| /* |
| * An I2C driver for Ricoh RS5C372, R2025S/D and RV5C38[67] RTCs |
| * |
| * Copyright (C) 2005 Pavel Mironchik <pmironchik@optifacio.net> |
| * Copyright (C) 2006 Tower Technologies |
| * Copyright (C) 2008 Paul Mundt |
| * |
| * 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. |
| */ |
| |
| #include <linux/i2c.h> |
| #include <linux/rtc.h> |
| #include <linux/bcd.h> |
| |
| #define DRV_VERSION "0.6" |
| |
| |
| /* |
| * Ricoh has a family of I2C based RTCs, which differ only slightly from |
| * each other. Differences center on pinout (e.g. how many interrupts, |
| * output clock, etc) and how the control registers are used. The '372 |
| * is significant only because that's the one this driver first supported. |
| */ |
| #define RS5C372_REG_SECS 0 |
| #define RS5C372_REG_MINS 1 |
| #define RS5C372_REG_HOURS 2 |
| #define RS5C372_REG_WDAY 3 |
| #define RS5C372_REG_DAY 4 |
| #define RS5C372_REG_MONTH 5 |
| #define RS5C372_REG_YEAR 6 |
| #define RS5C372_REG_TRIM 7 |
| # define RS5C372_TRIM_XSL 0x80 |
| # define RS5C372_TRIM_MASK 0x7F |
| |
| #define RS5C_REG_ALARM_A_MIN 8 /* or ALARM_W */ |
| #define RS5C_REG_ALARM_A_HOURS 9 |
| #define RS5C_REG_ALARM_A_WDAY 10 |
| |
| #define RS5C_REG_ALARM_B_MIN 11 /* or ALARM_D */ |
| #define RS5C_REG_ALARM_B_HOURS 12 |
| #define RS5C_REG_ALARM_B_WDAY 13 /* (ALARM_B only) */ |
| |
| #define RS5C_REG_CTRL1 14 |
| # define RS5C_CTRL1_AALE (1 << 7) /* or WALE */ |
| # define RS5C_CTRL1_BALE (1 << 6) /* or DALE */ |
| # define RV5C387_CTRL1_24 (1 << 5) |
| # define RS5C372A_CTRL1_SL1 (1 << 5) |
| # define RS5C_CTRL1_CT_MASK (7 << 0) |
| # define RS5C_CTRL1_CT0 (0 << 0) /* no periodic irq */ |
| # define RS5C_CTRL1_CT4 (4 << 0) /* 1 Hz level irq */ |
| #define RS5C_REG_CTRL2 15 |
| # define RS5C372_CTRL2_24 (1 << 5) |
| # define R2025_CTRL2_XST (1 << 5) |
| # define RS5C_CTRL2_XSTP (1 << 4) /* only if !R2025S/D */ |
| # define RS5C_CTRL2_CTFG (1 << 2) |
| # define RS5C_CTRL2_AAFG (1 << 1) /* or WAFG */ |
| # define RS5C_CTRL2_BAFG (1 << 0) /* or DAFG */ |
| |
| |
| /* to read (style 1) or write registers starting at R */ |
| #define RS5C_ADDR(R) (((R) << 4) | 0) |
| |
| |
| enum rtc_type { |
| rtc_undef = 0, |
| rtc_r2025sd, |
| rtc_rs5c372a, |
| rtc_rs5c372b, |
| rtc_rv5c386, |
| rtc_rv5c387a, |
| }; |
| |
| static const struct i2c_device_id rs5c372_id[] = { |
| { "r2025sd", rtc_r2025sd }, |
| { "rs5c372a", rtc_rs5c372a }, |
| { "rs5c372b", rtc_rs5c372b }, |
| { "rv5c386", rtc_rv5c386 }, |
| { "rv5c387a", rtc_rv5c387a }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, rs5c372_id); |
| |
| /* REVISIT: this assumes that: |
| * - we're in the 21st century, so it's safe to ignore the century |
| * bit for rv5c38[67] (REG_MONTH bit 7); |
| * - we should use ALARM_A not ALARM_B (may be wrong on some boards) |
| */ |
| struct rs5c372 { |
| struct i2c_client *client; |
| struct rtc_device *rtc; |
| enum rtc_type type; |
| unsigned time24:1; |
| unsigned has_irq:1; |
| unsigned smbus:1; |
| char buf[17]; |
| char *regs; |
| }; |
| |
| static int rs5c_get_regs(struct rs5c372 *rs5c) |
| { |
| struct i2c_client *client = rs5c->client; |
| struct i2c_msg msgs[] = { |
| { client->addr, I2C_M_RD, sizeof rs5c->buf, rs5c->buf }, |
| }; |
| |
| /* This implements the third reading method from the datasheet, using |
| * an internal address that's reset after each transaction (by STOP) |
