rtc-m41t80.c revision d3a126fcf9df7dc59f1cc553c2fb2e668264e86c
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 1635aa64f3a117a16c466f688f52ac3847b3b572e8Maciej W. Rozycki#include <linux/bcd.h> 1735aa64f3a117a16c466f688f52ac3847b3b572e8Maciej W. Rozycki#include <linux/i2c.h> 18caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#include <linux/init.h> 199fb1f68d40d9dd99fdbf65349c9c6af760e19e6eMaciej W. Rozycki#include <linux/kernel.h> 2035aa64f3a117a16c466f688f52ac3847b3b572e8Maciej W. Rozycki#include <linux/module.h> 2135aa64f3a117a16c466f688f52ac3847b3b572e8Maciej W. Rozycki#include <linux/rtc.h> 22caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#include <linux/slab.h> 2341012735352e72b8a3f95521817dcad1b2986636Arnd Bergmann#include <linux/smp_lock.h> 24caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#include <linux/string.h> 25617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 26617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#include <linux/fs.h> 27617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#include <linux/ioctl.h> 2835aa64f3a117a16c466f688f52ac3847b3b572e8Maciej W. Rozycki#include <linux/miscdevice.h> 2935aa64f3a117a16c466f688f52ac3847b3b572e8Maciej W. Rozycki#include <linux/reboot.h> 3035aa64f3a117a16c466f688f52ac3847b3b572e8Maciej W. Rozycki#include <linux/watchdog.h> 31617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif 32caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 33caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_SSEC 0 34caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_SEC 1 35caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_MIN 2 36caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_HOUR 3 37caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_WDAY 4 38caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_DAY 5 39caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_MON 6 40caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_YEAR 7 41caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_ALARM_MON 0xa 42caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_ALARM_DAY 0xb 43caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_ALARM_HOUR 0xc 44caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_ALARM_MIN 0xd 45caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_ALARM_SEC 0xe 46caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_FLAGS 0xf 47caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_REG_SQW 0x13 48caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 49caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_DATETIME_REG_SIZE (M41T80_REG_YEAR + 1) 50caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_ALARM_REG_SIZE \ 51caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto (M41T80_REG_ALARM_SEC + 1 - M41T80_REG_ALARM_MON) 52caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 53caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_SEC_ST (1 << 7) /* ST: Stop Bit */ 54caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_ALMON_AFE (1 << 7) /* AFE: AF Enable Bit */ 55caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_ALMON_SQWE (1 << 6) /* SQWE: SQW Enable Bit */ 56caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */ 57caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_FLAGS_AF (1 << 6) /* AF: Alarm Flag Bit */ 58caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define M41T80_FLAGS_BATT_LOW (1 << 4) /* BL: Battery Low Bit */ 59d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco#define M41T80_WATCHDOG_RB2 (1 << 7) /* RB: Watchdog resolution */ 60d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco#define M41T80_WATCHDOG_RB1 (1 << 1) /* RB: Watchdog resolution */ 61d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco#define M41T80_WATCHDOG_RB0 (1 << 0) /* RB: Watchdog resolution */ 62caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 63d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco#define M41T80_FEATURE_HT (1 << 0) /* Halt feature */ 64d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco#define M41T80_FEATURE_BL (1 << 1) /* Battery low indicator */ 65d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco#define M41T80_FEATURE_SQ (1 << 2) /* Squarewave feature */ 66d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco#define M41T80_FEATURE_WD (1 << 3) /* Extra watchdog resolution */ 67caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 68caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define DRV_VERSION "0.05" 69caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 703760f736716f74bdc62a4ba5406934338da93eb2Jean Delvarestatic const struct i2c_device_id m41t80_id[] = { 71d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t65", M41T80_FEATURE_HT | M41T80_FEATURE_WD }, 72d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t80", M41T80_FEATURE_SQ }, 73d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t81", M41T80_FEATURE_HT | M41T80_FEATURE_SQ}, 74d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t81s", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 75d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t82", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 76d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t83", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 77d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41st84", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 78d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41st85", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 79d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41st87", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 803760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare { } 81caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 823760f736716f74bdc62a4ba5406934338da93eb2Jean DelvareMODULE_DEVICE_TABLE(i2c, m41t80_id); 83caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 84caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostruct m41t80_data { 853760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare u8 features; 86caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_device *rtc; 87caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 88caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 89caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_get_datetime(struct i2c_client *client, 90caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_time *tm) 91caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 92caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 buf[M41T80_DATETIME_REG_SIZE], dt_addr[1] = { M41T80_REG_SEC }; 93caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs[] = { 94caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 95caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 96caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 97caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1, 98caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = dt_addr, 99caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 100caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 101caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 102caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = I2C_M_RD, 103caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, 104caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = buf + M41T80_REG_SEC, 105caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 106caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 107caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 108caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs, 2) < 0) { 109caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "read error\n"); 110caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 111caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 112caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 113caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_sec = BCD2BIN(buf[M41T80_REG_SEC] & 0x7f); 114caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_min = BCD2BIN(buf[M41T80_REG_MIN] & 0x7f); 115caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_hour = BCD2BIN(buf[M41T80_REG_HOUR] & 0x3f); 116caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_mday = BCD2BIN(buf[M41T80_REG_DAY] & 0x3f); 117caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_wday = buf[M41T80_REG_WDAY] & 0x07; 118caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_mon = BCD2BIN(buf[M41T80_REG_MON] & 0x1f) - 1; 119caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 120caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* assume 20YY not 19YY, and ignore the Century Bit */ 121caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_year = BCD2BIN(buf[M41T80_REG_YEAR]) + 100; 122caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 123caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 124caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 125caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto/* Sets the given date and time to the real time clock. */ 126caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm) 127caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 128caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 wbuf[1 + M41T80_DATETIME_REG_SIZE]; 129caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 *buf = &wbuf[1]; 130caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 dt_addr[1] = { M41T80_REG_SEC }; 131caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs_in[] = { 132caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 133caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 134caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 135caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1, 136caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = dt_addr, 137caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 138caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 139caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 140caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = I2C_M_RD, 141caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, 142caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = buf + M41T80_REG_SEC, 143caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 144caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 145caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs[] = { 146caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 147caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 148caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 149caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1 + M41T80_DATETIME_REG_SIZE, 150caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = wbuf, 151caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 152caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 153caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 154caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Read current reg values into buf[1..7] */ 155caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { 156caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "read error\n"); 157caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 158caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 159caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 160caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto wbuf[0] = 0; /* offset into rtc's regs */ 161caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Merge time-data and register flags into buf[0..7] */ 162caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_SSEC] = 0; 163caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_SEC] = 164caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(tm->tm_sec) | (buf[M41T80_REG_SEC] & ~0x7f); 165caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_MIN] = 166caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(tm->tm_min) | (buf[M41T80_REG_MIN] & ~0x7f); 167caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_HOUR] = 168caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(tm->tm_hour) | (buf[M41T80_REG_HOUR] & ~0x3f) ; 169caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_WDAY] = 170caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto (tm->tm_wday & 0x07) | (buf[M41T80_REG_WDAY] & ~0x07); 171caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_DAY] = 172caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(tm->tm_mday) | (buf[M41T80_REG_DAY] & ~0x3f); 173caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_MON] = 174caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(tm->tm_mon + 1) | (buf[M41T80_REG_MON] & ~0x1f); 175caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* assume 20YY not 19YY */ 176caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_YEAR] = BIN2BCD(tm->tm_year % 100); 177caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 178caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs, 1) != 1) { 179caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "write error\n"); 180caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 181caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 182caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 183caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 184caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 185caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) 186caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_proc(struct device *dev, struct seq_file *seq) 187caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 188caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 189caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct m41t80_data *clientdata = i2c_get_clientdata(client); 190caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 reg; 191caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 1923760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_BL) { 193caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); 194caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto seq_printf(seq, "battery\t\t: %s\n", 195caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto (reg & M41T80_FLAGS_BATT_LOW) ? "exhausted" : "ok"); 196caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 197caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 198caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 199caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#else 200caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define m41t80_rtc_proc NULL 201caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#endif 202caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 203caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_read_time(struct device *dev, struct rtc_time *tm) 204caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 205caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return m41t80_get_datetime(to_i2c_client(dev), tm); 206caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 207caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 208caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_set_time(struct device *dev, struct rtc_time *tm) 209caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 210caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return m41t80_set_datetime(to_i2c_client(dev), tm); 211caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 212caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 213caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE) 214caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int 215caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotom41t80_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) 216caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 217caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 218caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int rc; 219caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 220caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto switch (cmd) { 221caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case RTC_AIE_OFF: 222caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case RTC_AIE_ON: 223caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 224caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto default: 225caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -ENOIOCTLCMD; 226caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 227caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 228caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); 229caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc < 0) 230caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto err; 231caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto switch (cmd) { 232caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case RTC_AIE_OFF: 233caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc &= ~M41T80_ALMON_AFE; 234caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 235caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case RTC_AIE_ON: 236caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc |= M41T80_ALMON_AFE; 237caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 238caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 239caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, rc) < 0) 240caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto err; 241caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 242caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotoerr: 243caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 244caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 245caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#else 246caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define m41t80_rtc_ioctl NULL 247caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#endif 248caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 249caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *t) 250caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 251caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 252caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 wbuf[1 + M41T80_ALARM_REG_SIZE]; 253caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 *buf = &wbuf[1]; 254caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 *reg = buf - M41T80_REG_ALARM_MON; 255caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; 256caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs_in[] = { 257caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 258caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 259caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 260caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1, 261caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = dt_addr, 262caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 263caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 264caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 265caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = I2C_M_RD, 266caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = M41T80_ALARM_REG_SIZE, 267caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = buf, 268caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 269caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 270caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs[] = { 271caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 272caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 273caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 274caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1 + M41T80_ALARM_REG_SIZE, 275caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = wbuf, 276caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 277caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 278caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 279caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { 280caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "read error\n"); 281caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 282caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 283caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MON] &= ~(0x1f | M41T80_ALMON_AFE); 284caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_DAY] = 0; 285caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_HOUR] &= ~(0x3f | 0x80); 286caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MIN] = 0; 287caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_SEC] = 0; 288caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 289caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto wbuf[0] = M41T80_REG_ALARM_MON; /* offset into rtc's regs */ 290caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_SEC] |= t->time.tm_sec >= 0 ? 291caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(t->time.tm_sec) : 0x80; 292caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MIN] |= t->time.tm_min >= 0 ? 293caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(t->time.tm_min) : 0x80; 294caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_HOUR] |= t->time.tm_hour >= 0 ? 295caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(t->time.tm_hour) : 0x80; 296caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_DAY] |= t->time.tm_mday >= 0 ? 297caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto BIN2BCD(t->time.tm_mday) : 0x80; 298caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (t->time.tm_mon >= 0) 299caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MON] |= BIN2BCD(t->time.tm_mon + 1); 300caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto else 301caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_DAY] |= 0x40; 302caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 303caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs, 1) != 1) { 304caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "write error\n"); 305caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 306caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 307caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 308caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (t->enabled) { 309caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MON] |= M41T80_ALMON_AFE; 310caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, 311caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MON]) < 0) { 312caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "write error\n"); 313caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 314caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 315caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 316caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 317caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 318caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 319caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *t) 320caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 321caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 322caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 buf[M41T80_ALARM_REG_SIZE + 1]; /* all alarm regs and flags */ 323caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; 324caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 *reg = buf - M41T80_REG_ALARM_MON; 325caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs[] = { 326caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 327caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 328caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 329caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1, 330caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = dt_addr, 331caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 332caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 333caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 334caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = I2C_M_RD, 335caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = M41T80_ALARM_REG_SIZE + 1, 336caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = buf, 337caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 338caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 339caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 340caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs, 2) < 0) { 341caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "read error\n"); 342caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 343caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 344caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_sec = -1; 345caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_min = -1; 346caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_hour = -1; 347caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_mday = -1; 348caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_mon = -1; 349caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_SEC] & 0x80)) 350caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_sec = BCD2BIN(reg[M41T80_REG_ALARM_SEC] & 0x7f); 351caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_MIN] & 0x80)) 352caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_min = BCD2BIN(reg[M41T80_REG_ALARM_MIN] & 0x7f); 353caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_HOUR] & 0x80)) 354caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_hour = BCD2BIN(reg[M41T80_REG_ALARM_HOUR] & 0x3f); 355caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_DAY] & 0x80)) 356caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_mday = BCD2BIN(reg[M41T80_REG_ALARM_DAY] & 0x3f); 357caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_DAY] & 0x40)) 358caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_mon = BCD2BIN(reg[M41T80_REG_ALARM_MON] & 0x1f) - 1; 359caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_year = -1; 360caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_wday = -1; 361caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_yday = -1; 362caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_isdst = -1; 363caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->enabled = !!(reg[M41T80_REG_ALARM_MON] & M41T80_ALMON_AFE); 364caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->pending = !!