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> 23613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann#include <linux/mutex.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 */ 67f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner#define M41T80_FEATURE_SQ_ALT (1 << 4) /* RSx bits are in reg 4 */ 68caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 69613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmannstatic DEFINE_MUTEX(m41t80_rtc_mutex); 703760f736716f74bdc62a4ba5406934338da93eb2Jean Delvarestatic const struct i2c_device_id m41t80_id[] = { 71f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner { "m41t62", M41T80_FEATURE_SQ | M41T80_FEATURE_SQ_ALT }, 72d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t65", M41T80_FEATURE_HT | M41T80_FEATURE_WD }, 73d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t80", M41T80_FEATURE_SQ }, 74d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t81", M41T80_FEATURE_HT | M41T80_FEATURE_SQ}, 75d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t81s", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 76d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t82", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 77d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t83", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 78d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41st84", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 79d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41st85", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 80d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41st87", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 816b1a5235498d6002d40cb0503365154e49c53122Wolfram Sang { "rv4162", M41T80_FEATURE_SQ | M41T80_FEATURE_WD | M41T80_FEATURE_SQ_ALT }, 823760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare { } 83caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 843760f736716f74bdc62a4ba5406934338da93eb2Jean DelvareMODULE_DEVICE_TABLE(i2c, m41t80_id); 85caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 86caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostruct m41t80_data { 873760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare u8 features; 88caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_device *rtc; 89caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 90caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 91caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_get_datetime(struct i2c_client *client, 92caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_time *tm) 93caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 94caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 buf[M41T80_DATETIME_REG_SIZE], dt_addr[1] = { M41T80_REG_SEC }; 95caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs[] = { 96caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 97caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 98caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 99caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1, 100caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = dt_addr, 101caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 102caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 103caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 104caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = I2C_M_RD, 105caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, 106caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = buf + M41T80_REG_SEC, 107caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 108caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 109caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 110caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs, 2) < 0) { 111caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "read error\n"); 112caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 113caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 114caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 115fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk tm->tm_sec = bcd2bin(buf[M41T80_REG_SEC] & 0x7f); 116fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk tm->tm_min = bcd2bin(buf[M41T80_REG_MIN] & 0x7f); 117fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk tm->tm_hour = bcd2bin(buf[M41T80_REG_HOUR] & 0x3f); 118fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk tm->tm_mday = bcd2bin(buf[M41T80_REG_DAY] & 0x3f); 119caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_wday = buf[M41T80_REG_WDAY] & 0x07; 120fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk tm->tm_mon = bcd2bin(buf[M41T80_REG_MON] & 0x1f) - 1; 121caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 122caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* assume 20YY not 19YY, and ignore the Century Bit */ 123fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk tm->tm_year = bcd2bin(buf[M41T80_REG_YEAR]) + 100; 124b485fe5ea1008db02abff9ef15be4f31b52df4f7Wan ZongShun return rtc_valid_tm(tm); 125caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 126caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 127caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto/* Sets the given date and time to the real time clock. */ 128caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm) 129caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 130caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 wbuf[1 + M41T80_DATETIME_REG_SIZE]; 131caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 *buf = &wbuf[1]; 132caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 dt_addr[1] = { M41T80_REG_SEC }; 133caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs_in[] = { 134caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 135caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 136caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 137caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1, 138caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = dt_addr, 139caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 140caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 141caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 142caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = I2C_M_RD, 143caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, 144caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = buf + M41T80_REG_SEC, 145caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 146caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 147caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs[] = { 148caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 149caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 150caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 151caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1 + M41T80_DATETIME_REG_SIZE, 152caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = wbuf, 153caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 154caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 155caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 156caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Read current reg values into buf[1..7] */ 157caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { 158caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "read error\n"); 159caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 160caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 161caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 162caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto wbuf[0] = 0; /* offset into rtc's regs */ 163caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Merge time-data and register flags into buf[0..7] */ 164caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_SSEC] = 0; 165caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_SEC] = 166fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk bin2bcd(tm->tm_sec) | (buf[M41T80_REG_SEC] & ~0x7f); 167caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_MIN] = 168fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk bin2bcd(tm->tm_min) | (buf[M41T80_REG_MIN] & ~0x7f); 169caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_HOUR] = 170e46527d289a8e7dbdf9249c64a5245cc7a7ee699Sachin Kamat bin2bcd(tm->tm_hour) | (buf[M41T80_REG_HOUR] & ~0x3f); 171caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_WDAY] = 172caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto (tm->tm_wday & 0x07) | (buf[M41T80_REG_WDAY] & ~0x07); 173caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_DAY] = 174fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk bin2bcd(tm->tm_mday) | (buf[M41T80_REG_DAY] & ~0x3f); 175caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_MON] = 176fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk bin2bcd(tm->tm_mon + 1) | (buf[M41T80_REG_MON] & ~0x1f); 177caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* assume 20YY not 19YY */ 178fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk buf[M41T80_REG_YEAR] = bin2bcd(tm->tm_year % 100); 179caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 180caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs, 1) != 1) { 181caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "write error\n"); 182caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 183caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 184caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 185caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 186caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 187caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) 188caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_proc(struct device *dev, struct seq_file *seq) 189caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 190caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 191caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct m41t80_data *clientdata = i2c_get_clientdata(client); 192caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 reg; 193caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 1943760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_BL) { 195caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); 196caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto seq_printf(seq, "battery\t\t: %s\n", 197caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto (reg & M41T80_FLAGS_BATT_LOW) ? "exhausted" : "ok"); 198caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 199caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 200caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 201caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#else 202caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define m41t80_rtc_proc NULL 203caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#endif 204caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 205caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_read_time(struct device *dev, struct rtc_time *tm) 206caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 207caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return m41t80_get_datetime(to_i2c_client(dev), tm); 208caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 209caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 210caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_set_time(struct device *dev, struct rtc_time *tm) 211caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 212caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return m41t80_set_datetime(to_i2c_client(dev), tm); 213caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 214caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 21548e9766726ebb8f5d98823fe6b32dff570bc04d8Paul Bolle/* 21648e9766726ebb8f5d98823fe6b32dff570bc04d8Paul Bolle * XXX - m41t80 alarm functionality is reported broken. 21748e9766726ebb8f5d98823fe6b32dff570bc04d8Paul Bolle * until it is fixed, don't register alarm functions. 21848e9766726ebb8f5d98823fe6b32dff570bc04d8Paul Bolle */ 219caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct rtc_class_ops m41t80_rtc_ops = { 220caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .read_time = m41t80_rtc_read_time, 221caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .set_time = m41t80_rtc_set_time, 222caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .proc = m41t80_rtc_proc, 223caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 224caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 225caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) 226caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_show_flags(struct device *dev, 227caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, char *buf) 228caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 229caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 230caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int val; 231caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 232caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); 233caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val < 0) 23485d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang return val; 235caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sprintf(buf, "%#x\n", val); 236caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 237caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL); 238caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 239caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev, 240caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, char *buf) 241caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 242caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 243d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco struct m41t80_data *clientdata = i2c_get_clientdata(client); 244f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner int val, reg_sqw; 245caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 246d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco if (!(clientdata->features & M41T80_FEATURE_SQ)) 247d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco return -EINVAL; 248d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 249f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner reg_sqw = M41T80_REG_SQW; 250f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner if (clientdata->features & M41T80_FEATURE_SQ_ALT) 251f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner reg_sqw = M41T80_REG_WDAY; 252f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner val = i2c_smbus_read_byte_data(client, reg_sqw); 253caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val < 0) 25485d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang return val; 255caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = (val >> 4) & 0xf; 256caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto switch (val) { 257caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case 0: 258caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 259caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case 1: 260caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 32768; 261caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 262caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto default: 263caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 32768 >> val; 264caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 265caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sprintf(buf, "%d\n", val); 266caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 267caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev, 268caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, 269caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto const char *buf, size_t count) 270caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 271caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 272d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco struct m41t80_data *clientdata = i2c_get_clientdata(client); 27385d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang int almon, sqw, reg_sqw, rc; 274caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int val = simple_strtoul(buf, NULL, 0); 275caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 276d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco if (!