rtc-m41t80.c revision d2653e92732bd3911feff6bee5e23dbf959381db
1caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto/* 2caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * I2C client/driver for the ST M41T80 family of i2c rtc chips. 3caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * 4caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * Author: Alexander Bigga <ab@mycable.de> 5caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * 6caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * Based on m41t00.c by Mark A. Greer <mgreer@mvista.com> 7caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * 8caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * 2006 (c) mycable GmbH 9caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * 10caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * This program is free software; you can redistribute it and/or modify 11caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * it under the terms of the GNU General Public License version 2 as 12caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * published by the Free Software Foundation. 13caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * 14caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto */ 15caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 16caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#include <linux/module.h> 17caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#include <linux/init.h> 18caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#include <linux/slab.h> 19caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#include <linux/string.h> 20caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#include <linux/i2c.h> 21caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#include <linux/rtc.h> 22caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#include <linux/bcd.h> 23617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 24617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#include <linux/miscdevice.h> 25617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#include <linux/watchdog.h> 26617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#include <linux/reboot.h> 27617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#include <linux/fs.h> 28617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#include <linux/ioctl.h> 29617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif 30caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 31caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_SSEC 0 32caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_SEC 1 33caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_MIN 2 34caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_HOUR 3 35caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_WDAY 4 36caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_DAY 5 37caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_MON 6 38caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_YEAR 7 39caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_ALARM_MON 0xa 40caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_ALARM_DAY 0xb 41caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_ALARM_HOUR 0xc 42caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_ALARM_MIN 0xd 43caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_ALARM_SEC 0xe 44caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_FLAGS 0xf 45caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_SQW 0x13 46caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 47caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_DATETIME_REG_SIZE (M41T80_REG_YEAR + 1) 48caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_ALARM_REG_SIZE \ 49caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto (M41T80_REG_ALARM_SEC + 1 - M41T80_REG_ALARM_MON) 50caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 51caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_SEC_ST (1 << 7) /* ST: Stop Bit */ 52caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_ALMON_AFE (1 << 7) /* AFE: AF Enable Bit */ 53caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_ALMON_SQWE (1 << 6) /* SQWE: SQW Enable Bit */ 54caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */ 55caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_FLAGS_AF (1 << 6) /* AF: Alarm Flag Bit */ 56caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_FLAGS_BATT_LOW (1 << 4) /* BL: Battery Low Bit */ 57caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 58caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_FEATURE_HT (1 << 0) 59caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_FEATURE_BL (1 << 1) 60caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 61caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define DRV_VERSION "0.05" 62caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 63caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostruct m41t80_chip_info { 64caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto const char *name; 65caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 features; 66caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 67caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 68caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic const struct m41t80_chip_info m41t80_chip_info_tbl[] = { 69caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 70caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .name = "m41t80", 71caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .features = 0, 72caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 73caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 74caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .name = "m41t81", 75caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .features = M41T80_FEATURE_HT, 76caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 77caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 78caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .name = "m41t81s", 79caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL, 80caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 81caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 82caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .name = "m41t82", 83caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL, 84caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 85caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 86caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .name = "m41t83", 87caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL, 88caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 89caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 90caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .name = "m41st84", 91caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL, 92caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 93caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 94caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .name = "m41st85", 95caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL, 96caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 97caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 98caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .name = "m41st87", 99caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL, 100caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 101caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 102caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 103caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostruct m41t80_data { 104caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto const struct m41t80_chip_info *chip; 105caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_device *rtc; 106caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 107caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 108caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_get_datetime(struct i2c_client *client, 109caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_time *tm) 110caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 111caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 buf[M41T80_DATETIME_REG_SIZE], dt_addr[1] = { M41T80_REG_SEC }; 112caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs[] = { 113caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 114caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 115caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 116caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1, 117caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = dt_addr, 118caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 119caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 120caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 121caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = I2C_M_RD, 122caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, 123caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = buf + M41T80_REG_SEC, 124caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 125caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 126caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 127caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs, 2) < 0) { 128caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "read error\n"); 129caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 130caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 131caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 132caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_sec = BCD2BIN(buf[M41T80_REG_SEC] & 0x7f); 133caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_min = BCD2BIN(buf[M41T80_REG_MIN] & 