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a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE Link: https://www.allegromicro.com/en/about-allegro Signed-off-by: Neil Armstrong Acked-by: Rob Herring (Arm) --- Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml index b320a39de7fe..2f5b67572ef4 100644 --- a/Documentation/devicetree/bindings/vendor-prefixes.yaml +++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml @@ -83,6 +83,8 @@ patternProperties: description: ALFA Network Inc. "^allegro,.*": description: Allegro DVT + "^allegromicro,.*": + description: Allegro MicroSystems, Inc. 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Mon, 07 Oct 2024 06:14:50 -0700 (PDT) From: Neil Armstrong Date: Mon, 07 Oct 2024 15:14:39 +0200 Subject: [PATCH 2/3] dt-bindings: iio: magnetometer: document the Allegro MicroSystems ALS31300 3-D Linear Hall Effect Sensor Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241007-topic-input-upstream-als31300-v1-2-2c240ea5cb77@linaro.org> References: <20241007-topic-input-upstream-als31300-v1-0-2c240ea5cb77@linaro.org> In-Reply-To: <20241007-topic-input-upstream-als31300-v1-0-2c240ea5cb77@linaro.org> To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Cameron , Lars-Peter Clausen Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, Neil Armstrong X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=2303; i=neil.armstrong@linaro.org; h=from:subject:message-id; bh=H4ObjvN0nM/3v8VDUiTn+mUQT+EEmB8rYxi9I1hNLKI=; b=owEBbQKS/ZANAwAKAXfc29rIyEnRAcsmYgBnA97GrFEAK0faKwe/Odebv7QR41u64zNeFM/acM8c VR7MX8iJAjMEAAEKAB0WIQQ9U8YmyFYF/h30LIt33NvayMhJ0QUCZwPexgAKCRB33NvayMhJ0WyZD/ oCEIijPad632p6K5xtEVKcUPUQ+fgFzIP4z3oP53WvrfA20NLlQACXZdFBGUNdXlj6BNcHsUR03KDL PHE3kHztM8as0MawBg8JK9V4yJKNVIQE+APaVNoK5+fDC03Ze8xeBl5BEMtzZAL6qilUz1kkb8jvWD diDsy1klcggqdEx6j9jBgC9ITeLL7NicDq3a0uaNalB9vuc2hUFYrTUyI8KZUxYkbSuIiBFHQTm1ZM cQbv2cHWtaaoB5R1nWtcZwSfDLhkqW7+UyXwMLdaqpynvQO59SlFTEjkwe0wlixutctzZZ0bz3YVTh gGhhpaRndnu4hyqGhaBS2FUpWMIBFXH7cJCd0sf0qe+R657i2HLjTOULxvYhrbIzBGnia69UB6lU5f nbyRHhAPLm15iUKKGnn9GdDMT4Av7K/5vbo3q78Rf0DYTh2aH7Wge1b731s6Vze0uTeVMsulR1OchV Rk18bdv/HNQfP4JlqYBUZrCMr0T4aKXuWs7FNw2iKvgEmpYXa7mmjRIgjmOpi1lOKuLuYT0MjEEHM9 8vf/3mLWjd3Y69u/DRsibrM/yEfe3b61KfWfOhPW2bktgcK2EkVFrMmtetfvkjUHz3JE6CNf6fd9N+ WG/SJU61AtDRRZ3wbnA5r/3mrOvbHxqWAPU652w4XGMj+CTACQauZSipidLg== X-Developer-Key: i=neil.armstrong@linaro.org; a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE Document the bindings for the Allegro MicroSystems ALS31300 3-D Linear Hall Effect Sensor controller by an I2C interface, mainly used in 3D head-on motion sensing applications. The device can be configured with different sensitivities in factory, but the sensitivity value used to calculate value into the Gauss unit is not available from registers, thus the sensitivity is provided by the compatible/device-id string which is based on the part number as described in the datasheet page 2. The datasheet is available on the product website at [1]. [1] https://www.allegromicro.com/en/products/sense/linear-and-angular-position/linear-position-sensor-ics/als31300 Signed-off-by: Neil Armstrong --- .../iio/magnetometer/allegro,als31300.yaml | 43 ++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/Documentation/devicetree/bindings/iio/magnetometer/allegro,als31300.yaml b/Documentation/devicetree/bindings/iio/magnetometer/allegro,als31300.yaml new file mode 100644 index 000000000000..0a08e769f3aa --- /dev/null +++ b/Documentation/devicetree/bindings/iio/magnetometer/allegro,als31300.yaml @@ -0,0 +1,43 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/magnetometer/allegromicro,als31300.