Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 1 | /* |
| 2 | * I2C client/driver for the ST M41T80 family of i2c rtc chips. |
| 3 | * |
| 4 | * Author: Alexander Bigga <ab@mycable.de> |
| 5 | * |
| 6 | * Based on m41t00.c by Mark A. Greer <mgreer@mvista.com> |
| 7 | * |
| 8 | * 2006 (c) mycable GmbH |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | * |
| 14 | */ |
| 15 | |
Maciej W. Rozycki | 35aa64f | 2008-07-23 21:30:29 -0700 | [diff] [blame] | 16 | #include <linux/bcd.h> |
| 17 | #include <linux/i2c.h> |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 18 | #include <linux/init.h> |
Maciej W. Rozycki | 9fb1f68 | 2008-05-12 14:02:38 -0700 | [diff] [blame] | 19 | #include <linux/kernel.h> |
Maciej W. Rozycki | 35aa64f | 2008-07-23 21:30:29 -0700 | [diff] [blame] | 20 | #include <linux/module.h> |
| 21 | #include <linux/rtc.h> |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 22 | #include <linux/slab.h> |
Arnd Bergmann | 4101273 | 2008-05-20 19:16:39 +0200 | [diff] [blame] | 23 | #include <linux/smp_lock.h> |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 24 | #include <linux/string.h> |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 25 | #ifdef CONFIG_RTC_DRV_M41T80_WDT |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 26 | #include <linux/fs.h> |
| 27 | #include <linux/ioctl.h> |
Maciej W. Rozycki | 35aa64f | 2008-07-23 21:30:29 -0700 | [diff] [blame] | 28 | #include <linux/miscdevice.h> |
| 29 | #include <linux/reboot.h> |
| 30 | #include <linux/watchdog.h> |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 31 | #endif |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 32 | |
| 33 | #define M41T80_REG_SSEC 0 |
| 34 | #define M41T80_REG_SEC 1 |
| 35 | #define M41T80_REG_MIN 2 |
| 36 | #define M41T80_REG_HOUR 3 |
| 37 | #define M41T80_REG_WDAY 4 |
| 38 | #define M41T80_REG_DAY 5 |
| 39 | #define M41T80_REG_MON 6 |
| 40 | #define M41T80_REG_YEAR 7 |
| 41 | #define M41T80_REG_ALARM_MON 0xa |
| 42 | #define M41T80_REG_ALARM_DAY 0xb |
| 43 | #define M41T80_REG_ALARM_HOUR 0xc |
| 44 | #define M41T80_REG_ALARM_MIN 0xd |
| 45 | #define M41T80_REG_ALARM_SEC 0xe |
| 46 | #define M41T80_REG_FLAGS 0xf |
| 47 | #define M41T80_REG_SQW 0x13 |
| 48 | |
| 49 | #define M41T80_DATETIME_REG_SIZE (M41T80_REG_YEAR + 1) |
| 50 | #define M41T80_ALARM_REG_SIZE \ |
| 51 | (M41T80_REG_ALARM_SEC + 1 - M41T80_REG_ALARM_MON) |
| 52 | |
| 53 | #define M41T80_SEC_ST (1 << 7) /* ST: Stop Bit */ |
| 54 | #define M41T80_ALMON_AFE (1 << 7) /* AFE: AF Enable Bit */ |
| 55 | #define M41T80_ALMON_SQWE (1 << 6) /* SQWE: SQW Enable Bit */ |
| 56 | #define M41T80_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */ |
| 57 | #define M41T80_FLAGS_AF (1 << 6) /* AF: Alarm Flag Bit */ |
| 58 | #define M41T80_FLAGS_BATT_LOW (1 << 4) /* BL: Battery Low Bit */ |
Steven A. Falco | d3a126f | 2008-10-15 22:03:07 -0700 | [diff] [blame] | 59 | #define M41T80_WATCHDOG_RB2 (1 << 7) /* RB: Watchdog resolution */ |
| 60 | #define M41T80_WATCHDOG_RB1 (1 << 1) /* RB: Watchdog resolution */ |
| 61 | #define M41T80_WATCHDOG_RB0 (1 << 0) /* RB: Watchdog resolution */ |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 62 | |
Steven A. Falco | d3a126f | 2008-10-15 22:03:07 -0700 | [diff] [blame] | 63 | #define M41T80_FEATURE_HT (1 << 0) /* Halt feature */ |
| 64 | #define M41T80_FEATURE_BL (1 << 1) /* Battery low indicator */ |
| 65 | #define M41T80_FEATURE_SQ (1 << 2) /* Squarewave feature */ |
| 66 | #define M41T80_FEATURE_WD (1 << 3) /* Extra watchdog resolution */ |
Daniel Glockner | f30281f | 2009-04-02 16:57:03 -0700 | [diff] [blame] | 67 | #define M41T80_FEATURE_SQ_ALT (1 << 4) /* RSx bits are in reg 4 */ |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 68 | |
| 69 | #define DRV_VERSION "0.05" |
| 70 | |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 71 | static const struct i2c_device_id m41t80_id[] = { |
Daniel Glockner | f30281f | 2009-04-02 16:57:03 -0700 | [diff] [blame] | 72 | { "m41t62", M41T80_FEATURE_SQ | M41T80_FEATURE_SQ_ALT }, |
Steven A. Falco | d3a126f | 2008-10-15 22:03:07 -0700 | [diff] [blame] | 73 | { "m41t65", M41T80_FEATURE_HT | M41T80_FEATURE_WD }, |
| 74 | { "m41t80", M41T80_FEATURE_SQ }, |
| 75 | { "m41t81", M41T80_FEATURE_HT | M41T80_FEATURE_SQ}, |
| 76 | { "m41t81s", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, |
| 77 | { "m41t82", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, |
| 78 | { "m41t83", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, |
| 79 | { "m41st84", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, |
| 80 | { "m41st85", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, |
