drivers/mfd/max14577.c

   1 /*
   2  * max14577.c - mfd core driver for the Maxim 14577
   3  *
   4  * Copyright (C) 2013 Samsung Electrnoics
   5  * Chanwoo Choi <cw00.choi@samsung.com>
   6  * Krzysztof Kozlowski <k.kozlowski@samsung.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * This driver is based on max8997.c
  19  */
  20
  21 #include <linux/err.h>
  22 #include <linux/module.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/mfd/core.h>
  25 #include <linux/mfd/max14577.h>
  26 #include <linux/mfd/max14577-private.h>
  27
  28 static struct mfd_cell max14577_devs[] = {
  29         {
  30                 .name = "max14577-muic",
  31                 .of_compatible = "maxim,max14577-muic",
  32         },
  33         {
  34                 .name = "max14577-regulator",
  35                 .of_compatible = "maxim,max14577-regulator",
  36         },
  37         { .name = "max14577-charger", },
  38 };
  39
  40 static bool max14577_volatile_reg(struct device *dev, unsigned int reg)
  41 {
  42         switch (reg) {
  43         case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3:
  44                 return true;
  45         default:
  46                 break;
  47         }
  48         return false;
  49 }
  50
  51 static const struct regmap_config max14577_regmap_config = {
  52         .reg_bits       = 8,
  53         .val_bits       = 8,
  54         .volatile_reg   = max14577_volatile_reg,
  55         .max_register   = MAX14577_REG_END,
  56 };
  57
  58 static const struct regmap_irq max14577_irqs[] = {
  59         /* INT1 interrupts */
  60         { .reg_offset = 0, .mask = INT1_ADC_MASK, },
  61         { .reg_offset = 0, .mask = INT1_ADCLOW_MASK, },
  62         { .reg_offset = 0, .mask = INT1_ADCERR_MASK, },
  63         /* INT2 interrupts */
  64         { .reg_offset = 1, .mask = INT2_CHGTYP_MASK, },
  65         { .reg_offset = 1, .mask = INT2_CHGDETRUN_MASK, },
  66         { .reg_offset = 1, .mask = INT2_DCDTMR_MASK, },
  67         { .reg_offset = 1, .mask = INT2_DBCHG_MASK, },
  68         { .reg_offset = 1, .mask = INT2_VBVOLT_MASK, },
  69         /* INT3 interrupts */
  70         { .reg_offset = 2, .mask = INT3_EOC_MASK, },
  71         { .reg_offset = 2, .mask = INT3_CGMBC_MASK, },
  72         { .reg_offset = 2, .mask = INT3_OVP_MASK, },
  73         { .reg_offset = 2, .mask = INT3_MBCCHGERR_MASK, },
  74 };
  75
  76 static const struct regmap_irq_chip max14577_irq_chip = {
  77         .name                   = "max14577",
  78         .status_base            = MAX14577_REG_INT1,
  79         .mask_base              = MAX14577_REG_INTMASK1,
  80         .mask_invert            = 1,
  81         .num_regs               = 3,
  82         .irqs                   = max14577_irqs,
  83         .num_irqs               = ARRAY_SIZE(max14577_irqs),
  84 };
  85
  86 static int max14577_i2c_probe(struct i2c_client *i2c,
  87                               const struct i2c_device_id *id)
  88 {
  89         struct max14577 *max14577;
  90         struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);
  91         struct device_node *np = i2c->dev.of_node;
  92         u8 reg_data;
  93         int ret = 0;
  94
  95         if (np) {
  96                 pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
  97                 if (!pdata)
  98                         return -ENOMEM;
  99                 i2c->dev.platform_data = pdata;
 100         }
 101
 102         if (!pdata) {
 103                 dev_err(&i2c->dev, "No platform data found.\n");
 104                 return -EINVAL;
 105         }
 106
 107         max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);
 108         if (!max14577)
 109                 return -ENOMEM;
 110
 111         i2c_set_clientdata(i2c, max14577);
 112         max14577->dev = &i2c->dev;
 113         max14577->i2c = i2c;
 114         max14577->irq = i2c->irq;
 115
 116         max14577->regmap = devm_regmap_init_i2c(i2c, &max14577_regmap_config);
 117         if (IS_ERR(max14577->regmap)) {
 118                 ret = PTR_ERR(max14577->regmap);
 119                 dev_err(max14577->dev, "Failed to allocate register map: %d\n",
 120                                 ret);
 121                 return ret;
 122         }
 123
 124         ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,
 125                         &reg_data);
 126         if (ret) {
 127                 dev_err(max14577->dev, "Device not found on this channel: %d\n",
