rtc: add rv3029c2 RTC support
Add support for the Micro Crystal RV3029-C2 RTC chips. Signed-off-by: Heiko Schocher <hs@denx.de> Signed-off-by: Gregory Hermant <gregory.hermant@calao-systems.com> Cc: Wan ZongShun <mcuos.com@gmail.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Heiko Schocher
Linus Torvalds
parent
ae3551f9ca
commit
52365230ee
3 changed files with 464 additions and 0 deletions
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@ -370,6 +370,15 @@ config RTC_DRV_EM3027
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This driver can also be built as a module. If so, the module
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will be called rtc-em3027.
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config RTC_DRV_RV3029C2
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tristate "Micro Crystal RTC"
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help
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If you say yes here you get support for the Micro Crystal
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RV3029-C2 RTC chips.
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This driver can also be built as a module. If so, the module
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will be called rtc-rv3029c2.
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endif # I2C
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comment "SPI RTC drivers"
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@ -83,6 +83,7 @@ obj-$(CONFIG_RTC_DRV_RP5C01) += rtc-rp5c01.o
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obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o
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obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o
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obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o
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obj-$(CONFIG_RTC_DRV_RV3029C2) += rtc-rv3029c2.o
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obj-$(CONFIG_RTC_DRV_RX8025) += rtc-rx8025.o
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obj-$(CONFIG_RTC_DRV_RX8581) += rtc-rx8581.o
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obj-$(CONFIG_RTC_DRV_S35390A) += rtc-s35390a.o
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454
drivers/rtc/rtc-rv3029c2.c
Normal file
454
drivers/rtc/rtc-rv3029c2.c
Normal file
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@ -0,0 +1,454 @@
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/*
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* Micro Crystal RV-3029C2 rtc class driver
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*
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* Author: Gregory Hermant <gregory.hermant@calao-systems.com>
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*
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* based on previously existing rtc class drivers
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* NOTE: Currently this driver only supports the bare minimum for read
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* and write the RTC and alarms. The extra features provided by this chip
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* (trickle charger, eeprom, T° compensation) are unavailable.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/bcd.h>
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#include <linux/rtc.h>
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/* Register map */
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/* control section */
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#define RV3029C2_ONOFF_CTRL 0x00
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#define RV3029C2_IRQ_CTRL 0x01
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#define RV3029C2_IRQ_CTRL_AIE (1 << 0)
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#define RV3029C2_IRQ_FLAGS 0x02
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#define RV3029C2_IRQ_FLAGS_AF (1 << 0)
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#define RV3029C2_STATUS 0x03
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#define RV3029C2_STATUS_VLOW1 (1 << 2)
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#define RV3029C2_STATUS_VLOW2 (1 << 3)
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#define RV3029C2_STATUS_SR (1 << 4)
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#define RV3029C2_STATUS_PON (1 << 5)
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#define RV3029C2_STATUS_EEBUSY (1 << 7)
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#define RV3029C2_RST_CTRL 0x04
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#define RV3029C2_CONTROL_SECTION_LEN 0x05
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/* watch section */
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#define RV3029C2_W_SEC 0x08
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#define RV3029C2_W_MINUTES 0x09
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#define RV3029C2_W_HOURS 0x0A
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#define RV3029C2_REG_HR_12_24 (1<<6) /* 24h/12h mode */
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#define RV3029C2_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */
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#define RV3029C2_W_DATE 0x0B
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#define RV3029C2_W_DAYS 0x0C
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#define RV3029C2_W_MONTHS 0x0D
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#define RV3029C2_W_YEARS 0x0E
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#define RV3029C2_WATCH_SECTION_LEN 0x07
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/* alarm section */
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#define RV3029C2_A_SC 0x10
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#define RV3029C2_A_MN 0x11
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#define RV3029C2_A_HR 0x12
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#define RV3029C2_A_DT 0x13
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#define RV3029C2_A_DW 0x14
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#define RV3029C2_A_MO 0x15
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#define RV3029C2_A_YR 0x16
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#define RV3029C2_ALARM_SECTION_LEN 0x07
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/* timer section */
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#define RV3029C2_TIMER_LOW 0x18
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#define RV3029C2_TIMER_HIGH 0x19
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/* temperature section */
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#define RV3029C2_TEMP_PAGE 0x20
