drivers/mfd/intel_soc_pmic_core.c

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