target/linux/brcm63xx/patches-2.6.35/211-gen-74x164-gpio-chip-driver.patch

   1 --- a/drivers/gpio/Kconfig
   2 +++ b/drivers/gpio/Kconfig
   3 @@ -321,6 +321,14 @@ config GPIO_MC33880
   4           SPI driver for Freescale MC33880 high-side/low-side switch.
   5           This provides GPIO interface supporting inputs and outputs.
   6
   7 +config GPIO_74X164
   8 +       tristate "74x164 serial-in/parallel-out 8-bits shift register"
   9 +       depends on SPI_MASTER
  10 +       help
  11 +         Platform driver for 74x164 compatible serial-in/parallel-out
  12 +         8-outputs shift registers. This driver can be used to provide access
  13 +         to more gpio outputs.
  14 +
  15  comment "AC97 GPIO expanders:"
  16
  17  config GPIO_UCB1400
  18 --- a/drivers/gpio/Makefile
  19 +++ b/drivers/gpio/Makefile
  20 @@ -17,6 +17,7 @@ obj-$(CONFIG_GPIO_MAX7301)    += max7301.o
  21  obj-$(CONFIG_GPIO_MAX732X)     += max732x.o
  22  obj-$(CONFIG_GPIO_MC33880)     += mc33880.o
  23  obj-$(CONFIG_GPIO_MCP23S08)    += mcp23s08.o
  24 +obj-$(CONFIG_GPIO_74X164)      += 74x164.o
  25  obj-$(CONFIG_GPIO_PCA953X)     += pca953x.o
  26  obj-$(CONFIG_GPIO_PCF857X)     += pcf857x.o
  27  obj-$(CONFIG_GPIO_PL061)       += pl061.o
  28 --- /dev/null
  29 +++ b/drivers/gpio/nxp_74hc164.c
  30 @@ -0,0 +1,227 @@
  31 +/*
  32 + *  NXP 74HC164 - output expander  GPIO driver
  33 + *
  34 + *  Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
  35 + *  Copyright (C) 2010 Miguel Gaio <miguel.gaio@efixo.com>
  36 + *
  37 + *  This program is free software; you can redistribute it and/or modify
  38 + *  it under the terms of the GNU General Public License version 2 as
  39 + *  published by the Free Software Foundation.
  40 + *
  41 + *  Copy from nxp_74hc153.c code
  42 + */
  43 +
  44 +#include <linux/module.h>
  45 +#include <linux/init.h>
  46 +#include <linux/gpio.h>
  47 +#include <linux/bitops.h>
  48 +#include <linux/slab.h>
  49 +#include <linux/platform_device.h>
  50 +#include <linux/nxp_74hc164.h>
  51 +
  52 +#define NXP_74HC164_NUM_GPIOS  8
  53 +
  54 +struct nxp_74hc164_chip {
  55 +       struct device           *parent;
  56 +       struct gpio_chip        gpio_chip;
  57 +       struct mutex            lock;
  58 +       long                    mask;
  59 +};
  60 +
  61 +static void nxp_74hc164_set_value(struct gpio_chip *, unsigned, int);
  62 +
  63 +static struct nxp_74hc164_chip *gpio_to_nxp(struct gpio_chip *gc)
  64 +{
  65 +       return container_of(gc, struct nxp_74hc164_chip, gpio_chip);
  66 +}
  67 +
  68 +static int nxp_74hc164_direction_input(struct gpio_chip *gc, unsigned offset)
  69 +{
  70 +       WARN_ON(1);
  71 +       return -EINVAL;
  72 +}
  73 +
  74 +static int nxp_74hc164_direction_output(struct gpio_chip *gc,
  75 +                                       unsigned offset, int val)
  76 +{
  77 +       nxp_74hc164_set_value(gc, offset, val);
  78 +       return 0;
  79 +}
  80 +
  81 +static int nxp_74hc164_get_value(struct gpio_chip *gc, unsigned offset)
  82 +{
  83 +       struct nxp_74hc164_chip *nxp = gpio_to_nxp(gc);
  84 +       int ret;
  85 +
  86 +       mutex_lock(&nxp->lock);
  87 +       ret = test_bit(offset, &nxp->mask);
  88 +       mutex_unlock(&nxp->lock);
  89 +
  90 +       return ret;
  91 +}
  92 +
  93 +static void nxp_74hc164_set_value(struct gpio_chip *gc,
  94 +                                 unsigned offset, int val)
  95 +{
  96 +       struct nxp_74hc164_chip *nxp;
  97 +       struct nxp_74hc164_platform_data *pdata;
  98 +       long mask;
  99 +       int refresh;
 100 +       int i;
 101 +
 102 +       nxp = gpio_to_nxp(gc);
 103 +       pdata = nxp->parent->platform_data;
 104 +
 105 +       mutex_lock(&nxp->lock);
 106 +       if (val)
 107 +               refresh = (test_and_set_bit(offset, &nxp->mask) != val);
 108 +       else
 109 +               refresh = (test_and_clear_bit(offset, &nxp->mask) != val);
