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228 lines
6.6 KiB
228 lines
6.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Oki MSM6242 RTC Driver |
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* |
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* Copyright 2009 Geert Uytterhoeven |
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* |
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* Based on the A2000 TOD code in arch/m68k/amiga/config.c |
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* Copyright (C) 1993 Hamish Macdonald |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/delay.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/rtc.h> |
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#include <linux/slab.h> |
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enum { |
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MSM6242_SECOND1 = 0x0, /* 1-second digit register */ |
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MSM6242_SECOND10 = 0x1, /* 10-second digit register */ |
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MSM6242_MINUTE1 = 0x2, /* 1-minute digit register */ |
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MSM6242_MINUTE10 = 0x3, /* 10-minute digit register */ |
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MSM6242_HOUR1 = 0x4, /* 1-hour digit register */ |
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MSM6242_HOUR10 = 0x5, /* PM/AM, 10-hour digit register */ |
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MSM6242_DAY1 = 0x6, /* 1-day digit register */ |
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MSM6242_DAY10 = 0x7, /* 10-day digit register */ |
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MSM6242_MONTH1 = 0x8, /* 1-month digit register */ |
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MSM6242_MONTH10 = 0x9, /* 10-month digit register */ |
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MSM6242_YEAR1 = 0xa, /* 1-year digit register */ |
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MSM6242_YEAR10 = 0xb, /* 10-year digit register */ |
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MSM6242_WEEK = 0xc, /* Week register */ |
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MSM6242_CD = 0xd, /* Control Register D */ |
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MSM6242_CE = 0xe, /* Control Register E */ |
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MSM6242_CF = 0xf, /* Control Register F */ |
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}; |
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#define MSM6242_HOUR10_AM (0 << 2) |
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#define MSM6242_HOUR10_PM (1 << 2) |
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#define MSM6242_HOUR10_HR_MASK (3 << 0) |
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#define MSM6242_WEEK_SUNDAY 0 |
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#define MSM6242_WEEK_MONDAY 1 |
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#define MSM6242_WEEK_TUESDAY 2 |
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#define MSM6242_WEEK_WEDNESDAY 3 |
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#define MSM6242_WEEK_THURSDAY 4 |
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#define MSM6242_WEEK_FRIDAY 5 |
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#define MSM6242_WEEK_SATURDAY 6 |
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#define MSM6242_CD_30_S_ADJ (1 << 3) /* 30-second adjustment */ |
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#define MSM6242_CD_IRQ_FLAG (1 << 2) |
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#define MSM6242_CD_BUSY (1 << 1) |
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#define MSM6242_CD_HOLD (1 << 0) |
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#define MSM6242_CE_T_MASK (3 << 2) |
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#define MSM6242_CE_T_64HZ (0 << 2) /* period 1/64 second */ |
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#define MSM6242_CE_T_1HZ (1 << 2) /* period 1 second */ |
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#define MSM6242_CE_T_1MINUTE (2 << 2) /* period 1 minute */ |
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#define MSM6242_CE_T_1HOUR (3 << 2) /* period 1 hour */ |
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#define MSM6242_CE_ITRPT_STND (1 << 1) |
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#define MSM6242_CE_MASK (1 << 0) /* STD.P output control */ |
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#define MSM6242_CF_TEST (1 << 3) |
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#define MSM6242_CF_12H (0 << 2) |
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#define MSM6242_CF_24H (1 << 2) |
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#define MSM6242_CF_STOP (1 << 1) |
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#define MSM6242_CF_REST (1 << 0) /* reset */ |
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struct msm6242_priv { |
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u32 __iomem *regs; |
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struct rtc_device *rtc; |
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}; |
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static inline unsigned int msm6242_read(struct msm6242_priv *priv, |
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unsigned int reg) |
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{ |
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return __raw_readl(&priv->regs[reg]) & 0xf; |
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} |
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static inline void msm6242_write(struct msm6242_priv *priv, unsigned int val, |
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unsigned int reg) |
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{ |
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__raw_writel(val, &priv->regs[reg]); |
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} |
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static void msm6242_lock(struct msm6242_priv *priv) |
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{ |
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int cnt = 5; |
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msm6242_write(priv, MSM6242_CD_HOLD|MSM6242_CD_IRQ_FLAG, MSM6242_CD); |
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while ((msm6242_read(priv, MSM6242_CD) & MSM6242_CD_BUSY) && cnt) { |
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msm6242_write(priv, MSM6242_CD_IRQ_FLAG, MSM6242_CD); |
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udelay(70); |
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msm6242_write(priv, MSM6242_CD_HOLD|MSM6242_CD_IRQ_FLAG, MSM6242_CD); |
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cnt--; |
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} |
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if (!cnt) |
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pr_warn("timed out waiting for RTC (0x%x)\n", |
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msm6242_read(priv, MSM6242_CD)); |
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} |
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static void msm6242_unlock(struct msm6242_priv *priv) |
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{ |
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msm6242_write(priv, MSM6242_CD_IRQ_FLAG, MSM6242_CD); |
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} |
