tjh.dev
Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Intel SoC PMIC MFD Driver
4 *
5 * Copyright (C) 2013, 2014 Intel Corporation. All rights reserved.
6 *
7 * Author: Yang, Bin <bin.yang@intel.com>
8 * Author: Zhu, Lejun <lejun.zhu@linux.intel.com>
9 */
10
11#include <linux/acpi.h>
12#include <linux/i2c.h>
13#include <linux/interrupt.h>
14#include <linux/module.h>
15#include <linux/mfd/core.h>
16#include <linux/mfd/intel_soc_pmic.h>
17#include <linux/pwm.h>
18#include <linux/regmap.h>
19
20#include "intel_soc_pmic_core.h"
21
22/* Crystal Cove PMIC shares same ACPI ID between different platforms */
23#define BYT_CRC_HRV 2
24#define CHT_CRC_HRV 3
25
26/* PWM consumed by the Intel GFX */
27static struct pwm_lookup crc_pwm_lookup[] = {
28 PWM_LOOKUP("crystal_cove_pwm", 0, "0000:00:02.0", "pwm_pmic_backlight", 0, PWM_POLARITY_NORMAL),
29};
30
31static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
32 const struct i2c_device_id *i2c_id)
33{
34 struct device *dev = &i2c->dev;
35 struct intel_soc_pmic_config *config;
36 struct intel_soc_pmic *pmic;
37 unsigned long long hrv;
38 acpi_status status;
39 int ret;
40
41 /*
42 * There are 2 different Crystal Cove PMICs a Bay Trail and Cherry
43 * Trail version, use _HRV to differentiate between the 2.
44 */
45 status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_HRV", NULL, &hrv);
46 if (ACPI_FAILURE(status)) {
47 dev_err(dev, "Failed to get PMIC hardware revision\n");
48 return -ENODEV;
49 }
50
51 switch (hrv) {
52 case BYT_CRC_HRV:
53 config = &intel_soc_pmic_config_byt_crc;
54 break;
55 case CHT_CRC_HRV:
56 config = &intel_soc_pmic_config_cht_crc;
57 break;
58 default:
59 dev_warn(dev, "Unknown hardware rev %llu, assuming BYT\n", hrv);
60 config = &intel_soc_pmic_config_byt_crc;
61 }
62
63 pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
64 if (!pmic)
65 return -ENOMEM;
66
67 dev_set_drvdata(dev, pmic);
68
69 pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
70 if (IS_ERR(pmic->regmap))
71 return PTR_ERR(pmic->regmap);
72
73 pmic->irq = i2c->irq;
74
75 ret = regmap_add_irq_chip(pmic->regmap, pmic->irq,
76 config->irq_flags | IRQF_ONESHOT,
77 0, config->irq_chip,
78 &pmic->irq_chip_data);
79 if (ret)
80 return ret;
81
82 ret = enable_irq_wake(pmic->irq);
83 if (ret)
84 dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
85
86 /* Add lookup table for crc-pwm */
87 pwm_add_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
88
89 ret = mfd_add_devices(dev, -1, config->cell_dev,
90 config->n_cell_devs, NULL, 0,
91 regmap_irq_get_domain(pmic->irq_chip_data));
92 if (ret)
93 goto err_del_irq_chip;
94
95 return 0;
96
97err_del_irq_chip:
98 regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
99 return ret;
100}
101
102static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
103{
104 struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
105
106 regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
107
108 /* remove crc-pwm lookup table */
109 pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
110
111 mfd_remove_devices(&i2c->dev);
112
113 return 0;
114}
115
116static void intel_soc_pmic_shutdown(struct i2c_client *i2c)
117{
118 struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
119
120 disable_irq(pmic->irq);
121
122 return;
123}
124
125#if defined(CONFIG_PM_SLEEP)
126static int intel_soc_pmic_suspend(struct device *dev)
127{
128 struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
129
130 disable_irq(pmic->irq);
131
132 return 0;
133}
134
135static int intel_soc_pmic_resume(struct device *dev)
136{
137 struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
138
139 enable_irq(pmic->irq);
140
141 return 0;
142}
143#endif
144
145static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,
146 intel_soc_pmic_resume);
147
148static const struct i2c_device_id intel_soc_pmic_i2c_id[] = {
149 { }
150};
151MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id);
152
153#if defined(CONFIG_ACPI)
154static const struct acpi_device_id intel_soc_pmic_acpi_match[] = {
155 { "INT33FD" },
156 { },
157};
158MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match);
159#endif
160
161static struct i2c_driver intel_soc_pmic_i2c_driver = {
162 .driver = {
163 .name = "intel_soc_pmic_i2c",
164 .pm = &intel_soc_pmic_pm_ops,
165 .acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match),
166 },
167 .probe = intel_soc_pmic_i2c_probe,
168 .remove = intel_soc_pmic_i2c_remove,
169 .id_table = intel_soc_pmic_i2c_id,
170 .shutdown = intel_soc_pmic_shutdown,
171};
172
173module_i2c_driver(intel_soc_pmic_i2c_driver);
174
175MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");
176MODULE_LICENSE("GPL v2");
177MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
178MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");