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path: root/drivers/i2c/chips/ds1337.c
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Diffstat (limited to 'drivers/i2c/chips/ds1337.c')
-rw-r--r--drivers/i2c/chips/ds1337.c410
1 files changed, 0 insertions, 410 deletions
diff --git a/drivers/i2c/chips/ds1337.c b/drivers/i2c/chips/ds1337.c
deleted file mode 100644
index ec17d6b..0000000
--- a/drivers/i2c/chips/ds1337.c
+++ /dev/null
@@ -1,410 +0,0 @@
-/*
- * linux/drivers/i2c/chips/ds1337.c
- *
- * Copyright (C) 2005 James Chapman <jchapman@katalix.com>
- *
- * based on linux/drivers/acorn/char/pcf8583.c
- * Copyright (C) 2000 Russell King
- *
- * 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
- * published by the Free Software Foundation.
- *
- * Driver for Dallas Semiconductor DS1337 and DS1339 real time clock chip
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/i2c.h>
-#include <linux/string.h>
-#include <linux/rtc.h> /* get the user-level API */
-#include <linux/bcd.h>
-#include <linux/list.h>
-
-/* Device registers */
-#define DS1337_REG_HOUR 2
-#define DS1337_REG_DAY 3
-#define DS1337_REG_DATE 4
-#define DS1337_REG_MONTH 5
-#define DS1337_REG_CONTROL 14
-#define DS1337_REG_STATUS 15
-
-/* FIXME - how do we export these interface constants? */
-#define DS1337_GET_DATE 0
-#define DS1337_SET_DATE 1
-
-/*
- * Functions declaration
- */
-static unsigned short normal_i2c[] = { 0x68, I2C_CLIENT_END };
-
-I2C_CLIENT_INSMOD_1(ds1337);
-
-static int ds1337_attach_adapter(struct i2c_adapter *adapter);
-static int ds1337_detect(struct i2c_adapter *adapter, int address, int kind);
-static void ds1337_init_client(struct i2c_client *client);
-static int ds1337_detach_client(struct i2c_client *client);
-static int ds1337_command(struct i2c_client *client, unsigned int cmd,
- void *arg);
-
-/*
- * Driver data (common to all clients)
- */
-static struct i2c_driver ds1337_driver = {
- .driver = {
- .name = "ds1337",
- },
- .attach_adapter = ds1337_attach_adapter,
- .detach_client = ds1337_detach_client,
- .command = ds1337_command,
-};
-
-/*
- * Client data (each client gets its own)
- */
-struct ds1337_data {
- struct i2c_client client;
- struct list_head list;
-};
-
-/*
- * Internal variables
- */
-static LIST_HEAD(ds1337_clients);
-
-static inline int ds1337_read(struct i2c_client *client, u8 reg, u8 *value)
-{
- s32 tmp = i2c_smbus_read_byte_data(client, reg);
-
- if (tmp < 0)
- return -EIO;
-
- *value = tmp;
-
- return 0;
-}
-
-/*
- * Chip access functions
- */
-static int ds1337_get_datetime(struct i2c_client *client, struct rtc_time *dt)
-{
- int result;
- u8 buf[7];
- u8 val;
- struct i2c_msg msg[2];
- u8 offs = 0;
-
- if (!dt) {
- dev_dbg(&client->dev, "%s: EINVAL: dt=NULL\n", __FUNCTION__);
- return -EINVAL;
- }
-
- msg[0].addr = client->addr;
- msg[0].flags = 0;
- msg[0].len = 1;
- msg[0].buf = &offs;
-
- msg[1].addr = client->addr;
- msg[1].flags = I2C_M_RD;
- msg[1].len = sizeof(buf);
- msg[1].buf = &buf[0];
-
- result = i2c_transfer(client->adapter, msg, 2);
-
- dev_dbg(&client->dev, "%s: [%d] %02x %02x %02x %02x %02x %02x %02x\n",
- __FUNCTION__, result, buf[0], buf[1], buf[2], buf[3],
- buf[4], buf[5], buf[6]);
-
- if (result == 2) {
- dt->tm_sec = BCD2BIN(buf[0]);
- dt->tm_min = BCD2BIN(buf[1]);
- val = buf[2] & 0x3f;
- dt->tm_hour = BCD2BIN(val);
- dt->tm_wday = BCD2BIN(buf[3]) - 1;
- dt->tm_mday = BCD2BIN(buf[4]);
- val = buf[5] & 0x7f;
- dt->tm_mon = BCD2BIN(val) - 1;
- dt->tm_year = BCD2BIN(buf[6]);
- if (buf[5] & 0x80)
- dt->tm_year += 100;
-
- dev_dbg(&client->dev, "%s: secs=%d, mins=%d, "
