release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/plat-stmp3xxx/pinmux.c

   1 /*
   2  * Freescale STMP378X/STMP378X Pin Multiplexing
   3  *
   4  * Author: Vladislav Buzov <vbuzov@embeddedalley.com>
   5  *
   6  * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
   7  * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
   8  */
   9
  10 /*
  11  * The code contained herein is licensed under the GNU General Public
  12  * License. You may obtain a copy of the GNU General Public License
  13  * Version 2 or later at the following locations:
  14  *
  15  * http://www.opensource.org/licenses/gpl-license.html
  16  * http://www.gnu.org/copyleft/gpl.html
  17  */
  18 #define DEBUG
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/errno.h>
  22 #include <linux/sysdev.h>
  23 #include <linux/string.h>
  24 #include <linux/bitops.h>
  25 #include <linux/irq.h>
  26
  27 #include <mach/hardware.h>
  28 #include <mach/platform.h>
  29 #include <mach/regs-pinctrl.h>
  30 #include <mach/pins.h>
  31 #include <mach/pinmux.h>
  32
  33 #define NR_BANKS ARRAY_SIZE(pinmux_banks)
  34 static struct stmp3xxx_pinmux_bank pinmux_banks[] = {
  35         [0] = {
  36                 .hw_muxsel = {
  37                         REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL0,
  38                         REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL1,
  39                 },
  40                 .hw_drive = {
  41                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE0,
  42                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE1,
  43                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE2,
  44                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE3,
  45                 },
  46                 .hw_pull = REGS_PINCTRL_BASE + HW_PINCTRL_PULL0,
  47                 .functions = { 0x0, 0x1, 0x2, 0x3 },
  48                 .strengths = { 0x0, 0x1, 0x2, 0x3, 0xff },
  49
  50                 .hw_gpio_in = REGS_PINCTRL_BASE + HW_PINCTRL_DIN0,
  51                 .hw_gpio_out = REGS_PINCTRL_BASE + HW_PINCTRL_DOUT0,
  52                 .hw_gpio_doe = REGS_PINCTRL_BASE + HW_PINCTRL_DOE0,
  53                 .irq = IRQ_GPIO0,
  54
  55                 .pin2irq = REGS_PINCTRL_BASE + HW_PINCTRL_PIN2IRQ0,
  56                 .irqstat = REGS_PINCTRL_BASE + HW_PINCTRL_IRQSTAT0,
  57                 .irqlevel = REGS_PINCTRL_BASE + HW_PINCTRL_IRQLEVEL0,
  58                 .irqpolarity = REGS_PINCTRL_BASE + HW_PINCTRL_IRQPOL0,
  59                 .irqen = REGS_PINCTRL_BASE + HW_PINCTRL_IRQEN0,
  60         },
  61         [1] = {
  62                 .hw_muxsel = {
  63                         REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL2,
  64                         REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL3,
  65                 },
  66                 .hw_drive = {
  67                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE4,
  68                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE5,
  69                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE6,
  70                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE7,
  71                 },
  72                 .hw_pull = REGS_PINCTRL_BASE + HW_PINCTRL_PULL1,
  73                 .functions = { 0x0, 0x1, 0x2, 0x3 },
  74                 .strengths = { 0x0, 0x1, 0x2, 0x3, 0xff },
  75
  76                 .hw_gpio_in = REGS_PINCTRL_BASE + HW_PINCTRL_DIN1,
  77                 .hw_gpio_out = REGS_PINCTRL_BASE + HW_PINCTRL_DOUT1,
