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([136.233.9.100]) by smtp.googlemail.com with ESMTPSA id 41be03b00d2f7-7e9f6c34127sm19979a12.67.2024.10.04.08.02.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Oct 2024 08:02:32 -0700 (PDT) From: Abhash Jha To: linux-iio@vger.kernel.org Cc: jic23@kernel.org, lars@metafoo.de, linux-kernel@vger.kernel.org, Abhash Jha Subject: [PATCH 1/3] iio: light: vl6180: Add configurable inter-measurement period support Date: Fri, 4 Oct 2024 20:31:46 +0530 Message-ID: <20241004150148.14033-2-abhashkumarjha123@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241004150148.14033-1-abhashkumarjha123@gmail.com> References: <20241004150148.14033-1-abhashkumarjha123@gmail.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Expose the IIO_CHAN_INFO_SAMP_FREQ attribute as a way to configure the inter-measurement period for both the IIO_DISTANCE and IIO_LIGHT channels. The inter-measurement period must be given in miliseconds. Signed-off-by: Abhash Jha --- drivers/iio/light/vl6180.c | 67 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 65 insertions(+), 2 deletions(-) diff --git a/drivers/iio/light/vl6180.c b/drivers/iio/light/vl6180.c index a1b2b3c0b..52a837644 100644 --- a/drivers/iio/light/vl6180.c +++ b/drivers/iio/light/vl6180.c @@ -38,7 +38,9 @@ #define VL6180_OUT_OF_RESET 0x016 #define VL6180_HOLD 0x017 #define VL6180_RANGE_START 0x018 +#define VL6180_RANGE_INTER_MEAS_TIME 0x01b #define VL6180_ALS_START 0x038 +#define VL6180_ALS_INTER_MEAS_TIME 0x03e #define VL6180_ALS_GAIN 0x03f #define VL6180_ALS_IT 0x040 @@ -86,6 +88,8 @@ struct vl6180_data { struct mutex lock; unsigned int als_gain_milli; unsigned int als_it_ms; + unsigned int als_meas_rate; + unsigned int range_meas_rate; }; enum { VL6180_ALS, VL6180_RANGE, VL6180_PROX }; @@ -261,12 +265,14 @@ static const struct iio_chan_spec vl6180_channels[] = { .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_INT_TIME) | BIT(IIO_CHAN_INFO_SCALE) | - BIT(IIO_CHAN_INFO_HARDWAREGAIN), + BIT(IIO_CHAN_INFO_HARDWAREGAIN) | + BIT(IIO_CHAN_INFO_SAMP_FREQ), }, { .type = IIO_DISTANCE, .address = VL6180_RANGE, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | - BIT(IIO_CHAN_INFO_SCALE), + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_SAMP_FREQ), }, { .type = IIO_PROXIMITY, .address = VL6180_PROX, @@ -333,6 +339,18 @@ static int vl6180_read_raw(struct iio_dev *indio_dev, return IIO_VAL_FRACTIONAL; + case IIO_CHAN_INFO_SAMP_FREQ: + switch (chan->type) { + case IIO_DISTANCE: + *val = data->range_meas_rate; + return IIO_VAL_INT; + case IIO_LIGHT: + *val = data->als_meas_rate; + return IIO_VAL_INT; + default: + return -EINVAL; + } + default: return -EINVAL; } @@ -412,11 +430,22 @@ static int vl6180_set_it(struct vl6180_data *data, int val, int val2) return ret; } +static int vl6180_meas_reg_val_from_ms(unsigned int period) +{ + unsigned int reg_val = 0; + + if (period > 10) + reg_val = period < 2550 ? (DIV_ROUND_CLOSEST(period, 10) - 1) : 254; + + return reg_val; +} + static int vl6180_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct vl6180_data *data = iio_priv(indio_dev); + unsigned int reg_val; switch (mask) { case IIO_CHAN_INFO_INT_TIME: @@ -427,6 +456,24 @@ static int vl6180_write_raw(struct iio_dev *indio_dev, return -EINVAL; return vl6180_set_als_gain(data, val, val2); + + case IIO_CHAN_INFO_SAMP_FREQ: + guard(mutex)(&data->lock); + switch (chan->type) { + case IIO_DISTANCE: + data->range_meas_rate = val; + reg_val = vl6180_meas_reg_val_from_ms(val); + return vl6180_write_byte(data->client, VL6180_RANGE_INTER_MEAS_TIME, reg_val); + + case IIO_LIGHT: + data->als_meas_rate = val; + reg_val = vl6180_meas_reg_val_from_ms(val); + return vl6180_write_byte(data->client, VL6180_ALS_INTER_MEAS_TIME, reg_val); + + default: + return -EINVAL; + } + default: return -EINVAL; } @@ -473,6 +520,22 @@ static int vl6180_init(struct vl6180_data *data) if (ret < 0) return ret; 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([136.233.9.100]) by smtp.googlemail.com with ESMTPSA id 41be03b00d2f7-7e9f6c34127sm19979a12.67.2024.10.04.08.02.