| 81 | { "m41st87", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 82 | { } |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 83 | }; |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 84 | MODULE_DEVICE_TABLE(i2c, m41t80_id); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 85 | |
| 86 | struct m41t80_data { |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 87 | u8 features; |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 88 | struct rtc_device *rtc; |
| 89 | }; |
| 90 | |
| 91 | static int m41t80_get_datetime(struct i2c_client *client, |
| 92 | struct rtc_time *tm) |
| 93 | { |
| 94 | u8 buf[M41T80_DATETIME_REG_SIZE], dt_addr[1] = { M41T80_REG_SEC }; |
| 95 | struct i2c_msg msgs[] = { |
| 96 | { |
| 97 | .addr = client->addr, |
| 98 | .flags = 0, |
| 99 | .len = 1, |
| 100 | .buf = dt_addr, |
| 101 | }, |
| 102 | { |
| 103 | .addr = client->addr, |
| 104 | .flags = I2C_M_RD, |
| 105 | .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, |
| 106 | .buf = buf + M41T80_REG_SEC, |
| 107 | }, |
| 108 | }; |
| 109 | |
| 110 | if (i2c_transfer(client->adapter, msgs, 2) < 0) { |
| 111 | dev_err(&client->dev, "read error\n"); |
| 112 | return -EIO; |
| 113 | } |
| 114 | |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 115 | tm->tm_sec = bcd2bin(buf[M41T80_REG_SEC] & 0x7f); |
| 116 | tm->tm_min = bcd2bin(buf[M41T80_REG_MIN] & 0x7f); |
| 117 | tm->tm_hour = bcd2bin(buf[M41T80_REG_HOUR] & 0x3f); |
| 118 | tm->tm_mday = bcd2bin(buf[M41T80_REG_DAY] & 0x3f); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 119 | tm->tm_wday = buf[M41T80_REG_WDAY] & 0x07; |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 120 | tm->tm_mon = bcd2bin(buf[M41T80_REG_MON] & 0x1f) - 1; |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 121 | |
| 122 | /* assume 20YY not 19YY, and ignore the Century Bit */ |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 123 | tm->tm_year = bcd2bin(buf[M41T80_REG_YEAR]) + 100; |
Wan ZongShun | b485fe5 | 2010-08-10 18:02:15 -0700 | [diff] [blame] | 124 | return rtc_valid_tm(tm); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 125 | } |
| 126 | |
| 127 | /* Sets the given date and time to the real time clock. */ |
| 128 | static int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm) |
| 129 | { |
| 130 | u8 wbuf[1 + M41T80_DATETIME_REG_SIZE]; |
| 131 | u8 *buf = &wbuf[1]; |
| 132 | u8 dt_addr[1] = { M41T80_REG_SEC }; |
| 133 | struct i2c_msg msgs_in[] = { |
| 134 | { |
| 135 | .addr = client->addr, |
| 136 | .flags = 0, |
| 137 | .len = 1, |
| 138 | .buf = dt_addr, |
| 139 | }, |
| 140 | { |
| 141 | .addr = client->addr, |
| 142 | .flags = I2C_M_RD, |
| 143 | .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, |
| 144 | .buf = buf + M41T80_REG_SEC, |
| 145 | }, |
| 146 | }; |
| 147 | struct i2c_msg msgs[] = { |
| 148 | { |
| 149 | .addr = client->addr, |
| 150 | .flags = 0, |
| 151 | .len = 1 + M41T80_DATETIME_REG_SIZE, |
| 152 | .buf = wbuf, |
| 153 | }, |
| 154 | }; |
| 155 | |
| 156 | /* Read current reg values into buf[1..7] */ |
| 157 | if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { |
| 158 | dev_err(&client->dev, "read error\n"); |
| 159 | return -EIO; |
| 160 | } |
| 161 | |
| 162 | wbuf[0] = 0; /* offset into rtc's regs */ |
| 163 | /* Merge time-data and register flags into buf[0..7] */ |
| 164 | buf[M41T80_REG_SSEC] = 0; |
| 165 | buf[M41T80_REG_SEC] = |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 166 | bin2bcd(tm->tm_sec) | (buf[M41T80_REG_SEC] & ~0x7f); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 167 | buf[M41T80_REG_MIN] = |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 168 | bin2bcd(tm->tm_min) | (buf[M41T80_REG_MIN] & ~0x7f); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 169 | buf[M41T80_REG_HOUR] = |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 170 | bin2bcd(tm->tm_hour) | (buf[M41T80_REG_HOUR] & ~0x3f) ; |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 171 | buf[M41T80_REG_WDAY] = |
| 172 | (tm->tm_wday & 0x07) | (buf[M41T80_REG_WDAY] & ~0x07); |
| 173 | buf[M41T80_REG_DAY] = |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 174 | bin2bcd(tm->tm_mday) | (buf[M41T80_REG_DAY] & ~0x3f); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 175 | buf[M41T80_REG_MON] = |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 176 | bin2bcd(tm->tm_mon + 1) | (buf[M41T80_REG_MON] & ~0x1f); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 177 | /* assume 20YY not 19YY */ |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 178 | buf[M41T80_REG_YEAR] = bin2bcd(tm->tm_year % 100); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 179 | |
| 180 | if (i2c_transfer(client->adapter, msgs, 1) != 1) { |
| 181 | dev_err(&client->dev, "write error\n"); |
| 182 | return -EIO; |
| 183 | } |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) |