  78                 .hw_gpio_doe = REGS_PINCTRL_BASE + HW_PINCTRL_DOE1,
  79                 .irq = IRQ_GPIO1,
  80
  81                 .pin2irq = REGS_PINCTRL_BASE + HW_PINCTRL_PIN2IRQ1,
  82                 .irqstat = REGS_PINCTRL_BASE + HW_PINCTRL_IRQSTAT1,
  83                 .irqlevel = REGS_PINCTRL_BASE + HW_PINCTRL_IRQLEVEL1,
  84                 .irqpolarity = REGS_PINCTRL_BASE + HW_PINCTRL_IRQPOL1,
  85                 .irqen = REGS_PINCTRL_BASE + HW_PINCTRL_IRQEN1,
  86         },
  87         [2] = {
  88                .hw_muxsel = {
  89                         REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL4,
  90                         REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL5,
  91                 },
  92                 .hw_drive = {
  93                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE8,
  94                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE9,
  95                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE10,
  96                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE11,
  97                 },
  98                 .hw_pull = REGS_PINCTRL_BASE + HW_PINCTRL_PULL2,
  99                 .functions = { 0x0, 0x1, 0x2, 0x3 },
 100                 .strengths = { 0x0, 0x1, 0x2, 0x1, 0x2 },
 101
 102                 .hw_gpio_in = REGS_PINCTRL_BASE + HW_PINCTRL_DIN2,
 103                 .hw_gpio_out = REGS_PINCTRL_BASE + HW_PINCTRL_DOUT2,
 104                 .hw_gpio_doe = REGS_PINCTRL_BASE + HW_PINCTRL_DOE2,
 105                 .irq = IRQ_GPIO2,
 106
 107                 .pin2irq = REGS_PINCTRL_BASE + HW_PINCTRL_PIN2IRQ2,
 108                 .irqstat = REGS_PINCTRL_BASE + HW_PINCTRL_IRQSTAT2,
 109                 .irqlevel = REGS_PINCTRL_BASE + HW_PINCTRL_IRQLEVEL2,
 110                 .irqpolarity = REGS_PINCTRL_BASE + HW_PINCTRL_IRQPOL2,
 111                 .irqen = REGS_PINCTRL_BASE + HW_PINCTRL_IRQEN2,
 112         },
 113         [3] = {
 114                .hw_muxsel = {
 115                        REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL6,
 116                        REGS_PINCTRL_BASE + HW_PINCTRL_MUXSEL7,
 117                },
 118                .hw_drive = {
 119                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE12,
 120                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE13,
 121                         REGS_PINCTRL_BASE + HW_PINCTRL_DRIVE14,
 122                         NULL,
 123                },
 124                .hw_pull = REGS_PINCTRL_BASE + HW_PINCTRL_PULL3,
 125                .functions = {0x0, 0x1, 0x2, 0x3},
 126                .strengths = {0x0, 0x1, 0x2, 0x3, 0xff},
 127         },
 128 };
 129
 130 static inline struct stmp3xxx_pinmux_bank *
 131 stmp3xxx_pinmux_bank(unsigned id, unsigned *bank, unsigned *pin)
 132 {
 133         unsigned b, p;
 134
 135         b = STMP3XXX_PINID_TO_BANK(id);
 136         p = STMP3XXX_PINID_TO_PINNUM(id);
 137         BUG_ON(b >= NR_BANKS);
 138         if (bank)
 139                 *bank = b;
 140         if (pin)
 141                 *pin = p;
 142         return &pinmux_banks[b];
 143 }
 144
 145 /* Check if requested pin is owned by caller */
 146 static int stmp3xxx_check_pin(unsigned id, const char *label)
 147 {
 148         unsigned pin;
 149         struct stmp3xxx_pinmux_bank *pm = stmp3xxx_pinmux_bank(id, NULL, &pin);
 150
 151         if (!test_bit(pin, &pm->pin_map)) {
 152                 printk(KERN_WARNING
 153                        "%s: Accessing free pin %x, caller %s\n",
