drivers/mfd/intel_soc_pmic_chtwc.c

   1 /*
   2  * MFD core driver for Intel Cherrytrail Whiskey Cove PMIC
   3  *
   4  * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
   5  *
   6  * Based on various non upstream patches to support the CHT Whiskey Cove PMIC:
   7  * Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/acpi.h>
  15 #include <linux/delay.h>
  16 #include <linux/err.h>
  17 #include <linux/i2c.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/kernel.h>
  20 #include <linux/mfd/core.h>
  21 #include <linux/mfd/intel_soc_pmic.h>
  22 #include <linux/regmap.h>
  23
  24 /* PMIC device registers */
  25 #define REG_OFFSET_MASK         GENMASK(7, 0)
  26 #define REG_ADDR_MASK           GENMASK(15, 8)
  27 #define REG_ADDR_SHIFT          8
  28
  29 #define CHT_WC_IRQLVL1          0x6e02
  30 #define CHT_WC_IRQLVL1_MASK     0x6e0e
  31
  32 /* Whiskey Cove PMIC share same ACPI ID between different platforms */
  33 #define CHT_WC_HRV              3
  34
  35 /* Level 1 IRQs (level 2 IRQs are handled in the child device drivers) */
  36 enum {
  37         CHT_WC_PWRSRC_IRQ = 0,
  38         CHT_WC_THRM_IRQ,
  39         CHT_WC_BCU_IRQ,
  40         CHT_WC_ADC_IRQ,
  41         CHT_WC_EXT_CHGR_IRQ,
  42         CHT_WC_GPIO_IRQ,
  43         /* There is no irq 6 */
  44         CHT_WC_CRIT_IRQ = 7,
  45 };
  46
  47 static struct resource cht_wc_pwrsrc_resources[] = {
  48         DEFINE_RES_IRQ(CHT_WC_PWRSRC_IRQ),
  49 };
  50
  51 static struct resource cht_wc_ext_charger_resources[] = {
  52         DEFINE_RES_IRQ(CHT_WC_EXT_CHGR_IRQ),
  53 };
  54
  55 static struct mfd_cell cht_wc_dev[] = {
  56         {
  57                 .name = "cht_wcove_pwrsrc",
  58                 .num_resources = ARRAY_SIZE(cht_wc_pwrsrc_resources),
  59                 .resources = cht_wc_pwrsrc_resources,
  60         }, {
  61                 .name = "cht_wcove_ext_chgr",
  62                 .num_resources = ARRAY_SIZE(cht_wc_ext_charger_resources),
  63                 .resources = cht_wc_ext_charger_resources,
  64         },
  65         {       .name = "cht_wcove_region", },
  66 };
  67
  68 /*
  69  * The CHT Whiskey Cove covers multiple I2C addresses, with a 1 Byte
  70  * register address space per I2C address, so we use 16 bit register
  71  * addresses where the high 8 bits contain the I2C client address.
  72  */
  73 static int cht_wc_byte_reg_read(void *context, unsigned int reg,
  74                                 unsigned int *val)
  75 {
  76         struct i2c_client *client = context;
  77         int ret, orig_addr = client->addr;
  78
  79         if (!(reg & REG_ADDR_MASK)) {
  80                 dev_err(&client->dev, "Error I2C address not specified\n");
  81                 return -EINVAL;
  82         }
  83
  84         client->addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT;
  85         ret = i2c_smbus_read_byte_data(client, reg & REG_OFFSET_MASK);
  86         client->addr = orig_addr;
  87
  88         if (ret < 0)
  89                 return ret;
  90
  91         *val = ret;
  92         return 0;
  93 }
  94
  95 static int cht_wc_byte_reg_write(void *context, unsigned int reg,
  96                                  unsigned int val)
  97 {
  98         struct i2c_client *client = context;
  99         int ret, orig_addr = client->addr;
 100
 101         if (!(reg & REG_ADDR_MASK)) {
 102                 dev_err(&client->dev, "Error I2C address not specified\n");
 103                 return -EINVAL;
 104         }
 105
 106         client->addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT;
 107         ret = i2c_smbus_write_byte_data(client, reg & REG_OFFSET_MASK, val);
 108         client->addr = orig_addr;
 109
 110         return ret;
 111 }
 112
 113 static const struct regmap_config cht_wc_regmap_cfg = {
 114         .reg_bits = 16,
 115         .val_bits = 8,
 116         .reg_write = cht_wc_byte_reg_write,
 117         .reg_read = cht_wc_byte_reg_read,
 118 };
 119
 120 static const struct regmap_irq cht_wc_regmap_irqs[] = {
