drivers/mfd/tps65218.c

   1 /*
   2  * Driver for TPS65218 Integrated power management chipsets
   3  *
   4  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  11  * kind, whether expressed or implied; without even the implied warranty
  12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/device.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/init.h>
  21 #include <linux/i2c.h>
  22 #include <linux/slab.h>
  23 #include <linux/regmap.h>
  24 #include <linux/err.h>
  25 #include <linux/of.h>
  26 #include <linux/of_device.h>
  27 #include <linux/irq.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/mutex.h>
  30
  31 #include <linux/mfd/core.h>
  32 #include <linux/mfd/tps65218.h>
  33
  34 #define TPS65218_PASSWORD_REGS_UNLOCK   0x7D
  35
  36 /**
  37  * tps65218_reg_read: Read a single tps65218 register.
  38  *
  39  * @tps: Device to read from.
  40  * @reg: Register to read.
  41  * @val: Contians the value
  42  */
  43 int tps65218_reg_read(struct tps65218 *tps, unsigned int reg,
  44                         unsigned int *val)
  45 {
  46         return regmap_read(tps->regmap, reg, val);
  47 }
  48 EXPORT_SYMBOL_GPL(tps65218_reg_read);
  49
  50 /**
  51  * tps65218_reg_write: Write a single tps65218 register.
  52  *
  53  * @tps65218: Device to write to.
  54  * @reg: Register to write to.
  55  * @val: Value to write.
  56  * @level: Password protected level
  57  */
  58 int tps65218_reg_write(struct tps65218 *tps, unsigned int reg,
  59                         unsigned int val, unsigned int level)
  60 {
  61         int ret;
  62         unsigned int xor_reg_val;
  63
  64         switch (level) {
  65         case TPS65218_PROTECT_NONE:
  66                 return regmap_write(tps->regmap, reg, val);
  67         case TPS65218_PROTECT_L1:
  68                 xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK;
  69                 ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD,
  70                                                         xor_reg_val);
  71                 if (ret < 0)
  72                         return ret;
  73
  74                 return regmap_write(tps->regmap, reg, val);
  75         default:
  76                 return -EINVAL;
  77         }
  78 }
  79 EXPORT_SYMBOL_GPL(tps65218_reg_write);
  80
  81 /**
  82  * tps65218_update_bits: Modify bits w.r.t mask, val and level.
  83  *
  84  * @tps65218: Device to write to.
  85  * @reg: Register to read-write to.
  86  * @mask: Mask.
  87  * @val: Value to write.
  88  * @level: Password protected level
  89  */
  90 static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg,
  91                 unsigned int mask, unsigned int val, unsigned int level)
  92 {
  93         int ret;
  94         unsigned int data;
  95
  96         ret = tps65218_reg_read(tps, reg, &data);
  97         if (ret) {
  98                 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
  99                 return ret;
 100         }
 101
 102         data &= ~mask;
 103         data |= val & mask;
 104
 105         mutex_lock(&tps->tps_lock);
 106         ret = tps65218_reg_write(tps, reg, data, level);
 107         if (ret)
 108                 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
 109         mutex_unlock(&tps->tps_lock);
 110
 111         return ret;
 112 }
 113
 114 int tps65218_set_bits(struct tps65218 *tps, unsigned int reg,
 115                 unsigned int mask, unsigned int val, unsigned int level)
 116 {
 117         return tps65218_update_bits(tps, reg, mask, val, level);
 118 }
 119 EXPORT_SYMBOL_GPL(tps65218_set_bits);
 120
 121 int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg,
 122                 unsigned int mask, unsigned int level)
 123 {
 124         return tps65218_update_bits(tps, reg, mask, 0, level);
 125 }
 126 EXPORT_SYMBOL_GPL(tps65218_clear_bits);
 127
 128 static const struct regmap_range tps65218_yes_ranges[] = {
 129         regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2),
 130         regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS),
 131 };
 132
 133 static const struct regmap_access_table tps65218_volatile_table = {
 134         .yes_ranges = tps65218_yes_ranges,
 135         .n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges),
 136 };
 137
 138 static const struct regmap_config tps65218_regmap_config = {
 139         .reg_bits = 8,
 140         .val_bits = 8,
 141         .cache_type = REGCACHE_RBTREE,
 142         .volatile_table = &tps65218_volatile_table,
 143 };
 144
 145 static const struct regmap_irq tps65218_irqs[] = {
 146         /* INT1 IRQs */
 147         [TPS65218_PRGC_IRQ] = {
 148                 .mask = TPS65218_INT1_PRGC,
 149         },
 150         [TPS65218_CC_AQC_IRQ] = {