 154                        __func__, id, label);
 155
 156                 return -EINVAL;
 157         }
 158
 159         if (label && pm->pin_labels[pin] &&
 160             strcmp(label, pm->pin_labels[pin])) {
 161                 printk(KERN_WARNING
 162                        "%s: Wrong pin owner %x, caller %s owner %s\n",
 163                        __func__, id, label, pm->pin_labels[pin]);
 164
 165                 return -EINVAL;
 166         }
 167         return 0;
 168 }
 169
 170 void stmp3xxx_pin_strength(unsigned id, enum pin_strength strength,
 171                 const char *label)
 172 {
 173         struct stmp3xxx_pinmux_bank *pbank;
 174         void __iomem *hwdrive;
 175         u32 shift, val;
 176         u32 bank, pin;
 177
 178         pbank = stmp3xxx_pinmux_bank(id, &bank, &pin);
 179         pr_debug("%s: label %s bank %d pin %d strength %d\n", __func__, label,
 180                  bank, pin, strength);
 181
 182         hwdrive = pbank->hw_drive[pin / HW_DRIVE_PIN_NUM];
 183         shift = (pin % HW_DRIVE_PIN_NUM) * HW_DRIVE_PIN_LEN;
 184         val = pbank->strengths[strength];
 185         if (val == 0xff) {
 186                 printk(KERN_WARNING
 187                        "%s: strength is not supported for bank %d, caller %s",
 188                        __func__, bank, label);
 189                 return;
 190         }
 191
 192         if (stmp3xxx_check_pin(id, label))
 193                 return;
 194
 195         pr_debug("%s: writing 0x%x to 0x%p register\n", __func__,
 196                         val << shift, hwdrive);
 197         stmp3xxx_clearl(HW_DRIVE_PINDRV_MASK << shift, hwdrive);
 198         stmp3xxx_setl(val << shift, hwdrive);
 199 }
 200
 201 void stmp3xxx_pin_voltage(unsigned id, enum pin_voltage voltage,
 202                           const char *label)
 203 {
 204         struct stmp3xxx_pinmux_bank *pbank;
 205         void __iomem *hwdrive;
 206         u32 shift;
 207         u32 bank, pin;
 208
 209         pbank = stmp3xxx_pinmux_bank(id, &bank, &pin);
 210         pr_debug("%s: label %s bank %d pin %d voltage %d\n", __func__, label,
 211                  bank, pin, voltage);
 212
 213         hwdrive = pbank->hw_drive[pin / HW_DRIVE_PIN_NUM];
 214         shift = (pin % HW_DRIVE_PIN_NUM) * HW_DRIVE_PIN_LEN;
 215
 216         if (stmp3xxx_check_pin(id, label))
 217                 return;
 218
 219         pr_debug("%s: changing 0x%x bit in 0x%p register\n",
 220                         __func__, HW_DRIVE_PINV_MASK << shift, hwdrive);
 221         if (voltage == PIN_1_8V)
 222                 stmp3xxx_clearl(HW_DRIVE_PINV_MASK << shift, hwdrive);
 223         else
 224                 stmp3xxx_setl(HW_DRIVE_PINV_MASK << shift, hwdrive);
 225 }
 226
 227 void stmp3xxx_pin_pullup(unsigned id, int enable, const char *label)
 228 {
 229         struct stmp3xxx_pinmux_bank *pbank;
 230         void __iomem *hwpull;
 231         u32 bank, pin;
 232
 233         pbank = stmp3xxx_pinmux_bank(id, &bank, &pin);
 234         pr_debug("%s: label %s bank %d pin %d enable %d\n", __func__, label,
 235                  bank, pin, enable);
 236
 237         hwpull = pbank->hw_pull;
 238
 239         if (stmp3xxx_check_pin(id, label))
 240                 return;
 241
 242         pr_debug("%s: changing 0x%x bit in 0x%p register\n",
 243                         __func__, 1 << pin, hwpull);
 244         if (enable)
 245                 stmp3xxx_setl(1 << pin, hwpull);
 246         else
 247                 stmp3xxx_clearl(1 << pin, hwpull);
