1 files changed, 394 insertions, 0 deletions

diff --git a/drivers/i2c/chips/rtc8564.c b/drivers/i2c/chips/rtc8564.c
new file mode 100644
index 000000000000..5a9deddb626b
--- /dev/null
+++ b/drivers/i2c/chips/rtc8564.c
@@ -0,0 +1,394 @@
+/*
+ *  linux/drivers/i2c/chips/rtc8564.c
+ *
+ *  Copyright (C) 2002-2004 Stefan Eletzhofer
+ *
+ *      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 system3's EPSON RTC 8564 chip
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/rtc.h>          /* get the user-level API */
+#include <linux/init.h>
+#include <linux/init.h>
+
+#include "rtc8564.h"
+
+#ifdef DEBUG
+# define _DBG(x, fmt, args...) do{ if (debug>=x) printk(KERN_DEBUG"%s: " fmt "\n", __FUNCTION__, ##args); } while(0);
+#else
+# define _DBG(x, fmt, args...) do { } while(0);
+#endif
+
+#define _DBGRTCTM(x, rtctm) if (debug>=x) printk("%s: secs=%d, mins=%d, hours=%d, mday=%d, " \
+                        "mon=%d, year=%d, wday=%d VL=%d\n", __FUNCTION__, \
+                        (rtctm).secs, (rtctm).mins, (rtctm).hours, (rtctm).mday, \
+                        (rtctm).mon, (rtctm).year, (rtctm).wday, (rtctm).vl);
+
+struct rtc8564_data {
+        struct i2c_client client;
+        u16 ctrl;
+};
+
+static inline u8 _rtc8564_ctrl1(struct i2c_client *client)
+{
+        struct rtc8564_data *data = i2c_get_clientdata(client);
+        return data->ctrl & 0xff;
+}
+static inline u8 _rtc8564_ctrl2(struct i2c_client *client)
+{
+        struct rtc8564_data *data = i2c_get_clientdata(client);
+        return (data->ctrl & 0xff00) >> 8;
+}
+
+#define CTRL1(c) _rtc8564_ctrl1(c)
+#define CTRL2(c) _rtc8564_ctrl2(c)
+
+#define BCD_TO_BIN(val) (((val)&15) + ((val)>>4)*10)
+#define BIN_TO_BCD(val) ((((val)/10)<<4) + (val)%10)
+
+static int debug;;
+module_param(debug, int, S_IRUGO | S_IWUSR);
+
+static struct i2c_driver rtc8564_driver;
+
+static unsigned short ignore[] = { I2C_CLIENT_END };
+static unsigned short normal_addr[] = { 0x51, I2C_CLIENT_END };
+
+static struct i2c_client_address_data addr_data = {
+        .normal_i2c             = normal_addr,
+        .normal_i2c_range       = ignore,
+        .probe                  = ignore,
+        .probe_range            = ignore,
+        .ignore                 = ignore,
+        .ignore_range           = ignore,
+        .force                  = ignore,
+};
+
+static int rtc8564_read_mem(struct i2c_client *client, struct mem *mem);
+static int rtc8564_write_mem(struct i2c_client *client, struct mem *mem);
+
+static int rtc8564_read(struct i2c_client *client, unsigned char adr,
+                        unsigned char *buf, unsigned char len)
+{
+        int ret = -EIO;
+        unsigned char addr[1] = { adr };
+        struct i2c_msg msgs[2] = {
+                {client->addr, 0, 1, addr},
+                {client->addr, I2C_M_RD, len, buf}
+        };
+
+        _DBG(1, "client=%p, adr=%d, buf=%p, len=%d", client, adr, buf, len);
+
+        if (!buf) {
+                ret = -EINVAL;
+                goto done;
+        }
+
+        ret = i2c_transfer(client->adapter, msgs, 2);
+        if (ret == 2) {
+                ret = 0;
+        }
+
+done:
+        return ret;
+}
+
+static int rtc8564_write(struct i2c_client *client, unsigned char adr,
+                         unsigned char *data, unsigned char len)
+{
+        int ret = 0;
+        unsigned char _data[16];
+        struct i2c_msg wr;
+        int i;
+
+        if (!data || len > 15) {
+                ret = -EINVAL;
+                goto done;
+        }
+
+        _DBG(1, "client=%p, adr=%d, buf=%p, len=%d", client, adr, data, len);
+
+        _data[0] = adr;
+        for (i = 0; i < len; i++) {
+                _data[i + 1] = data[i];
+                _DBG(5, "data[%d] = 0x%02x (%d)", i, data[i], data[i]);