(reg[M41T80_REG_FLAGS] & M41T80_FLAGS_AF); 365caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 366caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 367caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 368caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct rtc_class_ops m41t80_rtc_ops = { 369caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .read_time = m41t80_rtc_read_time, 370caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .set_time = m41t80_rtc_set_time, 371caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .read_alarm = m41t80_rtc_read_alarm, 372caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .set_alarm = m41t80_rtc_set_alarm, 373caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .proc = m41t80_rtc_proc, 374caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .ioctl = m41t80_rtc_ioctl, 375caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 376caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 377caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) 378caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_show_flags(struct device *dev, 379caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, char *buf) 380caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 381caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 382caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int val; 383caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 384caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); 385caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val < 0) 386caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 387caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sprintf(buf, "%#x\n", val); 388caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 389caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL); 390caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 391caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev, 392caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, char *buf) 393caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 394caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 395d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco struct m41t80_data *clientdata = i2c_get_clientdata(client); 396caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int val; 397caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 398d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco if (!(clientdata->features & M41T80_FEATURE_SQ)) 399d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco return -EINVAL; 400d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 401caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = i2c_smbus_read_byte_data(client, M41T80_REG_SQW); 402caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val < 0) 403caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 404caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = (val >> 4) & 0xf; 405caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto switch (val) { 406caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case 0: 407caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 408caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case 1: 409caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 32768; 410caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 411caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto default: 412caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 32768 >> val; 413caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 414caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sprintf(buf, "%d\n", val); 415caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 416caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev, 417caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, 418caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto const char *buf, size_t count) 419caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 420caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 421d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco struct m41t80_data *clientdata = i2c_get_clientdata(client); 422caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int almon, sqw; 423caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int val = simple_strtoul(buf, NULL, 0); 424caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 425d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco if (!(clientdata->features & M41T80_FEATURE_SQ)) 426d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco return -EINVAL; 427d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 428caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val) { 429caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!is_power_of_2(val)) 430caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EINVAL; 431caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = ilog2(val); 432caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val == 15) 433caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 1; 434caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto else if (val < 14) 435caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 15 - val; 436caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto else 437caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EINVAL; 438caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 439caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* disable SQW, set SQW frequency & re-enable */ 440caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); 441caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (almon < 0) 442caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 443caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto sqw = i2c_smbus_read_byte_data(client, M41T80_REG_SQW); 444caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (sqw < 0) 445caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 446caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto sqw = (sqw & 0x0f) | (val << 4); 447caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, 448caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto almon & ~M41T80_ALMON_SQWE) < 0 || 449caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto i2c_smbus_write_byte_data(client, M41T80_REG_SQW, sqw) < 0) 450caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 451caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val && i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, 452caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto almon | M41T80_ALMON_SQWE) < 0) 453caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 454caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return count; 455caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 456caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR, 457caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto m41t80_sysfs_show_sqwfreq, m41t80_sysfs_set_sqwfreq); 458caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 459caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct attribute *attrs[] = { 460caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto &dev_attr_flags.attr, 461caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto &dev_attr_sqwfreq.attr, 462caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto NULL, 463caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 464caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct attribute_group attr_group = { 465caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .attrs = attrs, 466caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 467caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 468caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_sysfs_register(struct device *dev) 469caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 470caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sysfs_create_group(&dev->kobj, &attr_group); 471caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 472caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#else 473caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_sysfs_register(struct device *dev) 474caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 475caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 476caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 477caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#endif 478caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 479617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 480617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/* 481617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto ***************************************************************************** 