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777 lines
20 KiB
777 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Chassis LCD/LED driver for HP-PARISC workstations |
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* |
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* (c) Copyright 2000 Red Hat Software |
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* (c) Copyright 2000 Helge Deller <[email protected]> |
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* (c) Copyright 2001-2009 Helge Deller <[email protected]> |
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* (c) Copyright 2001 Randolph Chung <[email protected]> |
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* |
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* TODO: |
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* - speed-up calculations with inlined assembler |
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* - interface to write to second row of LCD from /proc (if technically possible) |
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* |
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* Changes: |
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* - Audit copy_from_user in led_proc_write. |
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* Daniele Bellucci <[email protected]> |
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* - Switch from using a tasklet to a work queue, so the led_LCD_driver |
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* can sleep. |
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* David Pye <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/stddef.h> /* for offsetof() */ |
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#include <linux/init.h> |
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#include <linux/types.h> |
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#include <linux/ioport.h> |
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#include <linux/utsname.h> |
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#include <linux/capability.h> |
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#include <linux/delay.h> |
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#include <linux/netdevice.h> |
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#include <linux/inetdevice.h> |
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#include <linux/in.h> |
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#include <linux/interrupt.h> |
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#include <linux/kernel_stat.h> |
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#include <linux/reboot.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> |
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#include <linux/ctype.h> |
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#include <linux/blkdev.h> |
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#include <linux/workqueue.h> |
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#include <linux/rcupdate.h> |
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#include <asm/io.h> |
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#include <asm/processor.h> |
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#include <asm/hardware.h> |
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#include <asm/param.h> /* HZ */ |
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#include <asm/led.h> |
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#include <asm/pdc.h> |
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#include <linux/uaccess.h> |
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/* The control of the LEDs and LCDs on PARISC-machines have to be done |
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completely in software. The necessary calculations are done in a work queue |
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task which is scheduled regularly, and since the calculations may consume a |
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relatively large amount of CPU time, some of the calculations can be |
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turned off with the following variables (controlled via procfs) */ |
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static int led_type __read_mostly = -1; |
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static unsigned char lastleds; /* LED state from most recent update */ |
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static unsigned int led_heartbeat __read_mostly = 1; |
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static unsigned int led_diskio __read_mostly = 1; |
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static unsigned int led_lanrxtx __read_mostly = 1; |
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static char lcd_text[32] __read_mostly; |
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static char lcd_text_default[32] __read_mostly; |
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static int lcd_no_led_support __read_mostly = 0; /* KittyHawk doesn't support LED on its LCD */ |
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static struct workqueue_struct *led_wq; |
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static void led_work_func(struct work_struct *); |
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static DECLARE_DELAYED_WORK(led_task, led_work_func); |
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|
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#if 0 |
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#define DPRINTK(x) printk x |
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#else |
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#define DPRINTK(x) |
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#endif |
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struct lcd_block { |
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unsigned char command; /* stores the command byte */ |
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unsigned char on; /* value for turning LED on */ |
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unsigned char off; /* value for turning LED off */ |
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}; |
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/* Structure returned by PDC_RETURN_CHASSIS_INFO */ |
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/* NOTE: we use unsigned long:16 two times, since the following member |
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lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */ |
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struct pdc_chassis_lcd_info_ret_block { |
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unsigned long model:16; /* DISPLAY_MODEL_XXXX */ |
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unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */ |
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unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */ |
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unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */ |
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unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */ |
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unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */ |
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unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */ |
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unsigned char act_enable; /* 0 = no activity (LCD only) */ |
