[deliverable/linux.git] / drivers / mfd / ab3100-otp.c

/*
 * drivers/mfd/ab3100_otp.c
 *
 * Copyright (C) 2007-2009 ST-Ericsson AB
 * License terms: GNU General Public License (GPL) version 2
 * Driver to read out OTP from the AB3100 Mixed-signal circuit
 * Author: Linus Walleij <linus.walleij@stericsson.com>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mfd/abx500.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>

/* The OTP registers */
#define AB3100_OTP0		0xb0
#define AB3100_OTP1		0xb1
#define AB3100_OTP2		0xb2
#define AB3100_OTP3		0xb3
#define AB3100_OTP4		0xb4
#define AB3100_OTP5		0xb5
#define AB3100_OTP6		0xb6
#define AB3100_OTP7		0xb7
#define AB3100_OTPP		0xbf

/**
 * struct ab3100_otp
 * @dev containing device
 * @locked whether the OTP is locked, after locking, no more bits
 *       can be changed but before locking it is still possible
 *       to change bits from 1->0.
 * @freq clocking frequency for the OTP, this frequency is either
 *       32768Hz or 1MHz/30
 * @paf product activation flag, indicates whether this is a real
 *       product (paf true) or a lab board etc (paf false)
 * @imeich if this is set it is possible to override the
 *       IMEI number found in the tac, fac and svn fields with
 *       (secured) software
 * @cid customer ID
 * @tac type allocation code of the IMEI
 * @fac final assembly code of the IMEI
 * @svn software version number of the IMEI
 * @debugfs a debugfs file used when dumping to file
 */
struct ab3100_otp {
	struct device *dev;
	bool locked;
	u32 freq;
	bool paf;
	bool imeich;
	u16 cid:14;
	u32 tac:20;
	u8 fac;
	u32 svn:20;
	struct dentry *debugfs;
};

static int __init ab3100_otp_read(struct ab3100_otp *otp)
{
	u8 otpval[8];
	u8 otpp;
	int err;

	err = abx500_get_register_interruptible(otp->dev, 0,
		AB3100_OTPP, &otpp);
	if (err) {
		dev_err(otp->dev, "unable to read OTPP register\n");
		return err;
	}

	err = abx500_get_register_page_interruptible(otp->dev, 0,
		AB3100_OTP0, otpval, 8);
	if (err) {
		dev_err(otp->dev, "unable to read OTP register page\n");
		return err;
	}

	/* Cache OTP properties, they never change by nature */
	otp->locked = (otpp & 0x80);
	otp->freq = (otpp & 0x40) ? 32768 : 34100;
	otp->paf = (otpval[1] & 0x80);
	otp->imeich = (otpval[1] & 0x40);
	otp->cid = ((otpval[1] << 8) | otpval[0]) & 0x3fff;
	otp->tac = ((otpval[4] & 0x0f) << 16) | (otpval[3] << 8) | otpval[2];
	otp->fac = ((otpval[5] & 0x0f) << 4) | (otpval[4] >> 4);
	otp->svn = (otpval[7] << 12) | (otpval[6] << 4) | (otpval[5] >> 4);
	return 0;
}

/*
 * This is a simple debugfs human-readable file that dumps out
 * the contents of the OTP.
 */
#ifdef CONFIG_DEBUG_FS
static int ab3100_show_otp(struct seq_file *s, void *v)
{
	struct ab3100_otp *otp = s->private;

	seq_printf(s, "OTP is %s\n", otp->locked ? "LOCKED" : "UNLOCKED");
	seq_printf(s, "OTP clock switch startup is %uHz\n", otp->freq);
	seq_printf(s, "PAF is %s\n", otp->paf ? "SET" : "NOT SET");
	seq_printf(s, "IMEI is %s\n", otp->imeich ?
		   "CHANGEABLE" : "NOT CHANGEABLE");
	seq_printf(s, "CID: 0x%04x (decimal: %d)\n", otp->cid, otp->cid);
	seq_printf(s, "IMEI: %u-%u-%u\n", otp->tac, otp->fac, otp->svn);
	return 0;
}

