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charset="utf-8" Add new compatibility string for the epson rx8901 chip. The chip has input pins for tamper detection. This patch add a new compatibility string for this type. This is needed to enable the functionality for this type of chip. The compatibility string is defined in the driver but not documented in dt-bindings. The patch also add compatibility string for epson,rx8803. The type is supported by the driver but not documented. Signed-off-by: Markus Burri Acked-by: Krzysztof Kozlowski --- Documentation/devicetree/bindings/rtc/epson,rx8900.yaml | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/rtc/epson,rx8900.yaml b/Docu= mentation/devicetree/bindings/rtc/epson,rx8900.yaml index b770149..03af817 100644 --- a/Documentation/devicetree/bindings/rtc/epson,rx8900.yaml +++ b/Documentation/devicetree/bindings/rtc/epson,rx8900.yaml @@ -15,8 +15,10 @@ allOf: properties: compatible: enum: + - epson,rx8803 - epson,rx8804 - epson,rx8900 + - epson,rx8901 - microcrystal,rv8803 =20 reg: --=20 2.39.5 From nobody Sat Feb 7 22:55:21 2026 Received: from EUR03-AM7-obe.outbound.protection.outlook.com (mail-am7eur03on2052.outbound.protection.outlook.com [40.107.105.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 61251207DF5; Fri, 10 Jan 2025 06:14:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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charset="utf-8" The rtc-rv8901 has additional functionality (tamper detection). To support this additional functionality the type must be extended. Signed-off-by: Markus Burri --- drivers/rtc/rtc-rv8803.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c index 1327251..50fbae9 100644 --- a/drivers/rtc/rtc-rv8803.c +++ b/drivers/rtc/rtc-rv8803.c @@ -62,7 +62,8 @@ enum rv8803_type { rv_8803, rx_8803, rx_8804, - rx_8900 + rx_8900, + rx_8901, }; =20 struct rv8803_data { @@ -173,7 +174,8 @@ static int rv8803_regs_reset(struct rv8803_data *rv8803= , bool full) * The RV-8803 resets all registers to POR defaults after voltage-loss, * the Epson RTCs don't, so we manually reset the remainder here. */ - if (full || rv8803->type =3D=3D rx_8803 || rv8803->type =3D=3D rx_8900) { + if (full || rv8803->type =3D=3D rx_8803 || rv8803->type =3D=3D rx_8900 || + rv8803->type =3D=3D rx_8901) { int ret =3D rv8803_regs_init(rv8803); if (ret) return ret; @@ -635,6 +637,7 @@ static const struct i2c_device_id rv8803_id[] =3D { { "rv8804", rx_8804 }, { "rx8803", rx_8803 }, { "rx8900", rx_8900 }, + { "rx8901", rx_8901 }, { } }; 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charset="utf-8" Add register definition and string mapping for rv8901 tamper detection. Signed-off-by: Markus Burri --- drivers/rtc/rtc-rv8803.c | 122 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 122 insertions(+) diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c index 50fbae9..a4f2f53 100644 --- a/drivers/rtc/rtc-rv8803.c +++ b/drivers/rtc/rtc-rv8803.c @@ -58,6 +58,53 @@ #define RX8900_FLAG_SWOFF BIT(2) #define RX8900_FLAG_VDETOFF BIT(3) =20 +#define RX8901_EVIN_EN 0x20 +#define RX8901_EVIN1_CFG 0x21 +#define RX8901_EVIN2_CFG 0x23 +#define RX8901_EVIN3_CFG 0x25 +#define RX8901_EVENTx_CFG_POL GENMASK(1, 0) +#define RX8901_EVENTx_CFG_PUPD GENMASK(4, 2) + +#define RX8901_EVIN1_FLT 0x22 +#define RX8901_EVIN2_FLT 0x24 +#define RX8901_EVIN3_FLT 0x26 + +#define