- "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n",
- __FUNCTION__, dt->tm_sec, dt->tm_min,
- dt->tm_hour, dt->tm_mday,
- dt->tm_mon, dt->tm_year, dt->tm_wday);
-
- return 0;
- }
-
- dev_err(&client->dev, "error reading data! %d\n", result);
- return -EIO;
-}
-
-static int ds1337_set_datetime(struct i2c_client *client, struct rtc_time *dt)
-{
- int result;
- u8 buf[8];
- u8 val;
- struct i2c_msg msg[1];
-
- if (!dt) {
- dev_dbg(&client->dev, "%s: EINVAL: dt=NULL\n", __FUNCTION__);
- return -EINVAL;
- }
-
- dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
- "mday=%d, mon=%d, year=%d, wday=%d\n", __FUNCTION__,
- dt->tm_sec, dt->tm_min, dt->tm_hour,
- dt->tm_mday, dt->tm_mon, dt->tm_year, dt->tm_wday);
-
- buf[0] = 0; /* reg offset */
- buf[1] = BIN2BCD(dt->tm_sec);
- buf[2] = BIN2BCD(dt->tm_min);
- buf[3] = BIN2BCD(dt->tm_hour);
- buf[4] = BIN2BCD(dt->tm_wday + 1);
- buf[5] = BIN2BCD(dt->tm_mday);
- buf[6] = BIN2BCD(dt->tm_mon + 1);
- val = dt->tm_year;
- if (val >= 100) {
- val -= 100;
- buf[6] |= (1 << 7);
- }
- buf[7] = BIN2BCD(val);
-
- msg[0].addr = client->addr;
- msg[0].flags = 0;
- msg[0].len = sizeof(buf);
- msg[0].buf = &buf[0];
-
- result = i2c_transfer(client->adapter, msg, 1);
- if (result == 1)
- return 0;
-
- dev_err(&client->dev, "error writing data! %d\n", result);
- return -EIO;
-}
-
-static int ds1337_command(struct i2c_client *client, unsigned int cmd,
- void *arg)
-{
- dev_dbg(&client->dev, "%s: cmd=%d\n", __FUNCTION__, cmd);
-
- switch (cmd) {
- case DS1337_GET_DATE:
- return ds1337_get_datetime(client, arg);
-
- case DS1337_SET_DATE:
- return ds1337_set_datetime(client, arg);
-
- default:
- return -EINVAL;
- }
-}
-
-/*
- * Public API for access to specific device. Useful for low-level
- * RTC access from kernel code.
- */
-int ds1337_do_command(int bus, int cmd, void *arg)
-{
- struct list_head *walk;
- struct list_head *tmp;
- struct ds1337_data *data;
-
- list_for_each_safe(walk, tmp, &ds1337_clients) {
- data = list_entry(walk, struct ds1337_data, list);
- if (data->client.adapter->nr == bus)
- return ds1337_command(&data->client, cmd, arg);
- }
-
- return -ENODEV;
-}
-
-static int ds1337_attach_adapter(struct i2c_adapter *adapter)
-{
- return i2c_probe(adapter, &addr_data, ds1337_detect);
-}
-
-/*
- * The following function does more than just detection. If detection
- * succeeds, it also registers the new chip.
- */
-static int ds1337_detect(struct i2c_adapter *adapter, int address, int kind)
-{
- struct i2c_client *new_client;
- struct ds1337_data *data;
- int err = 0;
- const char *name = "";
-
- if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
- I2C_FUNC_I2C))
- goto exit;
-
- if (!(data = kzalloc(sizeof(struct ds1337_data), GFP_KERNEL))) {
- err = -ENOMEM;
- goto exit;
- }
- INIT_LIST_HEAD(&data->list);
-
- /* The common I2C client data is placed right before the
- * DS1337-specific data.
- */
- new_client = &data->client;
- i2c_set_clientdata(new_client, data);
- new_client->addr = address;
- new_client->adapter = adapter;
- new_client->driver = &ds1337_driver;
- new_client->flags = 0;
-
- /*
- * Now we do the remaining detection. A negative kind means that
- * the driver was loaded with no force parameter (default), so we
- * must both detect and identify the chip. A zero kind means that
- * the driver was loaded with the force parameter, the detection
- * step shall be skipped. A positive kind means that the driver
- * was loaded with the force parameter and a given kind of chip is
- * requested, so both the detection and the identification steps
- * are skipped.