static int ab3100_otp_open(struct inode *inode, struct file *file)
{
	return single_open(file, ab3100_show_otp, inode->i_private);
}

static const struct file_operations ab3100_otp_operations = {
	.open		= ab3100_otp_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int __init ab3100_otp_init_debugfs(struct device *dev,
					  struct ab3100_otp *otp)
{
	otp->debugfs = debugfs_create_file("ab3100_otp", S_IFREG | S_IRUGO,
					   NULL, otp,
					   &ab3100_otp_operations);
	if (!otp->debugfs) {
		dev_err(dev, "AB3100 debugfs OTP file registration failed!\n");
		return -ENOENT;
	}
	return 0;
}

static void __exit ab3100_otp_exit_debugfs(struct ab3100_otp *otp)
{
	debugfs_remove(otp->debugfs);
}
#else
/* Compile this out if debugfs not selected */
static inline int __init ab3100_otp_init_debugfs(struct device *dev,
						 struct ab3100_otp *otp)
{
	return 0;
}

static inline void __exit ab3100_otp_exit_debugfs(struct ab3100_otp *otp)
{
}
#endif

#define SHOW_AB3100_ATTR(name) \
static ssize_t ab3100_otp_##name##_show(struct device *dev, \
			       struct device_attribute *attr, \
			       char *buf) \
{\
	struct ab3100_otp *otp = dev_get_drvdata(dev); \
	return sprintf(buf, "%u\n", otp->name); \
}

SHOW_AB3100_ATTR(locked)
SHOW_AB3100_ATTR(freq)
SHOW_AB3100_ATTR(paf)
SHOW_AB3100_ATTR(imeich)
SHOW_AB3100_ATTR(cid)
SHOW_AB3100_ATTR(fac)
SHOW_AB3100_ATTR(tac)
SHOW_AB3100_ATTR(svn)

static struct device_attribute ab3100_otp_attrs[] = {
	__ATTR(locked, S_IRUGO, ab3100_otp_locked_show, NULL),
	__ATTR(freq, S_IRUGO, ab3100_otp_freq_show, NULL),
	__ATTR(paf, S_IRUGO, ab3100_otp_paf_show, NULL),
	__ATTR(imeich, S_IRUGO, ab3100_otp_imeich_show, NULL),
	__ATTR(cid, S_IRUGO, ab3100_otp_cid_show, NULL),
	__ATTR(fac, S_IRUGO, ab3100_otp_fac_show, NULL),
	__ATTR(tac, S_IRUGO, ab3100_otp_tac_show, NULL),
	__ATTR(svn, S_IRUGO, ab3100_otp_svn_show, NULL),
};

static int __init ab3100_otp_probe(struct platform_device *pdev)
{
	struct ab3100_otp *otp;
	int err = 0;
	int i;

	otp = devm_kzalloc(&pdev->dev, sizeof(struct ab3100_otp), GFP_KERNEL);
	if (!otp) {
		dev_err(&pdev->dev, "could not allocate AB3100 OTP device\n");
		return -ENOMEM;
	}
	otp->dev = &pdev->dev;

	/* Replace platform data coming in with a local struct */
	platform_set_drvdata(pdev, otp);

	err = ab3100_otp_read(otp);
	if (err)
		return err;

	dev_info(&pdev->dev, "AB3100 OTP readout registered\n");

	/* sysfs entries */
	for (i = 0; i < ARRAY_SIZE(ab3100_otp_attrs); i++) {
		err = device_create_file(&pdev->dev,
					 &ab3100_otp_attrs[i]);
		if (err)
			goto err;
	}

