drivers/mfd/tps65090.c

   1 /*
   2  * Core driver for TI TPS65090 PMIC family
   3  *
   4  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   5
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <linux/interrupt.h>
  20 #include <linux/irq.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/mutex.h>
  24 #include <linux/slab.h>
  25 #include <linux/i2c.h>
  26 #include <linux/mfd/core.h>
  27 #include <linux/mfd/tps65090.h>
  28 #include <linux/regmap.h>
  29 #include <linux/err.h>
  30
  31 #define NUM_INT_REG 2
  32 #define TOTAL_NUM_REG 0x18
  33
  34 /* interrupt status registers */
  35 #define TPS65090_INT_STS        0x0
  36 #define TPS65090_INT_STS2       0x1
  37
  38 /* interrupt mask registers */
  39 #define TPS65090_INT_MSK        0x2
  40 #define TPS65090_INT_MSK2       0x3
  41
  42 struct tps65090_irq_data {
  43         u8              mask_reg;
  44         u8              mask_pos;
  45 };
  46
  47 #define TPS65090_IRQ(_reg, _mask_pos)           \
  48         {                                       \
  49                 .mask_reg       = (_reg),       \
  50                 .mask_pos       = (_mask_pos),  \
  51         }
  52
  53 static const struct tps65090_irq_data tps65090_irqs[] = {
  54         [0]             = TPS65090_IRQ(0, 0),
  55         [1]             = TPS65090_IRQ(0, 1),
  56         [2]             = TPS65090_IRQ(0, 2),
  57         [3]             = TPS65090_IRQ(0, 3),
  58         [4]             = TPS65090_IRQ(0, 4),
  59         [5]             = TPS65090_IRQ(0, 5),
  60         [6]             = TPS65090_IRQ(0, 6),
  61         [7]             = TPS65090_IRQ(0, 7),
  62         [8]             = TPS65090_IRQ(1, 0),
  63         [9]             = TPS65090_IRQ(1, 1),
  64         [10]            = TPS65090_IRQ(1, 2),
  65         [11]            = TPS65090_IRQ(1, 3),
  66         [12]            = TPS65090_IRQ(1, 4),
  67         [13]            = TPS65090_IRQ(1, 5),
  68         [14]            = TPS65090_IRQ(1, 6),
  69         [15]            = TPS65090_IRQ(1, 7),
  70 };
  71
  72 static struct mfd_cell tps65090s[] = {
  73         {
  74                 .name = "tps65910-pmic",
  75         },
  76         {
  77                 .name = "tps65910-regulator",
  78         },
  79 };
  80
  81 int tps65090_write(struct device *dev, int reg, uint8_t val)
  82 {
  83         struct tps65090 *tps = dev_get_drvdata(dev);
  84         return regmap_write(tps->rmap, reg, val);
  85 }
  86 EXPORT_SYMBOL_GPL(tps65090_write);
  87
  88 int tps65090_read(struct device *dev, int reg, uint8_t *val)
  89 {
  90         struct tps65090 *tps = dev_get_drvdata(dev);
  91         unsigned int temp_val;
  92         int ret;
  93         ret = regmap_read(tps->rmap, reg, &temp_val);
  94         if (!ret)
  95                 *val = temp_val;
  96         return ret;
  97 }
  98 EXPORT_SYMBOL_GPL(tps65090_read);
  99
 100 int tps65090_set_bits(struct device *dev, int reg, uint8_t bit_num)
 101 {
 102         struct tps65090 *tps = dev_get_drvdata(dev);
 103         return regmap_update_bits(tps->rmap, reg, BIT(bit_num), ~0u);
 104 }
 105 EXPORT_SYMBOL_GPL(tps65090_set_bits);
 106
 107 int tps65090_clr_bits(struct device *dev, int reg, uint8_t bit_num)
 108 {
 109         struct tps65090 *tps = dev_get_drvdata(dev);
 110         return regmap_update_bits(tps->rmap, reg, BIT(bit_num), 0u);
 111 }
 112 EXPORT_SYMBOL_GPL(tps65090_clr_bits);
 113
 114 static void tps65090_irq_lock(struct irq_data *data)
 115 {
 116         struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data);
 117
 118         mutex_lock(&tps65090->irq_lock);
 119 }
 120
 121 static void tps65090_irq_mask(struct irq_data *irq_data)
 122 {
 123         struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data);
 124         unsigned int __irq = irq_data->hwirq;
 125         const struct tps65090_irq_data *data = &tps65090_irqs[__irq];
 126
 127         tps65090_set_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg),
 128                 data->mask_pos);
 129 }
 130
 131 static void tps65090_irq_unmask(struct irq_data *irq_data)
 132 {
 133         struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data);
 134         unsigned int __irq = irq_data->irq - tps65090->irq_base;
 135         const struct tps65090_irq_data *data = &tps65090_irqs[__irq];
 136
