| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| David Brownell | 1232 | 29.85% | 4 | 8.00% |
| Alessandro Zummo | 988 | 23.94% | 3 | 6.00% |
| Camel Guo | 757 | 18.34% | 3 | 6.00% |
| Paul Mundt | 384 | 9.30% | 3 | 6.00% |
| Oliver.Rohe | 210 | 5.09% | 2 | 4.00% |
| Javier Martinez Canillas | 141 | 3.42% | 2 | 4.00% |
| John Stultz | 102 | 2.47% | 1 | 2.00% |
| Riku Voipio | 73 | 1.77% | 1 | 2.00% |
| Jean Delvare | 57 | 1.38% | 4 | 8.00% |
| Jingoo Han | 44 | 1.07% | 2 | 4.00% |
| Adrian Bunk | 31 | 0.75% | 2 | 4.00% |
| Lucas Stach | 16 | 0.39% | 1 | 2.00% |
| Jeff Garzik | 16 | 0.39% | 1 | 2.00% |
| Shubhrajyoti Datta | 14 | 0.34% | 1 | 2.00% |
| Uwe Kleine-König | 14 | 0.34% | 3 | 6.00% |
| Alexandre Belloni | 12 | 0.29% | 4 | 8.00% |
| Marcelo Roberto Jimenez | 6 | 0.15% | 1 | 2.00% |
| Atsushi Nemoto | 6 | 0.15% | 1 | 2.00% |
| Andy Shevchenko | 5 | 0.12% | 1 | 2.00% |
| Harvey Harrison | 5 | 0.12% | 1 | 2.00% |
| Paul Gortmaker | 3 | 0.07% | 1 | 2.00% |
| Thomas Gleixner | 2 | 0.05% | 1 | 2.00% |
| Axel Lin | 2 | 0.05% | 1 | 2.00% |
| Linus Torvalds (pre-git) | 2 | 0.05% | 1 | 2.00% |
| Rob Herring | 1 | 0.02% | 1 | 2.00% |
| Linus Torvalds | 1 | 0.02% | 1 | 2.00% |
| shaomin Deng | 1 | 0.02% | 1 | 2.00% |
| Krzysztof Kozlowski | 1 | 0.02% | 1 | 2.00% |
| Wolfram Sang | 1 | 0.02% | 1 | 2.00% |
| Total | 4127 | 50 |
// SPDX-License-Identifier: GPL-2.0-only /* * 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 */ #include <linux/i2c.h> #include <linux/rtc.h> #include <linux/bcd.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/of.h> /* * 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 /* only if RS5C372[a|b] */ # define RS5C372_TRIM_MASK 0x7F # define R2221TL_TRIM_DEV (1 << 7) /* only if R2221TL */ # define RS5C372_TRIM_DECR (1 << 6) #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 RS5C_CTRL2_XSTP (1 << 4) /* only if !R2x2x */ # define R2x2x_CTRL2_VDET (1 << 6) /* only if R2x2x */ # define R2x2x_CTRL2_XSTP (1 << 5) /* only if R2x2x */ # define R2x2x_CTRL2_PON (1 << 4) /* only if R2x2x */ # 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_r2221tl, rtc_rs5c372a, rtc_rs5c372b, rtc_rv5c386, rtc_rv5c387a, }; static const struct i2c_device_id rs5c372_id[] = { { "r2025sd", rtc_r2025sd }, { "r2221tl", rtc_r2221tl }, { "rs5c372a", rtc_rs5c372a }, { "rs5c372b", rtc_rs5c372b }, { "rv5c386", rtc_rv5c386 }, { "rv5c387a", rtc_rv5c387a }, { } }; MODULE_DEVICE_TABLE(i2c, rs5c372_id); static const __maybe_unused struct of_device_id rs5c372_of_match[] = { { .compatible = "ricoh,r2025sd", .data = (void *)rtc_r2025sd }, { .compatible = "ricoh,r2221tl", .data = (void *)rtc_r2221tl }, { .compatible = "ricoh,rs5c372a", .data = (void *)rtc_rs5c372a }, { .compatible = "ricoh,rs5c372b", .data = (void *)rtc_rs5c372b }, { .compatible = "ricoh,rv5c386", .data = (void *)rtc_rv5c386 }, { .compatible = "ricoh,rv5c387a", .data = (void *)rtc_rv5c387a }, { } }; MODULE_DEVICE_TABLE(of, rs5c372_of_match); /* 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[] = { { .addr = client->addr, .flags = I2C_M_RD, .len = sizeof(rs5c->buf), .