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drivers/mfd/ab3100-otp.c
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/* * 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> |
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#include <linux/slab.h> |
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#include <linux/init.h> #include <linux/platform_device.h> |
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#include <linux/mfd/abx500.h> |
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#include <linux/debugfs.h> |
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#include <linux/seq_file.h> |
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/* 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 |
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* @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; |
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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) { |
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u8 otpval[8]; u8 otpp; int err; |
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err = abx500_get_register_interruptible(otp->dev, 0, AB3100_OTPP, &otpp); |
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if (err) { dev_err(otp->dev, "unable to read OTPP register "); return err; } |
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err = abx500_get_register_page_interruptible(otp->dev, 0, AB3100_OTP0, otpval, 8); |
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if (err) { dev_err(otp->dev, "unable to read OTP register page "); 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. */ |
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#ifdef CONFIG_DEBUG_FS static int ab3100_show_otp(struct seq_file *s, void *v) |
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{ struct ab3100_otp *otp = s->private; |
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seq_printf(s, "OTP is %s ", otp->locked ? "LOCKED" : "UNLOCKED"); seq_printf(s, "OTP clock switch startup is %uHz ", otp->freq); seq_printf(s, "PAF is %s ", otp->paf ? "SET" : "NOT SET"); seq_printf(s, "IMEI is %s ", otp->imeich ? "CHANGEABLE" : "NOT CHANGEABLE"); seq_printf(s, "CID: 0x%04x (decimal: %d) ", otp->cid, otp->cid); seq_printf(s, "IMEI: %u-%u-%u ", otp->tac, otp->fac, otp->svn); return 0; } static int ab3100_otp_open(struct inode *inode, struct file *file) { |
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return single_open(file, ab3100_show_otp, inode->i_private); |
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} 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! "); |
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return -ENOENT; |
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} |
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return 0; |
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} static void __exit ab3100_otp_exit_debugfs(struct ab3100_otp *otp) { |
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debugfs_remove(otp->debugfs); |
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} #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 ", 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 = kzalloc(sizeof(struct ab3100_otp), GFP_KERNEL); if (!otp) { dev_err(&pdev->dev, "could not allocate AB3100 OTP device "); return -ENOMEM; } otp->dev = &pdev->dev; /* Replace platform data coming in with a local struct */ |
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platform_set_drvdata(pdev, otp); err = ab3100_otp_read(otp); if (err) |
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goto err_otp_read; |
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dev_info(&pdev->dev, "AB3100 OTP readout registered "); /* sysfs entries */ for (i = 0; i < ARRAY_SIZE(ab3100_otp_attrs); i++) { err = device_create_file(&pdev->dev, &ab3100_otp_attrs[i]); if (err) |
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goto err_create_file; |
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} /* debugfs entries */ err = ab3100_otp_init_debugfs(&pdev->dev, otp); if (err) |
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goto err_init_debugfs; |
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return 0; |
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err_init_debugfs: err_create_file: while (--i >= 0) device_remove_file(&pdev->dev, &ab3100_otp_attrs[i]); err_otp_read: |
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kfree(otp); 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); kfree(otp); return 0; } static struct platform_driver ab3100_otp_driver = { .driver = { .name = "ab3100-otp", .owner = THIS_MODULE, }, .remove = __exit_p(ab3100_otp_remove), }; static int __init ab3100_otp_init(void) { return platform_driver_probe(&ab3100_otp_driver, ab3100_otp_probe); } static void __exit ab3100_otp_exit(void) { platform_driver_unregister(&ab3100_otp_driver); } module_init(ab3100_otp_init); module_exit(ab3100_otp_exit); MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>"); MODULE_DESCRIPTION("AB3100 OTP Readout Driver"); MODULE_LICENSE("GPL"); |