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c=relaxed/relaxed; d=subdimension.ro; s=mail; t=1759669986; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Y29vDzVout/ALq4vqu39VhS/cwV3LKAo3f/aaUbkGGc=; b=JMeH+6CdvHcg2O5LuLb8gXdp6L/Plj3syLkL6GmEtLuiAMNRAxO9uSperDED44JTp8nP51 SpILXfquIt/Nn4ZPKFqqKBiFng4nBpRyMYtoYaLI9Qez48oufp7gC5pvzTPsC+Ygo6pKmA s84WxvI57bQahk0FZx9cxE6fplYpx7qY0JuBVYkbrsIshaFtq7OU6pvf7hhx9o+MWV37fR t1BNllHlT8PXocnaz+DCdF/MRnVBMezuN2Qj/2Euo38fiDElh4gZGXGUvUYbrzv7t1LzVx 8Ceo4MHmYqBrJ5MlJcw/d+Ixw24Qr3nRJ6Nogr37w3bMwNIwnjy7QTqkFA2k7Q== From: Petre Rodan Date: Sun, 05 Oct 2025 16:12:26 +0300 Subject: [PATCH v4 17/19] iio: accel: bma220: add LPF cut-off frequency mapping Precedence: bulk X-Mailing-List: linux-iio@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: <20251005-b4-bma220_improvements-v4-17-0f449ba31585@subdimension.ro> References: <20251005-b4-bma220_improvements-v4-0-0f449ba31585@subdimension.ro> In-Reply-To: <20251005-b4-bma220_improvements-v4-0-0f449ba31585@subdimension.ro> To: Jonathan Cameron , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: Jonathan Cameron , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; 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a=openpgp; fpr=D80A7FC176151935EC3E5FA9CF269999844E7F30 Add mapping for the low pass filter cut-off frequency. Make valid values visible for both the cut-off frequency and the scale. Signed-off-by: Petre Rodan --- v1->v2 rename variables to include unit capitalization (dB, Hz) v2->v3 make comment one-liner (Jonathan) v4 no change --- drivers/iio/accel/bma220_core.c | 59 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 58 insertions(+), 1 deletion(-) diff --git a/drivers/iio/accel/bma220_core.c b/drivers/iio/accel/bma220_core.c index 8f0cbd0aacb92a21afc57aaa350547d0c767d4b6..7109759e28397d2660f17707124a8803a254cb14 100644 --- a/drivers/iio/accel/bma220_core.c +++ b/drivers/iio/accel/bma220_core.c @@ -93,13 +93,23 @@ #define BMA220_DEVICE_NAME "bma220" +#define BMA220_COF_1000Hz 0x0 +#define BMA220_COF_500Hz 0x1 +#define BMA220_COF_250Hz 0x2 +#define BMA220_COF_125Hz 0x3 +#define BMA220_COF_64Hz 0x4 +#define BMA220_COF_32Hz 0x5 + #define BMA220_ACCEL_CHANNEL(index, reg, axis) { \ .type = IIO_ACCEL, \ .address = reg, \ .modified = 1, \ .channel2 = IIO_MOD_##axis, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ - .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ + .info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SCALE) |\ + BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ .scan_index = index, \ .scan_type = { \ .sign = 's', \ @@ -123,6 +133,7 @@ static const int bma220_scale_table[][2] = { struct bma220_data { struct regmap *regmap; struct mutex lock; + u8 lpf_3dB_freq_idx; u8 range_idx; struct iio_trigger *trig; struct { @@ -139,6 +150,16 @@ static const struct iio_chan_spec bma220_channels[] = { IIO_CHAN_SOFT_TIMESTAMP(3), }; +/* Available cut-off frequencies of the low pass filter in Hz. */ +static const int bma220_lpf_3dB_freq_Hz_table[] = { + [BMA220_COF_1000Hz] = 1000, + [BMA220_COF_500Hz] = 500, + [BMA220_COF_250Hz] = 250, + [BMA220_COF_125Hz] = 125, + [BMA220_COF_64Hz] = 64, + [BMA220_COF_32Hz] = 32, +}; + static const unsigned long bma220_accel_scan_masks[] = { BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z), 0 @@ -253,6 +274,10 @@ static int bma220_read_raw(struct iio_dev *indio_dev, *val = bma220_scale_table[index][0]; *val2 = bma220_scale_table[index][1]; return IIO_VAL_INT_PLUS_MICRO; + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: + index = data->lpf_3dB_freq_idx; + *val = bma220_lpf_3dB_freq_Hz_table[index]; + return IIO_VAL_INT; } return -EINVAL; @@ -271,6 +296,18 @@ static int bma220_find_match_2dt(const int (*tbl)[2], const int n, return -EINVAL; } +static int bma220_find_match(const int *arr, const int n, const int val) +{ + int i; + + for (i = 0; i < n; i++) { + if (arr[i] == val) + return i; + } + + return -EINVAL; +} + static int bma220_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) @@ -296,6 +333,21 @@ static int bma220_write_raw(struct iio_dev *indio_dev, return ret; data->range_idx = index; + return 0; + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: + index = bma220_find_match(bma220_lpf_3dB_freq_Hz_table, + ARRAY_SIZE(bma220_lpf_3dB_freq_Hz_table), + val); + if (index < 0) + return -EINVAL; + + ret = regmap_update_bits(data->regmap, BMA220_REG_FILTER, + BMA220_FILTER_MASK, + FIELD_PREP(BMA220_FILTER_MASK, index)); + if (ret < 0) + return ret; + data->lpf_3dB_freq_idx = index; + return 0; } @@ -313,6 +365,11 @@ static int bma220_read_avail(struct iio_dev *indio_dev, *type = IIO_VAL_INT_PLUS_MICRO; *length = ARRAY_SIZE(bma220_scale_table) * 2; return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: + *vals = (const int *)bma220_lpf_3dB_freq_Hz_table; + *type = IIO_VAL_INT; + *length = ARRAY_SIZE(bma220_lpf_3dB_freq_Hz_table); + return IIO_AVAIL_LIST; default: return -EINVAL; } -- 2.49.1