drivers/mfd/tc3589x.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2010
   3  *
   4  * License Terms: GNU General Public License, version 2
   5  * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
   6  * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/irq.h>
  12 #include <linux/slab.h>
  13 #include <linux/i2c.h>
  14 #include <linux/mfd/core.h>
  15 #include <linux/mfd/tc3589x.h>
  16
  17 #define TC3589x_CLKMODE_MODCTL_SLEEP            0x0
  18 #define TC3589x_CLKMODE_MODCTL_OPERATION        (1 << 0)
  19
  20 /**
  21  * tc3589x_reg_read() - read a single TC3589x register
  22  * @tc3589x:    Device to read from
  23  * @reg:        Register to read
  24  */
  25 int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg)
  26 {
  27         int ret;
  28
  29         ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg);
  30         if (ret < 0)
  31                 dev_err(tc3589x->dev, "failed to read reg %#x: %d\n",
  32                         reg, ret);
  33
  34         return ret;
  35 }
  36 EXPORT_SYMBOL_GPL(tc3589x_reg_read);
  37
  38 /**
  39  * tc3589x_reg_read() - write a single TC3589x register
  40  * @tc3589x:    Device to write to
  41  * @reg:        Register to read
  42  * @data:       Value to write
  43  */
  44 int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data)
  45 {
  46         int ret;
  47
  48         ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data);
  49         if (ret < 0)
  50                 dev_err(tc3589x->dev, "failed to write reg %#x: %d\n",
  51                         reg, ret);
  52
  53         return ret;
  54 }
  55 EXPORT_SYMBOL_GPL(tc3589x_reg_write);
  56
  57 /**
  58  * tc3589x_block_read() - read multiple TC3589x registers
  59  * @tc3589x:    Device to read from
  60  * @reg:        First register
  61  * @length:     Number of registers
  62  * @values:     Buffer to write to
  63  */
  64 int tc3589x_block_read(struct tc3589x *tc3589x, u8 reg, u8 length, u8 *values)
  65 {
  66         int ret;
  67
  68         ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values);
  69         if (ret < 0)
  70                 dev_err(tc3589x->dev, "failed to read regs %#x: %d\n",
  71                         reg, ret);
  72
  73         return ret;
  74 }
  75 EXPORT_SYMBOL_GPL(tc3589x_block_read);
  76
  77 /**
  78  * tc3589x_block_write() - write multiple TC3589x registers
  79  * @tc3589x:    Device to write to
  80  * @reg:        First register
  81  * @length:     Number of registers
  82  * @values:     Values to write
  83  */
  84 int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length,
  85                         const u8 *values)
  86 {
  87         int ret;
  88
  89         ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length,
  90                                              values);
  91         if (ret < 0)
  92                 dev_err(tc3589x->dev, "failed to write regs %#x: %d\n",
  93                         reg, ret);
  94
  95         return ret;
  96 }
  97 EXPORT_SYMBOL_GPL(tc3589x_block_write);
  98
  99 /**
 100  * tc3589x_set_bits() - set the value of a bitfield in a TC3589x register
 101  * @tc3589x:    Device to write to
 102  * @reg:        Register to write
 103  * @mask:       Mask of bits to set
 104  * @values:     Value to set
 105  */
 106 int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val)
 107 {
 108         int ret;
 109
 110         mutex_lock(&tc3589x->lock);
 111
 112         ret = tc3589x_reg_read(tc3589x, reg);
 113         if (ret < 0)
 114                 goto out;
 115
 116         ret &= ~mask;
 117         ret |= val;
 118
 119         ret = tc3589x_reg_write(tc3589x, reg, ret);
 120
 121 out:
 122         mutex_unlock(&tc3589x->lock);
 123         return ret;
 124 }
 125 EXPORT_SYMBOL_GPL(tc3589x_set_bits);
 126
 127 static struct resource gpio_resources[] = {
 128         {
 129                 .start  = TC3589x_INT_GPIIRQ,
 130                 .end    = TC3589x_INT_GPIIRQ,
 131                 .flags  = IORESOURCE_IRQ,
 132         },
 133 };
 134
 135 static struct resource keypad_resources[] = {
 136         {
 137                 .start  = TC3589x_INT_KBDIRQ,
 138                 .end    = TC3589x_INT_KBDIRQ,
 139                 .flags  = IORESOURCE_IRQ,
 140         },
 141 };
 142
 143 static struct mfd_cell tc3589x_dev_gpio[] = {
 144         {
 145                 .name           = "tc3589x-gpio",
 146                 .num_resources  = ARRAY_SIZE(gpio_resources),
 147                 .resources      = &gpio_resources[0],
 148         },
 149 };
 150
 151 static struct mfd_cell tc3589x_dev_keypad[] = {
 152         {
 153                 .name           = "tc3589x-keypad",
 154                 .num_resources  = ARRAY_SIZE(keypad_resources),
 155                 .resources      = &keypad_resources[0],
 156         },
 157 };
 158
 159 static irqreturn_t tc3589x_irq(int irq, void *data)
 160 {
 161         struct tc3589x *tc3589x = data;
 162         int status;
 163
 164 again:
 165         status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
 166         if (status < 0)
 167                 return IRQ_NONE;
 168
 169         while (status) {
 170                 int bit = __ffs(status);
 171
 172                 handle_nested_irq(tc3589x->irq_base + bit);
 173                 status &= ~(1 << bit);
 174         }
 175
 176         /*
 177          * A dummy read or write (to any register) appears to be necessary to
 178          * have the last interrupt clear (for example, GPIO IC write) take
 179          * effect. In such a case, recheck for any interrupt which is still
 180          * pending.