RX8901_BUF1_CFG1 0x27 +#define RX8901_BUF2_CFG1 0x2A +#define RX8901_BUF3_CFG1 0x2D + +#define RX8901_BUF1_STAT 0x28 +#define RX8901_BUF2_STAT 0x2B +#define RX8901_BUF3_STAT 0x2E +#define RX8901_BUFx_STAT_PTR GENMASK(5, 0) +#define RX8901_BUFx_STAT_EMPTF BIT(6) +#define RX8901_BUFx_STAT_FULLF BIT(7) + +#define RX8901_BUF1_CFG2 0x29 +#define RX8901_BUF2_CFG2 0x2C +#define RX8901_BUF3_CFG2 0x2F + +#define RX8901_WRCMD_CFG 0x41 +#define RX8901_WRCMD_TRG 0x42 + +#define RX8901_EVNT_INTE 0x43 +#define RX8901_CAP_EN 0x44 + +#define RX8901_BUF_INTF 0x46 +#define RX8901_BUF_INTF_BUF1F BIT(5) + +#define RX8901_EVNT_INTF 0x47 +#define RX8901_EVNT_INTF_VBATLEVF BIT(3) +#define RX8901_EVNT_INTF_EVIN1F BIT(5) + +#define RX8901_BUF_OVWF 0x4F + +#define NO_OF_EVIN 3 + +#define EVIN_FILTER_FACTOR 125 +#define EVIN_FILTER_MAX 40 +#define EV_READ_MAX_LINE_SIZE 96 + enum rv8803_type { rv_8803, rx_8803, @@ -66,6 +113,81 @@ enum rv8803_type { rx_8901, }; =20 +enum evin_pull_resistor { + no =3D 0b000, + pull_up_500k =3D 0b001, + pull_up_1M =3D 0b010, + pull_up_10M =3D 0b011, + pull_down_500k =3D 0b100, +}; + +enum evin_trigger { + falling_edge =3D 0b00, + rising_edge =3D 0b01, + both_edges =3D 0b10, +}; + +enum evin_buffer_mode { + inhibit =3D 0, + overwrite =3D 1, +}; + +struct cfg_val_txt { + char *txt; + u8 val; + bool hide; +}; + +const struct cfg_val_txt pull_resistor_txt[] =3D { + { "no", no }, + { "PU/500k", pull_up_500k }, + { "PU/1M", pull_up_1M }, + { "PU/10M", pull_up_10M }, + { "PD/500k", pull_down_500k }, + { "no", 0b101, 1 }, + { "no", 0b110, 1 }, + { "no", 0b111, 1 }, + { NULL } +}; + +const struct cfg_val_txt trigger_txt[] =3D { + { "falling", falling_edge }, + { "rising", rising_edge }, + { "both", both_edges }, + { "both", 0b11, 1 }, + { NULL } +}; + +const struct cfg_val_txt buffer_mode_txt[] =3D { + { "inhibit", inhibit }, + { "overwrite", overwrite }, + { NULL } +}; + +const struct cfg_val_txt trg_status_txt[] =3D { + { "EVIN1", BIT(5) }, + { "EVIN2", BIT(6) }, + { "EVIN3", BIT(7) }, + { "CMD", BIT(4) }, + { "VBATL", BIT(3) }, + { "VTMPL", BIT(2) }, + { "VDDL", BIT(1) }, + { "OSCSTP", BIT(0) }, + { NULL } +}; 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charset="utf-8" Add sysfs interface to enable the EVINx pins and read the time-stamp events from EVINX. Signed-off-by: Markus Burri --- drivers/rtc/rtc-rv8803.c | 277 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 277 insertions(+) diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c index a4f2f53..754657d 100644 --- a/drivers/rtc/rtc-rv8803.c +++ b/drivers/rtc/rtc-rv8803.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -680,6 +681,276 @@ static int rv8803_nvram_read(void *priv, unsigned int= offset, return 0; } =20 +static int rv8803_ts_event_write_evin(int evin, struct rv8803_data *rv8803= , int pullup_down, + int trigger, int filter) +{ + int ret; + u8 reg_mask; + struct i2c_client *client =3D rv8803->client; + + /* according to data-sheet, "1" is not valid for filter */ + if (evin >=3D NO_OF_EVIN || filter =3D=3D 1 || filter > EVIN_FILTER_MAX) + return -EINVAL; + + /* set EVENTx pull-up edge trigger */ + ret =3D rv8803_read_reg(client, evin_cfg_reg[evin]); + if (ret < 0) + return ret; + reg_mask =3D ret; + if (pullup_down !=3D -1) { + reg_mask &=3D ~RX8901_EVENTx_CFG_PUPD; + reg_mask |=3D FIELD_PREP(RX8901_EVENTx_CFG_PUPD, pullup_down); + } + if (trigger !