[PATCH] RTC subsystem, Add ISL1208 support
Add support for the I2C-attached Intersil ISL1208 RTC chip. [akpm@osdl.org: cleanups, fixlets] Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Herbert Valerio Riedel
Linus Torvalds
parent
bef317e364
commit
7e56a7dcbb
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@ -121,6 +121,16 @@ config RTC_DRV_DS1553
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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-ds1553.
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config RTC_DRV_ISL1208
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tristate "Intersil 1208"
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depends on RTC_CLASS && I2C
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help
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If you say yes here you get support for the
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Intersil 1208 RTC chip.
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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-isl1208.
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config RTC_DRV_DS1672
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tristate "Dallas/Maxim DS1672"
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depends on RTC_CLASS && I2C
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@ -12,6 +12,7 @@ obj-$(CONFIG_RTC_INTF_PROC) += rtc-proc.o
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obj-$(CONFIG_RTC_INTF_DEV) += rtc-dev.o
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obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o
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obj-$(CONFIG_RTC_DRV_ISL1208) += rtc-isl1208.o
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obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o
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obj-$(CONFIG_RTC_DRV_DS1307) += rtc-ds1307.o
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obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o
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@ -0,0 +1,591 @@
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/*
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* Intersil ISL1208 rtc class driver
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*
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* Copyright 2005,2006 Hebert Valerio Riedel <hvr@gnu.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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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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#define DRV_NAME "isl1208"
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#define DRV_VERSION "0.2"
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/* Register map */
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/* rtc section */
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#define ISL1208_REG_SC 0x00
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#define ISL1208_REG_MN 0x01
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#define ISL1208_REG_HR 0x02
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#define ISL1208_REG_HR_MIL (1<<7) /* 24h/12h mode */
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#define ISL1208_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */
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#define ISL1208_REG_DT 0x03
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#define ISL1208_REG_MO 0x04
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#define ISL1208_REG_YR 0x05
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#define ISL1208_REG_DW 0x06
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#define ISL1208_RTC_SECTION_LEN 7
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/* control/status section */
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#define ISL1208_REG_SR 0x07
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#define ISL1208_REG_SR_ARST (1<<7) /* auto reset */
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#define ISL1208_REG_SR_XTOSCB (1<<6) /* crystal oscillator */
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#define ISL1208_REG_SR_WRTC (1<<4) /* write rtc */
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#define ISL1208_REG_SR_ALM (1<<2) /* alarm */
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#define ISL1208_REG_SR_BAT (1<<1) /* battery */
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#define ISL1208_REG_SR_RTCF (1<<0) /* rtc fail */
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#define ISL1208_REG_INT 0x08
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#define ISL1208_REG_09 0x09 /* reserved */
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#define ISL1208_REG_ATR 0x0a
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#define ISL1208_REG_DTR 0x0b
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/* alarm section */
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#define ISL1208_REG_SCA 0x0c
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#define ISL1208_REG_MNA 0x0d
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#define ISL1208_REG_HRA 0x0e
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#define ISL1208_REG_DTA 0x0f
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#define ISL1208_REG_MOA 0x10
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#define ISL1208_REG_DWA 0x11
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#define ISL1208_ALARM_SECTION_LEN 6
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/* user section */
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#define ISL1208_REG_USR1 0x12
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#define ISL1208_REG_USR2 0x13
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#define ISL1208_USR_SECTION_LEN 2
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/* i2c configuration */
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#define ISL1208_I2C_ADDR 0xde
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static unsigned short normal_i2c[] = {
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ISL1208_I2C_ADDR>>1, I2C_CLIENT_END
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};
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I2C_CLIENT_INSMOD; /* defines addr_data */
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static int isl1208_attach_adapter(struct i2c_adapter *adapter);
