drivers/mfd/max8998.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // max8998.c - mfd core driver for the Maxim 8998
   4 //
   5 //  Copyright (C) 2009-2010 Samsung Electronics
   6 //  Kyungmin Park <kyungmin.park@samsung.com>
   7 //  Marek Szyprowski <m.szyprowski@samsung.com>
   8
   9 #include <linux/err.h>
  10 #include <linux/init.h>
  11 #include <linux/slab.h>
  12 #include <linux/i2c.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/of.h>
  15 #include <linux/of_irq.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/mutex.h>
  18 #include <linux/mfd/core.h>
  19 #include <linux/mfd/max8998.h>
  20 #include <linux/mfd/max8998-private.h>
  21
  22 #define RTC_I2C_ADDR            (0x0c >> 1)
  23
  24 static const struct mfd_cell max8998_devs[] = {
  25         {
  26                 .name = "max8998-pmic",
  27         }, {
  28                 .name = "max8998-rtc",
  29         }, {
  30                 .name = "max8998-battery",
  31         },
  32 };
  33
  34 static const struct mfd_cell lp3974_devs[] = {
  35         {
  36                 .name = "lp3974-pmic",
  37         }, {
  38                 .name = "lp3974-rtc",
  39         },
  40 };
  41
  42 int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
  43 {
  44         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  45         int ret;
  46
  47         mutex_lock(&max8998->iolock);
  48         ret = i2c_smbus_read_byte_data(i2c, reg);
  49         mutex_unlock(&max8998->iolock);
  50         if (ret < 0)
  51                 return ret;
  52
  53         ret &= 0xff;
  54         *dest = ret;
  55         return 0;
  56 }
  57 EXPORT_SYMBOL(max8998_read_reg);
  58
  59 int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  60 {
  61         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  62         int ret;
  63
  64         mutex_lock(&max8998->iolock);
  65         ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
  66         mutex_unlock(&max8998->iolock);
  67         if (ret < 0)
  68                 return ret;
  69
  70         return 0;
  71 }
  72 EXPORT_SYMBOL(max8998_bulk_read);
  73
  74 int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
  75 {
  76         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  77         int ret;
  78
  79         mutex_lock(&max8998->iolock);
  80         ret = i2c_smbus_write_byte_data(i2c, reg, value);
  81         mutex_unlock(&max8998->iolock);
  82         return ret;
  83 }
  84 EXPORT_SYMBOL(max8998_write_reg);
  85
  86 int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  87 {
  88         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  89         int ret;
  90
  91         mutex_lock(&max8998->iolock);
  92         ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
  93         mutex_unlock(&max8998->iolock);
  94         if (ret < 0)
  95                 return ret;
  96
  97         return 0;
  98 }
  99 EXPORT_SYMBOL(max8998_bulk_write);
 100
 101 int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
 102 {
 103         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 104         int ret;
 105
 106         mutex_lock(&max8998->iolock);
 107         ret = i2c_smbus_read_byte_data(i2c, reg);
 108         if (ret >= 0) {
 109                 u8 old_val = ret & 0xff;
 110                 u8 new_val = (val & mask) | (old_val & (~mask));
 111                 ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
 112         }
 113         mutex_unlock(&max8998->iolock);
 114         return ret;
 115 }
 116 EXPORT_SYMBOL(max8998_update_reg);
 117
 118 #ifdef CONFIG_OF
 119 static const struct of_device_id max8998_dt_match[] = {
 120         { .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
 121         { .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
 122         { .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
 123         {},
 124 };
 125 #endif
 126
 127 /*
 128  * Only the common platform data elements for max8998 are parsed here from the
 129  * device tree. Other sub-modules of max8998 such as pmic, rtc and others have
 130  * to parse their own platform data elements from device tree.
 131  *
 132  * The max8998 platform data structure is instantiated here and the drivers for
 133  * the sub-modules need not instantiate another instance while parsing their
 134  * platform data.