=3D -1) { + reg_mask &=3D ~RX8901_EVENTx_CFG_POL; + reg_mask |=3D FIELD_PREP(RX8901_EVENTx_CFG_POL, trigger); + } + ret =3D rv8803_write_reg(client, evin_cfg_reg[evin], reg_mask); + if (ret < 0) + return ret; + + /* set EVENTx noise filter */ + if (filter !=3D -1) { + ret =3D rv8803_write_reg(client, evin_flt_reg[evin], filter); + if (ret < 0) + return ret; + } + + return 0; +} + +static ssize_t enable_store(struct device *dev, struct device_attribute *a= ttr, const char *buf, + size_t count) +{ + int ret; + int i; + unsigned long tmo; + u8 reg; + u8 reg_mask; + struct rv8803_data *rv8803 =3D dev_get_drvdata(dev->parent); + struct i2c_client *client =3D rv8803->client; + + /* EVINxCPEN | EVINxEN */; + const u8 reg_mask_evin_en =3D GENMASK(5, 3) | GENMASK(2, 0); + + bool enable =3D (strstr(buf, "1") =3D=3D buf) ? true : false; + + guard(mutex)(&rv8803->flags_lock); + + /* check if event detection status match requested mode */ + ret =3D rv8803_read_reg(client, RX8901_EVIN_EN); + if (ret < 0) + return ret; + + /* requested mode match current state -> nothing to do */ + if (ret =3D=3D (enable ? reg_mask_evin_en : 0)) + return count; + + dev_info(&client->dev, "%s time-stamp event detection\n", + (enable) ? "configure" : "disable"); + + /* 1. disable event detection interrupt */ + ret =3D rv8803_read_reg(rv8803->client, RV8803_CTRL); + if (ret < 0) + return ret; + ret =3D rv8803_write_reg(rv8803->client, RV8803_CTRL, ret & ~RV8803_CTRL_= EIE); + if (ret) + return ret; + + /* 2. disable events for configuration */ + ret =3D rv8803_write_reg(client, RX8901_EVIN_EN, 0); + if (ret < 0) + return ret; + + /* for disable no configuration is needed */ + if (!enable) + return count; + + /* 3. set EVENTx pull-up edge trigger and noise filter */ + for (i =3D 0; i < NO_OF_EVIN; ++i) { + ret =3D rv8803_ts_event_write_evin(i, rv8803, pull_up_1M, falling_edge, = 0); + if (ret < 0) + return ret; + } + + /* 4. enable EVENTx interrupt and VBATL,VDDL */ + ret =3D rv8803_read_reg(client, RX8901_EVNT_INTE); + if (ret < 0) + return ret; + reg_mask =3D BIT(5) | BIT(6) | BIT(7); /* EVINxIEN 1-3 */ + reg_mask |=3D BIT(3) | BIT(1); /* VBATLIEN | VDDLIEN */ + reg =3D (ret & ~reg_mask) | reg_mask; + ret =3D rv8803_write_reg(client, RX8901_EVNT_INTE, reg); + if (ret < 0) + return ret; + + /* + * 5. set BUF1 inhibit and interrupt every 1 event + * NOTE: BUF2-3 are not used in FIFO-mode + */ + ret =3D rv8803_write_reg(client, RX8901_BUF1_CFG1, 0x01); + if (ret < 0) + return ret; + + /* 6. clean and init for BUFx and event counter 1-3 and trigger cmd */ + reg =3D BIT(7) | GENMASK(6, 4); + reg |=3D BIT(0); /* CMDTRGEN */ + ret =3D rv8803_write_reg(client, RX8901_WRCMD_CFG, reg); + if (ret < 0) + return ret; + ret =3D rv8803_write_reg(client, RX8901_WRCMD_TRG, 0xFF); + if (ret < 0) + return ret; + tmo =3D jiffies + msecs_to_jiffies(100); /* timeout 100ms */ + do { + usleep_range(10, 2000); + ret =3D rv8803_read_reg(client, RX8901_WRCMD_TRG); + if (ret < 0) + return ret; + if (time_after(jiffies, tmo)) + return -EBUSY; + } while (ret); + + /* 7. enable event detection interrupt */ + ret =3D rv8803_read_reg(rv8803->client, RV8803_CTRL); + if (ret < 0) + return ret; + ret =3D rv8803_write_reg(rv8803->client, RV8803_CTRL, ret | RV8803_CTRL_E= IE); + if (ret) + return ret; + + /* 8. / 10. enable events for configuration in FIFO mode */ + ret =3D