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pca9548.c (2013B)

      1 /*
      2  * 
      3  * This license is set out in https://raw.githubusercontent.com/Broadcom-Network-Switching-Software/OpenBCM/master/Legal/LICENSE file.
      4  * 
      5  * Copyright 2007-2019 Broadcom Inc. All rights reserved.
      6  *
      7  * BCM56xx I2C Device Driver for Phillips PCA9548 i2c switch
      8  */
      9 
     10 #include <sal/types.h>
     11 #include <soc/debug.h>
     12 #include <soc/drv.h>
     13 #include <soc/error.h>
     14 #include <soc/i2c.h>
     15 #include <shared/bsl.h>
     16 
     17 STATIC int
     18 pca9548_read(int unit, int devno, uint16 addr, uint8* data, uint32* len)
     19 {
     20     
     21     int rv;
     22     uint8 saddr = soc_i2c_addr(unit, devno);
     23 
     24     rv = soc_i2c_read_byte(unit, saddr, data);
     25     *len = 1; /* Byte device */
     26     /* LOG_CLI((BSL_META_U(unit,
     27                            "sw%d: read 0x%x from sw at 0x%x\n"), devno, *data, saddr)); */
     28     soc_i2c_device(unit, devno)->rbyte++;   
     29     return rv;
     30 }
     31 
     32 /*
     33  * The data is what gets actually written to the channel selection
     34  * register. The channel must be converted to the appropriate bit
     35  * by the caller.
     36  */
     37 STATIC int
     38 pca9548_write(int unit, int devno, uint16 addr, uint8* data, uint32 len)
     39 {
     40     int rv;
     41     uint8 saddr = soc_i2c_addr(unit, devno);
     42 
     43     rv = soc_i2c_write_byte(unit, saddr, *data);
     44     /* LOG_CLI((BSL_META_U(unit,
     45                            "sw%d: wrote 0x%x to sw at 0x%x\n"), devno, *data, saddr)); */
     46     soc_i2c_device(unit, devno)->tbyte++;   
     47     return rv;
     48 }
     49 
     50 
     51 
     52 STATIC int
     53 pca9548_ioctl(int unit, int devno, int opcode, void* data, int len)
     54 {
     55     return SOC_E_NONE;
     56 }
     57 
     58 STATIC int
     59 pca9548_init(int unit, int devno, void* data, int len)
     60 {
     61 
     62     soc_i2c_devdesc_set(unit, devno, "PCA9548 i2c Switch");
     63     if (!SOC_IS_SHADOW(unit)) {
     64         /* enable channel 0 by default */
     65         return soc_i2c_write_byte(unit, soc_i2c_addr(unit, devno), 1);
     66     }
     67     return SOC_E_NONE;
     68 }
     69 
     70 
     71 /* PCA9548 Clock Chip Driver callout */
     72 i2c_driver_t _soc_i2c_pca9548_driver = {
     73     0x0, 0x0, /* System assigned bytes */
     74     PCA9548_DEVICE_TYPE,
     75     pca9548_read,
     76     pca9548_write,
     77     pca9548_ioctl,
     78     pca9548_init,
     79     NULL,
     80 };
     81