0x7f); 134caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_hour = BCD2BIN(buf[M41T80_REG_HOUR] & 0x3f); 135caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_mday = BCD2BIN(buf[M41T80_REG_DAY] & 0x3f); 136caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_wday = buf[M41T80_REG_WDAY] & 0x07; 137caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_mon = BCD2BIN(buf[M41T80_REG_MON] & 0x1f) - 1; 138caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 139caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* assume 20YY not 19YY, and ignore the Century Bit */ 140caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_year = BCD2BIN(buf[M41T80_REG_YEAR]) + 100; 141caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 142caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 143caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 144caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto/* Sets the given date and time to the real time clock. */ 145caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm) 146caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 147caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 wbuf[1 + M41T80_DATETIME_REG_SIZE]; 148caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 *buf = &wbuf[1]; 149caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 dt_addr[1] = { M41T80_REG_SEC }; 150caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs_in[] = { 151caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 152caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 153caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 154caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1, 155caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = dt_addr, 156caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 157caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 158caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 159caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = I2C_M_RD, 160caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, 161caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = buf + M41T80_REG_SEC, 162caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 163caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 164caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs[] = { 165caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 166caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 167caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 168caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1 + M41T80_DATETIME_REG_SIZE, 169caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = wbuf, 170caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 171caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 172caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 173caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Read current reg values into buf[1..7] */ 174caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { 175caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "read error\n"); 176caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 177caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 178caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 179caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto wbuf[0] = 0; /* offset into rtc's regs */ 180caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Merge time-data and register flags into buf[0..7] */ 181caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_SSEC] = 0; 182caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_SEC] = 183caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(tm->tm_sec) | (buf[M41T80_REG_SEC] & ~0x7f); 184caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_MIN] = 185caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(tm->tm_min) | (buf[M41T80_REG_MIN] & ~0x7f); 186caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_HOUR] = 187caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(tm->tm_hour) | (buf[M41T80_REG_HOUR] & ~0x3f) ; 188caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_WDAY] = 189caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto (tm->tm_wday & 0x07) | (buf[M41T80_REG_WDAY] & ~0x07); 190caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_DAY] = 191caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(tm->tm_mday) | (buf[M41T80_REG_DAY] & ~0x3f); 192caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_MON] = 193caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(tm->tm_mon + 1) | (buf[M41T80_REG_MON] & ~0x1f); 194caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* assume 20YY not 19YY */ 195caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_YEAR] = BIN2BCD(tm->tm_year % 100); 196caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 197caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs, 1) != 1) { 198caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "write error\n"); 199caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 200caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 201caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 202caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 203caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 204caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) 205caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_proc(struct device *dev, struct seq_file *seq) 206caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 207caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 208caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct m41t80_data *clientdata = i2c_get_clientdata(client); 209caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 reg; 210caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 211caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (clientdata->chip->features & M41T80_FEATURE_BL) { 212caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); 213caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto seq_printf(seq, "battery\t\t: %s\n", 214caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto (reg & M41T80_FLAGS_BATT_LOW) ? "exhausted" : "ok"); 215caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 216caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 217caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 218caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#else 219caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define m41t80_rtc_proc NULL 220caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#endif 221caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 222caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_read_time(struct device *dev, struct rtc_time *tm) 223caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 224caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return m41t80_get_datetime(to_i2c_client(dev), tm); 225caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 226caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 227caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_set_time(struct device *dev, struct rtc_time *tm) 228caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 229caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return m41t80_set_datetime(to_i2c_client(dev), tm); 230caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 231caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 232caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE) 233caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int 234caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotom41t80_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) 235caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 236caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 237caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int rc; 238caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 239caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto switch (cmd) { 240caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case RTC_AIE_OFF: 241caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case RTC_AIE_ON: 242caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 243caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto default: 244caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -ENOIOCTLCMD; 245caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 246caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 247caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); 248caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc < 0) 249caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto err; 250caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto switch (cmd) { 251caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case RTC_AIE_OFF: 252caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc &= ~M41T80_ALMON_AFE; 253caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 254caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case RTC_AIE_ON: 255caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc |= M41T80_ALMON_AFE; 256caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 257caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 258caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, rc) < 0) 259caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto err; 260caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 261caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotoerr: 262caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 263caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 264caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#else 265caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define m41t80_rtc_ioctl NULL 266caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#endif 267caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 268caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *t) 269caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 270caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 271caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 wbuf[1 + M41T80_ALARM_REG_SIZE]; 272caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 *buf = &wbuf[1]; 273caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 *reg = buf - M41T80_REG_ALARM_MON; 274caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; 275caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs_in[] = { 276caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 277caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 278caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 279caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1, 280caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = dt_addr, 281caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 282caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 283caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 284caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = I2C_M_RD, 285caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = M41T80_ALARM_REG_SIZE, 286caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = buf, 287caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 288caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 289caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs[] = { 290caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 291caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 292caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 293caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1 + M41T80_ALARM_REG_SIZE, 294caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = wbuf, 295caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 296caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 297caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 298caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { 299caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "read error\n"); 300caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 301caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 302caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MON] &= ~(0x1f | M41T80_ALMON_AFE); 303caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_DAY] = 0; 304caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_HOUR] &= ~(0x3f | 0x80); 305caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MIN] = 0; 306caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_SEC] = 0; 307caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 308caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto wbuf[0] = M41T80_REG_ALARM_MON; /* offset into rtc's regs */ 309caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_SEC] |= t->time.tm_sec >= 0 ? 310caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(t->time.tm_sec) : 0x80; 311caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MIN] |= t->time.tm_min >= 0 ? 312caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(t->time.tm_min) : 0x80; 313caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_HOUR] |= t->time.tm_hour >= 0 ? 314caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(t->time.tm_hour) : 0x80; 315caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_DAY] |= t->time.tm_mday >= 0 ? 316caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(t->time.tm_mday) : 0x80; 317caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (t->time.tm_mon >= 0) 318caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MON] |= BIN2BCD(t->time.tm_mon + 1); 319caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto else 320caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_DAY] |= 0x40; 321caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 322caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs, 1) != 1) { 323caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "write error\n"); 324caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 325caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 326caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 327caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (t->enabled) { 328caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MON] |= M41T80_ALMON_AFE; 329caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, 330caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MON]) < 0) { 331caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "write error\n"); 332caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 333caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 334caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 335caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 336caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 337caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 338caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *t) 339caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 340caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 341caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 buf[M41T80_ALARM_REG_SIZE + 1]; /* all alarm regs and flags */ 342caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; 343caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 *reg = buf - M41T80_REG_ALARM_MON; 344caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs[] = { 345caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 346caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 347caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 348caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1, 349caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = dt_addr, 350caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 351caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 352caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 353caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = I2C_M_RD, 354caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = M41T80_ALARM_REG_SIZE + 1, 355caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = buf, 356caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 357caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 358caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 359caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs, 2) < 0) { 360caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "read error\n"); 361caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 362caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 363caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_sec = -1; 364caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_min = -1; 365caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_hour = -1; 366caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_mday = -1; 367caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_mon = -1; 368caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_SEC] & 0x80)) 369caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_sec = BCD2BIN(reg[M41T80_REG_ALARM_SEC] & 0x7f); 370caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_MIN] & 0x80)) 371caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_min = BCD2BIN(reg[M41T80_REG_ALARM_MIN] & 0x7f); 372caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_HOUR] & 0x80)) 373caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_hour = BCD2BIN(reg[M41T80_REG_ALARM_HOUR] & 0x3f); 374caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_DAY] & 0x80)) 375caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_mday = BCD2BIN(reg[M41T80_REG_ALARM_DAY] & 0x3f); 376caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_DAY] & 0x40)) 377caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_mon = BCD2BIN(reg[M41T80_REG_ALARM_MON] & 0x1f) - 1; 378caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_year = -1; 379caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_wday = -1; 380caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_yday = -1; 381caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_isdst = -1; 382caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->enabled = !!(reg[M41T80_REG_ALARM_MON] & M41T80_ALMON_AFE); 383caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->pending = !!