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/acpi.h>
  20 #include <linux/module.h>
  21 #include <linux/mfd/core.h>
  22 #include <linux/i2c.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/gpio/consumer.h>
  25 #include <linux/acpi.h>
  26 #include <linux/regmap.h>
  27 #include <linux/mfd/intel_soc_pmic.h>
  28 #include <linux/gpio/machine.h>
  29 #include <linux/pwm.h>
  30 #include "intel_soc_pmic_core.h"
  31
  32 /* Crystal Cove PMIC shares same ACPI ID between different platforms */
  33 #define BYT_CRC_HRV             2
  34 #define CHT_CRC_HRV             3
  35
  36 /* Lookup table for the Panel Enable/Disable line as GPIO signals */
  37 static struct gpiod_lookup_table panel_gpio_table = {
  38         /* Intel GFX is consumer */
  39         .dev_id = "0000:00:02.0",
  40         .table = {
  41                 /* Panel EN/DISABLE */
  42                 GPIO_LOOKUP("gpio_crystalcove", 94, "panel", GPIO_ACTIVE_HIGH),
  43                 { },
  44         },
  45 };
  46
  47 /* PWM consumed by the Intel GFX */
  48 static struct pwm_lookup crc_pwm_lookup[] = {
  49         PWM_LOOKUP("crystal_cove_pwm", 0, "0000:00:02.0", "pwm_backlight", 0, PWM_POLARITY_NORMAL),
  50 };
  51
  52 static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
  53                                     const struct i2c_device_id *i2c_id)
  54 {
  55         struct device *dev = &i2c->dev;
  56         struct intel_soc_pmic_config *config;
  57         struct intel_soc_pmic *pmic;
  58         unsigned long long hrv;
  59         acpi_status status;
  60         int ret;
  61
  62         /*
  63          * There are 2 different Crystal Cove PMICs a Bay Trail and Cherry
  64          * Trail version, use _HRV to differentiate between the 2.
  65          */
  66         status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_HRV", NULL, &hrv);
  67         if (ACPI_FAILURE(status)) {
  68                 dev_err(dev, "Failed to get PMIC hardware revision\n");
  69                 return -ENODEV;
  70         }
  71
  72         switch (hrv) {
  73         case BYT_CRC_HRV:
  74                 config = &intel_soc_pmic_config_byt_crc;
  75                 break;
  76         case CHT_CRC_HRV:
  77                 config = &intel_soc_pmic_config_cht_crc;
  78                 break;
  79         default:
  80                 dev_warn(dev, "Unknown hardware rev %llu, assuming BYT\n", hrv);
  81                 config = &intel_soc_pmic_config_byt_crc;
  82         }
  83
  84         pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
  85         if (!pmic)
  86                 return -ENOMEM;
  87
  88         dev_set_drvdata(dev, pmic);
  89
  90         pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
  91         if (IS_ERR(pmic->regmap))
  92                 return PTR_ERR(pmic->regmap);
  93
  94         pmic->irq = i2c->irq;
  95
  96         ret = regmap_add_irq_chip(pmic->regmap, pmic->irq,
  97                                   config->irq_flags | IRQF_ONESHOT,
  98                                   0, config->irq_chip,
  99                                   &pmic->irq_chip_data);
 100         if (ret)
 101                 return ret;
 102
 103         ret = enable_irq_wake(pmic->irq);
 104         if (ret)
 105                 dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
 106
 107         /* Add lookup table binding for Panel Control to the GPIO Chip */
 108         gpiod_add_lookup_table(&panel_gpio_table);
 109
 110         /* Add lookup table for crc-pwm */
 111         pwm_add_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
 112
 113         ret = mfd_add_devices(dev, -1, config->cell_dev,
 114                               config->n_cell_devs, NULL, 0,
 115                               regmap_irq_get_domain(pmic->irq_chip_data));
 116         if (ret)
 117                 goto err_del_irq_chip;
 118
 119         return 0;
 120
 121 err_del_irq_chip:
 122         regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
 123         return ret;
 124 }
 125
 126 static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
 127 {
 128         struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
 129
 130         regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
 131
 132         /* Remove lookup table for Panel Control from the GPIO Chip */
 133         gpiod_remove_lookup_table(&panel_gpio_table);
 134
 135         /* remove crc-pwm lookup table */
 136         pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
 137
 138         mfd_remove_devices(&i2c->dev);
 139
 140         return 0;
 141 }
 142
 143 static void intel_soc_pmic_shutdown(struct i2c_client *i2c)
 144 {
 145         struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
 146
 147         disable_irq(pmic->irq);
 148
 149         return;
 150 }
 151
 152 #if defined(CONFIG_PM_SLEEP)
 153 static int intel_soc_pmic_suspend(struct device *dev)
 154 {
 155         struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 156
 157         disable_irq(pmic->irq);
 158
 159         return 0;
 160 }
 161
 162 static int intel_soc_pmic_resume(struct device *dev)
 163 {
 164         struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 165
 166         enable_irq(pmic->irq);
 167
 168         return 0;
 169 }
 170 #endif
 171
 172 static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,
 173                          intel_soc_pmic_resume);
 174
 175 static const struct i2c_device_id intel_soc_pmic_i2c_id[] = {
 176         { }
 177 };
 178 MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id);
 179
 180 #if defined(CONFIG_ACPI)
 181 static const struct acpi_device_id intel_soc_pmic_acpi_match[] = {
 182         { "INT33FD" },
 183         { },
 184 };
 185 MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match);
 186 #endif
 187
 188 static struct i2c_driver intel_soc_pmic_i2c_driver = {
 189         .driver = {
 190                 .name = "intel_soc_pmic_i2c",
 191                 .pm = &intel_soc_pmic_pm_ops,
 192                 .acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match),
 193         },
 194         .probe = intel_soc_pmic_i2c_probe,
 195         .remove = intel_soc_pmic_i2c_remove,
 196         .id_table = intel_soc_pmic_i2c_id,
 197         .shutdown = intel_soc_pmic_shutdown,
 198 };
 199
 200 module_i2c_driver(intel_soc_pmic_i2c_driver);
 201
 202 MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");
 203 MODULE_LICENSE("GPL v2");
 204 MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
 205 MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");