target/linux/pxa/patches-2.6.21/011-proc-gpio.patch

   1 Index: linux-2.6.21gum/arch/arm/Kconfig
   2 ===================================================================
   3 --- linux-2.6.21gum.orig/arch/arm/Kconfig
   4 +++ linux-2.6.21gum/arch/arm/Kconfig
   5 @@ -505,6 +505,8 @@ config PCI_HOST_VIA82C505
   6         depends on PCI && ARCH_SHARK
   7         default y
   8
   9 +source "drivers/gpio/Kconfig"
  10 +
  11  source "drivers/pci/Kconfig"
  12
  13  source "drivers/pcmcia/Kconfig"
  14 Index: linux-2.6.21gum/drivers/Makefile
  15 ===================================================================
  16 --- linux-2.6.21gum.orig/drivers/Makefile
  17 +++ linux-2.6.21gum/drivers/Makefile
  18 @@ -81,3 +81,4 @@ obj-$(CONFIG_GENERIC_TIME)    += clocksourc
  19  obj-$(CONFIG_DMA_ENGINE)       += dma/
  20  obj-$(CONFIG_HID)              += hid/
  21  obj-$(CONFIG_PPC_PS3)          += ps3/
  22 +obj-$(CONFIG_PROC_GPIO)                += gpio/
  23 Index: linux-2.6.21gum/drivers/gpio/Kconfig
  24 ===================================================================
  25 --- /dev/null
  26 +++ linux-2.6.21gum/drivers/gpio/Kconfig
  27 @@ -0,0 +1,12 @@
  28 +config PROC_GPIO
  29 +       tristate "GPIO /proc interface"
  30 +       depends on PXA25x || PXA27x
  31 +       help
  32 +         This enables an interface under /proc/gpio which allows reading or setting
  33 +         of any GPIO, and also changing the GPIO alt function mode of any line.
  34 +
  35 +config PROC_GPIO_DEBUG
  36 +       boolean "Enable /proc/gpio debug logging"
  37 +       depends on PROC_GPIO
  38 +       help
  39 +         This enables printk logging of activity done through /proc/gpio
  40 Index: linux-2.6.21gum/drivers/gpio/Makefile
  41 ===================================================================
  42 --- /dev/null
  43 +++ linux-2.6.21gum/drivers/gpio/Makefile
  44 @@ -0,0 +1,3 @@
  45 +# Expose GPIOs under /proc
  46 +obj-$(CONFIG_PROC_GPIO)                        += proc_gpio.o
  47 +
  48 Index: linux-2.6.21gum/drivers/gpio/proc_gpio.c
  49 ===================================================================
  50 --- /dev/null
  51 +++ linux-2.6.21gum/drivers/gpio/proc_gpio.c
  52 @@ -0,0 +1,276 @@
  53 +/*
  54 + *
  55 + *  PXA25x GPIOs exposed under /proc for reading and writing
  56 + *  They will show up under /proc/gpio/NN
  57 + *
  58 + *  Based on patch 1773/1 in the arm kernel patch repository at arm.linux.co.uk
  59 + *
  60 + */
  61 +
  62 +#include <linux/module.h>
  63 +#include <linux/init.h>
  64 +#include <linux/proc_fs.h>
  65 +#include <linux/string.h>
  66 +#include <linux/ctype.h>
  67 +
  68 +#include <asm/hardware.h>
  69 +#include <asm/arch/pxa-regs.h>
  70 +#include <asm/uaccess.h>
  71 +
  72 +static struct proc_dir_entry *proc_gpio_parent;
  73 +static struct proc_dir_entry *proc_gpios[PXA_LAST_GPIO + 1];
  74 +
  75 +typedef struct
  76 +{
  77 +       int     gpio;
  78 +       char    name[32];
  79 +} gpio_summary_type;
  80 +
  81 +static gpio_summary_type gpio_summaries[PXA_LAST_GPIO + 1];
  82 +
  83 +static int proc_gpio_write(struct file *file, const char __user *buf,
  84 +                           unsigned long count, void *data)
  85 +{
  86 +       char *cur, lbuf[count + 1];
  87 +       gpio_summary_type *summary = data;
  88 +       u32 altfn, direction, setclear, gafr;
  89 +
  90 +       if (!capable(CAP_SYS_ADMIN))
  91 +               return -EACCES;
  92 +
  93 +       memset(lbuf, 0, count + 1);
  94 +
  95 +       if (copy_from_user(lbuf, buf, count))
  96 +               return -EFAULT;
  97 +
  98 +       cur = lbuf;
  99 +
 100 +       // Initialize to current state
 101 +       altfn = ((GAFR(summary->gpio) >> ((summary->gpio & 0x0f) << 0x01)) & 0x03);
 102 +       direction = GPDR(summary->gpio) & GPIO_bit(summary->gpio);
 103 +       setclear = GPLR(summary->gpio) & GPIO_bit(summary->gpio);
 104 +       while(1)
 105 +       {
 106 +               // We accept options: {GPIO|AF1|AF2|AF3}, {set|clear}, {in|out}
 107 +               // Anything else is an error
 108 +               while(cur[0] && (isspace(cur[0]) || ispunct(cur[0]))) cur = &(cur[1]);