(reg[M41T80_REG_FLAGS] & M41T80_FLAGS_AF); 384caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 385caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 386caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 387caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct rtc_class_ops m41t80_rtc_ops = { 388caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .read_time = m41t80_rtc_read_time, 389caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .set_time = m41t80_rtc_set_time, 390caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .read_alarm = m41t80_rtc_read_alarm, 391caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .set_alarm = m41t80_rtc_set_alarm, 392caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .proc = m41t80_rtc_proc, 393caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .ioctl = m41t80_rtc_ioctl, 394caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 395caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 396caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) 397caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_show_flags(struct device *dev, 398caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, char *buf) 399caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 400caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 401caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int val; 402caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 403caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); 404caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val < 0) 405caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 406caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sprintf(buf, "%#x\n", val); 407caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 408caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL); 409caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 410caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev, 411caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, char *buf) 412caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 413caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 414caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int val; 415caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 416caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = i2c_smbus_read_byte_data(client, M41T80_REG_SQW); 417caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val < 0) 418caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 419caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = (val >> 4) & 0xf; 420caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto switch (val) { 421caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case 0: 422caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 423caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case 1: 424caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 32768; 425caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 426caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto default: 427caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 32768 >> val; 428caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 429caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sprintf(buf, "%d\n", val); 430caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 431caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev, 432caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, 433caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto const char *buf, size_t count) 434caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 435caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 436caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int almon, sqw; 437caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int val = simple_strtoul(buf, NULL, 0); 438caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 439caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val) { 440caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!is_power_of_2(val)) 441caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EINVAL; 442caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = ilog2(val); 443caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val == 15) 444caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 1; 445caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto else if (val < 14) 446caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 15 - val; 447caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto else 448caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EINVAL; 449caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 450caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* disable SQW, set SQW frequency & re-enable */ 451caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); 452caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (almon < 0) 453caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 454caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto sqw = i2c_smbus_read_byte_data(client, M41T80_REG_SQW); 455caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (sqw < 0) 456caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 457caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto sqw = (sqw & 0x0f) | (val << 4); 458caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, 459caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto almon & ~M41T80_ALMON_SQWE) < 0 || 460caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto i2c_smbus_write_byte_data(client, M41T80_REG_SQW, sqw) < 0) 461caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 462caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val && i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, 463caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto almon | M41T80_ALMON_SQWE) < 0) 464caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 465caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return count; 466caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 467caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR, 468caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto m41t80_sysfs_show_sqwfreq, m41t80_sysfs_set_sqwfreq); 469caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 470caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct attribute *attrs[] = { 471caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto &dev_attr_flags.attr, 472caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto &dev_attr_sqwfreq.attr, 473caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto NULL, 474caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 475caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct attribute_group attr_group = { 476caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .attrs = attrs, 477caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 478caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 479caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_sysfs_register(struct device *dev) 480caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 481caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sysfs_create_group(&dev->kobj, &attr_group); 482caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 483caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#else 484caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_sysfs_register(struct device *dev) 485caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 486caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 487caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 488caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#endif 489caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 490617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 491617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/* 492617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto ***************************************************************************** 493617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 494617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Watchdog Driver 495617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 496617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto ***************************************************************************** 497617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 498617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic struct i2c_client *save_client; 499617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 500617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/* Default margin */ 501617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#define WD_TIMO 60 /* 1..31 seconds */ 502617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 503617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_margin = WD_TIMO; 504617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotomodule_param(wdt_margin, int, 0); 505617780d290bd6eb2b260928c6acff5b7c6084154Atsushi NemotoMODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 60s)"); 506617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 507617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic unsigned long wdt_is_open; 508617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int boot_flag; 509617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 510617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 511617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_ping: 512617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 513617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Reload counter one with the watchdog timeout. We don't bother reloading 514617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * the cascade counter. 515617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 516617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic void wdt_ping(void) 517617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 518617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned char i2c_data[2]; 519617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs1[1] = { 520617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 521617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 522617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 523617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 2, 524617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 525617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 526617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 527617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; /* watchdog register */ 528617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 529617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (wdt_margin > 31) 530617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = (wdt_margin & 0xFC) | 0x83; /* resolution = 4s */ 531617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto else 532617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* 533617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * WDS = 1 (0x80), mulitplier = WD_TIMO, resolution = 1s (0x02) 534617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 535617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = wdt_margin<<2 | 0x82; 536617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 537617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs1, 1); 538617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 539617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 540617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 541617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_disable: 542617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 543617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * disables watchdog. 