(clientdata->features & M41T80_FEATURE_SQ)) 277d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco return -EINVAL; 278d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 279caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val) { 280caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!is_power_of_2(val)) 281caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EINVAL; 282caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = ilog2(val); 283caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val == 15) 284caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 1; 285caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto else if (val < 14) 286caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 15 - val; 287caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto else 288caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EINVAL; 289caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 290caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* disable SQW, set SQW frequency & re-enable */ 291caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); 292caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (almon < 0) 29385d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang return almon; 294f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner reg_sqw = M41T80_REG_SQW; 295f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner if (clientdata->features & M41T80_FEATURE_SQ_ALT) 296f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner reg_sqw = M41T80_REG_WDAY; 297f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner sqw = i2c_smbus_read_byte_data(client, reg_sqw); 298caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (sqw < 0) 29985d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang return sqw; 300caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto sqw = (sqw & 0x0f) | (val << 4); 30185d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang 30285d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, 30385d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang almon & ~M41T80_ALMON_SQWE); 30485d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang if (rc < 0) 30585d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang return rc; 30685d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang 30785d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang if (val) { 30885d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang rc = i2c_smbus_write_byte_data(client, reg_sqw, sqw); 30985d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang if (rc < 0) 31085d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang return rc; 31185d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang 31285d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, 31385d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang almon | M41T80_ALMON_SQWE); 31485d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang if (rc <0) 31585d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang return rc; 31685d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang } 317caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return count; 318caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 319caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR, 320caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto m41t80_sysfs_show_sqwfreq, m41t80_sysfs_set_sqwfreq); 321caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 322caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct attribute *attrs[] = { 323caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto &dev_attr_flags.attr, 324caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto &dev_attr_sqwfreq.attr, 325caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto NULL, 326caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 327caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct attribute_group attr_group = { 328caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .attrs = attrs, 329caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 330caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 331caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_sysfs_register(struct device *dev) 332caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 333caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sysfs_create_group(&dev->kobj, &attr_group); 334caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 335caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#else 336caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_sysfs_register(struct device *dev) 337caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 338caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 339caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 340caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#endif 341caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 342617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 343617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/* 344617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto ***************************************************************************** 345617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 346617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Watchdog Driver 347617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 348617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto ***************************************************************************** 349617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 350617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic struct i2c_client *save_client; 351617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 352617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/* Default margin */ 353617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#define WD_TIMO 60 /* 1..31 seconds */ 354617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 355617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_margin = WD_TIMO; 356617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotomodule_param(wdt_margin, int, 0); 357617780d290bd6eb2b260928c6acff5b7c6084154Atsushi NemotoMODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 60s)"); 358617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 359617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic unsigned long wdt_is_open; 360617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int boot_flag; 361617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 362617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 363617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_ping: 364617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 365617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Reload counter one with the watchdog timeout. We don't bother reloading 366617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * the cascade counter. 367617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 368617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic void wdt_ping(void) 369617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 370617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned char i2c_data[2]; 371617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs1[1] = { 372617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 373617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 374617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 375617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 2, 376617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 377617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 378617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 379d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco struct m41t80_data *clientdata = i2c_get_clientdata(save_client); 380d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 381617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; /* watchdog register */ 382617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 383617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (wdt_margin > 31) 384617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = (wdt_margin & 0xFC) | 0x83; /* resolution = 4s */ 385617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto else 386617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* 387617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * WDS = 1 (0x80), mulitplier = WD_TIMO, resolution = 1s (0x02) 388617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 389617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = wdt_margin<<2 | 0x82; 390617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 391d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco /* 392d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco * M41T65 has three bits for watchdog resolution. Don't set bit 7, as 393d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco * that would be an invalid resolution. 394d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco */ 395d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco if (clientdata->features & M41T80_FEATURE_WD) 396d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco i2c_data[1] &= ~M41T80_WATCHDOG_RB2; 397d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 398617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs1, 1); 399617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 400617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 401617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 402617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_disable: 403617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 404617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * disables watchdog. 