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Allegro MicroSystems ALS31300 3-D Linear Hall Effect sensor + +maintainers: + - Neil Armstrong + +properties: + $nodename: + pattern: '^magnetometer@[0-9a-f]+$' + + compatible: + enum: + - allegromicro,als31300-500 # Factory configured at 500 Gauss input range + - allegromicro,als31300-1000 # Factory configured at 1000 Gauss input range + - allegromicro,als31300-2000 # Factory configured at 2000 Gauss input range + + reg: + maxItems: 1 + + vcc-supply: + description: 5.5V supply + +required: + - compatible + +additionalProperties: false + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + sensor@61 { + compatible = "allegromicro,als31300"; + reg = <0x61>; + vcc-supply = <&hall_vcc>; + }; + }; From patchwork Mon Oct 7 13:14:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Neil Armstrong X-Patchwork-Id: 13824665 Received: from mail-wm1-f52.google.com (mail-wm1-f52.google.com [209.85.128.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 83FF31D3644 for ; Mon, 7 Oct 2024 13:14:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.52 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728306895; cv=none; b=EqcAaxNZdFObz8b5le5/LMV9bIDXTW1ridasrBWFmLhxYBG4naUplpEW9ZWHZ25u5gmfye5PLaDk+mQVLrKBG2zEpJ/x2aqxnqWCeK6m9+vuQ1W2ju947/2gdJ+bA2EfzfNITJ5PSWhW3K5Ob+cFW4Hi1mdCB9H3wFpWbYhucW0= ARC-Message-Signature: i=1; a=rsa-sha256; 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Mon, 07 Oct 2024 06:14:51 -0700 (PDT) From: Neil Armstrong Date: Mon, 07 Oct 2024 15:14:40 +0200 Subject: [PATCH 3/3] iio: magnetometer: add Allegro MicroSystems ALS31300 3-D Linear Hall Effect driver Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241007-topic-input-upstream-als31300-v1-3-2c240ea5cb77@linaro.org> References: <20241007-topic-input-upstream-als31300-v1-0-2c240ea5cb77@linaro.org> In-Reply-To: <20241007-topic-input-upstream-als31300-v1-0-2c240ea5cb77@linaro.org> To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Cameron , Lars-Peter Clausen Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, Neil Armstrong X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=15979; i=neil.armstrong@linaro.org; h=from:subject:message-id; bh=JE9NM46xm6yUa5BAzvE76L+iWgUrQoHCcP0yblU388c=; b=owEBbQKS/ZANAwAKAXfc29rIyEnRAcsmYgBnA97HXjaosaOJPMPI1ESZnVrgAQ85u53QiofhPTQY Sty183aJAjMEAAEKAB0WIQQ9U8YmyFYF/h30LIt33NvayMhJ0QUCZwPexwAKCRB33NvayMhJ0Z6tD/ 9EXkZgx4cNH/5uz8c48SNITuvWDreqwF3wuhdIHAnrLLzM6Z4bSns0e2yDUZ5UinetS5ytJqDedi+F XSIgQNaBdgaZdG5xKJK/8F/nMgqV53Ur76zFWntaW6OzhWVNQvhlbkDnsTC4K/Z7naEXlTOA6jMXyF bRj7vqYvgRefVxx+wldINVh1WqdQS4f3WXFAZ14psei+0IeBRjlkvDHwSuTCejHioPFbHlXThoF1xd O5PiFhbVO9BGtRw7R9ykWfHy3eYY8wKnTBRRTV7SDvRc+PvACuEKKXLt4bY5F2+xF9ATgHI/4ONYRP hwsH7j+JhVd5seQwmHBdoss6oI0eVFkMon6sq3e4DKpjI3s6qnMm+LER3ApWytTjhNgzvv5uonOtbO vQZHRXuaa7fdK++MSIJ4bAuJn2CzwhbQtwHJhRl5JpCrIhBPwq3YpUUtYu1coCiFoqw4uSsz51pcbY ShFkIhBP3UOWS1FloGIpu6//lB102WBWIfpOUJ5/8e/Q9VgqgRVIJyNoh6IdYneCaJjVg4UZV7tKal Yb2HUxy5inBKnzAH0ACmJivygrF7ZxdsjEseIkNeqQtSZcXf/e6tgHWw15oqNye0fxh8pP11++9xib GRiDg21JNTeZICMlyRtNPP+OIg4PgEhhTWtSpMGIkXctPB7Xa9nRdarzs7bA== X-Developer-Key: i=neil.armstrong@linaro.org; a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE The Allegro MicroSystems ALS31300 is a 3-D Linear Hall Effect Sensor mainly used for 3D head-on motion sensing applications. The device is configured over I2C, and as part of the Sensor data the temperature core is also provided. While the device provides an IRQ gpio, it depends on a configuration programmed into the internal EEPROM, thus only the default mode is supported and buffered input via trigger is also supported to allow streaming values with the same sensing timestamp. The device can be configured with different sensitivities in factory, but the sensitivity value used to calculate value into the Gauss unit is not available from registers, thus the sensitivity is provided by the compatible/device-id string which is based on the part number as described in the datasheet page 2. Signed-off-by: Neil Armstrong --- drivers/iio/magnetometer/Kconfig | 13 + drivers/iio/magnetometer/Makefile | 1 + drivers/iio/magnetometer/als31300.c | 459 ++++++++++++++++++++++++++++++++++++ 3 files changed, 473 insertions(+) diff --git a/drivers/iio/magnetometer/Kconfig b/drivers/iio/magnetometer/Kconfig index 8eb718f5e50f..e7adc11049d6 100644 --- a/drivers/iio/magnetometer/Kconfig +++ b/drivers/iio/magnetometer/Kconfig @@ -52,6 +52,19 @@ config AK09911 help Deprecated: AK09911 is now supported by AK8975 driver. +config ALS31300 + tristate "Allegro MicroSystems ALS31300 3-D Linear Hall Effect Sensor" + depends on I2C + select REGMAP_I2C + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER + help + Say yes here to build support for the Allegro MicroSystems + ALS31300 Hall Effect Sensor through its I2C interface. + + To compile this driver as a module, choose M here: the + module will be called als31300. + config BMC150_MAGN tristate select IIO_BUFFER diff --git a/drivers/iio/magnetometer/Makefile b/drivers/iio/magnetometer/Makefile index ec5c46fbf999..3e4c2ecd9adf 100644 --- a/drivers/iio/magnetometer/Makefile +++ b/drivers/iio/magnetometer/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_AF8133J) += af8133j.o obj-$(CONFIG_AK8974) += ak8974.o obj-$(CONFIG_AK8975) += ak8975.o +obj-$(CONFIG_ALS31300) += als31300.o obj-$(CONFIG_BMC150_MAGN) += bmc150_magn.o obj-$(CONFIG_BMC150_MAGN_I2C) += bmc150_magn_i2c.o obj-$(CONFIG_BMC150_MAGN_SPI) += bmc150_magn_spi.o diff --git a/drivers/iio/magnetometer/als31300.c b/drivers/iio/magnetometer/als31300.c new file mode 100644 index 000000000000..123e6a63b516 --- /dev/null +++ b/drivers/iio/magnetometer/als31300.c @@ -0,0 +1,459 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for the Allegro MicroSystems ALS31300 3-D Linear Hall Effect Sensor + * + * Copyright (c) 2024 Linaro Limited + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +/* + * The Allegro MicroSystems ALS31300 has an EEPROM space to configure how + * the device works and how the interrupt line behaves, + * we only support the default setup with external trigger + * + * Since by default the interrupt line is disable, we don't + * support GPIO interrupt events for now. + * + * It should be possible to adapt the driver to the current + * device setup, but we leave it as a future exercise. + */ + +#define ALS31300_EEPROM_CONFIG 0x02 +#define ALS31300_EEPROM_INTERRUPT 0x03 +#define ALS31300_EEPROM_CUSTOMER_1 0x0d +#define ALS31300_EEPROM_CUSTOMER_2 0x0e +#define ALS31300_EEPROM_CUSTOMER_3 