 109 +
 110 +               if('\0' == cur[0]) break;
 111 +
 112 +               // Ok, so now we're pointing at the start of something
 113 +               switch(cur[0])
 114 +               {
 115 +                       case 'G':
 116 +                               // Check that next is "PIO" -- '\0' will cause safe short-circuit if end of buf
 117 +                               if(!(cur[1] == 'P' && cur[2] == 'I' && cur[3] == 'O')) goto parse_error;
 118 +                               // Ok, so set this GPIO to GPIO (non-ALT) function
 119 +                               altfn = 0;
 120 +                               cur = &(cur[4]);
 121 +                               break;
 122 +                       case 'A':
 123 +                               if(!(cur[1] == 'F' && cur[2] >= '1' && cur[2] <= '3')) goto parse_error;
 124 +                               altfn = cur[2] - '0';
 125 +                               cur = &(cur[3]);
 126 +                               break;
 127 +                       case 's':
 128 +                               if(!(cur[1] == 'e' && cur[2] == 't')) goto parse_error;
 129 +                               setclear = 1;
 130 +                               cur = &(cur[3]);
 131 +                               break;
 132 +                       case 'c':
 133 +                               if(!(cur[1] == 'l' && cur[2] == 'e' && cur[3] == 'a' && cur[4] == 'r')) goto parse_error;
 134 +                               setclear = 0;
 135 +                               cur = &(cur[5]);
 136 +                               break;
 137 +                       case 'i':
 138 +                               if(!(cur[1] == 'n')) goto parse_error;
 139 +                               direction = 0;
 140 +                               cur = &(cur[2]);
 141 +                               break;
 142 +                       case 'o':
 143 +                               if(!(cur[1] == 'u' && cur[2] == 't')) goto parse_error;
 144 +                               direction = 1;
 145 +                               cur = &(cur[3]);
 146 +                               break;
 147 +                       default: goto parse_error;
 148 +               }
 149 +       }
 150 +       // Ok, now set gpio mode and value
 151 +       if(direction)
 152 +               GPDR(summary->gpio) |= GPIO_bit(summary->gpio);
 153 +       else
 154 +               GPDR(summary->gpio) &= ~GPIO_bit(summary->gpio);
 155 +
 156 +       gafr = GAFR(summary->gpio) & ~(0x3 << (((summary->gpio) & 0xf)*2));
 157 +       GAFR(summary->gpio) = gafr |  (altfn  << (((summary->gpio) & 0xf)*2));
 158 +
 159 +       if(direction && !altfn)
 160 +       {
 161 +               if(setclear) GPSR(summary->gpio) = GPIO_bit(summary->gpio);
 162 +               else GPCR(summary->gpio) = GPIO_bit(summary->gpio);
 163 +       }
 164 +
 165 +#ifdef CONFIG_PROC_GPIO_DEBUG
 166 +       printk(KERN_INFO "Set (%s,%s,%s) via /proc/gpio/%s\n",altfn ? (altfn == 1 ? "AF1" : (altfn == 2 ? "AF2" : "AF3")) : "GPIO",
 167 +                               direction ? "out" : "in",
 168 +                               setclear ? "set" : "clear",
 169 +                               summary->name);
 170 +#endif
 171 +
 172 +       return count;
 173 +
 174 +parse_error:
 175 +       printk(KERN_CRIT "Parse error: Expect \"[GPIO|AF1|AF2|AF3]|[set|clear]|[in|out] ...\"\n");
 176 +       return -EINVAL;
 177 +}
 178 +
 179 +static int proc_gpio_read(char *page, char **start, off_t off,
 180 +                       int count, int *eof, void *data)
 181 +{
 182 +       char *p = page;
 183 +       gpio_summary_type *summary = data;
 184 +       int len, i, af;
 185 +       i = summary->gpio;
 186 +
 187 +       p += sprintf(p, "%d\t%s\t%s\t%s\n", i,
 188 +                       (af = ((GAFR(i) >> ((i & 0x0f) << 0x01)) & 0x03)) ? (af == 1 ? "AF1" : (af == 2 ? "AF2" : "AF3")) : "GPIO",
 189 +                       (GPDR(i) & GPIO_bit(i)) ? "out" : "in",
 190 +                       (GPLR(i) & GPIO_bit(i)) ? "set" : "clear");
 191 +
 192 +       len = (p - page) - off;