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Oct 2024 08:02:36 -0700 (PDT) From: Abhash Jha To: linux-iio@vger.kernel.org Cc: jic23@kernel.org, lars@metafoo.de, linux-kernel@vger.kernel.org, Abhash Jha Subject: [PATCH 2/3] iio: light: vl6180: Added Interrupt support for single shot access Date: Fri, 4 Oct 2024 20:31:47 +0530 Message-ID: <20241004150148.14033-3-abhashkumarjha123@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241004150148.14033-1-abhashkumarjha123@gmail.com> References: <20241004150148.14033-1-abhashkumarjha123@gmail.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Configured the GPIO1 pin to provide output interrupts. And then the interrupts are serviced in the `vl6180_measure` function when the irq_handler signals that the reading is complete. Signed-off-by: Abhash Jha --- drivers/iio/light/vl6180.c | 64 +++++++++++++++++++++++++++++++------- 1 file changed, 52 insertions(+), 12 deletions(-) diff --git a/drivers/iio/light/vl6180.c b/drivers/iio/light/vl6180.c index 52a837644..4c2b486e2 100644 --- a/drivers/iio/light/vl6180.c +++ b/drivers/iio/light/vl6180.c @@ -33,6 +33,7 @@ #define VL6180_MODEL_ID_VAL 0xb4 /* Configuration registers */ +#define VL6180_MODE_GPIO1 0x011 #define VL6180_INTR_CONFIG 0x014 #define VL6180_INTR_CLEAR 0x015 #define VL6180_OUT_OF_RESET 0x016 @@ -70,6 +71,9 @@ /* bits of the HOLD register */ #define VL6180_HOLD_ON BIT(0) +/* bit for enabling GPIO1 Interrupt Output */ +#define VL6180_GPIO1_INTR_OUT BIT(4) + /* default value for the ALS_IT register */ #define VL6180_ALS_IT_100 0x63 /* 100 ms */ @@ -86,6 +90,7 @@ struct vl6180_data { struct i2c_client *client; struct mutex lock; + struct completion completion; unsigned int als_gain_milli; unsigned int als_it_ms; unsigned int als_meas_rate; @@ -211,6 +216,7 @@ static int vl6180_write_word(struct i2c_client *client, u16 cmd, u16 val) static int vl6180_measure(struct vl6180_data *data, int addr) { struct i2c_client *client = data->client; + unsigned long time_left; int tries = 20, ret; u16 value; @@ -221,19 +227,26 @@ static int vl6180_measure(struct vl6180_data *data, int addr) if (ret < 0) goto fail; - while (tries--) { - ret = vl6180_read_byte(client, VL6180_INTR_STATUS); - if (ret < 0) - goto fail; - - if (ret & vl6180_chan_regs_table[addr].drdy_mask) - break; - msleep(20); - } + if (client->irq) { + reinit_completion(&data->completion); + time_left = wait_for_completion_timeout(&data->completion, HZ/10); + if (time_left == 0) + return -ETIMEDOUT; + } else { + while (tries--) { + ret = vl6180_read_byte(client, VL6180_INTR_STATUS); + if (ret < 0) + goto fail; + + if (ret & vl6180_chan_regs_table[addr].drdy_mask) + break; + msleep(20); + } - if (tries < 0) { - ret = -EIO; - goto fail; + if (tries < 0) { + ret = -EIO; + goto fail; + } } /* Read result value from appropriate registers */ @@ -479,6 +492,15 @@ static int vl6180_write_raw(struct iio_dev *indio_dev, } } +static irqreturn_t vl6180_threaded_irq(int irq, void *priv) +{ + struct iio_dev *indio_dev = priv; + struct vl6180_data *data = iio_priv(indio_dev); + + complete(&data->completion); + return IRQ_HANDLED; +} + static const struct iio_info vl6180_info = { .read_raw = vl6180_read_raw, .write_raw = vl6180_write_raw, @@ -514,6 +536,11 @@ static int vl6180_init(struct vl6180_data *data) if (ret != 0x01) dev_info(&client->dev, "device