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 /* PWM consumed by the Intel GFX */
  42 static struct pwm_lookup crc_pwm_lookup[] = {
  43         PWM_LOOKUP("crystal_cove_pwm", 0, "0000:00:02.0", "pwm_backlight", 0, PWM_POLARITY_NORMAL),
  44 };
  45
  46 static int intel_soc_pmic_find_gpio_irq(struct device *dev)
  47 {
  48         struct gpio_desc *desc;
  49         int irq;
  50
  51         desc = devm_gpiod_get_index(dev, "intel_soc_pmic", 0, GPIOD_IN);
  52         if (IS_ERR(desc))
  53                 return PTR_ERR(desc);
  54
  55         irq = gpiod_to_irq(desc);
  56         if (irq < 0)
  57                 dev_warn(dev, "Can't get irq: %d\n", irq);
  58
  59         return irq;
  60 }
  61
  62 static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
  63                                     const struct i2c_device_id *i2c_id)
  64 {
  65         struct device *dev = &i2c->dev;
  66         const struct acpi_device_id *id;
  67         struct intel_soc_pmic_config *config;
  68         struct intel_soc_pmic *pmic;
  69         int ret;
  70         int irq;
  71
  72         id = acpi_match_device(dev->driver->acpi_match_table, dev);
  73         if (!id || !id->driver_data)
  74                 return -ENODEV;
  75
  76         config = (struct intel_soc_pmic_config *)id->driver_data;
  77
  78         pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
  79         if (!pmic)
  80                 return -ENOMEM;
  81
  82         dev_set_drvdata(dev, pmic);
  83
  84         pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
  85
  86         /*
  87          * On some boards the PMIC interrupt may come from a GPIO line. Try to
  88          * lookup the ACPI table for a such connection and setup a GPIO
  89          * interrupt if it exists. Otherwise use the IRQ provided by I2C
  90          */
  91         irq = intel_soc_pmic_find_gpio_irq(dev);
  92         pmic->irq = (irq < 0) ? i2c->irq : irq;
  93
  94         ret = regmap_add_irq_chip(pmic->regmap, pmic->irq,
  95                                   config->irq_flags | IRQF_ONESHOT,
  96                                   0, config->irq_chip,
  97                                   &pmic->irq_chip_data);
  98         if (ret)
  99                 return ret;
 100
 101         ret = enable_irq_wake(pmic->irq);
 102         if (ret)
 103                 dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
 104
 105         /* Add lookup table binding for Panel Control to the GPIO Chip */
 106         gpiod_add_lookup_table(&panel_gpio_table);
 107
 108         /* Add lookup table for crc-pwm */
 109         pwm_add_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
 110
 111         ret = mfd_add_devices(dev, -1, config->cell_dev,
 112                               config->n_cell_devs, NULL, 0,
 113                               regmap_irq_get_domain(pmic->irq_chip_data));
 114         if (ret)
 115                 goto err_del_irq_chip;
 116
 117         return 0;
 118
 119 err_del_irq_chip:
 120         regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
 121         return ret;
 122 }
 123
 124 static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
 125 {
 126         struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
 127
 128         regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
 129
 130         /* Remove lookup table for Panel Control from the GPIO Chip */
 131         gpiod_remove_lookup_table(&panel_gpio_table);
 132
 133         /* remove crc-pwm lookup table */
 134         pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
 135
 136         mfd_remove_devices(&i2c->dev);
 137
 138         return 0;
 139 }
 140
 141 static void intel_soc_pmic_shutdown(struct i2c_client *i2c)
 142 {
 143         struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
 144
 145         disable_irq(pmic->irq);
 146
 147         return;
 148 }
 149
 150 #if defined(CONFIG_PM_SLEEP)
 151 static int intel_soc_pmic_suspend(struct device *dev)
 152 {
 153         struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 154
 155         disable_irq(pmic->irq);
 156
 157         return 0;
 158 }
 159
 160 static int intel_soc_pmic_resume(struct device *dev)
 161 {
 162         struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 163
 164         enable_irq(pmic->irq);
 165
 166         return 0;
 167 }
 168 #endif
 169
 170 static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,
 171                          intel_soc_pmic_resume);
 172
 173 static const struct i2c_device_id intel_soc_pmic_i2c_id[] = {
 174         { }
 175 };
 176 MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id);
 177
 178 #if defined(CONFIG_ACPI)
 179 static const struct acpi_device_id intel_soc_pmic_acpi_match[] = {
 180         {"INT33FD", (kernel_ulong_t)&intel_soc_pmic_config_crc},
 181         { },
 182 };
 183 MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match);
 184 #endif
 185
 186 static struct i2c_driver intel_soc_pmic_i2c_driver = {
 187         .driver = {
 188                 .name = "intel_soc_pmic_i2c",
 189                 .pm = &intel_soc_pmic_pm_ops,
 190                 .acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match),
 191         },
 192         .probe = intel_soc_pmic_i2c_probe,
 193         .remove = intel_soc_pmic_i2c_remove,
 194         .id_table = intel_soc_pmic_i2c_id,
 195         .shutdown = intel_soc_pmic_shutdown,
 196 };
 197
 198 module_i2c_driver(intel_soc_pmic_i2c_driver);
 199
 200 MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");
 201 MODULE_LICENSE("GPL v2");
 202 MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
 203 MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");