| 188 | static int m41t80_rtc_proc(struct device *dev, struct seq_file *seq) |
| 189 | { |
| 190 | struct i2c_client *client = to_i2c_client(dev); |
| 191 | struct m41t80_data *clientdata = i2c_get_clientdata(client); |
| 192 | u8 reg; |
| 193 | |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 194 | if (clientdata->features & M41T80_FEATURE_BL) { |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 195 | reg = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); |
| 196 | seq_printf(seq, "battery\t\t: %s\n", |
| 197 | (reg & M41T80_FLAGS_BATT_LOW) ? "exhausted" : "ok"); |
| 198 | } |
| 199 | return 0; |
| 200 | } |
| 201 | #else |
| 202 | #define m41t80_rtc_proc NULL |
| 203 | #endif |
| 204 | |
| 205 | static int m41t80_rtc_read_time(struct device *dev, struct rtc_time *tm) |
| 206 | { |
| 207 | return m41t80_get_datetime(to_i2c_client(dev), tm); |
| 208 | } |
| 209 | |
| 210 | static int m41t80_rtc_set_time(struct device *dev, struct rtc_time *tm) |
| 211 | { |
| 212 | return m41t80_set_datetime(to_i2c_client(dev), tm); |
| 213 | } |
| 214 | |
| 215 | #if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE) |
| 216 | static int |
| 217 | m41t80_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) |
| 218 | { |
| 219 | struct i2c_client *client = to_i2c_client(dev); |
| 220 | int rc; |
| 221 | |
| 222 | switch (cmd) { |
| 223 | case RTC_AIE_OFF: |
| 224 | case RTC_AIE_ON: |
| 225 | break; |
| 226 | default: |
| 227 | return -ENOIOCTLCMD; |
| 228 | } |
| 229 | |
| 230 | rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); |
| 231 | if (rc < 0) |
| 232 | goto err; |
| 233 | switch (cmd) { |
| 234 | case RTC_AIE_OFF: |
| 235 | rc &= ~M41T80_ALMON_AFE; |
| 236 | break; |
| 237 | case RTC_AIE_ON: |
| 238 | rc |= M41T80_ALMON_AFE; |
| 239 | break; |
| 240 | } |
| 241 | if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, rc) < 0) |
| 242 | goto err; |
| 243 | return 0; |
| 244 | err: |
| 245 | return -EIO; |
| 246 | } |
| 247 | #else |
| 248 | #define m41t80_rtc_ioctl NULL |
| 249 | #endif |
| 250 | |
| 251 | static int m41t80_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *t) |
| 252 | { |
| 253 | struct i2c_client *client = to_i2c_client(dev); |
| 254 | u8 wbuf[1 + M41T80_ALARM_REG_SIZE]; |
| 255 | u8 *buf = &wbuf[1]; |
| 256 | u8 *reg = buf - M41T80_REG_ALARM_MON; |
| 257 | u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; |
| 258 | struct i2c_msg msgs_in[] = { |
| 259 | { |
| 260 | .addr = client->addr, |
| 261 | .flags = 0, |
| 262 | .len = 1, |
| 263 | .buf = dt_addr, |
| 264 | }, |
| 265 | { |
| 266 | .addr = client->addr, |
| 267 | .flags = I2C_M_RD, |
| 268 | .len = M41T80_ALARM_REG_SIZE, |
| 269 | .buf = buf, |
| 270 | }, |
| 271 | }; |
| 272 | struct i2c_msg msgs[] = { |
| 273 | { |
| 274 | .addr = client->addr, |
| 275 | .flags = 0, |
| 276 | .len = 1 + M41T80_ALARM_REG_SIZE, |
| 277 | .buf = wbuf, |
| 278 | }, |
| 279 | }; |
| 280 | |
| 281 | if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { |
| 282 | dev_err(&client->dev, "read error\n"); |
| 283 | return -EIO; |
| 284 | } |
| 285 | reg[M41T80_REG_ALARM_MON] &= ~(0x1f | M41T80_ALMON_AFE); |
| 286 | reg[M41T80_REG_ALARM_DAY] = 0; |
| 287 | reg[M41T80_REG_ALARM_HOUR] &= ~(0x3f | 0x80); |
| 288 | reg[M41T80_REG_ALARM_MIN] = 0; |
| 289 | reg[M41T80_REG_ALARM_SEC] = 0; |
| 290 | |
| 291 | wbuf[0] = M41T80_REG_ALARM_MON; /* offset into rtc's regs */ |
| 292 | reg[M41T80_REG_ALARM_SEC] |= t->time.tm_sec >= 0 ? |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 293 | bin2bcd(t->time.tm_sec) : 0x80; |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 294 | reg[M41T80_REG_ALARM_MIN] |= t->time.tm_min >= 0 ? |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 295 | bin2bcd(t->time.tm_min) : 0x80; |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 296 | reg[M41T80_REG_ALARM_HOUR] |= t->time.tm_hour >= 0 ? |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 297 | bin2bcd(t->time.tm_hour) : 0x80; |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 298 | reg[M41T80_REG_ALARM_DAY] |= t->time.tm_mday >= 0 ? |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 299 | bin2bcd(t->time.tm_mday) : 0x80; |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 300 | if (t->time.tm_mon >= 0) |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 301 | reg[M41T80_REG_ALARM_MON] |= bin2bcd(t->time.tm_mon + 1); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 302 | else |
| 303 | reg[M41T80_REG_ALARM_DAY] |= 0x40; |
| 304 | |
| 305 | if (i2c_transfer(client->adapter, msgs, 1) != 1) { |
| 306 | dev_err(&client->dev, "write error\n"); |
| 307 | return -EIO; |
| 308 | } |
| 309 | |
| 310 | if (t->enabled) { |
| 311 | reg[M41T80_REG_ALARM_MON] |= M41T80_ALMON_AFE; |
| 312 | if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, |
