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 inline unsigned long max8998_i2c_get_driver_data(struct i2c_client *i2c,
 156                                                 const struct i2c_device_id *id)
 157 {
 158         if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
 159                 const struct of_device_id *match;
 160                 match = of_match_node(max8998_dt_match, i2c->dev.of_node);
 161                 return (unsigned long)match->data;
 162         }
 163
 164         return id->driver_data;
 165 }
 166
 167 static int max8998_i2c_probe(struct i2c_client *i2c,
 168                             const struct i2c_device_id *id)
 169 {
 170         struct max8998_platform_data *pdata = dev_get_platdata(&i2c->dev);
 171         struct max8998_dev *max8998;
 172         int ret = 0;
 173
 174         max8998 = devm_kzalloc(&i2c->dev, sizeof(struct max8998_dev),
 175                                 GFP_KERNEL);
 176         if (max8998 == NULL)
 177                 return -ENOMEM;
 178
 179         if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
 180                 pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
 181                 if (IS_ERR(pdata))
 182                         return PTR_ERR(pdata);
 183         }
 184
 185         i2c_set_clientdata(i2c, max8998);
 186         max8998->dev = &i2c->dev;
 187         max8998->i2c = i2c;
 188         max8998->irq = i2c->irq;
 189         max8998->type = max8998_i2c_get_driver_data(i2c, id);
 190         max8998->pdata = pdata;
 191         if (pdata) {
 192                 max8998->ono = pdata->ono;
 193                 max8998->irq_base = pdata->irq_base;
 194                 max8998->wakeup = pdata->wakeup;
 195         }
 196         mutex_init(&max8998->iolock);
 197
 198         max8998->rtc = i2c_new_dummy_device(i2c->adapter, RTC_I2C_ADDR);
 199         if (IS_ERR(max8998->rtc)) {
 200                 dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
 201                 return PTR_ERR(max8998->rtc);
 202         }
 203         i2c_set_clientdata(max8998->rtc, max8998);
 204
 205         max8998_irq_init(max8998);
 206
 207         pm_runtime_set_active(max8998->dev);
 208
 209         switch (max8998->type) {
 210         case TYPE_LP3974:
 211                 ret = mfd_add_devices(max8998->dev, -1,
 212                                       lp3974_devs, ARRAY_SIZE(lp3974_devs),
 213                                       NULL, 0, NULL);
 214                 break;
 215         case TYPE_MAX8998:
 216                 ret = mfd_add_devices(max8998->dev, -1,
 217                                       max8998_devs, ARRAY_SIZE(max8998_devs),
 218                                       NULL, 0, NULL);
 219                 break;
 220         default:
 221                 ret = -EINVAL;
 222         }
 223
 224         if (ret < 0)
 225                 goto err;
 226
 227         device_init_wakeup(max8998->dev, max8998->wakeup);
 228
 229         return ret;
 230
 231 err:
 232         mfd_remove_devices(max8998->dev);
 233         max8998_irq_exit(max8998);
 234         i2c_unregister_device(max8998->rtc);
 235         return ret;
 236 }
 237
 238 static const struct i2c_device_id max8998_i2c_id[] = {
 239         { "max8998", TYPE_MAX8998 },
 240         { "lp3974", TYPE_LP3974},
 241         { }
 242 };
 243
 244 static int max8998_suspend(struct device *dev)
 245 {
 246         struct i2c_client *i2c = to_i2c_client(dev);
 247         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 248
 249         if (device_may_wakeup(dev))
 250                 irq_set_irq_wake(max8998->irq, 1);
 251         return 0;
 252 }
 253
 254 static int max8998_resume(struct device *dev)
 255 {
 256         struct i2c_client *i2c = to_i2c_client(dev);
 257         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 258
 259         if (device_may_wakeup(dev))
 260                 irq_set_irq_wake(max8998->irq, 0);
 261         /*
 262          * In LP3974, if IRQ registers are not "read & clear"
 263          * when it's set during sleep, the interrupt becomes
 264          * disabled.
