rtc-m41t80.c revision 4ebabb78e46d1bc3e8ddaa8b6b88a41142756f4b
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 69caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define DRV_VERSION "0.05" 70caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 71613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmannstatic DEFINE_MUTEX(m41t80_rtc_mutex); 723760f736716f74bdc62a4ba5406934338da93eb2Jean Delvarestatic const struct i2c_device_id m41t80_id[] = { 73f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner { "m41t62", M41T80_FEATURE_SQ | M41T80_FEATURE_SQ_ALT }, 74d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t65", M41T80_FEATURE_HT | M41T80_FEATURE_WD }, 75d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t80", M41T80_FEATURE_SQ }, 76d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t81", M41T80_FEATURE_HT | M41T80_FEATURE_SQ}, 77d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t81s", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 78d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t82", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 79d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41t83", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 80d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41st84", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 81d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41st85", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 82d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco { "m41st87", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, 833760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare { } 84caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 853760f736716f74bdc62a4ba5406934338da93eb2Jean DelvareMODULE_DEVICE_TABLE(i2c, m41t80_id); 86caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 87caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostruct m41t80_data { 883760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare u8 features; 89caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_device *rtc; 90caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 91caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 92caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_get_datetime(struct i2c_client *client, 93caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_time *tm) 94caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 95caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 buf[M41T80_DATETIME_REG_SIZE], dt_addr[1] = { M41T80_REG_SEC }; 96caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs[] = { 97caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 98caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 99caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 100caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1, 101caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = dt_addr, 102caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 103caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 104caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 105caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = I2C_M_RD, 106caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, 107caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = buf + M41T80_REG_SEC, 108caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 109caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 110caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 111caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs, 2) < 0) { 112caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "read error\n"); 113caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 114caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 115caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 116fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk tm->tm_sec = bcd2bin(buf[M41T80_REG_SEC] & 0x7f); 117fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk tm->tm_min = bcd2bin(buf[M41T80_REG_MIN] & 0x7f); 118fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk tm->tm_hour = bcd2bin(buf[M41T80_REG_HOUR] & 0x3f); 119fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk tm->tm_mday = bcd2bin(buf[M41T80_REG_DAY] & 0x3f); 120caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm->tm_wday = buf[M41T80_REG_WDAY] & 0x07; 121fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk tm->tm_mon = bcd2bin(buf[M41T80_REG_MON] & 0x1f) - 1; 122caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 123caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* assume 20YY not 19YY, and ignore the Century Bit */ 124fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk tm->tm_year = bcd2bin(buf[M41T80_REG_YEAR]) + 100; 125b485fe5ea1008db02abff9ef15be4f31b52df4f7Wan ZongShun return rtc_valid_tm(tm); 126caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 127caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 128caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto/* Sets the given date and time to the real time clock. */ 129caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm) 130caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 131caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 wbuf[1 + M41T80_DATETIME_REG_SIZE]; 132caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 *buf = &wbuf[1]; 133caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 dt_addr[1] = { M41T80_REG_SEC }; 134caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs_in[] = { 135caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 136caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 137caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 138caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1, 139caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = dt_addr, 140caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 141caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 142caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 143caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = I2C_M_RD, 144caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, 145caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = buf + M41T80_REG_SEC, 146caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 147caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 148caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs[] = { 149caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 150caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 151caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 152caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1 + M41T80_DATETIME_REG_SIZE, 153caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = wbuf, 154caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 155caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 156caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 157caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Read current reg values into buf[1..7] */ 158caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { 159caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "read error\n"); 160caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 161caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 162caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 163caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto wbuf[0] = 0; /* offset into rtc's regs */ 164caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Merge time-data and register flags into buf[0..7] */ 165caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_SSEC] = 0; 166caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_SEC] = 167fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk bin2bcd(tm->tm_sec) | (buf[M41T80_REG_SEC] & ~0x7f); 168caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_MIN] = 169fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk bin2bcd(tm->tm_min) | (buf[M41T80_REG_MIN] & ~0x7f); 170caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_HOUR] = 171fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk bin2bcd(tm->tm_hour) | (buf[M41T80_REG_HOUR] & ~0x3f) ; 172caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_WDAY] = 173caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto (tm->tm_wday & 0x07) | (buf[M41T80_REG_WDAY] & ~0x07); 174caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_DAY] = 175fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk bin2bcd(tm->tm_mday) | (buf[M41T80_REG_DAY] & ~0x3f); 176caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto buf[M41T80_REG_MON] = 177fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk bin2bcd(tm->tm_mon + 1) | (buf[M41T80_REG_MON] & ~0x1f); 178caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* assume 20YY not 19YY */ 179fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk buf[M41T80_REG_YEAR] = bin2bcd(tm->tm_year % 100); 180caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 181caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs, 1) != 1) { 182caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "write error\n"); 183caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 184caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 185caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 186caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 187caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 188caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) 189caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_proc(struct device *dev, struct seq_file *seq) 190caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 191caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 192caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct m41t80_data *clientdata = i2c_get_clientdata(client); 193caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 reg; 194caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 1953760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_BL) { 196caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); 197caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto seq_printf(seq, "battery\t\t: %s\n", 198caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto (reg & M41T80_FLAGS_BATT_LOW) ? "exhausted" : "ok"); 199caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 200caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 201caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 202caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#else 203caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#define m41t80_rtc_proc NULL 204caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#endif 205caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 206caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_read_time(struct device *dev, struct rtc_time *tm) 207caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 208caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return m41t80_get_datetime(to_i2c_client(dev), tm); 209caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 210caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 211caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_set_time(struct device *dev, struct rtc_time *tm) 212caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 213caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return m41t80_set_datetime(to_i2c_client(dev), tm); 214caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 215caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 21648e9766726ebb8f5d98823fe6b32dff570bc04d8Paul Bolle/* 21748e9766726ebb8f5d98823fe6b32dff570bc04d8Paul Bolle * XXX - m41t80 alarm functionality is reported broken. 21848e9766726ebb8f5d98823fe6b32dff570bc04d8Paul Bolle * until it is fixed, don't register alarm functions. 21948e9766726ebb8f5d98823fe6b32dff570bc04d8Paul Bolle */ 220caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct rtc_class_ops m41t80_rtc_ops = { 221caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .read_time = m41t80_rtc_read_time, 222caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .set_time = m41t80_rtc_set_time, 223caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .proc = m41t80_rtc_proc, 224caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 225caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 226caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) 227caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_show_flags(struct device *dev, 228caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, char *buf) 229caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 230caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 231caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int val; 232caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 233caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); 234caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val < 0) 235caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 236caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sprintf(buf, "%#x\n", val); 237caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 238caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL); 239caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 240caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev, 241caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, char *buf) 242caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 243caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 244d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco struct m41t80_data *clientdata = i2c_get_clientdata(client); 245f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner int val, reg_sqw; 246caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 247d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco if (!(clientdata->features & M41T80_FEATURE_SQ)) 248d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco return -EINVAL; 249d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 250f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner reg_sqw = M41T80_REG_SQW; 251f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner if (clientdata->features & M41T80_FEATURE_SQ_ALT) 252f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner reg_sqw = M41T80_REG_WDAY; 253f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner val = i2c_smbus_read_byte_data(client, reg_sqw); 254caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val < 0) 255caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 256caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = (val >> 4) & 0xf; 257caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto switch (val) { 258caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case 0: 259caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 260caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case 1: 261caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 32768; 262caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 263caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto default: 264caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 32768 >> val; 265caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 266caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sprintf(buf, "%d\n", val); 267caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 268caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev, 269caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, 270caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto const char *buf, size_t count) 271caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 272caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 273d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco struct m41t80_data *clientdata = i2c_get_clientdata(client); 274f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner int almon, sqw, reg_sqw; 275caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int val = simple_strtoul(buf, NULL, 0); 276caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 277d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco if (!