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struct lcd_block heartbeat; |
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struct lcd_block disk_io; |
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struct lcd_block lan_rcv; |
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struct lcd_block lan_tx; |
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char _pad; |
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}; |
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/* LCD_CMD and LCD_DATA for KittyHawk machines */ |
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#define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */ |
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#define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1) |
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/* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's |
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* HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */ |
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static struct pdc_chassis_lcd_info_ret_block |
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lcd_info __attribute__((aligned(8))) __read_mostly = |
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{ |
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.model = DISPLAY_MODEL_LCD, |
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.lcd_width = 16, |
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.lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD, |
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.lcd_data_reg_addr = KITTYHAWK_LCD_DATA, |
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.min_cmd_delay = 80, |
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.reset_cmd1 = 0x80, |
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.reset_cmd2 = 0xc0, |
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}; |
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/* direct access to some of the lcd_info variables */ |
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#define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr |
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#define LCD_DATA_REG lcd_info.lcd_data_reg_addr |
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#define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */ |
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#define LED_HASLCD 1 |
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#define LED_NOLCD 0 |
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/* The workqueue must be created at init-time */ |
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static int start_task(void) |
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{ |
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/* Display the default text now */ |
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if (led_type == LED_HASLCD) lcd_print( lcd_text_default ); |
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/* KittyHawk has no LED support on its LCD */ |
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if (lcd_no_led_support) return 0; |
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/* Create the work queue and queue the LED task */ |
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led_wq = create_singlethread_workqueue("led_wq"); |
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queue_delayed_work(led_wq, &led_task, 0); |
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return 0; |
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} |
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device_initcall(start_task); |
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/* ptr to LCD/LED-specific function */ |
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static void (*led_func_ptr) (unsigned char) __read_mostly; |
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#ifdef CONFIG_PROC_FS |
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static int led_proc_show(struct seq_file *m, void *v) |
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{ |
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switch ((long)m->private) |
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{ |
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case LED_NOLCD: |
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seq_printf(m, "Heartbeat: %d\n", led_heartbeat); |
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seq_printf(m, "Disk IO: %d\n", led_diskio); |
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seq_printf(m, "LAN Rx/Tx: %d\n", led_lanrxtx); |
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break; |
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case LED_HASLCD: |
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seq_printf(m, "%s\n", lcd_text); |
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break; |
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default: |
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return 0; |
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} |
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return 0; |
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} |
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static int led_proc_open(struct inode *inode, struct file *file) |
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{ |
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return single_open(file, led_proc_show, PDE_DATA(inode)); |
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} |
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static ssize_t led_proc_write(struct file *file, const char __user *buf, |
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size_t count, loff_t *pos) |
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{ |
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void *data = PDE_DATA(file_inode(file)); |
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char *cur, lbuf[32]; |
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int d; |
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if (!capable(CAP_SYS_ADMIN)) |
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return -EACCES; |
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if (count >= sizeof(lbuf)) |
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count = sizeof(lbuf)-1; |
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if (copy_from_user(lbuf, buf, count)) |
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return -EFAULT; |
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lbuf[count] = 0; |
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cur = lbuf; |
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switch ((long)data) |
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{ |
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case LED_NOLCD: |
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d = *cur++ - '0'; |
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if (d != 0 && d != 1) goto parse_error; |
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led_heartbeat = d; |
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if (*cur++ != ' ') goto parse_error; |
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d = *cur++ - '0'; |
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if (d != 0 && d != 1) goto parse_error; |
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led_diskio = d; |
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if (*cur++ != ' ') goto parse_error; |