482617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 483617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Watchdog Driver 484617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 485617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto ***************************************************************************** 486617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 487617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic struct i2c_client *save_client; 488617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 489617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/* Default margin */ 490617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#define WD_TIMO 60 /* 1..31 seconds */ 491617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 492617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_margin = WD_TIMO; 493617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotomodule_param(wdt_margin, int, 0); 494617780d290bd6eb2b260928c6acff5b7c6084154Atsushi NemotoMODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 60s)"); 495617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 496617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic unsigned long wdt_is_open; 497617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int boot_flag; 498617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 499617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 500617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_ping: 501617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 502617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Reload counter one with the watchdog timeout. We don't bother reloading 503617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * the cascade counter. 504617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 505617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic void wdt_ping(void) 506617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 507617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned char i2c_data[2]; 508617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs1[1] = { 509617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 510617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 511617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 512617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 2, 513617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 514617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 515617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 516d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco struct m41t80_data *clientdata = i2c_get_clientdata(save_client); 517d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 518617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; /* watchdog register */ 519617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 520617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (wdt_margin > 31) 521617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = (wdt_margin & 0xFC) | 0x83; /* resolution = 4s */ 522617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto else 523617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* 524617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * WDS = 1 (0x80), mulitplier = WD_TIMO, resolution = 1s (0x02) 525617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 526617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = wdt_margin<<2 | 0x82; 527617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 528d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco /* 529d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco * M41T65 has three bits for watchdog resolution. Don't set bit 7, as 530d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco * that would be an invalid resolution. 531d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco */ 532d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco if (clientdata->features & M41T80_FEATURE_WD) 533d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco i2c_data[1] &= ~M41T80_WATCHDOG_RB2; 534d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 535617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs1, 1); 536617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 537617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 538617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 539617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_disable: 540617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 541617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * disables watchdog. 542617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 543617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic void wdt_disable(void) 544617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 545617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned char i2c_data[2], i2c_buf[0x10]; 546617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs0[2] = { 547617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 548617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 549617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 550617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 1, 551617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 552617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 553617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 554617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 555617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = I2C_M_RD, 556617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 1, 557617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_buf, 558617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 559617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 560617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs1[1] = { 561617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 562617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 563617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 564617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 2, 565617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 566617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 567617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 568617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 569617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; 570617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs0, 2); 571617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 572617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; 573617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = 0x00; 574617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs1, 1); 575617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 576617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 577617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 578617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_write: 579617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to the watchdog 580617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @buf: buffer to write (unused as data does not matter here 581617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @count: count of bytes 582617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @ppos: pointer to the position to write. No seeks allowed 583617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 584617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * A write to a watchdog device is defined as a keepalive signal. Any 585617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * write of data will do, as we we don't define content meaning. 