(clientdata->features & M41T80_FEATURE_SQ)) 278d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco return -EINVAL; 279d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 280caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val) { 281caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!is_power_of_2(val)) 282caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EINVAL; 283caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = ilog2(val); 284caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val == 15) 285caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 1; 286caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto else if (val < 14) 287caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 15 - val; 288caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto else 289caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EINVAL; 290caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 291caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* disable SQW, set SQW frequency & re-enable */ 292caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); 293caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (almon < 0) 294caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 295f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner reg_sqw = M41T80_REG_SQW; 296f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner if (clientdata->features & M41T80_FEATURE_SQ_ALT) 297f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner reg_sqw = M41T80_REG_WDAY; 298f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner sqw = i2c_smbus_read_byte_data(client, reg_sqw); 299caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (sqw < 0) 300caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 301caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto sqw = (sqw & 0x0f) | (val << 4); 302caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, 303caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto almon & ~M41T80_ALMON_SQWE) < 0 || 304f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner i2c_smbus_write_byte_data(client, reg_sqw, sqw) < 0) 305caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 306caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val && i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, 307caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto almon | M41T80_ALMON_SQWE) < 0) 308caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 309caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return count; 310caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 311caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR, 312caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto m41t80_sysfs_show_sqwfreq, m41t80_sysfs_set_sqwfreq); 313caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 314caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct attribute *attrs[] = { 315caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto &dev_attr_flags.attr, 316caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto &dev_attr_sqwfreq.attr, 317caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto NULL, 318caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 319caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct attribute_group attr_group = { 320caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .attrs = attrs, 321caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 322caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 323caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_sysfs_register(struct device *dev) 324caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 325caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sysfs_create_group(&dev->kobj, &attr_group); 326caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 327caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#else 328caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_sysfs_register(struct device *dev) 329caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 330caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 331caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 332caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#endif 333caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 334617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 335617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/* 336617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto ***************************************************************************** 337617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 338617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Watchdog Driver 339617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 340617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto ***************************************************************************** 341617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 342617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic struct i2c_client *save_client; 343617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 344617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/* Default margin */ 345617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#define WD_TIMO 60 /* 1..31 seconds */ 346617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 347617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_margin = WD_TIMO; 348617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotomodule_param(wdt_margin, int, 0); 349617780d290bd6eb2b260928c6acff5b7c6084154Atsushi NemotoMODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 60s)"); 350617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 351617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic unsigned long wdt_is_open; 352617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int boot_flag; 353617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 354617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 355617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_ping: 356617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 357617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Reload counter one with the watchdog timeout. We don't bother reloading 358617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * the cascade counter. 359617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 360617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic void wdt_ping(void) 361617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 362617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned char i2c_data[2]; 363617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs1[1] = { 364617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 365617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 366617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 367617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 2, 368617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 369617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 370617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 371d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco struct m41t80_data *clientdata = i2c_get_clientdata(save_client); 372d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 373617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; /* watchdog register */ 374617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 375617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (wdt_margin > 31) 376617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = (wdt_margin & 0xFC) | 0x83; /* resolution = 4s */ 377617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto else 378617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* 379617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * WDS = 1 (0x80), mulitplier = WD_TIMO, resolution = 1s (0x02) 380617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 381617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = wdt_margin<<2 | 0x82; 382617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 383d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco /* 384d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco * M41T65 has three bits for watchdog resolution. Don't set bit 7, as 385d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco * that would be an invalid resolution. 386d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco */ 387d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco if (clientdata->features & M41T80_FEATURE_WD) 388d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco i2c_data[1] &= ~M41T80_WATCHDOG_RB2; 389d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 390617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs1, 1); 391617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 392617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 393617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 394617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_disable: 395617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 396617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * disables watchdog. 