 128                                 ret);
 129                 return ret;
 130         }
 131         max14577->vendor_id = ((reg_data & DEVID_VENDORID_MASK) >>
 132                                 DEVID_VENDORID_SHIFT);
 133         max14577->device_id = ((reg_data & DEVID_DEVICEID_MASK) >>
 134                                 DEVID_DEVICEID_SHIFT);
 135         dev_info(max14577->dev, "Device ID: 0x%x, vendor: 0x%x\n",
 136                         max14577->device_id, max14577->vendor_id);
 137
 138         ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,
 139                                   IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 0,
 140                                   &max14577_irq_chip,
 141                                   &max14577->irq_data);
 142         if (ret != 0) {
 143                 dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
 144                                 max14577->irq, ret);
 145                 return ret;
 146         }
 147
 148         ret = mfd_add_devices(max14577->dev, -1, max14577_devs,
 149                         ARRAY_SIZE(max14577_devs), NULL, 0,
 150                         regmap_irq_get_domain(max14577->irq_data));
 151         if (ret < 0)
 152                 goto err_mfd;
 153
 154         device_init_wakeup(max14577->dev, 1);
 155
 156         return 0;
 157
 158 err_mfd:
 159         regmap_del_irq_chip(max14577->irq, max14577->irq_data);
 160
 161         return ret;
 162 }
 163
 164 static int max14577_i2c_remove(struct i2c_client *i2c)
 165 {
 166         struct max14577 *max14577 = i2c_get_clientdata(i2c);
 167
 168         mfd_remove_devices(max14577->dev);
 169         regmap_del_irq_chip(max14577->irq, max14577->irq_data);
 170
 171         return 0;
 172 }
 173
 174 static const struct i2c_device_id max14577_i2c_id[] = {
 175         { "max14577", 0 },
 176         { }
 177 };
 178 MODULE_DEVICE_TABLE(i2c, max14577_i2c_id);
 179
 180 #ifdef CONFIG_PM_SLEEP
 181 static int max14577_suspend(struct device *dev)
 182 {
 183         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 184         struct max14577 *max14577 = i2c_get_clientdata(i2c);
 185
 186         if (device_may_wakeup(dev)) {
 187                 enable_irq_wake(max14577->irq);
 188                 /*
 189                  * MUIC IRQ must be disabled during suspend if this is
 190                  * a wake up source because it will be handled before
 191                  * resuming I2C.
 192                  *
 193                  * When device is woken up from suspend (e.g. by ADC change),
 194                  * an interrupt occurs before resuming I2C bus controller.
 195                  * Interrupt handler tries to read registers but this read
 196                  * will fail because I2C is still suspended.
 197                  */
 198                 disable_irq(max14577->irq);
 199         }
 200
 201         return 0;
 202 }
 203
 204 static int max14577_resume(struct device *dev)
 205 {
 206         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 207         struct max14577 *max14577 = i2c_get_clientdata(i2c);
 208
 209         if (device_may_wakeup(dev)) {
 210                 disable_irq_wake(max14577->irq);
 211                 enable_irq(max14577->irq);
 212         }
 213
 214         return 0;
 215 }
 216 #endif /* CONFIG_PM_SLEEP */
 217
 218 static struct of_device_id max14577_dt_match[] = {
 219         { .compatible = "maxim,max14577", },
 220         {},
 221 };
 222
 223 static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume);
 224
 225 static struct i2c_driver max14577_i2c_driver = {
 226         .driver = {
 227                 .name = "max14577",
 228                 .owner = THIS_MODULE,
 229                 .pm = &max14577_pm,
 230                 .of_match_table = max14577_dt_match,
 231         },
 232         .probe = max14577_i2c_probe,
 233         .remove = max14577_i2c_remove,
 234         .id_table = max14577_i2c_id,
 235 };
 236
 237 static int __init max14577_i2c_init(void)
 238 {
 239         return i2c_add_driver(&max14577_i2c_driver);
 240 }
 241 subsys_initcall(max14577_i2c_init);
 242
 243 static void __exit max14577_i2c_exit(void)
 244 {
 245         i2c_del_driver(&max14577_i2c_driver);
 246 }
 247 module_exit(max14577_i2c_exit);
 248
 249 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>");
 250 MODULE_DESCRIPTION("MAXIM 14577 multi-function core driver");
 251 MODULE_LICENSE("GPL");