+        }
+
+        wr.addr = client->addr;
+        wr.flags = 0;
+        wr.len = len + 1;
+        wr.buf = _data;
+
+        ret = i2c_transfer(client->adapter, &wr, 1);
+        if (ret == 1) {
+                ret = 0;
+        }
+
+done:
+        return ret;
+}
+
+static int rtc8564_attach(struct i2c_adapter *adap, int addr, int kind)
+{
+        int ret;
+        struct i2c_client *new_client;
+        struct rtc8564_data *d;
+        unsigned char data[10];
+        unsigned char ad[1] = { 0 };
+        struct i2c_msg ctrl_wr[1] = {
+                {addr, 0, 2, data}
+        };
+        struct i2c_msg ctrl_rd[2] = {
+                {addr, 0, 1, ad},
+                {addr, I2C_M_RD, 2, data}
+        };
+
+        d = kmalloc(sizeof(struct rtc8564_data), GFP_KERNEL);
+        if (!d) {
+                ret = -ENOMEM;
+                goto done;
+        }
+        memset(d, 0, sizeof(struct rtc8564_data));
+        new_client = &d->client;
+
+        strlcpy(new_client->name, "RTC8564", I2C_NAME_SIZE);
+        i2c_set_clientdata(new_client, d);
+        new_client->flags = I2C_CLIENT_ALLOW_USE | I2C_DF_NOTIFY;
+        new_client->addr = addr;
+        new_client->adapter = adap;
+        new_client->driver = &rtc8564_driver;
+
+        _DBG(1, "client=%p", new_client);
+
+        /* init ctrl1 reg */
+        data[0] = 0;
+        data[1] = 0;
+        ret = i2c_transfer(new_client->adapter, ctrl_wr, 1);
+        if (ret != 1) {
+                printk(KERN_INFO "rtc8564: cant init ctrl1\n");
+                ret = -ENODEV;
+                goto done;
+        }
+
+        /* read back ctrl1 and ctrl2 */
+        ret = i2c_transfer(new_client->adapter, ctrl_rd, 2);
+        if (ret != 2) {
+                printk(KERN_INFO "rtc8564: cant read ctrl\n");
+                ret = -ENODEV;
+                goto done;
+        }
+
+        d->ctrl = data[0] | (data[1] << 8);
+
+        _DBG(1, "RTC8564_REG_CTRL1=%02x, RTC8564_REG_CTRL2=%02x",
+             data[0], data[1]);
+
+        ret = i2c_attach_client(new_client);
+done:
+        if (ret) {
+                kfree(d);
+        }
+        return ret;
+}
+
+static int rtc8564_probe(struct i2c_adapter *adap)
+{
+        return i2c_probe(adap, &addr_data, rtc8564_attach);
+}
+
+static int rtc8564_detach(struct i2c_client *client)
+{
+        i2c_detach_client(client);
+        kfree(i2c_get_clientdata(client));
+        return 0;
+}
+
+static int rtc8564_get_datetime(struct i2c_client *client, struct rtc_tm *dt)
+{
+        int ret = -EIO;
+        unsigned char buf[15];
+
+        _DBG(1, "client=%p, dt=%p", client, dt);
+
+        if (!dt)
+                return -EINVAL;
+
+        memset(buf, 0, sizeof(buf));
+
+        ret = rtc8564_read(client, 0, buf, 15);
+        if (ret)
+                return ret;
+
+        /* century stored in minute alarm reg */
+        dt->year = BCD_TO_BIN(buf[RTC8564_REG_YEAR]);
+        dt->year += 100 * BCD_TO_BIN(buf[RTC8564_REG_AL_MIN] & 0x3f);
+        dt->mday = BCD_TO_BIN(buf[RTC8564_REG_DAY] & 0x3f);
+        dt->wday = BCD_TO_BIN(buf[RTC8564_REG_WDAY] & 7);
+        dt->mon = BCD_TO_BIN(buf[RTC8564_REG_MON_CENT] & 0x1f);
+
+        dt->secs = BCD_TO_BIN(buf[RTC8564_REG_SEC] & 0x7f);
+        dt->vl = (buf[RTC8564_REG_SEC] & 0x80) == 0x80;
+        dt->mins = BCD_TO_BIN(buf[RTC8564_REG_MIN] & 0x7f);
+        dt->hours = BCD_TO_BIN(buf[RTC8564_REG_HR] & 0x3f);
+
+        _DBGRTCTM(2, *dt);
+
+        return 0;
+}
+
+static int
+rtc8564_set_datetime(struct i2c_client *client, struct rtc_tm *dt, int datetoo)
+{
+        int ret, len = 5;
+        unsigned char buf[15];
+
+        _DBG(1, "client=%p, dt=%p", client, dt);
+
+        if (!dt)
