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
46static 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
67static 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
120static 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
127static 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
142MODULE_DEVICE_TABLE(of, pmic_spmi_id_table);
143
144static 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};
151module_spmi_driver(pmic_spmi_driver);
152
153MODULE_DESCRIPTION("Qualcomm SPMI PMIC driver");
154MODULE_ALIAS("spmi:spmi-pmic");
155MODULE_LICENSE("GPL v2");
156MODULE_AUTHOR("Josh Cartwright <joshc@codeaurora.org>");
157MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
158