918 lines
23 KiB
C
918 lines
23 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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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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#include <linux/bcd.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/of_irq.h>
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#include <linux/rtc.h>
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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_EVT (1<<3) /* event */
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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_INT_ALME (1<<6) /* alarm enable */
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#define ISL1208_REG_INT_IM (1<<7) /* interrupt/alarm mode */
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#define ISL1219_REG_EV 0x09
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#define ISL1219_REG_EV_EVEN (1<<4) /* event detection enable */
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#define ISL1219_REG_EV_EVIENB (1<<7) /* event in pull-up disable */
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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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/* event section */
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#define ISL1219_REG_SCT 0x14
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#define ISL1219_REG_MNT 0x15
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#define ISL1219_REG_HRT 0x16
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#define ISL1219_REG_DTT 0x17
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#define ISL1219_REG_MOT 0x18
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#define ISL1219_REG_YRT 0x19
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#define ISL1219_EVT_SECTION_LEN 6
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static struct i2c_driver isl1208_driver;
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/* ISL1208 various variants */
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enum isl1208_id {
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TYPE_ISL1208 = 0,
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TYPE_ISL1209,
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TYPE_ISL1218,
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TYPE_ISL1219,
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ISL_LAST_ID
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};
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/* Chip capabilities table */
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static const struct isl1208_config {
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const char name[8];
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unsigned int nvmem_length;
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unsigned has_tamper:1;
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unsigned has_timestamp:1;
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} isl1208_configs[] = {
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[TYPE_ISL1208] = { "isl1208", 2, false, false },
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[TYPE_ISL1209] = { "isl1209", 2, true, false },
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[TYPE_ISL1218] = { "isl1218", 8, false, false },
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[TYPE_ISL1219] = { "isl1219", 2, true, true },
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};
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static const struct i2c_device_id isl1208_id[] = {
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{ "isl1208", TYPE_ISL1208 },
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{ "isl1209", TYPE_ISL1209 },
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{ "isl1218", TYPE_ISL1218 },
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{ "isl1219", TYPE_ISL1219 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, isl1208_id);
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static const __maybe_unused struct of_device_id isl1208_of_match[] = {
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{ .compatible = "isil,isl1208", .data = &isl1208_configs[TYPE_ISL1208] },
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{ .compatible = "isil,isl1209", .data = &isl1208_configs[TYPE_ISL1209] },
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{ .compatible = "isil,isl1218", .data = &isl1208_configs[TYPE_ISL1218] },
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{ .compatible = "isil,isl1219", .data = &isl1208_configs[TYPE_ISL1219] },
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{ }
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};
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MODULE_DEVICE_TABLE(of, isl1208_of_match);
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/* Device state */
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struct isl1208_state {
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struct nvmem_config nvmem_config;
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struct rtc_device *rtc;
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const struct isl1208_config *config;
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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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int ret;
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WARN_ON(reg > ISL1219_REG_YRT);
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WARN_ON(reg + len > ISL1219_REG_YRT + 1);
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ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf);
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return (ret < 0) ? ret : 0;
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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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int ret;
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WARN_ON(reg > ISL1219_REG_YRT);
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WARN_ON(reg + len > ISL1219_REG_YRT + 1);
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ret = i2c_smbus_write_i2c_block_data(client, reg, len, buf);
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return (ret < 0) ? ret : 0;
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}
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/* simple check to see whether we have a isl1208 */
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static int
