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 <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 */
  32 static 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
  42 /* PWM consumed by the Intel GFX */
  43 static struct pwm_lookup crc_pwm_lookup[] = {
  44         PWM_LOOKUP("crystal_cove_pwm", 0, "0000:00:02.0", "pwm_backlight", 0, PWM_POLARITY_NORMAL),
  45 };
  46
  47 static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
  48                                     const struct i2c_device_id *i2c_id)
  49 {
  50         struct device *dev = &i2c->dev;
  51         const struct acpi_device_id *id;
  52         struct intel_soc_pmic_config *config;
  53         struct intel_soc_pmic *pmic;
  54         int ret;
  55
  56         id = acpi_match_device(dev->driver->acpi_match_table, dev);
  57         if (!id || !id->driver_data)
  58                 return -ENODEV;
  59
  60         config = (struct intel_soc_pmic_config *)id->driver_data;
  61
  62         pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
  63         if (!pmic)
  64                 return -ENOMEM;
  65
  66         dev_set_drvdata(dev, pmic);
  67
  68         pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
  69         if (IS_ERR(pmic->regmap))
  70                 return PTR_ERR(pmic->regmap);
  71
  72         pmic->irq = i2c->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         /* Add lookup table binding for Panel Control to the GPIO Chip */
  86         gpiod_add_lookup_table(&panel_gpio_table);
  87
  88         /* Add lookup table for crc-pwm */
  89         pwm_add_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
  90
  91         ret = mfd_add_devices(dev, -1, config->cell_dev,
  92                               config->n_cell_devs, NULL, 0,
  93                               regmap_irq_get_domain(pmic->irq_chip_data));
  94         if (ret)
  95                 goto err_del_irq_chip;
  96
  97         return 0;
  98
  99 err_del_irq_chip:
 100         regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
 101         return ret;
 102 }
 103
 104 static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
 105 {
 106         struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
 107
 108         regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
 109
 110         /* Remove lookup table for Panel Control from the GPIO Chip */
 111         gpiod_remove_lookup_table(&panel_gpio_table);
 112
 113         /* remove crc-pwm lookup table */
 114         pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
 115
 116         mfd_remove_devices(&i2c->dev);
 117
 118         return 0;
 119 }
 120
 121 static void intel_soc_pmic_shutdown(struct i2c_client *i2c)
 122 {
 123         struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
 124
 125         disable_irq(pmic->irq);
 126
 127         return;
 128 }
 129
 130 #if defined(CONFIG_PM_SLEEP)
 131 static int intel_soc_pmic_suspend(struct device *dev)
 132 {
 133         struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 134
 135         disable_irq(pmic->irq);
 136
 137         return 0;
 138 }
 139
 140 static int intel_soc_pmic_resume(struct device *dev)
 141 {
 142         struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 143
 144         enable_irq(pmic->irq);
 145
 146         return 0;
 147 }
 148 #endif
 149
 150 static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,
 151                          intel_soc_pmic_resume);
 152
 153 static const struct i2c_device_id intel_soc_pmic_i2c_id[] = {
 154         { }
 155 };
 156 MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id);
 157
 158 #if defined(CONFIG_ACPI)
 159 static const struct acpi_device_id intel_soc_pmic_acpi_match[] = {
 160         {"INT33FD", (kernel_ulong_t)&intel_soc_pmic_config_crc},
 161         { },
 162 };
 163 MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match);
 164 #endif
 165
 166 static struct i2c_driver intel_soc_pmic_i2c_driver = {
 167         .driver = {
 168                 .name = "intel_soc_pmic_i2c",
 169                 .pm = &intel_soc_pmic_pm_ops,
 170                 .acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match),
 171         },
 172         .probe = intel_soc_pmic_i2c_probe,
 173         .remove = intel_soc_pmic_i2c_remove,
 174         .id_table = intel_soc_pmic_i2c_id,
 175         .shutdown = intel_soc_pmic_shutdown,
 176 };
 177
 178 module_i2c_driver(intel_soc_pmic_i2c_driver);
 179
 180 MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");
 181 MODULE_LICENSE("GPL v2");
 182 MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
 183 MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");