is not fresh out of reset\n"); + ret = vl6180_write_byte(client, VL6180_MODE_GPIO1, + VL6180_GPIO1_INTR_OUT); + if (ret < 0) + return ret; + /* Enable ALS and Range ready interrupts */ ret = vl6180_write_byte(client, VL6180_INTR_CONFIG, VL6180_ALS_READY | VL6180_RANGE_READY); @@ -580,6 +607,19 @@ static int vl6180_probe(struct i2c_client *client) if (ret < 0) return ret; + if (client->irq) { + ret = devm_request_threaded_irq(&client->dev, client->irq, + NULL, vl6180_threaded_irq, + IRQF_ONESHOT, + indio_dev->name, indio_dev); + if (ret) { + dev_err(&client->dev, "devm_request_irq error: %d\n", ret); + return ret; + } + + init_completion(&data->completion); + } + return devm_iio_device_register(&client->dev, indio_dev); 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([136.233.9.100]) by smtp.googlemail.com with ESMTPSA id 41be03b00d2f7-7e9f6c34127sm19979a12.67.2024.10.04.08.02.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Oct 2024 08:02:39 -0700 (PDT) From: Abhash Jha To: linux-iio@vger.kernel.org Cc: jic23@kernel.org, lars@metafoo.de, linux-kernel@vger.kernel.org, Abhash Jha Subject: [PATCH 3/3] iio: light: vl6180: Add support for Continuous Mode Date: Fri, 4 Oct 2024 20:31:48 +0530 Message-ID: <20241004150148.14033-4-abhashkumarjha123@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241004150148.14033-1-abhashkumarjha123@gmail.com> References: <20241004150148.14033-1-abhashkumarjha123@gmail.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Added support for getting continuous readings from vl6180 using triggered buffer approach. The continuous mode can be enabled by enabling the buffer. Also added a trigger and appropriate checks to see that it is used with this device. Signed-off-by: Abhash Jha --- drivers/iio/light/vl6180.c | 138 +++++++++++++++++++++++++++++++++++-- 1 file changed, 134 insertions(+), 4 deletions(-) diff --git a/drivers/iio/light/vl6180.c b/drivers/iio/light/vl6180.c index 4c2b486e2..e724e752e 100644 --- a/drivers/iio/light/vl6180.c +++ b/drivers/iio/light/vl6180.c @@ -25,6 +25,10 @@ #include #include +#include +#include +#include +#include #define VL6180_DRV_NAME "vl6180" @@ -91,10 +95,16 @@ struct vl6180_data { struct i2c_client *client; struct mutex lock; struct completion completion; + struct iio_trigger *trig; unsigned int als_gain_milli; unsigned int als_it_ms; unsigned int als_meas_rate; unsigned int range_meas_rate; + + struct { + u16 chan; + aligned_u64 timestamp; + } scan; }; enum { VL6180_ALS, VL6180_RANGE, VL6180_PROX }; @@ -275,6 +285,12 @@ static const struct iio_chan_spec vl6180_channels[] = { { .type = IIO_LIGHT, .address = VL6180_ALS, + .scan_index = VL6180_ALS, + .scan_type = { + .sign = 'u', + .realbits = 16, + .storagebits = 16, + }, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_INT_TIME) | BIT(IIO_CHAN_INFO_SCALE) | @@ -283,14 +299,27 @@ static const struct iio_chan_spec vl6180_channels[] = { }, { .type = IIO_DISTANCE, .address = VL6180_RANGE, + .scan_index = VL6180_RANGE, + .scan_type = { + .sign = 'u', + .realbits = 8, + .storagebits = 8, + }, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_SAMP_FREQ), }, { .type = IIO_PROXIMITY, .address = VL6180_PROX, + .scan_index = VL6180_PROX, + .scan_type = { + .sign = 'u', + .realbits = 16, + .storagebits = 16, + }, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), - } + }, + IIO_CHAN_SOFT_TIMESTAMP(3), }; /* @@ -497,17 +526,99 @@ static irqreturn_t vl6180_threaded_irq(int irq, void *priv) struct iio_dev *indio_dev = priv; struct vl6180_data *data = iio_priv(indio_dev); - complete(&data->completion); + if (iio_buffer_enabled(indio_dev)) + iio_trigger_poll_nested(indio_dev->trig); + else + complete(&data->completion); + + return