drivers/mfd/qcom-spmi-pmic.c

   1 /*
   2  * Copyright (c) 2014, The Linux Foundation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/spmi.h>
  17 #include <linux/regmap.h>
  18 #include <linux/of_platform.h>
  19
  20 #define PMIC_REV2               0x101
  21 #define PMIC_REV3               0x102
  22 #define PMIC_REV4               0x103
  23 #define PMIC_TYPE               0x104
  24 #define PMIC_SUBTYPE            0x105
  25
  26 #define PMIC_TYPE_VALUE         0x51
  27
  28 #define COMMON_SUBTYPE          0x00
  29 #define PM8941_SUBTYPE          0x01
  30 #define PM8841_SUBTYPE          0x02
  31 #define PM8019_SUBTYPE          0x03
  32 #define PM8226_SUBTYPE          0x04
  33 #define PM8110_SUBTYPE          0x05
  34 #define PMA8084_SUBTYPE         0x06
  35 #define PMI8962_SUBTYPE         0x07
  36 #define PMD9635_SUBTYPE         0x08
  37 #define PM8994_SUBTYPE          0x09
  38 #define PMI8994_SUBTYPE         0x0a
  39 #define PM8916_SUBTYPE          0x0b
  40 #define PM8004_SUBTYPE          0x0c
  41 #define PM8909_SUBTYPE          0x0d
  42 #define PM8998_SUBTYPE          0x14
  43 #define PMI8998_SUBTYPE         0x15
  44 #define PM8005_SUBTYPE          0x18
  45
  46 static const struct of_device_id pmic_spmi_id_table[] = {
  47         { .compatible = "qcom,spmi-pmic", .data = (void *)COMMON_SUBTYPE },
  48         { .compatible = "qcom,pm8941",    .data = (void *)PM8941_SUBTYPE },
  49         { .compatible = "qcom,pm8841",    .data = (void *)PM8841_SUBTYPE },
  50         { .compatible = "qcom,pm8019",    .data = (void *)PM8019_SUBTYPE },
  51         { .compatible = "qcom,pm8226",    .data = (void *)PM8226_SUBTYPE },
  52         { .compatible = "qcom,pm8110",    .data = (void *)PM8110_SUBTYPE },
  53         { .compatible = "qcom,pma8084",   .data = (void *)PMA8084_SUBTYPE },
  54         { .compatible = "qcom,pmi8962",   .data = (void *)PMI8962_SUBTYPE },
  55         { .compatible = "qcom,pmd9635",   .data = (void *)PMD9635_SUBTYPE },
  56         { .compatible = "qcom,pm8994",    .data = (void *)PM8994_SUBTYPE },
  57         { .compatible = "qcom,pmi8994",   .data = (void *)PMI8994_SUBTYPE },
  58         { .compatible = "qcom,pm8916",    .data = (void *)PM8916_SUBTYPE },
  59         { .compatible = "qcom,pm8004",    .data = (void *)PM8004_SUBTYPE },
  60         { .compatible = "qcom,pm8909",    .data = (void *)PM8909_SUBTYPE },
  61         { .compatible = "qcom,pm8998",    .data = (void *)PM8998_SUBTYPE },
  62         { .compatible = "qcom,pmi8998",   .data = (void *)PMI8998_SUBTYPE },
  63         { .compatible = "qcom,pm8005",    .data = (void *)PM8005_SUBTYPE },
  64         { }
  65 };
  66
  67 static void pmic_spmi_show_revid(struct regmap *map, struct device *dev)
  68 {
  69         unsigned int rev2, minor, major, type, subtype;
  70         const char *name = "unknown";
  71         int ret, i;
  72
  73         ret = regmap_read(map, PMIC_TYPE, &type);
  74         if (ret < 0)
  75                 return;
  76
  77         if (type != PMIC_TYPE_VALUE)
  78                 return;
  79
  80         ret = regmap_read(map, PMIC_SUBTYPE, &subtype);
  81         if (ret < 0)
  82                 return;
  83
  84         for (i = 0; i < ARRAY_SIZE(pmic_spmi_id_table); i++) {
  85                 if (subtype == (unsigned long)pmic_spmi_id_table[i].data)
  86                         break;
  87         }
  88
  89         if (i != ARRAY_SIZE(pmic_spmi_id_table))
  90                 name = pmic_spmi_id_table[i].compatible;
  91
  92         ret = regmap_read(map, PMIC_REV2, &rev2);
  93         if (ret < 0)
  94                 return;
  95
  96         ret = regmap_read(map, PMIC_REV3, &minor);
  97         if (ret < 0)
  98                 return;
  99
 100         ret = regmap_read(map, PMIC_REV4, &major);
 101         if (ret < 0)
 102                 return;
 103
 104         /*
 105          * In early versions of PM8941 and PM8226, the major revision number
 106          * started incrementing from 0 (eg 0 = v1.0, 1 = v2.0).
 107          * Increment the major revision number here if the chip is an early
 108          * version of PM8941 or PM8226.
 109          */
 110         if ((subtype == PM8941_SUBTYPE || subtype == PM8226_SUBTYPE) &&
 111             major < 0x02)
 112                 major++;
 113
 114         if (subtype == PM8110_SUBTYPE)
 115                 minor = rev2;
 116
 117         dev_dbg(dev, "%x: %s v%d.%d\n", subtype, name, major, minor);
 118 }
 119
 120 static const struct regmap_config spmi_regmap_config = {
 121         .reg_bits       = 16,
 122         .val_bits       = 8,
 123         .max_register   = 0xffff,
 124         .fast_io        = true,
 125 };
 126
 127 static int pmic_spmi_probe(struct spmi_device *sdev)
 128 {
 129         struct regmap *regmap;
 130
 131         regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config);
 132         if (IS_ERR(regmap))
 133                 return PTR_ERR(regmap);
 134
 135         /* Only the first slave id for a PMIC contains this information */
 136         if (sdev->usid % 2 == 0)
 137                 pmic_spmi_show_revid(regmap, &sdev->dev);
 138
 139         return devm_of_platform_populate(&sdev->dev);
 140 }
 141
 142 MODULE_DEVICE_TABLE(of, pmic_spmi_id_table);
 143
 144 static struct spmi_driver pmic_spmi_driver = {
 145         .probe = pmic_spmi_probe,
 146         .driver = {
 147                 .name = "pmic-spmi",
 148                 .of_match_table = pmic_spmi_id_table,
 149         },
 150 };
 151 module_spmi_driver(pmic_spmi_driver);
 152
 153 MODULE_DESCRIPTION("Qualcomm SPMI PMIC driver");
 154 MODULE_ALIAS("spmi:spmi-pmic");
 155 MODULE_LICENSE("GPL v2");
 156 MODULE_AUTHOR("Josh Cartwright <joshc@codeaurora.org>");
 157 MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");