397617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 398617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic void wdt_disable(void) 399617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 400617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned char i2c_data[2], i2c_buf[0x10]; 401617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs0[2] = { 402617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 403617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 404617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 405617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 1, 406617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 407617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 408617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 409617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 410617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = I2C_M_RD, 411617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 1, 412617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_buf, 413617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 414617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 415617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs1[1] = { 416617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 417617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 418617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 419617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 2, 420617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 421617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 422617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 423617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 424617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; 425617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs0, 2); 426617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 427617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; 428617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = 0x00; 429617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs1, 1); 430617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 431617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 432617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 433617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_write: 434617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to the watchdog 435617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @buf: buffer to write (unused as data does not matter here 436617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @count: count of bytes 437617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @ppos: pointer to the position to write. No seeks allowed 438617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 439617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * A write to a watchdog device is defined as a keepalive signal. Any 440617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * write of data will do, as we we don't define content meaning. 441617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 442617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic ssize_t wdt_write(struct file *file, const char __user *buf, 443617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto size_t count, loff_t *ppos) 444617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 445617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (count) { 446617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 447617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 1; 448617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 449617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 450617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 451617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 452617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic ssize_t wdt_read(struct file *file, char __user *buf, 453617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto size_t count, loff_t *ppos) 454617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 455617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 456617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 457617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 458617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 459617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_ioctl: 460617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @inode: inode of the device 461617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to the device 462617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @cmd: watchdog command 463617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @arg: argument pointer 464617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 465617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * The watchdog API defines a common set of functions for all watchdogs 466617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * according to their available features. We only actually usefully support 467617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * querying capabilities and current status. 468617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 46955929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmannstatic int wdt_ioctl(struct file *file, unsigned int cmd, 470617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned long arg) 471617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 472617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto int new_margin, rv; 473617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto static struct watchdog_info ident = { 474617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .options = WDIOF_POWERUNDER | WDIOF_KEEPALIVEPING | 475617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto WDIOF_SETTIMEOUT, 476617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .firmware_version = 1, 477617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .identity = "M41T80 WTD" 478617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 479617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 480617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto switch (cmd) { 481617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETSUPPORT: 482617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return copy_to_user((struct watchdog_info __user *)arg, &ident, 483617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto sizeof(ident)) ? -EFAULT : 0; 484617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 485617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETSTATUS: 486617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETBOOTSTATUS: 487617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return put_user(boot_flag, (int __user *)arg); 488617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_KEEPALIVE: 489617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 490617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 491617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_SETTIMEOUT: 492617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (get_user(new_margin, (int __user *)arg)) 493617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EFAULT; 494617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Arbitrary, can't find the card's limits */ 495617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (new_margin < 1 || new_margin > 124) 496617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EINVAL; 497617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_margin = new_margin; 498617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 499617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Fall */ 500617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETTIMEOUT: 501617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return put_user(wdt_margin, (int __user *)arg); 502617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 503617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_SETOPTIONS: 504617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (copy_from_user(&rv, (int __user *)arg, sizeof(int))) 505617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EFAULT; 506617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 507617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rv & WDIOS_DISABLECARD) { 5084c228db0b30fa12d65ae7461ce29ed1f4da12c5bMaciej W. Rozycki pr_info("rtc-m41t80: disable watchdog\n"); 509617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_disable(); 510617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 511617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 512617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rv & WDIOS_ENABLECARD) { 5134c228db0b30fa12d65ae7461ce29ed1f4da12c5bMaciej W. Rozycki pr_info("rtc-m41t80: enable watchdog\n"); 514617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 515617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 516617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 517617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EINVAL; 518617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 519617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -ENOTTY; 520617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 521617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 52255929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmannstatic long wdt_unlocked_ioctl(struct file *file, unsigned int cmd, 52355929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann unsigned