	/* debugfs entries */
	err = ab3100_otp_init_debugfs(&pdev->dev, otp);
	if (err)
		goto err;

	return 0;

err:
	while (--i >= 0)
		device_remove_file(&pdev->dev, &ab3100_otp_attrs[i]);
	return err;
}

static int __exit ab3100_otp_remove(struct platform_device *pdev)
{
	struct ab3100_otp *otp = platform_get_drvdata(pdev);
	int i;

	for (i = 0; i < ARRAY_SIZE(ab3100_otp_attrs); i++)
		device_remove_file(&pdev->dev,
				   &ab3100_otp_attrs[i]);
	ab3100_otp_exit_debugfs(otp);
	return 0;
}

static struct platform_driver ab3100_otp_driver = {
	.driver = {
		.name = "ab3100-otp",
		.owner = THIS_MODULE,
	},
	.remove	 = __exit_p(ab3100_otp_remove),
};

module_platform_driver_probe(ab3100_otp_driver, ab3100_otp_probe);

MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
MODULE_DESCRIPTION("AB3100 OTP Readout Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
12992dd8 LW	1	/*
	2	* drivers/mfd/ab3100_otp.c
	3	*
	4	* Copyright (C) 2007-2009 ST-Ericsson AB
	5	* License terms: GNU General Public License (GPL) version 2
	6	* Driver to read out OTP from the AB3100 Mixed-signal circuit
	7	* Author: Linus Walleij <linus.walleij@stericsson.com>
	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/kernel.h>
5a0e3ad6	12	#include <linux/slab.h>
12992dd8 LW	13	#include <linux/init.h>
12992dd8 LW	14	#include <linux/platform_device.h>
812f9e9d	15	#include <linux/mfd/abx500.h>
12992dd8	16	#include <linux/debugfs.h>
ca229f1b	17	#include <linux/seq_file.h>
12992dd8 LW	18
	19	/* The OTP registers */
	20	#define AB3100_OTP0 0xb0
	21	#define AB3100_OTP1 0xb1
	22	#define AB3100_OTP2 0xb2
	23	#define AB3100_OTP3 0xb3
	24	#define AB3100_OTP4 0xb4
	25	#define AB3100_OTP5 0xb5
	26	#define AB3100_OTP6 0xb6
	27	#define AB3100_OTP7 0xb7
	28	#define AB3100_OTPP 0xbf
	29
	30	/**
	31	* struct ab3100_otp
	32	* @dev containing device
12992dd8 LW	33	* @locked whether the OTP is locked, after locking, no more bits
	34	* can be changed but before locking it is still possible
	35	* to change bits from 1->0.
	36	* @freq clocking frequency for the OTP, this frequency is either
	37	* 32768Hz or 1MHz/30
	38	* @paf product activation flag, indicates whether this is a real
	39	* product (paf true) or a lab board etc (paf false)
	40	* @imeich if this is set it is possible to override the
	41	* IMEI number found in the tac, fac and svn fields with
	42	* (secured) software
	43	* @cid customer ID
	44	* @tac type allocation code of the IMEI
	45	* @fac final assembly code of the IMEI
	46	* @svn software version number of the IMEI
	47	* @debugfs a debugfs file used when dumping to file
	48	*/
	49	struct ab3100_otp {
	50	struct device *dev;
12992dd8 LW	51	bool locked;
	52	u32 freq;
	53	bool paf;
	54	bool imeich;
	55	u16 cid:14;
	56	u32 tac:20;
	57	u8 fac;
	58	u32 svn:20;
	59	struct dentry *debugfs;
	60	};
	61
	62	static int __init ab3100_otp_read(struct ab3100_otp *otp)
	63	{
12992dd8 LW	64	u8 otpval[8];
	65	u8 otpp;
	66	int err;
	67
