1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *	Chassis LCD/LED driver for HP-PARISC workstations
8  *	(c) Copyright 2000-2023 Helge Deller <deller@gmx.de>
32 #include <asm/led.h>
39 static unsigned char lastleds;		/* LED state from most recent update */
43 static unsigned char lcd_no_led_support; /* KittyHawk doesn't support LED on its LCD */
47 	unsigned char on;	/* value for turning LED on     */
48 	unsigned char off;	/* value for turning LED off    */
53    lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */
57 	unsigned long lcd_cmd_reg_addr;	/* ptr to LCD cmd-register & data ptr for LED */
58 	unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */
59 	unsigned int min_cmd_delay;	/* delay in uS after cmd-write (LCD only) */
63 	struct lcd_block heartbeat;  member
75 /* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's
94 /* ptr to LCD/LED-specific function */
126  *	Displays the given string on the LCD-Display of newer machines.
144  *	led_ASP_driver() - LED driver for the ASP controller chip
146  *	@leds: bitmap representing the LED status
163  *	led_LASI_driver() - LED driver for the LASI controller chip
165  *	@leds: bitmap representing the LED status
174  *	led_LCD_driver() - LED & LCD driver for LCD chips
176  *	@leds: bitmap representing the LED status
185 		&lcd_info.heartbeat,  in led_LCD_driver()
197 		gsc_writeb( blockp[i]->command, LCD_CMD_REG );  in led_LCD_driver()
200 		gsc_writeb( leds & mask[i] ? blockp[i]->on :  in led_LCD_driver()
201 				blockp[i]->off, LCD_DATA_REG );  in led_LCD_driver()
218  *	LED/LCD activities.
266 	unsigned char led_bit = p->led_bit;  in set_led()
284 	p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);  in hppa_led_generic_probe()
286 		return -ENOMEM;  in hppa_led_generic_probe()
289 		struct led_classdev *lp = &p->leds[i].led_cdev;  in hppa_led_generic_probe()
291 		p->leds[i].led_bit = BIT(i);  in hppa_led_generic_probe()
292 		lp->name = types[i].name;  in hppa_led_generic_probe()
293 		lp->brightness = LED_FULL;  in hppa_led_generic_probe()
294 		lp->brightness_set = types[i].handler;  in hppa_led_generic_probe()
295 		lp->default_trigger = types[i].default_trigger;  in hppa_led_generic_probe()
296 		err = led_classdev_register(&pdev->dev, lp);  in hppa_led_generic_probe()
298 			dev_err(&pdev->dev, "Could not register %s LED\n",  in hppa_led_generic_probe()
299 			       lp->name);  in hppa_led_generic_probe()
300 			for (i--; i >= 0; i--)  in hppa_led_generic_probe()
301 				led_classdev_unregister(&p->leds[i].led_cdev);  in hppa_led_generic_probe()
317 		led_classdev_unregister(&p->leds[i].led_cdev);  in platform_led_remove()
322 		.name		= "platform-lan-tx",
327 		.name		= "platform-lan-rx",
332 		.name		= "platform-disk",
334 		.default_trigger = "disk-activity",
337 		.name		= "platform-heartbeat",
339 		.default_trigger = "heartbeat",
342 		.name		= "platform-LED4",
347 		.name		= "platform-LED5",
352 		.name		= "platform-LED6",
357 		.name		= "platform-LED7",
368 MODULE_ALIAS("platform:platform-leds");
374 		.name	= "platform-leds",
383 	.name = "platform-leds",
390  *	@cmd_reg: physical address of cmd register for the LED/LCD
391  *	@data_reg: physical address of data register for the LED/LCD
393  *	Registers a chassis LED or LCD which should be driven by this driver.
394  *	Only PDC-based, LASI- or ASP-style LEDs and LCDs are supported.
411 		pr_info("led: LCD display at %#lx and %#lx\n",  in register_led_driver()
423 		pr_info("led: LED display at %#lx\n", LED_DATA_REG);  in register_led_driver()
430 		pr_info("led: LED (ASP-style) display at %#lx\n",  in register_led_driver()
436 		pr_err("led: Unknown LCD/LED model type %d\n", lcd_info.model);  in register_led_driver()
448  *	early_led_init() is called early in the bootup-process and asks the
449  *	PDC for an usable chassis LCD or LED. If the PDC doesn't return any
450  *	info, then a LED might be detected by the LASI or ASP drivers later.
460 		"Linux %s", init_utsname()->release);  in early_led_init()
464 	/* Work around the buggy PDC of KittyHawk-machines */  in early_led_init()
466 	case 0x580:		/* KittyHawk DC2-100 (K100) */  in early_led_init()
467 	case 0x581:		/* KittyHawk DC3-120 (K210) */  in early_led_init()
471 		pr_info("LCD on KittyHawk-Machine found.\n");  in early_led_init()
473 		/* KittyHawk has no LED support on its LCD, so skip LED detection */  in early_led_init()
495 			offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1)  in early_led_init()
503 	case DISPLAY_MODEL_NONE:	/* no LED or LCD available */  in early_led_init()
506 	case DISPLAY_MODEL_LASI:	/* Lasi style 8 bit LED display */  in early_led_init()
512 		pr_warn("PDC reported unknown LCD/LED model %d\n",  in early_led_init()
518 	/* register the LCD/LED driver */  in early_led_init()
526  *	Register_led_regions() registers the LCD/LED regions for /procfs.
527  *	At bootup - where the initialisation of the LCD/LED often happens
529  *	so that we delay the led-registration until after busdevices_init()
549                 printk(KERN_INFO "LED: failed to register LEDs\n");  in startup_leds()