| * to 0x0f ... so we read extra registers, and skip the first one. |
| * |
| * The first method doesn't work with the iop3xx adapter driver, on at |
| * least 80219 chips; this works around that bug. |
| * |
| * The third method on the other hand doesn't work for the SMBus-only |
| * configurations, so we use the the first method there, stripping off |
| * the extra register in the process. |
| */ |
| if (rs5c->smbus) { |
| int addr = RS5C_ADDR(RS5C372_REG_SECS); |
| int size = sizeof(rs5c->buf) - 1; |
| |
| if (i2c_smbus_read_i2c_block_data(client, addr, size, |
| rs5c->buf + 1) != size) { |
| dev_warn(&client->dev, "can't read registers\n"); |
| return -EIO; |
| } |
| } else { |
| if ((i2c_transfer(client->adapter, msgs, 1)) != 1) { |
| dev_warn(&client->dev, "can't read registers\n"); |
| return -EIO; |
| } |
| } |
| |
| dev_dbg(&client->dev, |
| "%02x %02x %02x (%02x) %02x %02x %02x (%02x), " |
| "%02x %02x %02x, %02x %02x %02x; %02x %02x\n", |
| rs5c->regs[0], rs5c->regs[1], rs5c->regs[2], rs5c->regs[3], |
| rs5c->regs[4], rs5c->regs[5], rs5c->regs[6], rs5c->regs[7], |
| rs5c->regs[8], rs5c->regs[9], rs5c->regs[10], rs5c->regs[11], |
| rs5c->regs[12], rs5c->regs[13], rs5c->regs[14], rs5c->regs[15]); |
| |
| return 0; |
| } |
| |
| static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg) |
| { |
| unsigned hour; |
| |
| if (rs5c->time24) |
| return bcd2bin(reg & 0x3f); |
| |
| hour = bcd2bin(reg & 0x1f); |
| if (hour == 12) |
| hour = 0; |
| if (reg & 0x20) |
| hour += 12; |
| return hour; |
| } |
| |
| static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour) |
| { |
| if (rs5c->time24) |
| return bin2bcd(hour); |
| |
| if (hour > 12) |
| return 0x20 | bin2bcd(hour - 12); |
| if (hour == 12) |
| return 0x20 | bin2bcd(12); |
| if (hour == 0) |
| return bin2bcd(12); |
| return bin2bcd(hour); |
| } |
| |
| static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm) |
| { |
| struct rs5c372 *rs5c = i2c_get_clientdata(client); |
| int status = rs5c_get_regs(rs5c); |
| |
| if (status < 0) |
| return status; |
| |
| tm->tm_sec = bcd2bin(rs5c->regs[RS5C372_REG_SECS] & 0x7f); |
| tm->tm_min = bcd2bin(rs5c->regs[RS5C372_REG_MINS] & 0x7f); |
| tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]); |
| |
| tm->tm_wday = bcd2bin(rs5c->regs[RS5C372_REG_WDAY] & 0x07); |
| tm->tm_mday = bcd2bin(rs5c->regs[RS5C372_REG_DAY] & 0x3f); |
| |
| /* tm->tm_mon is zero-based */ |
| tm->tm_mon = bcd2bin(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1; |
| |
| /* year is 1900 + tm->tm_year */ |
| tm->tm_year = bcd2bin(rs5c->regs[RS5C372_REG_YEAR]) + 100; |
| |
| dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " |
| "mday=%d, mon=%d, year=%d, wday=%d\n", |
| __func__, |
| tm->tm_sec, tm->tm_min, tm->tm_hour, |
| tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); |
| |
| /* rtc might need initialization */ |
| return rtc_valid_tm(tm); |
| } |
| |
| static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm) |
| { |
| struct rs5c372 *rs5c = i2c_get_clientdata(client); |
| unsigned char buf[8]; |
| int addr; |
| |
| dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d " |
| "mday=%d, mon=%d, year=%d, wday=%d\n", |
| __func__, |
| tm->tm_sec, tm->tm_min, tm->tm_hour, |
| tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); |
| |
| addr = RS5C_ADDR(RS5C372_REG_SECS); |