| 313 | reg[M41T80_REG_ALARM_MON]) < 0) { |
| 314 | dev_err(&client->dev, "write error\n"); |
| 315 | return -EIO; |
| 316 | } |
| 317 | } |
| 318 | return 0; |
| 319 | } |
| 320 | |
| 321 | static int m41t80_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *t) |
| 322 | { |
| 323 | struct i2c_client *client = to_i2c_client(dev); |
| 324 | u8 buf[M41T80_ALARM_REG_SIZE + 1]; /* all alarm regs and flags */ |
| 325 | u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; |
| 326 | u8 *reg = buf - M41T80_REG_ALARM_MON; |
| 327 | struct i2c_msg msgs[] = { |
| 328 | { |
| 329 | .addr = client->addr, |
| 330 | .flags = 0, |
| 331 | .len = 1, |
| 332 | .buf = dt_addr, |
| 333 | }, |
| 334 | { |
| 335 | .addr = client->addr, |
| 336 | .flags = I2C_M_RD, |
| 337 | .len = M41T80_ALARM_REG_SIZE + 1, |
| 338 | .buf = buf, |
| 339 | }, |
| 340 | }; |
| 341 | |
| 342 | if (i2c_transfer(client->adapter, msgs, 2) < 0) { |
| 343 | dev_err(&client->dev, "read error\n"); |
| 344 | return -EIO; |
| 345 | } |
| 346 | t->time.tm_sec = -1; |
| 347 | t->time.tm_min = -1; |
| 348 | t->time.tm_hour = -1; |
| 349 | t->time.tm_mday = -1; |
| 350 | t->time.tm_mon = -1; |
| 351 | if (!(reg[M41T80_REG_ALARM_SEC] & 0x80)) |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 352 | t->time.tm_sec = bcd2bin(reg[M41T80_REG_ALARM_SEC] & 0x7f); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 353 | if (!(reg[M41T80_REG_ALARM_MIN] & 0x80)) |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 354 | t->time.tm_min = bcd2bin(reg[M41T80_REG_ALARM_MIN] & 0x7f); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 355 | if (!(reg[M41T80_REG_ALARM_HOUR] & 0x80)) |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 356 | t->time.tm_hour = bcd2bin(reg[M41T80_REG_ALARM_HOUR] & 0x3f); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 357 | if (!(reg[M41T80_REG_ALARM_DAY] & 0x80)) |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 358 | t->time.tm_mday = bcd2bin(reg[M41T80_REG_ALARM_DAY] & 0x3f); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 359 | if (!(reg[M41T80_REG_ALARM_DAY] & 0x40)) |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 360 | t->time.tm_mon = bcd2bin(reg[M41T80_REG_ALARM_MON] & 0x1f) - 1; |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 361 | t->time.tm_year = -1; |
| 362 | t->time.tm_wday = -1; |
| 363 | t->time.tm_yday = -1; |
| 364 | t->time.tm_isdst = -1; |
| 365 | t->enabled = !!(reg[M41T80_REG_ALARM_MON] & M41T80_ALMON_AFE); |
| 366 | t->pending = !!(reg[M41T80_REG_FLAGS] & M41T80_FLAGS_AF); |
Wan ZongShun | b485fe5 | 2010-08-10 18:02:15 -0700 | [diff] [blame] | 367 | return rtc_valid_tm(t); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | static struct rtc_class_ops m41t80_rtc_ops = { |
| 371 | .read_time = m41t80_rtc_read_time, |
| 372 | .set_time = m41t80_rtc_set_time, |
| 373 | .read_alarm = m41t80_rtc_read_alarm, |
| 374 | .set_alarm = m41t80_rtc_set_alarm, |
| 375 | .proc = m41t80_rtc_proc, |
| 376 | .ioctl = m41t80_rtc_ioctl, |
| 377 | }; |
| 378 | |
| 379 | #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) |
| 380 | static ssize_t m41t80_sysfs_show_flags(struct device *dev, |
| 381 | struct device_attribute *attr, char *buf) |
| 382 | { |
| 383 | struct i2c_client *client = to_i2c_client(dev); |
| 384 | int val; |
| 385 | |
| 386 | val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); |
| 387 | if (val < 0) |
| 388 | return -EIO; |
| 389 | return sprintf(buf, "%#x\n", val); |
| 390 | } |
| 391 | static DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL); |
| 392 | |
| 393 | static ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev, |
| 394 | struct device_attribute *attr, char *buf) |
| 395 | { |
| 396 | struct i2c_client *client = to_i2c_client(dev); |
Steven A. Falco | d3a126f | 2008-10-15 22:03:07 -0700 | [diff] [blame] | 397 | struct m41t80_data *clientdata = i2c_get_clientdata(client); |
Daniel Glockner | f30281f | 2009-04-02 16:57:03 -0700 | [diff] [blame] | 398 | int val, reg_sqw; |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 399 | |
Steven A. Falco | d3a126f | 2008-10-15 22:03:07 -0700 | [diff] [blame] | 400 | if (!(clientdata->features & M41T80_FEATURE_SQ)) |
| 401 | return -EINVAL; |
| 402 | |
Daniel Glockner | f30281f | 2009-04-02 16:57:03 -0700 | [diff] [blame] | 403 | reg_sqw = M41T80_REG_SQW; |
| 404 | if (clientdata->features & M41T80_FEATURE_SQ_ALT) |
| 405 | reg_sqw = M41T80_REG_WDAY; |
| 406 | val = i2c_smbus_read_byte_data(client, reg_sqw); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 407 | if (val < 0) |
| 408 | return -EIO; |
| 409 | val = (val >> 4) & 0xf; |
| 410 | switch (val) { |
| 411 | case 0: |
| 412 | break; |
| 413 | case 1: |
| 414 | val = 32768; |
| 415 | break; |
| 416 | default: |
