Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 402 insertions, 0 deletions

diff --git a/drivers/i2c/chips/ds1337.c b/drivers/i2c/chips/ds1337.c
new file mode 100644
index 000000000000..07f16c3fb084
--- /dev/null
+++ b/drivers/i2c/chips/ds1337.c
@@ -0,0 +1,402 @@
+/*
+ *  linux/drivers/i2c/chips/ds1337.c
+ *
+ *  Copyright (C) 2005 James Chapman <jchapman@katalix.com>
+ *
+ *      based on linux/drivers/acron/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 real time clock chip
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/i2c-sensor.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 };
+static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
+
+SENSORS_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 = {
+        .owner          = THIS_MODULE,
+        .name           = "ds1337",
+        .flags          = I2C_DF_NOTIFY,
+        .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;
+        int id;
+};
+
+/*
+ * Internal variables
+ */
+static int ds1337_id;
+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)
+{
+        struct ds1337_data *data = i2c_get_clientdata(client);
+        int result;
+        u8 buf[7];
+        u8 val;
+        struct i2c_msg msg[2];
+        u8 offs = 0;
+
+        if (!dt) {
+                dev_dbg(&client->adapter->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 = client->adapter->algo->master_xfer(client->adapter,
+                                                    &msg[0], 2);
+
+        dev_dbg(&client->adapter->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 >= 0) {
+                dt->tm_sec = BCD_TO_BIN(buf[0]);
+                dt->tm_min = BCD_TO_BIN(buf[1]);
+                val = buf[2] & 0x3f;
+                dt->tm_hour = BCD_TO_BIN(val);
+                dt->tm_wday = BCD_TO_BIN(buf[3]) - 1;
+                dt->tm_mday = BCD_TO_BIN(buf[4]);
+                val = buf[5] & 0x7f;
+                dt->tm_mon = BCD_TO_BIN(val);
+                dt->tm_year = 1900 + BCD_TO_BIN(buf[6]);
+                if (buf[5] & 0x80)
+                        dt->tm_year += 100;
+
+                dev_dbg(&client->adapter->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);
+        } else {
+                dev_err(&client->adapter->dev, "ds1337[%d]: error reading "
+                        "data! %d\n", data->id, result);
+                result = -EIO;
+        }
+
+        return result;
+}
+
+static int ds1337_set_datetime(struct i2c_client *client, struct rtc_time *dt)
+{
+        struct ds1337_data *data = i2c_get_clientdata(client);
+        int result;
+        u8 buf[8];
+        u8 val;
+        struct i2c_msg msg[1];
+
+        if (!dt) {
+                dev_dbg(&client->adapter->dev, "%s: EINVAL: dt=NULL\n",
+                        __FUNCTION__);
+
+                return -EINVAL;
+        }
+
+        dev_dbg(&client->adapter->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] = BIN_TO_BCD(dt->tm_sec);
+        buf[2] = BIN_TO_BCD(dt->tm_min);
+        buf[3] = BIN_TO_BCD(dt->tm_hour) | (1 << 6);
+        buf[4] = BIN_TO_BCD(dt->tm_wday) + 1;
+        buf[5] = BIN_TO_BCD(dt->tm_mday);
+        buf[6] = BIN_TO_BCD(dt->tm_mon);
+        if (dt->tm_year >= 2000) {
+                val = dt->tm_year - 2000;
+                buf[6] |= (1 << 7);
+        } else {
+                val = dt->tm_year - 1900;
+        }
+        buf[7] = BIN_TO_BCD(val);
+
+        msg[0].addr = client->addr;
+        msg[0].flags = 0;
+        msg[0].len = sizeof(buf);
+        msg[0].buf = &buf[0];
+
+        result = client->adapter->algo->master_xfer(client->adapter,
+                                                    &msg[0], 1);
+        if (result < 0) {
+                dev_err(&client->adapter->dev, "ds1337[%d]: error "
+                        "writing data! %d\n", data->id, result);
+                result = -EIO;
+        } else {
+                result = 0;
+        }
+
+        return result;
+}
+
+static int ds1337_command(struct i2c_client *client, unsigned int cmd,
+                          void *arg)
+{
+        dev_dbg(&client->adapter->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 id, 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->id == id)
+                        return ds1337_command(&data->client, cmd, arg);
+        }
+
+        return -ENODEV;
+}
+
+static int ds1337_attach_adapter(struct i2c_adapter *adapter)
+{
+        return i2c_detect(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 = kmalloc(sizeof(struct ds1337_data), GFP_KERNEL))) {
+                err = -ENOMEM;
+                goto exit;
+        }
+        memset(data, 0, sizeof(struct ds1337_data));
+        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 */
+        data->id = ds1337_id++;
+        list_add(&data->list, &ds1337_clients);
+
+        return 0;
+
+exit_free:
+        kfree(data);
+exit:
+        return err;
+}
+
+static void ds1337_init_client(struct i2c_client *client)
+{
+        s32 val;
+
+        /* Ensure that device is set in 24-hour mode */
+        val = i2c_smbus_read_byte_data(client, DS1337_REG_HOUR);
+        if ((val >= 0) && (val & (1 << 6)) == 0)
+                i2c_smbus_write_byte_data(client, DS1337_REG_HOUR,
+                                          val | (1 << 6));
+}
+
+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))) {
+                dev_err(&client->dev, "Client deregistration failed, "
+                        "client not detached.\n");
+                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");
+
+module_init(ds1337_init);
+module_exit(ds1337_exit);