 248 }
 249
 250 int stmp3xxx_request_pin(unsigned id, enum pin_fun fun, const char *label)
 251 {
 252         struct stmp3xxx_pinmux_bank *pbank;
 253         u32 bank, pin;
 254         int ret = 0;
 255
 256         pbank = stmp3xxx_pinmux_bank(id, &bank, &pin);
 257         pr_debug("%s: label %s bank %d pin %d fun %d\n", __func__, label,
 258                  bank, pin, fun);
 259
 260         if (test_bit(pin, &pbank->pin_map)) {
 261                 printk(KERN_WARNING
 262                        "%s: CONFLICT DETECTED pin %d:%d caller %s owner %s\n",
 263                        __func__, bank, pin, label, pbank->pin_labels[pin]);
 264                 return -EBUSY;
 265         }
 266
 267         set_bit(pin, &pbank->pin_map);
 268         pbank->pin_labels[pin] = label;
 269
 270         stmp3xxx_set_pin_type(id, fun);
 271
 272         return ret;
 273 }
 274
 275 void stmp3xxx_set_pin_type(unsigned id, enum pin_fun fun)
 276 {
 277         struct stmp3xxx_pinmux_bank *pbank;
 278         void __iomem *hwmux;
 279         u32 shift, val;
 280         u32 bank, pin;
 281
 282         pbank = stmp3xxx_pinmux_bank(id, &bank, &pin);
 283
 284         hwmux = pbank->hw_muxsel[pin / HW_MUXSEL_PIN_NUM];
 285         shift = (pin % HW_MUXSEL_PIN_NUM) * HW_MUXSEL_PIN_LEN;
 286
 287         val = pbank->functions[fun];
 288         shift = (pin % HW_MUXSEL_PIN_NUM) * HW_MUXSEL_PIN_LEN;
 289         pr_debug("%s: writing 0x%x to 0x%p register\n",
 290                         __func__, val << shift, hwmux);
 291         stmp3xxx_clearl(HW_MUXSEL_PINFUN_MASK << shift, hwmux);
 292         stmp3xxx_setl(val << shift, hwmux);
 293 }
 294
 295 void stmp3xxx_release_pin(unsigned id, const char *label)
 296 {
 297         struct stmp3xxx_pinmux_bank *pbank;
 298         u32 bank, pin;
 299
 300         pbank = stmp3xxx_pinmux_bank(id, &bank, &pin);
 301         pr_debug("%s: label %s bank %d pin %d\n", __func__, label, bank, pin);
 302
 303         if (stmp3xxx_check_pin(id, label))
 304                 return;
 305
 306         clear_bit(pin, &pbank->pin_map);
 307         pbank->pin_labels[pin] = NULL;
 308 }
 309
 310 int stmp3xxx_request_pin_group(struct pin_group *pin_group, const char *label)
 311 {
 312         struct pin_desc *pin;
 313         int p;
 314         int err = 0;
 315
 316         /* Allocate and configure pins */
 317         for (p = 0; p < pin_group->nr_pins; p++) {
 318                 pr_debug("%s: #%d\n", __func__, p);
 319                 pin = &pin_group->pins[p];
 320
 321                 err = stmp3xxx_request_pin(pin->id, pin->fun, label);
 322                 if (err)
 323                         goto out_err;
 324
 325                 stmp3xxx_pin_strength(pin->id, pin->strength, label);
 326                 stmp3xxx_pin_voltage(pin->id, pin->voltage, label);
 327                 stmp3xxx_pin_pullup(pin->id, pin->pullup, label);
 328         }
 329
 330         return 0;
 331
 332 out_err:
 333         /* Release allocated pins in case of error */
 334         while (--p >= 0) {
 335                 pr_debug("%s: releasing #%d\n", __func__, p);
 336                 stmp3xxx_release_pin(pin_group->pins[p].id, label);
 337         }
 338         return err;
 339 }
 340 EXPORT_SYMBOL(stmp3xxx_request_pin_group);
 341
 342 void stmp3xxx_release_pin_group(struct pin_group *pin_group, const char *label)
 343 {
 344         struct pin_desc *pin;
 345         int p;
 346
 347         for (p = 0; p < pin_group->nr_pins; p++) {
 348                 pin = &pin_group->pins[p];