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/* eeprom data section */
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#define RV3029C2_E2P_EEDATA1 0x28
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#define RV3029C2_E2P_EEDATA2 0x29
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/* eeprom control section */
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#define RV3029C2_CONTROL_E2P_EECTRL 0x30
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#define RV3029C2_TRICKLE_1K (1<<0) /* 1K resistance */
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#define RV3029C2_TRICKLE_5K (1<<1) /* 5K resistance */
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#define RV3029C2_TRICKLE_20K (1<<2) /* 20K resistance */
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#define RV3029C2_TRICKLE_80K (1<<3) /* 80K resistance */
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#define RV3029C2_CONTROL_E2P_XTALOFFSET 0x31
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#define RV3029C2_CONTROL_E2P_QCOEF 0x32
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#define RV3029C2_CONTROL_E2P_TURNOVER 0x33
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/* user ram section */
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#define RV3029C2_USR1_RAM_PAGE 0x38
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#define RV3029C2_USR1_SECTION_LEN 0x04
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#define RV3029C2_USR2_RAM_PAGE 0x3C
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#define RV3029C2_USR2_SECTION_LEN 0x04
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static int
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rv3029c2_i2c_read_regs(struct i2c_client *client, u8 reg, u8 *buf,
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unsigned len)
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{
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int ret;
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if ((reg > RV3029C2_USR1_RAM_PAGE + 7) ||
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(reg + len > RV3029C2_USR1_RAM_PAGE + 8))
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return -EINVAL;
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ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf);
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if (ret < 0)
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return ret;
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if (ret < len)
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return -EIO;
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return 0;
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}
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static int
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rv3029c2_i2c_write_regs(struct i2c_client *client, u8 reg, u8 const buf[],
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unsigned len)
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{
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if ((reg > RV3029C2_USR1_RAM_PAGE + 7) ||
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(reg + len > RV3029C2_USR1_RAM_PAGE + 8))
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return -EINVAL;
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return i2c_smbus_write_i2c_block_data(client, reg, len, buf);
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}
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static int
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rv3029c2_i2c_get_sr(struct i2c_client *client, u8 *buf)
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{
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int ret = rv3029c2_i2c_read_regs(client, RV3029C2_STATUS, buf, 1);
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if (ret < 0)
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return -EIO;
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dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
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return 0;
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}
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static int
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rv3029c2_i2c_set_sr(struct i2c_client *client, u8 val)
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{
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u8 buf[1];
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int sr;
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buf[0] = val;
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sr = rv3029c2_i2c_write_regs(client, RV3029C2_STATUS, buf, 1);
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dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
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if (sr < 0)
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return -EIO;
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return 0;
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}
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static int
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rv3029c2_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
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{
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u8 buf[1];
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int ret;
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u8 regs[RV3029C2_WATCH_SECTION_LEN] = { 0, };
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ret = rv3029c2_i2c_get_sr(client, buf);
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if (ret < 0) {
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dev_err(&client->dev, "%s: reading SR failed\n", __func__);
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return -EIO;
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}
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ret = rv3029c2_i2c_read_regs(client, RV3029C2_W_SEC , regs,
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RV3029C2_WATCH_SECTION_LEN);
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if (ret < 0) {
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dev_err(&client->dev, "%s: reading RTC section failed\n",
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__func__);
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return ret;
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}
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tm->tm_sec = bcd2bin(regs[RV3029C2_W_SEC-RV3029C2_W_SEC]);
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tm->tm_min = bcd2bin(regs[RV3029C2_W_MINUTES-RV3029C2_W_SEC]);
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/* HR field has a more complex interpretation */
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{