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static int isl1208_detach_client(struct i2c_client *client);
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static struct i2c_driver isl1208_driver = {
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.driver = {
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.name = DRV_NAME,
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},
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.id = I2C_DRIVERID_ISL1208,
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.attach_adapter = &isl1208_attach_adapter,
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.detach_client = &isl1208_detach_client,
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};
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/* block read */
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static int
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isl1208_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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u8 reg_addr[1] = { reg };
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struct i2c_msg msgs[2] = {
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{ client->addr, client->flags, sizeof(reg_addr), reg_addr },
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{ client->addr, client->flags | I2C_M_RD, len, buf }
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};
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int ret;
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BUG_ON(len == 0);
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BUG_ON(reg > ISL1208_REG_USR2);
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BUG_ON(reg + len > ISL1208_REG_USR2 + 1);
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ret = i2c_transfer(client->adapter, msgs, 2);
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if (ret > 0)
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ret = 0;
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return ret;
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}
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/* block write */
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static int
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isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[],
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unsigned len)
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{
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u8 i2c_buf[ISL1208_REG_USR2 + 2];
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struct i2c_msg msgs[1] = {
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{ client->addr, client->flags, len + 1, i2c_buf }
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};
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int ret;
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BUG_ON(len == 0);
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BUG_ON(reg > ISL1208_REG_USR2);
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BUG_ON(reg + len > ISL1208_REG_USR2 + 1);
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i2c_buf[0] = reg;
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memcpy(&i2c_buf[1], &buf[0], len);
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ret = i2c_transfer(client->adapter, msgs, 1);
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if (ret > 0)
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ret = 0;
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return ret;
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}
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/* simple check to see wether we have a isl1208 */
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static int isl1208_i2c_validate_client(struct i2c_client *client)
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{
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u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
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u8 zero_mask[ISL1208_RTC_SECTION_LEN] = {
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0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8
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};
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int i;
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int ret;
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ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
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if (ret < 0)
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return ret;
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for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) {
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if (regs[i] & zero_mask[i]) /* check if bits are cleared */
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return -ENODEV;
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}
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return 0;
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}
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static int isl1208_i2c_get_sr(struct i2c_client *client)
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{
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return i2c_smbus_read_byte_data(client, ISL1208_REG_SR) == -1 ? -EIO:0;
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}
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static int isl1208_i2c_get_atr(struct i2c_client *client)
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{
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int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR);
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if (atr < 0)
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return -EIO;
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/* The 6bit value in the ATR register controls the load
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* capacitance C_load * in steps of 0.25pF
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*
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* bit (1<<5) of the ATR register is inverted
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*
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* C_load(ATR=0x20) = 4.50pF
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* C_load(ATR=0x00) = 12.50pF
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* C_load(ATR=0x1f) = 20.25pF
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*
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*/