 349                 stmp3xxx_release_pin(pin->id, label);
 350         }
 351 }
 352 EXPORT_SYMBOL(stmp3xxx_release_pin_group);
 353
 354 static int stmp3xxx_irq_to_gpio(int irq,
 355         struct stmp3xxx_pinmux_bank **bank, unsigned *gpio)
 356 {
 357         struct stmp3xxx_pinmux_bank *pm;
 358
 359         for (pm = pinmux_banks; pm < pinmux_banks + NR_BANKS; pm++)
 360                 if (pm->virq <= irq && irq < pm->virq + 32) {
 361                         *bank = pm;
 362                         *gpio = irq - pm->virq;
 363                         return 0;
 364                 }
 365         return -ENOENT;
 366 }
 367
 368 static int stmp3xxx_set_irqtype(unsigned irq, unsigned type)
 369 {
 370         struct stmp3xxx_pinmux_bank *pm;
 371         unsigned gpio;
 372         int l, p;
 373
 374         stmp3xxx_irq_to_gpio(irq, &pm, &gpio);
 375         switch (type) {
 376         case IRQ_TYPE_EDGE_RISING:
 377                 l = 0; p = 1; break;
 378         case IRQ_TYPE_EDGE_FALLING:
 379                 l = 0; p = 0; break;
 380         case IRQ_TYPE_LEVEL_HIGH:
 381                 l = 1; p = 1; break;
 382         case IRQ_TYPE_LEVEL_LOW:
 383                 l = 1; p = 0; break;
 384         default:
 385                 pr_debug("%s: Incorrect GPIO interrupt type 0x%x\n",
 386                                 __func__, type);
 387                 return -ENXIO;
 388         }
 389
 390         if (l)
 391                 stmp3xxx_setl(1 << gpio, pm->irqlevel);
 392         else
 393                 stmp3xxx_clearl(1 << gpio, pm->irqlevel);
 394         if (p)
 395                 stmp3xxx_setl(1 << gpio, pm->irqpolarity);
 396         else
 397                 stmp3xxx_clearl(1 << gpio, pm->irqpolarity);
 398         return 0;
 399 }
 400
 401 static void stmp3xxx_pin_ack_irq(unsigned irq)
 402 {
 403         u32 stat;
 404         struct stmp3xxx_pinmux_bank *pm;
 405         unsigned gpio;
 406
 407         stmp3xxx_irq_to_gpio(irq, &pm, &gpio);
 408         stat = __raw_readl(pm->irqstat) & (1 << gpio);
 409         stmp3xxx_clearl(stat, pm->irqstat);
 410 }
 411
 412 static void stmp3xxx_pin_mask_irq(unsigned irq)
 413 {
 414         struct stmp3xxx_pinmux_bank *pm;
 415         unsigned gpio;
 416
 417         stmp3xxx_irq_to_gpio(irq, &pm, &gpio);
 418         stmp3xxx_clearl(1 << gpio, pm->irqen);
 419         stmp3xxx_clearl(1 << gpio, pm->pin2irq);
 420 }
 421
 422 static void stmp3xxx_pin_unmask_irq(unsigned irq)
 423 {
 424         struct stmp3xxx_pinmux_bank *pm;
 425         unsigned gpio;
 426
 427         stmp3xxx_irq_to_gpio(irq, &pm, &gpio);
 428         stmp3xxx_setl(1 << gpio, pm->irqen);
 429         stmp3xxx_setl(1 << gpio, pm->pin2irq);
 430 }
 431
 432 static inline
 433 struct stmp3xxx_pinmux_bank *to_pinmux_bank(struct gpio_chip *chip)
 434 {
 435         return container_of(chip, struct stmp3xxx_pinmux_bank, chip);
 436 }
 437
 438 static int stmp3xxx_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 439 {
 440         struct stmp3xxx_pinmux_bank *pm = to_pinmux_bank(chip);
 441         return pm->virq + offset;
 442 }
 443
 444 static int stmp3xxx_gpio_get(struct gpio_chip *chip, unsigned offset)
 445 {
 446         struct stmp3xxx_pinmux_bank *pm = to_pinmux_bank(chip);
 447         unsigned v;
 448
 449         v = __raw_readl(pm->hw_gpio_in) & (1 << offset);
 450         return v ? 1 : 0;
 451 }
 452
 453 static void stmp3xxx_gpio_set(struct gpio_chip *chip, unsigned offset, int v)
 454 {
 455         struct stmp3xxx_pinmux_bank *pm = to_pinmux_bank(chip);
 456
