x86: Add TS-5500 platform support

The Technologic Systems TS-5500 is an x86-based (AMD Elan SC520) single board computer. This driver registers most of its devices and exposes sysfs attributes for information such as jumpers' state or presence of some of its options. This driver currently registers the TS-5500 platform, its on-board LED, 2 pin blocks (GPIO) and its analog/digital converter. It can be extended to support other Technologic Systems products, such as the TS-5600. Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Savoir-faire Linux Inc. <kernel@savoirfairelinux.com> Link: http://lkml.kernel.org/r/1357334294-12760-1-git-send-email-vivien.didelot@savoirfairelinux.com Signed-off-by: Ingo Molnar <mingo@kernel.org>

x86: Add TS-5500 platform support
The Technologic Systems TS-5500 is an x86-based (AMD Elan SC520) single board computer. This driver registers most of its devices and exposes sysfs attributes for information such as jumpers' state or presence of some of its options. This driver currently registers the TS-5500 platform, its on-board LED, 2 pin blocks (GPIO) and its analog/digital converter. It can be extended to support other Technologic Systems products, such as the TS-5600. Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Savoir-faire Linux Inc. <kernel@savoirfairelinux.com> Link: http://lkml.kernel.org/r/1357334294-12760-1-git-send-email-vivien.didelot@savoirfairelinux.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Vivien Didelot · Ingo Molnar
1 parent 479a99a8e5
Showing 6 changed files with 402 additions and 0 deletions Side-by-side Diff
Documentation/ABI/testing/sysfs-platform-ts5500
MAINTAINERS
arch/x86/Kconfig
arch/x86/platform/Makefile
arch/x86/platform/ts5500/Makefile
arch/x86/platform/ts5500/ts5500.c
+What:		/sys/devices/platform/ts5500/adc
+Date:		January 2013
+KernelVersion:	3.7
+Contact:	"Savoir-faire Linux Inc." <kernel@savoirfairelinux.com>
+Description:
+		Indicates the presence of an A/D Converter. If it is present,
+		it will display "1", otherwise "0".
+
+What:		/sys/devices/platform/ts5500/ereset
+Date:		January 2013
+KernelVersion:	3.7
+Contact:	"Savoir-faire Linux Inc." <kernel@savoirfairelinux.com>
+Description:
+		Indicates the presence of an external reset. If it is present,
+		it will display "1", otherwise "0".
+
+What:		/sys/devices/platform/ts5500/id
+Date:		January 2013
+KernelVersion:	3.7
+Contact:	"Savoir-faire Linux Inc." <kernel@savoirfairelinux.com>
+Description:
+		Product ID of the TS board. TS-5500 ID is 0x60.
+
+What:		/sys/devices/platform/ts5500/jumpers
+Date:		January 2013
+KernelVersion:	3.7
+Contact:	"Savoir-faire Linux Inc." <kernel@savoirfairelinux.com>
+Description:
+		Bitfield showing the jumpers' state. If a jumper is present,
+		the corresponding bit is set. For instance, 0x0e means jumpers
+		2, 3 and 4 are set.
+
+What:		/sys/devices/platform/ts5500/rs485
+Date:		January 2013
+KernelVersion:	3.7
+Contact:	"Savoir-faire Linux Inc." <kernel@savoirfairelinux.com>
+Description:
+		Indicates the presence of the RS485 option. If it is present,
+		it will display "1", otherwise "0".
+
+What:		/sys/devices/platform/ts5500/sram
+Date:		January 2013
+KernelVersion:	3.7
+Contact:	"Savoir-faire Linux Inc." <kernel@savoirfairelinux.com>
+Description:
+		Indicates the presence of the SRAM option. If it is present,
+		it will display "1", otherwise "0".
@@ -7543,6 +7543,11 @@
 F:	include/linux/if_team.h
 F:	include/uapi/linux/if_team.h
  
+TECHNOLOGIC SYSTEMS TS-5500 PLATFORM SUPPORT
+M:	Savoir-faire Linux Inc. <kernel@savoirfairelinux.com>
+S:	Maintained
+F:	arch/x86/platform/ts5500/
+
 TECHNOTREND USB IR RECEIVER
 M:	Sean Young <sean@mess.org>
 L:	linux-media@vger.kernel.org
@@ -2199,6 +2199,15 @@
 	---help---
 	  This option enables system support for the Traverse Technologies GEOS.
  
+config TS5500
+	bool "Technologic Systems TS-5500 platform support"
+	depends on MELAN
+	select CHECK_SIGNATURE
+	select NEW_LEDS
+	select LEDS_CLASS
+	---help---
+	  This option enables system support for the Technologic Systems TS-5500.
