diff options
Diffstat (limited to 'packages/linux/gumstix-kernel-2.6.21/proc-gpio.patch')
| -rw-r--r-- | packages/linux/gumstix-kernel-2.6.21/proc-gpio.patch | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/packages/linux/gumstix-kernel-2.6.21/proc-gpio.patch b/packages/linux/gumstix-kernel-2.6.21/proc-gpio.patch new file mode 100644 index 0000000000..51c5c7242b --- /dev/null +++ b/packages/linux/gumstix-kernel-2.6.21/proc-gpio.patch @@ -0,0 +1,348 @@ +Index: linux-2.6.21gum/arch/arm/Kconfig +=================================================================== +--- linux-2.6.21gum.orig/arch/arm/Kconfig ++++ linux-2.6.21gum/arch/arm/Kconfig +@@ -505,6 +505,8 @@ config PCI_HOST_VIA82C505 + depends on PCI && ARCH_SHARK + default y + ++source "drivers/gpio/Kconfig" ++ + source "drivers/pci/Kconfig" + + source "drivers/pcmcia/Kconfig" +Index: linux-2.6.21gum/drivers/Makefile +=================================================================== +--- linux-2.6.21gum.orig/drivers/Makefile ++++ linux-2.6.21gum/drivers/Makefile +@@ -81,3 +81,4 @@ obj-$(CONFIG_GENERIC_TIME) += clocksourc + obj-$(CONFIG_DMA_ENGINE) += dma/ + obj-$(CONFIG_HID) += hid/ + obj-$(CONFIG_PPC_PS3) += ps3/ ++obj-$(CONFIG_PROC_GPIO) += gpio/ +Index: linux-2.6.21gum/drivers/gpio/Kconfig +=================================================================== +--- /dev/null ++++ linux-2.6.21gum/drivers/gpio/Kconfig +@@ -0,0 +1,12 @@ ++config PROC_GPIO ++ tristate "GPIO /proc interface" ++ depends on PXA25x || PXA27x ++ help ++ This enables an interface under /proc/gpio which allows reading or setting ++ of any GPIO, and also changing the GPIO alt function mode of any line. ++ ++config PROC_GPIO_DEBUG ++ boolean "Enable /proc/gpio debug logging" ++ depends on PROC_GPIO ++ help ++ This enables printk logging of activity done through /proc/gpio +Index: linux-2.6.21gum/drivers/gpio/Makefile +=================================================================== +--- /dev/null ++++ linux-2.6.21gum/drivers/gpio/Makefile +@@ -0,0 +1,3 @@ ++# Expose GPIOs under /proc ++obj-$(CONFIG_PROC_GPIO) += proc_gpio.o ++ +Index: linux-2.6.21gum/drivers/gpio/proc_gpio.c +=================================================================== +--- /dev/null ++++ linux-2.6.21gum/drivers/gpio/proc_gpio.c +@@ -0,0 +1,296 @@ ++/* ++ * ++ * PXA25x GPIOs exposed under /proc for reading and writing ++ * They will show up under /proc/gpio/NN ++ * ++ * Based on patch 1773/1 in the arm kernel patch repository at arm.linux.co.uk ++ * ++ */ ++ ++#include <linux/module.h> ++#include <linux/init.h> ++#include <linux/proc_fs.h> ++#include <linux/string.h> ++#include <linux/ctype.h> ++ ++#include <asm/hardware.h> ++#include <asm/arch/pxa-regs.h> ++#include <asm/uaccess.h> ++ ++static struct proc_dir_entry *proc_gpio_parent; ++static struct proc_dir_entry *proc_gpios[PXA_LAST_GPIO + 1]; ++ ++typedef struct ++{ ++ int gpio; ++ char name[32]; ++} gpio_summary_type; ++ ++static gpio_summary_type gpio_summaries[PXA_LAST_GPIO + 1]; ++ ++static int proc_gpio_write(struct file *file, const char __user *buf, ++ unsigned long count, void *data) ++{ ++ char *cur, lbuf[count + 1]; ++ gpio_summary_type *summary = data; ++ u32 altfn, direction, setclear, gafr; ++ ++ if (!capable(CAP_SYS_ADMIN)) ++ return -EACCES; ++ ++ memset(lbuf, 0, count + 1); ++ ++ if (copy_from_user(lbuf, buf, count)) ++ return -EFAULT; ++ ++ cur = lbuf; ++ ++ // Initialize to current state ++ altfn = ((GAFR(summary->gpio) >> ((summary->gpio & 0x0f) << 0x01)) & 0x03); ++ direction = GPDR(summary->gpio) & GPIO_bit(summary->gpio); ++ setclear = GPLR(summary->gpio) & GPIO_bit(summary->gpio); ++ while(1) ++ { ++ // We accept options: {GPIO|AF1|AF2|AF3}, {set|clear}, {in|out} ++ // Anything else is an error ++ while(cur[0] && (isspace(cur[0]) || ispunct(cur[0]))) cur = &(cur[1]); ++ ++ if('\0' == cur[0]) break; ++ ++ // Ok, so now we're pointing at the start of something ++ switch(cur[0]) ++ { ++ case 'G': ++ // Check that next is "PIO" -- '\0' will cause safe short-circuit if end of buf ++ if(!(cur[1] == 'P' && cur[2] == 'I' && cur[3] == 'O')) goto parse_error; ++ // Ok, so set this GPIO to GPIO (non-ALT) function ++ altfn = 0; ++ cur = &(cur[4]); ++ break; ++ case 'A': ++ if(!(cur[1] == 'F' && cur[2] >= '1' && cur[2] <= '3')) goto parse_error; ++ altfn = cur[2] - '0'; ++ cur = &(cur[3]); ++ break; ++ case 's': ++ if(!(cur[1] == 'e' && cur[2] == 't')) goto parse_error; ++ setclear = 1; ++ cur = &(cur[3]); ++ break; ++ case 'c': ++ if(!(cur[1] == 'l' && cur[2] == 'e' && cur[3] == 'a' && cur[4] == 'r')) goto parse_error; ++ setclear = 0; ++ cur = &(cur[5]); ++ break; ++ case 'i': ++ if(!(cur[1] == 'n')) goto parse_error; ++ direction = 0; ++ cur = &(cur[2]); ++ break; ++ case 'o': ++ if(!(cur[1] == 'u' && cur[2] == 't')) goto parse_error; ++ direction = 1; ++ cur = &(cur[3]); ++ break; ++ default: goto parse_error; ++ } ++ } ++ // Ok, now set gpio mode and value ++ if(direction) ++ GPDR(summary->gpio) |= GPIO_bit(summary->gpio); ++ else ++ GPDR(summary->gpio) &= ~GPIO_bit(summary->gpio); ++ ++ gafr = GAFR(summary->gpio) & ~(0x3 << (((summary->gpio) & 0xf)*2)); ++ GAFR(summary->gpio) = gafr | (altfn << (((summary->gpio) & 0xf)*2)); ++ ++ if(direction && !altfn) ++ { ++ if(setclear) GPSR(summary->gpio) = GPIO_bit(summary->gpio); ++ else GPCR(summary->gpio) = GPIO_bit(summary->gpio); ++ } ++ ++#ifdef CONFIG_PROC_GPIO_DEBUG ++ printk(KERN_INFO "Set (%s,%s,%s) via /proc/gpio/%s\n",altfn ? (altfn == 1 ? "AF1" : (altfn == 2 ? "AF2" : "AF3")) : "GPIO", ++ direction ? "out" : "in", ++ setclear ? "set" : "clear", ++ summary->name); ++#endif ++ ++ return count; ++ ++parse_error: ++ printk(KERN_CRIT "Parse error: Expect \"[GPIO|AF1|AF2|AF3]|[set|clear]|[in|out] ...\"\n"); ++ return -EINVAL; ++} ++ ++static int proc_gpio_read(char *page, char **start, off_t off, ++ int count, int *eof, void *data) ++{ ++ char *p = page; ++ gpio_summary_type *summary = data; ++ int len, i, af; ++ i = summary->gpio; ++ ++ p += sprintf(p, "%d\t%s\t%s\t%s\n", i, ++ (af = ((GAFR(i) >> ((i & 0x0f) << 0x01)) & 0x03)) ? (af == 1 ? "AF1" : (af == 2 ? "AF2" : "AF3")) : "GPIO", ++ (GPDR(i) & GPIO_bit(i)) ? "out" : "in", ++ (GPLR(i) & GPIO_bit(i)) ? "set" : "clear"); ++ ++ len = (p - page) - off; ++ ++ if(len < 0) ++ { ++ len = 0; ++ } ++ ++ *eof = (len <= count) ? 