| /* |
| * Intersil ISL1208 rtc class driver |
| * |
| * Copyright 2005,2006 Hebert Valerio Riedel <hvr@gnu.org> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| * |
| */ |
| |
| #include <linux/bcd.h> |
| #include <linux/i2c.h> |
| #include <linux/module.h> |
| #include <linux/of_device.h> |
| #include <linux/of_irq.h> |
| #include <linux/rtc.h> |
| |
| /* Register map */ |
| /* rtc section */ |
| #define ISL1208_REG_SC 0x00 |
| #define ISL1208_REG_MN 0x01 |
| #define ISL1208_REG_HR 0x02 |
| #define ISL1208_REG_HR_MIL (1<<7) /* 24h/12h mode */ |
| #define ISL1208_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */ |
| #define ISL1208_REG_DT 0x03 |
| #define ISL1208_REG_MO 0x04 |
| #define ISL1208_REG_YR 0x05 |
| #define ISL1208_REG_DW 0x06 |
| #define ISL1208_RTC_SECTION_LEN 7 |
| |
| /* control/status section */ |
| #define ISL1208_REG_SR 0x07 |
| #define ISL1208_REG_SR_ARST (1<<7) /* auto reset */ |
| #define ISL1208_REG_SR_XTOSCB (1<<6) /* crystal oscillator */ |
| #define ISL1208_REG_SR_WRTC (1<<4) /* write rtc */ |
| #define ISL1208_REG_SR_EVT (1<<3) /* event */ |
| #define ISL1208_REG_SR_ALM (1<<2) /* alarm */ |
| #define ISL1208_REG_SR_BAT (1<<1) /* battery */ |
| #define ISL1208_REG_SR_RTCF (1<<0) /* rtc fail */ |
| #define ISL1208_REG_INT 0x08 |
| #define ISL1208_REG_INT_ALME (1<<6) /* alarm enable */ |
| #define ISL1208_REG_INT_IM (1<<7) /* interrupt/alarm mode */ |
| #define ISL1219_REG_EV 0x09 |
| #define ISL1219_REG_EV_EVEN (1<<4) /* event detection enable */ |
| #define ISL1219_REG_EV_EVIENB (1<<7) /* event in pull-up disable */ |
| #define ISL1208_REG_ATR 0x0a |
| #define ISL1208_REG_DTR 0x0b |
| |
| /* alarm section */ |
| #define ISL1208_REG_SCA 0x0c |
| #define ISL1208_REG_MNA 0x0d |
| #define ISL1208_REG_HRA 0x0e |
| #define ISL1208_REG_DTA 0x0f |
| #define ISL1208_REG_MOA 0x10 |
| #define ISL1208_REG_DWA 0x11 |
| #define ISL1208_ALARM_SECTION_LEN 6 |
| |
| /* user section */ |
| #define ISL1208_REG_USR1 0x12 |
| #define ISL1208_REG_USR2 0x13 |
| #define ISL1208_USR_SECTION_LEN 2 |
| |
| /* event section */ |
| #define ISL1219_REG_SCT 0x14 |
| #define ISL1219_REG_MNT 0x15 |
| #define ISL1219_REG_HRT 0x16 |
| #define ISL1219_REG_DTT 0x17 |
| #define ISL1219_REG_MOT 0x18 |
| #define ISL1219_REG_YRT 0x19 |
| #define ISL1219_EVT_SECTION_LEN 6 |
| |
| static struct i2c_driver isl1208_driver; |
| |
| /* ISL1208 various variants */ |
| enum isl1208_id { |
| TYPE_ISL1208 = 0, |
| TYPE_ISL1209, |
| TYPE_ISL1218, |
| TYPE_ISL1219, |
| ISL_LAST_ID |
| }; |
| |
| /* Chip capabilities table */ |
| static const struct isl1208_config { |
| const char name[8]; |
| unsigned int nvmem_length; |
| unsigned has_tamper:1; |
| unsigned has_timestamp:1; |
| } isl1208_configs[] = { |
| [TYPE_ISL1208] = { "isl1208", 2, false, false }, |
| [TYPE_ISL1209] = { "isl1209", 2, true, false }, |
| [TYPE_ISL1218] = { "isl1218", 8, false, false }, |
| [TYPE_ISL1219] = { "isl1219", 2, true, true }, |
| }; |
| |
| static const struct i2c_device_id isl1208_id[] = { |
| { "isl1208", TYPE_ISL1208 }, |
| { "isl1209", TYPE_ISL1209 }, |
| { "isl1218", TYPE_ISL1218 }, |
| { "isl1219", TYPE_ISL1219 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, isl1208_id); |
| |
| static const struct of_device_id isl1208_of_match[] = { |
| { .compatible = "isil,isl1208", .data = &isl1208_configs[TYPE_ISL1208] }, |
| { .compatible = "isil,isl1209", .data = &isl1208_configs[TYPE_ISL1209] }, |
| { .compatible = "isil,isl1218", .data = &isl1208_configs[TYPE_ISL1218] }, |
| { .compatible = "isil,isl1219", .data = &isl1208_configs[TYPE_ISL1219] }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(of, isl1208_of_match); |
| |
| /* Device state */ |
| struct isl1208_state { |
| struct nvmem_config nvmem_config; |
| struct rtc_device *rtc; |