+
 endif # X86_32
  
 config AMD_NB
@@ -8,6 +8,7 @@
 obj-y	+= olpc/
 obj-y	+= scx200/
 obj-y	+= sfi/
+obj-y	+= ts5500/
 obj-y	+= visws/
 obj-y	+= uv/
+obj-$(CONFIG_TS5500)	+= ts5500.o
+/*
+ * Technologic Systems TS-5500 Single Board Computer support
+ *
+ * Copyright (C) 2013 Savoir-faire Linux Inc.
+ *	Vivien Didelot <vivien.didelot@savoirfairelinux.com>
+ *
+ * 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.
+ *
+ *
+ * This driver registers the Technologic Systems TS-5500 Single Board Computer
+ * (SBC) and its devices, and exposes information to userspace such as jumpers'
+ * state or available options. For further information about sysfs entries, see
+ * Documentation/ABI/testing/sysfs-platform-ts5500.
+ *
+ * This code actually supports the TS-5500 platform, but it may be extended to
+ * support similar Technologic Systems x86-based platforms, such as the TS-5600.
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_data/gpio-ts5500.h>
+#include <linux/platform_data/max197.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/* Product code register */
+#define TS5500_PRODUCT_CODE_ADDR	0x74
+#define TS5500_PRODUCT_CODE		0x60	/* TS-5500 product code */
+
+/* SRAM/RS-485/ADC options, and RS-485 RTS/Automatic RS-485 flags register */
+#define TS5500_SRAM_RS485_ADC_ADDR	0x75
+#define TS5500_SRAM			BIT(0)	/* SRAM option */
+#define TS5500_RS485			BIT(1)	/* RS-485 option */
+#define TS5500_ADC			BIT(2)	/* A/D converter option */
+#define TS5500_RS485_RTS		BIT(6)	/* RTS for RS-485 */
+#define TS5500_RS485_AUTO		BIT(7)	/* Automatic RS-485 */
+
+/* External Reset/Industrial Temperature Range options register */
+#define TS5500_ERESET_ITR_ADDR		0x76
+#define TS5500_ERESET			BIT(0)	/* External Reset option */
+#define TS5500_ITR			BIT(1)	/* Indust. Temp. Range option */
+
+/* LED/Jumpers register */
+#define TS5500_LED_JP_ADDR		0x77
+#define TS5500_LED			BIT(0)	/* LED flag */
+#define TS5500_JP1			BIT(1)	/* Automatic CMOS */
+#define TS5500_JP2			BIT(2)	/* Enable Serial Console */
+#define TS5500_JP3			BIT(3)	/* Write Enable Drive A */
+#define TS5500_JP4			BIT(4)	/* Fast Console (115K baud) */
+#define TS5500_JP5			BIT(5)	/* User Jumper */
+#define TS5500_JP6			BIT(6)	/* Console on COM1 (req. JP2) */
+#define TS5500_JP7			BIT(7)	/* Undocumented (Unused) */
+
+/* A/D Converter registers */
+#define TS5500_ADC_CONV_BUSY_ADDR	0x195	/* Conversion state register */
+#define TS5500_ADC_CONV_BUSY		BIT(0)
+#define TS5500_ADC_CONV_INIT_LSB_ADDR	0x196	/* Start conv. / LSB register */
+#define TS5500_ADC_CONV_MSB_ADDR	0x197	/* MSB register */
+#define TS5500_ADC_CONV_DELAY		12	/* usec */
+
+/**
+ * struct ts5500_sbc - TS-5500 board description
+ * @id:		Board product ID.
+ * @sram:	Flag for SRAM option.
+ * @rs485:	Flag for RS-485 option.
+ * @adc:	Flag for Analog/Digital converter option.
+ * @ereset:	Flag for External Reset option.
+ * @itr:	Flag for Industrial Temperature Range option.
+ * @jumpers:	Bitfield for jumpers' state.