405617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 406617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic void wdt_disable(void) 407617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 408617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned char i2c_data[2], i2c_buf[0x10]; 409617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs0[2] = { 410617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 411617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 412617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 413617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 1, 414617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 415617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 416617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 417617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 418617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = I2C_M_RD, 419617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 1, 420617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_buf, 421617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 422617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 423617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs1[1] = { 424617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 425617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 426617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 427617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 2, 428617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 429617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 430617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 431617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 432617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; 433617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs0, 2); 434617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 435617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; 436617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = 0x00; 437617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs1, 1); 438617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 439617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 440617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 441617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_write: 442617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to the watchdog 443617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @buf: buffer to write (unused as data does not matter here 444617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @count: count of bytes 445617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @ppos: pointer to the position to write. No seeks allowed 446617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 447617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * A write to a watchdog device is defined as a keepalive signal. Any 448617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * write of data will do, as we we don't define content meaning. 449617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 450617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic ssize_t wdt_write(struct file *file, const char __user *buf, 451617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto size_t count, loff_t *ppos) 452617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 453617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (count) { 454617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 455617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 1; 456617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 457617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 458617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 459617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 460617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic ssize_t wdt_read(struct file *file, char __user *buf, 461617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto size_t count, loff_t *ppos) 462617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 463617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 464617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 465617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 466617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 467617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_ioctl: 468617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @inode: inode of the device 469617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to the device 470617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @cmd: watchdog command 471617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @arg: argument pointer 472617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 473617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * The watchdog API defines a common set of functions for all watchdogs 474617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * according to their available features. We only actually usefully support 475617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * querying capabilities and current status. 476617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 47755929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmannstatic int wdt_ioctl(struct file *file, unsigned int cmd, 478617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned long arg) 479617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 480617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto int new_margin, rv; 481617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto static struct watchdog_info ident = { 482617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .options = WDIOF_POWERUNDER | WDIOF_KEEPALIVEPING | 483617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto WDIOF_SETTIMEOUT, 484617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .firmware_version = 1, 485617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .identity = "M41T80 WTD" 486617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 487617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 488617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto switch (cmd) { 489617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETSUPPORT: 490617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return copy_to_user((struct watchdog_info __user *)arg, &ident, 491617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto sizeof(ident)) ? -EFAULT : 0; 492617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 493617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETSTATUS: 494617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETBOOTSTATUS: 495617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return put_user(boot_flag, (int __user *)arg); 496617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_KEEPALIVE: 497617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 498617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 499617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_SETTIMEOUT: 500617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (get_user(new_margin, (int __user *)arg)) 501617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EFAULT; 502617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Arbitrary, can't find the card's limits */ 503617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (new_margin < 1 || new_margin > 124) 504617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EINVAL; 505617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_margin = new_margin; 506617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 507617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Fall */ 508617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETTIMEOUT: 509617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return put_user(wdt_margin, (int __user *)arg); 510617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 511617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_SETOPTIONS: 512617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (copy_from_user(&rv, (int __user *)arg, sizeof(int))) 513617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EFAULT; 514617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 515617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rv & WDIOS_DISABLECARD) { 