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Linux kernel mirror (for testing)
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linux
1/*
2 * intel_soc_pmic_core.c - Intel SoC PMIC MFD Driver
3 *
4 * Copyright (C) 2013, 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 * Author: Yang, Bin <bin.yang@intel.com>
16 * Author: Zhu, Lejun <lejun.zhu@linux.intel.com>
17 */
18
19#include <linux/module.h>
20#include <linux/mfd/core.h>
21#include <linux/i2c.h>
22#include <linux/interrupt.h>
23#include <linux/gpio/consumer.h>
24#include <linux/acpi.h>
25#include <linux/regmap.h>
26#include <linux/mfd/intel_soc_pmic.h>
27#include <linux/gpio/machine.h>
28#include <linux/pwm.h>
29#include "intel_soc_pmic_core.h"
30
31/* Crystal Cove PMIC shares same ACPI ID between different platforms */
32#define BYT_CRC_HRV 2
33#define CHT_CRC_HRV 3
34
35/* Lookup table for the Panel Enable/Disable line as GPIO signals */
36static struct gpiod_lookup_table panel_gpio_table = {
37 /* Intel GFX is consumer */
38 .dev_id = "0000:00:02.0",
39 .table = {
40 /* Panel EN/DISABLE */
41 GPIO_LOOKUP("gpio_crystalcove", 94, "panel", GPIO_ACTIVE_HIGH),
42 { },
43 },
44};
45
46/* PWM consumed by the Intel GFX */
47static struct pwm_lookup crc_pwm_lookup[] = {
48 PWM_LOOKUP("crystal_cove_pwm", 0, "0000:00:02.0", "pwm_backlight", 0, PWM_POLARITY_NORMAL),
49};
50
51static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
52 const struct i2c_device_id *i2c_id)
53{
54 struct device *dev = &i2c->dev;
55 struct intel_soc_pmic_config *config;
56 struct intel_soc_pmic *pmic;
57 unsigned long long hrv;
58 acpi_status status;
59 int ret;
60
61 /*
62 * There are 2 different Crystal Cove PMICs a Bay Trail and Cherry
63 * Trail version, use _HRV to differentiate between the 2.
64 */
65 status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_HRV", NULL, &hrv);
66 if (ACPI_FAILURE(status)) {
67 dev_err(dev, "Failed to get PMIC hardware revision\n");
68 return -ENODEV;
69 }
70
71 switch (hrv) {
72 case BYT_CRC_HRV:
73 config = &intel_soc_pmic_config_byt_crc;
74 break;
75 case CHT_CRC_HRV:
76 config = &intel_soc_pmic_config_cht_crc;
77 break;
78 default:
79 dev_warn(dev, "Unknown hardware rev %llu, assuming BYT\n", hrv);
80 config = &intel_soc_pmic_config_byt_crc;
81 }
82
83 pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
84 if (!pmic)
85 return -ENOMEM;
86
87 dev_set_drvdata(dev, pmic);
88
89 pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
90 if (IS_ERR(pmic->regmap))
91 return PTR_ERR(pmic->regmap);
92
93 pmic->irq = i2c->irq;
94
95 ret = regmap_add_irq_chip(pmic->regmap, pmic->irq,
96 config->irq_flags | IRQF_ONESHOT,
97 0, config->irq_chip,
98 &pmic->irq_chip_data);
99 if (ret)
100 return ret;
101
102 ret = enable_irq_wake(pmic->irq);
103 if (ret)
104 dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
105
106 /* Add lookup table binding for Panel Control to the GPIO Chip */
107 gpiod_add_lookup_table(&panel_gpio_table);
108
109 /* Add lookup table for crc-pwm */
110 pwm_add_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
111
112 ret = mfd_add_devices(dev, -1, config->cell_dev,
113 config->n_cell_devs, NULL, 0,
114 regmap_irq_get_domain(pmic->irq_chip_data));
115 if (ret)
116 goto err_del_irq_chip;
117
118 return 0;
119
120err_del_irq_chip:
121 regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
122 return ret;
123}
124
125static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
126{
127 struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
128
129 regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
130
131 /* Remove lookup table for Panel Control from the GPIO Chip */
132 gpiod_remove_lookup_table(&panel_gpio_table);
133
134 /* remove crc-pwm lookup table */
135 pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
136
137 mfd_remove_devices(&i2c->dev);
138
139 return 0;
140}
141
142static void intel_soc_pmic_shutdown(struct i2c_client *i2c)
143{
144 struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
145
146 disable_irq(pmic->irq);
147
148 return;
149}
150
151#if defined(CONFIG_PM_SLEEP)
152static int intel_soc_pmic_suspend(struct device *dev)
153{
154 struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
155
156 disable_irq(pmic->irq);
157
158 return 0;
159}
160
161static int intel_soc_pmic_resume(struct device *dev)
162{
163 struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
164
165 enable_irq(pmic->irq);
166
167 return 0;
168}
169#endif
170
171static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,
172 intel_soc_pmic_resume);
173
174static const struct i2c_device_id intel_soc_pmic_i2c_id[] = {
175 { }
176};
177MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id);
178
179#if defined(CONFIG_ACPI)
180static const struct acpi_device_id intel_soc_pmic_acpi_match[] = {
181 { "INT33FD" },
182 { },
183};
184MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match);
185#endif
186
187static struct i2c_driver intel_soc_pmic_i2c_driver = {
188 .driver = {
189 .name = "intel_soc_pmic_i2c",
190 .pm = &intel_soc_pmic_pm_ops,
191 .acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match),
192 },
193 .probe = intel_soc_pmic_i2c_probe,
194 .remove = intel_soc_pmic_i2c_remove,
195 .id_table = intel_soc_pmic_i2c_id,
196 .shutdown = intel_soc_pmic_shutdown,
197};
198
199module_i2c_driver(intel_soc_pmic_i2c_driver);
200
201MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");
202MODULE_LICENSE("GPL v2");
203MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
204MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");