| 417 | val = 32768 >> val; |
| 418 | } |
| 419 | return sprintf(buf, "%d\n", val); |
| 420 | } |
| 421 | static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev, |
| 422 | struct device_attribute *attr, |
| 423 | const char *buf, size_t count) |
| 424 | { |
| 425 | struct i2c_client *client = to_i2c_client(dev); |
Steven A. Falco | d3a126f | 2008-10-15 22:03:07 -0700 | [diff] [blame] | 426 | struct m41t80_data *clientdata = i2c_get_clientdata(client); |
Daniel Glockner | f30281f | 2009-04-02 16:57:03 -0700 | [diff] [blame] | 427 | int almon, sqw, reg_sqw; |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 428 | int val = simple_strtoul(buf, NULL, 0); |
| 429 | |
Steven A. Falco | d3a126f | 2008-10-15 22:03:07 -0700 | [diff] [blame] | 430 | if (!(clientdata->features & M41T80_FEATURE_SQ)) |
| 431 | return -EINVAL; |
| 432 | |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 433 | if (val) { |
| 434 | if (!is_power_of_2(val)) |
| 435 | return -EINVAL; |
| 436 | val = ilog2(val); |
| 437 | if (val == 15) |
| 438 | val = 1; |
| 439 | else if (val < 14) |
| 440 | val = 15 - val; |
| 441 | else |
| 442 | return -EINVAL; |
| 443 | } |
| 444 | /* disable SQW, set SQW frequency & re-enable */ |
| 445 | almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); |
| 446 | if (almon < 0) |
| 447 | return -EIO; |
Daniel Glockner | f30281f | 2009-04-02 16:57:03 -0700 | [diff] [blame] | 448 | reg_sqw = M41T80_REG_SQW; |
| 449 | if (clientdata->features & M41T80_FEATURE_SQ_ALT) |
| 450 | reg_sqw = M41T80_REG_WDAY; |
| 451 | sqw = i2c_smbus_read_byte_data(client, reg_sqw); |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 452 | if (sqw < 0) |
| 453 | return -EIO; |
| 454 | sqw = (sqw & 0x0f) | (val << 4); |
| 455 | if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, |
| 456 | almon & ~M41T80_ALMON_SQWE) < 0 || |
Daniel Glockner | f30281f | 2009-04-02 16:57:03 -0700 | [diff] [blame] | 457 | i2c_smbus_write_byte_data(client, reg_sqw, sqw) < 0) |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 458 | return -EIO; |
| 459 | if (val && i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, |
| 460 | almon | M41T80_ALMON_SQWE) < 0) |
| 461 | return -EIO; |
| 462 | return count; |
| 463 | } |
| 464 | static DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR, |
| 465 | m41t80_sysfs_show_sqwfreq, m41t80_sysfs_set_sqwfreq); |
| 466 | |
| 467 | static struct attribute *attrs[] = { |
| 468 | &dev_attr_flags.attr, |
| 469 | &dev_attr_sqwfreq.attr, |
| 470 | NULL, |
| 471 | }; |
| 472 | static struct attribute_group attr_group = { |
| 473 | .attrs = attrs, |
| 474 | }; |
| 475 | |
| 476 | static int m41t80_sysfs_register(struct device *dev) |
| 477 | { |
| 478 | return sysfs_create_group(&dev->kobj, &attr_group); |
| 479 | } |
| 480 | #else |
| 481 | static int m41t80_sysfs_register(struct device *dev) |
| 482 | { |
| 483 | return 0; |
| 484 | } |
| 485 | #endif |
| 486 | |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 487 | #ifdef CONFIG_RTC_DRV_M41T80_WDT |
| 488 | /* |
| 489 | ***************************************************************************** |
| 490 | * |
| 491 | * Watchdog Driver |
| 492 | * |
| 493 | ***************************************************************************** |
| 494 | */ |
| 495 | static struct i2c_client *save_client; |
| 496 | |
| 497 | /* Default margin */ |
| 498 | #define WD_TIMO 60 /* 1..31 seconds */ |
| 499 | |
| 500 | static int wdt_margin = WD_TIMO; |
| 501 | module_param(wdt_margin, int, 0); |
| 502 | MODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 60s)"); |
| 503 | |
| 504 | static unsigned long wdt_is_open; |
| 505 | static int boot_flag; |
| 506 | |
| 507 | /** |
| 508 | * wdt_ping: |
| 509 | * |
| 510 | * Reload counter one with the watchdog timeout. We don't bother reloading |
| 511 | * the cascade counter. |
| 512 | */ |
| 513 | static void wdt_ping(void) |
| 514 | { |
| 515 | unsigned char i2c_data[2]; |
| 516 | struct i2c_msg msgs1[1] = { |
| 517 | { |
| 518 | .addr = save_client->addr, |
| 519 | .flags = 0, |
| 520 | .len = 2, |
| 521 | .buf = i2c_data, |
| 522 | }, |
| 523 | }; |
Steven A. Falco | d3a126f | 2008-10-15 22:03:07 -0700 | [diff] [blame] | 524 | struct m41t80_data *clientdata = i2c_get_clientdata(save_client); |
| 525 | |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 526 | i2c_data[0] = 0x09; /* watchdog register */ |
| 527 | |
| 528 | if (wdt_margin > 31) |
| 529 | i2c_data[1] = (wdt_margin & 0xFC) | 0x83; /* resolution = 4s */ |
| 530 | else |
| 531 | /* |
| 532 | * WDS = 1 (0x80), mulitplier = WD_TIMO, resolution = 1s (0x02) |
| 533 | */ |
| 534 | i2c_data[1] = wdt_margin<<2 | 0x82; |
| 535 | |
Steven A. Falco | d3a126f | 2008-10-15 22:03:07 -0700 | [diff] [blame] | 536 | /* |