rv8803_write_reg(client, RX8901_EVIN_EN, reg_mask_evin_en); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t read_show(struct device *dev, struct device_attribute *attr= , char *buf) +{ + int ret; + int ev_idx; + int num_events; + unsigned long long time_s; + int time_ms; + int offset =3D 0; + u8 reg_mask; + u8 data[10]; + struct rtc_time tm; + + struct i2c_client *client =3D to_i2c_client(dev->parent); + struct rv8803_data *rv8803 =3D dev_get_drvdata(dev->parent); + + guard(mutex)(&rv8803->flags_lock); + + /* + * For detailed description see datasheet: + * - Reading Time Stamp Data (FIFO mode) + */ + + /* check interrupt source is from event 1-3 */ + ret =3D rv8803_read_reg(client, RX8901_EVNT_INTF); + if (ret < 0) + return ret; + + /* CHECK for EVF bit */ + if (ret & BIT(2)) { + /* clear EVINxF 1-3 */ + reg_mask =3D BIT(5) | BIT(6) | BIT(7); + ret =3D rv8803_write_reg(client, RX8901_EVNT_INTF, ret & ~reg_mask); + if (ret < 0) + return ret; + } + + /* check interrupt source is from event 1-3 */ + ret =3D rv8803_read_reg(client, RX8901_BUF_INTF); + if (ret < 0) + return ret; + if (ret & RX8901_BUF_INTF_BUF1F) { + /* disable interrupts */ + ret =3D rv8803_read_reg(client, RV8803_CTRL); + if (ret < 0) + return ret; + ret =3D rv8803_write_reg(client, RV8803_CTRL, ret & ~RV8803_CTRL_EIE); + if (ret < 0) + return ret; + + /* clear interrupt flag */ + ret =3D rv8803_read_reg(client, RX8901_BUF_INTF); + if (ret < 0) + return ret; + ret =3D rv8803_write_reg(client, RX8901_BUF_INTF, ret & ~RX8901_BUF_INTF= _BUF1F); + if (ret < 0) + return ret; + } + + /* test if there are events available */ + ret =3D rv8803_read_reg(client, RX8901_BUF1_STAT); + if (ret < 0) + return ret; + num_events =3D ret & RX8901_BUFx_STAT_PTR; + + if (num_events) { + ret =3D rv8803_read_regs(client, 0x60, ARRAY_SIZE(data), data); + if (ret < 0) + return ret; + + tm.tm_sec =3D bcd2bin(data[2]); + tm.tm_min =3D bcd2bin(data[3]); + tm.tm_hour =3D bcd2bin(data[4]); + tm.tm_mday =3D bcd2bin(data[5]); + tm.tm_mon =3D bcd2bin(data[6]) - 1; + tm.tm_year =3D bcd2bin(data[7]) + 100; + tm.tm_wday =3D -1; + tm.tm_yday =3D -1; + tm.tm_isdst =3D -1; + + ret =3D rtc_valid_tm(&tm); + if (ret) + return ret; + + /* calculate 1/1024 -> ms */ + time_ms =3D (1000 * ((data[1] << 2) | (data[0] >> 6))) / 1024; + time_s =3D rtc_tm_to_time64(&tm); + + offset +=3D snprintf(buf + offset, PAGE_SIZE - offset, "%llu.%03d", time= _s, time_ms); + for (ev_idx =3D 0; trg_status_txt[ev_idx].txt; ++ev_idx) + if (data[9] & trg_status_txt[ev_idx].val) + offset +=3D snprintf(buf + offset, PAGE_SIZE - offset, " %s=3D%d", + trg_status_txt[ev_idx].txt, + !!(trg_status_txt[ev_idx].val & data[8])); + offset +=3D snprintf(buf + offset, PAGE_SIZE - offset, "\n"); + + /* according to the datasheet we have to wait for 1ms */ + usleep_range(1000, 2000); + } + + /* re-enable interrupts */ + ret =3D rv8803_read_reg(client, RV8803_CTRL); + if (ret < 0) + return ret; + ret =3D rv8803_write_reg(client, RV8803_CTRL, ret | RV8803_CTRL_EIE); + if (ret < 0) + return ret; + + return offset; +} + +static DEVICE_ATTR_WO(enable); +static DEVICE_ATTR_RO(read); + +static struct attribute *rv8803_rtc_event_attrs[] =3D { + &dev_attr_enable.attr, + &dev_attr_read.attr, + NULL +}; + +static const struct attribute_group rv8803_rtc_sysfs_event_files =3D { + .name =3D "tamper", + .attrs =3D rv8803_rtc_event_attrs, +}; + static