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/* * Ani2c driver for the Xicor/Intersil X1205 RTC *Copyright 2004 Karen Spearel *Copyright 2005 Alessandro Zummo * *please send all reports to: * Karen Spearel <kas111 at gmail dot com> * *based on a lot of other RTC drivers. * *This program is free software; you can redistribute it and/or modify * itunder the terms of the GNU General Public License version 2 as *published by the Free Software Foundation. */ #include <linux/module.h> #include <linux/i2c.h> #include <linux/bcd.h> #include <linux/rtc.h> #include <linux/delay.h> #define DRV_VERSION "1.0.7" /* Addresses to scan: none. This chip islocated at *0x6f and uses a two bytes register addressing. *Two bytes need to be written to read a single register, *while most other chips just require one and take the second *one as the data to be written. To prevent corrupting *unknown chips, the user must explicitely set the probe parameter. */ static struct i2c_driver x1205_driver; static unsigned short normal_i2c[] = {0x6f, I2C_CLIENT_END}; //zbs tianjia 0x6f; static unsigned short force_addr[] ={ANY_I2C_BUS, 0x6f, I2C_CLIENT_END}; //zbs //static unsigned short *force[] = {force_addr,NULL}; //zbs //static unsigned short ignore[] = { I2C_CLIENT_END }; //zbs /* static struct i2c_client_address_data addr_data = { .normal_i2c =normal_i2c, .probe = ignore, .ignore = ignore, //.forces = forces, }; //zbs */ /* Insmod parameters */ I2C_CLIENT_INSMOD; /* offsets into CCR area */ #define CCR_SEC 0 #define CCR_MIN 1 #define CCR_HOUR 2 #define CCR_MDAY 3 #define CCR_MONTH 4 #define CCR_YEAR 5 #define CCR_WDAY 6 #define CCR_Y2K 7 #define X1205_REG_SR 0x3F /* status register*/ #define X1205_REG_Y2K 0x37 #define X1205_REG_DW 0x36 #define X1205_REG_YR 0x35 #define X1205_REG_MO 0x34 #define X1205_REG_DT 0x33 #define X1205_REG_HR 0x32 #define X1205_REG_MN 0x31 #define X1205_REG_SC 0x30 #define X1205_REG_DTR 0x13 #define X1205_REG_ATR 0x12 #define X1205_REG_INT 0x11 #define X1205_REG_0 0x10 #define X1205_REG_Y2K1 0x0F #define X1205_REG_DWA1 0x0E #define X1205_REG_YRA1 0x0D #define X1205_REG_MOA1 0x0C #define X1205_REG_DTA1 0x0B #define X1205_REG_HRA1 0x0A #define X1205_REG_MNA1 0x09 #define X1205_REG_SCA1 0x08 #define X1205_REG_Y2K0 0x07 #define X1205_REG_DWA0 0x06 #define X1205_REG_YRA0 0x05 #define X1205_REG_MOA0 0x04 #define X1205_REG_DTA0 0x03 #define X1205_REG_HRA0 0x02 #define X1205_REG_MNA0 0x01 #define X1205_REG_SCA0 0x00 #define X1205_CCR_BASE 0x30 /*Base address of CCR */ #define X1205_ALM0_BASE 0x00 /*Base address of ALARM0 */ #define X1205_SR_RTCF 0x01 /* Clock failure */ #define X1205_SR_WEL 0x02 /*Write Enable Latch */ #define X1205_SR_RWEL 0x04 /*Register Write Enable */ #define X1205_DTR_DTR0 0x01 #define X1205_DTR_DTR1 0x02 #define X1205_DTR_DTR2 0x04 #define X1205_HR_MIL 0x80 /* Set inccr.hour for 24 hr mode */ /* Prototypes */ static int x1205_attach(struct i2c_adapter*adapter); static int