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atr &= 0x3f; /* mask out lsb */
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atr ^= 1<<5; /* invert 6th bit */
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atr += 2*9; /* add offset of 4.5pF; unit[atr] = 0.25pF */
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return atr;
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}
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static int isl1208_i2c_get_dtr(struct i2c_client *client)
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{
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int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR);
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if (dtr < 0)
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return -EIO;
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/* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */
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dtr = ((dtr & 0x3) * 20) * (dtr & (1<<2) ? -1 : 1);
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return dtr;
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}
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static int isl1208_i2c_get_usr(struct i2c_client *client)
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{
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u8 buf[ISL1208_USR_SECTION_LEN] = { 0, };
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int ret;
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ret = isl1208_i2c_read_regs (client, ISL1208_REG_USR1, buf,
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ISL1208_USR_SECTION_LEN);
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if (ret < 0)
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return ret;
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return (buf[1] << 8) | buf[0];
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}
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static int isl1208_i2c_set_usr(struct i2c_client *client, u16 usr)
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{
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u8 buf[ISL1208_USR_SECTION_LEN];
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buf[0] = usr & 0xff;
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buf[1] = (usr >> 8) & 0xff;
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return isl1208_i2c_set_regs (client, ISL1208_REG_USR1, buf,
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ISL1208_USR_SECTION_LEN);
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}
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static int isl1208_rtc_proc(struct device *dev, struct seq_file *seq)
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{
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struct i2c_client *const client = to_i2c_client(dev);
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int sr, dtr, atr, usr;
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sr = isl1208_i2c_get_sr(client);
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if (sr < 0) {
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dev_err(&client->dev, "%s: reading SR failed\n", __func__);
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return sr;
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}
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seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n",
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(sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "",
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(sr & ISL1208_REG_SR_BAT) ? " BAT" : "",
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(sr & ISL1208_REG_SR_ALM) ? " ALM" : "",
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(sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "",
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(sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "",
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(sr & ISL1208_REG_SR_ARST) ? " ARST" : "",
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sr);
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seq_printf(seq, "batt_status\t: %s\n",
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(sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay");
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dtr = isl1208_i2c_get_dtr(client);
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if (dtr >= 0 -1)
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seq_printf(seq, "digital_trim\t: %d ppm\n", dtr);
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atr = isl1208_i2c_get_atr(client);
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if (atr >= 0)
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seq_printf(seq, "analog_trim\t: %d.%.2d pF\n",
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atr>>2, (atr&0x3)*25);
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usr = isl1208_i2c_get_usr(client);
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if (usr >= 0)
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seq_printf(seq, "user_data\t: 0x%.4x\n", usr);
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return 0;
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}
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static int isl1208_i2c_read_time(struct i2c_client *client,
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struct rtc_time *tm)
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{
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int sr;
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u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
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sr = isl1208_i2c_get_sr(client);
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if (sr < 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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sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
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if (sr < 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 sr;
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}
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tm->tm_sec = BCD2BIN(regs[ISL1208_REG_SC]);
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tm->tm_min = BCD2BIN(regs[ISL1208_REG_MN]);
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{ /* HR field has a more complex interpretation */
