drivers/power/power_i2c.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2011 Samsung Electronics
   4  * Lukasz Majewski <l.majewski@samsung.com>
   5  *
   6  * (C) Copyright 2010
   7  * Stefano Babic, DENX Software Engineering, sbabic@denx.de
   8  *
   9  * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
  10  * (C) Copyright 2019 NXP
  11  */
  12
  13 #include <common.h>
  14 #include <log.h>
  15 #include <linux/types.h>
  16 #include <power/pmic.h>
  17 #include <i2c.h>
  18 #include <linux/compiler.h>
  19
  20 int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
  21 {
  22         unsigned char buf[4] = { 0 };
  23
  24         if (check_reg(p, reg))
  25                 return -EINVAL;
  26 #if defined(CONFIG_DM_I2C)
  27         struct udevice *dev;
  28         int ret;
  29
  30         ret = i2c_get_chip_for_busnum(p->bus, pmic_i2c_addr,
  31                                       1, &dev);
  32         if (ret) {
  33                 printf("%s: Cannot find udev for a bus %d\n", __func__,
  34                        p->bus);
  35                 return -ENXIO;
  36         }
  37 #else /* Non DM I2C support - will be removed */
  38         I2C_SET_BUS(p->bus);
  39 #endif
  40
  41         switch (pmic_i2c_tx_num) {
  42         case 3:
  43                 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
  44                         buf[2] = (cpu_to_le32(val) >> 16) & 0xff;
  45                         buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
  46                         buf[0] = cpu_to_le32(val) & 0xff;
  47                 } else {
  48                         buf[0] = (cpu_to_le32(val) >> 16) & 0xff;
  49                         buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
  50                         buf[2] = cpu_to_le32(val) & 0xff;
  51                 }
  52                 break;
  53         case 2:
  54                 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
  55                         buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
  56                         buf[0] = cpu_to_le32(val) & 0xff;
  57                 } else {
  58                         buf[0] = (cpu_to_le32(val) >> 8) & 0xff;
  59                         buf[1] = cpu_to_le32(val) & 0xff;
  60                 }
  61                 break;
  62         case 1:
  63                 buf[0] = cpu_to_le32(val) & 0xff;
  64                 break;
  65         default:
  66                 printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
  67                 return -EINVAL;
  68         }
  69
  70 #if defined(CONFIG_DM_I2C)
  71         return dm_i2c_write(dev, reg, buf, pmic_i2c_tx_num);
  72 #else
  73         return i2c_write(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num);
  74 #endif
  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         int ret;
  82
  83         if (check_reg(p, reg))
  84                 return -EINVAL;
  85
  86 #if defined(CONFIG_DM_I2C)
  87         struct udevice *dev;
  88
  89         ret = i2c_get_chip_for_busnum(p->bus, pmic_i2c_addr,
  90                                       1, &dev);
  91         if (ret) {
  92                 printf("%s: Cannot find udev for a bus %d\n", __func__,
  93                        p->bus);
  94                 return -ENXIO;
  95         }
  96         ret = dm_i2c_read(dev, reg, buf, pmic_i2c_tx_num);
  97 #else /* Non DM I2C support - will be removed */
  98         I2C_SET_BUS(p->bus);
  99         ret = i2c_read(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num);
 100 #endif
 101         if (ret)
 102                 return ret;
 103
 104         switch (pmic_i2c_tx_num) {
 105         case 3:
 106                 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
 107                         ret_val = le32_to_cpu(buf[2] << 16
 108                                               | buf[1] << 8 | buf[0]);
 109                 else
 110                         ret_val = le32_to_cpu(buf[0] << 16 |
 111                                               buf[1] << 8 | buf[2]);
 112                 break;
 113         case 2:
 114                 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
 115                         ret_val = le32_to_cpu(buf[1] << 8 | buf[0]);
 116                 else
 117                         ret_val = le32_to_cpu(buf[0] << 8 | buf[1]);
 118                 break;
 119         case 1:
 120                 ret_val = le32_to_cpu(buf[0]);
 121                 break;
 122         default:
 123                 printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
 124                 return -EINVAL;
 125         }
 126         memcpy(val, &ret_val, sizeof(ret_val));
 127
 128         return 0;
 129 }
 130
 131 int pmic_probe(struct pmic *p)
 132 {
 133         debug("Bus: %d PMIC:%s probed!\n", p->bus, p->name);
 134 #if defined(CONFIG_DM_I2C)
 135         struct udevice *dev;
 136         int ret;
 137
 138         ret = i2c_get_chip_for_busnum(p->bus, pmic_i2c_addr,
 139                                       1, &dev);
 140         if (ret) {
 141                 printf("%s: Cannot find udev for a bus %d\n", __func__,
 142                        p->bus);
 143                 return -ENXIO;
 144         }
 145 #else /* Non DM I2C support - will be removed */
 146         i2c_set_bus_num(p->bus);
 147         if (i2c_probe(pmic_i2c_addr)) {
 148                 printf("Can't find PMIC:%s\n", p->name);
 149                 return -ENODEV;
 150         }
 151 #endif
 152
 153         return 0;
 154 }