586617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 587617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic ssize_t wdt_write(struct file *file, const char __user *buf, 588617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto size_t count, loff_t *ppos) 589617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 590617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Can't seek (pwrite) on this device 591617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (ppos != &file->f_pos) 592617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -ESPIPE; 593617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 594617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (count) { 595617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 596617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 1; 597617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 598617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 599617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 600617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 601617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic ssize_t wdt_read(struct file *file, char __user *buf, 602617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto size_t count, loff_t *ppos) 603617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 604617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 605617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 606617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 607617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 608617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_ioctl: 609617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @inode: inode of the device 610617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to the device 611617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @cmd: watchdog command 612617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @arg: argument pointer 613617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 614617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * The watchdog API defines a common set of functions for all watchdogs 615617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * according to their available features. We only actually usefully support 616617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * querying capabilities and current status. 617617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 618617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, 619617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned long arg) 620617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 621617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto int new_margin, rv; 622617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto static struct watchdog_info ident = { 623617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .options = WDIOF_POWERUNDER | WDIOF_KEEPALIVEPING | 624617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto WDIOF_SETTIMEOUT, 625617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .firmware_version = 1, 626617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .identity = "M41T80 WTD" 627617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 628617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 629617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto switch (cmd) { 630617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETSUPPORT: 631617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return copy_to_user((struct watchdog_info __user *)arg, &ident, 632617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto sizeof(ident)) ? -EFAULT : 0; 633617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 634617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETSTATUS: 635617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETBOOTSTATUS: 636617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return put_user(boot_flag, (int __user *)arg); 637617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_KEEPALIVE: 638617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 639617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 640617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_SETTIMEOUT: 641617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (get_user(new_margin, (int __user *)arg)) 642617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EFAULT; 643617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Arbitrary, can't find the card's limits */ 644617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (new_margin < 1 || new_margin > 124) 645617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EINVAL; 646617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_margin = new_margin; 647617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 648617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Fall */ 649617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETTIMEOUT: 650617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return put_user(wdt_margin, (int __user *)arg); 651617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 652617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_SETOPTIONS: 653617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (copy_from_user(&rv, (int __user *)arg, sizeof(int))) 654617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EFAULT; 655617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 656617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rv & WDIOS_DISABLECARD) { 6574c228db0b30fa12d65ae7461ce29ed1f4da12c5bMaciej W. Rozycki pr_info("rtc-m41t80: disable watchdog\n"); 658617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_disable(); 659617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 660617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 661617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rv & WDIOS_ENABLECARD) { 6624c228db0b30fa12d65ae7461ce29ed1f4da12c5bMaciej W. Rozycki pr_info("rtc-m41t80: enable watchdog\n"); 663617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 664617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 665617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 666617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EINVAL; 667617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 668617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -ENOTTY; 669617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 670617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 671617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 672617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_open: 673617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @inode: inode of device 674617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to device 675617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 676617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 677617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_open(struct inode *inode, struct file *file) 678617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 679617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) { 68041012735352e72b8a3f95521817dcad1b2986636Arnd Bergmann lock_kernel(); 68141012735352e72b8a3f95521817dcad1b2986636Arnd Bergmann if (test_and_set_bit(0, &wdt_is_open)) { 68241012735352e72b8a3f95521817dcad1b2986636Arnd Bergmann unlock_kernel(); 683617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EBUSY; 68441012735352e72b8a3f95521817dcad1b2986636Arnd Bergmann } 685617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* 686617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Activate 687617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 688617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_is_open = 1; 68941012735352e72b8a3f95521817dcad1b2986636Arnd Bergmann unlock_kernel(); 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{ 7623760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare int rc = 0; 763caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_device *rtc = NULL; 764caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_time tm; 765caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct m41t80_data *clientdata = NULL; 766caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 767caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C 768caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto | I2C_FUNC_SMBUS_BYTE_DATA)) { 769caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -ENODEV; 770caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 771caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 772caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 773caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_info(&client->dev, 774caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto "chip found, driver version " DRV_VERSION "\n"); 775caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 776caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto clientdata = kzalloc(sizeof(*clientdata), GFP_KERNEL); 777caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!clientdata) { 778caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -ENOMEM; 779caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 780caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 781caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 782caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rtc = rtc_device_register(client->name, &client->dev, 783caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto &m41t80_rtc_ops, THIS_MODULE); 784caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (IS_ERR(rtc)) { 785caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = PTR_ERR(rtc); 786caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rtc = NULL; 787caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 788caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 789caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 790caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto clientdata->rtc = rtc; 7913760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare clientdata->features = id->driver_data; 792caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto i2c_set_clientdata(client, clientdata); 793caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 794caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Make sure HT (Halt Update) bit is cleared */ 795caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR); 796caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc < 0) 797caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto ht_err; 798caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 799caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc & M41T80_ALHOUR_HT) { 8003760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_HT) { 801caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto m41t80_get_datetime(client, &tm); 802caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_info(&client->dev, "HT bit was set!