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/init.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,
145					int reg, int bit, u64 *value)
146{
147	int pen;
148
149	if (regmap_read(regmap, reg, &pen))
150		return -EIO;
151	*value = pen >> 7;
152	return 0;
153}
154
155static int intel_crc_pmic_update_policy(struct regmap *regmap,
156					int reg, int bit, int enable)
157{
158	int alert0;
159
160	/* Update to policy enable bit requires unlocking a0lock */
161	if (regmap_read(regmap, PMIC_A0LOCK_REG, &alert0))
162		return -EIO;
163
164	if (regmap_update_bits(regmap, PMIC_A0LOCK_REG, 0x01, 0))
165		return -EIO;
166
167	if (regmap_update_bits(regmap, reg, 0x80, enable << 7))
168		return -EIO;
169
170	/* restore alert0 */
171	if (regmap_write(regmap, PMIC_A0LOCK_REG, alert0))
172		return -EIO;
173
174	return 0;
175}
176
177static struct intel_pmic_opregion_data intel_crc_pmic_opregion_data = {
178	.get_power	= intel_crc_pmic_get_power,
179	.update_power	= intel_crc_pmic_update_power,
180	.get_raw_temp	= intel_crc_pmic_get_raw_temp,
181	.update_aux	= intel_crc_pmic_update_aux,
182	.get_policy	= intel_crc_pmic_get_policy,
183	.update_policy	= intel_crc_pmic_update_policy,
184	.power_table	= power_table,
185	.power_table_count= ARRAY_SIZE(power_table),
186	.thermal_table	= thermal_table,
187	.thermal_table_count = ARRAY_SIZE(thermal_table),
188};
189
190static int intel_crc_pmic_opregion_probe(struct platform_device *pdev)
191{
192	struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
193	return intel_pmic_install_opregion_handler(&pdev->dev,
194			ACPI_HANDLE(pdev->dev.parent), pmic->regmap,
195			&intel_crc_pmic_opregion_data);
196}
197
198static struct platform_driver intel_crc_pmic_opregion_driver = {
199	.probe = intel_crc_pmic_opregion_probe,
200	.driver = {
201		.name = "crystal_cove_pmic",
202	},
203};
204builtin_platform_driver(intel_crc_pmic_opregion_driver);