const struct rtc_class_ops rv8803_rtc_ops =3D { .read_time =3D rv8803_get_time, .set_time =3D rv8803_set_time, @@ -854,6 +1125,12 @@ static int rv8803_probe(struct i2c_client *client) if (err) return err; =20 + if (rv8803->type =3D=3D rx_8901) { + err =3D rtc_add_group(rv8803->rtc, &rv8803_rtc_sysfs_event_files); + if (err) + return err; + } + rv8803->rtc->ops =3D &rv8803_rtc_ops; rv8803->rtc->range_min =3D RTC_TIMESTAMP_BEGIN_2000; rv8803->rtc->range_max =3D RTC_TIMESTAMP_END_2099; --=20 2.39.5 From nobody Sat Feb 7 22:55:21 2026 Received: from EUR03-DBA-obe.outbound.protection.outlook.com (mail-dbaeur03on2071.outbound.protection.outlook.com [40.107.104.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A9DA82080EC; 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charset="utf-8" Extend sysfs to trigger an internal time-stamp event. The trigger function can be used from an application to trigger an internal time-stamp event. Signed-off-by: Markus Burri --- drivers/rtc/rtc-rv8803.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c index 754657d..c479cc7 100644 --- a/drivers/rtc/rtc-rv8803.c +++ b/drivers/rtc/rtc-rv8803.c @@ -937,12 +937,45 @@ static ssize_t read_show(struct device *dev, struct d= evice_attribute *attr, char return offset; } =20 +static ssize_t trigger_store(struct device *dev, struct device_attribute *= attr, const char *buf, + size_t count) +{ + struct rv8803_data *rv8803 =3D dev_get_drvdata(dev->parent); + struct i2c_client *client =3D rv8803->client; + int ret; + unsigned long tmo; + + guard(mutex)(&rv8803->flags_lock); + + /* CMDTRGEN */ + ret =3D rv8803_write_reg(client, RX8901_WRCMD_CFG, BIT(0)); + if (ret < 0) + return ret; + ret =3D rv8803_write_reg(client, RX8901_WRCMD_TRG, 0xFF); + if (ret < 0) + return ret; + + tmo =3D jiffies + msecs_to_jiffies(100); /* timeout 100ms */ + do { + usleep_range(10, 2000); 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charset="utf-8" Make the following settings via sysfs configurable: - For the input pins: input resistor, trigger edge, de-jitter filter. - For the buffer: overwrite or inhibit mode for the FIFO. Signed-off-by: Markus Burri --- drivers/rtc/rtc-rv8803.c | 262 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 262 insertions(+) diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c index c479cc7..cc8aa53 100644 --- a/drivers/rtc/rtc-rv8803.c +++ b/drivers/rtc/rtc-rv8803.c @@ -681,6 +681,31 @@ static int rv8803_nvram_read(void *priv, unsigned int = offset, return 0; } =20 +static int cfg2val(const struct cfg_val_txt *cfg, const char *text, u8 *va= lue) +{ + if (!value) + return -EINVAL; + + do { + if (strcasecmp(cfg->txt, text) =3D=3D 0) { + *value =3D cfg->val; + return 0; + } + } while (++cfg && cfg->txt); + + return -EINVAL; +} + +static char *cfg2txt(const struct cfg_val_txt *cfg, u8 value) +{ + do { + if (cfg->val =3D=3D value) + return cfg->txt; + } while (++cfg && cfg->txt); + + return NULL; +} + static int rv8803_ts_event_write_evin(int evin, struct rv8803_data *rv8803= , int pullup_down, int trigger, int filter) { @@ -719,6 +744,31 @@ static int rv8803_ts_event_write_evin(int evin, struct= rv8803_data *rv8803, int return 0; } =20 +static int rv8803_ts_event_read_evin(int evin, struct rv8803_data *rv8803, + int *pullup_down, int *trigger, int *filter) + +{ + int ret; + struct i2c_client *client =3D rv8803->client; + + /* get