1 : 0; ++ *start = page + off; ++ ++ return len; ++} ++ ++ ++#ifdef CONFIG_PXA25x ++static const char const *GAFR_DESC[] = { "GAFR0_L", "GAFR0_U", "GAFR1_L", "GAFR1_U", "GAFR2_L", "GAFR2_U" }; ++#elif defined(CONFIG_PXA27x) ++static const char const *GAFR_DESC[] = { "GAFR0_L", "GAFR0_U", "GAFR1_L", "GAFR1_U", "GAFR2_L", "GAFR2_U", "GAFR3_L", "GAFR3_U" }; ++#endif ++ ++static int proc_gafr_read(char *page, char **start, off_t off, ++ int count, int *eof, void *data) ++{ ++ char *p = page; ++ int i, len; ++ ++ for(i=0; i<ARRAY_SIZE(GAFR_DESC); i++) ++ { ++ p += sprintf(p, "%s: %08x\n", GAFR_DESC[i], GAFR(i*16)); ++ } ++ ++ len = (p - page) - off; ++ ++ if(len < 0) ++ { ++ len = 0; ++ } ++ ++ *eof = (len <= count) ? 1 : 0; ++ *start = page + off; ++ ++ return len; ++} ++ ++static int proc_gpdr_read(char *page, char **start, off_t off, ++ int count, int *eof, void *data) ++{ ++ char *p = page; ++ int i, len; ++ ++ for(i=0; i<=2; i++) ++ { ++ p += sprintf(p, "GPDR%d: %08x\n", i, GPDR(i * 32)); ++ } ++ ++ len = (p - page) - off; ++ ++ if(len < 0) ++ { ++ len = 0; ++ } ++ ++ *eof = (len <= count) ? 1 : 0; ++ *start = page + off; ++ ++ return len; ++} ++ ++static int proc_gplr_read(char *page, char **start, off_t off, ++ int count, int *eof, void *data) ++{ ++ char *p = page; ++ int i, len; ++ ++ for(i=0; i<=2; i++) ++ { ++ p += sprintf(p, "GPLR%d: %08x\n", i, GPLR(i * 32)); ++ } ++ ++ len = (p - page) - off; ++ ++ if(len < 0) ++ { ++ len = 0; ++ } ++ ++ *eof = (len <= count) ? 1 : 0; ++ *start = page + off; ++ ++ return len; ++} ++ ++static int __init gpio_init(void) ++{ ++ int i; ++ ++ proc_gpio_parent = NULL; ++ for (proc_gpio_parent = proc_root.subdir; proc_gpio_parent; proc_gpio_parent = proc_gpio_parent->next) { ++ if (( proc_gpio_parent->namelen == 4 ) && ( memcmp(proc_gpio_parent->name, "gpio", 4 ) == 0 )) ++ break; ++ } ++ ++ // proc_gpio_parent will be non-NULL if the directory already exists ++ ++ if (!proc_gpio_parent) { ++ proc_gpio_parent = proc_gpio_parent = create_proc_entry("gpio", S_IFDIR | S_IRUGO | S_IXUGO, NULL); ++ } ++ ++ if(!proc_gpio_parent) return 0; ++ ++ for(i=0; i < (PXA_LAST_GPIO+1); i++) ++ { ++ gpio_summaries[i].gpio = i; ++ sprintf(gpio_summaries[i].name, "GPIO%d", i); ++ proc_gpios[i] = create_proc_entry(gpio_summaries[i].name, 0644, proc_gpio_parent); ++ if(proc_gpios[i]) ++ { ++ proc_gpios[i]->data = &gpio_summaries[i]; ++ proc_gpios[i]->read_proc = proc_gpio_read; ++ proc_gpios[i]->write_proc = proc_gpio_write; ++ } ++ } ++ ++ create_proc_read_entry("GAFR", 0444, proc_gpio_parent, proc_gafr_read, NULL); ++ create_proc_read_entry("GPDR", 0444, proc_gpio_parent, proc_gpdr_read, NULL); ++ create_proc_read_entry("GPLR", 0444, proc_gpio_parent, proc_gplr_read, NULL); ++ ++ return 0; ++} ++ ++static void gpio_exit(void) ++{ ++ int i; ++ ++ remove_proc_entry("GAFR", proc_gpio_parent); ++ remove_proc_entry("GPDR", proc_gpio_parent); ++ remove_proc_entry("GPLR", proc_gpio_parent); ++ ++ for(i=0; i < (PXA_LAST_GPIO+1); i++) ++ { ++ if(proc_gpios[i]) remove_proc_entry(gpio_summaries[i].name, proc_gpio_parent); ++ } ++ ++ if (proc_gpio_parent) ++ { ++ if (!proc_gpio_parent->subdir) ++ { ++ // Only remove /proc/gpio if it's empty. ++ remove_proc_entry( "gpio", NULL ); ++ } ++ } ++ ++} ++ ++module_init(gpio_init); ++module_exit(gpio_exit); ++MODULE_LICENSE("GPL"); |