 121         REGMAP_IRQ_REG(CHT_WC_PWRSRC_IRQ, 0, BIT(CHT_WC_PWRSRC_IRQ)),
 122         REGMAP_IRQ_REG(CHT_WC_THRM_IRQ, 0, BIT(CHT_WC_THRM_IRQ)),
 123         REGMAP_IRQ_REG(CHT_WC_BCU_IRQ, 0, BIT(CHT_WC_BCU_IRQ)),
 124         REGMAP_IRQ_REG(CHT_WC_ADC_IRQ, 0, BIT(CHT_WC_ADC_IRQ)),
 125         REGMAP_IRQ_REG(CHT_WC_EXT_CHGR_IRQ, 0, BIT(CHT_WC_EXT_CHGR_IRQ)),
 126         REGMAP_IRQ_REG(CHT_WC_GPIO_IRQ, 0, BIT(CHT_WC_GPIO_IRQ)),
 127         REGMAP_IRQ_REG(CHT_WC_CRIT_IRQ, 0, BIT(CHT_WC_CRIT_IRQ)),
 128 };
 129
 130 static const struct regmap_irq_chip cht_wc_regmap_irq_chip = {
 131         .name = "cht_wc_irq_chip",
 132         .status_base = CHT_WC_IRQLVL1,
 133         .mask_base = CHT_WC_IRQLVL1_MASK,
 134         .irqs = cht_wc_regmap_irqs,
 135         .num_irqs = ARRAY_SIZE(cht_wc_regmap_irqs),
 136         .num_regs = 1,
 137 };
 138
 139 static int cht_wc_probe(struct i2c_client *client)
 140 {
 141         struct device *dev = &client->dev;
 142         struct intel_soc_pmic *pmic;
 143         acpi_status status;
 144         unsigned long long hrv;
 145         int ret;
 146
 147         status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_HRV", NULL, &hrv);
 148         if (ACPI_FAILURE(status)) {
 149                 dev_err(dev, "Failed to get PMIC hardware revision\n");
 150                 return -ENODEV;
 151         }
 152         if (hrv != CHT_WC_HRV) {
 153                 dev_err(dev, "Invalid PMIC hardware revision: %llu\n", hrv);
 154                 return -ENODEV;
 155         }
 156         if (client->irq < 0) {
 157                 dev_err(dev, "Invalid IRQ\n");
 158                 return -EINVAL;
 159         }
 160
 161         pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
 162         if (!pmic)
 163                 return -ENOMEM;
 164
 165         pmic->irq = client->irq;
 166         pmic->dev = dev;
 167         i2c_set_clientdata(client, pmic);
 168
 169         pmic->regmap = devm_regmap_init(dev, NULL, client, &cht_wc_regmap_cfg);
 170         if (IS_ERR(pmic->regmap))
 171                 return PTR_ERR(pmic->regmap);
 172
 173         ret = devm_regmap_add_irq_chip(dev, pmic->regmap, pmic->irq,
 174                                        IRQF_ONESHOT | IRQF_SHARED, 0,
 175                                        &cht_wc_regmap_irq_chip,
 176                                        &pmic->irq_chip_data);
 177         if (ret)
 178                 return ret;
 179
 180         return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
 181                                 cht_wc_dev, ARRAY_SIZE(cht_wc_dev), NULL, 0,
 182                                 regmap_irq_get_domain(pmic->irq_chip_data));
 183 }
 184
 185 static void cht_wc_shutdown(struct i2c_client *client)
 186 {
 187         struct intel_soc_pmic *pmic = i2c_get_clientdata(client);
 188
 189         disable_irq(pmic->irq);
 190 }
 191
 192 static int __maybe_unused cht_wc_suspend(struct device *dev)
 193 {
 194         struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 195
 196         disable_irq(pmic->irq);
 197
 198         return 0;
 199 }
 200
 201 static int __maybe_unused cht_wc_resume(struct device *dev)
 202 {
 203         struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
 204
 205         enable_irq(pmic->irq);
 206
 207         return 0;
 208 }
 209 static SIMPLE_DEV_PM_OPS(cht_wc_pm_ops, cht_wc_suspend, cht_wc_resume);
 210
 211 static const struct i2c_device_id cht_wc_i2c_id[] = {
 212         { }
 213 };
 214
 215 static const struct acpi_device_id cht_wc_acpi_ids[] = {
 216         { "INT34D3", },
 217         { }
 218 };
 219
 220 static struct i2c_driver cht_wc_driver = {
 221         .driver = {
 222                 .name   = "CHT Whiskey Cove PMIC",
 223                 .pm     = &cht_wc_pm_ops,
 224                 .acpi_match_table = cht_wc_acpi_ids,
 225         },
 226         .probe_new = cht_wc_probe,
 227         .shutdown = cht_wc_shutdown,
 228         .id_table = cht_wc_i2c_id,
 229 };
 230 builtin_i2c_driver(cht_wc_driver);