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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
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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);
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}
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static int
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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 atr;
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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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/* returns adjustment value + 100 */
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static int
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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 + 100;
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}
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static int
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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
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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
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isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable)
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{
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int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
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if (icr < 0) {
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dev_err(&client->dev, "%s: reading INT failed\n", __func__);
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return icr;
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}
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if (enable)
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icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM;
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else
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icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM);
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icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr);
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if (icr < 0) {
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dev_err(&client->dev, "%s: writing INT failed\n", __func__);
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return icr;
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}
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return 0;
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}
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static int
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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" : "", 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)
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seq_printf(seq, "digital_trim\t: %d ppm\n", dtr - 100);
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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
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isl1208_i2c_read_time(struct i2c_client *client, 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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{
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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 {
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/* 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
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isl1208_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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u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
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int icr, yr, 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 =
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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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/* The alarm doesn't store the year so get it from the rtc section */
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yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR);
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if (yr < 0) {
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||
|
dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__);
|
||
|
return yr;
|
||
|
}
|
||
|
tm->tm_year = bcd2bin(yr) + 100;
|
||
|
|
||
|
icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
|
||
|
if (icr < 0) {
|
||
|
dev_err(&client->dev, "%s: reading INT failed\n", __func__);
|
||
|
return icr;
|
||
|
}
|
||
|
alarm->enabled = !!(icr & ISL1208_REG_INT_ALME);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
|
||
|
{
|
||
|
struct rtc_time *alarm_tm = &alarm->time;
|
||
|
u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
|
||
|
const int offs = ISL1208_REG_SCA;
|
||
|
struct rtc_time rtc_tm;
|
||
|
int err, enable;
|
||
|
|
||
|
err = isl1208_i2c_read_time(client, &rtc_tm);
|
||
|
if (err)
|
||
|
return err;
|
||
|
|
||
|
/* If the alarm time is before the current time disable the alarm */
|
||
|
if (!alarm->enabled || rtc_tm_sub(alarm_tm, &rtc_tm) <= 0)
|
||
|
enable = 0x00;
|
||
|
else
|
||
|
enable = 0x80;
|
||
|
|
||
|
/* Program the alarm and enable it for each setting */
|
||
|
regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable;
|
||
|
regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable;
|
||
|
regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) |
|
||
|
ISL1208_REG_HR_MIL | enable;
|
||
|
|
||
|
regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable;
|
||
|
regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable;
|
||
|
regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable;
|
||
|
|
||
|
/* write ALARM registers */
|
||
|
err = isl1208_i2c_set_regs(client, offs, regs,
|
||
|
ISL1208_ALARM_SECTION_LEN);
|
||
|
if (err < 0) {
|
||
|
dev_err(&client->dev, "%s: writing ALARM section failed\n",
|
||
|
__func__);
|
||
|
return err;
|
||
|
}
|
||
|
|
||
|
err = isl1208_rtc_toggle_alarm(client, enable);
|
||
|
if (err)
|
||
|
return err;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
||
|
{
|
||
|
return isl1208_i2c_read_time(to_i2c_client(dev), tm);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
|
||
|
{
|
||
|
int sr;
|
||
|
u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
|
||
|
|
||
|
/* The clock has an 8 bit wide bcd-coded register (they never learn)
|
||
|
* for the year. tm_year is an offset from 1900 and we are interested
|
||
|
* in the 2000-2099 range, so any value less than 100 is invalid.