x1205_detach(struct i2c_client*client); static int x1205_probe(struct i2c_adapter*adapter, int address, int kind); static struct i2c_driver x1205_driver = { .driver = { .name = "x1205", }, .id = I2C_DRIVERID_X1205, .attach_adapter= &x1205_attach, .detach_client = &x1205_detach, }; /* * Inthe routines that deal directly with the x1205 hardware, we use *rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch *Epoch is initialized as 2000. Time is set to UTC. */ static int x1205_get_datetime(structi2c_client *client, struct rtc_time *tm, unsignedchar reg_base) { unsignedchar dt_addr[2] = { 0, reg_base }; unsignedchar buf[8]; structi2c_msg msgs[] = { {client->addr, 0, 2, dt_addr }, /*setup read ptr */ {client->addr, I2C_M_RD, 8, buf }, /*read date */ }; /*read date registers */ if((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) { dev_err(&client->dev,"%s: read error\n", __FUNCTION__); return-EIO; } dev_dbg(&client->dev, "%s:raw read data - sec=%02x, min=%02x, hr=%02x, " "mday=%02x,mon=%02x, year=%02x, wday=%02x, y2k=%02x\n", __FUNCTION__, buf[0],buf[1], buf[2], buf[3], buf[4],buf[5], buf[6], buf[7]); tm->tm_sec= BCD2BIN(buf[CCR_SEC]); tm->tm_min= BCD2BIN(buf[CCR_MIN]); tm->tm_hour= BCD2BIN(buf[CCR_HOUR] & 0x3F); /* hr is 0-23 */ tm->tm_mday= BCD2BIN(buf[CCR_MDAY]); tm->tm_mon= BCD2BIN(buf[CCR_MONTH]) - 1; /* mon is 0-11 */ tm->tm_year= BCD2BIN(buf[CCR_YEAR]) +(BCD2BIN(buf[CCR_Y2K]) * 100) - 1900; tm->tm_wday= buf[CCR_WDAY]; dev_dbg(&client->dev,"%s: tm is secs=%d, mins=%d, hours=%d, " "mday=%d,mon=%d, year=%d, wday=%d\n", __FUNCTION__, tm->tm_sec,tm->tm_min, tm->tm_hour, tm->tm_mday,tm->tm_mon, tm->tm_year, tm->tm_wday); return0; } static int x1205_get_status(structi2c_client *client, unsigned char *sr) { staticunsigned char sr_addr[2] = { 0, X1205_REG_SR }; structi2c_msg msgs[] = { {client->addr, 0, 2, sr_addr }, /*setup read ptr */ {client->addr, I2C_M_RD, 1, sr }, /*read status */ }; /*read status register */ if((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) { dev_err(&client->dev,"%s: read error\n", __FUNCTION__); return-EIO; } return0; } static int x1205_set_datetime(structi2c_client *client, struct rtc_time *tm, intdatetoo, u8 reg_base) { inti, xfer; unsignedchar buf[8]; staticconst unsigned char wel[3] = { 0, X1205_REG_SR, X1205_SR_WEL}; staticconst unsigned char rwel[3] = { 0, X1205_REG_SR, X1205_SR_WEL| X1205_SR_RWEL }; staticconst unsigned char diswe[3] = { 0, X1205_REG_SR, 0 }; dev_dbg(&client->dev, "%s:secs=%d, mins=%d, hours=%d\n", __FUNCTION__, tm->tm_sec,tm->tm_min, tm->tm_hour); buf[CCR_SEC]= BIN2BCD(tm->tm_sec); buf[CCR_MIN]= BIN2BCD(tm->tm_min); /*set hour and 24hr bit */ buf[CCR_HOUR]= BIN2BCD(tm->tm_hour) | X1205_HR_MIL; /*should we also set the date? */ if(datetoo) { dev_dbg(&client->dev, "%s:mday=%d, mon=%d, year=%d, wday=%d\n", __FUNCTION__, tm->tm_mday,tm->tm_mon, tm->tm_year, tm->tm_wday); buf[CCR_MDAY]= BIN2BCD(tm->tm_mday); /*month, 1 - 12 */ buf[CCR_MONTH]= BIN2BCD(tm->tm_mon + 1); /*year, since the rtc epoch*/ buf[CCR_YEAR]= BIN2BCD(tm->tm_year % 100); buf[CCR_WDAY]= tm->tm_wday & 0x07; buf[CCR_Y2K]= BIN2BCD(tm->tm_year / 100); } /*this sequence is required to unlock the chip */ if((xfer = i2c_master_send(client, wel, 3)) != 3) { dev_err(&client->dev,"%s: wel - %d\n", __FUNCTION__, xfer); return-EIO; } if((xfer = i2c_master_send(client, rwel, 3)) != 3) { dev_err(&client->dev,"%s: rwel - %d\n", __FUNCTION__, xfer); return-EIO; } /*write register's data */ for(i = 0; i < (datetoo ? 8 : 3); i++) { unsignedchar rdata[3] = { 0, reg_base + i, buf }; xfer= i2c_master_send(client, rdata, 3); if(xfer != 3) { dev_err(&client->dev, "%s:xfer=%d addr=%02x, data=%02x\n", __FUNCTION__, xfer, rdata[1], rdata[2]); return-EIO; } }; /*disable further writes */ if((xfer = i2c_master_send(client, diswe, 3)) != 3) { dev_err(&client->dev,"%s: diswe - %d\n", __FUNCTION__, xfer); return-EIO; } return0; } static int x1205_fix_osc(struct i2c_client*client) { interr; structrtc_time tm; tm.tm_hour= tm.tm_min = tm.tm_sec = 0; if((err = x1205_set_datetime(client, &tm, 0, X1205_CCR_BASE)) < 0) dev_err(&client->dev, "unableto restart the oscillator\n"); returnerr; } static int x1205_get_dtrim(structi2c_client *client, int *trim) { unsignedchar dtr; staticunsigned char dtr_addr[2] = { 0, X1205_REG_DTR }; structi2c_msg msgs[] = { {client->addr, 0, 2, dtr_addr }, /*setup read ptr */ {client->addr, I2C_M_RD, 1, &dtr }, /*read dtr */ }; /*read dtr register */ if((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) { dev_err(&client->dev,"%s: read error\n", __FUNCTION__); return-EIO; } dev_dbg(&client->dev,"%s: raw dtr=%x\n", __FUNCTION__, dtr); *trim= 0; if(dtr & X1205_DTR_DTR0) *trim+= 20; if(dtr & X1205_DTR_DTR1) *trim+= 10; if(dtr & X1205_DTR_DTR2) *trim= -*trim; return0; } static int x1205_get_atrim(structi2c_client *client, int *trim) { s8atr; staticunsigned char atr_addr[2] = { 0, X1205_REG_ATR }; structi2c_msg msgs[] = { {client->addr, 0, 2, atr_addr }, /*setup read ptr */ {client->addr, I2C_M_RD, 1, &atr }, /*read atr */ }; /*read atr register */ if((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) { dev_err(&client->dev,"%s: read error\n", __FUNCTION__); return-EIO; } dev_dbg(&client->dev,"%s: raw atr=%x\n", __FUNCTION__, atr); /*atr is a two's complement value on 6 bits, * perform sign extension. The formula is * Catr = (atr * 0.25pF) + 11.00pF. */ if(atr & 0x20) atr|= 0xC0; dev_dbg(&client->dev,"%s: raw atr=%x (%d)\n", __FUNCTION__, atr, atr); *trim= (atr * 250) + 11000; dev_dbg(&client->dev,"%s: real=%d\n", __FUNCTION__, *trim); return0; } struct x1205_limit { unsignedchar reg, mask, min, max; }; static int x1205_validate_client(structi2c_client *client) { inti, xfer; /*Probe array. We will read the register at the specified * address and check if the given bits arezero. */ staticconst unsigned char probe_zero_pattern[] = { /*register, mask */ X1205_REG_SR, 