Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Thierry Reding | 1342 | 72.42% | 1 | 8.33% |
Russell King | 215 | 11.60% | 1 | 8.33% |
Jesper Nilsson | 106 | 5.72% | 1 | 8.33% |
Baruch Siach | 89 | 4.80% | 1 | 8.33% |
Sam Ravnborg | 63 | 3.40% | 1 | 8.33% |
Uwe Kleine-König | 19 | 1.03% | 1 | 8.33% |
Alexandre Belloni | 10 | 0.54% | 3 | 25.00% |
Chris Cui | 4 | 0.22% | 1 | 8.33% |
Jingoo Han | 3 | 0.16% | 1 | 8.33% |
Thomas Gleixner | 2 | 0.11% | 1 | 8.33% |
Total | 1853 | 12 |
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// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2012 Avionic Design GmbH */ #include <linux/bcd.h> #include <linux/i2c.h> #include <linux/module.h> #include <linux/rtc.h> #include <linux/of.h> #define DRIVER_NAME "rtc-pcf8523" #define REG_CONTROL1 0x00 #define REG_CONTROL1_CAP_SEL (1 << 7) #define REG_CONTROL1_STOP (1 << 5) #define REG_CONTROL3 0x02 #define REG_CONTROL3_PM_BLD (1 << 7) /* battery low detection disabled */ #define REG_CONTROL3_PM_VDD (1 << 6) /* switch-over disabled */ #define REG_CONTROL3_PM_DSM (1 << 5) /* direct switching mode */ #define REG_CONTROL3_PM_MASK 0xe0 #define REG_CONTROL3_BLF (1 << 2) /* battery low bit, read-only */ #define REG_SECONDS 0x03 #define REG_SECONDS_OS (1 << 7) #define REG_MINUTES 0x04 #define REG_HOURS 0x05 #define REG_DAYS 0x06 #define REG_WEEKDAYS 0x07 #define REG_MONTHS 0x08 #define REG_YEARS 0x09 #define REG_OFFSET 0x0e #define REG_OFFSET_MODE BIT(7) struct pcf8523 { struct rtc_device *rtc; }; static int pcf8523_read(struct i2c_client *client, u8 reg, u8 *valuep) { struct i2c_msg msgs[2]; u8 value = 0; int err; msgs[0].addr = client->addr; msgs[0].flags = 0; msgs[0].len = sizeof(reg); msgs[0].buf = ® msgs[1].addr = client->addr; msgs[1].flags = I2C_M_RD; msgs[1].len = sizeof(value); msgs[1].buf = &value; err = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); if (err < 0) return err; *valuep = value; return 0; } static int pcf8523_write(struct i2c_client *client, u8 reg, u8 value) { u8 buffer[2] = { reg, value }; struct i2c_msg msg; int err; msg.addr = client->addr; msg.flags = 0; msg.len = sizeof(buffer); msg.buf = buffer; err = i2c_transfer(client->adapter, &msg, 1); if (err < 0) return err; return 0; } static int pcf8523_voltage_low(struct i2c_client *client) { u8 value; int err; err = pcf8523_read(client, REG_CONTROL3, &value); if (err < 0) return err; return !!(value & REG_CONTROL3_BLF); } static int pcf8523_load_capacitance(struct i2c_client *client) { u32 load; u8 value; int err; err = pcf8523_read(client, REG_CONTROL1, &value); if (err < 0) return err; load = 12500; of_property_read_u32(client->dev.of_node, "quartz-load-femtofarads", &load); switch (load) { default: dev_warn(&client->dev, "Unknown quartz-load-femtofarads value: %d. Assuming 12500", load); /* fall through */ case 12500: value |= REG_CONTROL1_CAP_SEL; break; case 7000: value &= ~REG_CONTROL1_CAP_SEL; break; } err = pcf8523_write(client, REG_CONTROL1, value); return err; } static int pcf8523_set_pm(struct i2c_client *client, u8 pm) { u8 value; int err; err = pcf8523_read(client, REG_CONTROL3, &value); if (err < 0) return err; value = (value & ~REG_CONTROL3_PM_MASK) | pm; err = pcf8523_write(client, REG_CONTROL3, value); if (err < 0) return err; return 0; } static int pcf8523_stop_rtc(struct i2c_client *client) { u8 value; int err; err = pcf8523_read(client, REG_CONTROL1, &value); if (err < 0) return err; value |= REG_CONTROL1_STOP; err = pcf8523_write(client, REG_CONTROL1, value); if (err < 0) return err; return 0; } static int pcf8523_start_rtc(struct i2c_client *client) { u8 value; int err; err = pcf8523_read(client, REG_CONTROL1, &value); if (err < 0) return err; value &= ~REG_CONTROL1_STOP; err = pcf8523_write(client, REG_CONTROL1, value); if (err < 0) return err; return 0; } static int pcf8523_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct i2c_client *client = to_i2c_client(dev); u8 start = REG_SECONDS, regs[7]; struct i2c_msg msgs[2]; int err; err = pcf8523_voltage_low(client); if (err < 0) { return err; } else if (err > 0) { dev_err(dev, "low voltage detected, time is unreliable\n"); return -EINVAL; } msgs[0].addr = client->addr; msgs[0].flags = 0; msgs[0].len = 1; msgs[0].buf = &start; msgs[1].addr = client->addr; msgs[1].flags = I2C_M_RD; msgs[1].len = sizeof(regs); msgs[1].buf = regs; err = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); if (err < 0) return err; if (regs[0] & REG_SECONDS_OS) return -EINVAL; tm->tm_sec = bcd2bin(regs[0] & 0x7f); tm->tm_min = bcd2bin(regs[1] & 0x7f); tm->tm_hour = bcd2bin(regs[2] & 0x3f); tm->tm_mday = bcd2bin(regs[3] & 0x3f); tm->tm_wday = regs[4] & 0x7; tm->tm_mon = bcd2bin(regs[5] & 0x1f) - 1; tm->tm_year = bcd2bin(regs[6]) + 100; return 0; } static int pcf8523_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct i2c_client *client = to_i2c_client(dev); struct i2c_msg msg; u8 regs[8]; int err; /* * The hardware can only store values between 0 and 99 in it's YEAR * register (with 99 overflowing to 0 on increment). * After 2100-02-28 we could start interpreting the year to be in the * interval [2100, 2199], but there is no path to switch in a smooth way * because the chip handles YEAR=0x00 (and the out-of-spec * YEAR=0xa0) as a leap year, but 2100 isn't. */ if (tm->tm_year < 100 || tm->tm_year >= 200) return -EINVAL; err = pcf8523_stop_rtc(client); if (err < 0) return err; regs[0] = REG_SECONDS; /* This will purposely overwrite REG_SECONDS_OS */ regs[1] = bin2bcd(tm->tm_sec); regs[2] = bin2bcd(tm->tm_min); regs[3] = bin2bcd(tm->tm_hour); regs[4] = bin2bcd(tm->tm_mday); regs[5] = tm->tm_wday; regs[6] = bin2bcd(tm->tm_mon + 1); regs[7] = bin2bcd(tm->tm_year - 100); msg.addr = client->addr; msg.flags = 0; msg.len = sizeof(regs); msg.buf = regs; err = i2c_transfer(client->adapter, &msg, 1); if (err < 0) { /* * If the time cannot be set, restart the RTC anyway. Note * that errors are ignored if the RTC cannot be started so * that we have a chance to propagate the original error. */ pcf8523_start_rtc(client); return err; } return pcf8523_start_rtc(client); } #ifdef CONFIG_RTC_INTF_DEV static int pcf8523_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) { struct i2c_client *client = to_i2c_client(dev); int ret; switch (cmd) { case RTC_VL_READ: ret = pcf8523_voltage_low(client); if (ret < 0) return ret; if (copy_to_user((void __user *)arg, &ret, sizeof(int))) return -EFAULT; return 0; default: return -ENOIOCTLCMD; } } #else #define pcf8523_rtc_ioctl NULL #endif static int pcf8523_rtc_read_offset(struct device *dev, long *offset) { struct i2c_client *client = to_i2c_client(dev); int err; u8 value; s8 val; err = pcf8523_read(client, REG_OFFSET, &value); if (err < 0) return err; /* sign extend the 7-bit offset value */ val = value << 1; *offset = (value & REG_OFFSET_MODE ? 4069 : 4340) * (val >> 1); return 0; } static int pcf8523_rtc_set_offset(struct device *dev, long offset) { struct i2c_client *client = to_i2c_client(dev); long reg_m0, reg_m1; u8 value; reg_m0 = clamp(DIV_ROUND_CLOSEST(offset, 4340), -64L, 63L); reg_m1 = clamp(DIV_ROUND_CLOSEST(offset, 4069), -64L, 63L); if (abs(reg_m0 * 4340 - offset) < abs(reg_m1 * 4069 - offset)) value = reg_m0 & 0x7f; else value = (reg_m1 & 0x7f) | REG_OFFSET_MODE; return pcf8523_write(client, REG_OFFSET, value); } static const struct rtc_class_ops pcf8523_rtc_ops = { .read_time = pcf8523_rtc_read_time, .set_time = pcf8523_rtc_set_time, .ioctl = pcf8523_rtc_ioctl, .read_offset = pcf8523_rtc_read_offset, .set_offset = pcf8523_rtc_set_offset, }; static int pcf8523_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct pcf8523 *pcf; int err; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) return -ENODEV; pcf = devm_kzalloc(&client->dev, sizeof(*pcf), GFP_KERNEL); if (!pcf) return -ENOMEM; err = pcf8523_load_capacitance(client); if (err < 0) dev_warn(&client->dev, "failed to set xtal load capacitance: %d", err); err = pcf8523_set_pm(client, 0); if (err < 0) return err; pcf->rtc = devm_rtc_device_register(&client->dev, DRIVER_NAME, &pcf8523_rtc_ops, THIS_MODULE); if (IS_ERR(pcf->rtc)) return PTR_ERR(pcf->rtc); i2c_set_clientdata(client, pcf); return 0; } static const struct i2c_device_id pcf8523_id[] = { { "pcf8523", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, pcf8523_id); #ifdef CONFIG_OF static const struct of_device_id pcf8523_of_match[] = { { .compatible = "nxp,pcf8523" }, { .compatible = "microcrystal,rv8523" }, { } }; MODULE_DEVICE_TABLE(of, pcf8523_of_match); #endif static struct i2c_driver pcf8523_driver = { .driver = { .name = DRIVER_NAME, .of_match_table = of_match_ptr(pcf8523_of_match), }, .probe = pcf8523_probe, .id_table = pcf8523_id, }; module_i2c_driver(pcf8523_driver); MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>"); MODULE_DESCRIPTION("NXP PCF8523 RTC driver"); MODULE_LICENSE("GPL v2");
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