 193 +
 194 +       if(len < 0)
 195 +       {
 196 +               len = 0;
 197 +       }
 198 +
 199 +       *eof = (len <= count) ? 1 : 0;
 200 +       *start = page + off;
 201 +
 202 +       return len;
 203 +}
 204 +
 205 +
 206 +#ifdef CONFIG_PXA25x
 207 +static const char const *GAFR_DESC[] = { "GAFR0_L", "GAFR0_U", "GAFR1_L", "GAFR1_U", "GAFR2_L", "GAFR2_U" };
 208 +#elif defined(CONFIG_PXA27x)
 209 +static const char const *GAFR_DESC[] = { "GAFR0_L", "GAFR0_U", "GAFR1_L", "GAFR1_U", "GAFR2_L", "GAFR2_U", "GAFR3_L", "GAFR3_U" };
 210 +#endif
 211 +
 212 +static int proc_gafr_read(char *page, char **start, off_t off,
 213 +                       int count, int *eof, void *data)
 214 +{
 215 +       char *p = page;
 216 +       int i, len;
 217 +
 218 +       for(i=0; i<ARRAY_SIZE(GAFR_DESC); i++)
 219 +       {
 220 +               p += sprintf(p, "%s: %08x\n", GAFR_DESC[i], GAFR(i*16));
 221 +       }
 222 +
 223 +       len = (p - page) - off;
 224 +
 225 +       if(len < 0)
 226 +       {
 227 +               len = 0;
 228 +       }
 229 +
 230 +       *eof = (len <= count) ? 1 : 0;
 231 +       *start = page + off;
 232 +
 233 +       return len;
 234 +}
 235 +
 236 +static int proc_gpdr_read(char *page, char **start, off_t off,
 237 +                       int count, int *eof, void *data)
 238 +{
 239 +       char *p = page;
 240 +       int i, len;
 241 +
 242 +       for(i=0; i<=2; i++)
 243 +       {
 244 +               p += sprintf(p, "GPDR%d: %08x\n", i, GPDR(i * 32));
 245 +       }
 246 +
 247 +       len = (p - page) - off;
 248 +
 249 +       if(len < 0)
 250 +       {
 251 +               len = 0;
 252 +       }
 253 +
 254 +       *eof = (len <= count) ? 1 : 0;
 255 +       *start = page + off;
 256 +
 257 +       return len;
 258 +}
 259 +
 260 +static int proc_gplr_read(char *page, char **start, off_t off,
 261 +                       int count, int *eof, void *data)
 262 +{
 263 +       char *p = page;
 264 +       int i, len;
 265 +
 266 +       for(i=0; i<=2; i++)
 267 +       {
 268 +               p += sprintf(p, "GPLR%d: %08x\n", i, GPLR(i * 32));
 269 +       }
 270 +
 271 +       len = (p - page) - off;
 272 +
 273 +       if(len < 0)
 274 +       {
 275 +               len = 0;
 276 +       }
 277 +
 278 +       *eof = (len <= count) ? 1 : 0;
 279 +       *start = page + off;
 280 +
 281 +       return len;
 282 +}
 283 +
 284 +static int __init gpio_init(void)
 285 +{
 286 +       int i;
 287 +
 288 +       proc_gpio_parent = create_proc_entry("gpio", S_IFDIR | S_IRUGO | S_IXUGO, NULL);
 289 +       if(!proc_gpio_parent) return 0;
 290 +
 291 +       for(i=0; i < (PXA_LAST_GPIO+1); i++)
 292 +       {
 293 +               gpio_summaries[i].gpio = i;
 294 +               sprintf(gpio_summaries[i].name, "GPIO%d", i);
 295 +               proc_gpios[i] = create_proc_entry(gpio_summaries[i].name, 0644, proc_gpio_parent);
 296 +               if(proc_gpios[i])
 297 +               {
 298 +                       proc_gpios[i]->data = &gpio_summaries[i];
 299 +                       proc_gpios[i]->read_proc = proc_gpio_read;
 300 +                       proc_gpios[i]->write_proc = proc_gpio_write;
 301 +               }
 302 +       }
 303 +
 304 +       create_proc_read_entry("GAFR", 0444, proc_gpio_parent, proc_gafr_read, NULL);
 305 +       create_proc_read_entry("GPDR", 0444, proc_gpio_parent, proc_gpdr_read, NULL);
 306 +       create_proc_read_entry("GPLR", 0444, proc_gpio_parent, proc_gplr_read, NULL);
 307 +
 308 +       return 0;
 309 +}
 310 +
 311 +static void gpio_exit(void)
 312 +{
 313 +       int i;
 314 +
 315 +       remove_proc_entry("GAFR", proc_gpio_parent);
 316 +       remove_proc_entry("GPDR", proc_gpio_parent);
 317 +       remove_proc_entry("GPLR", proc_gpio_parent);
 318 +
 319 +       for(i=0; i < (PXA_LAST_GPIO+1); i++)
 320 +       {
 321 +               if(proc_gpios[i]) remove_proc_entry(gpio_summaries[i].name, proc_gpio_parent);
 322 +       }
 323 +       if(proc_gpio_parent) remove_proc_entry("gpio", NULL);
 324 +}
 325 +
 326 +module_init(gpio_init);
 327 +module_exit(gpio_exit);
 328 +MODULE_LICENSE("GPL");