patch-2.3.43 linux/drivers/acorn/char/pcf8583.c

• Lines: 233
• Date: Sun Feb 6 17:45:25 2000
• Orig file: v2.3.42/linux/drivers/acorn/char/pcf8583.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.42/linux/drivers/acorn/char/pcf8583.c linux/drivers/acorn/char/pcf8583.c
@@ -0,0 +1,232 @@
+/*
+ * linux/drivers/i2c/pcf8583.c
+ *
+ * Copyright (C) 2000 Russell King
+ *
+ * Driver for PCF8583 RTC & RAM chip
+ */
+
+#include <linux/i2c.h>
+#include <linux/malloc.h>
+#include <linux/string.h>
+#include <linux/mc146818rtc.h>
+#include <linux/init.h>
+
+#include "pcf8583.h"
+
+static struct i2c_driver pcf8583_driver;
+
+static unsigned short ignore[] = { I2C_CLIENT_END };
+static unsigned short normal_addr[] = { 0x50, 0x51, I2C_CLIENT_END };
+
+static struct i2c_client_address_data addr_data = {
+	force:			ignore,
+	ignore:			ignore,
+	ignore_range:		ignore,
+	normal_i2c:		ignore,
+	normal_i2c_range:	normal_addr,
+	probe:			ignore,
+	probe_range:		ignore
+};
+
+#define DAT(x) ((unsigned int)(x->data))
+
+static int
+pcf8583_attach(struct i2c_adapter *adap, int addr, unsigned short flags,
+	       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;
+
+	strcpy(c->name, "PCF8583");
+	c->id		= pcf8583_driver.id;
+	c->flags	= 0;
+	c->addr		= addr;
+	c->adapter	= adap;
+	c->driver	= &pcf8583_driver;
+	c->data		= NULL;
+
+	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);
+	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;
+
+	if (i2c_transfer(client->adapter, msgs, 2) == 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);
+
+	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 = {
+	"PCF8583",
+	I2C_DRIVERID_PCF8583,
+	I2C_DF_NOTIFY,
+	pcf8583_probe,
+	pcf8583_detach,
+	pcf8583_command
+};
+
+static __init int pcf8583_init(void)
+{
+	return i2c_add_driver(&pcf8583_driver);
+}
+
+__initcall(pcf8583_init);