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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/acpi.h>
20#include <linux/module.h>
21#include <linux/mfd/core.h>
22#include <linux/i2c.h>
23#include <linux/interrupt.h>
24#include <linux/gpio/consumer.h>
25#include <linux/acpi.h>
26#include <linux/regmap.h>
27#include <linux/mfd/intel_soc_pmic.h>
28#include <linux/gpio/machine.h>
29#include <linux/pwm.h>
30#include "intel_soc_pmic_core.h"
31
32/* Crystal Cove PMIC shares same ACPI ID between different platforms */
33#define BYT_CRC_HRV 2
34#define CHT_CRC_HRV 3
35
36/* Lookup table for the Panel Enable/Disable line as GPIO signals */
37static struct gpiod_lookup_table panel_gpio_table = {
38 /* Intel GFX is consumer */
39 .dev_id = "0000:00:02.0",
40 .table = {
41 /* Panel EN/DISABLE */
42 GPIO_LOOKUP("gpio_crystalcove", 94, "panel", GPIO_ACTIVE_HIGH),
43 { },
44 },
45};
46
47/* PWM consumed by the Intel GFX */
48static struct pwm_lookup crc_pwm_lookup[] = {
49 PWM_LOOKUP("crystal_cove_pwm", 0, "0000:00:02.0", "pwm_backlight", 0, PWM_POLARITY_NORMAL),
50};
51
52static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
53 const struct i2c_device_id *i2c_id)
54{
55 struct device *dev = &i2c->dev;
56 struct intel_soc_pmic_config *config;
57 struct intel_soc_pmic *pmic;
58 unsigned long long hrv;
59 acpi_status status;
60 int ret;
61
62 /*
63 * There are 2 different Crystal Cove PMICs a Bay Trail and Cherry
64 * Trail version, use _HRV to differentiate between the 2.
65 */
66 status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_HRV", NULL, &hrv);
67 if (ACPI_FAILURE(status)) {
68 dev_err(dev, "Failed to get PMIC hardware revision\n");
69 return -ENODEV;
70 }
71
72 switch (hrv) {
73 case BYT_CRC_HRV:
74 config = &intel_soc_pmic_config_byt_crc;
75 break;
76 case CHT_CRC_HRV:
77 config = &intel_soc_pmic_config_cht_crc;
78 break;
79 default:
80 dev_warn(dev, "Unknown hardware rev %llu, assuming BYT\n", hrv);
81 config = &intel_soc_pmic_config_byt_crc;
82 }
83
84 pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
85 if (!pmic)
86 return -ENOMEM;
87
88 dev_set_drvdata(dev, pmic);
89
90 pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
91 if (IS_ERR(pmic->regmap))
92 return PTR_ERR(pmic->regmap);
93
94 pmic->irq = i2c->irq;
95
96 ret = regmap_add_irq_chip(pmic->regmap, pmic->irq,
97 config->irq_flags | IRQF_ONESHOT,
98 0, config->irq_chip,
99 &pmic->irq_chip_data);
100 if (ret)
101 return ret;
102
103 ret = enable_irq_wake(pmic->irq);
104 if (ret)
105 dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
106
107 /* Add lookup table binding for Panel Control to the GPIO Chip */
108 gpiod_add_lookup_table(&panel_gpio_table);
109
110 /* Add lookup table for crc-pwm */
111 pwm_add_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
112
113 ret = mfd_add_devices(dev, -1, config->cell_dev,
114 config->n_cell_devs, NULL, 0,
115 regmap_irq_get_domain(pmic->irq_chip_data));
116 if (ret)
117 goto err_del_irq_chip;
118
119 return 0;
120
121err_del_irq_chip:
122 regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
123 return ret;
124}
125
126static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
127{
128 struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
129
130 regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
131
132 /* Remove lookup table for Panel Control from the GPIO Chip */
133 gpiod_remove_lookup_table(&panel_gpio_table);
134
135 /* remove crc-pwm lookup table */
136 pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
137
138 mfd_remove_devices(&i2c->dev);
139
140 return 0;
141}
142
143static void intel_soc_pmic_shutdown(struct i2c_client *i2c)
144{
145 struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
146
147 disable_irq(pmic->irq);
148
149 return;
150}
151
152#if defined(CONFIG_PM_SLEEP)
153static int intel_soc_pmic_suspend(struct device *dev)
154{
155 struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
156
157 disable_irq(pmic->irq);
158
159 return 0;
160}
161
162static int intel_soc_pmic_resume(struct device *dev)
163{
164 struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
165
166 enable_irq(pmic->irq);
167
168 return 0;
169}
170#endif
171
172static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,
173 intel_soc_pmic_resume);
174
175static const struct i2c_device_id intel_soc_pmic_i2c_id[] = {
176 { }
177};
178MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id);
179
180#if defined(CONFIG_ACPI)
181static const struct acpi_device_id intel_soc_pmic_acpi_match[] = {
182 { "INT33FD" },
183 { },
184};
185MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match);
186#endif
187
188static struct i2c_driver intel_soc_pmic_i2c_driver = {
189 .driver = {
190 .name = "intel_soc_pmic_i2c",
191 .pm = &intel_soc_pmic_pm_ops,
192 .acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match),
193 },
194 .probe = intel_soc_pmic_i2c_probe,
195 .remove = intel_soc_pmic_i2c_remove,
196 .id_table = intel_soc_pmic_i2c_id,
197 .shutdown = intel_soc_pmic_shutdown,
198};
199
200module_i2c_driver(intel_soc_pmic_i2c_driver);
201
202MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");
203MODULE_LICENSE("GPL v2");
204MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
205MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");