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[213.225.2.150]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4904527f7f7sm300779285e9.7.2026.05.24.14.56.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 24 May 2026 14:56:31 -0700 (PDT) From: Javier Carrasco Date: Sun, 24 May 2026 23:53:58 +0200 Subject: [PATCH v3 4/4] iio: light: veml6031x00: add support for events and trigger Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260524-veml6031x00-v3-4-29165609b2b5@gmail.com> References: <20260524-veml6031x00-v3-0-29165609b2b5@gmail.com> In-Reply-To: <20260524-veml6031x00-v3-0-29165609b2b5@gmail.com> To: Jonathan Cameron , Lars-Peter Clausen , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Rishi Gupta , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , Matti Vaittinen Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Javier Carrasco , Jonathan Cameron X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1779659783; l=19949; i=javier.carrasco.cruz@gmail.com; s=20260111; h=from:subject:message-id; bh=Zw8f5Wm7witufhXEpKjWVeHqRA7CE8TpbWK1NknESs4=; b=P9pBJS5i/fggXlVwdN0WLVwOmTZJfUKW+2uVmfE6fM+BjS2IaM0hz+/BDIsAjrsSKGu40pvtp 2nTvCHFXxL9D+KUD/W83wqFUK8GhulM9gssR8z1dRWRHXeeBy1G+ANx X-Developer-Key: i=javier.carrasco.cruz@gmail.com; a=ed25519; pk=Lge8w8xidNSf/INy7JAIbAW+Hezkp3nsBh2OjKL7lLU= The device provides a shared interrupt line for to notify events and data ready, which can be used as a trigger. The interrupt line is not a requirement for the device to work. Implement variants for the cases whether the interrupt line is provided or not. Signed-off-by: Javier Carrasco --- drivers/iio/light/veml6031x00.c | 442 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 438 insertions(+), 4 deletions(-) diff --git a/drivers/iio/light/veml6031x00.c b/drivers/iio/light/veml6031x00.c index 9968d4414dc9..c57aaa29abf3 100644 --- a/drivers/iio/light/veml6031x00.c +++ b/drivers/iio/light/veml6031x00.c @@ -7,12 +7,16 @@ #include #include +#include #include +#include #include #include #include #include +#include #include +#include #include #include #include @@ -20,16 +24,29 @@ /* Device registers */ #define VEML6031X00_REG_CONF0 0x00 #define VEML6031X00_REG_CONF1 0x01 +#define VEML6031X00_REG_WH_L 0x04 +#define VEML6031X00_REG_WH_H 0x05 +#define VEML6031X00_REG_WL_L 0x06 +#define VEML6031X00_REG_WL_H 0x07 #define VEML6031X00_REG_ALS_L 0x10 #define VEML6031X00_REG_ALS_H 0x11 #define VEML6031X00_REG_IR_L 0x12 #define VEML6031X00_REG_IR_H 0x13 #define VEML6031X00_REG_ID_L 0x14 #define VEML6031X00_REG_ID_H 0x15 +#define VEML6031X00_REG_INT 0x17 /* Bit masks for specific functionality */ #define VEML6031X00_CONF0_SD BIT(0) +#define VEML6031X00_CONF0_AF_TRIG BIT(2) +#define VEML6031X00_CONF0_AF BIT(3) #define VEML6031X00_CONF1_IR_SD BIT(7) +#define VEML6031X00_INT_TH_H BIT(1) +#define VEML6031X00_INT_TH_L BIT(2) +#define VEML6031X00_INT_DRDY BIT(3) +#define VEML6031X00_INT_MASK (VEML6031X00_INT_TH_L | \ + VEML6031X00_INT_TH_H | \ + VEML6031X00_INT_DRDY) enum veml6031x00_scan { VEML6031X00_SCAN_ALS, @@ -39,8 +56,10 @@ enum veml6031x00_scan { struct veml6031x00_rf { struct regmap_field *gain; + struct regmap_field *int_en; struct