fa661258 MW	68	err = abx500_get_register_interruptible(otp->dev, 0,
fa661258 MW	69	AB3100_OTPP, &otpp);
12992dd8 LW	70	if (err) {
	71	dev_err(otp->dev, "unable to read OTPP register\n");
	72	return err;
	73	}
	74
fa661258 MW	75	err = abx500_get_register_page_interruptible(otp->dev, 0,
fa661258 MW	76	AB3100_OTP0, otpval, 8);
12992dd8 LW	77	if (err) {
	78	dev_err(otp->dev, "unable to read OTP register page\n");
	79	return err;
	80	}
	81
	82	/* Cache OTP properties, they never change by nature */
	83	otp->locked = (otpp & 0x80);
	84	otp->freq = (otpp & 0x40) ? 32768 : 34100;
	85	otp->paf = (otpval[1] & 0x80);
	86	otp->imeich = (otpval[1] & 0x40);
	87	otp->cid = ((otpval[1] << 8) \| otpval[0]) & 0x3fff;
	88	otp->tac = ((otpval[4] & 0x0f) << 16) \| (otpval[3] << 8) \| otpval[2];
	89	otp->fac = ((otpval[5] & 0x0f) << 4) \| (otpval[4] >> 4);
	90	otp->svn = (otpval[7] << 12) \| (otpval[6] << 4) \| (otpval[5] >> 4);
	91	return 0;
	92	}
	93
	94	/*
	95	* This is a simple debugfs human-readable file that dumps out
	96	* the contents of the OTP.
	97	*/
ca229f1b LW	98	#ifdef CONFIG_DEBUG_FS
ca229f1b LW	99	static int ab3100_show_otp(struct seq_file s, void v)
12992dd8 LW	100	{
12992dd8 LW	101	struct ab3100_otp *otp = s->private;
12992dd8 LW	102
	103	seq_printf(s, "OTP is %s\n", otp->locked ? "LOCKED" : "UNLOCKED");
	104	seq_printf(s, "OTP clock switch startup is %uHz\n", otp->freq);
	105	seq_printf(s, "PAF is %s\n", otp->paf ? "SET" : "NOT SET");
	106	seq_printf(s, "IMEI is %s\n", otp->imeich ?
	107	"CHANGEABLE" : "NOT CHANGEABLE");
	108	seq_printf(s, "CID: 0x%04x (decimal: %d)\n", otp->cid, otp->cid);
	109	seq_printf(s, "IMEI: %u-%u-%u\n", otp->tac, otp->fac, otp->svn);
	110	return 0;
	111	}
	112
	113	static int ab3100_otp_open(struct inode inode, struct file file)
	114	{
ca229f1b	115	return single_open(file, ab3100_show_otp, inode->i_private);
12992dd8 LW	116	}
	117
	118	static const struct file_operations ab3100_otp_operations = {
	119	.open = ab3100_otp_open,
	120	.read = seq_read,
	121	.llseek = seq_lseek,
	122	.release = single_release,
	123	};
	124
	125	static int __init ab3100_otp_init_debugfs(struct device *dev,
	126	struct ab3100_otp *otp)
	127	{
	128	otp->debugfs = debugfs_create_file("ab3100_otp", S_IFREG \| S_IRUGO,
	129	NULL, otp,
	130	&ab3100_otp_operations);
	131	if (!otp->debugfs) {
	132	dev_err(dev, "AB3100 debugfs OTP file registration failed!\n");
ca229f1b	133	return -ENOENT;
12992dd8	134	}
ca229f1b	135	return 0;
12992dd8 LW	136	}
	137
	138	static void __exit ab3100_otp_exit_debugfs(struct ab3100_otp *otp)
	139	{
ca229f1b	140	debugfs_remove(otp->debugfs);
12992dd8 LW	141	}
	142	#else
	143	/* Compile this out if debugfs not selected */
	144	static inline int __init ab3100_otp_init_debugfs(struct device *dev,
	145	struct ab3100_otp *otp)
	146	{
	147	return 0;
	148	}
	149
	150	static inline void __exit ab3100_otp_exit_debugfs(struct ab3100_otp *otp)
	151	{
	152	}
	153	#endif
	154
	155	#define SHOW_AB3100_ATTR(name) \