| buf[0] = bin2bcd(tm->tm_sec); |
| buf[1] = bin2bcd(tm->tm_min); |
| buf[2] = rs5c_hr2reg(rs5c, tm->tm_hour); |
| buf[3] = bin2bcd(tm->tm_wday); |
| buf[4] = bin2bcd(tm->tm_mday); |
| buf[5] = bin2bcd(tm->tm_mon + 1); |
| buf[6] = bin2bcd(tm->tm_year - 100); |
| |
| if (i2c_smbus_write_i2c_block_data(client, addr, sizeof(buf), buf) < 0) { |
| dev_err(&client->dev, "%s: write error\n", __func__); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) |
| #define NEED_TRIM |
| #endif |
| |
| #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) |
| #define NEED_TRIM |
| #endif |
| |
| #ifdef NEED_TRIM |
| static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim) |
| { |
| struct rs5c372 *rs5c372 = i2c_get_clientdata(client); |
| u8 tmp = rs5c372->regs[RS5C372_REG_TRIM]; |
| |
| if (osc) |
| *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768; |
| |
| if (trim) { |
| dev_dbg(&client->dev, "%s: raw trim=%x\n", __func__, tmp); |
| tmp &= RS5C372_TRIM_MASK; |
| if (tmp & 0x3e) { |
| int t = tmp & 0x3f; |
| |
| if (tmp & 0x40) |
| t = (~t | (s8)0xc0) + 1; |
| else |
| t = t - 1; |
| |
| tmp = t * 2; |
| } else |
| tmp = 0; |
| *trim = tmp; |
| } |
| |
| return 0; |
| } |
| #endif |
| |
| static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm) |
| { |
| return rs5c372_get_datetime(to_i2c_client(dev), tm); |
| } |
| |
| static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm) |
| { |
| return rs5c372_set_datetime(to_i2c_client(dev), tm); |
| } |
| |
| #if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE) |
| |
| static int |
| rs5c_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct rs5c372 *rs5c = i2c_get_clientdata(client); |
| unsigned char buf; |
| int status, addr; |
| |
| buf = rs5c->regs[RS5C_REG_CTRL1]; |
| switch (cmd) { |
| case RTC_UIE_OFF: |
| case RTC_UIE_ON: |
| /* some 327a modes use a different IRQ pin for 1Hz irqs */ |
| if (rs5c->type == rtc_rs5c372a |
| && (buf & RS5C372A_CTRL1_SL1)) |
| return -ENOIOCTLCMD; |
| case RTC_AIE_OFF: |
| case RTC_AIE_ON: |
| /* these irq management calls only make sense for chips |
| * which are wired up to an IRQ. |
| */ |
| if (!rs5c->has_irq) |
| return -ENOIOCTLCMD; |
| break; |
| default: |
| return -ENOIOCTLCMD; |
| } |
| |
| status = rs5c_get_regs(rs5c); |
| if (status < 0) |
| return status; |
| |
| addr = RS5C_ADDR(RS5C_REG_CTRL1); |
| switch (cmd) { |
| case RTC_AIE_OFF: /* alarm off */ |
| buf &= ~RS5C_CTRL1_AALE; |
| break; |
| case RTC_AIE_ON: /* alarm on */ |
| buf |= RS5C_CTRL1_AALE; |
| break; |
| case RTC_UIE_OFF: /* update off */ |
| buf &= ~RS5C_CTRL1_CT_MASK; |
| break; |
| case RTC_UIE_ON: /* update on */ |
| buf &= ~RS5C_CTRL1_CT_MASK; |
| buf |= RS5C_CTRL1_CT4; |
| break; |
| } |
| |
| if (i2c_smbus_write_byte_data(client, addr, buf) < 0) { |
| printk(KERN_WARNING "%s: can't update alarm\n", |
| rs5c->rtc->name); |
| status = -EIO; |
| } else |
| rs5c->regs[RS5C_REG_CTRL1] = buf; |
| |
| return status; |
| } |
| |
| #else |
| #define rs5c_rtc_ioctl NULL |
| #endif |
| |
| |
| /* NOTE: Since RTC_WKALM_{RD,SET} were originally defined for EFI, |
| * which only exposes a polled programming interface; and since |
| * these calls map directly to those EFI requests; we don't demand |
| * we have an IRQ for this chip when we go through this API. |
| * |
| * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs |
| * though, managed through RTC_AIE_{ON,OFF} requests. |
| */ |
| |
| static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct rs5c372 *rs5c = i2c_get_clientdata(client); |
| int status; |
| |
| status = rs5c_get_regs(rs5c); |
| if (status < 0) |
| return status; |
| |
| /* report alarm time */ |
| t->time.tm_sec = 0; |
| t->time.tm_min = bcd2bin(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f); |
| t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]); |
| t->time.tm_mday = -1; |
| t->time.tm_mon = -1; |
| t->time.tm_year = -1; |
| t->time.tm_wday = -1; |
| t->time.tm_yday = -1; |
| t->time.tm_isdst = -1; |
| |
| /* ... and status */ |
| t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE); |
| t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG); |
| |
| return 0; |
| } |
| |
| static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct rs5c372 *rs5c = i2c_get_clientdata(client); |
| int status, addr, i; |
| unsigned char buf[3]; |
| |
| /* only handle up to 24 hours in the future, like RTC_ALM_SET */ |
| if (t->time.tm_mday != -1 |
| || t->time.tm_mon != -1 |
| || t->time.tm_year != -1) |
| return -EINVAL; |
| |
| /* REVISIT: round up tm_sec */ |
| |
| /* if needed, disable irq (clears pending status) */ |
| status = rs5c_get_regs(rs5c); |
| if (status < 0) |
| return status; |
| if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) { |
| addr = RS5C_ADDR(RS5C_REG_CTRL1); |
| buf[0] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE; |
| if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) { |
| pr_debug("%s: can't disable alarm\n", rs5c->rtc->name); |
| return -EIO; |
| } |
| rs5c->regs[RS5C_REG_CTRL1] = buf[0]; |
| } |
| |
| /* set alarm */ |
| buf[0] = bin2bcd(t->time.tm_min); |
| buf[1] = rs5c_hr2reg(rs5c, t->time.tm_hour); |
| buf[2] = 0x7f; /* any/all days */ |
| |
| for (i = 0; i < sizeof(buf); i++) { |
| addr = RS5C_ADDR(RS5C_REG_ALARM_A_MIN + i); |
| if (i2c_smbus_write_byte_data(client, addr, buf[i]) < 0) { |
| pr_debug("%s: can't set alarm time\n", rs5c->rtc->name); |
| return -EIO; |
| } |
| } |
| |
| /* ... and maybe enable its irq */ |
| if (t->enabled) { |
| addr = RS5C_ADDR(RS5C_REG_CTRL1); |
| buf[0] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE; |
| if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) |
| printk(KERN_WARNING "%s: can't enable alarm\n", |
| rs5c->rtc->name); |
| rs5c->regs[RS5C_REG_CTRL1] = buf[0]; |
| } |
| |
| return 0; |
| } |
| |
| #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) |
| |
| static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq) |
| { |
| int err, osc, trim; |
| |
| err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim); |
| if (err == 0) { |
| seq_printf(seq, "crystal\t\t: %d.%03d KHz\n", |
| osc / 1000, osc % 1000); |
| seq_printf(seq, "trim\t\t: %d\n", trim); |
| } |
| |
| return 0; |
| } |
| |
| #else |
| #define rs5c372_rtc_proc NULL |
| #endif |
| |
| static const struct rtc_class_ops rs5c372_rtc_ops = { |
| .proc = rs5c372_rtc_proc, |
| .ioctl = rs5c_rtc_ioctl, |
| .read_time = rs5c372_rtc_read_time, |
| .set_time = rs5c372_rtc_set_time, |
| .read_alarm = rs5c_read_alarm, |
| .set_alarm = rs5c_set_alarm, |
| }; |
| |
| #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) |
| |
| static ssize_t rs5c372_sysfs_show_trim(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| int err, trim; |
| |
