Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 | /* rtc-bq4802.c: TI BQ4802 RTC driver. * * Copyright (C) 2008 David S. Miller <davem@davemloft.net> */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/io.h> #include <linux/platform_device.h> #include <linux/rtc.h> #include <linux/bcd.h> #include <linux/slab.h> MODULE_AUTHOR("David S. Miller <davem@davemloft.net>"); MODULE_DESCRIPTION("TI BQ4802 RTC driver"); MODULE_LICENSE("GPL"); struct bq4802 { void __iomem *regs; unsigned long ioport; struct rtc_device *rtc; spinlock_t lock; struct resource *r; u8 (*read)(struct bq4802 *, int); void (*write)(struct bq4802 *, int, u8); }; static u8 bq4802_read_io(struct bq4802 *p, int off) { return inb(p->ioport + off); } static void bq4802_write_io(struct bq4802 *p, int off, u8 val) { outb(val, p->ioport + off); } static u8 bq4802_read_mem(struct bq4802 *p, int off) { return readb(p->regs + off); } static void bq4802_write_mem(struct bq4802 *p, int off, u8 val) { writeb(val, p->regs + off); } static int bq4802_read_time(struct device *dev, struct rtc_time *tm) { struct platform_device *pdev = to_platform_device(dev); struct bq4802 *p = platform_get_drvdata(pdev); unsigned long flags; unsigned int century; u8 val; spin_lock_irqsave(&p->lock, flags); val = p->read(p, 0x0e); p->write(p, 0xe, val | 0x08); tm->tm_sec = p->read(p, 0x00); tm->tm_min = p->read(p, 0x02); tm->tm_hour = p->read(p, 0x04); tm->tm_mday = p->read(p, 0x06); tm->tm_mon = p->read(p, 0x09); tm->tm_year = p->read(p, 0x0a); tm->tm_wday = p->read(p, 0x08); century = p->read(p, 0x0f); p->write(p, 0x0e, val); spin_unlock_irqrestore(&p->lock, flags); tm->tm_sec = bcd2bin(tm->tm_sec); tm->tm_min = bcd2bin(tm->tm_min); tm->tm_hour = bcd2bin(tm->tm_hour); tm->tm_mday = bcd2bin(tm->tm_mday); tm->tm_mon = bcd2bin(tm->tm_mon); tm->tm_year = bcd2bin(tm->tm_year); tm->tm_wday = bcd2bin(tm->tm_wday); century = bcd2bin(century); tm->tm_year += (century * 100); tm->tm_year -= 1900; tm->tm_mon--; return 0; } static int bq4802_set_time(struct device *dev, struct rtc_time *tm) { struct platform_device *pdev = to_platform_device(dev); struct bq4802 *p = platform_get_drvdata(pdev); u8 sec, min, hrs, day, mon, yrs, century, val; unsigned long flags; unsigned int year; year = tm->tm_year + 1900; century = year / 100; yrs = year % 100; mon = tm->tm_mon + 1; /* tm_mon starts at zero */ day = tm->tm_mday; hrs = tm->tm_hour; min = tm->tm_min; sec = tm->tm_sec; sec = bin2bcd(sec); min = bin2bcd(min); hrs = bin2bcd(hrs); day = bin2bcd(day); mon = bin2bcd(mon); yrs = bin2bcd(yrs); century = bin2bcd(century); spin_lock_irqsave(&p->lock, flags); val = p->read(p, 0x0e); p->write(p, 0x0e, val | 0x08); p->write(p, 0x00, sec); p->write(p, 0x02, min); p->write(p, 0x04, hrs); p->write(p, 0x06, day); p->write(p, 0x09, mon); p->write(p, 0x0a, yrs); p->write(p, 0x0f, century); p->write(p, 0x0e, val); spin_unlock_irqrestore(&p->lock, flags); return 0; } static const struct rtc_class_ops bq4802_ops = { .read_time = bq4802_read_time, .set_time = bq4802_set_time, }; static int bq4802_probe(struct platform_device *pdev) { struct bq4802 *p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL); int err = -ENOMEM; if (!p) goto out; spin_lock_init(&p->lock); p->r = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!p->r) { p->r = platform_get_resource(pdev, IORESOURCE_IO, 0); err = -EINVAL; if (!p->r) goto out; } if (p->r->flags & IORESOURCE_IO) { p->ioport = p->r->start; p->read = bq4802_read_io; p->write = bq4802_write_io; } else if (p->r->flags & IORESOURCE_MEM) { p->regs = devm_ioremap(&pdev->dev, p->r->start, resource_size(p->r)); p->read = bq4802_read_mem; p->write = bq4802_write_mem; } else { err = -EINVAL; goto out; } platform_set_drvdata(pdev, p); p->rtc = devm_rtc_device_register(&pdev->dev, "bq4802", &bq4802_ops, THIS_MODULE); if (IS_ERR(p->rtc)) { err = PTR_ERR(p->rtc); goto out; } err = 0; out: return err; } static int bq4802_remove(struct platform_device *pdev) { platform_set_drvdata(pdev, NULL); return 0; } /* work with hotplug and coldplug */ MODULE_ALIAS("platform:rtc-bq4802"); static struct platform_driver bq4802_driver = { .driver = { .name = "rtc-bq4802", .owner = THIS_MODULE, }, .probe = bq4802_probe, .remove = bq4802_remove, }; module_platform_driver(bq4802_driver); |