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_find_gpio_irq(struct device *dev)
  48 {
  49         struct gpio_desc *desc;
  50         int irq;
  51
  52         desc = devm_gpiod_get_index(dev, "intel_soc_pmic", 0, GPIOD_IN);
  53         if (IS_ERR(desc))
  54                 return PTR_ERR(desc);
  55
  56         irq = gpiod_to_irq(desc);
  57         if (irq < 0)
  58                 dev_warn(dev, "Can't get irq: %d\n", irq);
  59
  60         return irq;
  61 }
  62
  63 static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
  64                                     const struct i2c_device_id *i2c_id)
  65 {
  66         struct device *dev = &i2c->dev;
  67         const struct acpi_device_id *id;
  68         struct intel_soc_pmic_config *config;
  69         struct intel_soc_pmic *pmic;
  70         int ret;
  71         int irq;
  72
  73         id = acpi_match_device(dev->driver->acpi_match_table, dev);
  74         if (!id || !id->driver_data)
  75                 return -ENODEV;
  76
  77         config = (struct intel_soc_pmic_config *)id->driver_data;
  78
  79         pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
  80         if (!pmic)
  81                 return -ENOMEM;
  82
  83         dev_set_drvdata(dev, pmic);
  84
  85         pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
  86
  87         /*
  88          * On some boards the PMIC interrupt may come from a GPIO line. Try to
  89          * lookup the ACPI table for a such connection and setup a GPIO
  90          * interrupt if it exists. Otherwise use the IRQ provided by I2C
  91          */
  92         irq = intel_soc_pmic_find_gpio_irq(dev);
  93         pmic->irq = (irq < 0) ? i2c->irq : irq;
  94
  95         ret = regmap_add_irq_chip(pmic->regmap, pmic->irq,
  96                                   config->irq_flags | IRQF_ONESHOT,
  97                                   0, config->irq_chip,
  98                                   &pmic->irq_chip_data);
  99         if (ret)
 100                 return ret;
 101
 102         ret = enable_irq_wake(pmic->irq);
 103         if (ret)
 104                 dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
 105
 106         /* Add lookup table binding for Panel Control to the GPIO Chip */
 107         gpiod_add_lookup_table(&panel_gpio_table);
 108
 109         /* Add lookup table for crc-pwm */
 110         pwm_add_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
 111
 112         ret = mfd_add_devices(dev, -1, config->cell_dev,
 113                               config->n_cell_devs, NULL, 0,
 114                               regmap_irq_get_domain(pmic->irq_chip_data));
 115         if (ret)
 116                 goto err_del_irq_chip;
 117
 118         return 0;
 119
 120 err_del_irq_chip:
 121         regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
 122         return ret;
 123 }
 124
 125 static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
 126 {
 127         struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
 128
 129         regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
 130
 131         /* Remove lookup table for Panel Control from the GPIO Chip */
 132         gpiod_remove_lookup_table(&panel_gpio_table);
 133
 134         /* remove crc-pwm lookup table */
 135         pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
 136
 137         mfd_remove_devices(&i2c->dev);
 138
 139         return 0;
 140 }
 141
 142 static void intel_soc_pmic_shutdown(struct i2c_client *i2c)
 143 {
 144         struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
 145
 146         disable_irq(pmic->irq);
 147
 148         return;
 149 }
 150
 151 #if defined(CONFIG_PM_SLEEP)
 152 static int intel_soc_pmic_suspend(struct device *dev)
 153 {
 154         struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 155
 156         disable_irq(pmic->irq);
 157
 158         return 0;
 159 }
 160
 161 static int intel_soc_pmic_resume(struct device *dev)
 162 {
 163         struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 164
 165         enable_irq(pmic->irq);
 166
 167         return 0;
 168 }
 169 #endif
 170
 171 static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,
 172                          intel_soc_pmic_resume);
 173
 174 static const struct i2c_device_id intel_soc_pmic_i2c_id[] = {
 175         { }
 176 };
 177 MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id);
 178
 179 #if defined(CONFIG_ACPI)
 180 static const struct acpi_device_id intel_soc_pmic_acpi_match[] = {
 181         {"INT33FD", (kernel_ulong_t)&intel_soc_pmic_config_crc},
 182         { },
 183 };
 184 MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match);
 185 #endif
 186
 187 static struct i2c_driver intel_soc_pmic_i2c_driver = {
 188         .driver = {
 189                 .name = "intel_soc_pmic_i2c",
 190                 .pm = &intel_soc_pmic_pm_ops,
 191                 .acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match),
 192         },
 193         .probe = intel_soc_pmic_i2c_probe,
 194         .remove = intel_soc_pmic_i2c_remove,
 195         .id_table = intel_soc_pmic_i2c_id,
 196         .shutdown = intel_soc_pmic_shutdown,
 197 };
 198
 199 module_i2c_driver(intel_soc_pmic_i2c_driver);
 200
 201 MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");
 202 MODULE_LICENSE("GPL v2");
 203 MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
 204 MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");