| err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim); |
| if (err) |
| return err; |
| |
| return sprintf(buf, "%d\n", trim); |
| } |
| static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL); |
| |
| static ssize_t rs5c372_sysfs_show_osc(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| int err, osc; |
| |
| err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL); |
| if (err) |
| return err; |
| |
| return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000); |
| } |
| static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL); |
| |
| static int rs5c_sysfs_register(struct device *dev) |
| { |
| int err; |
| |
| err = device_create_file(dev, &dev_attr_trim); |
| if (err) |
| return err; |
| err = device_create_file(dev, &dev_attr_osc); |
| if (err) |
| device_remove_file(dev, &dev_attr_trim); |
| |
| return err; |
| } |
| |
| static void rs5c_sysfs_unregister(struct device *dev) |
| { |
| device_remove_file(dev, &dev_attr_trim); |
| device_remove_file(dev, &dev_attr_osc); |
| } |
| |
| #else |
| static int rs5c_sysfs_register(struct device *dev) |
| { |
| return 0; |
| } |
| |
| static void rs5c_sysfs_unregister(struct device *dev) |
| { |
| /* nothing */ |
| } |
| #endif /* SYSFS */ |
| |
| static struct i2c_driver rs5c372_driver; |
| |
| static int rs5c_oscillator_setup(struct rs5c372 *rs5c372) |
| { |
| unsigned char buf[2]; |
| int addr, i, ret = 0; |
| |
| if (rs5c372->type == rtc_r2025sd) { |
| if (!(rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST)) |
| return ret; |
| rs5c372->regs[RS5C_REG_CTRL2] &= ~R2025_CTRL2_XST; |
| } else { |
| if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP)) |
| return ret; |
| rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP; |
| } |
| |
| addr = RS5C_ADDR(RS5C_REG_CTRL1); |
| buf[0] = rs5c372->regs[RS5C_REG_CTRL1]; |
| buf[1] = rs5c372->regs[RS5C_REG_CTRL2]; |
| |
| /* use 24hr mode */ |
| switch (rs5c372->type) { |
| case rtc_rs5c372a: |
| case rtc_rs5c372b: |
| buf[1] |= RS5C372_CTRL2_24; |
| rs5c372->time24 = 1; |
| break; |
| case rtc_r2025sd: |
| case rtc_rv5c386: |
| case rtc_rv5c387a: |
| buf[0] |= RV5C387_CTRL1_24; |
| rs5c372->time24 = 1; |
| break; |
| default: |
| /* impossible */ |
| break; |
| } |
| |
| for (i = 0; i < sizeof(buf); i++) { |
| addr = RS5C_ADDR(RS5C_REG_CTRL1 + i); |
| ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]); |
| if (unlikely(ret < 0)) |
| return ret; |
| } |
| |
| rs5c372->regs[RS5C_REG_CTRL1] = buf[0]; |
| rs5c372->regs[RS5C_REG_CTRL2] = buf[1]; |
| |
| return 0; |
| } |
| |
| static int rs5c372_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| int err = 0; |
| int smbus_mode = 0; |
| struct rs5c372 *rs5c372; |
| struct rtc_time tm; |
| |
| dev_dbg(&client->dev, "%s\n", __func__); |
| |
| if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | |
| I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) { |
| /* |
| * If we don't have any master mode adapter, try breaking |
| * it down in to the barest of capabilities. |
| */ |
| if (i2c_check_functionality(client->adapter, |
| I2C_FUNC_SMBUS_BYTE_DATA | |
| I2C_FUNC_SMBUS_I2C_BLOCK)) |
| smbus_mode = 1; |
| else { |
| /* Still no good, give up */ |
| err = -ENODEV; |
| goto exit; |
| } |
| } |
| |
| if (!(rs5c372 = kzalloc(sizeof(struct rs5c372), GFP_KERNEL))) { |
| err = -ENOMEM; |
| goto exit; |
| } |
| |
| rs5c372->client = client; |
