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/module.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/mfd/core.h>
  24 #include <linux/mfd/max14577.h>
  25 #include <linux/mfd/max14577-private.h>
  26
  27 static struct mfd_cell max14577_devs[] = {
  28         { .name = "max14577-muic", },
  29         {
  30                 .name = "max14577-regulator",
  31                 .of_compatible = "maxim,max14577-regulator",
  32         },
  33         { .name = "max14577-charger", },
  34 };
  35
  36 static bool max14577_volatile_reg(struct device *dev, unsigned int reg)
  37 {
  38         switch (reg) {
  39         case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3:
  40                 return true;
  41         default:
  42                 break;
  43         }
  44         return false;
  45 }
  46
  47 static const struct regmap_config max14577_regmap_config = {
  48         .reg_bits       = 8,
  49         .val_bits       = 8,
  50         .volatile_reg   = max14577_volatile_reg,
  51         .max_register   = MAX14577_REG_END,
  52 };
  53
  54 static const struct regmap_irq max14577_irqs[] = {
  55         /* INT1 interrupts */
  56         { .reg_offset = 0, .mask = INT1_ADC_MASK, },
  57         { .reg_offset = 0, .mask = INT1_ADCLOW_MASK, },
  58         { .reg_offset = 0, .mask = INT1_ADCERR_MASK, },
  59         /* INT2 interrupts */
  60         { .reg_offset = 1, .mask = INT2_CHGTYP_MASK, },
  61         { .reg_offset = 1, .mask = INT2_CHGDETRUN_MASK, },
  62         { .reg_offset = 1, .mask = INT2_DCDTMR_MASK, },
  63         { .reg_offset = 1, .mask = INT2_DBCHG_MASK, },
  64         { .reg_offset = 1, .mask = INT2_VBVOLT_MASK, },
  65         /* INT3 interrupts */
  66         { .reg_offset = 2, .mask = INT3_EOC_MASK, },
  67         { .reg_offset = 2, .mask = INT3_CGMBC_MASK, },
  68         { .reg_offset = 2, .mask = INT3_OVP_MASK, },
  69         { .reg_offset = 2, .mask = INT3_MBCCHGERR_MASK, },
  70 };
  71
  72 static const struct regmap_irq_chip max14577_irq_chip = {
  73         .name                   = "max14577",
  74         .status_base            = MAX14577_REG_INT1,
  75         .mask_base              = MAX14577_REG_INTMASK1,
  76         .mask_invert            = 1,
  77         .num_regs               = 3,
  78         .irqs                   = max14577_irqs,
  79         .num_irqs               = ARRAY_SIZE(max14577_irqs),
  80 };
  81
  82 static int max14577_i2c_probe(struct i2c_client *i2c,
  83                               const struct i2c_device_id *id)
  84 {
  85         struct max14577 *max14577;
  86         struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);
  87         struct device_node *np = i2c->dev.of_node;
  88         u8 reg_data;
  89         int ret = 0;
  90
  91         if (np) {
  92                 pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
  93                 if (!pdata)
  94                         return -ENOMEM;
  95                 i2c->dev.platform_data = pdata;
  96         }
  97
  98         if (!pdata) {
  99                 dev_err(&i2c->dev, "No platform data found.\n");
 100                 return -EINVAL;
 101         }
 102
 103         max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);
 104         if (!max14577)
 105                 return -ENOMEM;
 106
 107         i2c_set_clientdata(i2c, max14577);
 108         max14577->dev = &i2c->dev;
 109         max14577->i2c = i2c;
 110         max14577->irq = i2c->irq;
 111
 112         max14577->regmap = devm_regmap_init_i2c(i2c, &max14577_regmap_config);
 113         if (IS_ERR(max14577->regmap)) {
 114                 ret = PTR_ERR(max14577->regmap);
 115                 dev_err(max14577->dev, "Failed to allocate register map: %d\n",
 116                                 ret);
 117                 return ret;
 118         }
 119
 120         ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,
 121                         &reg_data);
 122         if (ret) {
 123                 dev_err(max14577->dev, "Device not found on this channel: %d\n",
 124                                 ret);
 125                 return ret;
 126         }
 127         max14577->vendor_id = ((reg_data & DEVID_VENDORID_MASK) >>
