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/*
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* linux/drivers/acorn/char/pcf8583.c
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*
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* Copyright (C) 2000 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Driver for PCF8583 RTC & RAM chip
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*/
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/mc146818rtc.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/bcd.h>
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#include "pcf8583.h"
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static struct i2c_driver pcf8583_driver;
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static unsigned short ignore[] = { I2C_CLIENT_END };
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static unsigned short normal_addr[] = { 0x50, I2C_CLIENT_END };
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static unsigned short *forces[] = { NULL };
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static struct i2c_client_address_data addr_data = {
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.normal_i2c = normal_addr,
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.probe = ignore,
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.ignore = ignore,
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.forces = forces,
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};
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#define DAT(x) ((unsigned int)(x->dev.driver_data))
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static int
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pcf8583_attach(struct i2c_adapter *adap, int addr, int kind)
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{
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struct i2c_client *c;
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unsigned char buf[1], ad[1] = { 0 };
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struct i2c_msg msgs[2] = {
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{ addr, 0, 1, ad },
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{ addr, I2C_M_RD, 1, buf }
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};
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c = kmalloc(sizeof(*c), GFP_KERNEL);
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if (!c)
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return -ENOMEM;
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memset(c, 0, sizeof(*c));
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c->addr = addr;
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c->adapter = adap;
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c->driver = &pcf8583_driver;
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if (i2c_transfer(c->adapter, msgs, 2) == 2)
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DAT(c) = buf[0];
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return i2c_attach_client(c);
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}
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static int
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pcf8583_probe(struct i2c_adapter *adap)
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{
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return i2c_probe(adap, &addr_data, pcf8583_attach);
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}
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static int
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pcf8583_detach(struct i2c_client *client)
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{
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i2c_detach_client(client);
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kfree(client);
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return 0;
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}
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static int
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pcf8583_get_datetime(struct i2c_client *client, struct rtc_tm *dt)
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{
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unsigned char buf[8], addr[1] = { 1 };
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struct i2c_msg msgs[2] = {
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{ client->addr, 0, 1, addr },
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{ client->addr, I2C_M_RD, 6, buf }
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};
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int ret = -EIO;
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memset(buf, 0, sizeof(buf));
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ret = i2c_transfer(client->adapter, msgs, 2);
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if (ret == 2) {
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dt->year_off = buf[4] >> 6;
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dt->wday = buf[5] >> 5;
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buf[4] &= 0x3f;
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buf[5] &= 0x1f;
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dt->cs = BCD_TO_BIN(buf[0]);
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dt->secs = BCD_TO_BIN(buf[1]);
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dt->mins = BCD_TO_BIN(buf[2]);
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dt->hours = BCD_TO_BIN(buf[3]);
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dt->mday = BCD_TO_BIN(buf[4]);
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dt->mon = BCD_TO_BIN(buf[5]);
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ret = 0;
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}
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return ret;
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}
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static int
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pcf8583_set_datetime(struct i2c_client *client, struct rtc_tm *dt, int datetoo)
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{
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unsigned char buf[8];
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int ret, len = 6;
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buf[0] = 0;
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buf[1] = DAT(client) | 0x80;
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buf[2] = BIN_TO_BCD(dt->cs);
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buf[3] = BIN_TO_BCD(dt->secs);
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buf[4] = BIN_TO_BCD(dt->mins);
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buf[5] = BIN_TO_BCD(dt->hours);
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if (datetoo) {
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len = 8;
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buf[6] = BIN_TO_BCD(dt->mday) | (dt->year_off << 6);
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buf[7] = BIN_TO_BCD(dt->mon) | (dt->wday << 5);
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}
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ret = i2c_master_send(client, (char *)buf, len);
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if (ret == len)
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ret = 0;
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buf[1] = DAT(client);
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i2c_master_send(client, (char *)buf, 2);
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return ret;
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}
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static int
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pcf8583_get_ctrl(struct i2c_client *client, unsigned char *ctrl)
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{
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*ctrl = DAT(client);
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return 0;
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}
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static int
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pcf8583_set_ctrl(struct i2c_client *client, unsigned char *ctrl)
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{
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unsigned char buf[2];
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buf[0] = 0;
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buf[1] = *ctrl;
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DAT(client) = *ctrl;
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return i2c_master_send(client, (char *)buf, 2);
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}
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static int
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pcf8583_read_mem(struct i2c_client *client, struct mem *mem)
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{
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unsigned char addr[1];
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struct i2c_msg msgs[2] = {
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{ client->addr, 0, 1, addr },
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{ client->addr, I2C_M_RD, 0, mem->data }
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};
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if (mem->loc < 8)
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return -EINVAL;
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addr[0] = mem->loc;
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msgs[1].len = mem->nr;
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return i2c_transfer(client->adapter, msgs, 2) == 2 ? 0 : -EIO;
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}
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static int
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pcf8583_write_mem(struct i2c_client *client, struct mem *mem)
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{
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unsigned char addr[1];
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struct i2c_msg msgs[2] = {
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{ client->addr, 0, 1, addr },
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{ client->addr, 0, 0, mem->data }
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};
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if (mem->loc < 8)
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return -EINVAL;
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addr[0] = mem->loc;
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msgs[1].len = mem->nr;
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return i2c_transfer(client->adapter, msgs, 2) == 2 ? 0 : -EIO;
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}
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static int
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pcf8583_command(struct i2c_client *client, unsigned int cmd, void *arg)
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{
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switch (cmd) {
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case RTC_GETDATETIME:
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return pcf8583_get_datetime(client, arg);
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case RTC_SETTIME:
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return pcf8583_set_datetime(client, arg, 0);
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case RTC_SETDATETIME:
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return pcf8583_set_datetime(client, arg, 1);
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case RTC_GETCTRL:
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return pcf8583_get_ctrl(client, arg);
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case RTC_SETCTRL:
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return pcf8583_set_ctrl(client, arg);
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case MEM_READ:
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return pcf8583_read_mem(client, arg);
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case MEM_WRITE:
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return pcf8583_write_mem(client, arg);
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default:
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return -EINVAL;
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}
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}
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static struct i2c_driver pcf8583_driver = {
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.name = "PCF8583",
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.id = I2C_DRIVERID_PCF8583,
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.flags = I2C_DF_NOTIFY,
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.attach_adapter = pcf8583_probe,
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.detach_client = pcf8583_detach,
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.command = pcf8583_command
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};
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static __init int pcf8583_init(void)
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{
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return i2c_add_driver(&pcf8583_driver);
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}
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__initcall(pcf8583_init);
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