// SPDX-License-Identifier: GPL-2.0-or-later /* * Intersil ISL1208 rtc class driver * * Copyright 2005,2006 Hebert Valerio Riedel <[email protected]> */ #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 … #define ISL1208_REG_MN … #define ISL1208_REG_HR … #define ISL1208_REG_HR_MIL … #define ISL1208_REG_HR_PM … #define ISL1208_REG_DT … #define ISL1208_REG_MO … #define ISL1208_REG_YR … #define ISL1208_REG_DW … #define ISL1208_RTC_SECTION_LEN … /* control/status section */ #define ISL1208_REG_SR … #define ISL1208_REG_SR_ARST … #define ISL1208_REG_SR_XTOSCB … #define ISL1208_REG_SR_WRTC … #define ISL1208_REG_SR_EVT … #define ISL1208_REG_SR_ALM … #define ISL1208_REG_SR_BAT … #define ISL1208_REG_SR_RTCF … #define ISL1208_REG_INT … #define ISL1208_REG_INT_ALME … #define ISL1208_REG_INT_IM … #define ISL1219_REG_EV … #define ISL1219_REG_EV_EVEN … #define ISL1219_REG_EV_EVIENB … #define ISL1208_REG_ATR … #define ISL1208_REG_DTR … /* alarm section */ #define ISL1208_REG_SCA … #define ISL1208_REG_MNA … #define ISL1208_REG_HRA … #define ISL1208_REG_DTA … #define ISL1208_REG_MOA … #define ISL1208_REG_DWA … #define ISL1208_ALARM_SECTION_LEN … /* user section */ #define ISL1208_REG_USR1 … #define ISL1208_REG_USR2 … #define ISL1208_USR_SECTION_LEN … /* event section */ #define ISL1219_REG_SCT … #define ISL1219_REG_MNT … #define ISL1219_REG_HRT … #define ISL1219_REG_DTT … #define ISL1219_REG_MOT … #define ISL1219_REG_YRT … #define ISL1219_EVT_SECTION_LEN … static struct i2c_driver isl1208_driver; /* Chip capabilities table */ struct isl1208_config { … }; static const struct isl1208_config config_isl1208 = …; static const struct isl1208_config config_isl1209 = …; static const struct isl1208_config config_isl1218 = …; static const struct isl1208_config config_isl1219 = …; static const struct isl1208_config config_raa215300_a0 = …; static const struct i2c_device_id isl1208_id[] = …; MODULE_DEVICE_TABLE(i2c, isl1208_id); static const __maybe_unused struct of_device_id isl1208_of_match[] = …; MODULE_DEVICE_TABLE(of, isl1208_of_match); /* Device state */ struct isl1208_state { … }; /* block read */ static int isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[], unsigned len) { … } /* block write */ static int isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[], unsigned len) { … } /* simple check to see whether we have a isl1208 */ static int isl1208_i2c_validate_client(struct i2c_client *client) { … } static int isl1208_set_xtoscb(struct i2c_client *client, int sr, int xtosb_val) { … } static int isl1208_i2c_get_sr(struct i2c_client *client) { … } static int isl1208_i2c_get_atr(struct i2c_client *client) { … } /* returns adjustment value + 100 */ static int isl1208_i2c_get_dtr(struct i2c_client *client) { … } static int isl1208_i2c_get_usr(struct i2c_client *client) { … } static int isl1208_i2c_set_usr(struct i2c_client *client, u16 usr) { … } static int isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable) { … } static int isl1208_rtc_proc(struct device *dev, struct seq_file *seq) { … } static int isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm) { … } static int isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) { … } static int isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) { … } static int isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm) { … } static int isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm) { … } static int isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm) { … } static int isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) { … } static int isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *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) { … } static const struct rtc_class_ops isl1208_rtc_ops = …; /* sysfs interface */ static ssize_t isl1208_sysfs_show_atrim(struct device *dev, struct device_attribute *attr, char *buf) { … } 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) { … } 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) { … } static ssize_t isl1208_sysfs_store_usr(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr, isl1208_sysfs_store_usr); static struct attribute *isl1208_rtc_attrs[] = …; static const struct attribute_group isl1208_rtc_sysfs_files = …; static struct attribute *isl1219_rtc_attrs[] = …; static const struct attribute_group isl1219_rtc_sysfs_files = …; static int isl1208_nvmem_read(void *priv, unsigned int off, void *buf, size_t count) { … } static int isl1208_nvmem_write(void *priv, unsigned int off, void *buf, size_t count) { … } static const struct nvmem_config isl1208_nvmem_config = …; static int isl1208_setup_irq(struct i2c_client *client, int irq) { … } static int isl1208_clk_present(struct i2c_client *client, const char *name) { … } static int isl1208_probe(struct i2c_client *client) { … } static struct i2c_driver isl1208_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
Codebase Browser
linux