rtc-m41t80.c revision a015dbc110a97ed3147546a9c914f18f71d798d0
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 21616380c153a69c3784d2afaddfe0a22f353046cf6John Stultzstatic int m41t80_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) 217caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 218caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 219caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int rc; 220caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 221caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); 222caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc < 0) 223caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto err; 22416380c153a69c3784d2afaddfe0a22f353046cf6John Stultz 22516380c153a69c3784d2afaddfe0a22f353046cf6John Stultz if (enabled) 226caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc |= M41T80_ALMON_AFE; 22716380c153a69c3784d2afaddfe0a22f353046cf6John Stultz else 22816380c153a69c3784d2afaddfe0a22f353046cf6John Stultz rc &= ~M41T80_ALMON_AFE; 22916380c153a69c3784d2afaddfe0a22f353046cf6John Stultz 230caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, rc) < 0) 231caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto err; 23216380c153a69c3784d2afaddfe0a22f353046cf6John Stultz 233caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 234caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotoerr: 235caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 236caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 237caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 238caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *t) 239caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 240caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 241caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 wbuf[1 + M41T80_ALARM_REG_SIZE]; 242caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 *buf = &wbuf[1]; 243caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 *reg = buf - M41T80_REG_ALARM_MON; 244caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; 245caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs_in[] = { 246caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 247caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 248caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 249caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1, 250caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = dt_addr, 251caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 252caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 253caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 254caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = I2C_M_RD, 255caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = M41T80_ALARM_REG_SIZE, 256caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = buf, 257caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 258caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 259caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs[] = { 260caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 261caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 262caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 263caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1 + M41T80_ALARM_REG_SIZE, 264caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = wbuf, 265caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 266caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 267caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 268caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { 269caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "read error\n"); 270caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 271caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 272caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MON] &= ~(0x1f | M41T80_ALMON_AFE); 273caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_DAY] = 0; 274caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_HOUR] &= ~(0x3f | 0x80); 275caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MIN] = 0; 276caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_SEC] = 0; 277caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 278caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto wbuf[0] = M41T80_REG_ALARM_MON; /* offset into rtc's regs */ 279caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_SEC] |= t->time.tm_sec >= 0 ? 280fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk bin2bcd(t->time.tm_sec) : 0x80; 281caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MIN] |= t->time.tm_min >= 0 ? 282fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk bin2bcd(t->time.tm_min) : 0x80; 283caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_HOUR] |= t->time.tm_hour >= 0 ? 284fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk bin2bcd(t->time.tm_hour) : 0x80; 285caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_DAY] |= t->time.tm_mday >= 0 ? 286fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk bin2bcd(t->time.tm_mday) : 0x80; 287caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (t->time.tm_mon >= 0) 288fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk reg[M41T80_REG_ALARM_MON] |= bin2bcd(t->time.tm_mon + 1); 289caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto else 290caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_DAY] |= 0x40; 291caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 292caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs, 1) != 1) { 293caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "write error\n"); 294caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 295caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 296caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 297caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (t->enabled) { 298caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MON] |= M41T80_ALMON_AFE; 299caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, 300caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto reg[M41T80_REG_ALARM_MON]) < 0) { 301caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "write error\n"); 302caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 303caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 304caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 305caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 306caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 307caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 308caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *t) 309caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 310caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 311caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 buf[M41T80_ALARM_REG_SIZE + 1]; /* all alarm regs and flags */ 312caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; 313caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto u8 *reg = buf - M41T80_REG_ALARM_MON; 314caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_msg msgs[] = { 315caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 316caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 317caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = 0, 318caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = 1, 319caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = dt_addr, 320caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 321caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto { 322caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .addr = client->addr, 323caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .flags = I2C_M_RD, 324caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .len = M41T80_ALARM_REG_SIZE + 1, 325caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .buf = buf, 326caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 327caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }; 328caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 329caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_transfer(client->adapter, msgs, 2) < 0) { 330caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "read error\n"); 331caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 332caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 333caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_sec = -1; 334caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_min = -1; 335caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_hour = -1; 336caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_mday = -1; 337caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_mon = -1; 338caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_SEC] & 0x80)) 339fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk t->time.tm_sec = bcd2bin(reg[M41T80_REG_ALARM_SEC] & 0x7f); 340caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_MIN] & 0x80)) 341fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk t->time.tm_min = bcd2bin(reg[M41T80_REG_ALARM_MIN] & 0x7f); 342caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_HOUR] & 0x80)) 343fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk t->time.tm_hour = bcd2bin(reg[M41T80_REG_ALARM_HOUR] & 0x3f); 344caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_DAY] & 0x80)) 345fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk t->time.tm_mday = bcd2bin(reg[M41T80_REG_ALARM_DAY] & 0x3f); 346caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!