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d = *cur++ - '0'; |
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if (d != 0 && d != 1) goto parse_error; |
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led_lanrxtx = d; |
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break; |
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case LED_HASLCD: |
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if (*cur && cur[strlen(cur)-1] == '\n') |
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cur[strlen(cur)-1] = 0; |
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if (*cur == 0) |
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cur = lcd_text_default; |
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lcd_print(cur); |
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break; |
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default: |
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return 0; |
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} |
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return count; |
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parse_error: |
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if ((long)data == LED_NOLCD) |
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printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n"); |
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return -EINVAL; |
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} |
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static const struct proc_ops led_proc_ops = { |
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.proc_open = led_proc_open, |
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.proc_read = seq_read, |
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.proc_lseek = seq_lseek, |
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.proc_release = single_release, |
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.proc_write = led_proc_write, |
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}; |
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static int __init led_create_procfs(void) |
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{ |
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struct proc_dir_entry *proc_pdc_root = NULL; |
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struct proc_dir_entry *ent; |
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if (led_type == -1) return -1; |
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proc_pdc_root = proc_mkdir("pdc", NULL); |
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if (!proc_pdc_root) return -1; |
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if (!lcd_no_led_support) |
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{ |
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ent = proc_create_data("led", S_IRUGO|S_IWUSR, proc_pdc_root, |
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&led_proc_ops, (void *)LED_NOLCD); /* LED */ |
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if (!ent) return -1; |
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} |
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if (led_type == LED_HASLCD) |
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{ |
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ent = proc_create_data("lcd", S_IRUGO|S_IWUSR, proc_pdc_root, |
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&led_proc_ops, (void *)LED_HASLCD); /* LCD */ |
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if (!ent) return -1; |
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} |
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return 0; |
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} |
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#endif |
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/* |
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** |
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** led_ASP_driver() |
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** |
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*/ |
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#define LED_DATA 0x01 /* data to shift (0:on 1:off) */ |
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#define LED_STROBE 0x02 /* strobe to clock data */ |
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static void led_ASP_driver(unsigned char leds) |
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{ |
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int i; |
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leds = ~leds; |
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for (i = 0; i < 8; i++) { |
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unsigned char value; |
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value = (leds & 0x80) >> 7; |
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gsc_writeb( value, LED_DATA_REG ); |
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gsc_writeb( value | LED_STROBE, LED_DATA_REG ); |
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leds <<= 1; |
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} |
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} |
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/* |
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** |
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** led_LASI_driver() |
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** |
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*/ |
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static void led_LASI_driver(unsigned char leds) |
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{ |
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leds = ~leds; |
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gsc_writeb( leds, LED_DATA_REG ); |
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} |
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/* |
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** |
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** led_LCD_driver() |
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** |
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*/ |
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static void led_LCD_driver(unsigned char leds) |
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{ |
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static int i; |
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static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO, |
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LED_LAN_RCV, LED_LAN_TX }; |
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static struct lcd_block * blockp[4] = { |
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&lcd_info.heartbeat, |
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&lcd_info.disk_io, |
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&lcd_info.lan_rcv, |
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&lcd_info.lan_tx |
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}; |
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/* Convert min_cmd_delay to milliseconds */ |
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unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000); |
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for (i=0; i<4; ++i) |
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{ |
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if ((leds & mask[i]) != (lastleds & mask[i])) |
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{ |