 151                 .mask = TPS65218_INT1_CC_AQC,
 152         },
 153         [TPS65218_HOT_IRQ] = {
 154                 .mask = TPS65218_INT1_HOT,
 155         },
 156         [TPS65218_PB_IRQ] = {
 157                 .mask = TPS65218_INT1_PB,
 158         },
 159         [TPS65218_AC_IRQ] = {
 160                 .mask = TPS65218_INT1_AC,
 161         },
 162         [TPS65218_VPRG_IRQ] = {
 163                 .mask = TPS65218_INT1_VPRG,
 164         },
 165         [TPS65218_INVALID1_IRQ] = {
 166         },
 167         [TPS65218_INVALID2_IRQ] = {
 168         },
 169         /* INT2 IRQs*/
 170         [TPS65218_LS1_I_IRQ] = {
 171                 .mask = TPS65218_INT2_LS1_I,
 172                 .reg_offset = 1,
 173         },
 174         [TPS65218_LS2_I_IRQ] = {
 175                 .mask = TPS65218_INT2_LS2_I,
 176                 .reg_offset = 1,
 177         },
 178         [TPS65218_LS3_I_IRQ] = {
 179                 .mask = TPS65218_INT2_LS3_I,
 180                 .reg_offset = 1,
 181         },
 182         [TPS65218_LS1_F_IRQ] = {
 183                 .mask = TPS65218_INT2_LS1_F,
 184                 .reg_offset = 1,
 185         },
 186         [TPS65218_LS2_F_IRQ] = {
 187                 .mask = TPS65218_INT2_LS2_F,
 188                 .reg_offset = 1,
 189         },
 190         [TPS65218_LS3_F_IRQ] = {
 191                 .mask = TPS65218_INT2_LS3_F,
 192                 .reg_offset = 1,
 193         },
 194         [TPS65218_INVALID3_IRQ] = {
 195         },
 196         [TPS65218_INVALID4_IRQ] = {
 197         },
 198 };
 199
 200 static struct regmap_irq_chip tps65218_irq_chip = {
 201         .name = "tps65218",
 202         .irqs = tps65218_irqs,
 203         .num_irqs = ARRAY_SIZE(tps65218_irqs),
 204
 205         .num_regs = 2,
 206         .mask_base = TPS65218_REG_INT_MASK1,
 207         .status_base = TPS65218_REG_INT1,
 208 };
 209
 210 static const struct of_device_id of_tps65218_match_table[] = {
 211         { .compatible = "ti,tps65218", },
 212         {}
 213 };
 214 MODULE_DEVICE_TABLE(of, of_tps65218_match_table);
 215
 216 static int tps65218_probe(struct i2c_client *client,
 217                                 const struct i2c_device_id *ids)
 218 {
 219         struct tps65218 *tps;
 220         const struct of_device_id *match;
 221         int ret;
 222
 223         match = of_match_device(of_tps65218_match_table, &client->dev);
 224         if (!match) {
 225                 dev_err(&client->dev,
 226                         "Failed to find matching dt id\n");
 227                 return -EINVAL;
 228         }
 229
 230         tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
 231         if (!tps)
 232                 return -ENOMEM;
 233
 234         i2c_set_clientdata(client, tps);
 235         tps->dev = &client->dev;
 236         tps->irq = client->irq;
 237         tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
 238         if (IS_ERR(tps->regmap)) {
 239                 ret = PTR_ERR(tps->regmap);
 240                 dev_err(tps->dev, "Failed to allocate register map: %d\n",
 241                         ret);
 242                 return ret;
 243         }
 244
 245         mutex_init(&tps->tps_lock);
 246
 247         ret = regmap_add_irq_chip(tps->regmap, tps->irq,
 248                         IRQF_ONESHOT, 0, &tps65218_irq_chip,
 249                         &tps->irq_data);
 250         if (ret < 0)
 251                 return ret;
 252
 253         ret = of_platform_populate(client->dev.of_node, NULL, NULL,
 254                                    &client->dev);
 255         if (ret < 0)
 256                 goto err_irq;
 257
 258         return 0;
 259
 260 err_irq:
 261         regmap_del_irq_chip(tps->irq, tps->irq_data);
 262
 263         return ret;
 264 }
 265
 266 static int tps65218_remove(struct i2c_client *client)
 267 {
 268         struct tps65218 *tps = i2c_get_clientdata(client);
 269
 270         regmap_del_irq_chip(tps->irq, tps->irq_data);
 271
 272         return 0;
 273 }
 274
 275 static const struct i2c_device_id tps65218_id_table[] = {
 276         { "tps65218", TPS65218 },
 277         { },
 278 };
 279 MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
 280
 281 static struct i2c_driver tps65218_driver = {
 282         .driver         = {
 283                 .name   = "tps65218",
 284                 .of_match_table = of_tps65218_match_table,
 285         },
 286         .probe          = tps65218_probe,
 287         .remove         = tps65218_remove,
 288         .id_table       = tps65218_id_table,
 289 };
 290
 291 module_i2c_driver(tps65218_driver);
 292
 293 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
 294 MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
 295 MODULE_LICENSE("GPL v2");