litmus-rt.git - The LITMUS^RT kernel.

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Diffstat (limited to 'net/openvswitch')

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/* * Micro Crystal RV-3029C2 rtc class driver * * Author: Gregory Hermant <gregory.hermant@calao-systems.com> * * based on previously existing rtc class drivers * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * NOTE: Currently this driver only supports the bare minimum for read * and write the RTC and alarms. The extra features provided by this chip * (trickle charger, eeprom, T° compensation) are unavailable. */ #include <linux/module.h> #include <linux/i2c.h> #include <linux/bcd.h> #include <linux/rtc.h> /* Register map */ /* control section */ #define RV3029C2_ONOFF_CTRL 0x00 #define RV3029C2_IRQ_CTRL 0x01 #define RV3029C2_IRQ_CTRL_AIE (1 << 0) #define RV3029C2_IRQ_FLAGS 0x02 #define RV3029C2_IRQ_FLAGS_AF (1 << 0) #define RV3029C2_STATUS 0x03 #define RV3029C2_STATUS_VLOW1 (1 << 2) #define RV3029C2_STATUS_VLOW2 (1 << 3) #define RV3029C2_STATUS_SR (1 << 4) #define RV3029C2_STATUS_PON (1 << 5) #define RV3029C2_STATUS_EEBUSY (1 << 7) #define RV3029C2_RST_CTRL 0x04 #define RV3029C2_CONTROL_SECTION_LEN 0x05 /* watch section */ #define RV3029C2_W_SEC 0x08 #define RV3029C2_W_MINUTES 0x09 #define RV3029C2_W_HOURS 0x0A #define RV3029C2_REG_HR_12_24 (1<<6) /* 24h/12h mode */ #define RV3029C2_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */ #define RV3029C2_W_DATE 0x0B #define RV3029C2_W_DAYS 0x0C #define RV3029C2_W_MONTHS 0x0D #define RV3029C2_W_YEARS 0x0E #define RV3029C2_WATCH_SECTION_LEN 0x07 /* alarm section */ #define RV3029C2_A_SC 0x10 #define RV3029C2_A_MN 0x11 #define RV3029C2_A_HR 0x12 #define RV3029C2_A_DT 0x13 #define RV3029C2_A_DW 0x14 #define RV3029C2_A_MO 0x15 #define RV3029C2_A_YR 0x16 #define RV3029C2_ALARM_SECTION_LEN 0x07 /* timer section */ #define RV3029C2_TIMER_LOW 0x18 #define RV3029C2_TIMER_HIGH 0x19 /* temperature section */ #define RV3029C2_TEMP_PAGE 0x20 /* eeprom data section */ #define RV3029C2_E2P_EEDATA1 0x28 #define RV3029C2_E2P_EEDATA2 0x29 /* eeprom control section */ #define RV3029C2_CONTROL_E2P_EECTRL 0x30 #define RV3029C2_TRICKLE_1K (1<<0) /* 1K resistance */ #define RV3029C2_TRICKLE_5K (1<<1) /* 5K resistance */ #define RV3029C2_TRICKLE_20K (1<<2) /* 20K resistance */ #define RV3029C2_TRICKLE_80K (1<<3) /* 80K resistance */ #define RV3029C2_CONTROL_E2P_XTALOFFSET 0x31 #define RV3029C2_CONTROL_E2P_QCOEF 0x32 #define RV3029C2_CONTROL_E2P_TURNOVER 0x33 /* user ram section */ #define RV3029C2_USR1_RAM_PAGE 0x38 #define RV3029C2_USR1_SECTION_LEN 0x04 #define RV3029C2_USR2_RAM_PAGE 0x3C #define RV3029C2_USR2_SECTION_LEN 0x04 static int rv3029c2_i2c_read_regs(struct i2c_client *client, u8 reg, u8 *buf, unsigned len) { int ret; if ((reg > RV3029C2_USR1_RAM_PAGE + 7) || (reg + len > RV3029C2_USR1_RAM_PAGE + 8)) return -EINVAL; ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf); if (ret < 0) return ret; if (ret < len) return -EIO; return 0; } static int rv3029c2_i2c_write_regs(struct i2c_client *client, u8 reg, u8 const buf[], unsigned len) { if ((reg > RV3029C2_USR1_RAM_PAGE + 7) || (reg + len > RV3029C2_USR1_RAM_PAGE + 8)) return -EINVAL; return i2c_smbus_write_i2c_block_data(client, reg, len, buf); } static int rv3029c2_i2c_get_sr(struct i2c_client *client, u8 *buf) { int ret = rv3029c2_i2c_read_regs(client, RV3029C2_STATUS, buf, 1); if (ret < 0) return -EIO; dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]); return 0; } static int rv3029c2_i2c_set_sr(struct i2c_client *client, u8 val) { u8 buf[1]; int sr; buf[0] = val; sr = rv3029c2_i2c_write_regs(client, RV3029C2_STATUS, buf, 1); dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]); if (sr < 0) return -EIO; return 0; } static int rv3029c2_i2c_read_time(struct i2c_client *client, struct rtc_time *tm) { u8 buf[1]; int ret; u8 regs[RV3029C2_WATCH_SECTION_LEN] = { 0, }; ret = rv3029c2_i2c_get_sr(client, buf); if (ret < 0) { dev_err(&client->dev, "%s: reading SR failed\n", __func__); return -EIO; } ret = rv3029c2_i2c_read_regs(client, RV3029C2_W_SEC , regs, RV3029C2_WATCH_SECTION_LEN); if (ret < 0) { dev_err(&client->dev, "%s: reading RTC section failed\n", __func__); return ret; } tm->tm_sec = bcd2bin(regs[RV3029C2_W_SEC-RV3029C2_W_SEC]); tm->tm_min = bcd2bin(regs[RV3029C2_W_MINUTES-RV3029C2_W_SEC]); /* HR field has a more complex interpretation */ { const u8 _hr = regs[RV3029C2_W_HOURS-RV3029C2_W_SEC]; if (_hr & RV3029C2_REG_HR_12_24) { /* 12h format */ tm->tm_hour = bcd2bin(_hr & 0x1f); if (_hr & RV3029C2_REG_HR_PM) /* PM flag set */ tm->tm_hour += 12; } else /* 24h format */ tm->tm_hour = bcd2bin(_hr & 0x3f); } tm->tm_mday = bcd2bin(regs[RV3029C2_W_DATE-RV3029C2_W_SEC]); tm->tm_mon = bcd2bin(regs[RV3029C2_W_MONTHS-RV3029C2_W_SEC]) - 1; tm->tm_year = bcd2bin(regs[RV3029C2_W_YEARS-RV3029C2_W_SEC]) + 100; tm->tm_wday = bcd2bin(regs[RV3029C2_W_DAYS-RV3029C2_W_SEC]) - 1; return 0; }


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