|
||
|
*/
|
||
|
if (tm->tm_year < 100)
|
||
|
return -EINVAL;
|
||
|
|
||
|
regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec);
|
||
|
regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min);
|
||
|
regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL;
|
||
|
|
||
|
regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday);
|
||
|
regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1);
|
||
|
regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100);
|
||
|
|
||
|
regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7);
|
||
|
|
||
|
sr = isl1208_i2c_get_sr(client);
|
||
|
if (sr < 0) {
|
||
|
dev_err(&client->dev, "%s: reading SR failed\n", __func__);
|
||
|
return sr;
|
||
|
}
|
||
|
|
||
|
/* set WRTC */
|
||
|
sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
|
||
|
sr | ISL1208_REG_SR_WRTC);
|
||
|
if (sr < 0) {
|
||
|
dev_err(&client->dev, "%s: writing SR failed\n", __func__);
|
||
|
return sr;
|
||
|
}
|
||
|
|
||
|
/* write RTC registers */
|
||
|
sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
|
||
|
if (sr < 0) {
|
||
|
dev_err(&client->dev, "%s: writing RTC section failed\n",
|
||
|
__func__);
|
||
|
return sr;
|
||
|
}
|
||
|
|
||
|
/* clear WRTC again */
|
||
|
sr = isl1208_i2c_get_sr(client);
|
||
|
if (sr < 0) {
|
||
|
dev_err(&client->dev, "%s: reading SR failed\n", __func__);
|
||
|
return sr;
|
||
|
}
|
||
|
sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
|
||
|
sr & ~ISL1208_REG_SR_WRTC);
|
||
|
if (sr < 0) {
|
||
|
dev_err(&client->dev, "%s: writing SR failed\n", __func__);
|
||
|
return sr;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
|
||
|
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 int
|
||
|
isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
|
||
|
{
|
||
|
return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm);
|
||
|
}
|
||
|
|
||
|
static ssize_t timestamp0_store(struct device *dev,
|
||
|
struct device_attribute *attr,
|
||
|
const char *buf, size_t count)
|
||
|
{
|
||
|
struct i2c_client *client = to_i2c_client(dev->parent);
|
||
|
int sr;
|
||
|
|
||
|
sr = isl1208_i2c_get_sr(client);
|
||
|
if (sr < 0) {
|
||
|
dev_err(dev, "%s: reading SR failed\n", __func__);
|
||
|
return sr;
|
||
|
}
|
||
|
|
||
|
sr &= ~ISL1208_REG_SR_EVT;
|
||
|
|
||
|
sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);
|
||
|
if (sr < 0)
|
||
|
dev_err(dev, "%s: writing SR failed\n",
|
||
|
__func__);
|
||
|
|
||
|
return count;
|
||
|
};
|
||
|
|
||
|
static ssize_t timestamp0_show(struct device *dev,
|
||
|
struct device_attribute *attr, char *buf)
|
||
|
{
|
||
|
struct i2c_client *client = to_i2c_client(dev->parent);
|
||
|
u8 regs[ISL1219_EVT_SECTION_LEN] = { 0, };
|
||
|
struct rtc_time tm;
|
||
|
int sr;
|
||
|
|
||
|
sr = isl1208_i2c_get_sr(client);
|
||
|
if (sr < 0) {
|
||
|
dev_err(dev, "%s: reading SR failed\n", __func__);
|
||
|
return sr;
|
||
|
}
|
||
|
|
||
|
if (!(sr & ISL1208_REG_SR_EVT))
|
||
|
return 0;
|
||
|
|
||
|
sr = isl1208_i2c_read_regs(client, ISL1219_REG_SCT, regs,
|
||
|
ISL1219_EVT_SECTION_LEN);
|
||
|
if (sr < 0) {
|
||
|
dev_err(dev, "%s: reading event section failed\n",
|
||
|
__func__);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* MSB of each alarm register is an enable bit */
|
||
|
tm.tm_sec = bcd2bin(regs[ISL1219_REG_SCT - ISL1219_REG_SCT] & 0x7f);
|
||
|
tm.tm_min = bcd2bin(regs[ISL1219_REG_MNT - ISL1219_REG_SCT] & 0x7f);
|
||
|
tm.tm_hour = bcd2bin(regs[ISL1219_REG_HRT - ISL1219_REG_SCT] & 0x3f);
|
||
|
tm.tm_mday = bcd2bin(regs[ISL1219_REG_DTT - ISL1219_REG_SCT] & 0x3f);
|
||
|
tm.tm_mon =
|
||
|
bcd2bin(regs[ISL1219_REG_MOT - ISL1219_REG_SCT] & 0x1f) - 1;
|
||
|
tm.tm_year = bcd2bin(regs[ISL1219_REG_YRT - ISL1219_REG_SCT]) + 100;
|
||
|
|
||
|
sr = rtc_valid_tm(&tm);
|
||
|
if (sr)
|
||
|
return sr;
|
||
|
|
||
|
return sprintf(buf, "%llu\n",
|
||
|
(unsigned long long)rtc_tm_to_time64(&tm));
|
||
|
};
|
||
|
|
||
|
static DEVICE_ATTR_RW(timestamp0);
|
||
|
|
||
|
static irqreturn_t
|
||
|
isl1208_rtc_interrupt(int irq, void *data)
|
||
|
{
|
||
|
unsigned long timeout = jiffies + msecs_to_jiffies(1000);
|
||
|
struct i2c_client *client = data;
|
||
|
struct isl1208_state *isl1208 = i2c_get_clientdata(client);
|
||
|
int handled = 0, sr, err;
|
||
|
|
||
|
/*
|
||
|
* I2C reads get NAK'ed if we read straight away after an interrupt?