EVENTx pull-up edge trigger */ + ret =3D rv8803_read_reg(client, evin_cfg_reg[evin]); + if (ret < 0) + return ret; + + *pullup_down =3D FIELD_GET(RX8901_EVENTx_CFG_PUPD, ret); + *trigger =3D FIELD_GET(RX8901_EVENTx_CFG_POL, ret); + + /* get EVENTx noise filter */ + ret =3D rv8803_read_reg(client, evin_flt_reg[evin]); + if (ret < 0) + return ret; + + *filter =3D ret; + + return 0; +} + static ssize_t enable_store(struct device *dev, struct device_attribute *a= ttr, const char *buf, size_t count) { @@ -968,14 +1018,226 @@ static ssize_t trigger_store(struct device *dev, st= ruct device_attribute *attr, return count; } =20 +static ssize_t cfg_evin_available_show(struct device *dev, struct device_a= ttribute *attr, char *buf) +{ + int i; + int offset =3D 0; + + offset +=3D sprintf(buf + offset, "pull-resistor:\n"); + + for (i =3D 0; pull_resistor_txt[i].txt; ++i) + if (!pull_resistor_txt[i].hide) + offset +=3D sprintf(buf + offset, " %s\n", cfg2txt(pull_resistor_txt, = i)); + offset +=3D sprintf(buf + offset, "\n"); + + offset +=3D sprintf(buf + offset, "trigger:\n"); + for (i =3D 0; trigger_txt[i].txt; ++i) + if (!trigger_txt[i].hide) + offset +=3D sprintf(buf + offset, " %s\n", cfg2txt(trigger_txt, i)); + offset +=3D sprintf(buf + offset, "\n"); + + offset +=3D sprintf(buf + offset, "filter [ms]:\n"); + for (i =3D 0; i <=3D EVIN_FILTER_MAX; ++i) + if (i !=3D 1) + offset +=3D sprintf(buf + offset, " %d\n", EVIN_FILTER_FACTOR * i); + + return offset; +} + +static ssize_t cfg_evin_show(struct device *dev, int event, char *buf) +{ + int err; + struct rv8803_data *rv8803 =3D dev_get_drvdata(dev->parent); + + int pullup_down; + int trigger; + int filter; + + --event; + if (event >=3D NO_OF_EVIN) + return -ENOENT; + + guard(mutex)(&rv8803->flags_lock); + err =3D rv8803_ts_event_read_evin(event, rv8803, + &pullup_down, &trigger, &filter); + if (err) + return err; + + return sprintf(buf, "pull-resistor=3D%s, trigger=3D%s, filter=3D%dms\n", + cfg2txt(pull_resistor_txt, pullup_down), + cfg2txt(trigger_txt, trigger), + EVIN_FILTER_FACTOR * filter); +} + +static ssize_t cfg_evin1_show(struct device *dev, struct device_attribute = *attr, char *buf) +{ + return cfg_evin_show(dev, 1, buf); +} + +static ssize_t cfg_evin2_show(struct device *dev, struct device_attribute = *attr, char *buf) +{ + return cfg_evin_show(dev, 2, buf); +} + +static ssize_t cfg_evin3_show(struct device *dev, struct device_attribute = *attr, char *buf) +{ + return cfg_evin_show(dev, 3, buf); +} + +static ssize_t cfg_evin_store(struct device *dev, int event, const char *b= uf, size_t count) +{ + int err; + struct rv8803_data *rv8803 =3D dev_get_drvdata(dev->parent); + + char *buf_cpy; + char *token; + const char *startptr; + int pullup_down =3D -1; + int trigger =3D -1; + int filter =3D -1; + u8 v; + + --event; + if (event >=3D NO_OF_EVIN) + return -ENOENT; + + buf_cpy =3D kmalloc(count + 1, GFP_KERNEL); + if (!buf_cpy) + return -ENOMEM; + + strscpy(buf_cpy, buf, count); + token =3D buf_cpy; + while ((startptr =3D strsep(&token, " ,\n"))) { + if (strstr(startptr, "pull-resistor=3D") =3D=3D startptr) + if (cfg2val(pull_resistor_txt, strchr(startptr, '=3D') + 1, &v) =3D=3D = 0) + pullup_down =3D v; + if (strstr(startptr, "trigger=3D") =3D=3D startptr) + if (cfg2val(trigger_txt, strchr(startptr, '=3D') + 1, &v) =3D=3D 0) + trigger =3D v; + if (strstr(startptr, "filter=3D") =3D=3D