| 537 | * M41T65 has three bits for watchdog resolution. Don't set bit 7, as |
| 538 | * that would be an invalid resolution. |
| 539 | */ |
| 540 | if (clientdata->features & M41T80_FEATURE_WD) |
| 541 | i2c_data[1] &= ~M41T80_WATCHDOG_RB2; |
| 542 | |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 543 | i2c_transfer(save_client->adapter, msgs1, 1); |
| 544 | } |
| 545 | |
| 546 | /** |
| 547 | * wdt_disable: |
| 548 | * |
| 549 | * disables watchdog. |
| 550 | */ |
| 551 | static void wdt_disable(void) |
| 552 | { |
| 553 | unsigned char i2c_data[2], i2c_buf[0x10]; |
| 554 | struct i2c_msg msgs0[2] = { |
| 555 | { |
| 556 | .addr = save_client->addr, |
| 557 | .flags = 0, |
| 558 | .len = 1, |
| 559 | .buf = i2c_data, |
| 560 | }, |
| 561 | { |
| 562 | .addr = save_client->addr, |
| 563 | .flags = I2C_M_RD, |
| 564 | .len = 1, |
| 565 | .buf = i2c_buf, |
| 566 | }, |
| 567 | }; |
| 568 | struct i2c_msg msgs1[1] = { |
| 569 | { |
| 570 | .addr = save_client->addr, |
| 571 | .flags = 0, |
| 572 | .len = 2, |
| 573 | .buf = i2c_data, |
| 574 | }, |
| 575 | }; |
| 576 | |
| 577 | i2c_data[0] = 0x09; |
| 578 | i2c_transfer(save_client->adapter, msgs0, 2); |
| 579 | |
| 580 | i2c_data[0] = 0x09; |
| 581 | i2c_data[1] = 0x00; |
| 582 | i2c_transfer(save_client->adapter, msgs1, 1); |
| 583 | } |
| 584 | |
| 585 | /** |
| 586 | * wdt_write: |
| 587 | * @file: file handle to the watchdog |
| 588 | * @buf: buffer to write (unused as data does not matter here |
| 589 | * @count: count of bytes |
| 590 | * @ppos: pointer to the position to write. No seeks allowed |
| 591 | * |
| 592 | * A write to a watchdog device is defined as a keepalive signal. Any |
| 593 | * write of data will do, as we we don't define content meaning. |
| 594 | */ |
| 595 | static ssize_t wdt_write(struct file *file, const char __user *buf, |
| 596 | size_t count, loff_t *ppos) |
| 597 | { |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 598 | if (count) { |
| 599 | wdt_ping(); |
| 600 | return 1; |
| 601 | } |
| 602 | return 0; |
| 603 | } |
| 604 | |
| 605 | static ssize_t wdt_read(struct file *file, char __user *buf, |
| 606 | size_t count, loff_t *ppos) |
| 607 | { |
| 608 | return 0; |
| 609 | } |
| 610 | |
| 611 | /** |
| 612 | * wdt_ioctl: |
| 613 | * @inode: inode of the device |
| 614 | * @file: file handle to the device |
| 615 | * @cmd: watchdog command |
| 616 | * @arg: argument pointer |
| 617 | * |
| 618 | * The watchdog API defines a common set of functions for all watchdogs |
| 619 | * according to their available features. We only actually usefully support |
| 620 | * querying capabilities and current status. |
| 621 | */ |
Arnd Bergmann | 5592933 | 2010-04-27 00:24:05 +0200 | [diff] [blame] | 622 | static int wdt_ioctl(struct file *file, unsigned int cmd, |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 623 | unsigned long arg) |
| 624 | { |
| 625 | int new_margin, rv; |
| 626 | static struct watchdog_info ident = { |
| 627 | .options = WDIOF_POWERUNDER | WDIOF_KEEPALIVEPING | |
| 628 | WDIOF_SETTIMEOUT, |
| 629 | .firmware_version = 1, |
| 630 | .identity = "M41T80 WTD" |
| 631 | }; |
| 632 | |
| 633 | switch (cmd) { |
| 634 | case WDIOC_GETSUPPORT: |
| 635 | return copy_to_user((struct watchdog_info __user *)arg, &ident, |
| 636 | sizeof(ident)) ? -EFAULT : 0; |
| 637 | |
| 638 | case WDIOC_GETSTATUS: |
| 639 | case WDIOC_GETBOOTSTATUS: |
| 640 | return put_user(boot_flag, (int __user *)arg); |
| 641 | case WDIOC_KEEPALIVE: |
| 642 | wdt_ping(); |
| 643 | return 0; |
| 644 | case WDIOC_SETTIMEOUT: |
| 645 | if (get_user(new_margin, (int __user *)arg)) |
| 646 | return -EFAULT; |
| 647 | /* Arbitrary, can't find the card's limits */ |
| 648 | if (new_margin < 1 || new_margin > 124) |
| 649 | return -EINVAL; |
| 650 | wdt_margin = new_margin; |
| 651 | wdt_ping(); |
| 652 | /* Fall */ |
| 653 | case WDIOC_GETTIMEOUT: |
| 654 | return put_user(wdt_margin, (int __user *)arg); |
| 655 | |
| 656 | case WDIOC_SETOPTIONS: |
| 657 | if (copy_from_user(&rv, (int __user *)arg, sizeof(int))) |
| 658 | return -EFAULT; |
| 659 | |
| 660 | if (rv & WDIOS_DISABLECARD) { |
Maciej W. Rozycki | 4c228db | 2008-07-23 21:30:32 -0700 | [diff] [blame] | 661 | pr_info("rtc-m41t80: disable watchdog\n"); |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 662 | wdt_disable(); |
| 663 | } |
| 664 | |
| 665 | if (rv & WDIOS_ENABLECARD) { |
Maciej W. Rozycki | 4c228db | 2008-07-23 21:30:32 -0700 | [diff] [blame] | 666 | pr_info("rtc-m41t80: enable watchdog\n"); |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 667 | wdt_ping(); |
| 668 | } |
| 669 | |
| 670 | return -EINVAL; |
| 671 | } |
| 672 | return -ENOTTY; |
| 673 | } |
| 674 | |
Arnd Bergmann | 5592933 | 2010-04-27 00:24:05 +0200 | [diff] [blame] | 675 | static long wdt_unlocked_ioctl(struct file *file, unsigned int cmd, |