|
||
|
* Using a mdelay/msleep didn't seem to help either, so we work around
|
||
|
* this by continually trying to read the register for a short time.
|
||
|
*/
|
||
|
while (1) {
|
||
|
sr = isl1208_i2c_get_sr(client);
|
||
|
if (sr >= 0)
|
||
|
break;
|
||
|
|
||
|
if (time_after(jiffies, timeout)) {
|
||
|
dev_err(&client->dev, "%s: reading SR failed\n",
|
||
|
__func__);
|
||
|
return sr;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (sr & ISL1208_REG_SR_ALM) {
|
||
|
dev_dbg(&client->dev, "alarm!\n");
|
||
|
|
||
|
rtc_update_irq(isl1208->rtc, 1, RTC_IRQF | RTC_AF);
|
||
|
|
||
|
/* Clear the alarm */
|
||
|
sr &= ~ISL1208_REG_SR_ALM;
|
||
|
sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);
|
||
|
if (sr < 0)
|
||
|
dev_err(&client->dev, "%s: writing SR failed\n",
|
||
|
__func__);
|
||
|
else
|
||
|
handled = 1;
|
||
|
|
||
|
/* Disable the alarm */
|
||
|
err = isl1208_rtc_toggle_alarm(client, 0);
|
||
|
if (err)
|
||
|
return err;
|
||
|
}
|
||
|
|
||
|
if (isl1208->config->has_tamper && (sr & ISL1208_REG_SR_EVT)) {
|
||
|
dev_warn(&client->dev, "event detected");
|
||
|
handled = 1;
|
||
|
if (isl1208->config->has_timestamp)
|
||
|
sysfs_notify(&isl1208->rtc->dev.kobj, NULL,
|
||
|
dev_attr_timestamp0.attr.name);
|
||
|
}
|
||
|
|
||
|
return handled ? IRQ_HANDLED : IRQ_NONE;
|
||
|
}
|
||
|
|
||
|
static const 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 = isl1208_i2c_get_atr(to_i2c_client(dev->parent));
|
||
|
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 = isl1208_i2c_get_dtr(to_i2c_client(dev->parent));
|
||
|
if (dtr < 0)
|
||
|
return dtr;
|
||
|
|
||
|
return sprintf(buf, "%d ppm\n", dtr - 100);
|
||
|
}
|
||
|
|
||
|
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 = isl1208_i2c_get_usr(to_i2c_client(dev->parent));
|
||
|
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;
|
||
|
|
||
|
if (isl1208_i2c_set_usr(to_i2c_client(dev->parent), usr))
|
||
|
return -EIO;
|
||
|
|
||
|
return count;
|
||
|
}
|
||
|
|
||
|
static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr,
|
||
|
isl1208_sysfs_store_usr);
|
||
|
|
||
|
static struct attribute *isl1208_rtc_attrs[] = {
|
||
|
&dev_attr_atrim.attr,
|
||
|
&dev_attr_dtrim.attr,
|
||
|
&dev_attr_usr.attr,
|
||
|
NULL
|
||
|
};
|
||
|
|
||
|
static const struct attribute_group isl1208_rtc_sysfs_files = {
|
||
|
.attrs = isl1208_rtc_attrs,
|
||
|
};
|
||
|
|
||
|
static struct attribute *isl1219_rtc_attrs[] = {
|
||
|
&dev_attr_timestamp0.attr,
|
||
|
NULL
|
||
|
};
|
||
|
|
||
|
static const struct attribute_group isl1219_rtc_sysfs_files = {
|
||
|
.attrs = isl1219_rtc_attrs,
|
||
|
};
|
||
|
|
||
|
static int isl1208_nvmem_read(void *priv, unsigned int off, void *buf,
