*
* Copyright (C) 2005 James Chapman (ds1337 core)
* Copyright (C) 2006 David Brownell
+ * Copyright (C) 2009 Matthias Fuchs (rx8025 support)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
ds_1339,
ds_1340,
m41t00,
+ rx_8025,
// rs5c372 too? different address...
};
#define DS1339_REG_ALARM1_SECS 0x07
#define DS1339_REG_TRICKLE 0x10
+#define RX8025_REG_CTRL1 0x0e
+# define RX8025_BIT_2412 0x20
+#define RX8025_REG_CTRL2 0x0f
+# define RX8025_BIT_PON 0x10
+# define RX8025_BIT_VDET 0x40
+# define RX8025_BIT_XST 0x20
struct ds1307 {
struct i2c_client *client;
struct rtc_device *rtc;
struct work_struct work;
+ s32 (*read_block_data)(struct i2c_client *client, u8 command,
+ u8 length, u8 *values);
+ s32 (*write_block_data)(struct i2c_client *client, u8 command,
+ u8 length, const u8 *values);
};
struct chip_desc {
[ds_1340] = {
},
[m41t00] = {
+},
+[rx_8025] = {
}, };
static const struct i2c_device_id ds1307_id[] = {
{ "ds1339", ds_1339 },
{ "ds1340", ds_1340 },
{ "m41t00", m41t00 },
+ { "rx8025", rx_8025 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ds1307_id);
/*----------------------------------------------------------------------*/
+#define BLOCK_DATA_MAX_TRIES 10
+
+static s32 ds1307_read_block_data_once(struct i2c_client *client, u8 command,
+ u8 length, u8 *values)
+{
+ s32 i, data;
+
+ for (i = 0; i < length; i++) {
+ data = i2c_smbus_read_byte_data(client, command + i);
+ if (data < 0)
+ return data;
+ values[i] = data;
+ }
+ return i;
+}
+
+static s32 ds1307_read_block_data(struct i2c_client *client, u8 command,
+ u8 length, u8 *values)
+{
+ u8 oldvalues[I2C_SMBUS_BLOCK_MAX];
+ s32 ret;
+ int tries = 0;
+
+ dev_dbg(&client->dev, "ds1307_read_block_data (length=%d)\n", length);
+ ret = ds1307_read_block_data_once(client, command, length, values);
+ if (ret < 0)
+ return ret;
+ do {
+ if (++tries > BLOCK_DATA_MAX_TRIES) {
+ dev_err(&client->dev,
+ "ds1307_read_block_data failed\n");
+ return -EIO;
+ }
+ memcpy(oldvalues, values, length);
+ ret = ds1307_read_block_data_once(client, command, length,
+ values);
+ if (ret < 0)
+ return ret;
+ } while (memcmp(oldvalues, values, length));
+ return length;
+}
+
+static s32 ds1307_write_block_data(struct i2c_client *client, u8 command,
+ u8 length, const u8 *values)
+{
+ u8 currvalues[I2C_SMBUS_BLOCK_MAX];
+ int tries = 0;
+
+ dev_dbg(&client->dev, "ds1307_write_block_data (length=%d)\n", length);
+ do {
+ s32 i, ret;
+
+ if (++tries > BLOCK_DATA_MAX_TRIES) {
+ dev_err(&client->dev,
+ "ds1307_write_block_data failed\n");
+ return -EIO;
+ }
+ for (i = 0; i < length; i++) {
+ ret = i2c_smbus_write_byte_data(client, command + i,
+ values[i]);
+ if (ret < 0)
+ return ret;
+ }
+ ret = ds1307_read_block_data_once(client, command, length,
+ currvalues);
+ if (ret < 0)
+ return ret;
+ } while (memcmp(currvalues, values, length));
+ return length;
+}
+
+/*----------------------------------------------------------------------*/
+
/*
* The IRQ logic includes a "real" handler running in IRQ context just
* long enough to schedule this workqueue entry. We need a task context
int tmp;
/* read the RTC date and time registers all at once */
- tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
+ tmp = ds1307->read_block_data(ds1307->client,
DS1307_REG_SECS, 7, ds1307->regs);
if (tmp != 7) {
dev_err(dev, "%s error %d\n", "read", tmp);
"write", buf[0], buf[1], buf[2], buf[3],
buf[4], buf[5], buf[6]);
- result = i2c_smbus_write_i2c_block_data(ds1307->client, 0, 7, buf);
+ result = ds1307->write_block_data(ds1307->client, 0, 7, buf);
if (result < 0) {
dev_err(dev, "%s error %d\n", "write", result);
return result;
return -EINVAL;
/* read all ALARM1, ALARM2, and status registers at once */
- ret = i2c_smbus_read_i2c_block_data(client,
+ ret = ds1307->read_block_data(client,
DS1339_REG_ALARM1_SECS, 9, ds1307->regs);
if (ret != 9) {
dev_err(dev, "%s error %d\n", "alarm read", ret);
t->enabled, t->pending);
/* read current status of both alarms and the chip */
- ret = i2c_smbus_read_i2c_block_data(client,
+ ret = ds1307->read_block_data(client,
DS1339_REG_ALARM1_SECS, 9, buf);
if (ret != 9) {
dev_err(dev, "%s error %d\n", "alarm write", ret);
}
buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I);