(reg[M41T80_REG_ALARM_DAY] & 0x40)) 347fe20ba70abf7d6e5855c3dacc729490b3d0d077fAdrian Bunk t->time.tm_mon = bcd2bin(reg[M41T80_REG_ALARM_MON] & 0x1f) - 1; 348caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_year = -1; 349caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_wday = -1; 350caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_yday = -1; 351caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->time.tm_isdst = -1; 352caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->enabled = !!(reg[M41T80_REG_ALARM_MON] & M41T80_ALMON_AFE); 353caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto t->pending = !!(reg[M41T80_REG_FLAGS] & M41T80_FLAGS_AF); 354408929bed7841686ce5fdd06366fb652cb653d6cAtsushi Nemoto return 0; 355caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 356caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 357caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct rtc_class_ops m41t80_rtc_ops = { 358caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .read_time = m41t80_rtc_read_time, 359caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .set_time = m41t80_rtc_set_time, 360caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .read_alarm = m41t80_rtc_read_alarm, 361caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .set_alarm = m41t80_rtc_set_alarm, 362caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .proc = m41t80_rtc_proc, 36316380c153a69c3784d2afaddfe0a22f353046cf6John Stultz .alarm_irq_enable = m41t80_rtc_alarm_irq_enable, 364caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 365caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 366caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) 367caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_show_flags(struct device *dev, 368caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, char *buf) 369caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 370caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 371caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int val; 372caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 373caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); 374caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val < 0) 375caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 376caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sprintf(buf, "%#x\n", val); 377caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 378caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL); 379caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 380caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev, 381caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, char *buf) 382caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 383caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 384d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco struct m41t80_data *clientdata = i2c_get_clientdata(client); 385f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner int val, reg_sqw; 386caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 387d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco if (!(clientdata->features & M41T80_FEATURE_SQ)) 388d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco return -EINVAL; 389d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 390f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner reg_sqw = M41T80_REG_SQW; 391f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner if (clientdata->features & M41T80_FEATURE_SQ_ALT) 392f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner reg_sqw = M41T80_REG_WDAY; 393f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner val = i2c_smbus_read_byte_data(client, reg_sqw); 394caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val < 0) 395caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 396caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = (val >> 4) & 0xf; 397caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto switch (val) { 398caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case 0: 399caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 400caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto case 1: 401caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 32768; 402caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto break; 403caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto default: 404caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 32768 >> val; 405caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 406caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sprintf(buf, "%d\n", val); 407caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 408caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev, 409caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct device_attribute *attr, 410caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto const char *buf, size_t count) 411caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 412caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct i2c_client *client = to_i2c_client(dev); 413d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco struct m41t80_data *clientdata = i2c_get_clientdata(client); 414f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner int almon, sqw, reg_sqw; 415caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto int val = simple_strtoul(buf, NULL, 0); 416caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 417d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco if (!(clientdata->features & M41T80_FEATURE_SQ)) 418d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco return -EINVAL; 419d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 420caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val) { 421caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!is_power_of_2(val)) 422caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EINVAL; 423caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = ilog2(val); 424caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val == 15) 425caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 1; 426caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto else if (val < 14) 427caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto val = 15 - val; 428caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto else 429caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EINVAL; 430caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 431caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* disable SQW, set SQW frequency & re-enable */ 432caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); 433caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (almon < 0) 434caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 435f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner reg_sqw = M41T80_REG_SQW; 436f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner if (clientdata->features & M41T80_FEATURE_SQ_ALT) 437f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner reg_sqw = M41T80_REG_WDAY; 438f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner sqw = i2c_smbus_read_byte_data(client, reg_sqw); 439caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (sqw < 0) 440caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 441caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto sqw = (sqw & 0x0f) | (val << 4); 442caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, 443caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto almon & ~M41T80_ALMON_SQWE) < 0 || 444f30281f4f7c2a0efcfeddad12277dfdada8f08a7Daniel Glockner i2c_smbus_write_byte_data(client, reg_sqw, sqw) < 0) 445caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 446caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (val && i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, 447caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto almon | M41T80_ALMON_SQWE) < 0) 448caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return -EIO; 449caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return count; 450caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 451caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR, 452caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto m41t80_sysfs_show_sqwfreq, m41t80_sysfs_set_sqwfreq); 453caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 454caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct attribute *attrs[] = { 455caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto &dev_attr_flags.attr, 456caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto &dev_attr_sqwfreq.attr, 457caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto NULL, 458caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 459caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct attribute_group attr_group = { 460caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .attrs = attrs, 461caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 462caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 463caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_sysfs_register(struct device *dev) 464caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 465caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return sysfs_create_group(&dev->kobj, &attr_group); 466caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 467caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#else 468caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_sysfs_register(struct device *dev) 469caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 470caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 471caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 472caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto#endif 473caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 474617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 475617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/* 476617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto ***************************************************************************** 477617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 478617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Watchdog Driver 479617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 480617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto ***************************************************************************** 481617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 482617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic struct i2c_client *save_client; 483617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 484617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/* Default margin */ 485617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#define WD_TIMO 60 /* 1..31 seconds */ 486617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 487617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_margin = WD_TIMO; 488617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotomodule_param(wdt_margin, int, 0); 489617780d290bd6eb2b260928c6acff5b7c6084154Atsushi NemotoMODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 60s)"); 490617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 491617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic unsigned long wdt_is_open; 492617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int boot_flag; 493617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 494617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 495617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_ping: 496617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 497617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Reload counter one with the watchdog timeout. We don't bother reloading 498617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * the cascade counter. 499617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 500617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic void wdt_ping(void) 501617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 502617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned char i2c_data[2]; 503617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs1[1] = { 504617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 505617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 506617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 507617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 2, 508617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 509617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 510617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 511d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco struct m41t80_data *clientdata = i2c_get_clientdata(save_client); 512d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 513617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; /* watchdog register */ 514617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 515617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (wdt_margin > 31) 516617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = (wdt_margin & 0xFC) | 0x83; /* resolution = 4s */ 517617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto else 518617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* 519617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * WDS = 1 (0x80), mulitplier = WD_TIMO, resolution = 1s (0x02) 520617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 521617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = wdt_margin<<2 | 0x82; 522617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 523d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco /* 524d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco * M41T65 has three bits for watchdog resolution. Don't set bit 7, as 525d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco * that would be an invalid resolution. 526d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco */ 527d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco if (clientdata->features & M41T80_FEATURE_WD) 528d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco i2c_data[1] &= ~M41T80_WATCHDOG_RB2; 529d3a126fcf9df7dc59f1cc553c2fb2e668264e86cSteven A. Falco 530617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs1, 1); 531617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 532617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 533617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 534617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_disable: 535617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 536617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * disables watchdog. 537617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 538617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic void wdt_disable(void) 539617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 540617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned char i2c_data[2], i2c_buf[0x10]; 541617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs0[2] = { 542617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 543617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 544617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 545617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 1, 546617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 547617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 548617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 549617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 550617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = I2C_M_RD, 551617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 1, 552617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_buf, 553617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 554617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 555617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto struct i2c_msg msgs1[1] = { 556617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto { 557617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .addr = save_client->addr, 558617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .flags = 0, 559617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .len = 2, 560617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .buf = i2c_data, 561617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }, 562617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 563617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 564617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; 565617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs0, 2); 566617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 567617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[0] = 0x09; 568617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_data[1] = 0x00; 569617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto i2c_transfer(save_client->adapter, msgs1, 1); 570617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 571617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 572617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 573617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_write: 574617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to the watchdog 575617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @buf: buffer to write (unused as data does not matter here 576617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @count: count of bytes 577617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @ppos: pointer to the position to write. No seeks allowed 578617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 579617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * A write to a watchdog device is defined as a keepalive signal. Any 580617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * write of data will do, as we we don't define content meaning. 