|
||
|
size_t count)
|
||
|
{
|
||
|
struct isl1208_state *isl1208 = priv;
|
||
|
struct i2c_client *client = to_i2c_client(isl1208->rtc->dev.parent);
|
||
|
int ret;
|
||
|
|
||
|
/* nvmem sanitizes offset/count for us, but count==0 is possible */
|
||
|
if (!count)
|
||
|
return count;
|
||
|
ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1 + off, buf,
|
||
|
count);
|
||
|
return ret == 0 ? count : ret;
|
||
|
}
|
||
|
|
||
|
static int isl1208_nvmem_write(void *priv, unsigned int off, void *buf,
|
||
|
size_t count)
|
||
|
{
|
||
|
struct isl1208_state *isl1208 = priv;
|
||
|
struct i2c_client *client = to_i2c_client(isl1208->rtc->dev.parent);
|
||
|
int ret;
|
||
|
|
||
|
/* nvmem sanitizes off/count for us, but count==0 is possible */
|
||
|
if (!count)
|
||
|
return count;
|
||
|
ret = isl1208_i2c_set_regs(client, ISL1208_REG_USR1 + off, buf,
|
||
|
count);
|
||
|
|
||
|
return ret == 0 ? count : ret;
|
||
|
}
|
||
|
|
||
|
static const struct nvmem_config isl1208_nvmem_config = {
|
||
|
.name = "isl1208_nvram",
|
||
|
.word_size = 1,
|
||
|
.stride = 1,
|
||
|
/* .size from chip specific config */
|
||
|
.reg_read = isl1208_nvmem_read,
|
||
|
.reg_write = isl1208_nvmem_write,
|
||
|
};
|
||
|
|
||
|
static int isl1208_setup_irq(struct i2c_client *client, int irq)
|
||
|
{
|
||
|
int rc = devm_request_threaded_irq(&client->dev, irq, NULL,
|
||
|
isl1208_rtc_interrupt,
|
||
|
IRQF_SHARED | IRQF_ONESHOT,
|
||
|
isl1208_driver.driver.name,
|
||
|
client);
|
||
|
if (!rc) {
|
||
|
device_init_wakeup(&client->dev, 1);
|
||
|
enable_irq_wake(irq);
|
||
|
} else {
|
||
|
dev_err(&client->dev,
|
||
|
"Unable to request irq %d, no alarm support\n",
|
||
|
irq);
|
||
|
}
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
|
||
|
{
|
||
|
int rc = 0;
|
||
|
struct isl1208_state *isl1208;
|
||
|
int evdet_irq = -1;
|
||
|
|
||
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
|
||
|
return -ENODEV;
|
||
|
|
||
|
if (isl1208_i2c_validate_client(client) < 0)
|
||
|
return -ENODEV;
|
||
|
|
||
|
/* Allocate driver state, point i2c client data to it */
|
||
|
isl1208 = devm_kzalloc(&client->dev, sizeof(*isl1208), GFP_KERNEL);
|
||
|
if (!isl1208)
|
||
|
return -ENOMEM;
|
||
|
i2c_set_clientdata(client, isl1208);
|
||
|
|
||
|
/* Determine which chip we have */
|
||
|
if (client->dev.of_node) {
|
||
|
isl1208->config = of_device_get_match_data(&client->dev);
|
||
|
if (!isl1208->config)
|
||
|
return -ENODEV;
|
||
|
} else {
|
||
|
if (id->driver_data >= ISL_LAST_ID)
|
||
|
return -ENODEV;
|
||
|
isl1208->config = &isl1208_configs[id->driver_data];
|
||
|
}
|
||
|
|
||
|
isl1208->rtc = devm_rtc_allocate_device(&client->dev);
|
||
|
if (IS_ERR(isl1208->rtc))