544617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 545617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic void wdt_disable(void) 546617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 547617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned char i2c_data[2], i2c_buf[0x10]; 548617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs0[2] = { 549617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 550617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 551617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 552617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 1, 553617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 554617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 555617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 556617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 557617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = I2C_M_RD, 558617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 1, 559617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_buf, 560617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 561617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 562617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs1[1] = { 563617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 564617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 565617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 566617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 2, 567617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 568617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 569617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 570617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 571617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; 572617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs0, 2); 573617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 574617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; 575617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = 0x00; 576617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs1, 1); 577617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 578617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 579617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 580617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_write: 581617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to the watchdog 582617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @buf: buffer to write (unused as data does not matter here 583617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @count: count of bytes 584617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @ppos: pointer to the position to write. No seeks allowed 585617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 586617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * A write to a watchdog device is defined as a keepalive signal. Any 587617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * write of data will do, as we we don't define content meaning. 588617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 589617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic ssize_t wdt_write(struct file *file, const char __user *buf, 590617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto size_t count, loff_t *ppos) 591617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 592617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Can't seek (pwrite) on this device 593617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (ppos != &file->f_pos) 594617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -ESPIPE; 595617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 596617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (count) { 597617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 598617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 1; 599617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 600617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 601617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 602617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 603617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic ssize_t wdt_read(struct file *file, char __user *buf, 604617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto size_t count, loff_t *ppos) 605617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 606617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 607617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 608617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 609617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 610617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_ioctl: 611617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @inode: inode of the device 612617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to the device 613617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @cmd: watchdog command 614617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @arg: argument pointer 615617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 616617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * The watchdog API defines a common set of functions for all watchdogs 617617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * according to their available features. We only actually usefully support 618617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * querying capabilities and current status. 619617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 620617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, 621617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned long arg) 622617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 623617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto int new_margin, rv; 624617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto static struct watchdog_info ident = { 625617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .options = WDIOF_POWERUNDER | WDIOF_KEEPALIVEPING | 626617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto WDIOF_SETTIMEOUT, 627617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .firmware_version = 1, 628617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .identity = "M41T80 WTD" 629617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 630617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 631617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto switch (cmd) { 632617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETSUPPORT: 633617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return copy_to_user((struct watchdog_info __user *)arg, &ident, 634617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto sizeof(ident)) ? -EFAULT : 0; 635617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 636617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETSTATUS: 637617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETBOOTSTATUS: 638617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return put_user(boot_flag, (int __user *)arg); 639617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_KEEPALIVE: 640617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 641617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 642617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_SETTIMEOUT: 643617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (get_user(new_margin, (int __user *)arg)) 644617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EFAULT; 645617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Arbitrary, can't find the card's limits */ 646617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (new_margin < 1 || new_margin > 124) 647617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EINVAL; 648617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_margin = new_margin; 649617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 650617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Fall */ 651617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETTIMEOUT: 652617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return put_user(wdt_margin, (int __user *)arg); 653617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 654617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_SETOPTIONS: 655617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (copy_from_user(&rv, (int __user *)arg, sizeof(int))) 656617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EFAULT; 657617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 658617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rv & WDIOS_DISABLECARD) { 659617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto printk(KERN_INFO 660617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto "rtc-m41t80: disable watchdog\n"); 661617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_disable(); 