lpbb.c

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    1 /*-
    2  * Copyright (c) 1998, 2001 Nicolas Souchu, Marc Bouget
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  *
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 /*
   33  * I2C Bit-Banging over parallel port
   34  *
   35  * See the Official Philips interface description in lpbb(4)
   36  */
   37 
   38 #include <sys/param.h>
   39 #include <sys/kernel.h>
   40 #include <sys/systm.h>
   41 #include <sys/module.h>
   42 #include <sys/bus.h>
   43 #include <sys/uio.h>
   44 
   45 
   46 #include <dev/ppbus/ppbconf.h>
   47 #include "ppbus_if.h"
   48 #include <dev/ppbus/ppbio.h>
   49 
   50 #include <dev/iicbus/iiconf.h>
   51 #include <dev/iicbus/iicbus.h>
   52 
   53 #include "iicbb_if.h"
   54 
   55 static int lpbb_detect(device_t dev);
   56 
   57 static void
   58 lpbb_identify(driver_t *driver, device_t parent)
   59 {
   60 
   61         device_t dev;
   62 
   63         dev = device_find_child(parent, "lpbb", 0);
   64         if (!dev)
   65                 BUS_ADD_CHILD(parent, 0, "lpbb", -1);
   66 }
   67 
   68 static int
   69 lpbb_probe(device_t dev)
   70 {
   71 
   72         /* Perhaps call this during identify instead? */
   73         if (!lpbb_detect(dev))
   74                 return (ENXIO);
   75 
   76         device_set_desc(dev, "Parallel I2C bit-banging interface");
   77 
   78         return (0);
   79 }
   80 
   81 static int
   82 lpbb_attach(device_t dev)
   83 {
   84         device_t bitbang;
   85         
   86         /* add generic bit-banging code */
   87         bitbang = device_add_child(dev, "iicbb", -1);
   88         device_probe_and_attach(bitbang);
   89 
   90         return (0);
   91 }
   92 
   93 static int
   94 lpbb_callback(device_t dev, int index, caddr_t *data)
   95 {
   96         device_t ppbus = device_get_parent(dev);
   97         int error = 0;
   98         int how;
   99 
  100         switch (index) {
  101         case IIC_REQUEST_BUS:
  102                 /* request the ppbus */
  103                 how = *(int *)data;
  104                 error = ppb_request_bus(ppbus, dev, how);
  105                 break;
  106 
  107         case IIC_RELEASE_BUS:
  108                 /* release the ppbus */
  109                 error = ppb_release_bus(ppbus, dev);
  110                 break;
  111 
  112         default:
  113                 error = EINVAL;
  114         }
  115 
  116         return (error);
  117 }
  118 
  119 #define SDA_out 0x80
  120 #define SCL_out 0x08
  121 #define SDA_in  0x80
  122 #define SCL_in  0x08
  123 #define ALIM    0x20
  124 #define I2CKEY  0x50
  125 
  126 static int lpbb_getscl(device_t dev)
  127 {
  128         return ((ppb_rstr(device_get_parent(dev)) & SCL_in) == SCL_in);
  129 }
  130 
  131 static int lpbb_getsda(device_t dev)
  132 {
  133         return ((ppb_rstr(device_get_parent(dev)) & SDA_in) == SDA_in);
  134 }
  135 
  136 static void lpbb_setsda(device_t dev, char val)
  137 {
  138         device_t ppbus = device_get_parent(dev);
  139 
  140         if(val==0)
  141                 ppb_wdtr(ppbus, (u_char)SDA_out);
  142         else                            
  143                 ppb_wdtr(ppbus, (u_char)~SDA_out);
  144 }
  145 
  146 static void lpbb_setscl(device_t dev, unsigned char val)
  147 {
  148         device_t ppbus = device_get_parent(dev);
  149 
  150         if(val==0)
  151                 ppb_wctr(ppbus, (u_char)(ppb_rctr(ppbus)&~SCL_out));
  152         else                                               
  153                 ppb_wctr(ppbus, (u_char)(ppb_rctr(ppbus)|SCL_out)); 
  154 }
  155 
  156 static int lpbb_detect(device_t dev)
  157 {
  158         device_t ppbus = device_get_parent(dev);
  159 
  160         if (ppb_request_bus(ppbus, dev, PPB_DONTWAIT)) {
  161                 device_printf(dev, "can't allocate ppbus\n");
  162                 return (0);
  163         }
  164 
  165         /* reset bus */
  166         lpbb_setsda(dev, 1);
  167         lpbb_setscl(dev, 1);
  168 
  169         if ((ppb_rstr(ppbus) & I2CKEY) ||
  170                 ((ppb_rstr(ppbus) & ALIM) != ALIM)) {
  171 
  172                 ppb_release_bus(ppbus, dev);
  173                 return (0);
  174         }
  175 
  176         ppb_release_bus(ppbus, dev);
  177 
  178         return (1);
  179 }
  180 
  181 static int
  182 lpbb_reset(device_t dev, u_char speed, u_char addr, u_char * oldaddr)
  183 {
  184         device_t ppbus = device_get_parent(dev);
  185 
  186         if (ppb_request_bus(ppbus, dev, PPB_DONTWAIT)) {
  187                 device_printf(dev, "can't allocate ppbus\n");
  188                 return (0);
  189         }
  190 
  191         /* reset bus */
  192         lpbb_setsda(dev, 1);
  193         lpbb_setscl(dev, 1);
  194 
  195         ppb_release_bus(ppbus, dev);
  196 
  197         return (IIC_ENOADDR);
  198 }
  199 
  200 static devclass_t lpbb_devclass;
  201 
  202 static device_method_t lpbb_methods[] = {
  203         /* device interface */
  204         DEVMETHOD(device_identify,      lpbb_identify),
  205         DEVMETHOD(device_probe,         lpbb_probe),
  206         DEVMETHOD(device_attach,        lpbb_attach),
  207 
  208         /* bus interface */
  209         DEVMETHOD(bus_print_child,      bus_generic_print_child),
  210 
  211         /* iicbb interface */
  212         DEVMETHOD(iicbb_callback,       lpbb_callback),
  213         DEVMETHOD(iicbb_setsda,         lpbb_setsda),
  214         DEVMETHOD(iicbb_setscl,         lpbb_setscl),
  215         DEVMETHOD(iicbb_getsda,         lpbb_getsda),
  216         DEVMETHOD(iicbb_getscl,         lpbb_getscl),
  217         DEVMETHOD(iicbb_reset,          lpbb_reset),
  218 
  219         { 0, 0 }
  220 };
  221 
  222 static driver_t lpbb_driver = {
  223         "lpbb",
  224         lpbb_methods,
  225         1,
  226 };
  227 
  228 DRIVER_MODULE(lpbb, ppbus, lpbb_driver, lpbb_devclass, 0, 0);
  229 MODULE_DEPEND(lpbb, ppbus, 1, 1, 1);
  230 MODULE_DEPEND(lpbb, iicbb, IICBB_MINVER, IICBB_PREFVER, IICBB_MAXVER);
  231 MODULE_VERSION(lpbb, 1);

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FreeBSD/Linux Kernel Cross Reference sys/dev/ppbus/lpbb.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/ppbus/lpbb.c