 137         tps65090_clr_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg),
 138                 data->mask_pos);
 139 }
 140
 141 static void tps65090_irq_sync_unlock(struct irq_data *data)
 142 {
 143         struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data);
 144
 145         mutex_unlock(&tps65090->irq_lock);
 146 }
 147
 148 static irqreturn_t tps65090_irq(int irq, void *data)
 149 {
 150         struct tps65090 *tps65090 = data;
 151         int ret = 0;
 152         u8 status, mask;
 153         unsigned long int acks = 0;
 154         int i;
 155
 156         for (i = 0; i < NUM_INT_REG; i++) {
 157                 ret = tps65090_read(tps65090->dev, TPS65090_INT_MSK + i, &mask);
 158                 if (ret < 0) {
 159                         dev_err(tps65090->dev,
 160                                 "failed to read mask reg [addr:%d]\n",
 161                                 TPS65090_INT_MSK + i);
 162                         return IRQ_NONE;
 163                 }
 164                 ret = tps65090_read(tps65090->dev, TPS65090_INT_STS + i,
 165                         &status);
 166                 if (ret < 0) {
 167                         dev_err(tps65090->dev,
 168                                 "failed to read status reg [addr:%d]\n",
 169                                  TPS65090_INT_STS + i);
 170                         return IRQ_NONE;
 171                 }
 172                 if (status) {
 173                         /* Ack only those interrupts which are not masked */
 174                         status &= (~mask);
 175                         ret = tps65090_write(tps65090->dev,
 176                                         TPS65090_INT_STS + i, status);
 177                         if (ret < 0) {
 178                                 dev_err(tps65090->dev,
 179                                         "failed to write interrupt status\n");
 180                                 return IRQ_NONE;
 181                         }
 182                         acks |= (status << (i * 8));
 183                 }
 184         }
 185
 186         for_each_set_bit(i, &acks, ARRAY_SIZE(tps65090_irqs))
 187                 handle_nested_irq(tps65090->irq_base + i);
 188         return acks ? IRQ_HANDLED : IRQ_NONE;
 189 }
 190
 191 static int __devinit tps65090_irq_init(struct tps65090 *tps65090, int irq,
 192         int irq_base)
 193 {
 194         int i, ret;
 195
 196         if (!irq_base) {
 197                 dev_err(tps65090->dev, "IRQ base not set\n");
 198                 return -EINVAL;
 199         }
 200
 201         mutex_init(&tps65090->irq_lock);
 202
 203         for (i = 0; i < NUM_INT_REG; i++)
 204                 tps65090_write(tps65090->dev, TPS65090_INT_MSK + i, 0xFF);
 205
 206         for (i = 0; i < NUM_INT_REG; i++)
 207                 tps65090_write(tps65090->dev, TPS65090_INT_STS + i, 0xff);
 208
 209         tps65090->irq_base = irq_base;
 210         tps65090->irq_chip.name = "tps65090";
 211         tps65090->irq_chip.irq_mask = tps65090_irq_mask;
 212         tps65090->irq_chip.irq_unmask = tps65090_irq_unmask;
 213         tps65090->irq_chip.irq_bus_lock = tps65090_irq_lock;
 214         tps65090->irq_chip.irq_bus_sync_unlock = tps65090_irq_sync_unlock;
 215
 216         for (i = 0; i < ARRAY_SIZE(tps65090_irqs); i++) {
 217                 int __irq = i + tps65090->irq_base;
 218                 irq_set_chip_data(__irq, tps65090);
 219                 irq_set_chip_and_handler(__irq, &tps65090->irq_chip,
 220                                          handle_simple_irq);
 221                 irq_set_nested_thread(__irq, 1);
 222 #ifdef CONFIG_ARM
 223                 set_irq_flags(__irq, IRQF_VALID);
 224 #endif
 225         }
 226
 227         ret = request_threaded_irq(irq, NULL, tps65090_irq, IRQF_ONESHOT,
 228                                 "tps65090", tps65090);
 229         if (!ret) {
 230                 device_init_wakeup(tps65090->dev, 1);
 231                 enable_irq_wake(irq);
 232         }
 233
 234         return ret;
 235 }
 236
 237 static bool is_volatile_reg(struct device *dev, unsigned int reg)
 238 {
 239         if ((reg == TPS65090_INT_STS) || (reg == TPS65090_INT_STS))
 240                 return true;
 241         else
 242                 return false;
 243 }
 244
 245 static const struct regmap_config tps65090_regmap_config = {