 110 +
 111 +       if (refresh) {
 112 +               mask = nxp->mask;
 113 +               for (i = 8; i > 0; --i, mask <<= 1) {
 114 +                       gpio_set_value(pdata->gpio_pin_data, mask & 0x80);
 115 +                       gpio_set_value(pdata->gpio_pin_clk, 1);
 116 +                       gpio_set_value(pdata->gpio_pin_clk, 0);
 117 +               }
 118 +       }
 119 +       mutex_unlock(&nxp->lock);
 120 +}
 121 +
 122 +static int __devinit nxp_74hc164_probe(struct platform_device *pdev)
 123 +{
 124 +       struct nxp_74hc164_platform_data *pdata;
 125 +       struct nxp_74hc164_chip *nxp;
 126 +       struct gpio_chip *gc;
 127 +       int err;
 128 +
 129 +       pdata = pdev->dev.platform_data;
 130 +       if (pdata == NULL) {
 131 +               dev_dbg(&pdev->dev, "no platform data specified\n");
 132 +               return -EINVAL;
 133 +       }
 134 +
 135 +       nxp = kzalloc(sizeof(struct nxp_74hc164_chip), GFP_KERNEL);
 136 +       if (nxp == NULL) {
 137 +               dev_err(&pdev->dev, "no memory for private data\n");
 138 +               return -ENOMEM;
 139 +       }
 140 +
 141 +       err = gpio_request(pdata->gpio_pin_clk, dev_name(&pdev->dev));
 142 +       if (err) {
 143 +               dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
 144 +                       pdata->gpio_pin_clk, err);
 145 +               goto err_free_nxp;
 146 +       }
 147 +
 148 +       err = gpio_request(pdata->gpio_pin_data, dev_name(&pdev->dev));
 149 +       if (err) {
 150 +               dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
 151 +                       pdata->gpio_pin_data, err);
 152 +               goto err_free_clk;
 153 +       }
 154 +
 155 +       err = gpio_direction_output(pdata->gpio_pin_clk, 0);
 156 +       if (err) {
 157 +               dev_err(&pdev->dev,
 158 +                       "unable to set direction of gpio %u, err=%d\n",
 159 +                       pdata->gpio_pin_clk, err);
 160 +               goto err_free_data;
 161 +       }
 162 +
 163 +       err = gpio_direction_output(pdata->gpio_pin_data, 0);
 164 +       if (err) {
 165 +               dev_err(&pdev->dev,
 166 +                       "unable to set direction of gpio %u, err=%d\n",
 167 +                       pdata->gpio_pin_data, err);
 168 +               goto err_free_data;
 169 +       }
 170 +
 171 +       nxp->parent = &pdev->dev;
 172 +       mutex_init(&nxp->lock);
 173 +
 174 +       gc = &nxp->gpio_chip;
 175 +
 176 +       gc->direction_input  = nxp_74hc164_direction_input;
 177 +       gc->direction_output = nxp_74hc164_direction_output;
 178 +       gc->get = nxp_74hc164_get_value;
 179 +       gc->set = nxp_74hc164_set_value;
 180 +       gc->can_sleep = 1;
 181 +
 182 +       gc->base = pdata->gpio_base;
 183 +       gc->ngpio = NXP_74HC164_NUM_GPIOS;
 184 +       gc->label = dev_name(nxp->parent);
 185 +       gc->dev = nxp->parent;
 186 +       gc->owner = THIS_MODULE;
 187 +
 188 +       err = gpiochip_add(&nxp->gpio_chip);
 189 +       if (err) {
 190 +               dev_err(&pdev->dev, "unable to add gpio chip, err=%d\n", err);
 191 +               goto err_free_data;
 192 +       }
 193 +
 194 +       platform_set_drvdata(pdev, nxp);
 195 +       return 0;
 196 +
 197 + err_free_data:
 198 +       gpio_free(pdata->gpio_pin_data);
 199 + err_free_clk:
 200 +       gpio_free(pdata->gpio_pin_clk);
 201 + err_free_nxp:
 202 +       kfree(nxp);
 203 +       return err;
 204 +}
 205 +
 206 +static int nxp_74hc164_remove(struct platform_device *pdev)
 207 +{
 208 +       struct nxp_74hc164_chip *nxp = platform_get_drvdata(pdev);
 209 +       struct nxp_74hc164_platform_data *pdata = pdev->dev.platform_data;
 210 +
 211 +       if (nxp) {
 212 +               int err;
 213 +
 214 +               err = gpiochip_remove(&nxp->gpio_chip);
 215 +               if (err) {
 216 +                       dev_err(&pdev->dev,