long arg) 52455929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann{ 52555929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann int ret; 52655929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann 527613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_lock(&m41t80_rtc_mutex); 52855929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann ret = wdt_ioctl(file, cmd, arg); 529613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_unlock(&m41t80_rtc_mutex); 53055929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann 53155929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann return ret; 53255929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann} 53355929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann 534617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 535617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_open: 536617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @inode: inode of device 537617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to device 538617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 539617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 540617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_open(struct inode *inode, struct file *file) 541617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 542617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) { 543613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_lock(&m41t80_rtc_mutex); 54441012735352e72b8a3f95521817dcad1b2986636Arnd Bergmann if (test_and_set_bit(0, &wdt_is_open)) { 545613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_unlock(&m41t80_rtc_mutex); 546617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EBUSY; 54741012735352e72b8a3f95521817dcad1b2986636Arnd Bergmann } 548617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* 549617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Activate 550617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 551617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_is_open = 1; 552613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_unlock(&m41t80_rtc_mutex); 55309eeb1f5f4d9b52ab57820160dea6027bbea82a3Jan Blunck return nonseekable_open(inode, file); 554617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 555617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -ENODEV; 556617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 557617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 558617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 559617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_close: 560617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @inode: inode to board 561617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to board 562617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 563617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 564617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_release(struct inode *inode, struct file *file) 565617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 566617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) 567617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto clear_bit(0, &wdt_is_open); 568617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 569617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 570617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 571617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 572617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * notify_sys: 573617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @this: our notifier block 574617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @code: the event being reported 575617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @unused: unused 576617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 577617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Our notifier is called on system shutdowns. We want to turn the card 578617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * off at reboot otherwise the machine will reboot again during memory 579617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * test or worse yet during the following fsck. This would suck, in fact 580617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * trust me - if it happens it does suck. 581617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 582617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_notify_sys(struct notifier_block *this, unsigned long code, 583617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto void *unused) 584617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 585617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (code == SYS_DOWN || code == SYS_HALT) 586617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Disable Watchdog */ 587617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_disable(); 588617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return NOTIFY_DONE; 589617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 590617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 591617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic const struct file_operations wdt_fops = { 592617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .owner = THIS_MODULE, 593617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .read = wdt_read, 59455929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann .unlocked_ioctl = wdt_unlocked_ioctl, 595617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .write = wdt_write, 596617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .open = wdt_open, 597617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .release = wdt_release, 5986038f373a3dc1f1c26496e60b6c40b164716f07eArnd Bergmann .llseek = no_llseek, 599617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto}; 600617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 601617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic struct miscdevice wdt_dev = { 602617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .minor = WATCHDOG_MINOR, 603617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .name = "watchdog", 604617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .fops = &wdt_fops, 605617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto}; 606617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 607617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/* 608617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * The WDT card needs to learn about soft shutdowns in order to 609617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * turn the timebomb registers off. 610617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 611617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic struct notifier_block wdt_notifier = { 612617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .notifier_call = wdt_notify_sys, 613617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto}; 614617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif /* CONFIG_RTC_DRV_M41T80_WDT */ 615617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 616caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto/* 617caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto ***************************************************************************** 618caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * 619caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * Driver Interface 620caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * 621caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto ***************************************************************************** 622caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto */ 623d2653e92732bd3911feff6bee5e23dbf959381dbJean Delvarestatic int m41t80_probe(struct i2c_client *client, 624d2653e92732bd3911feff6bee5e23dbf959381dbJean Delvare const struct i2c_device_id *id) 625caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 6263760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare int rc = 0; 627caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_device *rtc = NULL; 628caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_time tm; 629caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct m41t80_data *clientdata = NULL; 630caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 631caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C 632caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto | I2C_FUNC_SMBUS_BYTE_DATA)) { 633caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -ENODEV; 634caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 635caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 636caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 637caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_info(&client->dev, 638caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto "chip found, driver version " DRV_VERSION "\n"); 639caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 6404ebabb78e46d1bc3e8ddaa8b6b88a41142756f4bJingoo Han clientdata = devm_kzalloc(&client->dev, sizeof(*clientdata), 6414ebabb78e46d1bc3e8ddaa8b6b88a41142756f4bJingoo Han GFP_KERNEL); 642caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!clientdata) { 643caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -ENOMEM; 644caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 645caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 646caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 647a015dbc110a97ed3147546a9c914f18f71d798d0John Stultz clientdata->features = id->driver_data; 648a015dbc110a97ed3147546a9c914f18f71d798d0John Stultz i2c_set_clientdata(client, clientdata); 649a015dbc110a97ed3147546a9c914f18f71d798d0John Stultz 6504ebabb78e46d1bc3e8ddaa8b6b88a41142756f4bJingoo Han rtc = devm_rtc_device_register(&client->dev, client->name, 6514ebabb78e46d1bc3e8ddaa8b6b88a41142756f4bJingoo Han &m41t80_rtc_ops, THIS_MODULE); 652caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (IS_ERR(rtc)) { 653caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = PTR_ERR(rtc); 654caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rtc = NULL; 655caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 656caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 657caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 658caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto clientdata->rtc = rtc; 659caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 660caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Make sure HT (Halt Update) bit is cleared */ 661caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR); 662caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc < 0) 663caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto ht_err; 664caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 665caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc & M41T80_ALHOUR_HT) { 6663760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_HT) { 667caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto m41t80_get_datetime(client, &tm); 668caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_info(&client->dev, "HT bit was set!\n"); 669caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_info(&client->dev, 670caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto "Power Down at " 671caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto "%04i-%02i-%02i %02i:%02i:%02i\n", 672caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_year + 1900, 673caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, 674caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_min, tm.tm_sec); 675caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 676caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, 677caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto M41T80_REG_ALARM_HOUR, 678caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc & ~M41T80_ALHOUR_HT) < 0) 679caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto ht_err; 680caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 681caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 682caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Make sure ST (stop) bit is cleared */ 683caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = i2c_smbus_read_byte_data(client, M41T80_REG_SEC); 684caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc < 0) 685caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto st_err; 686caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 687caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc & M41T80_SEC_ST) { 688caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, M41T80_REG_SEC, 689caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc & ~M41T80_SEC_ST) < 0) 690caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto st_err; 691caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 692caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 693caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = m41t80_sysfs_register(&client->dev); 694caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc) 695caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 696caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 697617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 6983760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_HT) { 699417607d05f41dbe2acccdb7a298a81d30ba1d22bMaciej W. Rozycki save_client = client; 700617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto rc = misc_register(&wdt_dev); 701617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rc) 702617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto goto exit; 703617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto rc = register_reboot_notifier(&wdt_notifier); 704617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rc) { 705617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto misc_deregister(&wdt_dev); 706617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto goto exit; 707617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 708617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 709617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif 710caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 711caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 712caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotost_err: 713caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -EIO; 714caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "Can't clear ST bit\n"); 715caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 716caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotoht_err: 717caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -EIO; 718caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "Can't clear HT bit\n"); 719caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 720caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 721caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotoexit: 722caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return rc; 723caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 724caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 725caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_remove(struct i2c_client *client) 726caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 7274ebabb78e46d1bc3e8ddaa8b6b88a41142756f4bJingoo Han#ifdef CONFIG_RTC_DRV_M41T80_WDT 728caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct m41t80_data *clientdata = i2c_get_clientdata(client); 729caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 7303760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_HT) { 731617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto misc_deregister(&wdt_dev); 732617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unregister_reboot_notifier(&wdt_notifier); 733617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 734617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif 735caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 736caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 737caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 738caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 739caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct i2c_driver m41t80_driver = { 740caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .driver = { 741afe1ab4d577892822de2c8e803fbfaed6ec44ba3David Brownell .name = "rtc-m41t80", 742caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 743caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .probe = m41t80_probe, 744caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .remove = m41t80_remove, 7453760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare .id_table = m41t80_id, 746caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 747caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 7480abc920116303e81702a38429a1b61a896e02b37Axel Linmodule_i2c_driver(m41t80_driver); 749caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 750caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_AUTHOR("Alexander Bigga <ab@mycable.de>"); 751caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_DESCRIPTION("ST Microelectronics M41T80 series RTC I2C Client Driver"); 752caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_LICENSE("GPL"); 753caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_VERSION(DRV_VERSION); 754