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 <log.h>
  14 #include <linux/types.h>
  15 #include <power/pmic.h>
  16 #include <i2c.h>
  17 #include <linux/compiler.h>
  18
  19 int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
  20 {
  21         unsigned char buf[4] = { 0 };
  22
  23         if (check_reg(p, reg))
  24                 return -EINVAL;
  25 #if CONFIG_IS_ENABLED(DM_I2C)
  26         struct udevice *dev;
  27         int ret;
  28
  29         ret = i2c_get_chip_for_busnum(p->bus, pmic_i2c_addr,
  30                                       1, &dev);
  31         if (ret) {
  32                 printf("%s: Cannot find udev for a bus %d\n", __func__,
  33                        p->bus);
  34                 return -ENXIO;
  35         }
  36 #else /* Non DM I2C support - will be removed */
  37         I2C_SET_BUS(p->bus);
  38 #endif
  39
  40         switch (pmic_i2c_tx_num) {
  41         case 3:
  42                 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
  43                         buf[2] = (cpu_to_le32(val) >> 16) & 0xff;
  44                         buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
  45                         buf[0] = cpu_to_le32(val) & 0xff;
  46                 } else {
  47                         buf[0] = (cpu_to_le32(val) >> 16) & 0xff;
  48                         buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
  49                         buf[2] = cpu_to_le32(val) & 0xff;
  50                 }
  51                 break;
  52         case 2:
  53                 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
  54                         buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
  55                         buf[0] = cpu_to_le32(val) & 0xff;
  56                 } else {
  57                         buf[0] = (cpu_to_le32(val) >> 8) & 0xff;
  58                         buf[1] = cpu_to_le32(val) & 0xff;
  59                 }
  60                 break;
  61         case 1:
  62                 buf[0] = cpu_to_le32(val) & 0xff;
  63                 break;
  64         default:
  65                 printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
  66                 return -EINVAL;
  67         }
  68
  69 #if CONFIG_IS_ENABLED(DM_I2C)
  70         return dm_i2c_write(dev, reg, buf, pmic_i2c_tx_num);
  71 #else
  72         return i2c_write(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num);
  73 #endif
  74 }
  75
  76 int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
  77 {
  78         unsigned char buf[4] = { 0 };
  79         u32 ret_val = 0;
  80         int ret;
  81
  82         if (check_reg(p, reg))
  83                 return -EINVAL;
  84
  85 #if CONFIG_IS_ENABLED(DM_I2C)
  86         struct udevice *dev;
  87
  88         ret = i2c_get_chip_for_busnum(p->bus, pmic_i2c_addr,
  89                                       1, &dev);
  90         if (ret) {
  91                 printf("%s: Cannot find udev for a bus %d\n", __func__,
  92                        p->bus);
  93                 return -ENXIO;
  94         }
  95         ret = dm_i2c_read(dev, reg, buf, pmic_i2c_tx_num);
  96 #else /* Non DM I2C support - will be removed */
  97         I2C_SET_BUS(p->bus);
  98         ret = i2c_read(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num);
  99 #endif
 100         if (ret)
 101                 return ret;
 102
 103         switch (pmic_i2c_tx_num) {
 104         case 3:
 105                 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
 106                         ret_val = le32_to_cpu(buf[2] << 16
 107                                               | buf[1] << 8 | buf[0]);
 108                 else
 109                         ret_val = le32_to_cpu(buf[0] << 16 |
 110                                               buf[1] << 8 | buf[2]);
 111                 break;
 112         case 2:
 113                 if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
 114                         ret_val = le32_to_cpu(buf[1] << 8 | buf[0]);
 115                 else
 116                         ret_val = le32_to_cpu(buf[0] << 8 | buf[1]);
 117                 break;
 118         case 1:
 119                 ret_val = le32_to_cpu(buf[0]);
 120                 break;
 121         default:
 122                 printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
 123                 return -EINVAL;
 124         }
 125         memcpy(val, &ret_val, sizeof(ret_val));
 126
 127         return 0;
 128 }
 129
 130 int pmic_probe(struct pmic *p)
 131 {
 132         debug("Bus: %d PMIC:%s probed!\n", p->bus, p->name);
 133 #if CONFIG_IS_ENABLED(DM_I2C)
 134         struct udevice *dev;
 135         int ret;
 136
 137         ret = i2c_get_chip_for_busnum(p->bus, pmic_i2c_addr,
 138                                       1, &dev);
 139         if (ret) {
 140                 printf("%s: Cannot find udev for a bus %d\n", __func__,
 141                        p->bus);
 142                 return -ENXIO;
 143         }
 144 #else /* Non DM I2C support - will be removed */
 145         i2c_set_bus_num(p->bus);
 146         if (i2c_probe(pmic_i2c_addr)) {
 147                 printf("Can't find PMIC:%s\n", p->name);
 148                 return -ENODEV;
 149         }
 150 #endif
 151
 152         return 0;
 153 }