regmap_field *it; struct regmap_field *pd_div4; + struct regmap_field *pers; }; struct veml6031x00_chip { @@ -52,8 +71,14 @@ struct veml6031x00_data { struct device *dev; struct iio_gts gts; struct regmap *regmap; + struct iio_trigger *trig; struct veml6031x00_rf rf; const struct veml6031x00_chip *chip; + /* serialize access to irq enable/disable by events and trigger */ + struct mutex lock; + int int_users; + bool ev_en; + bool trig_en; }; static const struct iio_itime_sel_mul veml6031x00_it_sel[] = { @@ -88,6 +113,17 @@ static const struct iio_gain_sel_pair veml6031x00_gain_sel[] = { GAIN_SCALE_GAIN(16, VEML6031X00_SEL_MILLI_GAIN_X2000), }; +static IIO_CONST_ATTR(in_illuminance_thresh_either_period_available, "1 2 4 8"); + +static struct attribute *veml6031x00_event_attributes[] = { + &iio_const_attr_in_illuminance_thresh_either_period_available.dev_attr.attr, + NULL +}; + +static const struct attribute_group veml6031x00_event_attr_group = { + .attrs = veml6031x00_event_attributes, +}; + /* * Two shutdown bits (SD and ALS_IR_SD) must be cleared to power on * the device. @@ -127,6 +163,23 @@ static void veml6031x00_als_shutdown_action(void *data) veml6031x00_als_shutdown(data); } +static const struct iio_event_spec veml6031x00_event_spec[] = { + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_RISING, + .mask_separate = BIT(IIO_EV_INFO_VALUE), + }, { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_FALLING, + .mask_separate = BIT(IIO_EV_INFO_VALUE), + }, { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_EITHER, + .mask_separate = BIT(IIO_EV_INFO_PERIOD) | + BIT(IIO_EV_INFO_ENABLE), + }, +}; + static const struct iio_chan_spec veml6031x00_channels[] = { { .type = IIO_LIGHT, @@ -136,6 +189,8 @@ static const struct iio_chan_spec veml6031x00_channels[] = { .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME), .info_mask_separate_available = BIT(IIO_CHAN_INFO_SCALE), + .event_spec = veml6031x00_event_spec, + .num_event_specs = ARRAY_SIZE(veml6031x00_event_spec), .scan_index = VEML6031X00_SCAN_ALS, .scan_type = { .sign = 'u', @@ -166,7 +221,9 @@ static const struct iio_chan_spec veml6031x00_channels[] = { static const struct regmap_range veml6031x00_readable_ranges[] = { regmap_reg_range(VEML6031X00_REG_CONF0, VEML6031X00_REG_CONF1), + regmap_reg_range(VEML6031X00_REG_WH_L, VEML6031X00_REG_WL_H), regmap_reg_range(VEML6031X00_REG_ALS_L, VEML6031X00_REG_ID_H), + regmap_reg_range(VEML6031X00_REG_INT, VEML6031X00_REG_INT), }; static const struct regmap_access_table veml6031x00_readable_table = { @@ -175,7 +232,7 @@ static const struct regmap_access_table veml6031x00_readable_table = { }; static const struct regmap_range veml6031x00_writable_ranges[] = { - regmap_reg_range(VEML6031X00_REG_CONF0, VEML6031X00_REG_CONF1), + regmap_reg_range(VEML6031X00_REG_CONF0, VEML6031X00_REG_WL_H), }; static const struct regmap_access_table veml6031x00_writable_table = { @@ -185,6 +242,7 @@ static const struct regmap_access_table veml6031x00_writable_table = { static const struct regmap_range veml6031x00_volatile_ranges[] = { regmap_reg_range(VEML6031X00_REG_ALS_L, VEML6031X00_REG_IR_H), + regmap_reg_range(VEML6031X00_REG_INT, VEML6031X00_REG_INT), }; static