+ */
+struct ts5500_sbc {
+	int	id;
+	bool	sram;
+	bool	rs485;
+	bool	adc;
+	bool	ereset;
+	bool	itr;
+	u8	jumpers;
+};
+
+/* Board signatures in BIOS shadow RAM */
+static const struct {
+	const char * const string;
+	const ssize_t offset;
+} ts5500_signatures[] __initdata = {
+	{ "TS-5x00 AMD Elan", 0xb14 },
+};
+
+static int __init ts5500_check_signature(void)
+{
+	void __iomem *bios;
+	int i, ret = -ENODEV;
+
+	bios = ioremap(0xf0000, 0x10000);
+	if (!bios)
+		return -ENOMEM;
+
+	for (i = 0; i < ARRAY_SIZE(ts5500_signatures); i++) {
+		if (check_signature(bios + ts5500_signatures[i].offset,
+				    ts5500_signatures[i].string,
+				    strlen(ts5500_signatures[i].string))) {
+			ret = 0;
+			break;
+		}
+	}
+
+	iounmap(bios);
+	return ret;
+}
+
+static int __init ts5500_detect_config(struct ts5500_sbc *sbc)
+{
+	u8 tmp;
+	int ret = 0;
+
+	if (!request_region(TS5500_PRODUCT_CODE_ADDR, 4, "ts5500"))
+		return -EBUSY;
+
+	tmp = inb(TS5500_PRODUCT_CODE_ADDR);
+	if (tmp != TS5500_PRODUCT_CODE) {
+		pr_err("This platform is not a TS-5500 (found ID 0x%x)\n", tmp);
+		ret = -ENODEV;
+		goto cleanup;
+	}
+	sbc->id = tmp;
+
+	tmp = inb(TS5500_SRAM_RS485_ADC_ADDR);
+	sbc->sram = tmp & TS5500_SRAM;
+	sbc->rs485 = tmp & TS5500_RS485;
+	sbc->adc = tmp & TS5500_ADC;
+
+	tmp = inb(TS5500_ERESET_ITR_ADDR);
+	sbc->ereset = tmp & TS5500_ERESET;
+	sbc->itr = tmp & TS5500_ITR;
+
+	tmp = inb(TS5500_LED_JP_ADDR);
+	sbc->jumpers = tmp & ~TS5500_LED;
+
+cleanup:
+	release_region(TS5500_PRODUCT_CODE_ADDR, 4);
+	return ret;
+}
+
+static ssize_t ts5500_show_id(struct device *dev,
+			      struct device_attribute *attr, char *buf)
+{
+	struct ts5500_sbc *sbc = dev_get_drvdata(dev);
+
+	return sprintf(buf, "0x%.2x\n", sbc->id);
+}
+
+static ssize_t ts5500_show_jumpers(struct device *dev,
+				   struct device_attribute *attr,
+				   char *buf)
+{
+	struct ts5500_sbc *sbc = dev_get_drvdata(dev);
+
+	return sprintf(buf, "0x%.2x\n", sbc->jumpers >> 1);
+}
+
+#define TS5500_SHOW(field)					\
+	static ssize_t ts5500_show_##field(struct device *dev,	\
+			struct device_attribute *attr,		\
+			char *buf)				\
+	{							\
+		struct ts5500_sbc *sbc = dev_get_drvdata(dev);	\
+		return sprintf(buf, "%d\n", sbc->field);	\
+	}
+
+TS5500_SHOW(sram)
+TS5500_SHOW(rs485)
+TS5500_SHOW(adc)
+TS5500_SHOW(ereset)
+TS5500_SHOW(itr)
+
+static DEVICE_ATTR(id, S_IRUGO, ts5500_show_id, NULL);
+static DEVICE_ATTR(jumpers, S_IRUGO, ts5500_show_jumpers, NULL);
+static DEVICE_ATTR(sram, S_IRUGO, ts5500_show_sram, NULL);
+static DEVICE_ATTR(rs485, S_IRUGO, ts5500_show_rs485, NULL);
+static DEVICE_ATTR(adc, S_IRUGO, ts5500_show_adc, NULL);
+static DEVICE_ATTR(ereset, S_IRUGO, ts5500_show_ereset, NULL);
+static DEVICE_ATTR(itr, S_IRUGO, ts5500_show_itr, NULL);
+
+static struct attribute *ts5500_attributes[] = {
+	&dev_attr_id.attr,
+	&dev_attr_jumpers.attr,
+	&dev_attr_sram.attr,
+	&dev_attr_rs485.attr,
+	&dev_attr_adc.attr,
+	&dev_attr_ereset.attr,
+	&dev_attr_itr.attr,
+	NULL
+};
+
+static const struct attribute_group ts5500_attr_group = {
+	.attrs = ts5500_attributes,
+};
+
+static struct resource ts5500_dio1_resource[] = {
+	DEFINE_RES_IRQ_NAMED(7, "DIO1 interrupt"),
+};
+
+static struct platform_device ts5500_dio1_pdev = {
+	.name = "ts5500-dio1",
+	.id = -1,
+	.resource = ts5500_dio1_resource,
+	.num_resources = 1,
+};
+
+static struct resource ts5500_dio2_resource[] = {
+	DEFINE_RES_IRQ_NAMED(6, "DIO2 interrupt"),
+};
+
+static struct platform_device ts5500_dio2_pdev = {
+	.name = "ts5500-dio2",
+	.id = -1,
+	.resource = ts5500_dio2_resource,
+	.num_resources = 1,
+};
+
+static void ts5500_led_set(struct led_classdev *led_cdev,
+			   enum led_brightness brightness)
+{
+	outb(!!brightness, TS5500_LED_JP_ADDR);
+}
+
+static enum led_brightness ts5500_led_get(struct led_classdev *led_cdev)
+{
+	return (inb(TS5500_LED_JP_ADDR) & TS5500_LED) ? LED_FULL : LED_OFF;
+}
+
+static struct led_classdev ts5500_led_cdev = {
+	.name = "ts5500:green:",
+	.brightness_set = ts5500_led_set,
+	.brightness_get = ts5500_led_get,
+};
+
+static int ts5500_adc_convert(u8 ctrl)
+{
+	u8 lsb, msb;
+
+	/* Start conversion (ensure the 3 MSB are set to 0) */
+	outb(ctrl & 0x1f, TS5500_ADC_CONV_INIT_LSB_ADDR);
+
+	/*
+	 * The platform has CPLD logic driving the A/D converter.
