static int __init ds1302_rtc_probe(struct platform_device *pdev)
{
struct rtc_device *rtc;
if (ds1302_hw_init()) {
dev_err(&pdev->dev, "Failed to init communication channel");
return -EINVAL;
}
/* Reset */
ds1302_reset();
/* Write a magic value to the DS1302 RAM, and see if it sticks. */
ds1302_writebyte(RTC_ADDR_RAM0, 0x42);
if (ds1302_readbyte(RTC_ADDR_RAM0) != 0x42) {
dev_err(&pdev->dev, "Failed to probe");
return -ENODEV;
}
rtc = rtc_device_register("ds1302", &pdev->dev,
&ds1302_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc))
return PTR_ERR(rtc);
platform_set_drvdata(pdev, rtc);
return 0;
}
void __init secureedge5410_rtc_init(void)
{
unsigned char *test = "snapgear";
int i;
ds1302_reset();
use_ds1302 = 1;
for (i = 0; test[i]; i++)
ds1302_writebyte(32 + i, test[i]);
for (i = 0; test[i]; i++)
if (ds1302_readbyte(32 + i) != test[i]) {
use_ds1302 = 0;
break;
}
if (use_ds1302) {
rtc_sh_get_time = snapgear_rtc_gettimeofday;
rtc_sh_set_time = snapgear_rtc_settimeofday;
}
printk("SnapGear RTC: using %s rtc.\n", use_ds1302 ? "ds1302" : "internal");
}
static void ds1302_writebyte(unsigned int addr, unsigned int val)
{
ds1302_reset();
ds1302_start();
ds1302_sendbits(((addr & 0x3f) << 1) | RTC_CMD_WRITE);
ds1302_sendbits(val);
ds1302_stop();
}
static int __init ds1302_init(void)
{
misc_register(&ds1302_dev);
printk ("DS1302: Copyright (C) 2001, Greg Ungerer "
"([email protected])\n");
ds1302_reset();
return 0;
}
static unsigned int ds1302_readbyte(unsigned int addr)
{
unsigned int val;
ds1302_reset();
ds1302_start();
ds1302_sendbits(((addr & 0x3f) << 1) | RTC_CMD_READ);
val = ds1302_recvbits();
ds1302_stop();
return val;
}
static int16 ds1302_read_temp(void)
{
uint8 temp_data[2]; // ¶Á³öζÈÔÝ·Å
int16 temp;
ds1302_reset();
ds1302_write_byte(0xCC); // Skip ROM cmd
ds1302_write_byte(0xBE); // read
temp_data[0] = ds1302_read_byte(); // low 8 bits
temp_data[1] = ds1302_read_byte(); // high 8 bits
temp = temp_data[1];
temp <<= 8;
temp |= temp_data[0];
temp >>= 4;
return temp;
}
static void ds1302_start(void)
{
ds1302_reset();
ds1302_write_byte(0xCC); // Skip ROM cmd
ds1302_write_byte(0x44); // convert cmd
}