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const u8 _hr = regs[ISL1208_REG_HR];
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if (_hr & ISL1208_REG_HR_MIL) /* 24h format */
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tm->tm_hour = BCD2BIN(_hr & 0x3f);
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else { // 12h format
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tm->tm_hour = BCD2BIN(_hr & 0x1f);
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if (_hr & ISL1208_REG_HR_PM) /* PM flag set */
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tm->tm_hour += 12;
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}
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}
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tm->tm_mday = BCD2BIN(regs[ISL1208_REG_DT]);
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tm->tm_mon = BCD2BIN(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */
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tm->tm_year = BCD2BIN(regs[ISL1208_REG_YR]) + 100;
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tm->tm_wday = BCD2BIN(regs[ISL1208_REG_DW]);
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return 0;
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}
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static int isl1208_i2c_read_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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u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
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int sr;
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sr = isl1208_i2c_get_sr(client);
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if (sr < 0) {
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dev_err(&client->dev, "%s: reading SR failed\n", __func__);
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return sr;
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}
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sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs,
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ISL1208_ALARM_SECTION_LEN);
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if (sr < 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 sr;
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}
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/* MSB of each alarm register is an enable bit */
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tm->tm_sec = BCD2BIN(regs[ISL1208_REG_SCA-ISL1208_REG_SCA] & 0x7f);
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tm->tm_min = BCD2BIN(regs[ISL1208_REG_MNA-ISL1208_REG_SCA] & 0x7f);
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tm->tm_hour = BCD2BIN(regs[ISL1208_REG_HRA-ISL1208_REG_SCA] & 0x3f);
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tm->tm_mday = BCD2BIN(regs[ISL1208_REG_DTA-ISL1208_REG_SCA] & 0x3f);
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tm->tm_mon = BCD2BIN(regs[ISL1208_REG_MOA-ISL1208_REG_SCA] & 0x1f)-1;
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tm->tm_wday = BCD2BIN(regs[ISL1208_REG_DWA-ISL1208_REG_SCA] & 0x03);
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return 0;
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}
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static int isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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return isl1208_i2c_read_time(to_i2c_client(dev), tm);
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}
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static int isl1208_i2c_set_time(struct i2c_client *client,
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struct rtc_time const *tm)
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{
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int sr;
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u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
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regs[ISL1208_REG_SC] = BIN2BCD(tm->tm_sec);
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regs[ISL1208_REG_MN] = BIN2BCD(tm->tm_min);
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regs[ISL1208_REG_HR] = BIN2BCD(tm->tm_hour) | ISL1208_REG_HR_MIL;
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regs[ISL1208_REG_DT] = BIN2BCD(tm->tm_mday);
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regs[ISL1208_REG_MO] = BIN2BCD(tm->tm_mon + 1);
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regs[ISL1208_REG_YR] = BIN2BCD(tm->tm_year - 100);
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regs[ISL1208_REG_DW] = BIN2BCD(tm->tm_wday & 7);
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sr = isl1208_i2c_get_sr(client);
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if (sr < 0) {
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dev_err(&client->dev, "%s: reading SR failed\n", __func__);
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return sr;
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}
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/* set WRTC */
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sr = i2c_smbus_write_byte_data (client, ISL1208_REG_SR,
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sr | ISL1208_REG_SR_WRTC);
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if (sr < 0) {
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dev_err(&client->dev, "%s: writing SR failed\n", __func__);
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return sr;
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}
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/* write RTC registers */
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sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
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if (sr < 0) {
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dev_err(&client->dev, "%s: writing RTC section failed\n",
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__func__);
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return sr;
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}
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/* clear WRTC again */
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sr = i2c_smbus_write_byte_data (client, ISL1208_REG_SR,
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sr & ~ISL1208_REG_SR_WRTC);
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if (sr < 0) {