|
||
|
return PTR_ERR(isl1208->rtc);
|
||
|
|
||
|
isl1208->rtc->ops = &isl1208_rtc_ops;
|
||
|
|
||
|
/* Setup nvmem configuration in driver state struct */
|
||
|
isl1208->nvmem_config = isl1208_nvmem_config;
|
||
|
isl1208->nvmem_config.size = isl1208->config->nvmem_length;
|
||
|
isl1208->nvmem_config.priv = isl1208;
|
||
|
|
||
|
rc = isl1208_i2c_get_sr(client);
|
||
|
if (rc < 0) {
|
||
|
dev_err(&client->dev, "reading status failed\n");
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
if (rc & ISL1208_REG_SR_RTCF)
|
||
|
dev_warn(&client->dev, "rtc power failure detected, "
|
||
|
"please set clock.\n");
|
||
|
|
||
|
if (isl1208->config->has_tamper) {
|
||
|
struct device_node *np = client->dev.of_node;
|
||
|
u32 evienb;
|
||
|
|
||
|
rc = i2c_smbus_read_byte_data(client, ISL1219_REG_EV);
|
||
|
if (rc < 0) {
|
||
|
dev_err(&client->dev, "failed to read EV reg\n");
|
||
|
return rc;
|
||
|
}
|
||
|
rc |= ISL1219_REG_EV_EVEN;
|
||
|
if (!of_property_read_u32(np, "isil,ev-evienb", &evienb)) {
|
||
|
if (evienb)
|
||
|
rc |= ISL1219_REG_EV_EVIENB;
|
||
|
else
|
||
|
rc &= ~ISL1219_REG_EV_EVIENB;
|
||
|
}
|
||
|
rc = i2c_smbus_write_byte_data(client, ISL1219_REG_EV, rc);
|
||
|
if (rc < 0) {
|
||
|
dev_err(&client->dev, "could not enable tamper detection\n");
|
||
|
return rc;
|
||
|
}
|
||
|
evdet_irq = of_irq_get_byname(np, "evdet");
|
||
|
}
|
||
|
if (isl1208->config->has_timestamp) {
|
||
|
rc = rtc_add_group(isl1208->rtc, &isl1219_rtc_sysfs_files);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
rc = rtc_add_group(isl1208->rtc, &isl1208_rtc_sysfs_files);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
|
||
|
if (client->irq > 0) {
|
||
|
rc = isl1208_setup_irq(client, client->irq);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
|
||
|
} else {
|
||
|
clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, isl1208->rtc->features);
|
||
|
}
|
||
|
|
||
|
if (evdet_irq > 0 && evdet_irq != client->irq)
|
||
|
rc = isl1208_setup_irq(client, evdet_irq);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
|
||
|
rc = devm_rtc_nvmem_register(isl1208->rtc, &isl1208->nvmem_config);
|
||
|
if (rc)
|
||
|
return rc;
|
||
|
|
||
|
return devm_rtc_register_device(isl1208->rtc);
|
||
|
}
|
||
|
|
||
|
static struct i2c_driver isl1208_driver = {
|
||
|
.driver = {
|
||
|
.name = "rtc-isl1208",
|
||
|
.of_match_table = of_match_ptr(isl1208_of_match),
|
||
|
},
|
||
|
.probe = isl1208_probe,
|
||
|
.id_table = isl1208_id,
|
||
|
};
|
||
|
|
||
|
module_i2c_driver(isl1208_driver);
|
||
|
|
||
|
MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>");
|
||
|
MODULE_DESCRIPTION("Intersil ISL1208 RTC driver");
|
||
|
MODULE_LICENSE("GPL");
|