0x18, X1205_REG_DTR, 0xF8, X1205_REG_ATR, 0xC0, X1205_REG_INT, 0x18, X1205_REG_0, 0xFF, }; staticconst struct x1205_limit probe_limits_pattern[] = { /*register, mask, min, max */ {X1205_REG_Y2K, 0xFF, 19, 20 }, {X1205_REG_DW, 0xFF, 0, 6 }, {X1205_REG_YR, 0xFF, 0, 99 }, {X1205_REG_MO, 0xFF, 0, 12 }, {X1205_REG_DT, 0xFF, 0, 31 }, {X1205_REG_HR, 0x7F, 0, 23 }, {X1205_REG_MN, 0xFF, 0, 59 }, {X1205_REG_SC, 0xFF, 0, 59 }, {X1205_REG_Y2K1, 0xFF, 19, 20 }, {X1205_REG_Y2K0, 0xFF, 19, 20 }, }; /*check that registers have bits a 0 where expected */ for(i = 0; i < ARRAY_SIZE(probe_zero_pattern); i += 2) { unsignedchar buf; unsignedchar addr[2] = { 0, probe_zero_pattern }; structi2c_msg msgs[2] = { {client->addr, 0, 2, addr }, {client->addr, I2C_M_RD, 1, &buf }, }; if((xfer = i2c_transfer(client->adapter, msgs, 2)) != 2) { dev_err(&client->adapter->dev, "%s:could not read register %x\n", __FUNCTION__,probe_zero_pattern); return-EIO; } if((buf & probe_zero_pattern[i+1]) != 0) { dev_err(&client->adapter->dev, "%s:register=%02x, zero pattern=%d, value=%x\n", __FUNCTION__,probe_zero_pattern, i, buf); return-ENODEV; } } /*check limits (only registers with bcd values) */ for(i = 0; i < ARRAY_SIZE(probe_limits_pattern); i++) { unsignedchar reg, value; unsignedchar addr[2] = { 0, probe_limits_pattern.reg }; structi2c_msg msgs[2] = { {client->addr, 0, 2, addr }, {client->addr, I2C_M_RD, 1, ® }, }; if((xfer = i2c_transfer(client->adapter, msgs, 2)) != 2) { dev_err(&client->adapter->dev, "%s:could not read register %x\n", __FUNCTION__,probe_limits_pattern.reg); return-EIO; } value= BCD2BIN(reg & probe_limits_pattern.mask); if(value > probe_limits_pattern.max || value< probe_limits_pattern.min) { dev_dbg(&client->adapter->dev, "%s:register=%x, lim pattern=%d, value=%d\n", __FUNCTION__,probe_limits_pattern.reg, i,value); return-ENODEV; } } return0; } static int x1205_rtc_read_alarm(structdevice *dev, struct rtc_wkalrm *alrm) { returnx1205_get_datetime(to_i2c_client(dev), &alrm->time,X1205_ALM0_BASE); } static int x1205_rtc_set_alarm(structdevice *dev, struct rtc_wkalrm *alrm) { returnx1205_set_datetime(to_i2c_client(dev), &alrm->time,1, X1205_ALM0_BASE); } static int x1205_rtc_read_time(structdevice *dev, struct rtc_time *tm) { returnx1205_get_datetime(to_i2c_client(dev), tm,X1205_CCR_BASE); } static int x1205_rtc_set_time(struct device*dev, struct rtc_time *tm) { returnx1205_set_datetime(to_i2c_client(dev), tm,1, X1205_CCR_BASE); } static int x1205_rtc_proc(struct device*dev, struct seq_file *seq) { interr, dtrim, atrim; if((err = x1205_get_dtrim(to_i2c_client(dev), &dtrim)) == 0) seq_printf(seq,"digital_trim\t: %d ppm\n", dtrim); if((err = x1205_get_atrim(to_i2c_client(dev), &atrim)) == 0) seq_printf(seq,"analog_trim\t: %d.