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([136.233.9.100]) by smtp.googlemail.com with ESMTPSA id d9443c01a7336-20710ee70a1sm40882965ad.121.2024.09.09.21.51.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Sep 2024 21:51:36 -0700 (PDT) From: Abhash Jha To: linux-iio@vger.kernel.org Cc: anshulusr@gmail.com, jic23@kernel.org, lars@metafoo.de, linux-kernel@vger.kernel.org, Abhash Jha Subject: [PATCH v2 1/4] iio: light: ltr390: Added configurable sampling frequency support Date: Tue, 10 Sep 2024 10:20:26 +0530 Message-ID: <20240910045030.266946-2-abhashkumarjha123@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240910045030.266946-1-abhashkumarjha123@gmail.com> References: <20240910045030.266946-1-abhashkumarjha123@gmail.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Provied configurable sampling frequency(Measurement rate) support. Also exposed the available sampling frequency values using read_avail callback. Signed-off-by: Abhash Jha --- drivers/iio/light/ltr390.c | 68 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 66 insertions(+), 2 deletions(-) diff --git a/drivers/iio/light/ltr390.c b/drivers/iio/light/ltr390.c index 7e58b50f3..73ef4a5a0 100644 --- a/drivers/iio/light/ltr390.c +++ b/drivers/iio/light/ltr390.c @@ -39,6 +39,7 @@ #define LTR390_PART_NUMBER_ID 0xb #define LTR390_ALS_UVS_GAIN_MASK 0x07 +#define LTR390_ALS_UVS_MEAS_RATE_MASK 0x07 #define LTR390_ALS_UVS_INT_TIME_MASK 0x70 #define LTR390_ALS_UVS_INT_TIME(x) FIELD_PREP(LTR390_ALS_UVS_INT_TIME_MASK, (x)) @@ -87,6 +88,18 @@ static const struct regmap_config ltr390_regmap_config = { .val_bits = 8, }; +/* Sampling frequency is in mili Hz and mili Seconds */ +static const int ltr390_samp_freq_table[][2] = { + [0] = {40000, 25}, + [1] = {20000, 50}, + [2] = {10000, 100}, + [3] = {5000, 200}, + [4] = {2000, 500}, + [5] = {1000, 1000}, + [6] = {500, 2000}, + [7] = {500, 2000} +}; + static int ltr390_register_read(struct ltr390_data *data, u8 register_address) { struct device *dev = &data->client->dev; @@ -135,6 +148,18 @@ static int ltr390_counts_per_uvi(struct ltr390_data *data) return DIV_ROUND_CLOSEST(23 * data->gain * data->int_time_us, 10 * orig_gain * orig_int_time); } +static int ltr390_get_samp_freq(struct ltr390_data *data) +{ + int ret, value; + + ret = regmap_read(data->regmap, LTR390_ALS_UVS_MEAS_RATE, &value); + if (ret < 0) + return ret; + value &= LTR390_ALS_UVS_MEAS_RATE_MASK; + + return ltr390_samp_freq_table[value][0]; +} + static int ltr390_read_raw(struct iio_dev *iio_device, struct iio_chan_spec const *chan, int *val, int *val2, long mask) @@ -191,6 +216,10 @@ static int ltr390_read_raw(struct iio_dev *iio_device, *val = data->int_time_us; return IIO_VAL_INT; + case IIO_CHAN_INFO_SAMP_FREQ: + *val = ltr390_get_samp_freq(data); + return IIO_VAL_INT; + default: return -EINVAL; } @@ -199,6 +228,7 @@ static int ltr390_read_raw(struct iio_dev *iio_device, /* integration time in us */ static const int ltr390_int_time_map_us[] = { 400000, 200000, 100000, 50000, 25000, 12500 }; static const int ltr390_gain_map[] = { 1, 3, 6, 9, 18 }; +static const int ltr390_freq_map[] = { 40000, 20000, 10000, 5000, 2000, 1000, 500, 500 }; static const struct iio_chan_spec ltr390_channels[] = { /* UV sensor */ @@ -206,16 +236,18 @@ static const struct iio_chan_spec ltr390_channels[] = { .type = IIO_UVINDEX, .scan_index = 0, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), - .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) | BIT(IIO_CHAN_INFO_SAMP_FREQ), .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) | BIT(IIO_CHAN_INFO_SCALE) + | BIT(IIO_CHAN_INFO_SAMP_FREQ) }, /* ALS sensor */ { .type = IIO_LIGHT, .scan_index = 1, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), - .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) | BIT(IIO_CHAN_INFO_SAMP_FREQ), .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) | BIT(IIO_CHAN_INFO_SCALE) + | BIT(IIO_CHAN_INFO_SAMP_FREQ) }, }; @@ -264,6 +296,27 @@ static int ltr390_set_int_time(struct ltr390_data *data, int val) return -EINVAL; } +static int ltr390_set_samp_freq(struct ltr390_data *data, int val) +{ + int ret, idx; + + for (idx = 0; idx < ARRAY_SIZE(ltr390_samp_freq_table); idx++) { + if (ltr390_samp_freq_table[idx][0] != val) + continue; + + guard(mutex)(&data->lock); + ret = regmap_update_bits(data->regmap, + LTR390_ALS_UVS_MEAS_RATE, + LTR390_ALS_UVS_MEAS_RATE_MASK, idx); + if (ret) + return ret; + + return 0; + } + + return -EINVAL; +} + static int ltr390_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, const int **vals, int *type, int *length, long mask) { @@ -278,6 +331,11 @@ static int ltr390_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec con *type = IIO_VAL_INT; *vals = ltr390_int_time_map_us; return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_SAMP_FREQ: + *length = ARRAY_SIZE(ltr390_freq_map); + *type = IIO_VAL_INT; + *vals = ltr390_freq_map; + return IIO_AVAIL_LIST; default: return -EINVAL; } @@ -301,6 +359,12 @@ static int ltr390_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec cons return ltr390_set_int_time(data, val); + case IIO_CHAN_INFO_SAMP_FREQ: + if (val2 != 0) + return -EINVAL; + + return ltr390_set_samp_freq(data, val); + default: return -EINVAL; }