const struct regmap_access_table veml6031x00_volatile_table = { @@ -192,6 +250,15 @@ static const struct regmap_access_table veml6031x00_volatile_table = { .n_yes_ranges = ARRAY_SIZE(veml6031x00_volatile_ranges), }; +static const struct regmap_range veml6031x00_precious_ranges[] = { + regmap_reg_range(VEML6031X00_REG_INT, VEML6031X00_REG_INT), +}; + +static const struct regmap_access_table veml6031x00_precious_table = { + .yes_ranges = veml6031x00_precious_ranges, + .n_yes_ranges = ARRAY_SIZE(veml6031x00_precious_ranges), +}; + static const struct regmap_config veml6031x00_regmap_config = { .name = "veml6031x00_regmap", .reg_bits = 8, @@ -199,13 +266,20 @@ static const struct regmap_config veml6031x00_regmap_config = { .rd_table = &veml6031x00_readable_table, .wr_table = &veml6031x00_writable_table, .volatile_table = &veml6031x00_volatile_table, - .max_register = VEML6031X00_REG_ID_H, + .precious_table = &veml6031x00_precious_table, + .max_register = VEML6031X00_REG_INT, .cache_type = REGCACHE_MAPLE, }; +static const struct reg_field veml6031x00_rf_int_en = + REG_FIELD(VEML6031X00_REG_CONF0, 1, 1); + static const struct reg_field veml6031x00_rf_it = REG_FIELD(VEML6031X00_REG_CONF0, 4, 6); +static const struct reg_field veml6031x00_rf_pers = + REG_FIELD(VEML6031X00_REG_CONF1, 1, 2); + static const struct reg_field veml6031x00_rf_gain = REG_FIELD(VEML6031X00_REG_CONF1, 3, 4); @@ -224,6 +298,11 @@ static int veml6031x00_regfield_init(struct veml6031x00_data *data) return PTR_ERR(rm_field); rf->gain = rm_field; + rm_field = devm_regmap_field_alloc(dev, regmap, veml6031x00_rf_int_en); + if (IS_ERR(rm_field)) + return PTR_ERR(rm_field); + rf->int_en = rm_field; + rm_field = devm_regmap_field_alloc(dev, regmap, veml6031x00_rf_it); if (IS_ERR(rm_field)) return PTR_ERR(rm_field); @@ -234,6 +313,11 @@ static int veml6031x00_regfield_init(struct veml6031x00_data *data) return PTR_ERR(rm_field); rf->pd_div4 = rm_field; + rm_field = devm_regmap_field_alloc(dev, regmap, veml6031x00_rf_pers); + if (IS_ERR(rm_field)) + return PTR_ERR(rm_field); + rf->pers = rm_field; + return 0; } @@ -313,6 +397,30 @@ static int veml6031x00_set_it(struct iio_dev *iio, int val, int val2) return regmap_field_write(data->rf.gain, gain_sel & 0x03); } +static int veml6031x00_read_period(struct iio_dev *iio, int *val) +{ + struct veml6031x00_data *data = iio_priv(iio); + int ret, reg; + + ret = regmap_field_read(data->rf.pers, ®); + if (ret) + return ret; + + *val = 1 << reg; + + return IIO_VAL_INT; +} + +static int veml6031x00_write_period(struct iio_dev *iio, int val) +{ + struct veml6031x00_data *data = iio_priv(iio); + + if (val < 0 || val > 8 || hweight8(val) != 1) + return -EINVAL; + + return regmap_field_write(data->rf.pers, ffs(val) - 1); +} + static int veml6031x00_set_scale(struct iio_dev *iio, int val, int val2) { struct veml6031x00_data *data = iio_priv(iio); @@ -367,6 +475,51 @@ static int veml6031x00_get_scale(struct veml6031x00_data *data, int *val, return IIO_VAL_INT_PLUS_NANO; } +static int veml6031x00_read_th(struct iio_dev *iio, int *val, int *val2, int dir) +{ + struct veml6031x00_data *data = iio_priv(iio); + __le16 