581617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 582617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic ssize_t wdt_write(struct file *file, const char __user *buf, 583617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto size_t count, loff_t *ppos) 584617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 585617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (count) { 586617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 587617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 1; 588617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 589617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 590617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 591617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 592617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic ssize_t wdt_read(struct file *file, char __user *buf, 593617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto size_t count, loff_t *ppos) 594617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 595617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 596617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 597617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 598617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 599617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_ioctl: 600617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @inode: inode of the device 601617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to the device 602617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @cmd: watchdog command 603617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @arg: argument pointer 604617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 605617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * The watchdog API defines a common set of functions for all watchdogs 606617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * according to their available features. We only actually usefully support 607617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * querying capabilities and current status. 608617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 60955929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmannstatic int wdt_ioctl(struct file *file, unsigned int cmd, 610617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unsigned long arg) 611617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 612617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto int new_margin, rv; 613617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto static struct watchdog_info ident = { 614617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .options = WDIOF_POWERUNDER | WDIOF_KEEPALIVEPING | 615617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto WDIOF_SETTIMEOUT, 616617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .firmware_version = 1, 617617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .identity = "M41T80 WTD" 618617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto }; 619617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 620617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto switch (cmd) { 621617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETSUPPORT: 622617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return copy_to_user((struct watchdog_info __user *)arg, &ident, 623617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto sizeof(ident)) ? -EFAULT : 0; 624617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 625617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETSTATUS: 626617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETBOOTSTATUS: 627617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return put_user(boot_flag, (int __user *)arg); 628617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_KEEPALIVE: 629617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 630617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 631617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_SETTIMEOUT: 632617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (get_user(new_margin, (int __user *)arg)) 633617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EFAULT; 634617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Arbitrary, can't find the card's limits */ 635617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (new_margin < 1 || new_margin > 124) 636617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EINVAL; 637617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_margin = new_margin; 638617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 639617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Fall */ 640617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_GETTIMEOUT: 641617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return put_user(wdt_margin, (int __user *)arg); 642617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 643617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto case WDIOC_SETOPTIONS: 644617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (copy_from_user(&rv, (int __user *)arg, sizeof(int))) 645617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EFAULT; 646617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 647617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rv & WDIOS_DISABLECARD) { 6484c228db0b30fa12d65ae7461ce29ed1f4da12c5bMaciej W. Rozycki pr_info("rtc-m41t80: disable watchdog\n"); 649617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_disable(); 650617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 651617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 652617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rv & WDIOS_ENABLECARD) { 6534c228db0b30fa12d65ae7461ce29ed1f4da12c5bMaciej W. Rozycki pr_info("rtc-m41t80: enable watchdog\n"); 654617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_ping(); 655617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 656617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 657617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EINVAL; 658617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 659617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -ENOTTY; 660617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 661617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 66255929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmannstatic long wdt_unlocked_ioctl(struct file *file, unsigned int cmd, 66355929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann unsigned long arg) 66455929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann{ 66555929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann int ret; 66655929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann 667613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_lock(&m41t80_rtc_mutex); 66855929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann ret = wdt_ioctl(file, cmd, arg); 669613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_unlock(&m41t80_rtc_mutex); 67055929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann 67155929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann return ret; 67255929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann} 67355929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann 674617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 675617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_open: 676617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @inode: inode of device 677617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to device 678617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 679617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 680617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_open(struct inode *inode, struct file *file) 681617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 682617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) { 