From: Billy Tsai <billy_tsai@aspeedtech.com> To: <jic23@kernel.org>, <lars@metafoo.de>, <joel@jms.id.au>, <andrew@aj.id.au>, <billy_tsai@aspeedtech.com>, <linux-iio@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-aspeed@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>, <Potin.Lai@quantatw.com>, <patrickw3@meta.com> Subject: [PATCH v1] iio: adc: aspeed: Support deglitch feature. Date: Mon, 25 Sep 2023 16:18:45 +0800 [thread overview] Message-ID: <20230925081845.4147424-1-billy_tsai@aspeedtech.com> (raw) Create event sysfs for applying the deglitch condition. When in_voltageY_thresh_rising_en/in_voltageY_thresh_falling_en is set to true, the driver will use the in_voltageY_thresh_rising_value and in_voltageY_thresh_falling_value as threshold values. If the ADC value falls outside this threshold, the driver will wait for the ADC sampling period and perform an additional read once to achieve the deglitching purpose. Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com> --- drivers/iio/adc/aspeed_adc.c | 193 ++++++++++++++++++++++++++++++++++- 1 file changed, 189 insertions(+), 4 deletions(-) diff --git a/drivers/iio/adc/aspeed_adc.c b/drivers/iio/adc/aspeed_adc.c index 998e8bcc06e1..9e746c81d916 100644 --- a/drivers/iio/adc/aspeed_adc.c +++ b/drivers/iio/adc/aspeed_adc.c @@ -95,6 +95,7 @@ struct aspeed_adc_model_data { bool wait_init_sequence; bool need_prescaler; bool bat_sense_sup; + bool require_extra_eoc; u8 scaler_bit_width; unsigned int num_channels; const struct aspeed_adc_trim_locate *trim_locate; @@ -120,6 +121,26 @@ struct aspeed_adc_data { int cv; bool battery_sensing; struct adc_gain battery_mode_gain; + unsigned int required_eoc_num; + u16 *upper_bound; + u16 *lower_bound; + bool *upper_en; + bool *lower_en; +}; + +static const struct iio_event_spec aspeed_adc_events[] = { + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_RISING, + .mask_separate = + BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE), + }, + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_FALLING, + .mask_separate = + BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE), + }, }; #define ASPEED_CHAN(_idx, _data_reg_addr) { \ @@ -131,6 +152,8 @@ struct aspeed_adc_data { .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ BIT(IIO_CHAN_INFO_OFFSET), \ + .event_spec = aspeed_adc_events, \ + .num_event_specs = ARRAY_SIZE(aspeed_adc_events), \ } static const struct iio_chan_spec aspeed_adc_iio_channels[] = { @@ -277,6 +300,35 @@ static int aspeed_adc_set_sampling_rate(struct iio_dev *indio_dev, u32 rate) return 0; } +static int aspeed_adc_get_voltage_raw(struct aspeed_adc_data *data, + struct iio_chan_spec const *chan) +{ + int val; + + val = readw(data->base + chan->address); + dev_dbg(data->dev, + "%d upper_bound: %d %x, lower_bound: %d %x, delay: %d * %d ns", + chan->channel, data->upper_en[chan->channel], + data->upper_bound[chan->channel], data->lower_en[chan->channel], + data->lower_bound[chan->channel], data->sample_period_ns, + data->required_eoc_num); + if (data->upper_en[chan->channel]) { + if (val >= data->upper_bound[chan->channel]) { + ndelay(data->sample_period_ns * + data->required_eoc_num); + val = readw(data->base + chan->address); + } + } + if (data->lower_en[chan->channel]) { + if (val <= data->lower_bound[chan->channel]) { + ndelay(data->sample_period_ns * + data->required_eoc_num); + val = readw(data->base + chan->address); + } + } + return val; +} + static int aspeed_adc_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) @@ -299,14 +351,15 @@ static int aspeed_adc_read_raw(struct iio_dev *indio_dev, * Experiment result is 1ms. */ mdelay(1); - *val = readw(data->base + chan->address); + *val = aspeed_adc_get_voltage_raw(data, chan); *val = (*val * data->battery_mode_gain.mult) / data->battery_mode_gain.div; /* Restore