662617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 663617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 664617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rv & WDIOS_ENABLECARD) { 665617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto printk(KERN_INFO 666617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto "rtc-m41t80: enable watchdog\n"); 667617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 668617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 669617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 670617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EINVAL; 671617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 672617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -ENOTTY; 673617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 674617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 675617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 676617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_open: 677617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @inode: inode of device 678617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to device 679617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 680617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 681617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_open(struct inode *inode, struct file *file) 682617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 683617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) { 684617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (test_and_set_bit(0, &wdt_is_open)) 685617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EBUSY; 686617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* 687617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Activate 688617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 689617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_is_open = 1; 690617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 691617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 692617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -ENODEV; 693617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 694617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 695617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 696617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_close: 697617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @inode: inode to board 698617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to board 699617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 700617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 701617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_release(struct inode *inode, struct file *file) 702617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 703617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) 704617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto clear_bit(0, &wdt_is_open); 705617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 706617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 707617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 708617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 709617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * notify_sys: 710617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @this: our notifier block 711617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @code: the event being reported 712617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @unused: unused 713617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 714617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Our notifier is called on system shutdowns. We want to turn the card 715617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * off at reboot otherwise the machine will reboot again during memory 716617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * test or worse yet during the following fsck. This would suck, in fact 717617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * trust me - if it happens it does suck. 718617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 719617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_notify_sys(struct notifier_block *this, unsigned long code, 720617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto void *unused) 721617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 722617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (code == SYS_DOWN || code == SYS_HALT) 723617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Disable Watchdog */ 724617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_disable(); 725617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return NOTIFY_DONE; 726617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 727617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 728617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic const struct file_operations wdt_fops = { 729617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .owner = THIS_MODULE, 730617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .read = wdt_read, 731617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .ioctl = wdt_ioctl, 732617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .write = wdt_write, 733617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .open = wdt_open, 734617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .release = wdt_release, 735617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto}; 736617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 737617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic struct miscdevice wdt_dev = { 738617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .minor = WATCHDOG_MINOR, 739617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .name = "watchdog", 740617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .fops = &wdt_fops, 741617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto}; 742617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 743617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/* 744617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * The WDT card needs to learn about soft shutdowns in order to 745617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * turn the timebomb registers off. 746617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 747617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic struct notifier_block wdt_notifier = { 748617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .notifier_call = wdt_notify_sys, 749617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto}; 750617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif /* CONFIG_RTC_DRV_M41T80_WDT */ 751617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 752caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto/* 753caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto ***************************************************************************** 754caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * 755caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * Driver Interface 756caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * 757caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto ***************************************************************************** 758caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto */ 759d2653e92732bd3911feff6bee5e23dbf959381dbJean Delvarestatic int m41t80_probe(struct i2c_client *client, 760d2653e92732bd3911feff6bee5e23dbf959381dbJean Delvare const struct i2c_device_id *id) 761caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 762caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int i, rc = 0; 763caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_device *rtc = NULL; 764caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_time tm; 765caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto const struct m41t80_chip_info *chip; 766caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct m41t80_data *clientdata = NULL; 767caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 768caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C 769caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto | I2C_FUNC_SMBUS_BYTE_DATA)) { 770caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -ENODEV; 771caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 772caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 773caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 774caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_info(&client->dev, 775caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto "chip found, driver version " DRV_VERSION "\n"); 776caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 777caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto chip = NULL; 778caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto for (i = 0; i < ARRAY_SIZE(m41t80_chip_info_tbl); i++) { 779caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!strcmp(m41t80_chip_info_tbl[i].name, client->name)) { 780caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto chip = &m41t80_chip_info_tbl[i]; 781caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 782caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 783caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 784caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!chip) { 785caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "%s is not supported\n", client->name); 786caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -ENODEV; 787caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 788caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 789caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 790caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto clientdata = kzalloc(sizeof(*clientdata), GFP_KERNEL); 791caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!clientdata) { 792caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -ENOMEM; 793caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 794caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 795caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 796caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rtc = rtc_device_register(client->name, &client->dev, 797caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto &m41t80_rtc_ops, THIS_MODULE); 798caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (IS_ERR(rtc)) { 799caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = PTR_ERR(rtc); 800caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rtc = NULL; 801caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 802caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 803caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 804caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto clientdata->rtc = rtc; 805caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto clientdata->chip = chip; 806caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto i2c_set_clientdata(client, clientdata); 807caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 808caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Make sure HT (Halt Update) bit is cleared */ 809caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR); 810caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc < 0) 811caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto ht_err; 812caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 813caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc & M41T80_ALHOUR_HT) { 814caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (chip->features & M41T80_FEATURE_HT) { 815caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto m41t80_get_datetime(client, &tm); 816caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_info(&client->dev, "HT bit was set!\n"); 817caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_info(&client->dev, 818caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto "Power Down at " 819caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto "%04i-%02i-%02i %02i:%02i:%02i\n", 820caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_year + 1900, 821caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, 822caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_min, tm.tm_sec); 823caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 824caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, 825caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto M41T80_REG_ALARM_HOUR, 826caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc & ~M41T80_ALHOUR_HT) < 0) 827caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto ht_err; 828caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 829caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 830caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Make sure ST (stop) bit is cleared */ 831caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = i2c_smbus_read_byte_data(client, M41T80_REG_SEC); 832caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc < 0) 833caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto st_err; 834caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 835caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc & M41T80_SEC_ST) { 836caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, M41T80_REG_SEC, 837caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc & ~M41T80_SEC_ST) < 0) 838caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto st_err; 839caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 840caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 841caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = m41t80_sysfs_register(&client->dev); 842caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc) 843caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 844caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 845617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 846617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (chip->features & M41T80_FEATURE_HT) { 847617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto rc = misc_register(&wdt_dev); 848617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rc) 849617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto goto exit; 850617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto rc = register_reboot_notifier(&wdt_notifier); 851617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rc) { 852617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto misc_deregister(&wdt_dev); 853617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto goto exit; 854617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 855617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto save_client = client; 856617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 857617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif 858caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 859caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 860caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotost_err: 861caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -EIO; 862caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "Can't clear ST bit\n"); 863caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 864caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotoht_err: 865caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -EIO; 866caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "Can't clear HT bit\n"); 867caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 868caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 869caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotoexit: 870caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rtc) 871caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rtc_device_unregister(rtc); 872caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto kfree(clientdata); 873caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return rc; 874caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 875caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 876caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_remove(struct i2c_client *client) 877caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 878caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct m41t80_data *clientdata = i2c_get_clientdata(client); 879caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_device *rtc = clientdata->rtc; 880caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 881617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 882617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (clientdata->chip->features & M41T80_FEATURE_HT) { 883617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto misc_deregister(&wdt_dev); 884617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unregister_reboot_notifier(&wdt_notifier); 885617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 886617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif 887caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rtc) 888caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rtc_device_unregister(rtc); 889caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto kfree(clientdata); 890caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 891caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 892caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 893caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 894caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct i2c_driver m41t80_driver = { 895caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .driver = { 896afe1ab4d577892822de2c8e803fbfaed6ec44ba3David Brownell .name = "rtc-m41t80", 897caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 898caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .probe = m41t80_probe, 899caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .remove = m41t80_remove, 900caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 901caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 902caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int __init m41t80_rtc_init(void) 903caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 904caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return i2c_add_driver(&m41t80_driver); 905caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 906caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 907caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic void __exit m41t80_rtc_exit(void) 908caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 909caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto i2c_del_driver(&m41t80_driver); 910caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 911caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 912caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_AUTHOR("Alexander Bigga <ab@mycable.de>"); 913caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_DESCRIPTION("ST Microelectronics M41T80 series RTC I2C Client Driver"); 914caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_LICENSE("GPL"); 915caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_VERSION(DRV_VERSION); 916caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 917caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotomodule_init(m41t80_rtc_init); 918caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotomodule_exit(m41t80_rtc_exit); 919