diff options
Diffstat (limited to 'drivers/i2c/chips/rtc8564.c')
| -rw-r--r-- | drivers/i2c/chips/rtc8564.c | 394 |
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 00000000000..5a9deddb626 --- /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); |