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gsc_writeb( blockp[i]->command, LCD_CMD_REG ); |
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msleep(msec_cmd_delay); |
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gsc_writeb( leds & mask[i] ? blockp[i]->on : |
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blockp[i]->off, LCD_DATA_REG ); |
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msleep(msec_cmd_delay); |
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} |
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} |
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} |
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/* |
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** |
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** led_get_net_activity() |
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** |
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** calculate if there was TX- or RX-throughput on the network interfaces |
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** (analog to dev_get_info() from net/core/dev.c) |
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** |
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*/ |
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static __inline__ int led_get_net_activity(void) |
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{ |
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#ifndef CONFIG_NET |
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return 0; |
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#else |
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static u64 rx_total_last, tx_total_last; |
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u64 rx_total, tx_total; |
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struct net_device *dev; |
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int retval; |
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rx_total = tx_total = 0; |
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/* we are running as a workqueue task, so we can use an RCU lookup */ |
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rcu_read_lock(); |
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for_each_netdev_rcu(&init_net, dev) { |
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const struct rtnl_link_stats64 *stats; |
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struct rtnl_link_stats64 temp; |
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struct in_device *in_dev = __in_dev_get_rcu(dev); |
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if (!in_dev || !in_dev->ifa_list) |
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continue; |
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if (ipv4_is_loopback(in_dev->ifa_list->ifa_local)) |
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continue; |
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stats = dev_get_stats(dev, &temp); |
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rx_total += stats->rx_packets; |
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tx_total += stats->tx_packets; |
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} |
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rcu_read_unlock(); |
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retval = 0; |
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if (rx_total != rx_total_last) { |
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rx_total_last = rx_total; |
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retval |= LED_LAN_RCV; |
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} |
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if (tx_total != tx_total_last) { |
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tx_total_last = tx_total; |
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retval |= LED_LAN_TX; |
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} |
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return retval; |
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#endif |
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} |
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/* |
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** |
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** led_get_diskio_activity() |
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** |
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** calculate if there was disk-io in the system |
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** |
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*/ |
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static __inline__ int led_get_diskio_activity(void) |
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{ |
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static unsigned long last_pgpgin, last_pgpgout; |
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unsigned long events[NR_VM_EVENT_ITEMS]; |
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int changed; |
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all_vm_events(events); |
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/* Just use a very simple calculation here. Do not care about overflow, |
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since we only want to know if there was activity or not. */ |
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changed = (events[PGPGIN] != last_pgpgin) || |
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(events[PGPGOUT] != last_pgpgout); |
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last_pgpgin = events[PGPGIN]; |
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last_pgpgout = events[PGPGOUT]; |
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return (changed ? LED_DISK_IO : 0); |
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} |
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/* |
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** led_work_func() |
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** |
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** manages when and which chassis LCD/LED gets updated |
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TODO: |
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- display load average (older machines like 715/64 have 4 "free" LED's for that) |
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- optimizations |
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*/ |
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#define HEARTBEAT_LEN (HZ*10/100) |
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#define HEARTBEAT_2ND_RANGE_START (HZ*28/100) |
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#define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) |
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#define LED_UPDATE_INTERVAL (1 + (HZ*19/1000)) |
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static void led_work_func (struct work_struct *unused) |
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{ |
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static unsigned long last_jiffies; |
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static unsigned long count_HZ; /* counter in range 0..HZ */ |
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unsigned char currentleds = 0; /* stores current value of the LEDs */ |
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/* exit if not initialized */ |
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if (!led_func_ptr) |
