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	pmic_spmi_show_revid(regmap, &sdev->dev);
131
132	return of_platform_populate(root, NULL, NULL, &sdev->dev);
133}
134
135static void pmic_spmi_remove(struct spmi_device *sdev)
136{
137	of_platform_depopulate(&sdev->dev);
138}
139
140MODULE_DEVICE_TABLE(of, pmic_spmi_id_table);
141
142static struct spmi_driver pmic_spmi_driver = {
143	.probe = pmic_spmi_probe,
144	.remove = pmic_spmi_remove,
145	.driver = {
146		.name = "pmic-spmi",
147		.of_match_table = pmic_spmi_id_table,
148	},
149};
150module_spmi_driver(pmic_spmi_driver);
151
152MODULE_DESCRIPTION("Qualcomm SPMI PMIC driver");
153MODULE_ALIAS("spmi:spmi-pmic");
154MODULE_LICENSE("GPL v2");
155MODULE_AUTHOR("Josh Cartwright <joshc@codeaurora.org>");
156MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
157