drivers/mfd/intel_soc_pmic_core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Intel SoC PMIC MFD Driver
   4  *
   5  * Copyright (C) 2013, 2014 Intel Corporation. All rights reserved.
   6  *
   7  * Author: Yang, Bin <bin.yang@intel.com>
   8  * Author: Zhu, Lejun <lejun.zhu@linux.intel.com>
   9  */
  10
  11 #include <linux/acpi.h>
  12 #include <linux/i2c.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/module.h>
  15 #include <linux/mfd/core.h>
  16 #include <linux/mfd/intel_soc_pmic.h>
  17 #include <linux/pwm.h>
  18 #include <linux/regmap.h>
  19
  20 #include "intel_soc_pmic_core.h"
  21
  22 /* Crystal Cove PMIC shares same ACPI ID between different platforms */
  23 #define BYT_CRC_HRV             2
  24 #define CHT_CRC_HRV             3
  25
  26 /* PWM consumed by the Intel GFX */
  27 static struct pwm_lookup crc_pwm_lookup[] = {
  28         PWM_LOOKUP("crystal_cove_pwm", 0, "0000:00:02.0", "pwm_pmic_backlight", 0, PWM_POLARITY_NORMAL),
  29 };
  30
  31 static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
  32                                     const struct i2c_device_id *i2c_id)
  33 {
  34         struct device *dev = &i2c->dev;
  35         struct intel_soc_pmic_config *config;
  36         struct intel_soc_pmic *pmic;
  37         unsigned long long hrv;
  38         acpi_status status;
  39         int ret;
  40
  41         /*
  42          * There are 2 different Crystal Cove PMICs a Bay Trail and Cherry
  43          * Trail version, use _HRV to differentiate between the 2.
  44          */
  45         status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_HRV", NULL, &hrv);
  46         if (ACPI_FAILURE(status)) {
  47                 dev_err(dev, "Failed to get PMIC hardware revision\n");
  48                 return -ENODEV;
  49         }
  50
  51         switch (hrv) {
  52         case BYT_CRC_HRV:
  53                 config = &intel_soc_pmic_config_byt_crc;
  54                 break;
  55         case CHT_CRC_HRV:
  56                 config = &intel_soc_pmic_config_cht_crc;
  57                 break;
  58         default:
  59                 dev_warn(dev, "Unknown hardware rev %llu, assuming BYT\n", hrv);
  60                 config = &intel_soc_pmic_config_byt_crc;
  61         }
  62
  63         pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
  64         if (!pmic)
  65                 return -ENOMEM;
  66
  67         dev_set_drvdata(dev, pmic);
  68
  69         pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
  70         if (IS_ERR(pmic->regmap))
  71                 return PTR_ERR(pmic->regmap);
  72
  73         pmic->irq = i2c->irq;
  74
  75         ret = regmap_add_irq_chip(pmic->regmap, pmic->irq,
  76                                   config->irq_flags | IRQF_ONESHOT,
  77                                   0, config->irq_chip,
  78                                   &pmic->irq_chip_data);
  79         if (ret)
  80                 return ret;
  81
  82         ret = enable_irq_wake(pmic->irq);
  83         if (ret)
  84                 dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
  85
  86         /* Add lookup table for crc-pwm */
  87         pwm_add_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
  88
  89         ret = mfd_add_devices(dev, -1, config->cell_dev,
  90                               config->n_cell_devs, NULL, 0,
  91                               regmap_irq_get_domain(pmic->irq_chip_data));
  92         if (ret)
  93                 goto err_del_irq_chip;
  94
  95         return 0;
  96
  97 err_del_irq_chip:
  98         pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
  99         regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
 100         return ret;
 101 }
 102
 103 static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
 104 {
 105         struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
 106
 107         regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
 108
 109         /* remove crc-pwm lookup table */
 110         pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
 111
 112         mfd_remove_devices(&i2c->dev);
 113
 114         return 0;
 115 }
 116
 117 static void intel_soc_pmic_shutdown(struct i2c_client *i2c)
 118 {
 119         struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
 120
 121         disable_irq(pmic->irq);
 122
 123         return;
 124 }
 125
 126 #if defined(CONFIG_PM_SLEEP)
 127 static int intel_soc_pmic_suspend(struct device *dev)
 128 {
 129         struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 130
 131         disable_irq(pmic->irq);
 132
 133         return 0;
 134 }
 135
 136 static int intel_soc_pmic_resume(struct device *dev)
 137 {
 138         struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 139
 140         enable_irq(pmic->irq);
 141
 142         return 0;
 143 }
 144 #endif
 145
 146 static SIMPLE_DEV_PM_OPS(intel_soc_pmic_pm_ops, intel_soc_pmic_suspend,
 147                          intel_soc_pmic_resume);
 148
 149 static const struct i2c_device_id intel_soc_pmic_i2c_id[] = {
 150         { }
 151 };
 152 MODULE_DEVICE_TABLE(i2c, intel_soc_pmic_i2c_id);
 153
 154 #if defined(CONFIG_ACPI)
 155 static const struct acpi_device_id intel_soc_pmic_acpi_match[] = {
 156         { "INT33FD" },
 157         { },
 158 };
 159 MODULE_DEVICE_TABLE(acpi, intel_soc_pmic_acpi_match);
 160 #endif
 161
 162 static struct i2c_driver intel_soc_pmic_i2c_driver = {
 163         .driver = {
 164                 .name = "intel_soc_pmic_i2c",
 165                 .pm = &intel_soc_pmic_pm_ops,
 166                 .acpi_match_table = ACPI_PTR(intel_soc_pmic_acpi_match),
 167         },
 168         .probe = intel_soc_pmic_i2c_probe,
 169         .remove = intel_soc_pmic_i2c_remove,
 170         .id_table = intel_soc_pmic_i2c_id,
 171         .shutdown = intel_soc_pmic_shutdown,
 172 };
 173
 174 module_i2c_driver(intel_soc_pmic_i2c_driver);
 175
 176 MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");
 177 MODULE_LICENSE("GPL v2");
 178 MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
 179 MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");