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 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, "%3ph (%02x) %3ph (%02x), %3ph, %3ph; %02x %02x\n", rs5c->regs + 0, rs5c->regs[3], rs5c->regs + 4, rs5c->regs[7], rs5c->regs + 8, rs5c->regs + 11, 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_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct i2c_client *client = to_i2c_client(dev); struct rs5c372 *rs5c = i2c_get_clientdata(client); int status = rs5c_get_regs(rs5c); unsigned char ctrl2 = rs5c->regs[RS5C_REG_CTRL2]; if (status < 0) return status; switch (rs5c->type) { case rtc_r2025sd: case rtc_r2221tl: if ((rs5c->type == rtc_r2025sd && !(ctrl2 & R2x2x_CTRL2_XSTP)) || (rs5c->type == rtc_r2221tl && (ctrl2 & R2x2x_CTRL2_XSTP))) { dev_warn(&client->dev, "rtc oscillator interruption detected. Please reset the rtc clock.\n"); return -EINVAL; } break; default: if (ctrl2 & RS5C_CTRL2_XSTP) { dev_warn(&client->dev, "rtc oscillator interruption detected. Please reset the rtc clock.\n"); return -EINVAL; } } 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); return 0; } static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct i2c_client *client = to_i2c_client(dev); struct rs5c372 *rs5c = i2c_get_clientdata(client); unsigned char buf[7]; unsigned char ctrl2; 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_dbg(&client->dev, "%s: write error in line %i\n", __func__, __LINE__); return -EIO; } addr = RS5C_ADDR(RS5C_REG_CTRL2); ctrl2 = i2c_smbus_read_byte_data(client, addr); /* clear rtc warning bits */ switch (rs5c->type) { case rtc_r2025sd: case rtc_r2221tl: ctrl2 &= ~(R2x2x_CTRL2_VDET | R2x2x_CTRL2_PON); if (rs5c->type == rtc_r2025sd) ctrl2 |= R2x2x_CTRL2_XSTP; else ctrl2 &= ~R2x2x_CTRL2_XSTP; break; default: ctrl2 &= ~RS5C_CTRL2_XSTP; break; } if (i2c_smbus_write_byte_data(client, addr, ctrl2) < 0) { dev_dbg(&client->dev, "%s: write error in line %i\n", __func__, __LINE__); return -EIO; } return 0; } #if IS_ENABLED(CONFIG_RTC_INTF_PROC) #define NEED_TRIM #endif #if IS_ENABLED(CONFIG_RTC_INTF_SYSFS) #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) { if (rs5c372->type == rtc_rs5c372a || rs5c372->type == rtc_rs5c372b) *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768; else *osc = 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 rs5c_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) { 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]; if (!rs5c->has_irq) return -EINVAL; status = rs5c_get_regs(rs5c); if (status < 0) return status; addr = RS5C_ADDR(RS5C_REG_CTRL1); if (enabled) buf |= RS5C_CTRL1_AALE; else buf &= ~RS5C_CTRL1_AALE; if (i2c_smbus_write_byte_data(client, addr, buf) < 0) { dev_warn(dev, "can't update alarm\n"); status = -EIO; } else rs5c->regs[RS5C_REG_CTRL1] = buf; return status; } /* 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]); /* ... 