+	 * The conversion must complete within 11 microseconds,
+	 * otherwise we have to re-initiate a conversion.
+	 */
+	udelay(TS5500_ADC_CONV_DELAY);
+	if (inb(TS5500_ADC_CONV_BUSY_ADDR) & TS5500_ADC_CONV_BUSY)
+		return -EBUSY;
+
+	/* Read the raw data */
+	lsb = inb(TS5500_ADC_CONV_INIT_LSB_ADDR);
+	msb = inb(TS5500_ADC_CONV_MSB_ADDR);
+
+	return (msb << 8) | lsb;
+}
+
+static struct max197_platform_data ts5500_adc_pdata = {
+	.convert = ts5500_adc_convert,
+};
+
+static struct platform_device ts5500_adc_pdev = {
+	.name = "max197",
+	.id = -1,
+	.dev = {
+		.platform_data = &ts5500_adc_pdata,
+	},
+};
+
+static int __init ts5500_init(void)
+{
+	struct platform_device *pdev;
+	struct ts5500_sbc *sbc;
+	int err;
+
+	/*
+	 * There is no DMI available or PCI bridge subvendor info,
+	 * only the BIOS provides a 16-bit identification call.
+	 * It is safer to find a signature in the BIOS shadow RAM.
+	 */
+	err = ts5500_check_signature();
+	if (err)
+		return err;
+
+	pdev = platform_device_register_simple("ts5500", -1, NULL, 0);
+	if (IS_ERR(pdev))
+		return PTR_ERR(pdev);
+
+	sbc = devm_kzalloc(&pdev->dev, sizeof(struct ts5500_sbc), GFP_KERNEL);
+	if (!sbc) {
+		err = -ENOMEM;
+		goto error;
+	}
+
+	err = ts5500_detect_config(sbc);
+	if (err)
+		goto error;
+
+	platform_set_drvdata(pdev, sbc);
+
+	err = sysfs_create_group(&pdev->dev.kobj, &ts5500_attr_group);
+	if (err)
+		goto error;
+
+	ts5500_dio1_pdev.dev.parent = &pdev->dev;
+	if (platform_device_register(&ts5500_dio1_pdev))
+		dev_warn(&pdev->dev, "DIO1 block registration failed\n");
+	ts5500_dio2_pdev.dev.parent = &pdev->dev;
+	if (platform_device_register(&ts5500_dio2_pdev))
+		dev_warn(&pdev->dev, "DIO2 block registration failed\n");
+
+	if (led_classdev_register(&pdev->dev, &ts5500_led_cdev))
+		dev_warn(&pdev->dev, "LED registration failed\n");
+
+	if (sbc->adc) {
+		ts5500_adc_pdev.dev.parent = &pdev->dev;
+		if (platform_device_register(&ts5500_adc_pdev))
+			dev_warn(&pdev->dev, "ADC registration failed\n");
+	}
+
+	return 0;
+error:
+	platform_device_unregister(pdev);
+	return err;
+}
+device_initcall(ts5500_init);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Savoir-faire Linux Inc. <kernel@savoirfairelinux.com>");
+MODULE_DESCRIPTION("Technologic Systems TS-5500 platform driver");
	1	+What: /sys/devices/platform/ts5500/adc
	2	+Date: January 2013
	3	+KernelVersion: 3.7
	4	+Contact: "Savoir-faire Linux Inc." <kernel@savoirfairelinux.com>
	5	+Description:
	6	+ Indicates the presence of an A/D Converter. If it is present,
	7	+ it will display "1", otherwise "0".
	8	+
	9	+What: /sys/devices/platform/ts5500/ereset
	10	+Date: January 2013
	11	+KernelVersion: 3.7
	12	+Contact: "Savoir-faire Linux Inc." <kernel@savoirfairelinux.com>
	13	+Description:
	14	+ Indicates the presence of an external reset. If it is present,
	15	+ it will display "1", otherwise "0".