683613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_lock(&m41t80_rtc_mutex); 68441012735352e72b8a3f95521817dcad1b2986636Arnd Bergmann if (test_and_set_bit(0, &wdt_is_open)) { 685613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_unlock(&m41t80_rtc_mutex); 686617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -EBUSY; 68741012735352e72b8a3f95521817dcad1b2986636Arnd Bergmann } 688617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* 689617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Activate 690617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 691617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_is_open = 1; 692613655fa39ff6957754fa8ceb8559980920eb8eeArnd Bergmann mutex_unlock(&m41t80_rtc_mutex); 69309eeb1f5f4d9b52ab57820160dea6027bbea82a3Jan Blunck return nonseekable_open(inode, file); 694617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 695617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return -ENODEV; 696617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 697617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 698617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 699617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * wdt_close: 700617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @inode: inode to board 701617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @file: file handle to board 702617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 703617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 704617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_release(struct inode *inode, struct file *file) 705617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 706617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) 707617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto clear_bit(0, &wdt_is_open); 708617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return 0; 709617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 710617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 711617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/** 712617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * notify_sys: 713617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @this: our notifier block 714617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @code: the event being reported 715617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * @unused: unused 716617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * 717617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * Our notifier is called on system shutdowns. We want to turn the card 718617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * off at reboot otherwise the machine will reboot again during memory 719617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * test or worse yet during the following fsck. This would suck, in fact 720617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * trust me - if it happens it does suck. 721617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 722617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic int wdt_notify_sys(struct notifier_block *this, unsigned long code, 723617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto void *unused) 724617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto{ 725617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (code == SYS_DOWN || code == SYS_HALT) 726617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto /* Disable Watchdog */ 727617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto wdt_disable(); 728617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto return NOTIFY_DONE; 729617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto} 730617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 731617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic const struct file_operations wdt_fops = { 732617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .owner = THIS_MODULE, 733617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .read = wdt_read, 73455929332c92e5d34d65a8f784604c92677ea3e15Arnd Bergmann .unlocked_ioctl = wdt_unlocked_ioctl, 735617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .write = wdt_write, 736617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .open = wdt_open, 737617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .release = wdt_release, 7386038f373a3dc1f1c26496e60b6c40b164716f07eArnd Bergmann .llseek = no_llseek, 739617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto}; 740617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 741617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic struct miscdevice wdt_dev = { 742617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .minor = WATCHDOG_MINOR, 743617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .name = "watchdog", 744617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .fops = &wdt_fops, 745617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto}; 746617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 747617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto/* 748617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * The WDT card needs to learn about soft shutdowns in order to 749617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto * turn the timebomb registers off. 750617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto */ 751617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemotostatic struct notifier_block wdt_notifier = { 752617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto .notifier_call = wdt_notify_sys, 753617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto}; 754617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif /* CONFIG_RTC_DRV_M41T80_WDT */ 755617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto 756caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto/* 757caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto ***************************************************************************** 758caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * 759caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * Driver Interface 760caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto * 761caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto ***************************************************************************** 762caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto */ 763d2653e92732bd3911feff6bee5e23dbf959381dbJean Delvarestatic int m41t80_probe(struct i2c_client *client, 764d2653e92732bd3911feff6bee5e23dbf959381dbJean Delvare const struct i2c_device_id *id) 765caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 7663760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare int rc = 0; 767caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_device *rtc = NULL; 768caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_time tm; 769caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct m41t80_data *clientdata = NULL; 770caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 771caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C 772caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto | I2C_FUNC_SMBUS_BYTE_DATA)) { 773caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -ENODEV; 774caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 775caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 776caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 777caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_info(&client->dev, 778caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto "chip found, driver version " DRV_VERSION "\n"); 779caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 780caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto clientdata = kzalloc(sizeof(*clientdata), GFP_KERNEL); 781caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (!clientdata) { 782caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -ENOMEM; 783caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 784caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 785caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 786a015dbc110a97ed3147546a9c914f18f71d798d0John Stultz clientdata->features = id->driver_data; 787a015dbc110a97ed3147546a9c914f18f71d798d0John Stultz i2c_set_clientdata(client, clientdata); 788a015dbc110a97ed3147546a9c914f18f71d798d0John Stultz 789caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rtc = rtc_device_register(client->name, &client->dev, 790caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto &m41t80_rtc_ops, THIS_MODULE); 791caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (IS_ERR(rtc)) { 792caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = PTR_ERR(rtc); 793caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rtc = NULL; 794caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 795caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 796caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 797caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto clientdata->rtc = rtc; 798caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 799caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Make sure HT (Halt Update) bit is cleared */ 800caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR); 801caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc < 0) 802caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto ht_err; 803caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 804caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc & M41T80_ALHOUR_HT) { 8053760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_HT) { 806caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto m41t80_get_datetime(client, &tm); 807caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_info(&client->dev, "HT bit was set!