1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Technologic Systems TS-5500 Single Board Computer support
5  * Copyright (C) 2013-2014 Savoir-faire Linux Inc.
8  * This driver registers the Technologic Systems TS-5500 Single Board Computer
11  * Documentation/ABI/testing/sysfs-platform-ts5500.
13  * This code may be extended to support similar x86-based platforms.
14  * Actually, the TS-5500 and TS-5400 are supported.
17 #include <linux/delay.h>
28 #define TS5500_PRODUCT_CODE		0x60	/* TS-5500 product code */
29 #define TS5400_PRODUCT_CODE		0x40	/* TS-5400 product code */
31 /* SRAM/RS-485/ADC options, and RS-485 RTS/Automatic RS-485 flags register */
34 #define TS5500_RS485			BIT(1)	/* RS-485 option */
36 #define TS5500_RS485_RTS		BIT(6)	/* RTS for RS-485 */
37 #define TS5500_RS485_AUTO		BIT(7)	/* Automatic RS-485 */
63  * struct ts5500_sbc - TS-5500 board description
67  * @rs485:	Flag for RS-485 option.
77 	bool	rs485;  member
89 	{ "TS-5x00 AMD Elan", 0xb14 },
95 	int i, ret = -ENODEV;  in ts5500_check_signature()
99 		return -ENOMEM;  in ts5500_check_signature()
120 		return -EBUSY;  in ts5500_detect_config()
122 	sbc->id = inb(TS5500_PRODUCT_CODE_ADDR);  in ts5500_detect_config()
123 	if (sbc->id == TS5500_PRODUCT_CODE) {  in ts5500_detect_config()
124 		sbc->name = "TS-5500";  in ts5500_detect_config()
125 	} else if (sbc->id == TS5400_PRODUCT_CODE) {  in ts5500_detect_config()
126 		sbc->name = "TS-5400";  in ts5500_detect_config()
128 		pr_err("ts5500: unknown product code 0x%x\n", sbc->id);  in ts5500_detect_config()
129 		ret = -ENODEV;  in ts5500_detect_config()
134 	sbc->sram = tmp & TS5500_SRAM;  in ts5500_detect_config()
135 	sbc->rs485 = tmp & TS5500_RS485;  in ts5500_detect_config()
136 	sbc->adc = tmp & TS5500_ADC;  in ts5500_detect_config()
139 	sbc->ereset = tmp & TS5500_ERESET;  in ts5500_detect_config()
140 	sbc->itr = tmp & TS5500_ITR;  in ts5500_detect_config()
143 	sbc->jumpers = tmp & ~TS5500_LED;  in ts5500_detect_config()
155 	return sprintf(buf, "%s\n", sbc->name);  in name_show()
164 	return sprintf(buf, "0x%.2x\n", sbc->id);  in id_show()
173 	return sprintf(buf, "0x%.2x\n", sbc->jumpers >> 1);  in jumpers_show()
183 		return sprintf(buf, "%d\n", sbc->_field);		\
188 TS5500_ATTR_BOOL(rs485);
214 	.name = "ts5500-dio1",
215 	.id = -1,
225 	.name = "ts5500-dio2",
226 	.id = -1,
258 	 * otherwise we have to re-initiate a conversion.  in ts5500_adc_convert()
262 		return -EBUSY;  in ts5500_adc_convert()
277 	.id = -1,
291 	 * only the BIOS provides a 16-bit identification call.  in ts5500_init()
298 	pdev = platform_device_register_simple("ts5500", -1, NULL, 0);  in ts5500_init()
302 	sbc = devm_kzalloc(&pdev->dev, sizeof(struct ts5500_sbc), GFP_KERNEL);  in ts5500_init()
304 		err = -ENOMEM;  in ts5500_init()
314 	err = sysfs_create_group(&pdev->dev.kobj, &ts5500_attr_group);  in ts5500_init()
318 	if (sbc->id == TS5500_PRODUCT_CODE) {  in ts5500_init()
319 		ts5500_dio1_pdev.dev.parent = &pdev->dev;  in ts5500_init()
321 			dev_warn(&pdev->dev, "DIO1 block registration failed\n");  in ts5500_init()
322 		ts5500_dio2_pdev.dev.parent = &pdev->dev;  in ts5500_init()
324 			dev_warn(&pdev->dev, "DIO2 block registration failed\n");  in ts5500_init()
327 	if (led_classdev_register(&pdev->dev, &ts5500_led_cdev))  in ts5500_init()
328 		dev_warn(&pdev->dev, "LED registration failed\n");  in ts5500_init()
330 	if (sbc->adc) {  in ts5500_init()
331 		ts5500_adc_pdev.dev.parent = &pdev->dev;  in ts5500_init()
333 			dev_warn(&pdev->dev, "ADC registration failed\n");  in ts5500_init()