 217 +                               "unable to remove gpio chip, err=%d\n",
 218 +                               err);
 219 +                       return err;
 220 +               }
 221 +
 222 +               gpio_free(pdata->gpio_pin_clk);
 223 +               gpio_free(pdata->gpio_pin_data);
 224 +
 225 +               kfree(nxp);
 226 +               platform_set_drvdata(pdev, NULL);
 227 +       }
 228 +
 229 +       return 0;
 230 +}
 231 +
 232 +static struct platform_driver nxp_74hc164_driver = {
 233 +       .probe          = nxp_74hc164_probe,
 234 +       .remove         = __devexit_p(nxp_74hc164_remove),
 235 +       .driver = {
 236 +               .name   = NXP_74HC164_DRIVER_NAME,
 237 +               .owner  = THIS_MODULE,
 238 +       },
 239 +};
 240 +
 241 +static int __init nxp_74hc164_init(void)
 242 +{
 243 +       return platform_driver_register(&nxp_74hc164_driver);
 244 +}
 245 +subsys_initcall(nxp_74hc164_init);
 246 +
 247 +static void __exit nxp_74hc164_exit(void)
 248 +{
 249 +       platform_driver_unregister(&nxp_74hc164_driver);
 250 +}
 251 +module_exit(nxp_74hc164_exit);
 252 +
 253 +MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
 254 +MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>");
 255 +MODULE_DESCRIPTION("GPIO expander driver for NXP 74HC164");
 256 +MODULE_LICENSE("GPL v2");
 257 +MODULE_ALIAS("platform:" NXP_74HC164_DRIVER_NAME);
 258 --- /dev/null
 259 +++ b/drivers/gpio/74x164.c
 260 @@ -0,0 +1,184 @@
 261 +/*
 262 + *  74Hx164 - Generic serial-in/parallel-out 8-bits shift register GPIO driver
 263 + *
 264 + *  Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
 265 + *  Copyright (C) 2010 Miguel Gaio <miguel.gaio@efixo.com>
 266 + *
 267 + *  This program is free software; you can redistribute it and/or modify
 268 + *  it under the terms of the GNU General Public License version 2 as
 269 + *  published by the Free Software Foundation.
 270 + */
 271 +
 272 +#include <linux/init.h>
 273 +#include <linux/mutex.h>
 274 +#include <linux/spi/spi.h>
 275 +#include <linux/spi/74x164.h>
 276 +#include <linux/gpio.h>
 277 +#include <linux/slab.h>
 278 +
 279 +#define GEN_74X164_GPIO_COUNT  8
 280 +
 281 +
 282 +struct gen_74x164_chip {
 283 +       struct spi_device       *spi;
 284 +       struct gpio_chip        gpio_chip;
 285 +       struct mutex            lock;
 286 +       u8                      port_config;
 287 +};
 288 +
 289 +static void gen_74x164_set_value(struct gpio_chip *, unsigned, int);
 290 +
 291 +static struct gen_74x164_chip *gpio_to_chip(struct gpio_chip *gc)
 292 +{
 293 +       return container_of(gc, struct gen_74x164_chip, gpio_chip);
 294 +}
 295 +
 296 +static int __gen_74x164_write_config(struct gen_74x164_chip *chip)
 297 +{
 298 +       return spi_write(chip->spi,
 299 +                        &chip->port_config, sizeof(chip->port_config));
 300 +}
 301 +
 302 +static int gen_74x164_direction_output(struct gpio_chip *gc,
 303 +               unsigned offset, int val)
 304 +{
 305 +       gen_74x164_set_value(gc, offset, val);
 306 +       return 0;
 307 +}
 308 +
 309 +static int gen_74x164_get_value(struct gpio_chip *gc, unsigned offset)
 310 +{
 311 +       struct gen_74x164_chip *chip = gpio_to_chip(gc);
 312 +       int ret;
 313 +
 314 +       mutex_lock(&chip->lock);
 315 +       ret = (chip->port_config >> offset) & 0x1;
 316 +       mutex_unlock(&chip->lock);
 317 +
 318 +       return ret;
 319 +}
 320 +
 321 +static void gen_74x164_set_value(struct gpio_chip *gc,
 322 +               unsigned offset, int val)
 323 +{
 324 +       struct gen_74x164_chip *chip = gpio_to_chip(gc);
 325 +       bool refresh;
 326 +
 327 +       mutex_lock(&chip->lock);
 328 +       if (val)
 329 +               chip->port_config |= (1 << offset);
 330 +       else
 331 +               chip->port_config &= ~(1 << offset);
 332 +
 333 +       __gen_74x164_write_config(chip);
 334 +       mutex_unlock(&chip->lock);
 335 +}
 336 +
