kernel/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 static 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
  45 static 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
  96 err_del_irq_chip:
  97         regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
  98         return ret;
  99 }
 100
 101 static 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
 112 static 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)
 122 static 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
 131 static 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
 141 static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,
 142                          intel_soc_pmic_resume);
 143
 144 static const struct i2c_device_id intel_soc_pmic_i2c_id[] = {
 145         { }
 146 };
 147 MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id);
 148
 149 #if defined(CONFIG_ACPI)
 150 static struct acpi_device_id intel_soc_pmic_acpi_match[] = {
 151         {"INT33FD", (kernel_ulong_t)&intel_soc_pmic_config_crc},
 152         { },
 153 };
 154 MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match);
 155 #endif
 156
 157 static 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
 170 module_i2c_driver(intel_soc_pmic_i2c_driver);
 171
 172 MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");
 173 MODULE_LICENSE("GPL v2");
 174 MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
 175 MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");