	16	+
	17	+What: /sys/devices/platform/ts5500/id
	18	+Date: January 2013
	19	+KernelVersion: 3.7
	20	+Contact: "Savoir-faire Linux Inc." <kernel@savoirfairelinux.com>
	21	+Description:
	22	+ Product ID of the TS board. TS-5500 ID is 0x60.
	23	+
	24	+What: /sys/devices/platform/ts5500/jumpers
	25	+Date: January 2013
	26	+KernelVersion: 3.7
	27	+Contact: "Savoir-faire Linux Inc." <kernel@savoirfairelinux.com>
	28	+Description:
	29	+ Bitfield showing the jumpers' state. If a jumper is present,
	30	+ the corresponding bit is set. For instance, 0x0e means jumpers
	31	+ 2, 3 and 4 are set.
	32	+
	33	+What: /sys/devices/platform/ts5500/rs485
	34	+Date: January 2013
	35	+KernelVersion: 3.7
	36	+Contact: "Savoir-faire Linux Inc." <kernel@savoirfairelinux.com>
	37	+Description:
	38	+ Indicates the presence of the RS485 option. If it is present,
	39	+ it will display "1", otherwise "0".
	40	+
	41	+What: /sys/devices/platform/ts5500/sram
	42	+Date: January 2013
	43	+KernelVersion: 3.7
	44	+Contact: "Savoir-faire Linux Inc." <kernel@savoirfairelinux.com>
	45	+Description:
	46	+ Indicates the presence of the SRAM option. If it is present,
	47	+ it will display "1", otherwise "0".
...	...	@@ -7543,6 +7543,11 @@
7543	7543	F: include/linux/if_team.h
7544	7544	F: include/uapi/linux/if_team.h
7545	7545
	7546	+TECHNOLOGIC SYSTEMS TS-5500 PLATFORM SUPPORT
	7547	+M: Savoir-faire Linux Inc. <kernel@savoirfairelinux.com>
	7548	+S: Maintained
	7549	+F: arch/x86/platform/ts5500/
	7550	+
7546	7551	TECHNOTREND USB IR RECEIVER
7547	7552	M: Sean Young <sean@mess.org>
7548	7553	L: linux-media@vger.kernel.org
...	...	@@ -2199,6 +2199,15 @@
2199	2199	---help---
2200	2200	This option enables system support for the Traverse Technologies GEOS.
2201	2201
	2202	+config TS5500
	2203	+ bool "Technologic Systems TS-5500 platform support"
	2204	+ depends on MELAN
	2205	+ select CHECK_SIGNATURE
	2206	+ select NEW_LEDS
	2207	+ select LEDS_CLASS
	2208	+ ---help---
	2209	+ This option enables system support for the Technologic Systems TS-5500.
	2210	+
2202	2211	endif # X86_32
2203	2212
2204	2213	config AMD_NB
...	...	@@ -8,6 +8,7 @@
8	8	obj-y += olpc/
9	9	obj-y += scx200/
10	10	obj-y += sfi/
	11	+obj-y += ts5500/
11	12	obj-y += visws/
12	13	obj-y += uv/
	1	+/*
	2	+ * Technologic Systems TS-5500 Single Board Computer support
	3	+ *
	4	+ * Copyright (C) 2013 Savoir-faire Linux Inc.
	5	+ * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
	6	+ *
	7	+ * This program is free software; you can redistribute it and/or modify it under
	8	+ * the terms of the GNU General Public License as published by the Free Software
	9	+ * Foundation; either version 2 of the License, or (at your option) any later
	10	+ * version.
	11	+ *
	12	+ *
	13	+ * This driver registers the Technologic Systems TS-5500 Single Board Computer
	14	+ * (SBC) and its devices, and exposes information to userspace such as jumpers'
	15	+ * state or available options. For further information about sysfs entries, see
	16	+ * Documentation/ABI/testing/sysfs-platform-ts5500.
	17	+ *
	18	+ * This code actually supports the TS-5500 platform, but it may be extended to
	19	+ * support similar Technologic Systems x86-based platforms, such as the TS-5600.