 337 +static int __devinit gen_74x164_probe(struct spi_device *spi)
 338 +{
 339 +       struct gen_74x164_chip *chip;
 340 +       struct gen_74x164_chip_platform_data *pdata;
 341 +       int ret;
 342 +
 343 +       pdata = spi->dev.platform_data;
 344 +       if (!pdata || !pdata->base) {
 345 +               dev_dbg(&spi->dev, "incorrect or missing platform data\n");
 346 +               return -EINVAL;
 347 +       }
 348 +
 349 +       /*
 350 +        * bits_per_word cannot be configured in platform data
 351 +        */
 352 +       spi->bits_per_word = 8;
 353 +
 354 +       ret = spi_setup(spi);
 355 +       if (ret < 0)
 356 +               return ret;
 357 +
 358 +       chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 359 +       if (!chip)
 360 +               return -ENOMEM;
 361 +
 362 +       mutex_init(&chip->lock);
 363 +
 364 +       dev_set_drvdata(&spi->dev, chip);
 365 +
 366 +       chip->spi = spi;
 367 +
 368 +       chip->gpio_chip.label = GEN_74X164_DRIVER_NAME,
 369 +               chip->gpio_chip.direction_output = gen_74x164_direction_output;
 370 +       chip->gpio_chip.get = gen_74x164_get_value;
 371 +       chip->gpio_chip.set = gen_74x164_set_value;
 372 +       chip->gpio_chip.base = pdata->base;
 373 +       chip->gpio_chip.ngpio = GEN_74X164_GPIO_COUNT;
 374 +       chip->gpio_chip.can_sleep = 1;
 375 +       chip->gpio_chip.dev = &spi->dev;
 376 +       chip->gpio_chip.owner = THIS_MODULE;
 377 +
 378 +       ret = __gen_74x164_write_config(chip);
 379 +       if (ret) {
 380 +               dev_err(&spi->dev, "Failed writing: %d\n", ret);
 381 +               goto exit_destroy;
 382 +       }
 383 +
 384 +       ret = gpiochip_add(&chip->gpio_chip);
 385 +       if (ret)
 386 +               goto exit_destroy;
 387 +
 388 +       return ret;
 389 +
 390 +exit_destroy:
 391 +       dev_set_drvdata(&spi->dev, NULL);
 392 +       mutex_destroy(&chip->lock);
 393 +       kfree(chip);
 394 +       return ret;
 395 +}
 396 +
 397 +static int gen_74x164_remove(struct spi_device *spi)
 398 +{
 399 +       struct gen_74x164_chip *chip;
 400 +       int ret;
 401 +
 402 +       chip = dev_get_drvdata(&spi->dev);
 403 +       if (chip == NULL)
 404 +               return -ENODEV;
 405 +
 406 +       dev_set_drvdata(&spi->dev, NULL);
 407 +
 408 +       ret = gpiochip_remove(&chip->gpio_chip);
 409 +       if (!ret) {
 410 +               mutex_destroy(&chip->lock);
 411 +               kfree(chip);
 412 +       } else
 413 +               dev_err(&spi->dev, "Failed to remove the GPIO controller: %d\n",
 414 +                               ret);
 415 +
 416 +       return ret;
 417 +}
 418 +
 419 +static struct spi_driver gen_74x164_driver = {
 420 +       .driver = {
 421 +               .name           = GEN_74X164_DRIVER_NAME,
 422 +               .owner          = THIS_MODULE,
 423 +       },
 424 +       .probe          = gen_74x164_probe,
 425 +       .remove         = __devexit_p(gen_74x164_remove),
 426 +};
 427 +
 428 +static int __init gen_74x164_init(void)
 429 +{
 430 +       return spi_register_driver(&gen_74x164_driver);
 431 +}
 432 +subsys_initcall(gen_74x164_init);
 433 +
 434 +static void __exit gen_74x164_exit(void)
 435 +{
 436 +       spi_unregister_driver(&gen_74x164_driver);
 437 +}
 438 +module_exit(gen_74x164_exit);
 439 +
 440 +MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
 441 +MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>");
 442 +MODULE_DESCRIPTION("GPIO expander driver for 74X164 8-bits shift register");
 443 +MODULE_LICENSE("GPL v2");
 444 +
 445 --- /dev/null
 446 +++ b/include/linux/spi/74x164.h
 447 @@ -0,0 +1,11 @@
 448 +#ifndef LINUX_SPI_74X164_H
 449 +#define LINUX_SPI_74X164_H
 450 +
 451 +#define GEN_74X164_DRIVER_NAME "74x164"
 452 +
 453 +struct gen_74x164_chip_platform_data {
 454 +       /* number assigned to the first GPIO */
 455 +       unsigned        base;
 456 +};
 457 +
 458 +#endif