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[84.115.213.37]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a90611164d0sm1126202066b.91.2024.09.22.15.18.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 22 Sep 2024 15:18:09 -0700 (PDT) From: Javier Carrasco Date: Mon, 23 Sep 2024 00:17:58 +0200 Subject: [PATCH v2 10/10] iio: light: veml6030: add support for veml6035 Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240923-veml6035-v2-10-58c72a0df31c@gmail.com> References: <20240923-veml6035-v2-0-58c72a0df31c@gmail.com> In-Reply-To: <20240923-veml6035-v2-0-58c72a0df31c@gmail.com> To: Jonathan Cameron , Lars-Peter Clausen , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Rishi Gupta Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Jonathan Cameron , Javier Carrasco X-Mailer: b4 0.14-dev X-Developer-Signature: v=1; a=ed25519-sha256; t=1727043474; l=15350; i=javier.carrasco.cruz@gmail.com; s=20240312; h=from:subject:message-id; bh=+q0HZm1fKYjGmC3vzyj1zQ35NDKLymKJHg/syO6dFQQ=; b=pgYmNgExgYwJQGEi4oB3jaDUom+I4WeBMv8s22pwN7/cVg1cet8HES9enfRgd1OxLfLXB6n1Q YuOWWytmKTnD8FCvIPOwo3b/qtElQOnlHVITQr5Mmi2BOke46YZk19I X-Developer-Key: i=javier.carrasco.cruz@gmail.com; a=ed25519; pk=lzSIvIzMz0JhJrzLXI0HAdPwsNPSSmEn6RbS+PTS9aQ= The veml6035 is an ALS that shares most of its functionality with the veml6030, which allows for some code recycling. Some chip-specific properties differ and dedicated functions to get and set the sensor gain as well as its initialization are required. Signed-off-by: Javier Carrasco --- drivers/iio/light/Kconfig | 4 +- drivers/iio/light/veml6030.c | 291 +++++++++++++++++++++++++++++++++++++++---- 2 files changed, 266 insertions(+), 29 deletions(-) diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index 515ff46b5b82..171ccaecf5b6 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -669,12 +669,12 @@ config VCNL4035 module will be called vcnl4035. config VEML6030 - tristate "VEML6030 ambient light sensor" + tristate "VEML6030 and VEML6035 ambient light sensors" select REGMAP_I2C depends on I2C help Say Y here if you want to build a driver for the Vishay VEML6030 - ambient light sensor (ALS). + and VEML6035 ambient light sensors (ALS). To compile this driver as a module, choose M here: the module will be called veml6030. diff --git a/drivers/iio/light/veml6030.c b/drivers/iio/light/veml6030.c index 19c69bfad8cb..d5c09c148d22 100644 --- a/drivers/iio/light/veml6030.c +++ b/drivers/iio/light/veml6030.c @@ -1,13 +1,19 @@ // SPDX-License-Identifier: GPL-2.0+ /* - * VEML6030 Ambient Light Sensor + * VEML6030 and VMEL6035 Ambient Light Sensors * * Copyright (c) 2019, Rishi Gupta * + * VEML6030: * Datasheet: https://www.vishay.com/docs/84366/veml6030.pdf * Appnote-84367: https://www.vishay.com/docs/84367/designingveml6030.pdf + * + * VEML6035: + * Datasheet: https://www.vishay.com/docs/84889/veml6035.pdf + * Appnote-84944: https://www.vishay.com/docs/84944/designingveml6035.pdf */ +#include #include #include #include @@ -39,16 +45,34 @@ #define VEML6030_ALS_INT_EN BIT(1) #define VEML6030_ALS_SD BIT(0) +#define VEML6035_GAIN_M GENMASK(12, 10) +#define VEML6035_GAIN BIT(10) +#define VEML6035_DG BIT(11) +#define VEML6035_SENS BIT(12) +#define VEML6035_INT_CHAN BIT(3) +#define VEML6035_CHAN_EN BIT(2) + +struct veml603x_chip { + const char *name; + const int(*scale_vals)[][2]; + const int num_scale_vals; + const struct iio_info *info; + const struct iio_info *info_no_irq; + int (*hw_init)(struct iio_dev *indio_dev); + int (*set_als_gain)(struct iio_dev *indio_dev, int val, int val2); + int (*get_als_gain)(struct iio_dev *indio_dev, int *val, int *val2); +}; + /* * The resolution depends on both gain and integration time. The * cur_resolution stores one of the resolution mentioned in the * table during startup and gets updated