drivers/power/power_i2c.c

   1 /*
   2  * Copyright (C) 2011 Samsung Electronics
   3  * Lukasz Majewski <l.majewski@samsung.com>
   4  *
   5  * (C) Copyright 2010
   6  * Stefano Babic, DENX Software Engineering, sbabic@denx.de
   7  *
   8  * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
   9  *
  10  * See file CREDITS for list of people who contributed to this
  11  * project.
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License as
  15  * published by the Free Software Foundation; either version 2 of
  16  * the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  26  * MA 02111-1307 USA
  27  */
  28
  29 #include <common.h>
  30 #include <linux/types.h>
  31 #include <power/pmic.h>
  32 #include <i2c.h>
  33 #include <compiler.h>
  34
  35 int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
  36 {
  37         unsigned char buf[4] = { 0 };
  38
  39         if (check_reg(p, reg))
  40                 return -1;
  41
  42         switch (pmic_i2c_tx_num) {
  43         case 3:
  44                 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
  45                         buf[2] = (cpu_to_le32(val) >> 16) & 0xff;
  46                         buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
  47                         buf[0] = cpu_to_le32(val) & 0xff;
  48                 } else {
  49                         buf[0] = (cpu_to_le32(val) >> 16) & 0xff;
  50                         buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
  51                         buf[2] = cpu_to_le32(val) & 0xff;
  52                 }
  53                 break;
  54         case 2:
  55                 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
  56                         buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
  57                         buf[0] = cpu_to_le32(val) & 0xff;
  58                 } else {
  59                         buf[0] = (cpu_to_le32(val) >> 8) & 0xff;
  60                         buf[1] = cpu_to_le32(val) & 0xff;
  61                 }
  62                 break;
  63         case 1:
  64                 buf[0] = cpu_to_le32(val) & 0xff;
  65                 break;
  66         default:
  67                 printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
  68                 return -1;
  69         }
  70
  71         if (i2c_write(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num))
  72                 return -1;
  73
  74         return 0;
  75 }
  76
  77 int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
  78 {
  79         unsigned char buf[4] = { 0 };
  80         u32 ret_val = 0;
  81
  82         if (check_reg(p, reg))
  83                 return -1;
  84
  85         if (i2c_read(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num))
  86                 return -1;
  87
  88         switch (pmic_i2c_tx_num) {
  89         case 3:
  90                 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
  91                         ret_val = le32_to_cpu(buf[2] << 16
  92                                               | buf[1] << 8 | buf[0]);
  93                 else
  94                         ret_val = le32_to_cpu(buf[0] << 16 |
  95                                               buf[1] << 8 | buf[2]);
  96                 break;
  97         case 2:
  98                 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
  99                         ret_val = le32_to_cpu(buf[1] << 8 | buf[0]);
 100                 else
 101                         ret_val = le32_to_cpu(buf[0] << 8 | buf[1]);
 102                 break;
 103         case 1:
 104                 ret_val = le32_to_cpu(buf[0]);
 105                 break;
 106         default:
 107                 printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
 108                 return -1;
 109         }
 110         memcpy(val, &ret_val, sizeof(ret_val));
 111
 112         return 0;
 113 }
 114
 115 int pmic_probe(struct pmic *p)
 116 {
 117         I2C_SET_BUS(p->bus);
 118         debug("Bus: %d PMIC:%s probed!\n", p->bus, p->name);
 119         if (i2c_probe(pmic_i2c_addr)) {
 120                 printf("Can't find PMIC:%s\n", p->name);
 121                 return -1;
 122         }
 123
 124         return 0;
 125 }