 128                                 DEVID_VENDORID_SHIFT);
 129         max14577->device_id = ((reg_data & DEVID_DEVICEID_MASK) >>
 130                                 DEVID_DEVICEID_SHIFT);
 131         dev_info(max14577->dev, "Device ID: 0x%x, vendor: 0x%x\n",
 132                         max14577->device_id, max14577->vendor_id);
 133
 134         ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,
 135                                   IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 0,
 136                                   &max14577_irq_chip,
 137                                   &max14577->irq_data);
 138         if (ret != 0) {
 139                 dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
 140                                 max14577->irq, ret);
 141                 return ret;
 142         }
 143
 144         ret = mfd_add_devices(max14577->dev, -1, max14577_devs,
 145                         ARRAY_SIZE(max14577_devs), NULL, 0,
 146                         regmap_irq_get_domain(max14577->irq_data));
 147         if (ret < 0)
 148                 goto err_mfd;
 149
 150         device_init_wakeup(max14577->dev, 1);
 151
 152         return 0;
 153
 154 err_mfd:
 155         regmap_del_irq_chip(max14577->irq, max14577->irq_data);
 156
 157         return ret;
 158 }
 159
 160 static int max14577_i2c_remove(struct i2c_client *i2c)
 161 {
 162         struct max14577 *max14577 = i2c_get_clientdata(i2c);
 163
 164         mfd_remove_devices(max14577->dev);
 165         regmap_del_irq_chip(max14577->irq, max14577->irq_data);
 166
 167         return 0;
 168 }
 169
 170 static const struct i2c_device_id max14577_i2c_id[] = {
 171         { "max14577", 0 },
 172         { }
 173 };
 174 MODULE_DEVICE_TABLE(i2c, max14577_i2c_id);
 175
 176 static int max14577_suspend(struct device *dev)
 177 {
 178         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 179         struct max14577 *max14577 = i2c_get_clientdata(i2c);
 180
 181         if (device_may_wakeup(dev)) {
 182                 enable_irq_wake(max14577->irq);
 183                 /*
 184                  * MUIC IRQ must be disabled during suspend if this is
 185                  * a wake up source because it will be handled before
 186                  * resuming I2C.
 187                  *
 188                  * When device is woken up from suspend (e.g. by ADC change),
 189                  * an interrupt occurs before resuming I2C bus controller.
 190                  * Interrupt handler tries to read registers but this read
 191                  * will fail because I2C is still suspended.
 192                  */
 193                 disable_irq(max14577->irq);
 194         }
 195
 196         return 0;
 197 }
 198
 199 static int max14577_resume(struct device *dev)
 200 {
 201         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 202         struct max14577 *max14577 = i2c_get_clientdata(i2c);
 203
 204         if (device_may_wakeup(dev)) {
 205                 disable_irq_wake(max14577->irq);
 206                 enable_irq(max14577->irq);
 207         }
 208
 209         return 0;
 210 }
 211
 212 static struct of_device_id max14577_dt_match[] = {
 213         { .compatible = "maxim,max14577", },
 214         {},
 215 };
 216
 217 static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume);
 218
 219 static struct i2c_driver max14577_i2c_driver = {
 220         .driver = {
 221                 .name = "max14577",
 222                 .owner = THIS_MODULE,
 223                 .pm = &max14577_pm,
 224                 .of_match_table = max14577_dt_match,
 225         },
 226         .probe = max14577_i2c_probe,
 227         .remove = max14577_i2c_remove,
 228         .id_table = max14577_i2c_id,
 229 };
 230
 231 static int __init max14577_i2c_init(void)
 232 {
 233         return i2c_add_driver(&max14577_i2c_driver);
 234 }
 235 subsys_initcall(max14577_i2c_init);
 236
 237 static void __exit max14577_i2c_exit(void)
 238 {
 239         i2c_del_driver(&max14577_i2c_driver);
 240 }
 241 module_exit(max14577_i2c_exit);
 242
 243 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>");
 244 MODULE_DESCRIPTION("MAXIM 14577 multi-function core driver");
 245 MODULE_LICENSE("GPL");