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) { dev_dbg(dev, "can't disable alarm\n"); 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) { dev_dbg(dev, "can't set alarm time\n"); 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) dev_warn(dev, "can't enable alarm\n"); rs5c->regs[RS5C_REG_CTRL1] = buf[0]; } return 0; } #if IS_ENABLED(CONFIG_RTC_INTF_PROC) 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 #ifdef CONFIG_RTC_INTF_DEV static int rs5c372_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) { struct rs5c372 *rs5c = i2c_get_clientdata(to_i2c_client(dev)); unsigned char ctrl2; int addr; unsigned int flags; dev_dbg(dev, "%s: cmd=%x\n", __func__, cmd); addr = RS5C_ADDR(RS5C_REG_CTRL2); ctrl2 = i2c_smbus_read_byte_data(rs5c->client, addr); switch (cmd) { case RTC_VL_READ: flags = 0; switch (rs5c->type) { case rtc_r2025sd: case rtc_r2221tl: if ((rs5c->type == rtc_r2025sd && !(ctrl2 & R2x2x_CTRL2_XSTP)) || (rs5c->type == rtc_r2221tl && (ctrl2 & R2x2x_CTRL2_XSTP))) { flags |= RTC_VL_DATA_INVALID; } if (ctrl2 & R2x2x_CTRL2_VDET) flags |= RTC_VL_BACKUP_LOW; break; default: if (ctrl2 & RS5C_CTRL2_XSTP) flags |= RTC_VL_DATA_INVALID; break; } return put_user(flags, (unsigned int __user *)arg); case RTC_VL_CLR: /* clear VDET bit */ if (rs5c->type == rtc_r2025sd || rs5c->type == rtc_r2221tl) { ctrl2 &= ~R2x2x_CTRL2_VDET; if (i2c_smbus_write_byte_data(rs5c->client, addr, ctrl2) < 0) { dev_dbg(&rs5c->client->dev, "%s: write error in line %i\n", __func__, __LINE__); return -EIO; } } return 0; default: return -ENOIOCTLCMD; } return 0; } #else #define rs5c372_ioctl NULL #endif static int rs5c372_read_offset(struct device *dev, long *offset) { struct rs5c372 *rs5c = i2c_get_clientdata(to_i2c_client(dev)); u8 val = rs5c->regs[RS5C372_REG_TRIM]; long ppb_per_step = 0; bool decr = val & RS5C372_TRIM_DECR; switch (rs5c->type) { case rtc_r2221tl: ppb_per_step = val & R2221TL_TRIM_DEV ? 1017 : 3051; break; case rtc_rs5c372a: case rtc_rs5c372b: ppb_per_step = val & RS5C372_TRIM_XSL ? 3125 : 3051; break; default: ppb_per_step = 3051; break; } /* Only bits[0:5] repsents the time counts */ val &= 0x3F; /* If bits[1:5] are all 0, it means no increment or decrement */ if (!(val & 0x3E)) { *offset = 0; } else { if (decr) *offset = -(((~val) & 0x3F) + 1) * ppb_per_step; else *offset = (val - 1) * ppb_per_step; } return 0; } static int rs5c372_set_offset(struct device *dev, long offset) { struct rs5c372 *rs5c = i2c_get_clientdata(to_i2c_client(dev)); int addr = RS5C_ADDR(RS5C372_REG_TRIM); u8 val = 0; u8 tmp = 0; long ppb_per_step = 3051; long steps = LONG_MIN; switch (rs5c->type) { case rtc_rs5c372a: case rtc_rs5c372b: tmp = rs5c->regs[RS5C372_REG_TRIM]; if (tmp & RS5C372_TRIM_XSL) { ppb_per_step = 3125; val |= RS5C372_TRIM_XSL; } break; case rtc_r2221tl: /* * Check if it is possible to use high resolution mode (DEV=1). * In this mode, the minimum resolution is 2 / (32768 * 20 * 3), * which is about 1017 ppb. */ steps = DIV_ROUND_CLOSEST(offset, 1017); if (steps >= -0x3E && steps <= 0x3E) { ppb_per_step = 1017; val |= R2221TL_TRIM_DEV; } else { /* * offset is out of the range of high resolution mode. * Try to use low resolution mode (DEV=0). In this mode, * the minimum resolution is 2 / (32768 * 20), which is * about 3051 ppb. */ steps = LONG_MIN; } break; default: break; } if (steps == LONG_MIN) { steps = DIV_ROUND_CLOSEST(offset, ppb_per_step); if (steps > 0x3E || steps < -0x3E) return -ERANGE; } if (steps > 0) { val |= steps + 1; } else { val |= RS5C372_TRIM_DECR; val |= (~(-steps - 1)) & 0x3F; } if (!steps || !