control register value */ writel(adc_engine_control_reg_val, data->base + ASPEED_REG_ENGINE_CONTROL); - } else - *val = readw(data->base + chan->address); + } else { + *val = aspeed_adc_get_voltage_raw(data, chan); + } return IIO_VAL_INT; case IIO_CHAN_INFO_OFFSET: @@ -369,9 +422,106 @@ static int aspeed_adc_reg_access(struct iio_dev *indio_dev, return 0; } +static int aspeed_adc_read_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir) +{ + struct aspeed_adc_data *data = iio_priv(indio_dev); + + switch (dir) { + case IIO_EV_DIR_RISING: + return data->upper_en[chan->channel]; + case IIO_EV_DIR_FALLING: + return data->lower_en[chan->channel]; + default: + return -EINVAL; + } +} + +static int aspeed_adc_write_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + int state) +{ + struct aspeed_adc_data *data = iio_priv(indio_dev); + + switch (dir) { + case IIO_EV_DIR_RISING: + data->upper_en[chan->channel] = state ? 1 : 0; + break; + case IIO_EV_DIR_FALLING: + data->lower_en[chan->channel] = state ? 1 : 0; + break; + default: + return -EINVAL; + } + + return 0; +} + +static int aspeed_adc_write_event_value(struct iio_dev *indio_dev, + 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) +{ + struct aspeed_adc_data *data = iio_priv(indio_dev); + + if (info != IIO_EV_INFO_VALUE) + return -EINVAL; + + switch (dir) { + case IIO_EV_DIR_RISING: + if (val >= BIT(ASPEED_RESOLUTION_BITS)) + return -EINVAL; + data->upper_bound[chan->channel] = val; + break; + case IIO_EV_DIR_FALLING: + data->lower_bound[chan->channel] = val; + break; + default: + return -EINVAL; + } + + return 0; +} + +static int aspeed_adc_read_event_value(struct iio_dev *indio_dev, + 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) +{ + struct aspeed_adc_data *data = iio_priv(indio_dev); + + if (info != IIO_EV_INFO_VALUE) + return -EINVAL; + + switch (dir) { + case IIO_EV_DIR_RISING: + *val = data->upper_bound[chan->channel]; + break; + case IIO_EV_DIR_FALLING: + *val = data->lower_bound[chan->channel]; + break; + default: + return -EINVAL; + } + + return IIO_VAL_INT; +} + static const struct iio_info aspeed_adc_iio_info = { .read_raw = aspeed_adc_read_raw, .write_raw = aspeed_adc_write_raw, + .read_event_config = &aspeed_adc_read_event_config, + .write_event_config = &aspeed_adc_write_event_config, + .read_event_value = &aspeed_adc_read_event_value, + .write_event_value = &aspeed_adc_write_event_value, .debugfs_reg_access = aspeed_adc_reg_access, }; @@ -502,6 +652,30 @@ static int aspeed_adc_probe(struct platform_device *pdev) if (IS_ERR(data->base)) return PTR_ERR(data->base); + data->upper_bound = devm_kzalloc(&pdev->dev, + sizeof(data->upper_bound) * + data->model_data->num_channels, + GFP_KERNEL); + if (!data->upper_bound) + return -ENOMEM; + data->upper_en = devm_kzalloc(&pdev->dev, + sizeof(data->upper_en) * + data->model_data->num_channels, + GFP_KERNEL); + if (!data->upper_en) + return -ENOMEM; + data->lower_bound = devm_kzalloc(&pdev->dev, + sizeof(data->lower_bound) * + data->model_data->num_channels, + GFP_KERNEL); + if (!data->lower_bound) + return -ENOMEM; + data->lower_en = devm_kzalloc(&pdev->dev, + sizeof(data->lower_en) * + data->model_data->num_channels, + GFP_KERNEL); + if (!data->lower_en) + return -ENOMEM; /* Register ADC clock prescaler with source specified by device tree. */ spin_lock_init(&data->clk_lock); snprintf(clk_parent_name, ARRAY_SIZE(clk_parent_name), "%s", @@ -632,7 +806,14 @@ static int aspeed_adc_probe(struct platform_device *pdev) adc_engine_control_reg_val |= ASPEED_ADC_CTRL_CHANNEL; writel(adc_engine_control_reg_val, data->base + ASPEED_REG_ENGINE_CONTROL); - + adc_engine_control_reg_val = + FIELD_GET(ASPEED_ADC_CTRL_CHANNEL, + readl(data->base + ASPEED_REG_ENGINE_CONTROL)); + data->required_eoc_num = hweight_long(adc_engine_control_reg_val); + if (data->model_data->require_extra_eoc && + (adc_engine_control_reg_val & + BIT(data->model_data->num_channels - 1))) + data->required_eoc_num += 12; indio_dev->name = data->model_data->model_name; indio_dev->info = &aspeed_adc_iio_info; indio_dev->modes = INDIO_DIRECT_MODE; @@ -668,6 +849,7 @@ static const struct aspeed_adc_model_data ast2400_model_data = { .need_prescaler = true, .scaler_bit_width = 10, .num_channels = 16, + .require_extra_eoc = 0, }; static const struct aspeed_adc_model_data ast2500_model_data = { @@ -680,6 +862,7 @@ static const struct aspeed_adc_model_data ast2500_model_data = { .scaler_bit_width = 10, .num_channels = 16, .trim_locate = &ast2500_adc_trim, + .require_extra_eoc = 0, }; static const struct aspeed_adc_model_data ast2600_adc0_model_data = { @@ -691,6 +874,7 @@ static const struct aspeed_adc_model_data ast2600_adc0_model_data = { .scaler_bit_width = 16, .num_channels = 8, .trim_locate = &ast2600_adc0_trim, + .require_extra_eoc = 1, }; static const struct aspeed_adc_model_data ast2600_adc1_model_data = { @@ -702,6 +886,7 @@ static const struct aspeed_adc_model_data ast2600_adc1_model_data = { .scaler_bit_width = 16, .num_channels = 8, .trim_locate = &ast2600_adc1_trim, + .require_extra_eoc = 1, }; static const struct of_device_id aspeed_adc_matches[] = { -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Billy Tsai <billy_tsai@aspeedtech.com> To: <jic23@kernel.org>, <lars@metafoo.de>, <joel@jms.id.au>, <andrew@aj.id.au>, <billy_tsai@aspeedtech.com>, <linux-iio@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-aspeed@lists.ozlabs.org>, <linux-kernel@vger.kernel.org>, <Potin.Lai@quantatw.com>, <patrickw3@meta.com> Subject: [PATCH v1] iio: adc: aspeed: Support deglitch feature. Date: Mon, 25 Sep 2023 16:18:45 +0800 [thread overview] Message-ID: <20230925081845.4147424-1-billy_tsai@aspeedtech.com> (raw) Create event sysfs for applying the deglitch condition. When in_voltageY_thresh_rising_en/in_voltageY_thresh_falling_en is set to true, the driver will use the in_voltageY_thresh_rising_value and in_voltageY_thresh_falling_value as threshold values. If the ADC value falls outside this threshold, the driver will wait for the ADC sampling period and perform an additional read once to achieve the deglitching purpose. Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com> --- drivers/iio/adc/aspeed_adc.c | 193 ++++++++++++++++++++++++++++++++++- 1 file changed, 189 insertions(+), 4 deletions(-) diff --git a/drivers/iio/adc/aspeed_adc.c b/drivers/iio/adc/aspeed_adc.c index 998e8bcc06e1..9e746c81d916 100644 --- a/drivers/iio/adc/aspeed_adc.c +++ b/drivers/iio/adc/aspeed_adc.c @@ -95,6 +95,7 @@ struct aspeed_adc_model_data { bool wait_init_sequence; bool need_prescaler; bool bat_sense_sup; + bool require_extra_eoc; u8 scaler_bit_width; unsigned int num_channels; const struct aspeed_adc_trim_locate *trim_locate; @@ -120,6 +121,26 @@ struct aspeed_adc_data { int cv; bool battery_sensing; struct adc_gain battery_mode_gain; + unsigned int required_eoc_num; + u16 *upper_bound; + u16 *lower_bound; + bool *upper_en; + bool *lower_en; +}; + +static const struct iio_event_spec aspeed_adc_events[] = { + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_RISING, + .mask_separate = + BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE), + }, + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_FALLING, + .mask_separate = + BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE), + }, }; #define ASPEED_CHAN(_idx, _data_reg_addr) { \ @@ -131,6 +152,8 @@ struct aspeed_adc_data { .