%02d pF\n", atrim/ 1000, atrim % 1000); return0; } static struct rtc_class_ops x1205_rtc_ops ={ .proc = x1205_rtc_proc, .read_time = x1205_rtc_read_time, .set_time = x1205_rtc_set_time, .read_alarm = x1205_rtc_read_alarm, .set_alarm = x1205_rtc_set_alarm, }; static ssize_t x1205_sysfs_show_atrim(structdevice *dev, structdevice_attribute *attr, char *buf) { interr, atrim; err= x1205_get_atrim(to_i2c_client(dev), &atrim); if(err) returnerr; returnsprintf(buf, "%d.%02d pF\n", atrim / 1000, atrim % 1000); } static DEVICE_ATTR(atrim, S_IRUGO,x1205_sysfs_show_atrim, NULL); static ssize_tx1205_sysfs_show_dtrim(struct device *dev, structdevice_attribute *attr, char *buf) { interr, dtrim; err= x1205_get_dtrim(to_i2c_client(dev), &dtrim); if(err) returnerr; returnsprintf(buf, "%d ppm\n", dtrim); } static DEVICE_ATTR(dtrim, S_IRUGO,x1205_sysfs_show_dtrim, NULL); static int x1205_attach(struct i2c_adapter*adapter) { returni2c_probe(adapter, &addr_data, x1205_probe); } static int x1205_probe(struct i2c_adapter*adapter, int address, int kind) { interr = 0; unsignedchar sr; structi2c_client *client; structrtc_device *rtc; dev_dbg(&adapter->dev,"%s\n", __FUNCTION__); if(!i2c_check_functionality(adapter, I2C_FUNC_I2C)) { err= -ENODEV; gotoexit; } if(!(client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL))) { err= -ENOMEM; gotoexit; } /*I2C client */ client->addr= address; client->driver= &x1205_driver; client->adapter = adapter; strlcpy(client->name,x1205_driver.driver.name, I2C_NAME_SIZE); /*Verify the chip is really an X1205 */ if(kind < 0) { if(x1205_validate_client(client) < 0) { err= -ENODEV; gotoexit_kfree; } } /*Inform the i2c layer */ if((err = i2c_attach_client(client))) gotoexit_kfree; dev_info(&client->dev,"chip found, driver version " DRV_VERSION "\n"); rtc= rtc_device_register(x1205_driver.driver.name, &client->dev, &x1205_rtc_ops,THIS_MODULE); if(IS_ERR(rtc)) { err= PTR_ERR(rtc); gotoexit_detach; } i2c_set_clientdata(client,rtc); /*Check for power failures and eventualy enable the osc */ if((err = x1205_get_status(client, &sr)) == 0) { if(sr & X1205_SR_RTCF) { dev_err(&client->dev, "powerfailure detected, " "pleaseset the clock\n"); udelay(50); x1205_fix_osc(client); } } else dev_err(&client->dev,"couldn't read status\n"); device_create_file(&client->dev,&dev_attr_atrim); device_create_file(&client->dev,&dev_attr_dtrim); return0; exit_detach: i2c_detach_client(client); exit_kfree: kfree(client); exit: returnerr; } static int x1205_detach(struct i2c_client*client) { interr; structrtc_device *rtc = i2c_get_clientdata(client); if (rtc) rtc_device_unregister(rtc); if((err = i2c_detach_client(client))) returnerr; kfree(client); return0; } static int __init x1205_init(void) { returni2c_add_driver(&x1205_driver); } static void __exit x1205_exit(void) { i2c_del_driver(&x1205_driver); } //MODULE_AUTHOR( // "KarenSpearel <kas111 at gmail dot com>, " //MODULE_DESCRIPTION("Xicor/IntersilX1205 RTC driver"); MODULE_LICENSE("GPL"); //MODULE_VERSION(DRV_VERSION); module_init(x1205_init); module_exit(x1205_exit);
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发表于 2020-9-27 23:59:06