\n"); 803caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_info(&client->dev, 804caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto "Power Down at " 805caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto "%04i-%02i-%02i %02i:%02i:%02i\n", 806caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_year + 1900, 807caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, 808caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_min, tm.tm_sec); 809caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 810caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, 811caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto M41T80_REG_ALARM_HOUR, 812caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc & ~M41T80_ALHOUR_HT) < 0) 813caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto ht_err; 814caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 815caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 816caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Make sure ST (stop) bit is cleared */ 817caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = i2c_smbus_read_byte_data(client, M41T80_REG_SEC); 818caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc < 0) 819caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto st_err; 820caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 821caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc & M41T80_SEC_ST) { 822caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, M41T80_REG_SEC, 823caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc & ~M41T80_SEC_ST) < 0) 824caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto st_err; 825caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 826caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 827caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = m41t80_sysfs_register(&client->dev); 828caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc) 829caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 830caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 831617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 8323760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_HT) { 833417607d05f41dbe2acccdb7a298a81d30ba1d22bMaciej W. Rozycki save_client = client; 834617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto rc = misc_register(&wdt_dev); 835617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rc) 836617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto goto exit; 837617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto rc = register_reboot_notifier(&wdt_notifier); 838617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rc) { 839617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto misc_deregister(&wdt_dev); 840617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto goto exit; 841617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 842617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 843617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif 844caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 845caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 846caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotost_err: 847caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -EIO; 848caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "Can't clear ST bit\n"); 849caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 850caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotoht_err: 851caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -EIO; 852caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "Can't clear HT bit\n"); 853caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 854caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 855caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotoexit: 856caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rtc) 857caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rtc_device_unregister(rtc); 858caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto kfree(clientdata); 859caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return rc; 860caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 861caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 862caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_remove(struct i2c_client *client) 863caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 864caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct m41t80_data *clientdata = i2c_get_clientdata(client); 865caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_device *rtc = clientdata->rtc; 866caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 867617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 8683760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_HT) { 869617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto misc_deregister(&wdt_dev); 870617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unregister_reboot_notifier(&wdt_notifier); 871617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 872617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif 873caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rtc) 874caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rtc_device_unregister(rtc); 875caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto kfree(clientdata); 876caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 877caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 878caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 879caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 880caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct i2c_driver m41t80_driver = { 881caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .driver = { 882afe1ab4d577892822de2c8e803fbfaed6ec44ba3David Brownell .name = "rtc-m41t80", 883caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 884caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .probe = m41t80_probe, 885caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .remove = m41t80_remove, 8863760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare .id_table = m41t80_id, 887caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 888caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 889caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int __init m41t80_rtc_init(void) 890caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 891caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return i2c_add_driver(&m41t80_driver); 892caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 893caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 894caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic void __exit m41t80_rtc_exit(void) 895caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 896caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto i2c_del_driver(&m41t80_driver); 897caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 898caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 899caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_AUTHOR("Alexander Bigga <ab@mycable.de>"); 900caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_DESCRIPTION("ST Microelectronics M41T80 series RTC I2C Client Driver"); 901caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_LICENSE("GPL"); 902caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_VERSION(DRV_VERSION); 903caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 904caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotomodule_init(m41t80_rtc_init); 905caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotomodule_exit(m41t80_rtc_exit); 906