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ BIT(IIO_CHAN_INFO_SAMP_FREQ) | \ BIT(IIO_CHAN_INFO_OFFSET), \ + .event_spec = aspeed_adc_events, \ + .num_event_specs = ARRAY_SIZE(aspeed_adc_events), \ } static const struct iio_chan_spec aspeed_adc_iio_channels[] = { @@ -277,6 +300,35 @@ static int aspeed_adc_set_sampling_rate(struct iio_dev *indio_dev, u32 rate) return 0; } +static int aspeed_adc_get_voltage_raw(struct aspeed_adc_data *data, + struct iio_chan_spec const *chan) +{ + int val; + + val = readw(data->base + chan->address); + dev_dbg(data->dev, + "%d upper_bound: %d %x, lower_bound: %d %x, delay: %d * %d ns", + chan->channel, data->upper_en[chan->channel], + data->upper_bound[chan->channel], data->lower_en[chan->channel], + data->lower_bound[chan->channel], data->sample_period_ns, + data->required_eoc_num); + if (data->upper_en[chan->channel]) { + if (val >= data->upper_bound[chan->channel]) { + ndelay(data->sample_period_ns * + data->required_eoc_num); + val = readw(data->base + chan->address); + } + } + if (data->lower_en[chan->channel]) { + if (val <= data->lower_bound[chan->channel]) { + ndelay(data->sample_period_ns * + data->required_eoc_num); + val = readw(data->base + chan->address); + } + } + return val; +} + static int aspeed_adc_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) @@ -299,14 +351,15 @@ static int aspeed_adc_read_raw(struct iio_dev *indio_dev, * Experiment result is 1ms. */ mdelay(1); - *val = readw(data->base + chan->address); + *val = aspeed_adc_get_voltage_raw(data, chan); *val = (*val * data->battery_mode_gain.mult) / data->battery_mode_gain.div; /* Restore control register value */ writel(adc_engine_control_reg_val, data->base + ASPEED_REG_ENGINE_CONTROL); - } else - *val = readw(data->base + chan->address); + } else { + *val = aspeed_adc_get_voltage_raw(data, chan); + } return IIO_VAL_INT; case IIO_CHAN_INFO_OFFSET: @@ -369,9 +422,106 @@ static int aspeed_adc_reg_access(struct iio_dev *indio_dev, return 0; } +static int aspeed_adc_read_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir) +{ + struct aspeed_adc_data *data = iio_priv(indio_dev); + + switch (dir) { + case IIO_EV_DIR_RISING: + return data->upper_en[chan->channel]; + case IIO_EV_DIR_FALLING: + return data->lower_en[chan->channel]; + default: + return -EINVAL; + } +} + +static int aspeed_adc_write_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + int state) +{ + struct aspeed_adc_data *data = iio_priv(indio_dev); + + switch (dir) { + case IIO_EV_DIR_RISING: + data->upper_en[chan->channel] = state ? 1 : 0; + break; + case IIO_EV_DIR_FALLING: + data->lower_en[chan->channel] = state ? 1 : 0; + break; + default: + return -EINVAL; + } + + return 0; +} + +static int aspeed_adc_write_event_value(struct iio_dev *indio_dev, + 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) +{ + struct aspeed_adc_data *data = iio_priv(indio_dev); + + if (info != IIO_EV_INFO_VALUE) + return -EINVAL; + + switch (dir) { + case IIO_EV_DIR_RISING: + if (val >= BIT(ASPEED_RESOLUTION_BITS)) + return -EINVAL; + data->upper_bound[chan->channel] = val; + break; + case IIO_EV_DIR_FALLING: + data->lower_bound[chan->channel] = val; + break; + default: + return -EINVAL; + } + + return 0; +} + +static int aspeed_adc_read_event_value(struct iio_dev *indio_dev, + 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) +{ + struct aspeed_adc_data *data = iio_priv(indio_dev); + + if (info != IIO_EV_INFO_VALUE) + return -EINVAL; + + switch (dir) { + case IIO_EV_DIR_RISING: + *val = data->upper_bound[chan->channel]; + break; + case IIO_EV_DIR_FALLING: + *val = data->lower_bound[chan->channel]; + break; + default: + return -EINVAL; + } + + return IIO_VAL_INT; +} + static const struct iio_info aspeed_adc_iio_info = { .read_raw = aspeed_adc_read_raw, .write_raw = aspeed_adc_write_raw, + .read_event_config = &aspeed_adc_read_event_config, + .write_event_config = &aspeed_adc_write_event_config, + .read_event_value = &aspeed_adc_read_event_value, + .write_event_value = &aspeed_adc_write_event_value, .debugfs_reg_access = aspeed_adc_reg_access, }; @@ -502,6 +652,30 @@ static int aspeed_adc_probe(struct platform_device *pdev) if (IS_ERR(data->base)) return PTR_ERR(data->base); + data->upper_bound = devm_kzalloc(&pdev->dev, + sizeof(data->upper_bound) * + data->model_data->num_channels, + GFP_KERNEL); + if (!data->upper_bound) + return -ENOMEM; + data->upper_en = devm_kzalloc(&pdev->dev, + sizeof(data->upper_en) * + data->model_data->num_channels, + GFP_KERNEL); + if (!data->upper_en) + return -ENOMEM; + data->lower_bound = devm_kzalloc(&pdev->dev, + sizeof(data->lower_bound) * + data->model_data->num_channels, + GFP_KERNEL); + if (!data->lower_bound) + return -ENOMEM; + data->lower_en = devm_kzalloc(&pdev->dev, + sizeof(data->lower_en) * + data->model_data->num_channels, + GFP_KERNEL); + if (!data->lower_en) + return -ENOMEM; /* Register ADC clock prescaler with source specified by device tree. */ spin_lock_init(&data->clk_lock); snprintf(clk_parent_name, ARRAY_SIZE(clk_parent_name), "%s", @@ -632,7 +806,14 @@ static int aspeed_adc_probe(struct platform_device *pdev) adc_engine_control_reg_val |= ASPEED_ADC_CTRL_CHANNEL; writel(adc_engine_control_reg_val, data->base + ASPEED_REG_ENGINE_CONTROL); - + adc_engine_control_reg_val = + FIELD_GET(ASPEED_ADC_CTRL_CHANNEL, + readl(data->base + ASPEED_REG_ENGINE_CONTROL)); + data->required_eoc_num = hweight_long(adc_engine_control_reg_val); + if (data->model_data->require_extra_eoc && + (adc_engine_control_reg_val & + BIT(data->model_data->num_channels - 1))) + data->required_eoc_num += 12; indio_dev->name = data->model_data->model_name; indio_dev->info = &aspeed_adc_iio_info; indio_dev->modes = INDIO_DIRECT_MODE; @@ -668,6 +849,7 @@ static const struct aspeed_adc_model_data ast2400_model_data = { .need_prescaler = true, .scaler_bit_width = 10, .num_channels = 16, + .require_extra_eoc = 0, }; static const struct aspeed_adc_model_data ast2500_model_data = { @@ -680,6 +862,7 @@ static const struct aspeed_adc_model_data ast2500_model_data = { .scaler_bit_width = 10, .num_channels = 16, .trim_locate = &ast2500_adc_trim, + .require_extra_eoc = 0, }; static const struct aspeed_adc_model_data ast2600_adc0_model_data = { @@ -691,6 +874,7 @@ static const struct aspeed_adc_model_data ast2600_adc0_model_data = { .scaler_bit_width = 16, .num_channels = 8, .trim_locate = &ast2600_adc0_trim, + .require_extra_eoc = 1, }; static const struct aspeed_adc_model_data ast2600_adc1_model_data = { @@ -702,6 +886,7 @@ static const struct aspeed_adc_model_data ast2600_adc1_model_data = { .scaler_bit_width = 16, .num_channels = 8, .trim_locate = &ast2600_adc1_trim, + .require_extra_eoc = 1, }; static const struct of_device_id aspeed_adc_matches[] = { -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2023-09-25 8:18 UTC|newest] Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-09-25 8:18 Billy Tsai [this message] 2023-09-25 8:18 ` [PATCH v1] iio: adc: aspeed: Support deglitch feature Billy Tsai 2023-09-28 2:34 ` Andrew Jeffery 2023-09-28 2:34 ` Andrew Jeffery 2023-10-02 8:50 ` Billy Tsai 2023-10-02 8:50 ` Billy Tsai 2023-10-03 6:52 ` Andrew Jeffery 2023-10-03 6:52 ` Andrew Jeffery 2023-10-04 17:44 ` Billy Tsai 2023-10-04 17:44 ` Billy Tsai 2023-09-30 16:45 ` Jonathan Cameron 2023-09-30 16:45 ` Jonathan Cameron 2023-10-02 2:30 ` Billy Tsai 2023-10-02 2:30 ` Billy Tsai 2023-10-02 9:39 ` Jonathan Cameron 2023-10-02 9:39 ` Jonathan Cameron 2023-10-04 17:38 ` Billy Tsai 2023-10-04 17:38 ` Billy Tsai [not found] ` <20231005150753.38e79c20@jic23-huawei> [not found] ` <SG2PR06MB33657B698EDFC3D6937997938BD6A@SG2PR06MB3365.apcprd06.prod.outlook.com> 2023-10-17 19:15 ` Jonathan Cameron 2023-10-17 19:15 ` Jonathan Cameron
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