From f4cdf7ca9a1fdcca413157df19753f388a5a224e Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Wed, 19 Aug 2026 10:09:22 -0700 Subject: Merge tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media Pull media updates from Mauro Carvalho Chehab: - v4l2-core: added ISP statistics support and per-block validation - v4l2-core: Allow unknown HDR10 white point and luminance - New camera sensors: Sony IMX678 and IMX471m, Himax HM1092 IR sensor - New codec: Milos: VPU v2.0 codec support - isp driver: gained support for Dreamchip RPPX1 ISP framework - vsp1 driver: gained support for RZ/T2H and RZ/N2H - Novalake driver: gained CVS support for new NVL hardware - dvb-core: fix feed leak on failed DMX_ADD_PID - several driver fixes, cleanups and minor improvements * tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (308 commits) media: ipu-bridge: check all DMI entries when overriding sensor rotation media: v4l2-async: avoid deleting unlinked ASC entry on link error media: rzg2l-cru: Align bytesperline to hardware DMA stride requirement media: intel/ipu6: fix async notifier cleanup leak on parse error media: staging/ipu7: fix async notifier UAF on probe error path media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem() media: rcar-isp: Fix VSPX reference leaks media: rcar-isp: Release ISPCORE resources media: i2c: imx415: Release runtime PM reference on VBLANK error media: i2c: imx415: Return test pattern write errors media: renesas: vsp1: Declare index variables in for loop statement media: renesas: vsp1: Make reset control optional to support platforms without a reset line media: dt-bindings: media: renesas,vsp1: Document RZ/T2H and RZ/N2H SoCs media: dt-bindings: media: renesas,fcp: Document RZ/T2H and RZ/N2H SoCs media: nxp: imx8-isi: Add additional 32-bit RGB format support media: nxp: imx8-isi: Add 16-bit raw Bayer format support media: nxp: imx8-isi: Implement per-stream reference counting for multiplexed streams media: nxp: imx8-isi: Use BIT_ULL() for 64-bit stream masks media: nxp: imx8-isi: Correct color map between V4L2 and ISI ... --- drivers/rtc/rtc-rx8581.c | 322 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 322 insertions(+) create mode 100644 drivers/rtc/rtc-rx8581.c (limited to 'drivers/rtc/rtc-rx8581.c') diff --git a/drivers/rtc/rtc-rx8581.c b/drivers/rtc/rtc-rx8581.c new file mode 100644 index 000000000..cf4dab94c --- /dev/null +++ b/drivers/rtc/rtc-rx8581.c @@ -0,0 +1,322 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * An I2C driver for the Epson RX8581 RTC + * + * Author: Martyn Welch + * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc. + * + * Based on: rtc-pcf8563.c (An I2C driver for the Philips PCF8563 RTC) + * Copyright 2005-06 Tower Technologies + */ + +#include +#include +#include +#include +#include +#include +#include + +#define RX8581_REG_SC 0x00 /* Second in BCD */ +#define RX8581_REG_MN 0x01 /* Minute in BCD */ +#define RX8581_REG_HR 0x02 /* Hour in BCD */ +#define RX8581_REG_DW 0x03 /* Day of Week */ +#define RX8581_REG_DM 0x04 /* Day of Month in BCD */ +#define RX8581_REG_MO 0x05 /* Month in BCD */ +#define RX8581_REG_YR 0x06 /* Year in BCD */ +#define RX8581_REG_RAM 0x07 /* RAM */ +#define RX8581_REG_AMN 0x08 /* Alarm Min in BCD*/ +#define RX8581_REG_AHR 0x09 /* Alarm Hour in BCD */ +#define RX8581_REG_ADM 0x0A +#define RX8581_REG_ADW 0x0A +#define RX8581_REG_TMR0 0x0B +#define RX8581_REG_TMR1 0x0C +#define RX8581_REG_EXT 0x0D /* Extension Register */ +#define RX8581_REG_FLAG 0x0E /* Flag Register */ +#define RX8581_REG_CTRL 0x0F /* Control Register */ + + +/* Flag Register bit definitions */ +#define RX8581_FLAG_UF 0x20 /* Update */ +#define RX8581_FLAG_TF 0x10 /* Timer */ +#define RX8581_FLAG_AF 0x08 /* Alarm */ +#define RX8581_FLAG_VLF 0x02 /* Voltage Low */ + +/* Control Register bit definitions */ +#define RX8581_CTRL_UIE 0x20 /* Update Interrupt Enable */ +#define RX8581_CTRL_TIE 0x10 /* Timer Interrupt Enable */ +#define RX8581_CTRL_AIE 0x08 /* Alarm Interrupt Enable */ +#define RX8581_CTRL_STOP 0x02 /* STOP bit */ +#define RX8581_CTRL_RESET 0x01 /* RESET bit */ + +#define RX8571_USER_RAM 0x10 +#define RX8571_NVRAM_SIZE 0x10 + +struct rx85x1_config { + struct regmap_config regmap; + unsigned int num_nvram; +}; + +/* + * In the routines that deal directly with the rx8581 hardware, we use + * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch. + */ +static int rx8581_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct i2c_client *client = to_i2c_client(dev); + unsigned char date[7]; + unsigned int data; + int err; + struct regmap *regmap = i2c_get_clientdata(client); + + /* First we ensure that the "update flag" is not set, we read the + * time and date then re-read the "update flag". If the update flag + * has been set, we know that the time has changed during the read so + * we repeat the whole process again. + */ + err = regmap_read(regmap, RX8581_REG_FLAG, &data); + if (err < 0) + return err; + + if (data & RX8581_FLAG_VLF) { + dev_warn(dev, + "low voltage detected, date/time is not reliable.\n"); + return -EINVAL; + } + + do { + /* If update flag set, clear it */ + if (data & RX8581_FLAG_UF) { + err = regmap_write(regmap, RX8581_REG_FLAG, + data & ~RX8581_FLAG_UF); + if (err < 0) + return err; + } + + /* Now read time and date */ + err = regmap_bulk_read(regmap, RX8581_REG_SC, date, + sizeof(date)); + if (err < 0) + return err; + + /* Check flag register */ + err = regmap_read(regmap, RX8581_REG_FLAG, &data); + if (err < 0) + return err; + } while (data & RX8581_FLAG_UF); + + dev_dbg(dev, "%s: raw data is sec=%02x, min=%02x, hr=%02x, " + "wday=%02x, mday=%02x, mon=%02x, year=%02x\n", + __func__, + date[0], date[1], date[2], date[3], date[4], date[5], date[6]); + + tm->tm_sec = bcd2bin(date[RX8581_REG_SC] & 0x7F); + tm->tm_min = bcd2bin(date[RX8581_REG_MN] & 0x7F); + tm->tm_hour = bcd2bin(date[RX8581_REG_HR] & 0x3F); /* rtc hr 0-23 */ + tm->tm_wday = ilog2(date[RX8581_REG_DW] & 0x7F); + tm->tm_mday = bcd2bin(date[RX8581_REG_DM] & 0x3F); + tm->tm_mon = bcd2bin(date[RX8581_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */ + tm->tm_year = bcd2bin(date[RX8581_REG_YR]) + 100; + + dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, " + "mday=%d, mon=%d, year=%d, wday=%d\n", + __func__, + tm->tm_sec, tm->tm_min, tm->tm_hour, + tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); + + return 0; +} + +static int rx8581_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct i2c_client *client = to_i2c_client(dev); + int err; + unsigned char buf[7]; + struct regmap *regmap = i2c_get_clientdata(client); + + dev_dbg(dev, "%s: secs=%d, mins=%d, hours=%d, " + "mday=%d, mon=%d, year=%d, wday=%d\n", + __func__, + tm->tm_sec, tm->tm_min, tm->tm_hour, + tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); + + /* hours, minutes and seconds */ + buf[RX8581_REG_SC] = bin2bcd(tm->tm_sec); + buf[RX8581_REG_MN] = bin2bcd(tm->tm_min); + buf[RX8581_REG_HR] = bin2bcd(tm->tm_hour); + + buf[RX8581_REG_DM] = bin2bcd(tm->tm_mday); + + /* month, 1 - 12 */ + buf[RX8581_REG_MO] = bin2bcd(tm->tm_mon + 1); + + /* year and century */ + buf[RX8581_REG_YR] = bin2bcd(tm->tm_year - 100); + buf[RX8581_REG_DW] = (0x1 << tm->tm_wday); + + /* Stop the clock */ + err = regmap_update_bits(regmap, RX8581_REG_CTRL, + RX8581_CTRL_STOP, RX8581_CTRL_STOP); + if (err < 0) + return err; + + /* write register's data */ + err = regmap_bulk_write(regmap, RX8581_REG_SC, buf, sizeof(buf)); + if (err < 0) + return err; + + /* get VLF and clear it */ + err = regmap_update_bits(regmap, RX8581_REG_FLAG, RX8581_FLAG_VLF, 0); + if (err < 0) + return err; + + /* Restart the clock */ + return regmap_update_bits(regmap, RX8581_REG_CTRL, + RX8581_CTRL_STOP, 0); +} + +static const struct rtc_class_ops rx8581_rtc_ops = { + .read_time = rx8581_rtc_read_time, + .set_time = rx8581_rtc_set_time, +}; + +static int rx8571_nvram_read(void *priv, unsigned int offset, void *val, + size_t bytes) +{ + struct regmap *regmap = priv; + + return regmap_bulk_read(regmap, RX8571_USER_RAM + offset, val, bytes); +} + +static int rx8571_nvram_write(void *priv, unsigned int offset, void *val, + size_t bytes) +{ + struct regmap *regmap = priv; + + return regmap_bulk_write(regmap, RX8571_USER_RAM + offset, val, bytes); +} + +static int rx85x1_nvram_read(void *priv, unsigned int offset, void *val, + size_t bytes) +{ + struct regmap *regmap = priv; + unsigned int tmp_val; + int ret; + + ret = regmap_read(regmap, RX8581_REG_RAM, &tmp_val); + (*(unsigned char *)val) = (unsigned char) tmp_val; + + return ret; +} + +static int rx85x1_nvram_write(void *priv, unsigned int offset, void *val, + size_t bytes) +{ + struct regmap *regmap = priv; + unsigned char tmp_val; + + tmp_val = *((unsigned char *)val); + return regmap_write(regmap, RX8581_REG_RAM, (unsigned int)tmp_val); +} + +static const struct rx85x1_config rx8581_config = { + .regmap = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0xf, + }, + .num_nvram = 1 +}; + +static const struct rx85x1_config rx8571_config = { + .regmap = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0x1f, + }, + .num_nvram = 2 +}; + +static int rx8581_probe(struct i2c_client *client) +{ + struct regmap *regmap; + const struct rx85x1_config *config = &rx8581_config; + const void *data = of_device_get_match_data(&client->dev); + struct rtc_device *rtc; + static struct nvmem_config nvmem_cfg[] = { + { + .name = "rx85x1-", + .word_size = 1, + .stride = 1, + .size = 1, + .reg_read = rx85x1_nvram_read, + .reg_write = rx85x1_nvram_write, + }, { + .name = "rx8571-", + .word_size = 1, + .stride = 1, + .size = RX8571_NVRAM_SIZE, + .reg_read = rx8571_nvram_read, + .reg_write = rx8571_nvram_write, + }, + }; + int ret, i; + + dev_dbg(&client->dev, "%s\n", __func__); + + if (data) + config = data; + + regmap = devm_regmap_init_i2c(client, &config->regmap); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + i2c_set_clientdata(client, regmap); + + rtc = devm_rtc_allocate_device(&client->dev); + if (IS_ERR(rtc)) + return PTR_ERR(rtc); + + rtc->ops = &rx8581_rtc_ops; + rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; + rtc->range_max = RTC_TIMESTAMP_END_2099; + rtc->start_secs = 0; + rtc->set_start_time = true; + + ret = devm_rtc_register_device(rtc); + + for (i = 0; i < config->num_nvram; i++) { + nvmem_cfg[i].priv = regmap; + devm_rtc_nvmem_register(rtc, &nvmem_cfg[i]); + } + + return ret; +} + +static const struct i2c_device_id rx8581_id[] = { + { .name = "rx8581" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, rx8581_id); + +static const __maybe_unused struct of_device_id rx8581_of_match[] = { + { .compatible = "epson,rx8571", .data = &rx8571_config }, + { .compatible = "epson,rx8581", .data = &rx8581_config }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, rx8581_of_match); + +static struct i2c_driver rx8581_driver = { + .driver = { + .name = "rtc-rx8581", + .of_match_table = of_match_ptr(rx8581_of_match), + }, + .probe = rx8581_probe, + .id_table = rx8581_id, +}; + +module_i2c_driver(rx8581_driver); + +MODULE_AUTHOR("Martyn Welch "); +MODULE_DESCRIPTION("Epson RX-8571/RX-8581 RTC driver"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1