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const u8 _hr = regs[RV3029C2_W_HOURS-RV3029C2_W_SEC];
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if (_hr & RV3029C2_REG_HR_12_24) {
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/* 12h format */
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tm->tm_hour = bcd2bin(_hr & 0x1f);
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if (_hr & RV3029C2_REG_HR_PM) /* PM flag set */
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tm->tm_hour += 12;
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} else /* 24h format */
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tm->tm_hour = bcd2bin(_hr & 0x3f);
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}
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tm->tm_mday = bcd2bin(regs[RV3029C2_W_DATE-RV3029C2_W_SEC]);
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tm->tm_mon = bcd2bin(regs[RV3029C2_W_MONTHS-RV3029C2_W_SEC]) - 1;
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tm->tm_year = bcd2bin(regs[RV3029C2_W_YEARS-RV3029C2_W_SEC]) + 100;
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tm->tm_wday = bcd2bin(regs[RV3029C2_W_DAYS-RV3029C2_W_SEC]) - 1;
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return 0;
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}
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static int rv3029c2_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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return rv3029c2_i2c_read_time(to_i2c_client(dev), tm);
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}
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static int
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rv3029c2_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
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{
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struct rtc_time *const tm = &alarm->time;
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int ret;
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u8 regs[8];
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ret = rv3029c2_i2c_get_sr(client, regs);
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if (ret < 0) {
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dev_err(&client->dev, "%s: reading SR failed\n", __func__);
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return -EIO;
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}
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ret = rv3029c2_i2c_read_regs(client, RV3029C2_A_SC, regs,
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RV3029C2_ALARM_SECTION_LEN);
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if (ret < 0) {
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dev_err(&client->dev, "%s: reading alarm section failed\n",
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__func__);
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return ret;
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}
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tm->tm_sec = bcd2bin(regs[RV3029C2_A_SC-RV3029C2_A_SC] & 0x7f);
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tm->tm_min = bcd2bin(regs[RV3029C2_A_MN-RV3029C2_A_SC] & 0x7f);
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tm->tm_hour = bcd2bin(regs[RV3029C2_A_HR-RV3029C2_A_SC] & 0x3f);
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tm->tm_mday = bcd2bin(regs[RV3029C2_A_DT-RV3029C2_A_SC] & 0x3f);
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tm->tm_mon = bcd2bin(regs[RV3029C2_A_MO-RV3029C2_A_SC] & 0x1f) - 1;
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tm->tm_year = bcd2bin(regs[RV3029C2_A_YR-RV3029C2_A_SC] & 0x7f) + 100;
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tm->tm_wday = bcd2bin(regs[RV3029C2_A_DW-RV3029C2_A_SC] & 0x07) - 1;
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return 0;
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}
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static int
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rv3029c2_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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return rv3029c2_i2c_read_alarm(to_i2c_client(dev), alarm);
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}
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static int rv3029c2_rtc_i2c_alarm_set_irq(struct i2c_client *client,
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int enable)
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{
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int ret;
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u8 buf[1];
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/* enable AIE irq */
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ret = rv3029c2_i2c_read_regs(client, RV3029C2_IRQ_CTRL, buf, 1);
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if (ret < 0) {
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dev_err(&client->dev, "can't read INT reg\n");
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return ret;
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}
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if (enable)
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buf[0] |= RV3029C2_IRQ_CTRL_AIE;
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else
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buf[0] &= ~RV3029C2_IRQ_CTRL_AIE;
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ret = rv3029c2_i2c_write_regs(client, RV3029C2_IRQ_CTRL, buf, 1);
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if (ret < 0) {
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dev_err(&client->dev, "can't set INT reg\n");
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return ret;
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}
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return 0;
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}
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static int rv3029c2_rtc_i2c_set_alarm(struct i2c_client *client,
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struct rtc_wkalrm *alarm)
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{
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struct rtc_time *const tm = &alarm->time;
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int ret;
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u8 regs[8];
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/*
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* The clock has an 8 bit wide bcd-coded register (they never learn)
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* for the year. tm_year is an offset from 1900 and we are interested
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* in the 2000-2099 range, so any value less than 100 is invalid.