startptr) + filter =3D strtoul(strchr(startptr, '=3D') + 1, NULL, 0) / EVIN_FILTER_= FACTOR; + } + + kfree(buf_cpy); + + guard(mutex)(&rv8803->flags_lock); + err =3D rv8803_ts_event_write_evin(event, rv8803, pullup_down, trigger, f= ilter); + if (err) + return err; + + return count; +} + +static ssize_t cfg_evin1_store(struct device *dev, struct device_attribute= *attr, const char *buf, + size_t count) +{ + return cfg_evin_store(dev, 1, buf, count); +} + +static ssize_t cfg_evin2_store(struct device *dev, struct device_attribute= *attr, const char *buf, + size_t count) +{ + return cfg_evin_store(dev, 2, buf, count); +} + +static ssize_t cfg_evin3_store(struct device *dev, struct device_attribute= *attr, const char *buf, + size_t count) +{ + return cfg_evin_store(dev, 3, buf, count); +} + +static ssize_t cfg_buf_available_show(struct device *dev, struct device_at= tribute *attr, char *buf) +{ + int i; + int offset =3D 0; + + offset +=3D sprintf(buf + offset, "mode:\n"); + for (i =3D 0; buffer_mode_txt[i].txt; ++i) + if (!buffer_mode_txt[i].hide) + offset +=3D sprintf(buf + offset, " %s\n", cfg2txt(buffer_mode_txt, i)= ); + + return offset; +} + +static ssize_t cfg_buf_show(struct device *dev, struct device_attribute *a= ttr, char *buf) +{ + int ret; + struct i2c_client *client =3D to_i2c_client(dev->parent); + struct rv8803_data *rv8803 =3D dev_get_drvdata(dev->parent); + + guard(mutex)(&rv8803->flags_lock); + + ret =3D rv8803_read_reg(client, RX8901_BUF1_CFG1); + if (ret < 0) + return ret; + + return sprintf(buf, "mode:%s\n", + cfg2txt(buffer_mode_txt, FIELD_GET(BIT(6), ret))); +} + +static ssize_t cfg_buf_store(struct device *dev, struct device_attribute *= attr, const char *buf, + size_t count) +{ + int ret; + char *buf_cpy; + char *token; + char *startptr; + int mode =3D -1; + u8 v; + + struct i2c_client *client =3D to_i2c_client(dev->parent); + struct rv8803_data *rv8803 =3D dev_get_drvdata(dev->parent); + + buf_cpy =3D kmalloc(count + 1, GFP_KERNEL); + if (!buf_cpy) + return -ENOMEM; + + strscpy(buf_cpy, buf, count); + token =3D buf_cpy; + while ((startptr =3D strsep(&token, " ,\n"))) { + if (strstr(startptr, "mode:") =3D=3D startptr) + if (cfg2val(buffer_mode_txt, strchr(startptr, ':') + 1, &v) =3D=3D 0) + mode =3D v; + } + + kfree(buf_cpy); + + if (mode !=3D -1) { + guard(mutex)(&rv8803->flags_lock); + + ret =3D rv8803_read_reg(client, RX8901_BUF1_CFG1); + if (ret < 0) + return ret; + + ret &=3D ~BIT(6); + ret |=3D FIELD_PREP(BIT(6), mode); + ret =3D rv8803_write_reg(client, RX8901_BUF1_CFG1, ret); + if (ret < 0) + return ret; + } + return count; +} + static DEVICE_ATTR_WO(enable); static DEVICE_ATTR_RO(read); static DEVICE_ATTR_WO(trigger); +static DEVICE_ATTR_RO(cfg_evin_available); 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charset="utf-8" Add sysfs functionality to read the status and configuration. The functions provide the number of stored timestamp events, the current EVIN pin configuration and the enabled/disabled status. Signed-off-by: Markus Burri --- drivers/rtc/rtc-rv8803.c | 73 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c index cc8aa53..5d31604 100644 --- a/drivers/rtc/rtc-rv8803.c +++ b/drivers/rtc/rtc-rv8803.c @@ -1218,6 +1218,77 @@ static ssize_t cfg_buf_store(struct device *dev, str= uct device_attribute *attr, return count; } =20 +static ssize_t status_show(struct