- *
- * For detection, we read registers that are most likely to cause
- * detection failure, i.e. those that have more bits with fixed
- * or reserved values.
- */
-
- /* Default to an DS1337 if forced */
- if (kind == 0)
- kind = ds1337;
-
- if (kind < 0) { /* detection and identification */
- u8 data;
-
- /* Check that status register bits 6-2 are zero */
- if ((ds1337_read(new_client, DS1337_REG_STATUS, &data) < 0) ||
- (data & 0x7c))
- goto exit_free;
-
- /* Check for a valid day register value */
- if ((ds1337_read(new_client, DS1337_REG_DAY, &data) < 0) ||
- (data == 0) || (data & 0xf8))
- goto exit_free;
-
- /* Check for a valid date register value */
- if ((ds1337_read(new_client, DS1337_REG_DATE, &data) < 0) ||
- (data == 0) || (data & 0xc0) || ((data & 0x0f) > 9) ||
- (data >= 0x32))
- goto exit_free;
-
- /* Check for a valid month register value */
- if ((ds1337_read(new_client, DS1337_REG_MONTH, &data) < 0) ||
- (data == 0) || (data & 0x60) || ((data & 0x0f) > 9) ||
- ((data >= 0x13) && (data <= 0x19)))
- goto exit_free;
-
- /* Check that control register bits 6-5 are zero */
- if ((ds1337_read(new_client, DS1337_REG_CONTROL, &data) < 0) ||
- (data & 0x60))
- goto exit_free;
-
- kind = ds1337;
- }
-
- if (kind == ds1337)
- name = "ds1337";
-
- /* We can fill in the remaining client fields */
- strlcpy(new_client->name, name, I2C_NAME_SIZE);
-
- /* Tell the I2C layer a new client has arrived */
- if ((err = i2c_attach_client(new_client)))
- goto exit_free;
-
- /* Initialize the DS1337 chip */
- ds1337_init_client(new_client);
-
- /* Add client to local list */
- list_add(&data->list, &ds1337_clients);
-
- return 0;
-
-exit_free:
- kfree(data);
-exit:
- return err;
-}
-
-static void ds1337_init_client(struct i2c_client *client)
-{
- u8 status, control;
-
- /* On some boards, the RTC isn't configured by boot firmware.
- * Handle that case by starting/configuring the RTC now.
- */
- status = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS);
- control = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL);
-
- if ((status & 0x80) || (control & 0x80)) {
- /* RTC not running */
- u8 buf[1+16]; /* First byte is interpreted as address */
- struct i2c_msg msg[1];
-
- dev_dbg(&client->dev, "%s: RTC not running!\n", __FUNCTION__);
-
- /* Initialize all, including STATUS and CONTROL to zero */
- memset(buf, 0, sizeof(buf));
-
- /* Write valid values in the date/time registers */
- buf[1+DS1337_REG_DAY] = 1;
- buf[1+DS1337_REG_DATE] = 1;
- buf[1+DS1337_REG_MONTH] = 1;
-
- msg[0].addr = client->addr;
- msg[0].flags = 0;
- msg[0].len = sizeof(buf);
- msg[0].buf = &buf[0];
-
- i2c_transfer(client->adapter, msg, 1);
- } else {
- /* Running: ensure that device is set in 24-hour mode */
- s32 val;
-
- val = i2c_smbus_read_byte_data(client, DS1337_REG_HOUR);
- if ((val >= 0) && (val & (1 << 6)))
- i2c_smbus_write_byte_data(client, DS1337_REG_HOUR,
- val & 0x3f);
- }
-}
-
-static int ds1337_detach_client(struct i2c_client *client)
-{
- int err;
- struct ds1337_data *data = i2c_get_clientdata(client);
-
- if ((err = i2c_detach_client(client)))
- return err;
-
- list_del(&data->list);
- kfree(data);
- return 0;
-}
-
-static int __init ds1337_init(void)
-{
- return i2c_add_driver(&ds1337_driver);
-}
-
-static void __exit ds1337_exit(void)
-{
- i2c_del_driver(&ds1337_driver);
-}
-
-MODULE_AUTHOR("James Chapman <jchapman@katalix.com>");
-MODULE_DESCRIPTION("DS1337 RTC driver");
-MODULE_LICENSE("GPL");
-
-EXPORT_SYMBOL_GPL(ds1337_do_command);
-
-module_init(ds1337_init);
-module_exit(ds1337_exit);
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