode(0);
 59                         udelay(adap->mode);
 60                 }
 61                 adap->setmode(1);
 62                 udelay(adap->mode_setup);
 63                 sendbyte(adap, buf[i]);
 64         }
 65 }
 66 
 67 int l3_write(struct l3_pins *adap, u8 addr, u8 *data, int len)
 68 {
 69         adap->setclk(1);
 70         adap->setdat(1);
 71         adap->setmode(1);
 72         udelay(adap->mode);
 73 
 74         adap->setmode(0);
 75         udelay(adap->mode_setup);
 76         sendbyte(adap, addr);
 77         udelay(adap->mode_hold);
 78 
 79         sendbytes(adap, data, len);
 80 
 81         adap->setclk(1);
 82         adap->setdat(1);
 83         adap->setmode(0);
 84 
 85         return len;
 86 }
 87 EXPORT_SYMBOL_GPL(l3_write);
 88 
 89 MODULE_DESCRIPTION("L3 bit-banging driver");
 90 MODULE_AUTHOR("Christian Pellegrin <chripell@evolware.org>");
 91 MODULE_LICENSE("GPL");
 92 

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