LXR linux/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
  43static 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
  61static 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
 114static 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
 121static 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
 137static void pmic_spmi_remove(struct spmi_device *sdev)
 138{
 139        of_platform_depopulate(&sdev->dev);
 140}
 141
 142MODULE_DEVICE_TABLE(of, pmic_spmi_id_table);
 143
 144static 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};
 152module_spmi_driver(pmic_spmi_driver);
 153
 154MODULE_DESCRIPTION("Qualcomm SPMI PMIC driver");
 155MODULE_ALIAS("spmi:spmi-pmic");
 156MODULE_LICENSE("GPL v2");
 157MODULE_AUTHOR("Josh Cartwright <joshc@codeaurora.org>");
 158MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
 159