whenever integration time * or gain is changed. * - * Table 'resolution and maximum detection range' in appnote 84367 + * Table 'resolution and maximum detection range' in the appnotes * is visualized as a 2D array. The cur_gain stores index of gain - * in this table (0-3) while the cur_integration_time holds index - * of integration time (0-5). + * in this table (0-3 for VEML6030, 0-5 for VEML6035) while the + * cur_integration_time holds index of integration time (0-5). */ struct veml6030_data { struct i2c_client *client; @@ -56,6 +80,7 @@ struct veml6030_data { int cur_resolution; int cur_gain; int cur_integration_time; + const struct veml603x_chip *chip; }; static const int veml6030_it_times[][2] = { @@ -69,7 +94,8 @@ static const int veml6030_it_times[][2] = { /* * Scale is 1/gain. Value 0.125 is ALS gain x (1/8), 0.25 is - * ALS gain x (1/4), 1.0 = ALS gain x 1 and 2.0 is ALS gain x 2. + * ALS gain x (1/4), 0.5 is ALS gain x (1/2), 1.0 is ALS gain x 1, + * 2.0 is ALS gain x2, and 4.0 is ALS gain x 4. */ static const int veml6030_scale_vals[][2] = { {0, 125000}, @@ -78,6 +104,15 @@ static const int veml6030_scale_vals[][2] = { {2, 0}, }; +static const int veml6035_scale_vals[][2] = { + {0, 125000}, + {0, 250000}, + {0, 500000}, + {1, 0}, + {2, 0}, + {4, 0}, +}; + /* * Persistence = 1/2/4/8 x integration time * Minimum time for which light readings must stay above configured @@ -386,6 +421,21 @@ static int veml6030_write_persistence(struct iio_dev *indio_dev, return ret; } +/* + * Cache currently set gain & update resolution. For every + * increase in the gain to next level, resolution is halved + * and vice-versa. + */ +static void veml6030_update_gain_res(struct veml6030_data *data, int gain_idx) +{ + if (data->cur_gain < gain_idx) + data->cur_resolution <<= gain_idx - data->cur_gain; + else if (data->cur_gain > gain_idx) + data->cur_resolution >>= data->cur_gain - gain_idx; + + data->cur_gain = gain_idx; +} + static int veml6030_set_als_gain(struct iio_dev *indio_dev, int val, int val2) { @@ -416,19 +466,49 @@ static int veml6030_set_als_gain(struct iio_dev *indio_dev, return ret; } - /* - * Cache currently set gain & update resolution. For every - * increase in the gain to next level, resolution is halved - * and vice-versa. - */ - if (data->cur_gain < gain_idx) - data->cur_resolution <<= gain_idx - data->cur_gain; - else if (data->cur_gain > gain_idx) - data->cur_resolution >>= data->cur_gain - gain_idx; + veml6030_update_gain_res(data, gain_idx); - data->cur_gain = gain_idx; + return 0; +} - return ret; +static int veml6035_set_als_gain(struct iio_dev *indio_dev, int val, int val2) +{ + int ret, new_gain, gain_idx; + struct veml6030_data *data = iio_priv(indio_dev); + + if (val == 0 && val2 == 125000) { + new_gain = VEML6035_SENS; + gain_idx = 5; + } else if (val == 0 && val2 == 250000) { + new_gain = VEML6035_SENS | VEML6035_GAIN; + gain_idx = 4; + } else if (val == 0 && val2 == 500000) { + new_gain = VEML6035_SENS | VEML6035_GAIN | + VEML6035_DG; + gain_idx = 3; + } else if (val == 1 && val2 == 0) { + new_gain = 0x0000; + gain_idx = 2; + } else if (val == 2 && val2 == 0) { + new_gain = VEML6035_GAIN; + gain_idx = 1; + } else if (val == 4 && val2 == 0) { + new_gain = VEML6035_GAIN | VEML6035_DG; + gain_idx = 0; + } else { + return -EINVAL; + } + + ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_CONF, + VEML6035_GAIN_M, new_gain); + if (ret) { + dev_err(&data->client->dev, "can't set als gain %d\n", ret); + return ret; + } + + veml6030_update_gain_res(data, gain_idx); + + return 0; } static int veml6030_get_als_gain(struct iio_dev *indio_dev, @@ -468,6 +548,52 @@ static int veml6030_get_als_gain(struct iio_dev *indio_dev, return IIO_VAL_INT_PLUS_MICRO; } +static int veml6035_get_als_gain(struct iio_dev *indio_dev, int *val, int *val2) +{ + int