1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *    Chassis LCD/LED driver for HP-PARISC workstations
7  *      (c) Copyright 2001-2009 Helge Deller <deller@gmx.de>
11  *	- speed-up calculations with inlined assembler
12  *	- interface to write to second row of LCD from /proc (if technically possible)
15  *      - Audit copy_from_user in led_proc_write.
17  *	- Switch from using a tasklet to a work queue, so the led_LCD_driver
50 /* The control of the LEDs and LCDs on PARISC-machines have to be done 
56 static int led_type __read_mostly = -1;
84    lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */
87 	unsigned long lcd_width:16;	/* width of the LCD in chars (DISPLAY_MODEL_LCD only) */
88 	unsigned long lcd_cmd_reg_addr;	/* ptr to LCD cmd-register & data ptr for LED */
89 	unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */
90 	unsigned int min_cmd_delay;	/* delay in uS after cmd-write (LCD only) */
103 #define KITTYHAWK_LCD_CMD  F_EXTEND(0xf0190000UL) /* 64bit-ready */
106 /* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's 
129 /* The workqueue must be created at init-time */
132 	/* Display the default text now */  in start_task()
141 		return -ENOMEM;  in start_task()
150 /* ptr to LCD/LED-specific function */
156 	switch ((long)m->private)  in led_proc_show()
186 		return -EACCES;  in led_proc_write()
189 		count = sizeof(lbuf)-1;  in led_proc_write()
192 		return -EFAULT;  in led_proc_write()
200 		d = *cur++ - '0';  in led_proc_write()
206 		d = *cur++ - '0';  in led_proc_write()
212 		d = *cur++ - '0';  in led_proc_write()
218 		if (*cur && cur[strlen(cur)-1] == '\n')  in led_proc_write()
219 			cur[strlen(cur)-1] = 0;  in led_proc_write()
233 	return -EINVAL;  in led_proc_write()
249 	if (led_type == -1) return -1;  in led_create_procfs()
252 	if (!proc_pdc_root) return -1;  in led_create_procfs()
258 		if (!ent) return -1;  in led_create_procfs()
265 		if (!ent) return -1;  in led_create_procfs()
331 			gsc_writeb( blockp[i]->command, LCD_CMD_REG );  in led_LCD_driver()
334 			gsc_writeb( leds & mask[i] ? blockp[i]->on :   in led_LCD_driver()
335 					blockp[i]->off, LCD_DATA_REG );  in led_LCD_driver()
346    ** calculate if there was TX- or RX-throughput on the network interfaces
368 	    if (!in_dev || !in_dev->ifa_list)  in led_get_net_activity()
370 	    if (ipv4_is_loopback(in_dev->ifa_list->ifa_local))  in led_get_net_activity()
373 	    rx_total += stats->rx_packets;  in led_get_net_activity()
374 	    tx_total += stats->tx_packets;  in led_get_net_activity()
399    ** calculate if there was disk-io in the system
428     - display load average (older machines like 715/64 have 4 "free" LED's for that)
429     - optimizations
449 	count_HZ += jiffies - last_jiffies;  in led_work_func()
456 		/* flash heartbeat-LED like a real heart  in led_work_func()
545    ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported.
562 		printk(KERN_INFO "LCD display at %lx,%lx registered\n",   in register_led_driver()
574 		printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG);  in register_led_driver()
581 		printk(KERN_INFO "LED (ASP-style) display at %lx registered\n",   in register_led_driver()
609    ** At bootup - where the initialisation of the LCD/LED normally happens - 
611    ** so that we delay the led-registration until after busdevices_init() 
635    ** Displays the given string on the LCD-Display of newer machines.
636    ** lcd_print() disables/enables the timer-based led work queue to
651 	/* copy display string to buffer for procfs */  in lcd_print()
667 	/* re-queue the work */  in lcd_print()
678    ** led_init() is called very early in the bootup-process from setup.c 
693 		"Linux %s", init_utsname()->release);  in led_init()
695 	/* Work around the buggy PDC of KittyHawk-machines */  in led_init()
697 	case 0x580:		/* KittyHawk DC2-100 (K100) */  in led_init()
698 	case 0x581:		/* KittyHawk DC3-120 (K210) */  in led_init()
702 		printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, "  in led_init()
733 		case DISPLAY_MODEL_LCD:		/* LCD display */  in led_init()
735 				offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1)  in led_init()
747 		case DISPLAY_MODEL_LASI:	/* Lasi style 8 bit LED display */  in led_init()