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return; |
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/* increment the heartbeat timekeeper */ |
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count_HZ += jiffies - last_jiffies; |
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last_jiffies = jiffies; |
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if (count_HZ >= HZ) |
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count_HZ = 0; |
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if (likely(led_heartbeat)) |
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{ |
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/* flash heartbeat-LED like a real heart |
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* (2 x short then a long delay) |
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*/ |
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if (count_HZ < HEARTBEAT_LEN || |
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(count_HZ >= HEARTBEAT_2ND_RANGE_START && |
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count_HZ < HEARTBEAT_2ND_RANGE_END)) |
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currentleds |= LED_HEARTBEAT; |
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} |
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if (likely(led_lanrxtx)) currentleds |= led_get_net_activity(); |
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if (likely(led_diskio)) currentleds |= led_get_diskio_activity(); |
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/* blink LEDs if we got an Oops (HPMC) */ |
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if (unlikely(oops_in_progress)) { |
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if (boot_cpu_data.cpu_type >= pcxl2) { |
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/* newer machines don't have loadavg. LEDs, so we |
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* let all LEDs blink twice per second instead */ |
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currentleds = (count_HZ <= (HZ/2)) ? 0 : 0xff; |
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} else { |
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/* old machines: blink loadavg. LEDs twice per second */ |
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if (count_HZ <= (HZ/2)) |
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currentleds &= ~(LED4|LED5|LED6|LED7); |
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else |
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currentleds |= (LED4|LED5|LED6|LED7); |
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} |
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} |
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if (currentleds != lastleds) |
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{ |
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led_func_ptr(currentleds); /* Update the LCD/LEDs */ |
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lastleds = currentleds; |
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} |
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queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL); |
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} |
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/* |
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** led_halt() |
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** |
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** called by the reboot notifier chain at shutdown and stops all |
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** LED/LCD activities. |
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** |
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*/ |
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static int led_halt(struct notifier_block *, unsigned long, void *); |
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static struct notifier_block led_notifier = { |
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.notifier_call = led_halt, |
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}; |
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static int notifier_disabled = 0; |
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static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) |
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{ |
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char *txt; |
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if (notifier_disabled) |
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return NOTIFY_OK; |
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notifier_disabled = 1; |
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switch (event) { |
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case SYS_RESTART: txt = "SYSTEM RESTART"; |
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break; |
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case SYS_HALT: txt = "SYSTEM HALT"; |
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break; |
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case SYS_POWER_OFF: txt = "SYSTEM POWER OFF"; |
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break; |
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default: return NOTIFY_DONE; |
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} |
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/* Cancel the work item and delete the queue */ |
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if (led_wq) { |
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cancel_delayed_work_sync(&led_task); |
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destroy_workqueue(led_wq); |
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led_wq = NULL; |
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} |
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if (lcd_info.model == DISPLAY_MODEL_LCD) |
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lcd_print(txt); |
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else |
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if (led_func_ptr) |
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led_func_ptr(0xff); /* turn all LEDs ON */ |
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return NOTIFY_OK; |
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} |
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/* |
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** register_led_driver() |
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** |
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** registers an external LED or LCD for usage by this driver. |
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** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. |
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** |
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*/ |
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int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) |
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{ |
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static int initialized; |
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if (initialized || !data_reg) |
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return 1; |
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lcd_info.model = model; /* store the values */ |
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LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; |
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switch (lcd_info.model) { |
