Linux-2.6.12-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!
diff --git a/drivers/acorn/char/pcf8583.c b/drivers/acorn/char/pcf8583.c
new file mode 100644
index 0000000..ad7ae7a
--- /dev/null
+++ b/drivers/acorn/char/pcf8583.c
@@ -0,0 +1,239 @@
+/*
+ * 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 PCF8583 RTC & RAM chip
+ */
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/mc146818rtc.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/bcd.h>
+
+#include "pcf8583.h"
+
+static struct i2c_driver pcf8583_driver;
+
+static unsigned short ignore[] = { I2C_CLIENT_END };
+static unsigned short normal_addr[] = { 0x50, 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,
+};
+
+#define DAT(x) ((unsigned int)(x->dev.driver_data))
+
+static int
+pcf8583_attach(struct i2c_adapter *adap, int addr, int kind)
+{
+ struct i2c_client *c;
+ unsigned char buf[1], ad[1] = { 0 };
+ struct i2c_msg msgs[2] = {
+ { addr, 0, 1, ad },
+ { addr, I2C_M_RD, 1, buf }
+ };
+
+ c = kmalloc(sizeof(*c), GFP_KERNEL);
+ if (!c)
+ return -ENOMEM;
+
+ memset(c, 0, sizeof(*c));
+ c->addr = addr;
+ c->adapter = adap;
+ c->driver = &pcf8583_driver;
+
+ if (i2c_transfer(c->adapter, msgs, 2) == 2)
+ DAT(c) = buf[0];
+
+ return i2c_attach_client(c);
+}
+
+static int
+pcf8583_probe(struct i2c_adapter *adap)
+{
+ return i2c_probe(adap, &addr_data, pcf8583_attach);
+}
+
+static int
+pcf8583_detach(struct i2c_client *client)
+{
+ i2c_detach_client(client);
+ kfree(client);
+ return 0;
+}
+
+static int
+pcf8583_get_datetime(struct i2c_client *client, struct rtc_tm *dt)
+{
+ unsigned char buf[8], addr[1] = { 1 };
+ struct i2c_msg msgs[2] = {
+ { client->addr, 0, 1, addr },
+ { client->addr, I2C_M_RD, 6, buf }
+ };
+ int ret = -EIO;
+
+ memset(buf, 0, sizeof(buf));
+
+ ret = i2c_transfer(client->adapter, msgs, 2);
+ if (ret == 2) {
+ dt->year_off = buf[4] >> 6;
+ dt->wday = buf[5] >> 5;
+
+ buf[4] &= 0x3f;
+ buf[5] &= 0x1f;
+
+ dt->cs = BCD_TO_BIN(buf[0]);
+ dt->secs = BCD_TO_BIN(buf[1]);
+ dt->mins = BCD_TO_BIN(buf[2]);
+ dt->hours = BCD_TO_BIN(buf[3]);
+ dt->mday = BCD_TO_BIN(buf[4]);
+ dt->mon = BCD_TO_BIN(buf[5]);
+
+ ret = 0;
+ }
+
+ return ret;
+}
+
+static int
+pcf8583_set_datetime(struct i2c_client *client, struct rtc_tm *dt, int datetoo)
+{
+ unsigned char buf[8];
+ int ret, len = 6;
+
+ buf[0] = 0;
+ buf[1] = DAT(client) | 0x80;
+ buf[2] = BIN_TO_BCD(dt->cs);
+ buf[3] = BIN_TO_BCD(dt->secs);
+ buf[4] = BIN_TO_BCD(dt->mins);
+ buf[5] = BIN_TO_BCD(dt->hours);
+
+ if (datetoo) {
+ len = 8;
+ buf[6] = BIN_TO_BCD(dt->mday) | (dt->year_off << 6);
+ buf[7] = BIN_TO_BCD(dt->mon) | (dt->wday << 5);
+ }
+
+ ret = i2c_master_send(client, (char *)buf, len);
+ if (ret == len)
+ ret = 0;
+
+ buf[1] = DAT(client);
+ i2c_master_send(client, (char *)buf, 2);
+
+ return ret;
+}
+
+static int
+pcf8583_get_ctrl(struct i2c_client *client, unsigned char *ctrl)
+{
+ *ctrl = DAT(client);
+ return 0;
+}
+
+static int
+pcf8583_set_ctrl(struct i2c_client *client, unsigned char *ctrl)
+{
+ unsigned char buf[2];
+
+ buf[0] = 0;
+ buf[1] = *ctrl;
+ DAT(client) = *ctrl;
+
+ return i2c_master_send(client, (char *)buf, 2);
+}
+
+static int
+pcf8583_read_mem(struct i2c_client *client, struct mem *mem)
+{
+ unsigned char addr[1];
+ struct i2c_msg msgs[2] = {
+ { client->addr, 0, 1, addr },
+ { client->addr, I2C_M_RD, 0, mem->data }
+ };
+
+ if (mem->loc < 8)
+ return -EINVAL;
+
+ addr[0] = mem->loc;
+ msgs[1].len = mem->nr;
+
+ return i2c_transfer(client->adapter, msgs, 2) == 2 ? 0 : -EIO;
+}
+
+static int
+pcf8583_write_mem(struct i2c_client *client, struct mem *mem)
+{
+ unsigned char addr[1];
+ struct i2c_msg msgs[2] = {
+ { client->addr, 0, 1, addr },
+ { client->addr, 0, 0, mem->data }
+ };
+
+ if (mem->loc < 8)
+ return -EINVAL;
+
+ addr[0] = mem->loc;
+ msgs[1].len = mem->nr;
+
+ return i2c_transfer(client->adapter, msgs, 2) == 2 ? 0 : -EIO;
+}
+
+static int
+pcf8583_command(struct i2c_client *client, unsigned int cmd, void *arg)
+{
+ switch (cmd) {
+ case RTC_GETDATETIME:
+ return pcf8583_get_datetime(client, arg);
+
+ case RTC_SETTIME:
+ return pcf8583_set_datetime(client, arg, 0);
+
+ case RTC_SETDATETIME:
+ return pcf8583_set_datetime(client, arg, 1);
+
+ case RTC_GETCTRL:
+ return pcf8583_get_ctrl(client, arg);
+
+ case RTC_SETCTRL:
+ return pcf8583_set_ctrl(client, arg);
+
+ case MEM_READ:
+ return pcf8583_read_mem(client, arg);
+
+ case MEM_WRITE:
+ return pcf8583_write_mem(client, arg);
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static struct i2c_driver pcf8583_driver = {
+ .name = "PCF8583",
+ .id = I2C_DRIVERID_PCF8583,
+ .flags = I2C_DF_NOTIFY,
+ .attach_adapter = pcf8583_probe,
+ .detach_client = pcf8583_detach,
+ .command = pcf8583_command
+};
+
+static __init int pcf8583_init(void)
+{
+ return i2c_add_driver(&pcf8583_driver);
+}
+
+__initcall(pcf8583_init);