diff options
| -rw-r--r-- | drivers/char/nvram.c | 264 |
1 files changed, 123 insertions, 141 deletions
diff --git a/drivers/char/nvram.c b/drivers/char/nvram.c index 8054ee839b3c..88cee4099be9 100644 --- a/drivers/char/nvram.c +++ b/drivers/char/nvram.c @@ -32,9 +32,10 @@ * added changelog * 1.2 Erik Gilling: Cobalt Networks support * Tim Hockin: general cleanup, Cobalt support + * 1.3 Wim Van Sebroeck: convert PRINT_PROC to seq_file */ -#define NVRAM_VERSION "1.2" +#define NVRAM_VERSION "1.3" #include <linux/module.h> #include <linux/smp_lock.h> @@ -46,7 +47,7 @@ /* select machine configuration */ #if defined(CONFIG_ATARI) # define MACH ATARI -#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and others?? */ +#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and ?? */ # define MACH PC #else # error Cannot build nvram driver for this machine configuration. @@ -106,10 +107,11 @@ #include <linux/mc146818rtc.h> #include <linux/init.h> #include <linux/proc_fs.h> +#include <linux/seq_file.h> #include <linux/spinlock.h> +#include <linux/io.h> +#include <linux/uaccess.h> -#include <asm/io.h> -#include <asm/uaccess.h> #include <asm/system.h> static DEFINE_SPINLOCK(nvram_state_lock); @@ -122,8 +124,8 @@ static int mach_check_checksum(void); static void mach_set_checksum(void); #ifdef CONFIG_PROC_FS -static int mach_proc_infos(unsigned char *contents, char *buffer, int *len, - off_t *begin, off_t offset, int size); +static void mach_proc_infos(unsigned char *contents, struct seq_file *seq, + void *offset); #endif /* @@ -133,18 +135,17 @@ static int mach_proc_infos(unsigned char *contents, char *buffer, int *len, * * It is worth noting that these functions all access bytes of general * purpose memory in the NVRAM - that is to say, they all add the - * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not + * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not * know about the RTC cruft. */ -unsigned char -__nvram_read_byte(int i) +unsigned char __nvram_read_byte(int i) { return CMOS_READ(NVRAM_FIRST_BYTE + i); } +EXPORT_SYMBOL(__nvram_read_byte); -unsigned char -nvram_read_byte(int i) +unsigned char nvram_read_byte(int i) { unsigned long flags; unsigned char c; @@ -154,16 +155,16 @@ nvram_read_byte(int i) spin_unlock_irqrestore(&rtc_lock, flags); return c; } +EXPORT_SYMBOL(nvram_read_byte); /* This races nicely with trying to read with checksum checking (nvram_read) */ -void -__nvram_write_byte(unsigned char c, int i) +void __nvram_write_byte(unsigned char c, int i) { CMOS_WRITE(c, NVRAM_FIRST_BYTE + i); } +EXPORT_SYMBOL(__nvram_write_byte); -void -nvram_write_byte(unsigned char c, int i) +void nvram_write_byte(unsigned char c, int i) { unsigned long flags; @@ -171,15 +172,15 @@ nvram_write_byte(unsigned char c, int i) __nvram_write_byte(c, i); spin_unlock_irqrestore(&rtc_lock, flags); } +EXPORT_SYMBOL(nvram_write_byte); -int -__nvram_check_checksum(void) +int __nvram_check_checksum(void) { return mach_check_checksum(); } +EXPORT_SYMBOL(__nvram_check_checksum); -int -nvram_check_checksum(void) +int nvram_check_checksum(void) { unsigned long flags; int rv; @@ -189,16 +190,15 @@ nvram_check_checksum(void) spin_unlock_irqrestore(&rtc_lock, flags); return rv; } +EXPORT_SYMBOL(nvram_check_checksum); -static void -__nvram_set_checksum(void) +static void __nvram_set_checksum(void) { mach_set_checksum(); } #if 0 -void -nvram_set_checksum(void) +void nvram_set_checksum(void) { unsigned long flags; @@ -212,7 +212,7 @@ nvram_set_checksum(void) * The are the file operation function for user access to /dev/nvram */ -static loff_t nvram_llseek(struct file *file,loff_t offset, int origin ) +static loff_t nvram_llseek(struct file *file, loff_t offset, int origin) { lock_kernel(); switch (origin) { @@ -230,8 +230,8 @@ static loff_t nvram_llseek(struct file *file,loff_t offset, int origin ) return (offset >= 0) ? (file->f_pos = offset) : -EINVAL; } -static ssize_t -nvram_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) +static ssize_t nvram_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) { unsigned char contents[NVRAM_BYTES]; unsigned i = *ppos; @@ -254,13 +254,13 @@ nvram_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) return tmp - contents; - checksum_err: +checksum_err: spin_unlock_irq(&rtc_lock); return -EIO; } -static ssize_t -nvram_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) +static ssize_t nvram_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) { unsigned char contents[NVRAM_BYTES]; unsigned i = *ppos; @@ -287,14 +287,13 @@ nvram_write(struct file *file, const char __user *buf, size_t count, loff_t *ppo return tmp - contents; - checksum_err: +checksum_err: spin_unlock_irq(&rtc_lock); return -EIO; } -static int -nvram_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) +static int nvram_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) { int i; @@ -315,7 +314,7 @@ nvram_ioctl(struct inode *inode, struct file *file, return 0; case NVRAM_SETCKS: - /* just set checksum, contents unchanged (maybe useful after + /* just set checksum, contents unchanged (maybe useful after * checksum garbaged somehow...) */ if (!capable(CAP_SYS_ADMIN)) return -EACCES; @@ -330,8 +329,7 @@ nvram_ioctl(struct inode *inode, struct file *file, } } -static int -nvram_open(struct inode *inode, struct file *file) +static int nvram_open(struct inode *inode, struct file *file) { lock_kernel(); spin_lock(&nvram_state_lock); @@ -356,8 +354,7 @@ nvram_open(struct inode *inode, struct file *file) return 0; } -static int -nvram_release(struct inode *inode, struct file *file) +static int nvram_release(struct inode *inode, struct file *file) { spin_lock(&nvram_state_lock); @@ -375,48 +372,47 @@ nvram_release(struct inode *inode, struct file *file) } #ifndef CONFIG_PROC_FS -static int -nvram_read_proc(char *buffer, char **start, off_t offset, - int size, int *eof, void *data) +static int nvram_add_proc_fs(void) { return 0; } + #else -static int -nvram_read_proc(char *buffer, char **start, off_t offset, - int size, int *eof, void *data) +static int nvram_proc_read(struct seq_file *seq, void *offset) { unsigned char contents[NVRAM_BYTES]; - int i, len = 0; - off_t begin = 0; + int i = 0; spin_lock_irq(&rtc_lock); for (i = 0; i < NVRAM_BYTES; ++i) contents[i] = __nvram_read_byte(i); spin_unlock_irq(&rtc_lock); - *eof = mach_proc_infos(contents, buffer, &len, &begin, offset, size); + mach_proc_infos(contents, seq, offset); - if (offset >= begin + len) - return 0; - *start = buffer + (offset - begin); - return (size < begin + len - offset) ? size : begin + len - offset; + return 0; +} +static int nvram_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, nvram_proc_read, NULL); } -/* This macro frees the machine specific function from bounds checking and - * this like that... */ -#define PRINT_PROC(fmt,args...) \ - do { \ - *len += sprintf(buffer+*len, fmt, ##args); \ - if (*begin + *len > offset + size) \ - return 0; \ - if (*begin + *len < offset) { \ - *begin += *len; \ - *len = 0; \ - } \ - } while(0) +static const struct file_operations nvram_proc_fops = { + .owner = THIS_MODULE, + .open = nvram_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int nvram_add_proc_fs(void) +{ + if (!proc_create("driver/nvram", 0, NULL, &nvram_proc_fops)) + return -ENOMEM; + return 0; +} #endif /* CONFIG_PROC_FS */ @@ -436,8 +432,7 @@ static struct miscdevice nvram_dev = { &nvram_fops }; -static int __init -nvram_init(void) +static int __init nvram_init(void) { int ret; @@ -451,23 +446,21 @@ nvram_init(void) NVRAM_MINOR); goto out; } - if (!create_proc_read_entry("driver/nvram", 0, NULL, nvram_read_proc, - NULL)) { + ret = nvram_add_proc_fs(); + if (ret) { printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n"); - ret = -ENOMEM; goto outmisc; } ret = 0; printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n"); - out: +out: return