 135  */
 136 static struct max8998_platform_data *max8998_i2c_parse_dt_pdata(
 137                                                         struct device *dev)
 138 {
 139         struct max8998_platform_data *pd;
 140
 141         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 142         if (!pd)
 143                 return ERR_PTR(-ENOMEM);
 144
 145         pd->ono = irq_of_parse_and_map(dev->of_node, 1);
 146
 147         /*
 148          * ToDo: the 'wakeup' member in the platform data is more of a linux
 149          * specfic information. Hence, there is no binding for that yet and
 150          * not parsed here.
 151          */
 152         return pd;
 153 }
 154
 155 static int max8998_i2c_probe(struct i2c_client *i2c)
 156 {
 157         struct max8998_platform_data *pdata = dev_get_platdata(&i2c->dev);
 158         struct max8998_dev *max8998;
 159         int ret = 0;
 160
 161         max8998 = devm_kzalloc(&i2c->dev, sizeof(struct max8998_dev),
 162                                 GFP_KERNEL);
 163         if (max8998 == NULL)
 164                 return -ENOMEM;
 165
 166         if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
 167                 pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
 168                 if (IS_ERR(pdata))
 169                         return PTR_ERR(pdata);
 170         }
 171
 172         i2c_set_clientdata(i2c, max8998);
 173         max8998->dev = &i2c->dev;
 174         max8998->i2c = i2c;
 175         max8998->irq = i2c->irq;
 176         max8998->type = (uintptr_t)i2c_get_match_data(i2c);
 177         max8998->pdata = pdata;
 178         if (pdata) {
 179                 max8998->ono = pdata->ono;
 180                 max8998->irq_base = pdata->irq_base;
 181                 max8998->wakeup = pdata->wakeup;
 182         }
 183         mutex_init(&max8998->iolock);
 184
 185         max8998->rtc = i2c_new_dummy_device(i2c->adapter, RTC_I2C_ADDR);
 186         if (IS_ERR(max8998->rtc)) {
 187                 dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
 188                 return PTR_ERR(max8998->rtc);
 189         }
 190         i2c_set_clientdata(max8998->rtc, max8998);
 191
 192         max8998_irq_init(max8998);
 193
 194         pm_runtime_set_active(max8998->dev);
 195
 196         switch (max8998->type) {
 197         case TYPE_LP3974:
 198                 ret = mfd_add_devices(max8998->dev, -1,
 199                                       lp3974_devs, ARRAY_SIZE(lp3974_devs),
 200                                       NULL, 0, NULL);
 201                 break;
 202         case TYPE_MAX8998:
 203                 ret = mfd_add_devices(max8998->dev, -1,
 204                                       max8998_devs, ARRAY_SIZE(max8998_devs),
 205                                       NULL, 0, NULL);
 206                 break;
 207         default:
 208                 ret = -EINVAL;
 209         }
 210
 211         if (ret < 0)
 212                 goto err;
 213
 214         device_init_wakeup(max8998->dev, max8998->wakeup);
 215
 216         return ret;
 217
 218 err:
 219         mfd_remove_devices(max8998->dev);
 220         max8998_irq_exit(max8998);
 221         i2c_unregister_device(max8998->rtc);
 222         return ret;
 223 }
 224
 225 static const struct i2c_device_id max8998_i2c_id[] = {
 226         { "max8998", TYPE_MAX8998 },
 227         { "lp3974", TYPE_LP3974},
 228         { }
 229 };
 230
 231 static int max8998_suspend(struct device *dev)
 232 {
 233         struct i2c_client *i2c = to_i2c_client(dev);
 234         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 235
 236         if (device_may_wakeup(dev))
 237                 irq_set_irq_wake(max8998->irq, 1);
 238         return 0;
 239 }
 240
 241 static int max8998_resume(struct device *dev)
 242 {
 243         struct i2c_client *i2c = to_i2c_client(dev);
 244         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 245
 246         if (device_may_wakeup(dev))
 247                 irq_set_irq_wake(max8998->irq, 0);
 248         /*
 249          * In LP3974, if IRQ registers are not "read & clear"
 250          * when it's set during sleep, the interrupt becomes
 251          * disabled.