- ret = i2c_smbus_write_i2c_block_data(client,
+ ret = ds1307->write_block_data(client,
DS1339_REG_ALARM1_SECS, 9, buf);
if (ret < 0) {
dev_err(dev, "can't set alarm time\n");
if (unlikely(!count))
return count;
- result = i2c_smbus_read_i2c_block_data(client, 8 + off, count, buf);
+ result = ds1307->read_block_data(client, 8 + off, count, buf);
if (result < 0)
dev_err(&client->dev, "%s error %d\n", "nvram read", result);
return result;
char *buf, loff_t off, size_t count)
{
struct i2c_client *client;
+ struct ds1307 *ds1307;
int result;
client = kobj_to_i2c_client(kobj);
+ ds1307 = i2c_get_clientdata(client);
if (unlikely(off >= NVRAM_SIZE))
return -EFBIG;
if (unlikely(!count))
return count;
- result = i2c_smbus_write_i2c_block_data(client, 8 + off, count, buf);
+ result = ds1307->write_block_data(client, 8 + off, count, buf);
if (result < 0) {
dev_err(&client->dev, "%s error %d\n", "nvram write", result);
return result;
int want_irq = false;
unsigned char *buf;
- if (!i2c_check_functionality(adapter,
- I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
- I2C_FUNC_SMBUS_I2C_BLOCK))
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)
+ && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
return -EIO;
if (!(ds1307 = kzalloc(sizeof(struct ds1307), GFP_KERNEL)))
i2c_set_clientdata(client, ds1307);
ds1307->type = id->driver_data;
buf = ds1307->regs;
+ if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
+ ds1307->read_block_data = i2c_smbus_read_i2c_block_data;
+ ds1307->write_block_data = i2c_smbus_write_i2c_block_data;
+ } else {
+ ds1307->read_block_data = ds1307_read_block_data;
+ ds1307->write_block_data = ds1307_write_block_data;
+ }
switch (ds1307->type) {
case ds_1337:
want_irq = true;
}
/* get registers that the "rtc" read below won't read... */
- tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
+ tmp = ds1307->read_block_data(ds1307->client,
DS1337_REG_CONTROL, 2, buf);
if (tmp != 2) {
pr_debug("read error %d\n", tmp);
dev_warn(&client->dev, "SET TIME!\n");
}
break;
+
+ case rx_8025:
+ tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
+ RX8025_REG_CTRL1 << 4 | 0x08, 2, buf);
+ if (tmp != 2) {
+ pr_debug("read error %d\n", tmp);
+ err = -EIO;
+ goto exit_free;
+ }
+
+ /* oscillator off? turn it on, so clock can tick. */
+ if (!(ds1307->regs[1] & RX8025_BIT_XST)) {
+ ds1307->regs[1] |= RX8025_BIT_XST;
+ i2c_smbus_write_byte_data(client,
+ RX8025_REG_CTRL2 << 4 | 0x08,
+ ds1307->regs[1]);
+ dev_warn(&client->dev,
+ "oscillator stop detected - SET TIME!\n");
+ }
+
+ if (ds1307->regs[1] & RX8025_BIT_PON) {
+ ds1307->regs[1] &= ~RX8025_BIT_PON;
+ i2c_smbus_write_byte_data(client,
+ RX8025_REG_CTRL2 << 4 | 0x08,
+ ds1307->regs[1]);
+ dev_warn(&client->dev, "power-on detected\n");
+ }
+
+ if (ds1307->regs[1] & RX8025_BIT_VDET) {
+ ds1307->regs[1] &= ~RX8025_BIT_VDET;
+ i2c_smbus_write_byte_data(client,
+ RX8025_REG_CTRL2 << 4 | 0x08,
+ ds1307->regs[1]);
+ dev_warn(&client->dev, "voltage drop detected\n");
+ }
+
+ /* make sure we are running in 24hour mode */
+ if (!(ds1307->regs[0] & RX8025_BIT_2412)) {
+ u8 hour;
+
+ /* switch to 24 hour mode */
+ i2c_smbus_write_byte_data(client,
+ RX8025_REG_CTRL1 << 4 | 0x08,
+ ds1307->regs[0] |
+ RX8025_BIT_2412);
+
+ tmp = i2c_smbus_read_i2c_block_data(ds1307->client,
+ RX8025_REG_CTRL1 << 4 | 0x08, 2, buf);
+ if (tmp != 2) {
+ pr_debug("read error %d\n", tmp);
+ err = -EIO;
+ goto exit_free;
+ }
+
+ /* correct hour */
+ hour = bcd2bin(ds1307->regs[DS1307_REG_HOUR]);
+ if (hour == 12)
+ hour = 0;
+ if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM)
+ hour += 12;
+
+ i2c_smbus_write_byte_data(client,
+ DS1307_REG_HOUR << 4 | 0x08,
+ hour);
+ }
+ break;
default:
break;
}
read_rtc:
/* read RTC registers */
- tmp = i2c_smbus_read_i2c_block_data(ds1307->client, 0, 8, buf);
+ tmp = ds1307->read_block_data(ds1307->client, 0, 8, buf);
if (tmp != 8) {
pr_debug("read error %d\n", tmp);
err = -EIO;
dev_warn(&client->dev, "SET TIME!\n");
}
break;
+ case rx_8025:
case ds_1337:
case ds_1339:
break;
* systems that will run through year 2100.
*/
break;
+ case rx_8025:
+ break;
default:
if (!(tmp & DS1307_BIT_12HR))
break;
git.openpandora.org / pandora-kernel.git / blobdiff