ret; - outmisc: +outmisc: misc_deregister(&nvram_dev); goto out; } -static void __exit -nvram_cleanup_module(void) +static void __exit nvram_cleanup_module(void) { remove_proc_entry("driver/nvram", NULL); misc_deregister(&nvram_dev); @@ -482,8 +475,7 @@ module_exit(nvram_cleanup_module); #if MACH == PC -static int -pc_check_checksum(void) +static int pc_check_checksum(void) { int i; unsigned short sum = 0; @@ -493,11 +485,10 @@ pc_check_checksum(void) sum += __nvram_read_byte(i); expect = __nvram_read_byte(PC_CKS_LOC)<<8 | __nvram_read_byte(PC_CKS_LOC+1); - return ((sum & 0xffff) == expect); + return (sum & 0xffff) == expect; } -static void -pc_set_checksum(void) +static void pc_set_checksum(void) { int i; unsigned short sum = 0; @@ -522,9 +513,8 @@ static char *gfx_types[] = { "monochrome", }; -static int -pc_proc_infos(unsigned char *nvram, char *buffer, int *len, - off_t *begin, off_t offset, int size) +static void pc_proc_infos(unsigned char *nvram, struct seq_file *seq, + void *offset) { int checksum; int type; @@ -533,56 +523,57 @@ pc_proc_infos(unsigned char *nvram, char *buffer, int *len, checksum = __nvram_check_checksum(); spin_unlock_irq(&rtc_lock); - PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not "); + seq_printf(seq, "Checksum status: %svalid\n", checksum ? "" : "not "); - PRINT_PROC("# floppies : %d\n", + seq_printf(seq, "# floppies : %d\n", (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0); - PRINT_PROC("Floppy 0 type : "); + seq_printf(seq, "Floppy 0 type : "); type = nvram[2] >> 4; if (type < ARRAY_SIZE(floppy_types)) - PRINT_PROC("%s\n", floppy_types[type]); + seq_printf(seq, "%s\n", floppy_types[type]); else - PRINT_PROC("%d (unknown)\n", type); - PRINT_PROC("Floppy 1 type : "); + seq_printf(seq, "%d (unknown)\n", type); + seq_printf(seq, "Floppy 1 type : "); type = nvram[2] & 0x0f; if (type < ARRAY_SIZE(floppy_types)) - PRINT_PROC("%s\n", floppy_types[type]); + seq_printf(seq, "%s\n", floppy_types[type]); else - PRINT_PROC("%d (unknown)\n", type); + seq_printf(seq, "%d (unknown)\n", type); - PRINT_PROC("HD 0 type : "); + seq_printf(seq, "HD 0 type : "); type = nvram[4] >> 4; if (type) - PRINT_PROC("%02x\n", type == 0x0f ? nvram[11] : type); + seq_printf(seq, "%02x\n", type == 0x0f ? nvram[11] : type); else - PRINT_PROC("none\n"); + seq_printf(seq, "none\n"); - PRINT_PROC("HD 1 type : "); + seq_printf(seq, "HD 1 type : "); type = nvram[4] & 0x0f; if (type) - PRINT_PROC("%02x\n", type == 0x0f ? nvram[12] : type); + seq_printf(seq, "%02x\n", type == 0x0f ? nvram[12] : type); else - PRINT_PROC("none\n"); + seq_printf(seq, "none\n"); - PRINT_PROC("HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", + seq_printf(seq, "HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", nvram[18] | (nvram[19] << 8), nvram[20], nvram[25], nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8)); - PRINT_PROC("HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", + seq_printf(seq, "HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", nvram[39] | (nvram[40] << 8), nvram[41], nvram[46], nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8)); - PRINT_PROC("DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8)); - PRINT_PROC("Extended memory: %d kB (configured), %d kB (tested)\n", + seq_printf(seq, "DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8)); + seq_printf(seq, "Extended memory: %d kB (configured), %d kB (tested)\n", nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8)); - PRINT_PROC("Gfx adapter : %s\n", gfx_types[(nvram[6] >> 4) & 3]); + seq_printf(seq, "Gfx adapter : %s\n", + gfx_types[(nvram[6] >> 4) & 3]); - PRINT_PROC("FPU : %sinstalled\n", + seq_printf(seq, "FPU : %sinstalled\n", (nvram[6] & 2) ? "" : "not "); - return 1; + return; } #endif @@ -590,20 +581,18 @@ pc_proc_infos(unsigned char *nvram, char *buffer, int *len, #if MACH == ATARI -static int -atari_check_checksum(void) +static int