tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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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/* Lookup table for the Panel Enable/Disable line as GPIO signals */
32static struct gpiod_lookup_table panel_gpio_table = {
33 /* Intel GFX is consumer */
34 .dev_id = "0000:00:02.0",
35 .table = {
36 /* Panel EN/DISABLE */
37 GPIO_LOOKUP("gpio_crystalcove", 94, "panel", GPIO_ACTIVE_HIGH),
38 },
39};
40
41/* PWM consumed by the Intel GFX */
42static struct pwm_lookup crc_pwm_lookup[] = {
43 PWM_LOOKUP("crystal_cove_pwm", 0, "0000:00:02.0", "pwm_backlight", 0, PWM_POLARITY_NORMAL),
44};
45
46static int intel_soc_pmic_find_gpio_irq(struct device *dev)
47{
48 struct gpio_desc *desc;
49 int irq;
50
51 desc = devm_gpiod_get_index(dev, "intel_soc_pmic", 0, GPIOD_IN);
52 if (IS_ERR(desc))
53 return PTR_ERR(desc);
54
55 irq = gpiod_to_irq(desc);
56 if (irq < 0)
57 dev_warn(dev, "Can't get irq: %d\n", irq);
58
59 return irq;
60}
61
62static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
63 const struct i2c_device_id *i2c_id)
64{
65 struct device *dev = &i2c->dev;
66 const struct acpi_device_id *id;
67 struct intel_soc_pmic_config *config;
68 struct intel_soc_pmic *pmic;
69 int ret;
70 int irq;
71
72 id = acpi_match_device(dev->driver->acpi_match_table, dev);
73 if (!id || !id->driver_data)
74 return -ENODEV;
75
76 config = (struct intel_soc_pmic_config *)id->driver_data;
77
78 pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
79 if (!pmic)
80 return -ENOMEM;
81
82 dev_set_drvdata(dev, pmic);
83
84 pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
85
86 /*
87 * On some boards the PMIC interrupt may come from a GPIO line. Try to
88 * lookup the ACPI table for a such connection and setup a GPIO
89 * interrupt if it exists. Otherwise use the IRQ provided by I2C
90 */
91 irq = intel_soc_pmic_find_gpio_irq(dev);
92 pmic->irq = (irq < 0) ? i2c->irq : irq;
93
94 ret = regmap_add_irq_chip(pmic->regmap, pmic->irq,
95 config->irq_flags | IRQF_ONESHOT,
96 0, config->irq_chip,
97 &pmic->irq_chip_data);
98 if (ret)
99 return ret;
100
101 ret = enable_irq_wake(pmic->irq);
102 if (ret)
103 dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
104
105 /* Add lookup table binding for Panel Control to the GPIO Chip */
106 gpiod_add_lookup_table(&panel_gpio_table);
107
108 /* Add lookup table for crc-pwm */
109 pwm_add_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
110
111 ret = mfd_add_devices(dev, -1, config->cell_dev,
112 config->n_cell_devs, NULL, 0,
113 regmap_irq_get_domain(pmic->irq_chip_data));
114 if (ret)
115 goto err_del_irq_chip;
116
117 return 0;
118
119err_del_irq_chip:
120 regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
121 return ret;
122}
123
124static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
125{
126 struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
127
128 regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
129
130 /* Remove lookup table for Panel Control from the GPIO Chip */
131 gpiod_remove_lookup_table(&panel_gpio_table);
132
133 /* remove crc-pwm lookup table */
134 pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
135
136 mfd_remove_devices(&i2c->dev);
137
138 return 0;
139}
140
141static void intel_soc_pmic_shutdown(struct i2c_client *i2c)
142{
143 struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
144
145 disable_irq(pmic->irq);
146
147 return;
148}
149
150#if defined(CONFIG_PM_SLEEP)
151static int intel_soc_pmic_suspend(struct device *dev)
152{
153 struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
154
155 disable_irq(pmic->irq);
156
157 return 0;
158}
159
160static int intel_soc_pmic_resume(struct device *dev)
161{
162 struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
163
164 enable_irq(pmic->irq);
165
166 return 0;
167}
168#endif
169
170static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,
171 intel_soc_pmic_resume);
172
173static const struct i2c_device_id intel_soc_pmic_i2c_id[] = {
174 { }
175};
176MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id);
177
178#if defined(CONFIG_ACPI)
179static const struct acpi_device_id intel_soc_pmic_acpi_match[] = {
180 {"INT33FD", (kernel_ulong_t)&intel_soc_pmic_config_crc},
181 { },
182};
183MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match);
184#endif
185
186static struct i2c_driver intel_soc_pmic_i2c_driver = {
187 .driver = {
188 .name = "intel_soc_pmic_i2c",
189 .pm = &intel_soc_pmic_pm_ops,
190 .acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match),
191 },
192 .probe = intel_soc_pmic_i2c_probe,
193 .remove = intel_soc_pmic_i2c_remove,
194 .id_table = intel_soc_pmic_i2c_id,
195 .shutdown = intel_soc_pmic_shutdown,
196};
197
198module_i2c_driver(intel_soc_pmic_i2c_driver);
199
200MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");
201MODULE_LICENSE("GPL v2");
202MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
203MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");