| const struct isl1208_config *config; |
| }; |
| |
| /* block read */ |
| static int |
| isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[], |
| unsigned len) |
| { |
| int ret; |
| |
| WARN_ON(reg > ISL1219_REG_YRT); |
| WARN_ON(reg + len > ISL1219_REG_YRT + 1); |
| |
| ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf); |
| return (ret < 0) ? ret : 0; |
| } |
| |
| /* block write */ |
| static int |
| isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[], |
| unsigned len) |
| { |
| int ret; |
| |
| WARN_ON(reg > ISL1219_REG_YRT); |
| WARN_ON(reg + len > ISL1219_REG_YRT + 1); |
| |
| ret = i2c_smbus_write_i2c_block_data(client, reg, len, buf); |
| return (ret < 0) ? ret : 0; |
| } |
| |
| /* simple check to see whether we have a isl1208 */ |
| static int |
| isl1208_i2c_validate_client(struct i2c_client *client) |
| { |
| u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; |
| u8 zero_mask[ISL1208_RTC_SECTION_LEN] = { |
| 0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8 |
| }; |
| int i; |
| int ret; |
| |
| ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); |
| if (ret < 0) |
| return ret; |
| |
| for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) { |
| if (regs[i] & zero_mask[i]) /* check if bits are cleared */ |
| return -ENODEV; |
| } |
| |
| return 0; |
| } |
| |
| static int |
| isl1208_i2c_get_sr(struct i2c_client *client) |
| { |
| return i2c_smbus_read_byte_data(client, ISL1208_REG_SR); |
| } |
| |
| static int |
| isl1208_i2c_get_atr(struct i2c_client *client) |
| { |
| int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR); |
| if (atr < 0) |
| return atr; |
| |
| /* The 6bit value in the ATR register controls the load |
| * capacitance C_load * in steps of 0.25pF |
| * |
| * bit (1<<5) of the ATR register is inverted |
| * |
| * C_load(ATR=0x20) = 4.50pF |
| * C_load(ATR=0x00) = 12.50pF |
| * C_load(ATR=0x1f) = 20.25pF |
| * |
| */ |
| |
| atr &= 0x3f; /* mask out lsb */ |
| atr ^= 1 << 5; /* invert 6th bit */ |
| atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */ |
| |
| return atr; |
| } |
| |
| /* returns adjustment value + 100 */ |
| static int |
| isl1208_i2c_get_dtr(struct i2c_client *client) |
| { |
| int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR); |
| if (dtr < 0) |
| return -EIO; |
| |
| /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */ |
| dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1); |
| |
| return dtr + 100; |
| } |
| |
| static int |
| isl1208_i2c_get_usr(struct i2c_client *client) |
| { |
| u8 buf[ISL1208_USR_SECTION_LEN] = { 0, }; |
| int ret; |
| |
| ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf, |
| ISL1208_USR_SECTION_LEN); |
| if (ret < 0) |
| return ret; |
| |
| return (buf[1] << 8) | buf[0]; |
| } |
| |
| static int |
| isl1208_i2c_set_usr(struct i2c_client *client, u16 usr) |
| { |
| u8 buf[ISL1208_USR_SECTION_LEN]; |
| |
| buf[0] = usr & 0xff; |
| buf[1] = (usr >> 8) & 0xff; |
| |
| return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf, |
| ISL1208_USR_SECTION_LEN); |
| } |
| |
| static int |
| isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable) |
| { |
| int 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; |
| } |
| |
| if (enable) |
| icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM; |
| else |
| icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM); |
| |
| icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr); |
| if (icr < 0) { |
| dev_err(&client->dev, "%s: writing INT failed\n", __func__); |
| return icr; |
| } |
| |
| return 0; |
| } |
| |
| static int |
| isl1208_rtc_proc(struct device *dev, struct seq_file *seq) |
| { |
| struct i2c_client *const client = to_i2c_client(dev); |
| int sr, dtr, atr, usr; |
| |
| sr = isl1208_i2c_get_sr(client); |