| i2c_set_clientdata(client, rs5c372); |
| rs5c372->type = id->driver_data; |
| |
| /* we read registers 0x0f then 0x00-0x0f; skip the first one */ |
| rs5c372->regs = &rs5c372->buf[1]; |
| rs5c372->smbus = smbus_mode; |
| |
| err = rs5c_get_regs(rs5c372); |
| if (err < 0) |
| goto exit_kfree; |
| |
| /* clock may be set for am/pm or 24 hr time */ |
| switch (rs5c372->type) { |
| case rtc_rs5c372a: |
| case rtc_rs5c372b: |
| /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b. |
| * so does periodic irq, except some 327a modes. |
| */ |
| if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24) |
| rs5c372->time24 = 1; |
| break; |
| case rtc_r2025sd: |
| case rtc_rv5c386: |
| case rtc_rv5c387a: |
| if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24) |
| rs5c372->time24 = 1; |
| /* alarm uses ALARM_W; and nINTRB for alarm and periodic |
| * irq, on both 386 and 387 |
| */ |
| break; |
| default: |
| dev_err(&client->dev, "unknown RTC type\n"); |
| goto exit_kfree; |
| } |
| |
| /* if the oscillator lost power and no other software (like |
| * the bootloader) set it up, do it here. |
| * |
| * The R2025S/D does this a little differently than the other |
| * parts, so we special case that.. |
| */ |
| err = rs5c_oscillator_setup(rs5c372); |
| if (unlikely(err < 0)) { |
| dev_err(&client->dev, "setup error\n"); |
| goto exit_kfree; |
| } |
| |
| if (rs5c372_get_datetime(client, &tm) < 0) |
| dev_warn(&client->dev, "clock needs to be set\n"); |
| |
| dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n", |
| ({ char *s; switch (rs5c372->type) { |
| case rtc_r2025sd: s = "r2025sd"; break; |
| case rtc_rs5c372a: s = "rs5c372a"; break; |
| case rtc_rs5c372b: s = "rs5c372b"; break; |
| case rtc_rv5c386: s = "rv5c386"; break; |
| case rtc_rv5c387a: s = "rv5c387a"; break; |
| default: s = "chip"; break; |
| }; s;}), |
| rs5c372->time24 ? "24hr" : "am/pm" |
| ); |
| |
| /* REVISIT use client->irq to register alarm irq ... */ |
| |
| rs5c372->rtc = rtc_device_register(rs5c372_driver.driver.name, |
| &client->dev, &rs5c372_rtc_ops, THIS_MODULE); |
| |
| if (IS_ERR(rs5c372->rtc)) { |
| err = PTR_ERR(rs5c372->rtc); |
| goto exit_kfree; |
| } |
| |
| err = rs5c_sysfs_register(&client->dev); |
| if (err) |
| goto exit_devreg; |
| |
| return 0; |
| |
| exit_devreg: |
| rtc_device_unregister(rs5c372->rtc); |
| |
| exit_kfree: |
| kfree(rs5c372); |
| |
| exit: |
| return err; |
| } |
| |
| static int rs5c372_remove(struct i2c_client *client) |
| { |
| struct rs5c372 *rs5c372 = i2c_get_clientdata(client); |
| |
| rtc_device_unregister(rs5c372->rtc); |
| rs5c_sysfs_unregister(&client->dev); |
| kfree(rs5c372); |
| return 0; |
| } |
| |
| static struct i2c_driver rs5c372_driver = { |
| .driver = { |
| .name = "rtc-rs5c372", |
| }, |
| .probe = rs5c372_probe, |
| .remove = rs5c372_remove, |
| .id_table = rs5c372_id, |
| }; |
| |
| static __init int rs5c372_init(void) |
| { |
| return i2c_add_driver(&rs5c372_driver); |
| } |
| |
| static __exit void rs5c372_exit(void) |
| { |
| i2c_del_driver(&rs5c372_driver); |
| } |
| |
| module_init(rs5c372_init); |
| module_exit(rs5c372_exit); |
| |
| MODULE_AUTHOR( |
| "Pavel Mironchik <pmironchik@optifacio.net>, " |
| "Alessandro Zummo <a.zummo@towertech.it>, " |
| "Paul Mundt <lethal@linux-sh.org>"); |
| MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_VERSION(DRV_VERSION); |