1/*
2 * intel_pmic_crc.c - Intel CrystalCove PMIC operation region driver
3 *
4 * Copyright (C) 2014 Intel Corporation. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 */
15
16#include <linux/module.h>
17#include <linux/acpi.h>
18#include <linux/mfd/intel_soc_pmic.h>
19#include <linux/regmap.h>
20#include <linux/platform_device.h>
21#include "intel_pmic.h"
22
23#define PWR_SOURCE_SELECT	BIT(1)
24
25#define PMIC_A0LOCK_REG		0xc5
26
27static struct pmic_table power_table[] = {
28	{
29		.address = 0x24,
30		.reg = 0x66,
31		.bit = 0x00,
32	},
33	{
34		.address = 0x48,
35		.reg = 0x5d,
36		.bit = 0x00,
37	},
38};
39
40static struct pmic_table thermal_table[] = {
41	{
42		.address = 0x00,
43		.reg = 0x75
44	},
45	{
46		.address = 0x04,
47		.reg = 0x95
48	},
49	{
50		.address = 0x08,
51		.reg = 0x97
52	},
53	{
54		.address = 0x0c,
55		.reg = 0x77
56	},
57	{
58		.address = 0x10,
59		.reg = 0x9a
60	},
61	{
62		.address = 0x14,
63		.reg = 0x9c
64	},
65	{
66		.address = 0x18,
67		.reg = 0x79
68	},
69	{
70		.address = 0x1c,
71		.reg = 0x9f
72	},
73	{
74		.address = 0x20,
75		.reg = 0xa1
76	},
77	{
78		.address = 0x48,
79		.reg = 0x94
80	},
81	{
82		.address = 0x4c,
83		.reg = 0x99
84	},
85	{
86		.address = 0x50,
87		.reg = 0x9e
88	},
89};
90
91static int intel_crc_pmic_get_power(struct regmap *regmap, int reg,
92				    int bit, u64 *value)
93{
94	int data;
95
96	if (regmap_read(regmap, reg, &data))
97		return -EIO;
98
99	*value = (data & PWR_SOURCE_SELECT) && (data & BIT(bit)) ? 1 : 0;
100	return 0;
101}
102
103static int intel_crc_pmic_update_power(struct regmap *regmap, int reg,
104				       int bit, bool on)
105{
106	int data;
107
108	if (regmap_read(regmap, reg, &data))
109		return -EIO;
110
111	if (on) {
112		data |= PWR_SOURCE_SELECT | BIT(bit);
113	} else {
114		data &= ~BIT(bit);
115		data |= PWR_SOURCE_SELECT;
116	}
117
118	if (regmap_write(regmap, reg, data))
119		return -EIO;
120	return 0;
121}
122
123static int intel_crc_pmic_get_raw_temp(struct regmap *regmap, int reg)
124{
125	int temp_l, temp_h;
126
127	/*
128	 * Raw temperature value is 10bits: 8bits in reg
129	 * and 2bits in reg-1: bit0,1
130	 */
131	if (regmap_read(regmap, reg, &temp_l) ||
132	    regmap_read(regmap, reg - 1, &temp_h))
133		return -EIO;
134
135	return temp_l | (temp_h & 0x3) << 8;
136}
137
138static int intel_crc_pmic_update_aux(struct regmap *regmap, int reg, int raw)
139{
140	return regmap_write(regmap, reg, raw) ||
141		regmap_update_bits(regmap, reg - 1, 0x3, raw >> 8) ? -EIO : 0;
142}
143
144static int intel_crc_pmic_get_policy(struct regmap *regmap, int reg, u64 *value)
145{
146	int pen;
147
148	if (regmap_read(regmap, reg, &pen))
149		return -EIO;
150	*value = pen >> 7;
151	return 0;
152}
153
154static int intel_crc_pmic_update_policy(struct regmap *regmap,
155					int reg, int enable)
156{
157	int alert0;
158
159	/* Update to policy enable bit requires unlocking a0lock */
160	if (regmap_read(regmap, PMIC_A0LOCK_REG, &alert0))
161		return -EIO;
162
163	if (regmap_update_bits(regmap, PMIC_A0LOCK_REG, 0x01, 0))
164		return -EIO;
165
166	if (regmap_update_bits(regmap, reg, 0x80, enable << 7))
167		return -EIO;
168
169	/* restore alert0 */
170	if (regmap_write(regmap, PMIC_A0LOCK_REG, alert0))
171		return -EIO;
172
173	return 0;
174}
175
176static struct intel_pmic_opregion_data intel_crc_pmic_opregion_data = {
177	.get_power	= intel_crc_pmic_get_power,
178	.update_power	= intel_crc_pmic_update_power,
179	.get_raw_temp	= intel_crc_pmic_get_raw_temp,
180	.update_aux	= intel_crc_pmic_update_aux,
181	.get_policy	= intel_crc_pmic_get_policy,
182	.update_policy	= intel_crc_pmic_update_policy,
183	.power_table	= power_table,
184	.power_table_count= ARRAY_SIZE(power_table),
185	.thermal_table	= thermal_table,
186	.thermal_table_count = ARRAY_SIZE(thermal_table),
187};
188
189static int intel_crc_pmic_opregion_probe(struct platform_device *pdev)
190{
191	struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
192	return intel_pmic_install_opregion_handler(&pdev->dev,
193			ACPI_HANDLE(pdev->dev.parent), pmic->regmap,
194			&intel_crc_pmic_opregion_data);
195}
196
197static struct platform_driver intel_crc_pmic_opregion_driver = {
198	.probe = intel_crc_pmic_opregion_probe,
199	.driver = {
200		.name = "crystal_cove_pmic",
201	},
202};
203
204static int __init intel_crc_pmic_opregion_driver_init(void)
205{
206	return platform_driver_register(&intel_crc_pmic_opregion_driver);
207}
208module_init(intel_crc_pmic_opregion_driver_init);
209
210MODULE_DESCRIPTION("CrystalCove ACPI operation region driver");
211MODULE_LICENSE("GPL");
212