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