 265          */
 266         return max8998_irq_resume(i2c_get_clientdata(i2c));
 267 }
 268
 269 struct max8998_reg_dump {
 270         u8      addr;
 271         u8      val;
 272 };
 273 #define SAVE_ITEM(x)    { .addr = (x), .val = 0x0, }
 274 static struct max8998_reg_dump max8998_dump[] = {
 275         SAVE_ITEM(MAX8998_REG_IRQM1),
 276         SAVE_ITEM(MAX8998_REG_IRQM2),
 277         SAVE_ITEM(MAX8998_REG_IRQM3),
 278         SAVE_ITEM(MAX8998_REG_IRQM4),
 279         SAVE_ITEM(MAX8998_REG_STATUSM1),
 280         SAVE_ITEM(MAX8998_REG_STATUSM2),
 281         SAVE_ITEM(MAX8998_REG_CHGR1),
 282         SAVE_ITEM(MAX8998_REG_CHGR2),
 283         SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
 284         SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
 285         SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
 286         SAVE_ITEM(MAX8998_REG_ONOFF1),
 287         SAVE_ITEM(MAX8998_REG_ONOFF2),
 288         SAVE_ITEM(MAX8998_REG_ONOFF3),
 289         SAVE_ITEM(MAX8998_REG_ONOFF4),
 290         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
 291         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
 292         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
 293         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
 294         SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
 295         SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
 296         SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
 297         SAVE_ITEM(MAX8998_REG_LDO4),
 298         SAVE_ITEM(MAX8998_REG_LDO5),
 299         SAVE_ITEM(MAX8998_REG_LDO6),
 300         SAVE_ITEM(MAX8998_REG_LDO7),
 301         SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
 302         SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
 303         SAVE_ITEM(MAX8998_REG_LDO12),
 304         SAVE_ITEM(MAX8998_REG_LDO13),
 305         SAVE_ITEM(MAX8998_REG_LDO14),
 306         SAVE_ITEM(MAX8998_REG_LDO15),
 307         SAVE_ITEM(MAX8998_REG_LDO16),
 308         SAVE_ITEM(MAX8998_REG_LDO17),
 309         SAVE_ITEM(MAX8998_REG_BKCHR),
 310         SAVE_ITEM(MAX8998_REG_LBCNFG1),
 311         SAVE_ITEM(MAX8998_REG_LBCNFG2),
 312 };
 313 /* Save registers before hibernation */
 314 static int max8998_freeze(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_read_reg(i2c, max8998_dump[i].addr,
 321                                 &max8998_dump[i].val);
 322
 323         return 0;
 324 }
 325
 326 /* Restore registers after hibernation */
 327 static int max8998_restore(struct device *dev)
 328 {
 329         struct i2c_client *i2c = to_i2c_client(dev);
 330         int i;
 331
 332         for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
 333                 max8998_write_reg(i2c, max8998_dump[i].addr,
 334                                 max8998_dump[i].val);
 335
 336         return 0;
 337 }
 338
 339 static const struct dev_pm_ops max8998_pm = {
 340         .suspend = max8998_suspend,
 341         .resume = max8998_resume,
 342         .freeze = max8998_freeze,
 343         .restore = max8998_restore,
 344 };
 345
 346 static struct i2c_driver max8998_i2c_driver = {
 347         .driver = {
 348                    .name = "max8998",
 349                    .pm = &max8998_pm,
 350                    .suppress_bind_attrs = true,
 351                    .of_match_table = of_match_ptr(max8998_dt_match),
 352         },
 353         .probe = max8998_i2c_probe,
 354         .id_table = max8998_i2c_id,
 355 };
 356
 357 static int __init max8998_i2c_init(void)
 358 {
 359         return i2c_add_driver(&max8998_i2c_driver);
 360 }
 361 /* init early so consumer devices can complete system boot */
 362 subsys_initcall(max8998_i2c_init);