IRQ_HANDLED; +} + +static irqreturn_t vl6180_trigger_handler(int irq, void *priv) +{ + struct iio_poll_func *pf = priv; + struct iio_dev *indio_dev = pf->indio_dev; + struct vl6180_data *data = iio_priv(indio_dev); + int ret; + + for (int i = 0; i < indio_dev->masklength; i++) { + if (test_bit(i, indio_dev->active_scan_mask)) { + + ret = vl6180_chan_regs_table[i].word ? + vl6180_read_word(data->client, vl6180_chan_regs_table[i].value_reg) : + vl6180_read_byte(data->client, vl6180_chan_regs_table[i].value_reg); + if (ret < 0) + dev_err(&data->client->dev, "failed to read from value regs: %d\n", ret); + + data->scan.chan = ret; + iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, + iio_get_time_ns(indio_dev)); + } + } + + iio_trigger_notify_done(indio_dev->trig); + + /* Clear the interrupt flag after data read */ + ret = vl6180_write_byte(data->client, VL6180_INTR_CLEAR, + VL6180_CLEAR_ERROR | VL6180_CLEAR_ALS | VL6180_CLEAR_RANGE); + if (ret < 0) + dev_err(&data->client->dev, "failed to clear irq: %d\n", ret); + return IRQ_HANDLED; } +static int vl6180_validate_trigger(struct iio_dev *indio_dev, struct iio_trigger *trig) +{ + struct vl6180_data *data = iio_priv(indio_dev); + + return data->trig == trig ? 0 : -EINVAL; +} + static const struct iio_info vl6180_info = { .read_raw = vl6180_read_raw, .write_raw = vl6180_write_raw, .attrs = &vl6180_attribute_group, + .validate_trigger = vl6180_validate_trigger, }; -static int vl6180_init(struct vl6180_data *data) +static int vl6180_buffer_postenable(struct iio_dev *indio_dev) +{ + struct vl6180_data *data = iio_priv(indio_dev); + + for (int i = 0; i < indio_dev->masklength; i++) { + if (test_bit(i, indio_dev->active_scan_mask)) + return vl6180_write_byte(data->client, + vl6180_chan_regs_table[i].start_reg, + VL6180_MODE_CONT | VL6180_STARTSTOP); + } + + return -EINVAL; +} + +static int vl6180_buffer_postdisable(struct iio_dev *indio_dev) +{ + struct vl6180_data *data = iio_priv(indio_dev); + + for (int i = 0; i < indio_dev->masklength; i++) { + if (test_bit(i, indio_dev->active_scan_mask)) + return vl6180_write_byte(data->client, + vl6180_chan_regs_table[i].start_reg, + VL6180_STARTSTOP); + } + + return -EINVAL; +} + +static const struct iio_buffer_setup_ops iio_triggered_buffer_setup_ops = { + .postenable = &vl6180_buffer_postenable, + .postdisable = &vl6180_buffer_postdisable, +}; + +static const struct iio_trigger_ops vl6180_trigger_ops = { + .validate_device = iio_trigger_validate_own_device, +}; + +static int vl6180_init(struct vl6180_data *data, struct iio_dev *indio_dev) { struct i2c_client *client = data->client; int ret; @@ -547,6 +658,12 @@ static int vl6180_init(struct vl6180_data *data) if (ret < 0) return ret; + ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL, + &vl6180_trigger_handler, + &iio_triggered_buffer_setup_ops); + if (ret) + return ret; + /* Default Range inter-measurement time: 50ms * reg_val = (50 / 10 - 1) = 4 */ @@ -603,7 +720,7 @@ static int vl6180_probe(struct i2c_client *client) indio_dev->name = VL6180_DRV_NAME; indio_dev->modes = INDIO_DIRECT_MODE; - ret = vl6180_init(data); + ret = vl6180_init(data, indio_dev); if (ret < 0) return ret; @@ -618,6 +735,19 @@ static int vl6180_probe(struct i2c_client *client) } init_completion(&data->completion); + + data->trig = devm_iio_trigger_alloc(&client->dev, "%s-dev%d", + indio_dev->name, iio_device_id(indio_dev)); + if (!data->trig) + return -ENOMEM; + + data->trig->ops = &vl6180_trigger_ops; + iio_trigger_set_drvdata(data->trig, indio_dev); + ret = devm_iio_trigger_register(&client->dev, data->trig); + if (ret) + return ret; + + indio_dev->trig = iio_trigger_get(data->trig); } return devm_iio_device_register(&client->dev, indio_dev);