| if (sr < 0) { |
| dev_err(&client->dev, "%s: reading SR failed\n", __func__); |
| return sr; |
| } |
| |
| seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n", |
| (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "", |
| (sr & ISL1208_REG_SR_BAT) ? " BAT" : "", |
| (sr & ISL1208_REG_SR_ALM) ? " ALM" : "", |
| (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "", |
| (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "", |
| (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr); |
| |
| seq_printf(seq, "batt_status\t: %s\n", |
| (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay"); |
| |
| dtr = isl1208_i2c_get_dtr(client); |
| if (dtr >= 0) |
| seq_printf(seq, "digital_trim\t: %d ppm\n", dtr - 100); |
| |
| atr = isl1208_i2c_get_atr(client); |
| if (atr >= 0) |
| seq_printf(seq, "analog_trim\t: %d.%.2d pF\n", |
| atr >> 2, (atr & 0x3) * 25); |
| |
| usr = isl1208_i2c_get_usr(client); |
| if (usr >= 0) |
| seq_printf(seq, "user_data\t: 0x%.4x\n", usr); |
| |
| return 0; |
| } |
| |
| static int |
| isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm) |
| { |
| int sr; |
| u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, }; |
| |
| sr = isl1208_i2c_get_sr(client); |
| if (sr < 0) { |
| dev_err(&client->dev, "%s: reading SR failed\n", __func__); |
| return -EIO; |
| } |
| |
| sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN); |
| if (sr < 0) { |
| dev_err(&client->dev, "%s: reading RTC section failed\n", |
| __func__); |
| return sr; |
| } |
| |
| tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]); |
| tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]); |
| |
| /* HR field has a more complex interpretation */ |
| { |
| const u8 _hr = regs[ISL1208_REG_HR]; |
| if (_hr & ISL1208_REG_HR_MIL) /* 24h format */ |
| tm->tm_hour = bcd2bin(_hr & 0x3f); |
| else { |
| /* 12h format */ |
| tm->tm_hour = bcd2bin(_hr & 0x1f); |
| if (_hr & ISL1208_REG_HR_PM) /* PM flag set */ |
| tm->tm_hour += 12; |
| } |
| } |
| |
| tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]); |
| tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */ |
| tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100; |
| tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]); |
| |
| return 0; |
| } |
| |
| static int |
| isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) |
| { |
| struct rtc_time *const tm = &alarm->time; |
| u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, }; |
| int icr, yr, sr = isl1208_i2c_get_sr(client); |
| |
| if (sr < 0) { |
| dev_err(&client->dev, "%s: reading SR failed\n", __func__); |
| return sr; |
| } |
| |
| sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs, |
| ISL1208_ALARM_SECTION_LEN); |
| if (sr < 0) { |
| dev_err(&client->dev, "%s: reading alarm section failed\n", |
| __func__); |
| return sr; |
| } |
| |
| /* MSB of each alarm register is an enable bit */ |
| tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f); |
| tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f); |
| tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f); |
| tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f); |
| tm->tm_mon = |
| bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1; |
| tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03); |
| |
| /* The alarm doesn't store the year so get it from the rtc section */ |
| yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR); |
| if (yr < 0) { |
| 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; |
| |
| if (evdet_irq > 0 && evdet_irq != client->irq) |
| rc = isl1208_setup_irq(client, evdet_irq); |
| if (rc) |
| return rc; |
| |
| rc = rtc_nvmem_register(isl1208->rtc, &isl1208->nvmem_config); |
| if (rc) |
| return rc; |
| |
| return 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"); |