	20	+ */
	21	+
	22	+#include <linux/delay.h>
	23	+#include <linux/io.h>
	24	+#include <linux/kernel.h>
	25	+#include <linux/leds.h>
	26	+#include <linux/module.h>
	27	+#include <linux/platform_data/gpio-ts5500.h>
	28	+#include <linux/platform_data/max197.h>
	29	+#include <linux/platform_device.h>
	30	+#include <linux/slab.h>
	31	+
	32	+/* Product code register */
	33	+#define TS5500_PRODUCT_CODE_ADDR 0x74
	34	+#define TS5500_PRODUCT_CODE 0x60 /* TS-5500 product code */
	35	+
	36	+/* SRAM/RS-485/ADC options, and RS-485 RTS/Automatic RS-485 flags register */
	37	+#define TS5500_SRAM_RS485_ADC_ADDR 0x75
	38	+#define TS5500_SRAM BIT(0) /* SRAM option */
	39	+#define TS5500_RS485 BIT(1) /* RS-485 option */
	40	+#define TS5500_ADC BIT(2) /* A/D converter option */
	41	+#define TS5500_RS485_RTS BIT(6) /* RTS for RS-485 */
	42	+#define TS5500_RS485_AUTO BIT(7) /* Automatic RS-485 */
	43	+
	44	+/* External Reset/Industrial Temperature Range options register */
	45	+#define TS5500_ERESET_ITR_ADDR 0x76
	46	+#define TS5500_ERESET BIT(0) /* External Reset option */
	47	+#define TS5500_ITR BIT(1) /* Indust. Temp. Range option */
	48	+
	49	+/* LED/Jumpers register */
	50	+#define TS5500_LED_JP_ADDR 0x77
	51	+#define TS5500_LED BIT(0) /* LED flag */
	52	+#define TS5500_JP1 BIT(1) /* Automatic CMOS */
	53	+#define TS5500_JP2 BIT(2) /* Enable Serial Console */
	54	+#define TS5500_JP3 BIT(3) /* Write Enable Drive A */
	55	+#define TS5500_JP4 BIT(4) /* Fast Console (115K baud) */
	56	+#define TS5500_JP5 BIT(5) /* User Jumper */
	57	+#define TS5500_JP6 BIT(6) /* Console on COM1 (req. JP2) */
	58	+#define TS5500_JP7 BIT(7) /* Undocumented (Unused) */
	59	+
	60	+/* A/D Converter registers */
	61	+#define TS5500_ADC_CONV_BUSY_ADDR 0x195 /* Conversion state register */
	62	+#define TS5500_ADC_CONV_BUSY BIT(0)
	63	+#define TS5500_ADC_CONV_INIT_LSB_ADDR 0x196 /* Start conv. / LSB register */
	64	+#define TS5500_ADC_CONV_MSB_ADDR 0x197 /* MSB register */
	65	+#define TS5500_ADC_CONV_DELAY 12 /* usec */
	66	+
	67	+/**
	68	+ * struct ts5500_sbc - TS-5500 board description
	69	+ * @id: Board product ID.
	70	+ * @sram: Flag for SRAM option.
	71	+ * @rs485: Flag for RS-485 option.
	72	+ * @adc: Flag for Analog/Digital converter option.
	73	+ * @ereset: Flag for External Reset option.
	74	+ * @itr: Flag for Industrial Temperature Range option.
	75	+ * @jumpers: Bitfield for jumpers' state.
	76	+ */
	77	+struct ts5500_sbc {
	78	+ int id;
	79	+ bool sram;
	80	+ bool rs485;
	81	+ bool adc;
	82	+ bool ereset;
	83	+ bool itr;
	84	+ u8 jumpers;
	85	+};
	86	+
	87	+/* Board signatures in BIOS shadow RAM */
	88	+static const struct {
	89	+ const char * const string;
	90	+ const ssize_t offset;
	91	+} ts5500_signatures[] __initdata = {
	92	+ { "TS-5x00 AMD Elan", 0xb14 },
	93	+};
	94	+
	95	+static int __init ts5500_check_signature(void)
	96	+{
	97	+ void __iomem *bios;
	98	+ int i, ret = -ENODEV;
	99	+
	100	+ bios = ioremap(0xf0000, 0x10000);
	101	+ if (!bios)
	102	+ return -ENOMEM;
	103	+
	104	+ for (i = 0; i < ARRAY_SIZE(ts5500_signatures); i++) {
	105	+ if (check_signature(bios + ts5500_signatures[i].offset,
	106	+ ts5500_signatures[i].string,
	107	+ strlen(ts5500_signatures[i].string))) {
	108	+ ret = 0;
	109	+ break;
	110	+ }
	111	+ }
	112	+
	113	+ iounmap(bios);
	114	+ return ret;
	115	+}
	116	+
	117	+static int __init ts5500_detect_config(struct ts5500_sbc *sbc)
	118	+{
	119	+ u8 tmp;
	120	+ int ret = 0;
	121	+
	122	+ if (!request_region(TS5500_PRODUCT_CODE_ADDR, 4, "ts5500"))
	123	+ return -EBUSY;
	124	+
	125	+ tmp = inb(TS5500_PRODUCT_CODE_ADDR);
	126	+ if (tmp != TS5500_PRODUCT_CODE) {
	127	+ pr_err("This platform is not a TS-5500 (found ID 0x%x)\n", tmp);
	128	+ ret = -ENODEV;
	129	+ goto cleanup;