 252          */
 253         return max8998_irq_resume(i2c_get_clientdata(i2c));
 254 }
 255
 256 struct max8998_reg_dump {
 257         u8      addr;
 258         u8      val;
 259 };
 260 #define SAVE_ITEM(x)    { .addr = (x), .val = 0x0, }
 261 static struct max8998_reg_dump max8998_dump[] = {
 262         SAVE_ITEM(MAX8998_REG_IRQM1),
 263         SAVE_ITEM(MAX8998_REG_IRQM2),
 264         SAVE_ITEM(MAX8998_REG_IRQM3),
 265         SAVE_ITEM(MAX8998_REG_IRQM4),
 266         SAVE_ITEM(MAX8998_REG_STATUSM1),
 267         SAVE_ITEM(MAX8998_REG_STATUSM2),
 268         SAVE_ITEM(MAX8998_REG_CHGR1),
 269         SAVE_ITEM(MAX8998_REG_CHGR2),
 270         SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
 271         SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
 272         SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
 273         SAVE_ITEM(MAX8998_REG_ONOFF1),
 274         SAVE_ITEM(MAX8998_REG_ONOFF2),
 275         SAVE_ITEM(MAX8998_REG_ONOFF3),
 276         SAVE_ITEM(MAX8998_REG_ONOFF4),
 277         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
 278         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
 279         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
 280         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
 281         SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
 282         SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
 283         SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
 284         SAVE_ITEM(MAX8998_REG_LDO4),
 285         SAVE_ITEM(MAX8998_REG_LDO5),
 286         SAVE_ITEM(MAX8998_REG_LDO6),
 287         SAVE_ITEM(MAX8998_REG_LDO7),
 288         SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
 289         SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
 290         SAVE_ITEM(MAX8998_REG_LDO12),
 291         SAVE_ITEM(MAX8998_REG_LDO13),
 292         SAVE_ITEM(MAX8998_REG_LDO14),
 293         SAVE_ITEM(MAX8998_REG_LDO15),
 294         SAVE_ITEM(MAX8998_REG_LDO16),
 295         SAVE_ITEM(MAX8998_REG_LDO17),
 296         SAVE_ITEM(MAX8998_REG_BKCHR),
 297         SAVE_ITEM(MAX8998_REG_LBCNFG1),
 298         SAVE_ITEM(MAX8998_REG_LBCNFG2),
 299 };
 300 /* Save registers before hibernation */
 301 static int max8998_freeze(struct device *dev)
 302 {
 303         struct i2c_client *i2c = to_i2c_client(dev);
 304         int i;
 305
 306         for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
 307                 max8998_read_reg(i2c, max8998_dump[i].addr,
 308                                 &max8998_dump[i].val);
 309
 310         return 0;
 311 }
 312
 313 /* Restore registers after hibernation */
 314 static int max8998_restore(struct device *dev)
 315 {
 316         struct i2c_client *i2c = to_i2c_client(dev);
 317         int i;
 318
 319         for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
 320                 max8998_write_reg(i2c, max8998_dump[i].addr,
 321                                 max8998_dump[i].val);
 322
 323         return 0;
 324 }
 325
 326 static const struct dev_pm_ops max8998_pm = {
 327         .suspend = max8998_suspend,
 328         .resume = max8998_resume,
 329         .freeze = max8998_freeze,
 330         .restore = max8998_restore,
 331 };
 332
 333 static struct i2c_driver max8998_i2c_driver = {
 334         .driver = {
 335                    .name = "max8998",
 336                    .pm = &max8998_pm,
 337                    .suppress_bind_attrs = true,
 338                    .of_match_table = of_match_ptr(max8998_dt_match),
 339         },
 340         .probe = max8998_i2c_probe,
 341         .id_table = max8998_i2c_id,
 342 };
 343
 344 static int __init max8998_i2c_init(void)
 345 {
 346         return i2c_add_driver(&max8998_i2c_driver);
 347 }
 348 /* init early so consumer devices can complete system boot */
 349 subsys_initcall(max8998_i2c_init);