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 "intel_soc_pmic_core.h"
28
29static int intel_soc_pmic_find_gpio_irq(struct device *dev)
30{
31	struct gpio_desc *desc;
32	int irq;
33
34	desc = devm_gpiod_get_index(dev, "intel_soc_pmic", 0, GPIOD_IN);
35	if (IS_ERR(desc))
36		return PTR_ERR(desc);
37
38	irq = gpiod_to_irq(desc);
39	if (irq < 0)
40		dev_warn(dev, "Can't get irq: %d\n", irq);
41
42	return irq;
43}
44
45static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
46				    const struct i2c_device_id *i2c_id)
47{
48	struct device *dev = &i2c->dev;
49	const struct acpi_device_id *id;
50	struct intel_soc_pmic_config *config;
51	struct intel_soc_pmic *pmic;
52	int ret;
53	int irq;
54
55	id = acpi_match_device(dev->driver->acpi_match_table, dev);
56	if (!id || !id->driver_data)
57		return -ENODEV;
58
59	config = (struct intel_soc_pmic_config *)id->driver_data;
60
61	pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
62	if (!pmic)
63		return -ENOMEM;
64
65	dev_set_drvdata(dev, pmic);
66
67	pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
68
69	/*
70	 * On some boards the PMIC interrupt may come from a GPIO line. Try to
71	 * lookup the ACPI table for a such connection and setup a GPIO
72	 * interrupt if it exists. Otherwise use the IRQ provided by I2C
73	 */
74	irq = intel_soc_pmic_find_gpio_irq(dev);
75	pmic->irq = (irq < 0) ? i2c->irq : irq;
76
77	ret = regmap_add_irq_chip(pmic->regmap, pmic->irq,
78				  config->irq_flags | IRQF_ONESHOT,
79				  0, config->irq_chip,
80				  &pmic->irq_chip_data);
81	if (ret)
82		return ret;
83
84	ret = enable_irq_wake(pmic->irq);
85	if (ret)
86		dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
87
88	ret = mfd_add_devices(dev, -1, config->cell_dev,
89			      config->n_cell_devs, NULL, 0,
90			      regmap_irq_get_domain(pmic->irq_chip_data));
91	if (ret)
92		goto err_del_irq_chip;
93
94	return 0;
95
96err_del_irq_chip:
97	regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
98	return ret;
99}
100
101static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
102{
103	struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
104
105	regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
106
107	mfd_remove_devices(&i2c->dev);
108
109	return 0;
110}
111
112static void intel_soc_pmic_shutdown(struct i2c_client *i2c)
113{
114	struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
115
116	disable_irq(pmic->irq);
117
118	return;
119}
120
121#if defined(CONFIG_PM_SLEEP)
122static int intel_soc_pmic_suspend(struct device *dev)
123{
124	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
125
126	disable_irq(pmic->irq);
127
128	return 0;
129}
130
131static int intel_soc_pmic_resume(struct device *dev)
132{
133	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
134
135	enable_irq(pmic->irq);
136
137	return 0;
138}
139#endif
140
141static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,
142			 intel_soc_pmic_resume);
143
144static const struct i2c_device_id intel_soc_pmic_i2c_id[] = {
145	{ }
146};
147MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id);
148
149#if defined(CONFIG_ACPI)
150static struct acpi_device_id intel_soc_pmic_acpi_match[] = {
151	{"INT33FD", (kernel_ulong_t)&intel_soc_pmic_config_crc},
152	{ },
153};
154MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match);
155#endif
156
157static struct i2c_driver intel_soc_pmic_i2c_driver = {
158	.driver = {
159		.name = "intel_soc_pmic_i2c",
160		.owner = THIS_MODULE,
161		.pm = &intel_soc_pmic_pm_ops,
162		.acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match),
163	},
164	.probe = intel_soc_pmic_i2c_probe,
165	.remove = intel_soc_pmic_i2c_remove,
166	.id_table = intel_soc_pmic_i2c_id,
167	.shutdown = intel_soc_pmic_shutdown,
168};
169
170module_i2c_driver(intel_soc_pmic_i2c_driver);
171
172MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");
173MODULE_LICENSE("GPL v2");
174MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
175MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");
176