| 676 | unsigned long arg) |
| 677 | { |
| 678 | int ret; |
| 679 | |
| 680 | lock_kernel(); |
| 681 | ret = wdt_ioctl(file, cmd, arg); |
| 682 | unlock_kernel(); |
| 683 | |
| 684 | return ret; |
| 685 | } |
| 686 | |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 687 | /** |
| 688 | * wdt_open: |
| 689 | * @inode: inode of device |
| 690 | * @file: file handle to device |
| 691 | * |
| 692 | */ |
| 693 | static int wdt_open(struct inode *inode, struct file *file) |
| 694 | { |
| 695 | if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) { |
Arnd Bergmann | 4101273 | 2008-05-20 19:16:39 +0200 | [diff] [blame] | 696 | lock_kernel(); |
| 697 | if (test_and_set_bit(0, &wdt_is_open)) { |
| 698 | unlock_kernel(); |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 699 | return -EBUSY; |
Arnd Bergmann | 4101273 | 2008-05-20 19:16:39 +0200 | [diff] [blame] | 700 | } |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 701 | /* |
| 702 | * Activate |
| 703 | */ |
| 704 | wdt_is_open = 1; |
Arnd Bergmann | 4101273 | 2008-05-20 19:16:39 +0200 | [diff] [blame] | 705 | unlock_kernel(); |
Jan Blunck | 09eeb1f | 2010-05-26 14:44:47 -0700 | [diff] [blame] | 706 | return nonseekable_open(inode, file); |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 707 | } |
| 708 | return -ENODEV; |
| 709 | } |
| 710 | |
| 711 | /** |
| 712 | * wdt_close: |
| 713 | * @inode: inode to board |
| 714 | * @file: file handle to board |
| 715 | * |
| 716 | */ |
| 717 | static int wdt_release(struct inode *inode, struct file *file) |
| 718 | { |
| 719 | if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) |
| 720 | clear_bit(0, &wdt_is_open); |
| 721 | return 0; |
| 722 | } |
| 723 | |
| 724 | /** |
| 725 | * notify_sys: |
| 726 | * @this: our notifier block |
| 727 | * @code: the event being reported |
| 728 | * @unused: unused |
| 729 | * |
| 730 | * Our notifier is called on system shutdowns. We want to turn the card |
| 731 | * off at reboot otherwise the machine will reboot again during memory |
| 732 | * test or worse yet during the following fsck. This would suck, in fact |
| 733 | * trust me - if it happens it does suck. |
| 734 | */ |
| 735 | static int wdt_notify_sys(struct notifier_block *this, unsigned long code, |
| 736 | void *unused) |
| 737 | { |
| 738 | if (code == SYS_DOWN || code == SYS_HALT) |
| 739 | /* Disable Watchdog */ |
| 740 | wdt_disable(); |
| 741 | return NOTIFY_DONE; |
| 742 | } |
| 743 | |
| 744 | static const struct file_operations wdt_fops = { |
| 745 | .owner = THIS_MODULE, |
| 746 | .read = wdt_read, |
Arnd Bergmann | 5592933 | 2010-04-27 00:24:05 +0200 | [diff] [blame] | 747 | .unlocked_ioctl = wdt_unlocked_ioctl, |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 748 | .write = wdt_write, |
| 749 | .open = wdt_open, |
| 750 | .release = wdt_release, |
| 751 | }; |
| 752 | |
| 753 | static struct miscdevice wdt_dev = { |
| 754 | .minor = WATCHDOG_MINOR, |
| 755 | .name = "watchdog", |
| 756 | .fops = &wdt_fops, |
| 757 | }; |
| 758 | |
| 759 | /* |
| 760 | * The WDT card needs to learn about soft shutdowns in order to |
| 761 | * turn the timebomb registers off. |
| 762 | */ |
| 763 | static struct notifier_block wdt_notifier = { |
| 764 | .notifier_call = wdt_notify_sys, |
| 765 | }; |
| 766 | #endif /* CONFIG_RTC_DRV_M41T80_WDT */ |
| 767 | |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 768 | /* |
| 769 | ***************************************************************************** |
| 770 | * |
| 771 | * Driver Interface |
| 772 | * |
| 773 | ***************************************************************************** |
| 774 | */ |
Jean Delvare | d2653e9 | 2008-04-29 23:11:39 +0200 | [diff] [blame] | 775 | static int m41t80_probe(struct i2c_client *client, |
| 776 | const struct i2c_device_id *id) |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 777 | { |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 778 | int rc = 0; |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 779 | struct rtc_device *rtc = NULL; |
| 780 | struct rtc_time tm; |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 781 | struct m41t80_data *clientdata = NULL; |
| 782 | |
| 783 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
| 784 | | I2C_FUNC_SMBUS_BYTE_DATA)) { |
| 785 | rc = -ENODEV; |
| 786 | goto exit; |
| 787 | } |
| 788 | |
| 789 | dev_info(&client->dev, |
| 790 | "chip found, driver version " DRV_VERSION "\n"); |
| 791 | |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 792 | clientdata = kzalloc(sizeof(*clientdata), GFP_KERNEL); |
| 793 | if (!clientdata) { |
| 794 | rc = -ENOMEM; |
| 795 | goto exit; |
| 796 | } |
| 797 | |
| 798 | rtc = rtc_device_register(client->name, &client->dev, |