ret, reg; + struct veml6030_data *data = iio_priv(indio_dev); + + ret = regmap_read(data->regmap, VEML6030_REG_ALS_CONF, ®); + if (ret) { + dev_err(&data->client->dev, + "can't read als conf register %d\n", ret); + return ret; + } + + switch (FIELD_GET(VEML6035_GAIN_M, reg)) { + case 0: + *val = 1; + *val2 = 0; + break; + case 1: + case 2: + *val = 2; + *val2 = 0; + break; + case 3: + *val = 4; + *val2 = 0; + break; + case 4: + *val = 0; + *val2 = 125000; + break; + case 5: + case 6: + *val = 0; + *val2 = 250000; + break; + case 7: + *val = 0; + *val2 = 500000; + break; + default: + return -EINVAL; + } + + return IIO_VAL_INT_PLUS_MICRO; +} + static int veml6030_read_thresh(struct iio_dev *indio_dev, int *val, int *val2, int dir) { @@ -559,7 +685,7 @@ static int veml6030_read_raw(struct iio_dev *indio_dev, return -EINVAL; case IIO_CHAN_INFO_SCALE: if (chan->type == IIO_LIGHT) - return veml6030_get_als_gain(indio_dev, val, val2); + return data->chip->get_als_gain(indio_dev, val, val2); return -EINVAL; default: return -EINVAL; @@ -571,6 +697,8 @@ static int veml6030_read_avail(struct iio_dev *indio_dev, const int **vals, int *type, int *length, long mask) { + struct veml6030_data *data = iio_priv(indio_dev); + switch (mask) { case IIO_CHAN_INFO_INT_TIME: *vals = (int *)&veml6030_it_times; @@ -578,8 +706,8 @@ static int veml6030_read_avail(struct iio_dev *indio_dev, *type = IIO_VAL_INT_PLUS_MICRO; return IIO_AVAIL_LIST; case IIO_CHAN_INFO_SCALE: - *vals = (int *)&veml6030_scale_vals; - *length = 2 * ARRAY_SIZE(veml6030_scale_vals); + *vals = (int *)*data->chip->scale_vals; + *length = 2 * data->chip->num_scale_vals; *type = IIO_VAL_INT_PLUS_MICRO; return IIO_AVAIL_LIST; default: @@ -591,6 +719,8 @@ static int veml6030_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { + struct veml6030_data *data = iio_priv(indio_dev); + switch (mask) { case IIO_CHAN_INFO_INT_TIME: switch (chan->type) { @@ -602,7 +732,7 @@ static int veml6030_write_raw(struct iio_dev *indio_dev, case IIO_CHAN_INFO_SCALE: switch (chan->type) { case IIO_LIGHT: - return veml6030_set_als_gain(indio_dev, val, val2); + return data->chip->set_als_gain(indio_dev, val, val2); default: return -EINVAL; } @@ -713,12 +843,28 @@ static const struct iio_info veml6030_info = { .event_attrs = &veml6030_event_attr_group, }; +static const struct iio_info veml6035_info = { + .read_raw = veml6030_read_raw, + .read_avail = veml6030_read_avail, + .write_raw = veml6030_write_raw, + .read_event_value = veml6030_read_event_val, + .write_event_value = veml6030_write_event_val, + .read_event_config = veml6030_read_interrupt_config, + .write_event_config = veml6030_write_interrupt_config, + .event_attrs = &veml6030_event_attr_group, +}; + static const struct iio_info veml6030_info_no_irq = { .read_raw = veml6030_read_raw, .read_avail = veml6030_read_avail, .write_raw = veml6030_write_raw, }; +static const struct iio_info veml6035_info_no_irq = { + .read_raw = veml6030_read_raw, + .write_raw = veml6030_write_raw, +}; + static irqreturn_t veml6030_event_handler(int irq, void *private) { int ret, reg, evtdir; @@ -803,6 +949,63 @@ static int veml6030_hw_init(struct iio_dev *indio_dev) return ret; } +/* + * Set ALS gain to 1/8, integration time to 100 ms, ALS and WHITE + * channel enabled, ALS channel interrupt, PSM enabled, + * PSM_WAIT = 0.8 s, persistence to 1 x integration time and the + * threshold interrupt disabled by default. First shutdown the sensor, + * update registers and then power on the sensor. + */ +static int veml6035_hw_init(struct iio_dev *indio_dev) +{ + int ret, val; + struct veml6030_data *data = iio_priv(indio_dev); + struct i2c_client *client = data->client; + + ret = veml6030_als_shut_down(data); + if (ret) + return dev_err_probe(&client->dev, ret, "can't shutdown als\n"); + + ret = regmap_write(data->regmap, VEML6030_REG_ALS_CONF, + VEML6035_SENS | VEML6035_CHAN_EN | VEML6030_ALS_SD); + if (ret) + return dev_err_probe(&client->dev, ret, + "can't setup als configs\n"); + + ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_PSM, + VEML6030_PSM | VEML6030_PSM_EN, 0x03); + if (ret) + return dev_err_probe(&client->dev, ret, + "can't setup default PSM\n"); + + ret = regmap_write(data->regmap, VEML6030_REG_ALS_WH, 0xFFFF); + if (ret) + return dev_err_probe(&client->dev, ret, + "can't setup high threshold\n"); + + ret = regmap_write(data->regmap, VEML6030_REG_ALS_WL, 0x0000); + if (ret) + return dev_err_probe(&client->dev, ret, + "can't setup low threshold\n"); + + ret = veml6030_als_pwr_on(data); + if (ret) + return dev_err_probe(&client->dev, ret, "can't poweron als\n"); + + /* Clear stale interrupt status bits if any during start */ + ret = regmap_read(data->regmap, VEML6030_REG_ALS_INT, &val); + if (ret < 0) + return dev_err_probe(&client->dev, ret, + "can't clear als interrupt status\n"); + + /* Cache currently active measurement parameters */ + data->cur_gain = 5; + data->cur_resolution = 1024; + data->cur_integration_time = 3; + + return 0; +} + static int veml6030_probe(struct i2c_client *client) { int ret; @@ -833,7 +1036,11 @@ static int veml6030_probe(struct i2c_client *client) return dev_err_probe(&client->dev, ret, "failed to enable regulator\n"); - indio_dev->name = "veml6030"; + data->chip = i2c_get_match_data(client); + if (!data->chip) + return -EINVAL; + + indio_dev->name = data->chip->name; indio_dev->channels = veml6030_channels; indio_dev->num_channels = ARRAY_SIZE(veml6030_channels); indio_dev->modes = INDIO_DIRECT_MODE; @@ -842,15 +1049,15 @@ static int veml6030_probe(struct i2c_client *client) ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, veml6030_event_handler, IRQF_TRIGGER_LOW | IRQF_ONESHOT, - "veml6030", indio_dev); + indio_dev->name, indio_dev); if (ret < 0) return dev_err_probe(&client->dev, ret, "irq %d request failed\n", client->irq); - indio_dev->info = &veml6030_info; + indio_dev->info = data->chip->info; } else { - indio_dev->info = &veml6030_info_no_irq; + indio_dev->info = data->chip->info_no_irq; } ret = devm_add_action_or_reset(&client->dev, @@ -858,7 +1065,7 @@ static int veml6030_probe(struct i2c_client *client) if (ret < 0) return ret; - ret = veml6030_hw_init(indio_dev); + ret = data->chip->hw_init(indio_dev); if (ret < 0) return ret; @@ -894,14 +1101,44 @@ static int veml6030_runtime_resume(struct device *dev) static DEFINE_RUNTIME_DEV_PM_OPS(veml6030_pm_ops, veml6030_runtime_suspend, veml6030_runtime_resume, NULL); +static const struct veml603x_chip veml6030_chip = { + .name = "veml6030", + .scale_vals = &veml6030_scale_vals, + .num_scale_vals = ARRAY_SIZE(veml6030_scale_vals), + .info = &veml6030_info, + .info_no_irq = &veml6030_info_no_irq, + .hw_init = veml6030_hw_init, + .set_als_gain = veml6030_set_als_gain, + .get_als_gain = veml6030_get_als_gain, +}; + +static const struct veml603x_chip veml6035_chip = { + .name = "veml6035", + .scale_vals = &veml6035_scale_vals, + .num_scale_vals = ARRAY_SIZE(veml6035_scale_vals), + .info = &veml6035_info, + .info_no_irq = &veml6035_info_no_irq, + .hw_init = veml6035_hw_init, + .set_als_gain = veml6035_set_als_gain, + .get_als_gain = veml6035_get_als_gain, +}; + static const struct of_device_id veml6030_of_match[] = { - { .compatible = "vishay,veml6030" }, + { + .compatible = "vishay,veml6030", + .data = &veml6030_chip, + }, + { + .compatible = "vishay,veml6035", + .data = &veml6035_chip, + }, { } }; MODULE_DEVICE_TABLE(of, veml6030_of_match); static const struct i2c_device_id veml6030_id[] = { - { "veml6030" }, + { "veml6030", (kernel_ulong_t)&veml6030_chip}, + { "veml6035", (kernel_ulong_t)&veml6035_chip}, { } }; MODULE_DEVICE_TABLE(i2c, veml6030_id);