// SPDX-License-Identifier: GPL-2.0-or-later/* * Intersil ISL1208 rtc class driver * * Copyright 2005,2006 Hebert Valerio Riedel <hvr@gnu.org> */ #include <linux/bcd.h>#include <linux/clk.h>#include <linux/delay.h>#include <linux/i2c.h>#include <linux/module.h>#include <linux/of.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; /* Chip capabilities table */struct isl1208_config { unsigned int nvmem_length; unsigned has_tamper:1; unsigned has_timestamp:1; unsigned has_inverted_osc_bit:1;}; static const struct isl1208_config config_isl1208 = { .nvmem_length = 2, .has_tamper = false, .has_timestamp = false}; static const struct isl1208_config config_isl1209 = { .nvmem_length = 2, .has_tamper = true, .has_timestamp = false}; static const struct isl1208_config config_isl1218 = { .nvmem_length = 8, .has_tamper = false, .has_timestamp = false}; static const struct isl1208_config config_isl1219 = { .nvmem_length = 2, .has_tamper = true, .has_timestamp = true}; static const struct isl1208_config config_raa215300_a0 = { .nvmem_length = 2, .has_tamper = false, .has_timestamp = false, .has_inverted_osc_bit = true}; static const struct i2c_device_id isl1208_id[] = { { .name = "isl1208", .driver_data = (kernel_ulong_t)&config_isl1208 }, { .name = "isl1209", .driver_data = (kernel_ulong_t)&config_isl1209 }, { .name = "isl1218", .driver_data = (kernel_ulong_t)&config_isl1218 }, { .name = "isl1219", .driver_data = (kernel_ulong_t)&config_isl1219 }, { .name = "raa215300_a0", .driver_data = (kernel_ulong_t)&config_raa215300_a0 }, { }};MODULE_DEVICE_TABLE(i2c, isl1208_id); static const __maybe_unused struct of_device_id isl1208_of_match[] = { { .compatible = "isil,isl1208", .data = &config_isl1208 }, { .compatible = "isil,isl1209", .data = &config_isl1209 }, { .compatible = "isil,isl1218", .data = &config_isl1218 }, { .compatible = "isil,isl1219", .data = &config_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 intisl1208_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 intisl1208_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 intisl1208_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_set_xtoscb(struct i2c_client *client, int sr, int xtosb_val){ /* Do nothing if bit is already set to desired value */ if (!!(sr & ISL1208_REG_SR_XTOSCB) == xtosb_val) return 0; if (xtosb_val) sr |= ISL1208_REG_SR_XTOSCB; else sr &= ~ISL1208_REG_SR_XTOSCB; return i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);} static intisl1208_i2c_get_sr(struct i2c_client *client){ return i2c_smbus_read_byte_data(client, ISL1208_REG_SR);} static intisl1208_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 intisl1208_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 intisl1208_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 intisl1208_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 intisl1208_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 intisl1208_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 intisl1208_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 intisl1208_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 intisl1208_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 intisl1208_rtc_read_time(struct device *dev, struct rtc_time *tm){ return isl1208_i2c_read_time(to_i2c_client(dev), tm);} static intisl1208_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); Lines 1–500 of 1001. Load more
// SPDX-License-Identifier: GPL-2.0-or-later /* * Intersil ISL1208 rtc class driver * * Copyright 2005,2006 Hebert Valerio Riedel <hvr@gnu.org> */ #include <linux/bcd.h> #include <linux/clk.h> #include <linux/delay.h> #include <linux/i2c.h> #include <linux/module.h> #include <linux/of.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; /* Chip capabilities table */ struct isl1208_config { unsigned int nvmem_length; unsigned has_tamper:1; unsigned has_timestamp:1; unsigned has_inverted_osc_bit:1; }; static const struct isl1208_config config_isl1208 = { .nvmem_length = 2, .has_tamper = false, .has_timestamp = false }; static const struct isl1208_config config_isl1209 = { .nvmem_length = 2, .has_tamper = true, .has_timestamp = false }; static const struct isl1208_config config_isl1218 = { .nvmem_length = 8, .has_tamper = false, .has_timestamp = false }; static const struct isl1208_config config_isl1219 = { .nvmem_length = 2, .has_tamper = true, .has_timestamp = true }; static const struct isl1208_config config_raa215300_a0 = { .nvmem_length = 2, .has_tamper = false, .has_timestamp = false, .has_inverted_osc_bit = true }; static const struct i2c_device_id isl1208_id[] = { { .name = "isl1208", .driver_data = (kernel_ulong_t)&config_isl1208 }, { .name = "isl1209", .driver_data = (kernel_ulong_t)&config_isl1209 }, { .name = "isl1218", .driver_data = (kernel_ulong_t)&config_isl1218 }, { .name = "isl1219", .driver_data = (kernel_ulong_t)&config_isl1219 }, { .name = "raa215300_a0", .driver_data = (kernel_ulong_t)&config_raa215300_a0 }, { } }; MODULE_DEVICE_TABLE(i2c, isl1208_id); static const __maybe_unused struct of_device_id isl1208_of_match[] = { { .compatible = "isil,isl1208", .data = &config_isl1208 }, { .compatible = "isil,isl1209", .data = &config_isl1209 }, { .compatible = "isil,isl1218", .data = &config_isl1218 }, { .compatible = "isil,isl1219", .data = &config_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_set_xtoscb(struct i2c_client *client, int sr, int xtosb_val) { /* Do nothing if bit is already set to desired value */ if (!!(sr & ISL1208_REG_SR_XTOSCB) == xtosb_val) return 0; if (xtosb_val) sr |= ISL1208_REG_SR_XTOSCB; else sr &= ~ISL1208_REG_SR_XTOSCB; return i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr); } 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);