 457         if (v)
 458                 stmp3xxx_setl(1 << offset, pm->hw_gpio_out);
 459         else
 460                 stmp3xxx_clearl(1 << offset, pm->hw_gpio_out);
 461 }
 462
 463 static int stmp3xxx_gpio_output(struct gpio_chip *chip, unsigned offset, int v)
 464 {
 465         struct stmp3xxx_pinmux_bank *pm = to_pinmux_bank(chip);
 466
 467         stmp3xxx_setl(1 << offset, pm->hw_gpio_doe);
 468         stmp3xxx_gpio_set(chip, offset, v);
 469         return 0;
 470 }
 471
 472 static int stmp3xxx_gpio_input(struct gpio_chip *chip, unsigned offset)
 473 {
 474         struct stmp3xxx_pinmux_bank *pm = to_pinmux_bank(chip);
 475
 476         stmp3xxx_clearl(1 << offset, pm->hw_gpio_doe);
 477         return 0;
 478 }
 479
 480 static int stmp3xxx_gpio_request(struct gpio_chip *chip, unsigned offset)
 481 {
 482         return stmp3xxx_request_pin(chip->base + offset, PIN_GPIO, "gpio");
 483 }
 484
 485 static void stmp3xxx_gpio_free(struct gpio_chip *chip, unsigned offset)
 486 {
 487         stmp3xxx_release_pin(chip->base + offset, "gpio");
 488 }
 489
 490 static void stmp3xxx_gpio_irq(u32 irq, struct irq_desc *desc)
 491 {
 492         struct stmp3xxx_pinmux_bank *pm = get_irq_data(irq);
 493         int gpio_irq = pm->virq;
 494         u32 stat = __raw_readl(pm->irqstat);
 495
 496         while (stat) {
 497                 if (stat & 1)
 498                         irq_desc[gpio_irq].handle_irq(gpio_irq,
 499                                 &irq_desc[gpio_irq]);
 500                 gpio_irq++;
 501                 stat >>= 1;
 502         }
 503 }
 504
 505 static struct irq_chip gpio_irq_chip = {
 506         .ack    = stmp3xxx_pin_ack_irq,
 507         .mask   = stmp3xxx_pin_mask_irq,
 508         .unmask = stmp3xxx_pin_unmask_irq,
 509         .set_type = stmp3xxx_set_irqtype,
 510 };
 511
 512 int __init stmp3xxx_pinmux_init(int virtual_irq_start)
 513 {
 514         int b, r = 0;
 515         struct stmp3xxx_pinmux_bank *pm;
 516         int virq;
 517
 518         for (b = 0; b < 3; b++) {
 519                 /* only banks 0,1,2 are allowed to GPIO */
 520                 pm = pinmux_banks + b;
 521                 pm->chip.base = 32 * b;
 522                 pm->chip.ngpio = 32;
 523                 pm->chip.owner = THIS_MODULE;
 524                 pm->chip.can_sleep = 1;
 525                 pm->chip.exported = 1;
 526                 pm->chip.to_irq = stmp3xxx_gpio_to_irq;
 527                 pm->chip.direction_input = stmp3xxx_gpio_input;
 528                 pm->chip.direction_output = stmp3xxx_gpio_output;
 529                 pm->chip.get = stmp3xxx_gpio_get;
 530                 pm->chip.set = stmp3xxx_gpio_set;
 531                 pm->chip.request = stmp3xxx_gpio_request;
 532                 pm->chip.free = stmp3xxx_gpio_free;
 533                 pm->virq = virtual_irq_start + b * 32;
 534
 535                 for (virq = pm->virq; virq < pm->virq; virq++) {
 536                         gpio_irq_chip.mask(virq);
 537                         set_irq_chip(virq, &gpio_irq_chip);
 538                         set_irq_handler(virq, handle_level_irq);
 539                         set_irq_flags(virq, IRQF_VALID);
 540                 }
 541                 r = gpiochip_add(&pm->chip);
 542                 if (r < 0)
 543                         break;
 544                 set_irq_chained_handler(pm->irq, stmp3xxx_gpio_irq);
 545                 set_irq_data(pm->irq, pm);
 546         }
 547         return r;
 548 }
 549
 550 MODULE_AUTHOR("Vladislav Buzov");
 551 MODULE_LICENSE("GPL");