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case DISPLAY_MODEL_LCD: |
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LCD_DATA_REG = data_reg; |
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printk(KERN_INFO "LCD display at %lx,%lx registered\n", |
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LCD_CMD_REG , LCD_DATA_REG); |
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led_func_ptr = led_LCD_driver; |
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led_type = LED_HASLCD; |
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break; |
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|
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case DISPLAY_MODEL_LASI: |
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/* Skip to register LED in QEMU */ |
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if (running_on_qemu) |
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return 1; |
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LED_DATA_REG = data_reg; |
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led_func_ptr = led_LASI_driver; |
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printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); |
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led_type = LED_NOLCD; |
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break; |
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|
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case DISPLAY_MODEL_OLD_ASP: |
|
LED_DATA_REG = data_reg; |
|
led_func_ptr = led_ASP_driver; |
|
printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", |
|
LED_DATA_REG); |
|
led_type = LED_NOLCD; |
|
break; |
|
|
|
default: |
|
printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", |
|
__func__, lcd_info.model); |
|
return 1; |
|
} |
|
|
|
/* mark the LCD/LED driver now as initialized and |
|
* register to the reboot notifier chain */ |
|
initialized++; |
|
register_reboot_notifier(&led_notifier); |
|
|
|
/* Ensure the work is queued */ |
|
if (led_wq) { |
|
queue_delayed_work(led_wq, &led_task, 0); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
** register_led_regions() |
|
** |
|
** register_led_regions() registers the LCD/LED regions for /procfs. |
|
** At bootup - where the initialisation of the LCD/LED normally happens - |
|
** not all internal structures of request_region() are properly set up, |
|
** so that we delay the led-registration until after busdevices_init() |
|
** has been executed. |
|
** |
|
*/ |
|
|
|
void __init register_led_regions(void) |
|
{ |
|
switch (lcd_info.model) { |
|
case DISPLAY_MODEL_LCD: |
|
request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); |
|
request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); |
|
break; |
|
case DISPLAY_MODEL_LASI: |
|
case DISPLAY_MODEL_OLD_ASP: |
|
request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); |
|
break; |
|
} |
|
} |
|
|
|
|
|
/* |
|
** |
|
** lcd_print() |
|
** |
|
** Displays the given string on the LCD-Display of newer machines. |
|
** lcd_print() disables/enables the timer-based led work queue to |
|
** avoid a race condition while writing the CMD/DATA register pair. |
|
** |
|
*/ |
|
int lcd_print( const char *str ) |
|
{ |
|
int i; |
|
|
|
if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) |
|
return 0; |
|
|
|
/* temporarily disable the led work task */ |
|
if (led_wq) |
|
cancel_delayed_work_sync(&led_task); |
|
|
|
/* copy display string to buffer for procfs */ |
|
strlcpy(lcd_text, str, sizeof(lcd_text)); |
|
|
|
/* Set LCD Cursor to 1st character */ |
|
gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG); |
|
udelay(lcd_info.min_cmd_delay); |
|
|
|
/* Print the string */ |
|
for (i=0; i < lcd_info.lcd_width; i++) { |
|
if (str && *str) |
|
gsc_writeb(*str++, LCD_DATA_REG); |
|
else |
|
gsc_writeb(' ', LCD_DATA_REG); |
|
udelay(lcd_info.min_cmd_delay); |
|
} |
|
|
|
/* re-queue the work */ |
|
if (led_wq) { |
|
queue_delayed_work(led_wq, &led_task, 0); |
|
} |
|
|
|
return lcd_info.lcd_width; |
|
} |
|
|
|
/* |
|
** led_init() |
|
** |
|
** led_init() is called very early in the bootup-process from setup.c |
|
** and asks the PDC for an usable chassis LCD or LED. |
|
** If the PDC doesn't return any info, then the LED |
|
** is detected by lasi.c or asp.c and registered with the |
|
** above functions lasi_led_init() or asp_led_init(). |
|
** KittyHawk machines have often a buggy PDC, so that |
|
** we explicitly check for those machines here. |
|
*/ |
|
|
|
int __init led_init(void) |
|
{ |
|
struct pdc_chassis_info chassis_info; |
|
int ret; |
|
|
|
snprintf(lcd_text_default, sizeof(lcd_text_default), |
|
"Linux %s", init_utsname()->release); |
|
|
|
/* Work around the buggy PDC of KittyHawk-machines */ |
|
switch (CPU_HVERSION) { |
|
case 0x580: /* KittyHawk DC2-100 (K100) */ |
|
case 0x581: /* KittyHawk DC3-120 (K210) */ |
|
case 0x582: /* KittyHawk DC3 100 (K400) */ |
|
case 0x583: /* KittyHawk DC3 120 (K410) */ |
|
case 0x58B: /* KittyHawk DC2 100 (K200) */ |
|
printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " |
|
"LED detection skipped.\n", __FILE__, CPU_HVERSION); |
|
lcd_no_led_support = 1; |
|
goto found; /* use the preinitialized values of lcd_info */ |
|
} |
|
|
|
/* initialize the struct, so that we can check for valid return values */ |
|
lcd_info.model = DISPLAY_MODEL_NONE; |
|
chassis_info.actcnt = chassis_info.maxcnt = 0; |
|
|
|
ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); |
|
if (ret == PDC_OK) { |
|
DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " |
|
"lcd_width=%d, cmd_delay=%u,\n" |
|
"%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", |
|
__FILE__, lcd_info.model, |
|
(lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : |
|
(lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", |
|
lcd_info.lcd_width, lcd_info.min_cmd_delay, |
|
__FILE__, sizeof(lcd_info), |
|
chassis_info.actcnt, chassis_info.maxcnt)); |
|
DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", |
|
__FILE__, lcd_info.lcd_cmd_reg_addr, |
|
lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, |
|
lcd_info.reset_cmd2, lcd_info.act_enable )); |
|
|
|
/* check the results. Some machines have a buggy PDC */ |
|
if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) |
|
goto not_found; |
|
|
|
switch (lcd_info.model) { |
|
case DISPLAY_MODEL_LCD: /* LCD display */ |
|
if (chassis_info.actcnt < |
|
offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) |
|
goto not_found; |
|
if (!lcd_info.act_enable) { |
|
DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); |
|
goto not_found; |
|
} |
|
break; |
|
|
|
case DISPLAY_MODEL_NONE: /* no LED or LCD available */ |
|
printk(KERN_INFO "PDC reported no LCD or LED.\n"); |
|
goto not_found; |
|
|
|
case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ |
|
if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) |
|
goto not_found; |
|
break; |
|
|
|
default: |
|
printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", |
|
lcd_info.model); |
|
goto not_found; |
|
} /* switch() */ |
|
|
|
found: |
|
/* register the LCD/LED driver */ |
|
register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); |
|
return 0; |
|
|
|
} else { /* if() */ |
|
DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); |
|
} |
|
|
|
not_found: |
|
lcd_info.model = DISPLAY_MODEL_NONE; |
|
return 1; |
|
} |
|
|
|
static void __exit led_exit(void) |
|
{ |
|
unregister_reboot_notifier(&led_notifier); |
|
return; |
|
} |
|
|
|
#ifdef CONFIG_PROC_FS |
|
module_init(led_create_procfs) |
|
#endif
|
|
|