	130	+ }
	131	+ sbc->id = tmp;
	132	+
	133	+ tmp = inb(TS5500_SRAM_RS485_ADC_ADDR);
	134	+ sbc->sram = tmp & TS5500_SRAM;
	135	+ sbc->rs485 = tmp & TS5500_RS485;
	136	+ sbc->adc = tmp & TS5500_ADC;
	137	+
	138	+ tmp = inb(TS5500_ERESET_ITR_ADDR);
	139	+ sbc->ereset = tmp & TS5500_ERESET;
	140	+ sbc->itr = tmp & TS5500_ITR;
	141	+
	142	+ tmp = inb(TS5500_LED_JP_ADDR);
	143	+ sbc->jumpers = tmp & ~TS5500_LED;
	144	+
	145	+cleanup:
	146	+ release_region(TS5500_PRODUCT_CODE_ADDR, 4);
	147	+ return ret;
	148	+}
	149	+
	150	+static ssize_t ts5500_show_id(struct device *dev,
	151	+ struct device_attribute attr, char buf)
	152	+{
	153	+ struct ts5500_sbc *sbc = dev_get_drvdata(dev);
	154	+
	155	+ return sprintf(buf, "0x%.2x\n", sbc->id);
	156	+}
	157	+
	158	+static ssize_t ts5500_show_jumpers(struct device *dev,
	159	+ struct device_attribute *attr,
	160	+ char *buf)
	161	+{
	162	+ struct ts5500_sbc *sbc = dev_get_drvdata(dev);
	163	+
	164	+ return sprintf(buf, "0x%.2x\n", sbc->jumpers >> 1);
	165	+}
	166	+
	167	+#define TS5500_SHOW(field) \
	168	+ static ssize_t ts5500_show_##field(struct device *dev, \
	169	+ struct device_attribute *attr, \
	170	+ char *buf) \
	171	+ { \
	172	+ struct ts5500_sbc *sbc = dev_get_drvdata(dev); \
	173	+ return sprintf(buf, "%d\n", sbc->field); \
	174	+ }
	175	+
	176	+TS5500_SHOW(sram)
	177	+TS5500_SHOW(rs485)
	178	+TS5500_SHOW(adc)
	179	+TS5500_SHOW(ereset)
	180	+TS5500_SHOW(itr)
	181	+
	182	+static DEVICE_ATTR(id, S_IRUGO, ts5500_show_id, NULL);
	183	+static DEVICE_ATTR(jumpers, S_IRUGO, ts5500_show_jumpers, NULL);
	184	+static DEVICE_ATTR(sram, S_IRUGO, ts5500_show_sram, NULL);
	185	+static DEVICE_ATTR(rs485, S_IRUGO, ts5500_show_rs485, NULL);
	186	+static DEVICE_ATTR(adc, S_IRUGO, ts5500_show_adc, NULL);
	187	+static DEVICE_ATTR(ereset, S_IRUGO, ts5500_show_ereset, NULL);
	188	+static DEVICE_ATTR(itr, S_IRUGO, ts5500_show_itr, NULL);
	189	+
	190	+static struct attribute *ts5500_attributes[] = {
	191	+ &dev_attr_id.attr,
	192	+ &dev_attr_jumpers.attr,
	193	+ &dev_attr_sram.attr,
	194	+ &dev_attr_rs485.attr,
	195	+ &dev_attr_adc.attr,
	196	+ &dev_attr_ereset.attr,
	197	+ &dev_attr_itr.attr,
	198	+ NULL
	199	+};
	200	+
	201	+static const struct attribute_group ts5500_attr_group = {
	202	+ .attrs = ts5500_attributes,
	203	+};
	204	+
	205	+static struct resource ts5500_dio1_resource[] = {
	206	+ DEFINE_RES_IRQ_NAMED(7, "DIO1 interrupt"),
	207	+};
	208	+
	209	+static struct platform_device ts5500_dio1_pdev = {
	210	+ .name = "ts5500-dio1",
	211	+ .id = -1,
	212	+ .resource = ts5500_dio1_resource,
	213	+ .num_resources = 1,
	214	+};
	215	+
	216	+static struct resource ts5500_dio2_resource[] = {
	217	+ DEFINE_RES_IRQ_NAMED(6, "DIO2 interrupt"),
	218	+};
	219	+
	220	+static struct platform_device ts5500_dio2_pdev = {
	221	+ .name = "ts5500-dio2",
	222	+ .id = -1,
	223	+ .resource = ts5500_dio2_resource,
	224	+ .num_resources = 1,
	225	+};
	226	+
	227	+static void ts5500_led_set(struct led_classdev *led_cdev,
	228	+ enum led_brightness brightness)
	229	+{
	230	+ outb(!!brightness, TS5500_LED_JP_ADDR);
	231	+}
	232	+
	233	+static enum led_brightness ts5500_led_get(struct led_classdev *led_cdev)
	234	+{
	235	+ return (inb(TS5500_LED_JP_ADDR) & TS5500_LED) ? LED_FULL : LED_OFF;
	236	+}
	237	+
	238	+static struct led_classdev ts5500_led_cdev = {
	239	+ .name = "ts5500:green:",
	240	+ .brightness_set = ts5500_led_set,
	241	+ .brightness_get = ts5500_led_get,
	242	+};
	243	+
	244	+static int ts5500_adc_convert(u8 ctrl)
	245	+{
	246	+ u8 lsb, msb;
	247	+
	248	+ /* Start conversion (ensure the 3 MSB are set to 0) */
	249	+ outb(ctrl & 0x1f, TS5500_ADC_CONV_INIT_LSB_ADDR);
	250	+
	251	+ /*
	252	+ * The platform has CPLD logic driving the A/D converter.
