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>");