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