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
  43 static const struct of_device_id pmic_spmi_id_table[] = {
  44         { .compatible = "qcom,spmi-pmic", .data = (void *)COMMON_SUBTYPE },
  45         { .compatible = "qcom,pm8941",    .data = (void *)PM8941_SUBTYPE },
  46         { .compatible = "qcom,pm8841",    .data = (void *)PM8841_SUBTYPE },
  47         { .compatible = "qcom,pm8019",    .data = (void *)PM8019_SUBTYPE },
  48         { .compatible = "qcom,pm8226",    .data = (void *)PM8226_SUBTYPE },
  49         { .compatible = "qcom,pm8110",    .data = (void *)PM8110_SUBTYPE },
  50         { .compatible = "qcom,pma8084",   .data = (void *)PMA8084_SUBTYPE },
  51         { .compatible = "qcom,pmi8962",   .data = (void *)PMI8962_SUBTYPE },
  52         { .compatible = "qcom,pmd9635",   .data = (void *)PMD9635_SUBTYPE },
  53         { .compatible = "qcom,pm8994",    .data = (void *)PM8994_SUBTYPE },
  54         { .compatible = "qcom,pmi8994",   .data = (void *)PMI8994_SUBTYPE },
  55         { .compatible = "qcom,pm8916",    .data = (void *)PM8916_SUBTYPE },
  56         { .compatible = "qcom,pm8004",    .data = (void *)PM8004_SUBTYPE },
  57         { .compatible = "qcom,pm8909",    .data = (void *)PM8909_SUBTYPE },
  58         { }
  59 };
  60
  61 static void pmic_spmi_show_revid(struct regmap *map, struct device *dev)
  62 {
  63         unsigned int rev2, minor, major, type, subtype;
  64         const char *name = "unknown";
  65         int ret, i;
  66
  67         ret = regmap_read(map, PMIC_TYPE, &type);
  68         if (ret < 0)
  69                 return;
  70
  71         if (type != PMIC_TYPE_VALUE)
  72                 return;
  73
  74         ret = regmap_read(map, PMIC_SUBTYPE, &subtype);
  75         if (ret < 0)
  76                 return;
  77
  78         for (i = 0; i < ARRAY_SIZE(pmic_spmi_id_table); i++) {
  79                 if (subtype == (unsigned long)pmic_spmi_id_table[i].data)
  80                         break;
  81         }
  82
  83         if (i != ARRAY_SIZE(pmic_spmi_id_table))
  84                 name = pmic_spmi_id_table[i].compatible;
  85
  86         ret = regmap_read(map, PMIC_REV2, &rev2);
  87         if (ret < 0)
  88                 return;
  89
  90         ret = regmap_read(map, PMIC_REV3, &minor);
  91         if (ret < 0)
  92                 return;
  93
  94         ret = regmap_read(map, PMIC_REV4, &major);
  95         if (ret < 0)
  96                 return;
  97
  98         /*
  99          * In early versions of PM8941 and PM8226, the major revision number
 100          * started incrementing from 0 (eg 0 = v1.0, 1 = v2.0).
 101          * Increment the major revision number here if the chip is an early
 102          * version of PM8941 or PM8226.
 103          */
 104         if ((subtype == PM8941_SUBTYPE || subtype == PM8226_SUBTYPE) &&
 105             major < 0x02)
 106                 major++;
 107
 108         if (subtype == PM8110_SUBTYPE)
 109                 minor = rev2;
 110
 111         dev_dbg(dev, "%x: %s v%d.%d\n", subtype, name, major, minor);
 112 }
 113
 114 static const struct regmap_config spmi_regmap_config = {
 115         .reg_bits       = 16,
 116         .val_bits       = 8,
 117         .max_register   = 0xffff,
 118         .fast_io        = true,
 119 };
 120
 121 static int pmic_spmi_probe(struct spmi_device *sdev)
 122 {
 123         struct device_node *root = sdev->dev.of_node;
 124         struct regmap *regmap;
 125
 126         regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config);
 127         if (IS_ERR(regmap))
 128                 return PTR_ERR(regmap);
 129
 130         /* Only the first slave id for a PMIC contains this information */
 131         if (sdev->usid % 2 == 0)
 132                 pmic_spmi_show_revid(regmap, &sdev->dev);
 133
 134         return of_platform_populate(root, NULL, NULL, &sdev->dev);
 135 }
 136
 137 static void pmic_spmi_remove(struct spmi_device *sdev)
 138 {
 139         of_platform_depopulate(&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         .remove = pmic_spmi_remove,
 147         .driver = {
 148                 .name = "pmic-spmi",
 149                 .of_match_table = pmic_spmi_id_table,
 150         },
 151 };
 152 module_spmi_driver(pmic_spmi_driver);
 153
 154 MODULE_DESCRIPTION("Qualcomm SPMI PMIC driver");
 155 MODULE_ALIAS("spmi:spmi-pmic");
 156 MODULE_LICENSE("GPL v2");
 157 MODULE_AUTHOR("Josh Cartwright <joshc@codeaurora.org>");
 158 MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");