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*/
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if (tm->tm_year < 100)
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return -EINVAL;
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ret = rv3029c2_i2c_get_sr(client, regs);
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if (ret < 0) {
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dev_err(&client->dev, "%s: reading SR failed\n", __func__);
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return -EIO;
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}
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regs[RV3029C2_A_SC-RV3029C2_A_SC] = bin2bcd(tm->tm_sec & 0x7f);
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regs[RV3029C2_A_MN-RV3029C2_A_SC] = bin2bcd(tm->tm_min & 0x7f);
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regs[RV3029C2_A_HR-RV3029C2_A_SC] = bin2bcd(tm->tm_hour & 0x3f);
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regs[RV3029C2_A_DT-RV3029C2_A_SC] = bin2bcd(tm->tm_mday & 0x3f);
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regs[RV3029C2_A_MO-RV3029C2_A_SC] = bin2bcd((tm->tm_mon & 0x1f) - 1);
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regs[RV3029C2_A_DW-RV3029C2_A_SC] = bin2bcd((tm->tm_wday & 7) - 1);
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regs[RV3029C2_A_YR-RV3029C2_A_SC] = bin2bcd((tm->tm_year & 0x7f) - 100);
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ret = rv3029c2_i2c_write_regs(client, RV3029C2_A_SC, regs,
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RV3029C2_ALARM_SECTION_LEN);
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if (ret < 0)
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return ret;
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if (alarm->enabled) {
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u8 buf[1];
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/* clear AF flag */
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ret = rv3029c2_i2c_read_regs(client, RV3029C2_IRQ_FLAGS,
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buf, 1);
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if (ret < 0) {
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dev_err(&client->dev, "can't read alarm flag\n");
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return ret;
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}
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buf[0] &= ~RV3029C2_IRQ_FLAGS_AF;
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ret = rv3029c2_i2c_write_regs(client, RV3029C2_IRQ_FLAGS,
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buf, 1);
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if (ret < 0) {
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dev_err(&client->dev, "can't set alarm flag\n");
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return ret;
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}
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/* enable AIE irq */
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ret = rv3029c2_rtc_i2c_alarm_set_irq(client, 1);
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if (ret)
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return ret;
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dev_dbg(&client->dev, "alarm IRQ armed\n");
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} else {
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/* disable AIE irq */
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ret = rv3029c2_rtc_i2c_alarm_set_irq(client, 1);
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if (ret)
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return ret;
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dev_dbg(&client->dev, "alarm IRQ disabled\n");
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}
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return 0;
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}
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static int rv3029c2_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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return rv3029c2_rtc_i2c_set_alarm(to_i2c_client(dev), alarm);
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}
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static int
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rv3029c2_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
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{
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u8 regs[8];
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int ret;
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/*
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* The clock has an 8 bit wide bcd-coded register (they never learn)
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* for the year. tm_year is an offset from 1900 and we are interested
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* in the 2000-2099 range, so any value less than 100 is invalid.