| 799 | &m41t80_rtc_ops, THIS_MODULE); |
| 800 | if (IS_ERR(rtc)) { |
| 801 | rc = PTR_ERR(rtc); |
| 802 | rtc = NULL; |
| 803 | goto exit; |
| 804 | } |
| 805 | |
| 806 | clientdata->rtc = rtc; |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 807 | clientdata->features = id->driver_data; |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 808 | i2c_set_clientdata(client, clientdata); |
| 809 | |
| 810 | /* Make sure HT (Halt Update) bit is cleared */ |
| 811 | rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR); |
| 812 | if (rc < 0) |
| 813 | goto ht_err; |
| 814 | |
| 815 | if (rc & M41T80_ALHOUR_HT) { |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 816 | if (clientdata->features & M41T80_FEATURE_HT) { |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 817 | m41t80_get_datetime(client, &tm); |
| 818 | dev_info(&client->dev, "HT bit was set!\n"); |
| 819 | dev_info(&client->dev, |
| 820 | "Power Down at " |
| 821 | "%04i-%02i-%02i %02i:%02i:%02i\n", |
| 822 | tm.tm_year + 1900, |
| 823 | tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, |
| 824 | tm.tm_min, tm.tm_sec); |
| 825 | } |
| 826 | if (i2c_smbus_write_byte_data(client, |
| 827 | M41T80_REG_ALARM_HOUR, |
| 828 | rc & ~M41T80_ALHOUR_HT) < 0) |
| 829 | goto ht_err; |
| 830 | } |
| 831 | |
| 832 | /* Make sure ST (stop) bit is cleared */ |
| 833 | rc = i2c_smbus_read_byte_data(client, M41T80_REG_SEC); |
| 834 | if (rc < 0) |
| 835 | goto st_err; |
| 836 | |
| 837 | if (rc & M41T80_SEC_ST) { |
| 838 | if (i2c_smbus_write_byte_data(client, M41T80_REG_SEC, |
| 839 | rc & ~M41T80_SEC_ST) < 0) |
| 840 | goto st_err; |
| 841 | } |
| 842 | |
| 843 | rc = m41t80_sysfs_register(&client->dev); |
| 844 | if (rc) |
| 845 | goto exit; |
| 846 | |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 847 | #ifdef CONFIG_RTC_DRV_M41T80_WDT |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 848 | if (clientdata->features & M41T80_FEATURE_HT) { |
Maciej W. Rozycki | 417607d | 2008-05-12 14:02:35 -0700 | [diff] [blame] | 849 | save_client = client; |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 850 | rc = misc_register(&wdt_dev); |
| 851 | if (rc) |
| 852 | goto exit; |
| 853 | rc = register_reboot_notifier(&wdt_notifier); |
| 854 | if (rc) { |
| 855 | misc_deregister(&wdt_dev); |
| 856 | goto exit; |
| 857 | } |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 858 | } |
| 859 | #endif |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 860 | return 0; |
| 861 | |
| 862 | st_err: |
| 863 | rc = -EIO; |
| 864 | dev_err(&client->dev, "Can't clear ST bit\n"); |
| 865 | goto exit; |
| 866 | ht_err: |
| 867 | rc = -EIO; |
| 868 | dev_err(&client->dev, "Can't clear HT bit\n"); |
| 869 | goto exit; |
| 870 | |
| 871 | exit: |
| 872 | if (rtc) |
| 873 | rtc_device_unregister(rtc); |
| 874 | kfree(clientdata); |
| 875 | return rc; |
| 876 | } |
| 877 | |
| 878 | static int m41t80_remove(struct i2c_client *client) |
| 879 | { |
| 880 | struct m41t80_data *clientdata = i2c_get_clientdata(client); |
| 881 | struct rtc_device *rtc = clientdata->rtc; |
| 882 | |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 883 | #ifdef CONFIG_RTC_DRV_M41T80_WDT |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 884 | if (clientdata->features & M41T80_FEATURE_HT) { |
Atsushi Nemoto | 617780d | 2007-07-17 04:05:04 -0700 | [diff] [blame] | 885 | misc_deregister(&wdt_dev); |
| 886 | unregister_reboot_notifier(&wdt_notifier); |
| 887 | } |
| 888 | #endif |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 889 | if (rtc) |
| 890 | rtc_device_unregister(rtc); |
| 891 | kfree(clientdata); |
| 892 | |
| 893 | return 0; |
| 894 | } |
| 895 | |
| 896 | static struct i2c_driver m41t80_driver = { |
| 897 | .driver = { |
David Brownell | afe1ab4 | 2007-08-22 14:01:27 -0700 | [diff] [blame] | 898 | .name = "rtc-m41t80", |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 899 | }, |
| 900 | .probe = m41t80_probe, |
| 901 | .remove = m41t80_remove, |
Jean Delvare | 3760f73 | 2008-04-29 23:11:40 +0200 | [diff] [blame] | 902 | .id_table = m41t80_id, |
Atsushi Nemoto | caaff56 | 2007-07-17 04:05:02 -0700 | [diff] [blame] | 903 | }; |
| 904 | |
| 905 | static int __init m41t80_rtc_init(void) |
| 906 | { |
| 907 | return i2c_add_driver(&m41t80_driver); |
| 908 | } |
| 909 | |
| 910 | static void __exit m41t80_rtc_exit(void) |
| 911 | { |
| 912 | i2c_del_driver(&m41t80_driver); |
| 913 | } |
| 914 | |
| 915 | MODULE_AUTHOR("Alexander Bigga <ab@mycable.de>"); |
| 916 | MODULE_DESCRIPTION("ST Microelectronics M41T80 series RTC I2C Client Driver"); |
| 917 | MODULE_LICENSE("GPL"); |
| 918 | MODULE_VERSION(DRV_VERSION); |
| 919 | |
| 920 | module_init(m41t80_rtc_init); |
| 921 | module_exit(m41t80_rtc_exit); |