atari_check_checksum(void) { int i; unsigned char sum = 0; for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) sum += __nvram_read_byte(i); - return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff) && - __nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff)); + return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff)) && + (__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff)); } -static void -atari_set_checksum(void) +static void atari_set_checksum(void) { int i; unsigned char sum = 0; @@ -654,82 +643,75 @@ static char *colors[] = { "2", "4", "16", "256", "65536", "??", "??", "??" }; -static int -atari_proc_infos(unsigned char *nvram, char *buffer, int *len, - off_t *begin, off_t offset, int size) +static void atari_proc_infos(unsigned char *nvram, struct seq_file *seq, + void *offset) { int checksum = nvram_check_checksum(); int i; unsigned vmode; - PRINT_PROC("Checksum status : %svalid\n", checksum ? "" : "not "); + seq_printf(seq, "Checksum status : %svalid\n", checksum ? "" : "not "); - PRINT_PROC("Boot preference : "); + seq_printf(seq, "Boot preference : "); for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) { if (nvram[1] == boot_prefs[i].val) { - PRINT_PROC("%s\n", boot_prefs[i].name); + seq_printf(seq, "%s\n", boot_prefs[i].name); break; } } if (i < 0) - PRINT_PROC("0x%02x (undefined)\n", nvram[1]); + seq_printf(seq, "0x%02x (undefined)\n", nvram[1]); - PRINT_PROC("SCSI arbitration : %s\n", + seq_printf(seq, "SCSI arbitration : %s\n", (nvram[16] & 0x80) ? "on" : "off"); - PRINT_PROC("SCSI host ID : "); + seq_printf(seq, "SCSI host ID : "); if (nvram[16] & 0x80) - PRINT_PROC("%d\n", nvram[16] & 7); + seq_printf(seq, "%d\n", nvram[16] & 7); else - PRINT_PROC("n/a\n"); + seq_printf(seq, "n/a\n"); /* the following entries are defined only for the Falcon */ if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON) - return 1; + return; - PRINT_PROC("OS language : "); + seq_printf(seq, "OS language : "); if (nvram[6] < ARRAY_SIZE(languages)) - PRINT_PROC("%s\n", languages[nvram[6]]); + seq_printf(seq, "%s\n", languages[nvram[6]]); else - PRINT_PROC("%u (undefined)\n", nvram[6]); - PRINT_PROC("Keyboard language: "); + seq_printf(seq, "%u (undefined)\n", nvram[6]); + seq_printf(seq, "Keyboard language: "); if (nvram[7] < ARRAY_SIZE(languages)) - PRINT_PROC("%s\n", languages[nvram[7]]); + seq_printf(seq, "%s\n", languages[nvram[7]]); else - PRINT_PROC("%u (undefined)\n", nvram[7]); - PRINT_PROC("Date format : "); - PRINT_PROC(dateformat[nvram[8] & 7], + seq_printf(seq, "%u (undefined)\n", nvram[7]); + seq_printf(seq, "Date format : "); + seq_printf(seq, dateformat[nvram[8] & 7], nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/'); - PRINT_PROC(", %dh clock\n", nvram[8] & 16 ? 24 : 12); - PRINT_PROC("Boot delay : "); + seq_printf(seq, ", %dh clock\n", nvram[8] & 16 ? 24 : 12); + seq_printf(seq, "Boot delay : "); if (nvram[10] == 0) - PRINT_PROC("default"); + seq_printf(seq, "default"); else - PRINT_PROC("%ds%s\n", nvram[10], + seq_printf(seq, "%ds%s\n", nvram[10], nvram[10] < 8 ? ", no memory test" : ""); vmode = (nvram[14] << 8) || nvram[15]; - PRINT_PROC("Video mode : %s colors, %d columns, %s %s monitor\n", + seq_printf(seq, + "Video mode : %s colors, %d columns, %s %s monitor\n", colors[vmode & 7], vmode & 8 ? 80 : 40, vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC"); - PRINT_PROC(" %soverscan, compat. mode %s%s\n", + seq_printf(seq, " %soverscan, compat. mode %s%s\n", vmode & 64 ? "" : "no ", vmode & 128 ? "on" : "off", vmode & 256 ? (vmode & 16 ? ", line doubling" : ", half screen") : ""); - return 1; + return; } #endif #endif /* MACH == ATARI */ MODULE_LICENSE("GPL"); - -EXPORT_SYMBOL(__nvram_read_byte); -EXPORT_SYMBOL(nvram_read_byte); -EXPORT_SYMBOL(__nvram_write_byte); -EXPORT_SYMBOL(nvram_write_byte); -EXPORT_SYMBOL(__nvram_check_checksum); -EXPORT_SYMBOL(nvram_check_checksum); MODULE_ALIAS_MISCDEV(NVRAM_MINOR); |