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dev_err(&client->dev, "%s: writing SR failed\n", __func__);
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return sr;
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}
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return 0;
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}
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|
||||
static int isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
||||
{
|
||||
return isl1208_i2c_set_time(to_i2c_client(dev), tm);
|
||||
}
|
||||
|
||||
static int isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
|
||||
{
|
||||
return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm);
|
||||
}
|
||||
|
||||
static struct rtc_class_ops isl1208_rtc_ops = {
|
||||
.proc = isl1208_rtc_proc,
|
||||
.read_time = isl1208_rtc_read_time,
|
||||
.set_time = isl1208_rtc_set_time,
|
||||
.read_alarm = isl1208_rtc_read_alarm,
|
||||
//.set_alarm = isl1208_rtc_set_alarm,
|
||||
};
|
||||
|
||||
/* sysfs interface */
|
||||
|
||||
static ssize_t isl1208_sysfs_show_atrim(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
int atr;
|
||||
|
||||
atr = isl1208_i2c_get_atr(to_i2c_client(dev));
|
||||
if (atr < 0)
|
||||
return atr;
|
||||
|
||||
return sprintf(buf, "%d.%.2d pF\n", atr>>2, (atr&0x3)*25);
|
||||
}
|
||||
static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL);
|
||||
|
||||
static ssize_t isl1208_sysfs_show_dtrim(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
int dtr;
|
||||
|
||||
dtr = isl1208_i2c_get_dtr(to_i2c_client(dev));
|
||||
if (dtr < 0)
|
||||
return dtr;
|
||||
|
||||
return sprintf(buf, "%d ppm\n", dtr);
|
||||
}
|
||||
static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL);
|
||||
|
||||
static ssize_t isl1208_sysfs_show_usr(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
int usr;
|
||||
|
||||
usr = isl1208_i2c_get_usr(to_i2c_client(dev));
|
||||
if (usr < 0)
|
||||
return usr;
|
||||
|
||||
return sprintf(buf, "0x%.4x\n", usr);
|
||||
}
|
||||
|
||||
static ssize_t isl1208_sysfs_store_usr(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
int usr = -1;
|
||||
|
||||
if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) {
|
||||
if (sscanf(buf, "%x", &usr) != 1)
|
||||
return -EINVAL;
|
||||
} else {
|
||||
if (sscanf(buf, "%d", &usr) != 1)
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (usr < 0 || usr > 0xffff)
|
||||
return -EINVAL;
|
||||
|
||||
return isl1208_i2c_set_usr(to_i2c_client(dev), usr) ? -EIO : count;
|
||||
}
|
||||
static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr,
|
||||
isl1208_sysfs_store_usr);
|
||||
|
||||
static int
|
||||
isl1208_probe(struct i2c_adapter *adapter, int addr, int kind)
|
||||
{
|
||||
int rc = 0;
|
||||
struct i2c_client *new_client = NULL;
|
||||
struct rtc_device *rtc = NULL;
|
||||
|
||||
if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
|
||||
rc = -ENODEV;
|
||||
goto failout;
|
||||
}
|
||||
|
||||
new_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
|
||||
if (new_client == NULL) {
|
||||
rc = -ENOMEM;
|
||||
goto failout;
|
||||
}
|
||||
|
||||
new_client->addr = addr;
|
||||
new_client->adapter = adapter;
|
||||
new_client->driver = &isl1208_driver;
|
||||
new_client->flags = 0;
|
||||
strcpy(new_client->name, DRV_NAME);
|
||||
|
||||
if (kind < 0) {
|
||||
rc = isl1208_i2c_validate_client(new_client);
|
||||
if (rc < 0)
|
||||
goto failout;
|
||||
}
|
||||
|
||||
rc = i2c_attach_client(new_client);
|
||||
if (rc < 0)
|
||||
goto failout;
|
||||
|
||||
dev_info(&new_client->dev,
|
||||
"chip found, driver version " DRV_VERSION "\n");
|
||||
|
||||
rtc = rtc_device_register(isl1208_driver.driver.name,
|
||||
&new_client->dev,
|
||||
&isl1208_rtc_ops, THIS_MODULE);
|
||||
|
||||
if (IS_ERR(rtc)) {
|
||||
rc = PTR_ERR(rtc);
|
||||
goto failout_detach;
|
||||
}
|
||||
|
||||
i2c_set_clientdata(new_client, rtc);
|
||||
|
||||
rc = isl1208_i2c_get_sr(new_client);
|
||||
if (rc < 0) {
|
||||
dev_err(&new_client->dev, "reading status failed\n");
|
||||
goto failout_unregister;
|
||||
}
|
||||
|
||||
if (rc & ISL1208_REG_SR_RTCF)
|
||||
dev_warn(&new_client->dev, "rtc power failure detected, "
|
||||
"please set clock.\n");
|
||||
|
||||
rc = device_create_file(&new_client->dev, &dev_attr_atrim);
|
||||
if (rc < 0)
|
||||
goto failout_unregister;
|
||||
rc = device_create_file(&new_client->dev, &dev_attr_dtrim);
|
||||
if (rc < 0)
|
||||
goto failout_atrim;
|
||||
rc = device_create_file(&new_client->dev, &dev_attr_usr);
|
||||
if (rc < 0)
|
||||
goto failout_dtrim;
|
||||
|
||||
return 0;
|
||||
|
||||
failout_dtrim:
|
||||
device_remove_file(&new_client->dev, &dev_attr_dtrim);
|
||||
failout_atrim:
|
||||
device_remove_file(&new_client->dev, &dev_attr_atrim);
|
||||
failout_unregister:
|
||||
rtc_device_unregister(rtc);
|
||||
failout_detach:
|
||||
i2c_detach_client(new_client);
|
||||
failout:
|
||||
kfree(new_client);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int
|
||||
isl1208_attach_adapter (struct i2c_adapter *adapter)
|
||||
{
|
||||
return i2c_probe(adapter, &addr_data, isl1208_probe);
|
||||
}
|
||||
|
||||
static int
|
||||
isl1208_detach_client(struct i2c_client *client)
|
||||
{
|
||||
int rc;
|
||||
struct rtc_device *const rtc = i2c_get_clientdata(client);
|
||||
|
||||
if (rtc)
|
||||
rtc_device_unregister(rtc); /* do we need to kfree? */
|
||||
|
||||
rc = i2c_detach_client(client);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
kfree(client);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* module management */
|
||||
|
||||
static int __init isl1208_init(void)
|
||||
{
|
||||
return i2c_add_driver(&isl1208_driver);
|
||||
}
|
||||
|
||||
static void __exit isl1208_exit(void)
|
||||
{
|
||||
i2c_del_driver(&isl1208_driver);
|
||||
}
|
||||
|
||||
MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>");
|
||||
MODULE_DESCRIPTION("Intersil ISL1208 RTC driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_VERSION(DRV_VERSION);
|
||||
|
||||
module_init(isl1208_init);
|
||||
module_exit(isl1208_exit);
|
||||
|
|
@ -115,6 +115,7 @@
|
|||
#define I2C_DRIVERID_BT866 85 /* Conexant bt866 video encoder */
|
||||
#define I2C_DRIVERID_KS0127 86 /* Samsung ks0127 video decoder */
|
||||
#define I2C_DRIVERID_TLV320AIC23B 87 /* TI TLV320AIC23B audio codec */
|
||||
#define I2C_DRIVERID_ISL1208 88 /* Intersil ISL1208 RTC */
|
||||
|
||||
#define I2C_DRIVERID_I2CDEV 900
|
||||
#define I2C_DRIVERID_ARP 902 /* SMBus ARP Client */
|
||||
|
|
|
|||
Loading…
Reference in New Issue