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static int msm6242_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct msm6242_priv *priv = dev_get_drvdata(dev); |
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msm6242_lock(priv); |
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tm->tm_sec = msm6242_read(priv, MSM6242_SECOND10) * 10 + |
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msm6242_read(priv, MSM6242_SECOND1); |
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tm->tm_min = msm6242_read(priv, MSM6242_MINUTE10) * 10 + |
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msm6242_read(priv, MSM6242_MINUTE1); |
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tm->tm_hour = (msm6242_read(priv, MSM6242_HOUR10) & |
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MSM6242_HOUR10_HR_MASK) * 10 + |
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msm6242_read(priv, MSM6242_HOUR1); |
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tm->tm_mday = msm6242_read(priv, MSM6242_DAY10) * 10 + |
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msm6242_read(priv, MSM6242_DAY1); |
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tm->tm_wday = msm6242_read(priv, MSM6242_WEEK); |
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tm->tm_mon = msm6242_read(priv, MSM6242_MONTH10) * 10 + |
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msm6242_read(priv, MSM6242_MONTH1) - 1; |
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tm->tm_year = msm6242_read(priv, MSM6242_YEAR10) * 10 + |
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msm6242_read(priv, MSM6242_YEAR1); |
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if (tm->tm_year <= 69) |
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tm->tm_year += 100; |
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if (!(msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)) { |
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unsigned int pm = msm6242_read(priv, MSM6242_HOUR10) & |
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MSM6242_HOUR10_PM; |
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if (!pm && tm->tm_hour == 12) |
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tm->tm_hour = 0; |
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else if (pm && tm->tm_hour != 12) |
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tm->tm_hour += 12; |
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} |
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msm6242_unlock(priv); |
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return 0; |
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} |
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static int msm6242_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct msm6242_priv *priv = dev_get_drvdata(dev); |
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msm6242_lock(priv); |
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msm6242_write(priv, tm->tm_sec / 10, MSM6242_SECOND10); |
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msm6242_write(priv, tm->tm_sec % 10, MSM6242_SECOND1); |
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msm6242_write(priv, tm->tm_min / 10, MSM6242_MINUTE10); |
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msm6242_write(priv, tm->tm_min % 10, MSM6242_MINUTE1); |
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if (msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H) |
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msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10); |
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else if (tm->tm_hour >= 12) |
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msm6242_write(priv, MSM6242_HOUR10_PM + (tm->tm_hour - 12) / 10, |
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MSM6242_HOUR10); |
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else |
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msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10); |
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msm6242_write(priv, tm->tm_hour % 10, MSM6242_HOUR1); |
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msm6242_write(priv, tm->tm_mday / 10, MSM6242_DAY10); |
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msm6242_write(priv, tm->tm_mday % 10, MSM6242_DAY1); |
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if (tm->tm_wday != -1) |
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msm6242_write(priv, tm->tm_wday, MSM6242_WEEK); |
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msm6242_write(priv, (tm->tm_mon + 1) / 10, MSM6242_MONTH10); |
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msm6242_write(priv, (tm->tm_mon + 1) % 10, MSM6242_MONTH1); |
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if (tm->tm_year >= 100) |
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tm->tm_year -= 100; |
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msm6242_write(priv, tm->tm_year / 10, MSM6242_YEAR10); |
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msm6242_write(priv, tm->tm_year % 10, MSM6242_YEAR1); |
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msm6242_unlock(priv); |
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return 0; |
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} |
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static const struct rtc_class_ops msm6242_rtc_ops = { |
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.read_time = msm6242_read_time, |
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.set_time = msm6242_set_time, |
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}; |
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static int __init msm6242_rtc_probe(struct platform_device *pdev) |
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{ |
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struct resource *res; |
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struct msm6242_priv *priv; |
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struct rtc_device *rtc; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!res) |
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return -ENODEV; |
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res)); |
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if (!priv->regs) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, priv); |
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rtc = devm_rtc_device_register(&pdev->dev, "rtc-msm6242", |
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&msm6242_rtc_ops, THIS_MODULE); |
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if (IS_ERR(rtc)) |
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return PTR_ERR(rtc); |
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priv->rtc = rtc; |
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return 0; |
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} |
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static struct platform_driver msm6242_rtc_driver = { |
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.driver = { |
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.name = "rtc-msm6242", |
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}, |
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}; |
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module_platform_driver_probe(msm6242_rtc_driver, msm6242_rtc_probe); |
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MODULE_AUTHOR("Geert Uytterhoeven <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("Oki MSM6242 RTC driver"); |
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MODULE_ALIAS("platform:rtc-msm6242");
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