	156	static ssize_t ab3100_otp_##name##_show(struct device *dev, \
	157	struct device_attribute *attr, \
	158	char *buf) \
	159	{\
	160	struct ab3100_otp *otp = dev_get_drvdata(dev); \
	161	return sprintf(buf, "%u\n", otp->name); \
	162	}
	163
	164	SHOW_AB3100_ATTR(locked)
	165	SHOW_AB3100_ATTR(freq)
	166	SHOW_AB3100_ATTR(paf)
	167	SHOW_AB3100_ATTR(imeich)
	168	SHOW_AB3100_ATTR(cid)
	169	SHOW_AB3100_ATTR(fac)
	170	SHOW_AB3100_ATTR(tac)
	171	SHOW_AB3100_ATTR(svn)
	172
	173	static struct device_attribute ab3100_otp_attrs[] = {
	174	__ATTR(locked, S_IRUGO, ab3100_otp_locked_show, NULL),
	175	__ATTR(freq, S_IRUGO, ab3100_otp_freq_show, NULL),
	176	__ATTR(paf, S_IRUGO, ab3100_otp_paf_show, NULL),
	177	__ATTR(imeich, S_IRUGO, ab3100_otp_imeich_show, NULL),
	178	__ATTR(cid, S_IRUGO, ab3100_otp_cid_show, NULL),
	179	__ATTR(fac, S_IRUGO, ab3100_otp_fac_show, NULL),
	180	__ATTR(tac, S_IRUGO, ab3100_otp_tac_show, NULL),
	181	__ATTR(svn, S_IRUGO, ab3100_otp_svn_show, NULL),
	182	};
	183
	184	static int __init ab3100_otp_probe(struct platform_device *pdev)
	185	{
	186	struct ab3100_otp *otp;
	187	int err = 0;
	188	int i;
	189
5feac05d	190	otp = devm_kzalloc(&pdev->dev, sizeof(struct ab3100_otp), GFP_KERNEL);
12992dd8 LW	191	if (!otp) {
	192	dev_err(&pdev->dev, "could not allocate AB3100 OTP device\n");
	193	return -ENOMEM;
	194	}
	195	otp->dev = &pdev->dev;
	196
	197	/* Replace platform data coming in with a local struct */
12992dd8 LW	198	platform_set_drvdata(pdev, otp);
	199
	200	err = ab3100_otp_read(otp);
	201	if (err)
5feac05d	202	return err;
12992dd8 LW	203
	204	dev_info(&pdev->dev, "AB3100 OTP readout registered\n");
	205
	206	/* sysfs entries */
	207	for (i = 0; i < ARRAY_SIZE(ab3100_otp_attrs); i++) {
	208	err = device_create_file(&pdev->dev,
	209	&ab3100_otp_attrs[i]);
	210	if (err)
5feac05d	211	goto err;
12992dd8 LW	212	}
	213
	214	/* debugfs entries */
	215	err = ab3100_otp_init_debugfs(&pdev->dev, otp);
	216	if (err)
5feac05d	217	goto err;
12992dd8 LW	218
	219	return 0;
	220
5feac05d	221	err:
d281b80c AL	222	while (--i >= 0)
d281b80c AL	223	device_remove_file(&pdev->dev, &ab3100_otp_attrs[i]);
12992dd8 LW	224	return err;
	225	}
	226
	227	static int __exit ab3100_otp_remove(struct platform_device *pdev)
	228	{
	229	struct ab3100_otp *otp = platform_get_drvdata(pdev);
	230	int i;
	231
	232	for (i = 0; i < ARRAY_SIZE(ab3100_otp_attrs); i++)
	233	device_remove_file(&pdev->dev,
	234	&ab3100_otp_attrs[i]);
	235	ab3100_otp_exit_debugfs(otp);
12992dd8 LW	236	return 0;
	237	}
	238
	239	static struct platform_driver ab3100_otp_driver = {
	240	.driver = {
	241	.name = "ab3100-otp",
	242	.owner = THIS_MODULE,
	243	},
	244	.remove = __exit_p(ab3100_otp_remove),
	245	};
	246
bbc48c6a	247	module_platform_driver_probe(ab3100_otp_driver, ab3100_otp_probe);
12992dd8 LW	248
	249	MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
	250	MODULE_DESCRIPTION("AB3100 OTP Readout Driver");
	251	MODULE_LICENSE("GPL");