	253	+ * The conversion must complete within 11 microseconds,
	254	+ * otherwise we have to re-initiate a conversion.
	255	+ */
	256	+ udelay(TS5500_ADC_CONV_DELAY);
	257	+ if (inb(TS5500_ADC_CONV_BUSY_ADDR) & TS5500_ADC_CONV_BUSY)
	258	+ return -EBUSY;
	259	+
	260	+ /* Read the raw data */
	261	+ lsb = inb(TS5500_ADC_CONV_INIT_LSB_ADDR);
	262	+ msb = inb(TS5500_ADC_CONV_MSB_ADDR);
	263	+
	264	+ return (msb << 8) \| lsb;
	265	+}
	266	+
	267	+static struct max197_platform_data ts5500_adc_pdata = {
	268	+ .convert = ts5500_adc_convert,
	269	+};
	270	+
	271	+static struct platform_device ts5500_adc_pdev = {
	272	+ .name = "max197",
	273	+ .id = -1,
	274	+ .dev = {
	275	+ .platform_data = &ts5500_adc_pdata,
	276	+ },
	277	+};
	278	+
	279	+static int __init ts5500_init(void)
	280	+{
	281	+ struct platform_device *pdev;
	282	+ struct ts5500_sbc *sbc;
	283	+ int err;
	284	+
	285	+ /*
	286	+ * There is no DMI available or PCI bridge subvendor info,
	287	+ * only the BIOS provides a 16-bit identification call.
	288	+ * It is safer to find a signature in the BIOS shadow RAM.
	289	+ */
	290	+ err = ts5500_check_signature();
	291	+ if (err)
	292	+ return err;
	293	+
	294	+ pdev = platform_device_register_simple("ts5500", -1, NULL, 0);
	295	+ if (IS_ERR(pdev))
	296	+ return PTR_ERR(pdev);
	297	+
	298	+ sbc = devm_kzalloc(&pdev->dev, sizeof(struct ts5500_sbc), GFP_KERNEL);
	299	+ if (!sbc) {
	300	+ err = -ENOMEM;
	301	+ goto error;
	302	+ }
	303	+
	304	+ err = ts5500_detect_config(sbc);
	305	+ if (err)
	306	+ goto error;
	307	+
	308	+ platform_set_drvdata(pdev, sbc);
	309	+
	310	+ err = sysfs_create_group(&pdev->dev.kobj, &ts5500_attr_group);
	311	+ if (err)
	312	+ goto error;
	313	+
	314	+ ts5500_dio1_pdev.dev.parent = &pdev->dev;
	315	+ if (platform_device_register(&ts5500_dio1_pdev))
	316	+ dev_warn(&pdev->dev, "DIO1 block registration failed\n");
	317	+ ts5500_dio2_pdev.dev.parent = &pdev->dev;
	318	+ if (platform_device_register(&ts5500_dio2_pdev))
	319	+ dev_warn(&pdev->dev, "DIO2 block registration failed\n");
	320	+
	321	+ if (led_classdev_register(&pdev->dev, &ts5500_led_cdev))
	322	+ dev_warn(&pdev->dev, "LED registration failed\n");
	323	+
	324	+ if (sbc->adc) {
	325	+ ts5500_adc_pdev.dev.parent = &pdev->dev;
	326	+ if (platform_device_register(&ts5500_adc_pdev))
	327	+ dev_warn(&pdev->dev, "ADC registration failed\n");
	328	+ }
	329	+
	330	+ return 0;
	331	+error:
	332	+ platform_device_unregister(pdev);
	333	+ return err;
	334	+}
	335	+device_initcall(ts5500_init);
	336	+
	337	+MODULE_LICENSE("GPL");
	338	+MODULE_AUTHOR("Savoir-faire Linux Inc. <kernel@savoirfairelinux.com>");
	339	+MODULE_DESCRIPTION("Technologic Systems TS-5500 platform driver");