\n"); 808caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_info(&client->dev, 809caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto "Power Down at " 810caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto "%04i-%02i-%02i %02i:%02i:%02i\n", 811caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_year + 1900, 812caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, 813caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto tm.tm_min, tm.tm_sec); 814caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 815caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, 816caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto M41T80_REG_ALARM_HOUR, 817caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc & ~M41T80_ALHOUR_HT) < 0) 818caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto ht_err; 819caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 820caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 821caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto /* Make sure ST (stop) bit is cleared */ 822caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = i2c_smbus_read_byte_data(client, M41T80_REG_SEC); 823caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc < 0) 824caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto st_err; 825caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 826caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc & M41T80_SEC_ST) { 827caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (i2c_smbus_write_byte_data(client, M41T80_REG_SEC, 828caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc & ~M41T80_SEC_ST) < 0) 829caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto st_err; 830caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto } 831caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 832caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = m41t80_sysfs_register(&client->dev); 833caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rc) 834caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 835caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 836617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 8373760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_HT) { 838417607d05f41dbe2acccdb7a298a81d30ba1d22bMaciej W. Rozycki save_client = client; 839617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto rc = misc_register(&wdt_dev); 840617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rc) 841617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto goto exit; 842617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto rc = register_reboot_notifier(&wdt_notifier); 843617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto if (rc) { 844617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto misc_deregister(&wdt_dev); 845617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto goto exit; 846617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 847617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 848617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif 849caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 850caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 851caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotost_err: 852caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -EIO; 853caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "Can't clear ST bit\n"); 854caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 855caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotoht_err: 856caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rc = -EIO; 857caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto dev_err(&client->dev, "Can't clear HT bit\n"); 858caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto goto exit; 859caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 860caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotoexit: 861caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rtc) 862caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rtc_device_unregister(rtc); 863caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto kfree(clientdata); 864caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return rc; 865caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 866caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 867caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int m41t80_remove(struct i2c_client *client) 868caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 869caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct m41t80_data *clientdata = i2c_get_clientdata(client); 870caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto struct rtc_device *rtc = clientdata->rtc; 871caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 872617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#ifdef CONFIG_RTC_DRV_M41T80_WDT 8733760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare if (clientdata->features & M41T80_FEATURE_HT) { 874617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto misc_deregister(&wdt_dev); 875617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto unregister_reboot_notifier(&wdt_notifier); 876617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto } 877617780d290bd6eb2b260928c6acff5b7c6084154Atsushi Nemoto#endif 878caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto if (rtc) 879caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto rtc_device_unregister(rtc); 880caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto kfree(clientdata); 881caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 882caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return 0; 883caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 884caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 885caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic struct i2c_driver m41t80_driver = { 886caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .driver = { 887afe1ab4d577892822de2c8e803fbfaed6ec44ba3David Brownell .name = "rtc-m41t80", 888caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto }, 889caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .probe = m41t80_probe, 890caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto .remove = m41t80_remove, 8913760f736716f74bdc62a4ba5406934338da93eb2Jean Delvare .id_table = m41t80_id, 892caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto}; 893caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 894caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic int __init m41t80_rtc_init(void) 895caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 896caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto return i2c_add_driver(&m41t80_driver); 897caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 898caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 899caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotostatic void __exit m41t80_rtc_exit(void) 900caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto{ 901caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto i2c_del_driver(&m41t80_driver); 902caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto} 903caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 904caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_AUTHOR("Alexander Bigga <ab@mycable.de>"); 905caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_DESCRIPTION("ST Microelectronics M41T80 series RTC I2C Client Driver"); 906caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_LICENSE("GPL"); 907caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi NemotoMODULE_VERSION(DRV_VERSION); 908caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemoto 909caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotomodule_init(m41t80_rtc_init); 910caaff562e0ba44a7991ee8322fa4a6891d939757Atsushi Nemotomodule_exit(m41t80_rtc_exit); 911