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/*
* Chassis LCD/LED driver for HP-PARISC workstations
*
* (c) Copyright 2000 Red Hat Software
* (c) Copyright 2000 Helge Deller <hdeller@redhat.com>
* (c) Copyright 2001-2005 Helge Deller <deller@gmx.de>
* (c) Copyright 2001 Randolph Chung <tausq@debian.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* TODO:
* - speed-up calculations with inlined assembler
* - interface to write to second row of LCD from /proc (if technically possible)
*
* Changes:
* - Audit copy_from_user in led_proc_write.
* Daniele Bellucci <bellucda@tiscali.it>
* - Switch from using a tasklet to a work queue, so the led_LCD_driver
* can sleep.
* David Pye <dmp@davidmpye.dyndns.org>
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/stddef.h> /* for offsetof() */
#include <linux/init.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/utsname.h>
#include <linux/capability.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/in.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/reboot.h>
#include <linux/proc_fs.h>
#include <linux/ctype.h>
#include <linux/blkdev.h>
#include <linux/workqueue.h>
#include <linux/rcupdate.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/hardware.h>
#include <asm/param.h> /* HZ */
#include <asm/led.h>
#include <asm/pdc.h>
#include <asm/uaccess.h>
/* The control of the LEDs and LCDs on PARISC-machines have to be done
completely in software. The necessary calculations are done in a work queue
task which is scheduled regularly, and since the calculations may consume a
relatively large amount of CPU time, some of the calculations can be
turned off with the following variables (controlled via procfs) */
static int led_type __read_mostly = -1;
static unsigned char lastleds; /* LED state from most recent update */
static unsigned int led_heartbeat __read_mostly = 1;
static unsigned int led_diskio __read_mostly = 1;
static unsigned int led_lanrxtx __read_mostly = 1;
static char lcd_text[32] __read_mostly;
static char lcd_text_default[32] __read_mostly;
static struct workqueue_struct *led_wq;
static void led_work_func(void *);
static DECLARE_WORK(led_task, led_work_func, NULL);
#if 0
#define DPRINTK(x) printk x
#else
#define DPRINTK(x)
#endif
struct lcd_block {
unsigned char command; /* stores the command byte */
unsigned char on; /* value for turning LED on */
unsigned char off; /* value for turning LED off */
};
/* Structure returned by PDC_RETURN_CHASSIS_INFO */
/* NOTE: we use unsigned long:16 two times, since the following member
lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */
struct pdc_chassis_lcd_info_ret_block {
unsigned long model:16; /* DISPLAY_MODEL_XXXX */
unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */
unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */
unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */
unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */
unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */
unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */
unsigned char act_enable; /* 0 = no activity (LCD only) */
struct lcd_block heartbeat;
struct lcd_block disk_io;
struct lcd_block lan_rcv;
struct lcd_block lan_tx;
char _pad;
};
/* LCD_CMD and LCD_DATA for KittyHawk machines */
#define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */
#define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1)
/* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's
* HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */
static struct pdc_chassis_lcd_info_ret_block
lcd_info __attribute__((aligned(8))) __read_mostly =
{
.model = DISPLAY_MODEL_LCD,
.lcd_width = 16,
.lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD,
.lcd_data_reg_addr = KITTYHAWK_LCD_DATA,
.min_cmd_delay = 40,
.reset_cmd1 = 0x80,
.reset_cmd2 = 0xc0,
};
/* direct access to some of the lcd_info variables */
#define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr
#define LCD_DATA_REG lcd_info.lcd_data_reg_addr
#define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */
#define LED_HASLCD 1
#define LED_NOLCD 0
/* The workqueue must be created at init-time */
static int start_task(void)
{
/* Display the default text now */
if (led_type == LED_HASLCD) lcd_print( lcd_text_default );
/* Create the work queue and queue the LED task */
led_wq = create_singlethread_workqueue("led_wq");
queue_work(led_wq, &led_task);
return 0;
}
device_initcall(start_task);
/* ptr to LCD/LED-specific function */
static void (*led_func_ptr) (unsigned char) __read_mostly;
#ifdef CONFIG_PROC_FS
static int led_proc_read(char *page, char **start, off_t off, int count,
int *eof, void *data)
{
char *out = page;
int len;
switch ((long)data)
{
case LED_NOLCD:
out += sprintf(out, "Heartbeat: %d\n", led_heartbeat);
out += sprintf(out, "Disk IO: %d\n", led_diskio);
out += sprintf(out, "LAN Rx/Tx: %d\n", led_lanrxtx);
break;
case LED_HASLCD:
out += sprintf(out, "%s\n", lcd_text);
break;
default:
*eof = 1;
return 0;
}
len = out - page - off;
if (len < count) {
*eof = 1;
if (len <= 0) return 0;
} else {
len = count;
}
*start = page + off;
return len;
}
static int led_proc_write(struct file *file, const char *buf,
unsigned long count, void *data)
{
char *cur, lbuf[count + 1];
int d;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
memset(lbuf, 0, count + 1);
if (copy_from_user(lbuf, buf, count))
return -EFAULT;
cur = lbuf;
/* skip initial spaces */
while (*cur && isspace(*cur))
{
cur++;
}
switch ((long)data)
{
case LED_NOLCD:
d = *cur++ - '0';
if (d != 0 && d != 1) goto parse_error;
led_heartbeat = d;
if (*cur++ != ' ') goto parse_error;
d = *cur++ - '0';
if (d != 0 &a
|