 181          */
 182         status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
 183         if (status)
 184                 goto again;
 185
 186         return IRQ_HANDLED;
 187 }
 188
 189 static int tc3589x_irq_init(struct tc3589x *tc3589x)
 190 {
 191         int base = tc3589x->irq_base;
 192         int irq;
 193
 194         for (irq = base; irq < base + TC3589x_NR_INTERNAL_IRQS; irq++) {
 195                 irq_set_chip_data(irq, tc3589x);
 196                 irq_set_chip_and_handler(irq, &dummy_irq_chip,
 197                                          handle_edge_irq);
 198                 irq_set_nested_thread(irq, 1);
 199 #ifdef CONFIG_ARM
 200                 set_irq_flags(irq, IRQF_VALID);
 201 #else
 202                 irq_set_noprobe(irq);
 203 #endif
 204         }
 205
 206         return 0;
 207 }
 208
 209 static void tc3589x_irq_remove(struct tc3589x *tc3589x)
 210 {
 211         int base = tc3589x->irq_base;
 212         int irq;
 213
 214         for (irq = base; irq < base + TC3589x_NR_INTERNAL_IRQS; irq++) {
 215 #ifdef CONFIG_ARM
 216                 set_irq_flags(irq, 0);
 217 #endif
 218                 irq_set_chip_and_handler(irq, NULL, NULL);
 219                 irq_set_chip_data(irq, NULL);
 220         }
 221 }
 222
 223 static int tc3589x_chip_init(struct tc3589x *tc3589x)
 224 {
 225         int manf, ver, ret;
 226
 227         manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
 228         if (manf < 0)
 229                 return manf;
 230
 231         ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
 232         if (ver < 0)
 233                 return ver;
 234
 235         if (manf != TC3589x_MANFCODE_MAGIC) {
 236                 dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
 237                 return -EINVAL;
 238         }
 239
 240         dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
 241
 242         /*
 243          * Put everything except the IRQ module into reset;
 244          * also spare the GPIO module for any pin initialization
 245          * done during pre-kernel boot
 246          */
 247         ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
 248                                 TC3589x_RSTCTRL_TIMRST
 249                                 | TC3589x_RSTCTRL_ROTRST
 250                                 | TC3589x_RSTCTRL_KBDRST);
 251         if (ret < 0)
 252                 return ret;
 253
 254         /* Clear the reset interrupt. */
 255         return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
 256 }
 257
 258 static int __devinit tc3589x_device_init(struct tc3589x *tc3589x)
 259 {
 260         int ret = 0;
 261         unsigned int blocks = tc3589x->pdata->block;
 262
 263         if (blocks & TC3589x_BLOCK_GPIO) {
 264                 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
 265                                 ARRAY_SIZE(tc3589x_dev_gpio), NULL,
 266                                 tc3589x->irq_base);
 267                 if (ret) {
 268                         dev_err(tc3589x->dev, "failed to add gpio child\n");
 269                         return ret;
 270                 }
 271                 dev_info(tc3589x->dev, "added gpio block\n");
 272         }
 273
 274         if (blocks & TC3589x_BLOCK_KEYPAD) {
 275                 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
 276                                 ARRAY_SIZE(tc3589x_dev_keypad), NULL,
 277                                 tc3589x->irq_base);
 278                 if (ret) {
 279                         dev_err(tc3589x->dev, "failed to keypad child\n");
 280                         return ret;
 281                 }
 282                 dev_info(tc3589x->dev, "added keypad block\n");
 283         }
 284
 285         return ret;
 286 }
 287
 288 static int __devinit tc3589x_probe(struct i2c_client *i2c,
 289                                    const struct i2c_device_id *id)
 290 {
 291         struct tc3589x_platform_data *pdata = i2c->dev.platform_data;
 292         struct tc3589x *tc3589x;
 293         int ret;
 294
 295         if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