reg; + int ret; + + if (dir == IIO_EV_DIR_RISING) + ret = regmap_bulk_read(data->regmap, VEML6031X00_REG_WH_L, + ®, sizeof(reg)); + else + ret = regmap_bulk_read(data->regmap, VEML6031X00_REG_WL_L, + ®, sizeof(reg)); + if (ret) + return ret; + + *val = le16_to_cpu(reg); + + return IIO_VAL_INT; +} + +static int veml6031x00_write_th(struct iio_dev *iio, int val, int val2, int dir) +{ + struct veml6031x00_data *data = iio_priv(iio); + struct device *dev = data->dev; + __le16 reg = cpu_to_le16(val); + int ret; + + if (val < 0 || val > U16_MAX || val2) + return -EINVAL; + + if (dir == IIO_EV_DIR_RISING) { + ret = regmap_bulk_write(data->regmap, VEML6031X00_REG_WH_L, + ®, sizeof(reg)); + if (ret) + dev_dbg(dev, "Failed to set high threshold %d\n", ret); + } else { + ret = regmap_bulk_write(data->regmap, VEML6031X00_REG_WL_L, + ®, sizeof(reg)); + if (ret) + dev_dbg(dev, "Failed to set low threshold %d\n", ret); + } + + return ret; +} + static int veml6031x00_single_read(struct iio_dev *iio, enum iio_chan_type type, int *val) { @@ -477,13 +630,189 @@ static int veml6031x00_write_raw_get_fmt(struct iio_dev *indio_dev, } } +static int veml6031x00_set_interrupt(struct veml6031x00_data *data, bool state) + __must_hold(&data->lock) +{ + int ret; + + if (state) { + data->int_users++; + if (data->int_users > 1) + return 0; + } else { + data->int_users--; + if (data->int_users > 0) + return 0; + } + + ret = regmap_field_write(data->rf.int_en, state); + if (ret) { + if (state) + data->int_users--; + else + data->int_users++; + } + + return ret; +} + +static int veml6031x00_read_event_val(struct iio_dev *iio, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, + int *val, int *val2) +{ + switch (type) { + case IIO_EV_TYPE_THRESH: + if (dir == IIO_EV_DIR_EITHER && info == IIO_EV_INFO_PERIOD) + return veml6031x00_read_period(iio, val); + + return veml6031x00_read_th(iio, val, val2, dir); + default: + return -EINVAL; + } +} + +static int veml6031x00_write_event_val(struct iio_dev *iio, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, + int val, int val2) +{ + switch (info) { + case IIO_EV_INFO_VALUE: + return veml6031x00_write_th(iio, val, val2, dir); + case IIO_EV_INFO_PERIOD: + return veml6031x00_write_period(iio, val); + default: + return -EINVAL; + } +} + +static int veml6031x00_read_event_config(struct iio_dev *iio, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir) +{ + struct veml6031x00_data *data = iio_priv(iio); + + guard(mutex)(&data->lock); + + return data->ev_en; +} + +static int veml6031x00_write_event_config(struct iio_dev *iio, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + bool state) +{ + struct veml6031x00_data *data = iio_priv(iio); + int ret; + + guard(mutex)(&data->lock); + + /* avoid multiple increments/decrements from one source */ + if (state == data->ev_en) + return 0; + + if (state) { + ret = pm_runtime_resume_and_get(data->dev); + if (ret) + return ret; + } + + ret = veml6031x00_set_interrupt(data, state); + if (ret) { + if (state) + pm_runtime_put_autosuspend(data->dev); + return ret; + } + + data->ev_en = state; + + if (!state) + pm_runtime_put_autosuspend(data->dev); + + return 