arch/x86/platform/ts5500/ts5500.c - third_party/linux - Git at Google

 /*
  * Technologic Systems TS-5500 Single Board Computer support
  *
  * Copyright (C) 2013-2014 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 may be extended to support similar x86-based platforms.
  * Actually, the TS-5500 and TS-5400 are supported.
  */

 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/leds.h>
 #include <linux/init.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 */
 #define TS5400_PRODUCT_CODE		0x40	/* TS-5400 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
  * @name:	Board model name.
  * @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 {
 	const char *name;
 	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[] __initconst = {
 	{ "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;

 	sbc->id = inb(TS5500_PRODUCT_CODE_ADDR);
 	if (sbc->id == TS5500_PRODUCT_CODE) {
 		sbc->name = "TS-5500";
 	} else if (sbc->id == TS5400_PRODUCT_CODE) {
 		sbc->name = "TS-5400";
 	} else {
 		pr_err("ts5500: unknown product code 0x%x\n", sbc->id);
 		ret = -ENODEV;
 		goto cleanup;
 	}

 	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 name_show(struct device *dev, struct device_attribute *attr,
 		char *buf)
 {
 	struct ts5500_sbc *sbc = dev_get_drvdata(dev);

 	return sprintf(buf, "%s\n", sbc->name);
 }
 static DEVICE_ATTR_RO(name);

 static ssize_t id_show(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 DEVICE_ATTR_RO(id);

 static ssize_t jumpers_show(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);
 }
 static DEVICE_ATTR_RO(jumpers);

 #define TS5500_ATTR_BOOL(_field)					\
 	static ssize_t _field##_show(struct device *dev,		\
 			struct device_attribute *attr, char *buf)	\
 	{								\
 		struct ts5500_sbc *sbc = dev_get_drvdata(dev);		\
 									\
 		return sprintf(buf, "%d\n", sbc->_field);		\
 	}								\
 	static DEVICE_ATTR_RO(_field)

 TS5500_ATTR_BOOL(sram);
 TS5500_ATTR_BOOL(rs485);
 TS5500_ATTR_BOOL(adc);
 TS5500_ATTR_BOOL(ereset);
 TS5500_ATTR_BOOL(itr);

 static struct attribute *ts5500_attributes[] = {
 	&dev_attr_id.attr,
 	&dev_attr_name.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;

 	if (sbc->id == TS5500_PRODUCT_CODE) {
 		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);
	/*
	* Technologic Systems TS-5500 Single Board Computer support
	*
	* Copyright (C) 2013-2014 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 may be extended to support similar x86-based platforms.
	* Actually, the TS-5500 and TS-5400 are supported.
	*/

	#include <linux/delay.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/leds.h>
	#include <linux/init.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 */
	#define TS5400_PRODUCT_CODE 0x40 /* TS-5400 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
	* @name: Board model name.
	* @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 {
	const char *name;
	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[] __initconst = {
	{ "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;

	sbc->id = inb(TS5500_PRODUCT_CODE_ADDR);
	if (sbc->id == TS5500_PRODUCT_CODE) {
	sbc->name = "TS-5500";
	} else if (sbc->id == TS5400_PRODUCT_CODE) {
	sbc->name = "TS-5400";
	} else {
	pr_err("ts5500: unknown product code 0x%x\n", sbc->id);
	ret = -ENODEV;
	goto cleanup;
	}

	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 name_show(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct ts5500_sbc *sbc = dev_get_drvdata(dev);

	return sprintf(buf, "%s\n", sbc->name);
	}
	static DEVICE_ATTR_RO(name);

	static ssize_t id_show(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 DEVICE_ATTR_RO(id);

	static ssize_t jumpers_show(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);
	}
	static DEVICE_ATTR_RO(jumpers);

	#define TS5500_ATTR_BOOL(_field) \
	static ssize_t _field##_show(struct device *dev, \
	struct device_attribute attr, char buf) \
	{ \
	struct ts5500_sbc *sbc = dev_get_drvdata(dev); \
	\
	return sprintf(buf, "%d\n", sbc->_field); \
	} \
	static DEVICE_ATTR_RO(_field)

	TS5500_ATTR_BOOL(sram);
	TS5500_ATTR_BOOL(rs485);
	TS5500_ATTR_BOOL(adc);
	TS5500_ATTR_BOOL(ereset);
	TS5500_ATTR_BOOL(itr);

	static struct attribute *ts5500_attributes[] = {
	&dev_attr_id.attr,
	&dev_attr_name.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;

	if (sbc->id == TS5500_PRODUCT_CODE) {
	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);