device *dev, struct device_attribute *at= tr, + char *buf) +{ + int evin_en, evin_cfg, evin_flt, buf1_cfg, buf1_stat, buf_ovwf; + int i; + int offset =3D 0; + u8 ev_pullupdown[NO_OF_EVIN]; + u8 ev_trigger[NO_OF_EVIN]; + int ev_filter[NO_OF_EVIN]; + + struct i2c_client *client =3D to_i2c_client(dev->parent); + struct rv8803_data *rv8803 =3D dev_get_drvdata(dev->parent); + + guard(mutex)(&rv8803->flags_lock); + + evin_en =3D rv8803_read_reg(client, RX8901_EVIN_EN); + if (evin_en < 0) + return evin_en; + + for (i =3D 0; i < NO_OF_EVIN; ++i) { + evin_cfg =3D rv8803_read_reg(client, evin_cfg_reg[i]); + evin_flt =3D rv8803_read_reg(client, evin_flt_reg[i]); + if (evin_cfg < 0 || evin_flt < 0) + return -EIO; + + ev_pullupdown[i] =3D FIELD_GET(RX8901_EVENTx_CFG_PUPD, evin_cfg); + ev_trigger[i] =3D FIELD_GET(RX8901_EVENTx_CFG_POL, evin_cfg); + ev_filter[i] =3D EVIN_FILTER_FACTOR * evin_flt; + } + + offset +=3D sprintf(buf + offset, "Mode: %s\n\n", + FIELD_GET(BIT(6), evin_en) ? "direct" : "fifo"); + offset +=3D sprintf(buf + offset, "Event config:\n"); + offset +=3D sprintf(buf + offset, " %-13s %-7s %-7s %-7s\n", "", "EVIN1= ", "EVIN2", "EVIN3"); + offset +=3D sprintf(buf + offset, " %-13s %-7ld %-7ld %-7ld\n", "Enable= ", + FIELD_GET(BIT(0), evin_en), FIELD_GET(BIT(1), evin_en), + FIELD_GET(BIT(2), evin_en)); + offset +=3D sprintf(buf + offset, " %-13s %-7ld %-7ld %-7ld\n", "Captur= e", + FIELD_GET(BIT(3), evin_en), FIELD_GET(BIT(4), evin_en), + FIELD_GET(BIT(5), evin_en)); + + offset +=3D sprintf(buf + offset, " %-13s %-7s %-7s %-7s\n", "Pull-resi= stor", + cfg2txt(pull_resistor_txt, ev_pullupdown[0]), + cfg2txt(pull_resistor_txt, ev_pullupdown[1]), + cfg2txt(pull_resistor_txt, ev_pullupdown[2])); + offset +=3D sprintf(buf + offset, " %-13s %-7s %-7s %-7s\n", "Edge", + cfg2txt(trigger_txt, ev_trigger[0]), + cfg2txt(trigger_txt, ev_trigger[1]), + cfg2txt(trigger_txt, ev_trigger[2])); + offset +=3D sprintf(buf + offset, " %-13s %-7d %-7d %-7d\n\n", "Filter = [ms]", + ev_filter[0], ev_filter[1], ev_filter[2]); + + buf1_cfg =3D rv8803_read_reg(client, RX8901_BUF1_CFG1); + buf1_stat =3D rv8803_read_reg(client, RX8901_BUF1_STAT); + buf_ovwf =3D rv8803_read_reg(client, RX8901_BUF_OVWF); + if (buf1_stat < 0 || buf1_stat < 0 || buf_ovwf < 0) + return -EIO; + + offset +=3D sprintf(buf + offset, "Buffer config:\n"); + offset +=3D sprintf(buf + offset, " %-13s %-10s\n", "Mode", + (FIELD_GET(BIT(6), buf1_cfg) ? "overwrite" : "inhibit")); + offset +=3D sprintf(buf + offset, " %-13s %-10s\n", "Status", + (FIELD_GET(BIT(7), buf1_stat) ? "full" : "free")); + offset +=3D sprintf(buf + offset, " %-13s %-10ld\n", "Overrun", + (FIELD_GET(BIT(4), buf_ovwf))); + offset +=3D sprintf(buf + offset, " %-13s %-10ld\n", "No of data", + (FIELD_GET(GENMASK(5, 0), buf1_stat))); + + return offset; +} + static DEVICE_ATTR_WO(enable); static DEVICE_ATTR_RO(read); static DEVICE_ATTR_WO(trigger); @@ -1227,6 +1298,7 @@ static DEVICE_ATTR_RW(cfg_evin1); static DEVICE_ATTR_RW(cfg_evin2); static DEVICE_ATTR_RW(cfg_evin3); static DEVICE_ATTR_RW(cfg_buf); +static DEVICE_ATTR_RO(status); =20 static struct attribute *rv8803_rtc_event_attrs[] =3D { &dev_attr_enable.attr, @@ -1238,6 +1310,7 @@ static struct attribute *rv8803_rtc_event_attrs[] =3D= { &dev_attr_cfg_evin2.attr, &dev_attr_cfg_evin3.attr, &dev_attr_cfg_buf.attr, + &dev_attr_status.attr, NULL }; =20 --=20 2.39.5