0; +} + static const struct iio_info veml6031x00_info = { .read_raw = veml6031x00_read_raw, .read_avail = veml6031x00_read_avail, .write_raw = veml6031x00_write_raw, .write_raw_get_fmt = veml6031x00_write_raw_get_fmt, + .read_event_value = veml6031x00_read_event_val, + .write_event_value = veml6031x00_write_event_val, + .read_event_config = veml6031x00_read_event_config, + .write_event_config = veml6031x00_write_event_config, + .event_attrs = &veml6031x00_event_attr_group, +}; + +static const struct iio_info veml6031x00_info_no_irq = { + .read_raw = veml6031x00_read_raw, + .read_avail = veml6031x00_read_avail, + .write_raw = veml6031x00_write_raw, + .write_raw_get_fmt = veml6031x00_write_raw_get_fmt, }; +/* AF_TRIG is reset by hardware, but the rest of the fields are persistent */ +static int veml6031x00_set_af_trig(struct veml6031x00_data *data, bool state) +{ + regcache_drop_region(data->regmap, VEML6031X00_REG_CONF0, + VEML6031X00_REG_CONF0); + + return regmap_update_bits(data->regmap, VEML6031X00_REG_CONF0, + VEML6031X00_CONF0_AF_TRIG, + FIELD_PREP(VEML6031X00_CONF0_AF_TRIG, state)); +} + +static irqreturn_t veml6031x00_interrupt(int irq, void *private) +{ + struct iio_dev *iio = private; + struct veml6031x00_data *data = iio_priv(iio); + s64 timestamp; + int ret, reg; + + ret = regmap_read(data->regmap, VEML6031X00_REG_INT, ®); + if (ret) { + dev_err(data->dev, + "Failed to read interrupt register %d\n", ret); + return IRQ_NONE; + } + + if (!(reg & VEML6031X00_INT_MASK)) + return IRQ_NONE; + + guard(mutex)(&data->lock); + + if ((reg & (VEML6031X00_INT_TH_H | VEML6031X00_INT_TH_L)) && data->ev_en) { + timestamp = iio_get_time_ns(iio); + + if (reg & VEML6031X00_INT_TH_H) + iio_push_event(iio, IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_RISING), + timestamp); + if (reg & VEML6031X00_INT_TH_L) + iio_push_event(iio, IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_FALLING), + timestamp); + } + + if ((reg & VEML6031X00_INT_DRDY) && data->trig_en) { + iio_trigger_poll_nested(data->trig); + ret = veml6031x00_set_af_trig(data, true); + if (ret) + dev_err(data->dev, "Failed to set trigger %d\n", ret); + } + + return IRQ_HANDLED; +} + static int veml6031x00_buffer_preenable(struct iio_dev *iio) { struct veml6031x00_data *data = iio_priv(iio); @@ -518,11 +847,54 @@ static int veml6031x00_buffer_postdisable(struct iio_dev *iio) return 0; } +static int veml6031x00_set_trigger_state(struct iio_trigger *trig, bool state) +{ + struct iio_dev *iio = iio_trigger_get_drvdata(trig); + struct veml6031x00_data *data = iio_priv(iio); + int ret; + + guard(mutex)(&data->lock); + + if (state == data->trig_en) + return 0; + + ret = veml6031x00_set_interrupt(data, state); + if (ret) + return ret; + + /* The AF bit must be set before setting AF_TRIG */ + ret = regmap_update_bits(data->regmap, VEML6031X00_REG_CONF0, + VEML6031X00_CONF0_AF, + FIELD_PREP(VEML6031X00_CONF0_AF, state)); + if (ret) + goto err_disable_interrupt; + + ret = veml6031x00_set_af_trig(data, state); + if (ret) + goto err_clear_af; + + data->trig_en = state; + + return 0; + +err_clear_af: + regmap_update_bits(data->regmap, VEML6031X00_REG_CONF0, + VEML6031X00_CONF0_AF, + FIELD_PREP(VEML6031X00_CONF0_AF, !state)); +err_disable_interrupt: + veml6031x00_set_interrupt(data, !state); + return ret; +} + static const struct iio_buffer_setup_ops veml6031x00_buffer_setup_ops = { .preenable = veml6031x00_buffer_preenable, .postdisable = veml6031x00_buffer_postdisable, }; +static const struct iio_trigger_ops veml6031x00_trigger_ops = { + .set_trigger_state = veml6031x00_set_trigger_state, +}; + static irqreturn_t veml6031x00_trig_handler(int irq, void *p) { struct iio_poll_func *pf = p; @@ -581,7 +953,8 @@ static int veml6031x00_hw_init(struct iio_dev *iio) { struct veml6031x00_data *data = iio_priv(iio); struct device *dev = data->dev; - int ret; + int ret, val; + __le16 reg; /* Max resolution = 6.9632 lx/cnt for gain = 0.125 and IT = 3.125ms */ ret = devm_iio_init_iio_gts(dev, 6, 963200000, @@ -593,6 +966,54 @@ static int veml6031x00_hw_init(struct iio_dev *iio) if (ret) return dev_err_probe(dev, ret, "failed to init iio gts\n"); + reg = 0; + ret = regmap_bulk_write(data->regmap, VEML6031X00_REG_WL_L, ®, sizeof(reg)); + if (ret) + return dev_err_probe(dev, ret, "Failed to set low threshold\n"); + + reg = cpu_to_le16(U16_MAX); + ret = regmap_bulk_write(data->regmap, VEML6031X00_REG_WH_L, ®, sizeof(reg)); + if (ret) + return dev_err_probe(dev, ret, "Failed to set high threshold\n"); + + ret = regmap_field_write(data->rf.int_en, 0); + if (ret) + return ret; + + ret = regmap_read(data->regmap, VEML6031X00_REG_INT, &val); + if (ret) + return dev_err_probe(dev, ret, "Failed to clear interrupts\n"); + + return 0; +} + +static int veml6031x00_setup_irq(struct i2c_client *i2c, struct iio_dev *iio) +{ + struct veml6031x00_data *data = iio_priv(iio); + struct device *dev = data->dev; + int ret; + + data->trig = devm_iio_trigger_alloc(dev, "%s-drdy%d", iio->name, + iio_device_id(iio)); + if (!data->trig) + return -ENOMEM; + + data->trig->ops = &veml6031x00_trigger_ops; + iio_trigger_set_drvdata(data->trig, iio); + + ret = devm_iio_trigger_register(dev, data->trig); + if (ret) + return ret; + + iio->trig = iio_trigger_get(data->trig); + ret = devm_request_threaded_irq(dev, i2c->irq, NULL, + veml6031x00_interrupt, + IRQF_ONESHOT, + iio->name, iio); + if (ret) + return dev_err_probe(dev, ret, "Failed to request irq %d\n", + i2c->irq); + return 0; } @@ -618,6 +1039,10 @@ static int veml6031x00_probe(struct i2c_client *i2c) data->dev = dev; data->regmap = regmap; + ret = devm_mutex_init(dev, &data->lock); + if (ret) + return ret; + ret = veml6031x00_regfield_init(data); if (ret) return dev_err_probe(dev, ret, "Failed to init regfield\n"); @@ -657,12 +1082,21 @@ static int veml6031x00_probe(struct i2c_client *i2c) iio->channels = veml6031x00_channels; iio->num_channels = ARRAY_SIZE(veml6031x00_channels); iio->modes = INDIO_DIRECT_MODE; - iio->info = &veml6031x00_info; ret = veml6031x00_hw_init(iio); if (ret) return ret; + if (i2c->irq) { + ret = veml6031x00_setup_irq(i2c, iio); + if (ret) + return ret; + + iio->info = &veml6031x00_info; + } else { + iio->info = &veml6031x00_info_no_irq; + } + ret = devm_iio_triggered_buffer_setup(dev, iio, NULL, veml6031x00_trig_handler, &veml6031x00_buffer_setup_ops); -- 2.43.0