(val & 0x3E)) { /* * if offset is too small, set oscillation adjustment register * or time trimming register with its default value whic means * no increment or decrement. But for rs5c372[a|b], the XSL bit * should be kept unchanged. */ if (rs5c->type == rtc_rs5c372a || rs5c->type == rtc_rs5c372b) val &= RS5C372_TRIM_XSL; else val = 0; } dev_dbg(&rs5c->client->dev, "write 0x%x for offset %ld\n", val, offset); if (i2c_smbus_write_byte_data(rs5c->client, addr, val) < 0) { dev_err(&rs5c->client->dev, "failed to write 0x%x to reg %d\n", val, addr); return -EIO; } rs5c->regs[RS5C372_REG_TRIM] = val; return 0; } static const struct rtc_class_ops rs5c372_rtc_ops = { .proc = rs5c372_rtc_proc, .read_time = rs5c372_rtc_read_time, .set_time = rs5c372_rtc_set_time, .read_alarm = rs5c_read_alarm, .set_alarm = rs5c_set_alarm, .alarm_irq_enable = rs5c_rtc_alarm_irq_enable, .ioctl = rs5c372_ioctl, .read_offset = rs5c372_read_offset, .set_offset = rs5c372_set_offset, }; #if IS_ENABLED(CONFIG_RTC_INTF_SYSFS) 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; addr = RS5C_ADDR(RS5C_REG_CTRL1); buf[0] = rs5c372->regs[RS5C_REG_CTRL1]; buf[1] = rs5c372->regs[RS5C_REG_CTRL2]; switch (rs5c372->type) { case rtc_r2025sd: if (buf[1] & R2x2x_CTRL2_XSTP) return ret; break; case rtc_r2221tl: if (!(buf[1] & R2x2x_CTRL2_XSTP)) return ret; break; default: if (!(buf[1] & RS5C_CTRL2_XSTP)) return ret; break; } /* 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_r2221tl: 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) { int err = 0; int smbus_mode = 0; struct rs5c372 *rs5c372; 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; } } rs5c372 = devm_kzalloc(&client->dev, sizeof(struct rs5c372), GFP_KERNEL); if (!rs5c372) { err = -ENOMEM; goto exit; } rs5c372->client = client; i2c_set_clientdata(client, rs5c372); if (client->dev.of_node) { rs5c372->type = (uintptr_t)of_device_get_match_data(&client->dev); } else { const struct i2c_device_id *id = i2c_match_id(rs5c372_id, client); 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; /* 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_r2221tl: 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; } /* 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; } dev_info(&client->dev, "%s found, %s\n", ({ char *s; switch (rs5c372->type) { case rtc_r2025sd: s = "r2025sd"; break; case rtc_r2221tl: s = "r2221tl"; 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 = devm_rtc_device_register(&client->dev, rs5c372_driver.driver.name, &rs5c372_rtc_ops, THIS_MODULE); if (IS_ERR(rs5c372->rtc)) { err = PTR_ERR(rs5c372->rtc); goto exit; } err = rs5c_sysfs_register(&client->dev); if (err) goto exit; return 0; exit: return err; } static void rs5c372_remove(struct i2c_client *client) { rs5c_sysfs_unregister(&client->dev); } static struct i2c_driver rs5c372_driver = { .driver = { .name = "rtc-rs5c372", .of_match_table = of_match_ptr(rs5c372_of_match), }, .probe = rs5c372_probe, .remove = rs5c372_remove, .id_table = rs5c372_id, }; module_i2c_driver(rs5c372_driver); 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");
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