+                return -EINVAL;
+
+        _DBGRTCTM(2, *dt);
+
+        buf[RTC8564_REG_CTRL1] = CTRL1(client) | RTC8564_CTRL1_STOP;
+        buf[RTC8564_REG_CTRL2] = CTRL2(client);
+        buf[RTC8564_REG_SEC] = BIN_TO_BCD(dt->secs);
+        buf[RTC8564_REG_MIN] = BIN_TO_BCD(dt->mins);
+        buf[RTC8564_REG_HR] = BIN_TO_BCD(dt->hours);
+
+        if (datetoo) {
+                len += 5;
+                buf[RTC8564_REG_DAY] = BIN_TO_BCD(dt->mday);
+                buf[RTC8564_REG_WDAY] = BIN_TO_BCD(dt->wday);
+                buf[RTC8564_REG_MON_CENT] = BIN_TO_BCD(dt->mon) & 0x1f;
+                /* century stored in minute alarm reg */
+                buf[RTC8564_REG_YEAR] = BIN_TO_BCD(dt->year % 100);
+                buf[RTC8564_REG_AL_MIN] = BIN_TO_BCD(dt->year / 100);
+        }
+
+        ret = rtc8564_write(client, 0, buf, len);
+        if (ret) {
+                _DBG(1, "error writing data! %d", ret);
+        }
+
+        buf[RTC8564_REG_CTRL1] = CTRL1(client);
+        ret = rtc8564_write(client, 0, buf, 1);
+        if (ret) {
+                _DBG(1, "error writing data! %d", ret);
+        }
+
+        return ret;
+}
+
+static int rtc8564_get_ctrl(struct i2c_client *client, unsigned int *ctrl)
+{
+        struct rtc8564_data *data = i2c_get_clientdata(client);
+
+        if (!ctrl)
+                return -1;
+
+        *ctrl = data->ctrl;
+        return 0;
+}
+
+static int rtc8564_set_ctrl(struct i2c_client *client, unsigned int *ctrl)
+{
+        struct rtc8564_data *data = i2c_get_clientdata(client);
+        unsigned char buf[2];
+
+        if (!ctrl)
+                return -1;
+
+        buf[0] = *ctrl & 0xff;
+        buf[1] = (*ctrl & 0xff00) >> 8;
+        data->ctrl = *ctrl;
+
+        return rtc8564_write(client, 0, buf, 2);
+}
+
+static int rtc8564_read_mem(struct i2c_client *client, struct mem *mem)
+{
+
+        if (!mem)
+                return -EINVAL;
+
+        return rtc8564_read(client, mem->loc, mem->data, mem->nr);
+}
+
+static int rtc8564_write_mem(struct i2c_client *client, struct mem *mem)
+{
+
+        if (!mem)
+                return -EINVAL;
+
+        return rtc8564_write(client, mem->loc, mem->data, mem->nr);
+}
+
+static int
+rtc8564_command(struct i2c_client *client, unsigned int cmd, void *arg)
+{
+
+        _DBG(1, "cmd=%d", cmd);
+
+        switch (cmd) {
+        case RTC_GETDATETIME:
+                return rtc8564_get_datetime(client, arg);
+
+        case RTC_SETTIME:
+                return rtc8564_set_datetime(client, arg, 0);
+
+        case RTC_SETDATETIME:
+                return rtc8564_set_datetime(client, arg, 1);
+
+        case RTC_GETCTRL:
+                return rtc8564_get_ctrl(client, arg);
+
+        case RTC_SETCTRL:
+                return rtc8564_set_ctrl(client, arg);
+
+        case MEM_READ:
+                return rtc8564_read_mem(client, arg);
+
+        case MEM_WRITE:
+                return rtc8564_write_mem(client, arg);
+
+        default:
+                return -EINVAL;
+        }
+}
+
+static struct i2c_driver rtc8564_driver = {
+        .owner          = THIS_MODULE,
+        .name           = "RTC8564",
+        .id             = I2C_DRIVERID_RTC8564,
+        .flags          = I2C_DF_NOTIFY,
+        .attach_adapter = rtc8564_probe,
+        .detach_client  = rtc8564_detach,
+        .command        = rtc8564_command
+};
+
+static __init int rtc8564_init(void)
+{
+        return i2c_add_driver(&rtc8564_driver);
+}
+
+static __exit void rtc8564_exit(void)
+{
+        i2c_del_driver(&rtc8564_driver);
+}
+
+MODULE_AUTHOR("Stefan Eletzhofer <Stefan.Eletzhofer@eletztrick.de>");
+MODULE_DESCRIPTION("EPSON RTC8564 Driver");
+MODULE_LICENSE("GPL");
+
+module_init(rtc8564_init);
+module_exit(rtc8564_exit);