 246         .reg_bits = 8,
 247         .val_bits = 8,
 248         .max_register = TOTAL_NUM_REG,
 249         .num_reg_defaults_raw = TOTAL_NUM_REG,
 250         .cache_type = REGCACHE_RBTREE,
 251         .volatile_reg = is_volatile_reg,
 252 };
 253
 254 static int __devinit tps65090_i2c_probe(struct i2c_client *client,
 255                                         const struct i2c_device_id *id)
 256 {
 257         struct tps65090_platform_data *pdata = client->dev.platform_data;
 258         struct tps65090 *tps65090;
 259         int ret;
 260
 261         if (!pdata) {
 262                 dev_err(&client->dev, "tps65090 requires platform data\n");
 263                 return -EINVAL;
 264         }
 265
 266         tps65090 = devm_kzalloc(&client->dev, sizeof(struct tps65090),
 267                 GFP_KERNEL);
 268         if (tps65090 == NULL)
 269                 return -ENOMEM;
 270
 271         tps65090->client = client;
 272         tps65090->dev = &client->dev;
 273         i2c_set_clientdata(client, tps65090);
 274
 275         mutex_init(&tps65090->lock);
 276
 277         if (client->irq) {
 278                 ret = tps65090_irq_init(tps65090, client->irq, pdata->irq_base);
 279                 if (ret) {
 280                         dev_err(&client->dev, "IRQ init failed with err: %d\n",
 281                                 ret);
 282                         goto err_exit;
 283                 }
 284         }
 285
 286         tps65090->rmap = devm_regmap_init_i2c(tps65090->client,
 287                                               &tps65090_regmap_config);
 288         if (IS_ERR(tps65090->rmap)) {
 289                 ret = PTR_ERR(tps65090->rmap);
 290                 dev_err(&client->dev, "regmap_init failed with err: %d\n", ret);
 291                 goto err_irq_exit;
 292         }
 293
 294         ret = mfd_add_devices(tps65090->dev, -1, tps65090s,
 295                 ARRAY_SIZE(tps65090s), NULL, 0);
 296         if (ret) {
 297                 dev_err(&client->dev, "add mfd devices failed with err: %d\n",
 298                         ret);
 299                 goto err_irq_exit;
 300         }
 301
 302         return 0;
 303
 304 err_irq_exit:
 305         if (client->irq)
 306                 free_irq(client->irq, tps65090);
 307 err_exit:
 308         return ret;
 309 }
 310
 311 static int __devexit tps65090_i2c_remove(struct i2c_client *client)
 312 {
 313         struct tps65090 *tps65090 = i2c_get_clientdata(client);
 314
 315         mfd_remove_devices(tps65090->dev);
 316         if (client->irq)
 317                 free_irq(client->irq, tps65090);
 318
 319         return 0;
 320 }
 321
 322 #ifdef CONFIG_PM_SLEEP
 323 static int tps65090_suspend(struct device *dev)
 324 {
 325         struct i2c_client *client = to_i2c_client(dev);
 326         if (client->irq)
 327                 disable_irq(client->irq);
 328         return 0;
 329 }
 330
 331 static int tps65090_resume(struct device *dev)
 332 {
 333         struct i2c_client *client = to_i2c_client(dev);
 334         if (client->irq)
 335                 enable_irq(client->irq);
 336         return 0;
 337 }
 338 #endif
 339
 340 static const struct dev_pm_ops tps65090_pm_ops = {
 341         SET_SYSTEM_SLEEP_PM_OPS(tps65090_suspend, tps65090_resume)
 342 };
 343
 344 static const struct i2c_device_id tps65090_id_table[] = {
 345         { "tps65090", 0 },
 346         { },
 347 };
 348 MODULE_DEVICE_TABLE(i2c, tps65090_id_table);
 349
 350 static struct i2c_driver tps65090_driver = {
 351         .driver = {
 352                 .name   = "tps65090",
 353                 .owner  = THIS_MODULE,
 354                 .pm     = &tps65090_pm_ops,
 355         },
 356         .probe          = tps65090_i2c_probe,
 357         .remove         = __devexit_p(tps65090_i2c_remove),
 358         .id_table       = tps65090_id_table,
 359 };
 360
 361 static int __init tps65090_init(void)
 362 {
 363         return i2c_add_driver(&tps65090_driver);
 364 }
 365 subsys_initcall(tps65090_init);
 366
 367 static void __exit tps65090_exit(void)
 368 {
 369         i2c_del_driver(&tps65090_driver);
 370 }
 371 module_exit(tps65090_exit);
 372
 373 MODULE_DESCRIPTION("TPS65090 core driver");
 374 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
 375 MODULE_LICENSE("GPL v2");