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*/
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if (tm->tm_year < 100)
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return -EINVAL;
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regs[RV3029C2_W_SEC-RV3029C2_W_SEC] = bin2bcd(tm->tm_sec);
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regs[RV3029C2_W_MINUTES-RV3029C2_W_SEC] = bin2bcd(tm->tm_min);
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regs[RV3029C2_W_HOURS-RV3029C2_W_SEC] = bin2bcd(tm->tm_hour);
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regs[RV3029C2_W_DATE-RV3029C2_W_SEC] = bin2bcd(tm->tm_mday);
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regs[RV3029C2_W_MONTHS-RV3029C2_W_SEC] = bin2bcd(tm->tm_mon+1);
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regs[RV3029C2_W_DAYS-RV3029C2_W_SEC] = bin2bcd((tm->tm_wday & 7)+1);
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regs[RV3029C2_W_YEARS-RV3029C2_W_SEC] = bin2bcd(tm->tm_year - 100);
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ret = rv3029c2_i2c_write_regs(client, RV3029C2_W_SEC, regs,
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RV3029C2_WATCH_SECTION_LEN);
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if (ret < 0)
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return ret;
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ret = rv3029c2_i2c_get_sr(client, regs);
|
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if (ret < 0) {
|
||||
dev_err(&client->dev, "%s: reading SR failed\n", __func__);
|
||||
return ret;
|
||||
}
|
||||
/* clear PON bit */
|
||||
ret = rv3029c2_i2c_set_sr(client, (regs[0] & ~RV3029C2_STATUS_PON));
|
||||
if (ret < 0) {
|
||||
dev_err(&client->dev, "%s: reading SR failed\n", __func__);
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int rv3029c2_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
||||
{
|
||||
return rv3029c2_i2c_set_time(to_i2c_client(dev), tm);
|
||||
}
|
||||
|
||||
static const struct rtc_class_ops rv3029c2_rtc_ops = {
|
||||
.read_time = rv3029c2_rtc_read_time,
|
||||
.set_time = rv3029c2_rtc_set_time,
|
||||
.read_alarm = rv3029c2_rtc_read_alarm,
|
||||
.set_alarm = rv3029c2_rtc_set_alarm,
|
||||
};
|
||||
|
||||
static struct i2c_device_id rv3029c2_id[] = {
|
||||
{ "rv3029c2", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, rv3029c2_id);
|
||||
|
||||
static int __devinit
|
||||
rv3029c2_probe(struct i2c_client *client, const struct i2c_device_id *id)
|
||||
{
|
||||
struct rtc_device *rtc;
|
||||
int rc = 0;
|
||||
u8 buf[1];
|
||||
|
||||
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_EMUL))
|
||||
return -ENODEV;
|
||||
|
||||
rtc = rtc_device_register(client->name,
|
||||
&client->dev, &rv3029c2_rtc_ops,
|
||||
THIS_MODULE);
|
||||
|
||||
if (IS_ERR(rtc))
|
||||
return PTR_ERR(rtc);
|
||||
|
||||
i2c_set_clientdata(client, rtc);
|
||||
|
||||
rc = rv3029c2_i2c_get_sr(client, buf);
|
||||
if (rc < 0) {
|
||||
dev_err(&client->dev, "reading status failed\n");
|
||||
goto exit_unregister;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
exit_unregister:
|
||||
rtc_device_unregister(rtc);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int __devexit rv3029c2_remove(struct i2c_client *client)
|
||||
{
|
||||
struct rtc_device *rtc = i2c_get_clientdata(client);
|
||||
|
||||
rtc_device_unregister(rtc);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct i2c_driver rv3029c2_driver = {
|
||||
.driver = {
|
||||
.name = "rtc-rv3029c2",
|
||||
},
|
||||
.probe = rv3029c2_probe,
|
||||
.remove = __devexit_p(rv3029c2_remove),
|
||||
.id_table = rv3029c2_id,
|
||||
};
|
||||
|
||||
static int __init rv3029c2_init(void)
|
||||
{
|
||||
return i2c_add_driver(&rv3029c2_driver);
|
||||
}
|
||||
|
||||
static void __exit rv3029c2_exit(void)
|
||||
{
|
||||
i2c_del_driver(&rv3029c2_driver);
|
||||
}
|
||||
|
||||
module_init(rv3029c2_init);
|
||||
module_exit(rv3029c2_exit);
|
||||
|
||||
MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
|
||||
MODULE_DESCRIPTION("Micro Crystal RV3029C2 RTC driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in a new issue