5164c228db0b30fa12d65ae7461ce29ed1f4da12c5bMaciej W. Rozycki pr_info("rtc-m41t80: disable watchdog\n"); 517617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_disable(); 518617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 519617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 520617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rv & WDIOS_ENABLECARD) { 5214c228db0b30fa12d65ae7461ce29ed1f4da12c5bMaciej W. Rozycki pr_info("rtc-m41t80: enable watchdog\n"); 522617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 523617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 524617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 525617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EINVAL; 526617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 527617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -ENOTTY; 528617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 529617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 53055929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmannstatic long wdt_unlocked_ioctl(struct file *file, unsigned int cmd, 53155929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann unsigned long arg) 53255929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann{ 53355929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann int ret; 53455929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann 535613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_lock(&m41t80_rtc_mutex); 53655929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann ret = wdt_ioctl(file, cmd, arg); 537613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_unlock(&m41t80_rtc_mutex); 53855929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann 53955929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann return ret; 54055929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann} 54155929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann 542617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 543617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_open: 544617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @inode: inode of device 545617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to device 546617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 547617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 548617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_open(struct inode *inode, struct file *file) 549617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 550617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) { 551613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_lock(&m41t80_rtc_mutex); 55241012735352e72b8a3f95521817dcad1b2986636Arnd Bergmann if (test_and_set_bit(0, &wdt_is_open)) { 553613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_unlock(&m41t80_rtc_mutex); 554617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EBUSY; 55541012735352e72b8a3f95521817dcad1b2986636Arnd Bergmann } 556617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* 557617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Activate 558617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 559617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_is_open = 1; 560613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_unlock(&m41t80_rtc_mutex); 56109eeb1f5f4d9b52ab57820160dea6027bbea82a3Jan Blunck return nonseekable_open(inode, file); 562617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 563617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -ENODEV; 564617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 565617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 566617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 567617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_close: 568617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @inode: inode to board 569617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to board 570617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 571617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 572617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_release(struct inode *inode, struct file *file) 573617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 574617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) 575617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto clear_bit(0, &wdt_is_open); 576617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 577617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 578617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 579617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 580617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * notify_sys: 581617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @this: our notifier block 582617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @code: the event being reported 583617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @unused: unused 584617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 585617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Our notifier is called on system shutdowns. We want to turn the card 586617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * off at reboot otherwise the machine will reboot again during memory 587617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * test or worse yet during the following fsck. This would suck, in fact 588617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * trust me - if it happens it does suck. 589617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 590617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_notify_sys(struct notifier_block *this, unsigned long code, 591617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto void *unused) 592617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 593617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (code == SYS_DOWN || code == SYS_HALT) 594617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Disable Watchdog */ 595617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_disable(); 596617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return NOTIFY_DONE; 597617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 598617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 599617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic const struct file_operations wdt_fops = { 600617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .owner = THIS_MODULE, 601617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .read = wdt_read, 60255929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann .unlocked_ioctl = wdt_unlocked_ioctl, 603617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .write = wdt_write, 604617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .open = wdt_open, 605617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .release = wdt_release, 6066038f373a3dc1f1c26496e60b6c40b164716f07eArnd Bergmann .llseek = no_llseek, 607617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto}; 608617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 609617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic struct miscdevice wdt_dev = { 610617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .minor = WATCHDOG_MINOR, 611617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .name = "watchdog", 612617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .fops = &wdt_fops, 613617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto}; 614617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 615617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/* 616617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * The WDT card needs to learn about soft shutdowns in order to 617617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * turn the timebomb registers off. 618617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 619617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic struct notifier_block wdt_notifier = { 620617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .notifier_call = wdt_notify_sys, 621617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto}; 622617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif /* CONFIG_RTC_DRV_M41T80_WDT */ 623617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 624caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto/* 625caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto ***************************************************************************** 626caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * 627caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * Driver Interface 628caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * 629caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto ***************************************************************************** 630caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto */ 631d2653e92732bd3911feff6bee5e23dbf959381dbJean Delvarestatic int m41t80_probe(struct i2c_client *client, 632d2653e92732bd3911feff6bee5e23dbf959381dbJean Delvare const struct i2c_device_id *id) 633caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 6343760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare int rc = 0; 635caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_device *rtc = NULL; 636caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_time tm; 637caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct m41t80_data *clientdata = NULL; 638caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 639caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C 640c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang | I2C_FUNC_SMBUS_BYTE_DATA)) 641c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang return -ENODEV; 642caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 6434ebabb78e46d1bc3e8ddaa8b6b88a41142756f4bJingoo Han clientdata = devm_kzalloc(&client->dev, sizeof(*clientdata), 6444ebabb78e46d1bc3e8ddaa8b6b88a41142756f4bJingoo Han GFP_KERNEL); 645c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang if (!clientdata) 646c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang return -ENOMEM; 647caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 648a015dbc110a97ed3147546a9c914f18f71d798d0John Stultz clientdata->features = id->driver_data; 649a015dbc110a97ed3147546a9c914f18f71d798d0John Stultz i2c_set_clientdata(client, clientdata); 650a015dbc110a97ed3147546a9c914f18f71d798d0John Stultz 6514ebabb78e46d1bc3e8ddaa8b6b88a41142756f4bJingoo Han rtc = devm_rtc_device_register(&client->dev, client->name, 6524ebabb78e46d1bc3e8ddaa8b6b88a41142756f4bJingoo Han &m41t80_rtc_ops, THIS_MODULE); 653c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang if (IS_ERR(rtc)) 654c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang return PTR_ERR(rtc); 655caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 656caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto clientdata->rtc = rtc; 657caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 658caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Make sure HT (Halt Update) bit is cleared */ 659caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR); 660caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 661c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang if (rc >= 0 && rc & M41T80_ALHOUR_HT) { 6623760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_HT) { 663caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto m41t80_get_datetime(client, &tm); 664caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_info(&client->dev, "HT bit was set!\n"); 665caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_info(&client->dev, 666caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto "Power Down at " 667caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto "%04i-%02i-%02i %02i:%02i:%02i\n", 668caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_year + 1900, 669caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, 670caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_min, tm.tm_sec); 671caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 672c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_HOUR, 673c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang rc & ~M41T80_ALHOUR_HT); 674c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang } 675c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang 676c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang if (rc < 0) { 677c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang dev_err(&client->dev, "Can't clear HT bit\n"); 67885d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang return rc; 679caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 680caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 681caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Make sure ST (stop) bit is cleared */ 682caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = i2c_smbus_read_byte_data(client, M41T80_REG_SEC); 683caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 684c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang if (rc >= 0 && rc & M41T80_SEC_ST) 685c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang rc = i2c_smbus_write_byte_data(client, M41T80_REG_SEC, 686c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang rc & ~M41T80_SEC_ST); 687c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang if (rc < 0) { 688c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang dev_err(&client->dev, "Can't clear ST bit\n"); 68985d77047c4eaa247bc19a581dba968571dd87e55Wolfram Sang return rc; 690caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 691caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 692caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = m41t80_sysfs_register(&client->dev); 693caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc) 694c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang return rc; 695caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 696617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 6973760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_HT) { 698417607d05f41dbe2acccdb7a298a81d30ba1d22bMaciej W. Rozycki save_client = client; 699617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto rc = misc_register(&wdt_dev); 700617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rc) 701c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang return rc; 702617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto rc = register_reboot_notifier(&wdt_notifier); 703617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rc) { 704617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto misc_deregister(&wdt_dev); 705c67fedfab2d29de88a62282e0633d43329552703Wolfram Sang return rc; 706617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 707617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 708617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif 709caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 710caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 711caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 712caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_remove(struct i2c_client *client) 713caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 7144ebabb78e46d1bc3e8ddaa8b6b88a41142756f4bJingoo Han#ifdef CONFIG_RTC_DRV_M41T80_WDT 715caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct m41t80_data *clientdata = i2c_get_clientdata(client); 716caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 7173760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_HT) { 718617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto misc_deregister(&wdt_dev); 719617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unregister_reboot_notifier(&wdt_notifier); 720617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 721617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif 722caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 723caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 724caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 725caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 726caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct i2c_driver m41t80_driver = { 727caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .driver = { 728afe1ab4d577892822de2c8e803fbfaed6ec44ba3David Brownell .name = "rtc-m41t80", 729caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 730caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .probe = m41t80_probe, 731caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .remove = m41t80_remove, 7323760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare .id_table = m41t80_id, 733caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 734caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 7350abc920116303e81702a38429a1b61a896e02b37Axel Linmodule_i2c_driver(m41t80_driver); 736caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 737caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_AUTHOR("Alexander Bigga <ab@mycable.de>"); 738caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_DESCRIPTION("ST Microelectronics M41T80 series RTC I2C Client Driver"); 739caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_LICENSE("GPL"); 740