 296                                      | I2C_FUNC_SMBUS_I2C_BLOCK))
 297                 return -EIO;
 298
 299         tc3589x = kzalloc(sizeof(struct tc3589x), GFP_KERNEL);
 300         if (!tc3589x)
 301                 return -ENOMEM;
 302
 303         mutex_init(&tc3589x->lock);
 304
 305         tc3589x->dev = &i2c->dev;
 306         tc3589x->i2c = i2c;
 307         tc3589x->pdata = pdata;
 308         tc3589x->irq_base = pdata->irq_base;
 309         tc3589x->num_gpio = id->driver_data;
 310
 311         i2c_set_clientdata(i2c, tc3589x);
 312
 313         ret = tc3589x_chip_init(tc3589x);
 314         if (ret)
 315                 goto out_free;
 316
 317         ret = tc3589x_irq_init(tc3589x);
 318         if (ret)
 319                 goto out_free;
 320
 321         ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
 322                                    IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 323                                    "tc3589x", tc3589x);
 324         if (ret) {
 325                 dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
 326                 goto out_removeirq;
 327         }
 328
 329         ret = tc3589x_device_init(tc3589x);
 330         if (ret) {
 331                 dev_err(tc3589x->dev, "failed to add child devices\n");
 332                 goto out_freeirq;
 333         }
 334
 335         return 0;
 336
 337 out_freeirq:
 338         free_irq(tc3589x->i2c->irq, tc3589x);
 339 out_removeirq:
 340         tc3589x_irq_remove(tc3589x);
 341 out_free:
 342         kfree(tc3589x);
 343         return ret;
 344 }
 345
 346 static int __devexit tc3589x_remove(struct i2c_client *client)
 347 {
 348         struct tc3589x *tc3589x = i2c_get_clientdata(client);
 349
 350         mfd_remove_devices(tc3589x->dev);
 351
 352         free_irq(tc3589x->i2c->irq, tc3589x);
 353         tc3589x_irq_remove(tc3589x);
 354
 355         kfree(tc3589x);
 356
 357         return 0;
 358 }
 359
 360 static int tc3589x_suspend(struct device *dev)
 361 {
 362         struct tc3589x *tc3589x = dev_get_drvdata(dev);
 363         struct i2c_client *client = tc3589x->i2c;
 364         int ret = 0;
 365
 366         /* put the system to sleep mode */
 367         if (!device_may_wakeup(&client->dev))
 368                 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
 369                                 TC3589x_CLKMODE_MODCTL_SLEEP);
 370
 371         return ret;
 372 }
 373
 374 static int tc3589x_resume(struct device *dev)
 375 {
 376         struct tc3589x *tc3589x = dev_get_drvdata(dev);
 377         struct i2c_client *client = tc3589x->i2c;
 378         int ret = 0;
 379
 380         /* enable the system into operation */
 381         if (!device_may_wakeup(&client->dev))
 382                 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
 383                                 TC3589x_CLKMODE_MODCTL_OPERATION);
 384
 385         return ret;
 386 }
 387
 388 static const SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, tc3589x_suspend,
 389                                                 tc3589x_resume);
 390
 391 static const struct i2c_device_id tc3589x_id[] = {
 392         { "tc3589x", 24 },
 393         { }
 394 };
 395 MODULE_DEVICE_TABLE(i2c, tc3589x_id);
 396
 397 static struct i2c_driver tc3589x_driver = {
 398         .driver.name    = "tc3589x",
 399         .driver.owner   = THIS_MODULE,
 400 #ifdef CONFIG_PM
 401         .driver.pm      = &tc3589x_dev_pm_ops,
 402 #endif
 403         .probe          = tc3589x_probe,
 404         .remove         = __devexit_p(tc3589x_remove),
 405         .id_table       = tc3589x_id,
 406 };
 407
 408 static int __init tc3589x_init(void)
 409 {
 410         return i2c_add_driver(&tc3589x_driver);
 411 }
 412 subsys_initcall(tc3589x_init);
 413
 414 static void __exit tc3589x_exit(void)
 415 {
 416         i2c_del_driver(&tc3589x_driver);
 417 }
 418 module_exit(tc3589x_exit);
 419
 420 MODULE_LICENSE("GPL v2");
 421 MODULE_DESCRIPTION("TC3589x MFD core driver");
 422 MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");