0x0f +#define ALS31300_VOLATILE_MODE 0x27 +#define ALS31300_VOLATILE_MODE_LPDCM GENMASK(6, 4) +#define ALS31300_VOLATILE_MODE_SLEEP GENMASK(1, 0) +#define ALS31300_VOLATILE_MSB 0x28 +#define ALS31300_VOLATILE_MSB_TEMPERATURE GENMASK(5, 0) +#define ALS31300_VOLATILE_MSB_INTERRUPT BIT(6) +#define ALS31300_VOLATILE_MSB_NEW_DATA BIT(7) +#define ALS31300_VOLATILE_MSB_Z_AXIS GENMASK(15, 8) +#define ALS31300_VOLATILE_MSB_Y_AXIS GENMASK(23, 16) +#define ALS31300_VOLATILE_MSB_X_AXIS GENMASK(31, 24) +#define ALS31300_VOLATILE_LSB 0x29 +#define ALS31300_VOLATILE_LSB_TEMPERATURE GENMASK(5, 0) +#define ALS31300_VOLATILE_LSB_HALL_STATUS GENMASK(7, 7) +#define ALS31300_VOLATILE_LSB_Z_AXIS GENMASK(11, 8) +#define ALS31300_VOLATILE_LSB_Y_AXIS GENMASK(15, 12) +#define ALS31300_VOLATILE_LSB_X_AXIS GENMASK(19, 16) +#define ALS31300_VOLATILE_LSB_INTERRUPT_WRITE BIT(20) +#define ALS31300_CUSTOMER_ACCESS 0x35 + +#define ALS31300_LPDCM_INACTIVE_0_5_MS 0 +#define ALS31300_LPDCM_INACTIVE_1_0_MS 1 +#define ALS31300_LPDCM_INACTIVE_5_0_MS 2 +#define ALS31300_LPDCM_INACTIVE_10_0_MS 3 +#define ALS31300_LPDCM_INACTIVE_50_0_MS 4 +#define ALS31300_LPDCM_INACTIVE_100_0_MS 5 +#define ALS31300_LPDCM_INACTIVE_500_0_MS 6 +#define ALS31300_LPDCM_INACTIVE_1000_0_MS 7 + +#define ALS31300_VOLATILE_MODE_ACTIVE_MODE 0 +#define ALS31300_VOLATILE_MODE_SLEEP_MODE 1 +#define ALS31300_VOLATILE_MODE_LPDCM_MODE 2 + +#define ALS31300_DATA_X_GET(__buf) \ + ((int)(s8)FIELD_GET(ALS31300_VOLATILE_MSB_X_AXIS, __buf[0]) << 4 | \ + FIELD_GET(ALS31300_VOLATILE_LSB_X_AXIS, __buf[1])) +#define ALS31300_DATA_Y_GET(__buf) \ + ((int)(s8)FIELD_GET(ALS31300_VOLATILE_MSB_Y_AXIS, __buf[0]) << 4 | \ + FIELD_GET(ALS31300_VOLATILE_LSB_Y_AXIS, __buf[1])) +#define ALS31300_DATA_Z_GET(__buf) \ + ((int)(s8)FIELD_GET(ALS31300_VOLATILE_MSB_Z_AXIS, __buf[0]) << 4 | \ + FIELD_GET(ALS31300_VOLATILE_LSB_Z_AXIS, __buf[1])) +#define ALS31300_TEMPERATURE_GET(__buf) \ + ((u32)(u8)FIELD_GET(ALS31300_VOLATILE_MSB_TEMPERATURE, __buf[0]) << 6 | \ + FIELD_GET(ALS31300_VOLATILE_LSB_TEMPERATURE, __buf[1])) + +enum als31300_channels { + TEMPERATURE = 0, + AXIS_X, + AXIS_Y, + AXIS_Z, +}; + +struct als31300_data { + struct device *dev; + /* protects power on/off the device and access HW */ + struct mutex mutex; + unsigned long sensitivity; + struct regmap *map; + struct { + u16 temperature; + s16 channels[3]; + s64 timestamp __aligned(8); + } scan; +}; + +/* The whole measure is split into 2x32bit registers, we need to read them both at once */ +static int als31300_get_measure(struct als31300_data *data, s16 *t, s16 *x, + s16 *y, s16 *z) +{ + unsigned int count = 0; + u32 buf[2]; + int ret; + + mutex_lock(&data->mutex); + ret = pm_runtime_resume_and_get(data->dev); + if (ret) + goto unlock; + + /* Max update rate it 2KHz, wait up to 1ms */ + while (count < 50) { + /* Read Data */ + ret = regmap_bulk_read(data->map, ALS31300_VOLATILE_MSB, buf, 2); + if (ret) { + dev_err(data->dev, "read data failed, error %d\n", ret); + goto out; + } + + /* Check if data is valid, happens right after getting out of sleep mode */ + if (FIELD_GET(ALS31300_VOLATILE_MSB_NEW_DATA, buf[0])) + break; + + usleep_range(10, 20); + ++count; + } + + if (count >= 50) { + ret = -ETIMEDOUT; + goto out; + } + + *t = ALS31300_TEMPERATURE_GET(buf); + *x = ALS31300_DATA_X_GET(buf); + *y = ALS31300_DATA_Y_GET(buf); + *z = ALS31300_DATA_Z_GET(buf); + +out: + pm_runtime_mark_last_busy(data->dev); + pm_runtime_put_autosuspend(data->dev); + +unlock: + mutex_unlock(&data->mutex); + + return ret; +} + +static int als31300_read_raw(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, int *val, + int *val2, long mask) +{ + struct als31300_data *data = iio_priv(indio_dev); + s16 t, x, y, z; + int ret; + + switch (mask) { + case IIO_CHAN_INFO_PROCESSED: + case IIO_CHAN_INFO_RAW: + ret = als31300_get_measure(data, &t, &x, &y, &z); + if (ret) + return ret; + switch (chan->address) { + case TEMPERATURE: + *val = t; + return IIO_VAL_INT; + case AXIS_X: + *val = x; + return IIO_VAL_INT; + case AXIS_Y: + *val = y; + return IIO_VAL_INT; + case AXIS_Z: + *val = z; + return IIO_VAL_INT; + default: + return -EINVAL; + } + case IIO_CHAN_INFO_SCALE: + switch (chan->type) { + case IIO_TEMP: + /* + * Fractional part of: + * 302(value - 1708) + * temp = ------------------ + * 4096 + * to convert temperature in Celcius + */ + *val = 302; + *val2 = 4096; + return IIO_VAL_FRACTIONAL; + case IIO_MAGN: + /* + * Devices are configured in factory + * with different sensitivities: + * - 500 GAUSS <-> 4 LSB/Gauss + * - 1000 GAUSS <-> 2 LSB/Gauss + * - 2000 GAUSS <-> 1 LSB/Gauss + * with translates by a division of the returned + * value to get Gauss value. + * The sensisitivity cannot be read at runtime + * so the value depends on the model compatible + * or device id. + */ + *val = 1; + *val2 = data->sensitivity; + return IIO_VAL_FRACTIONAL; + default: + return -EINVAL; + } + case IIO_CHAN_INFO_OFFSET: + switch (chan->type) { + case IIO_TEMP: + *val = -1708; + return IIO_VAL_INT; + default: + return -EINVAL; + } + + default: + return -EINVAL; + } +} + +static irqreturn_t als31300_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct als31300_data *data = iio_priv(indio_dev); + s16 x, y, z; + u16 t; + int ret; + + ret = als31300_get_measure(data, &t, &x, &y, &z); + if (ret) + goto trigger_out; + + data->scan.temperature = t; + data->scan.channels[0] = x; + data->scan.channels[1] = y; + data->scan.channels[2] = z; + iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, + iio_get_time_ns(indio_dev)); + +trigger_out: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +#define ALS31300_AXIS_CHANNEL(axis, index) \ + { \ + .type = IIO_MAGN, \ + .modified = 1, \ + .channel2 = IIO_MOD_##axis, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_SCALE), \ + .address = index, \ + .scan_index = index, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 12, \ + .storagebits = 16, \ + .endianness = IIO_CPU, \ + }, \ + } + +static const struct iio_chan_spec als31300_channels[] = { + { + .type = IIO_TEMP, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_OFFSET), + .address = TEMPERATURE, + .scan_index = TEMPERATURE, + .scan_type = { + .sign = 'u', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_CPU, + }, + }, + ALS31300_AXIS_CHANNEL(X, AXIS_X), + ALS31300_AXIS_CHANNEL(Y, AXIS_Y), + ALS31300_AXIS_CHANNEL(Z, AXIS_Z), + IIO_CHAN_SOFT_TIMESTAMP(6), +}; + +static const struct iio_info als31300_info = { + .read_raw = als31300_read_raw, +}; + +static int als31300_set_operating_mode(struct als31300_data *data, + unsigned int val) +{ + return regmap_update_bits(data->map, ALS31300_VOLATILE_MODE, + ALS31300_VOLATILE_MODE_SLEEP, val); +} + +static void als31300_power_down(void *data) +{ + als31300_set_operating_mode(data, ALS31300_VOLATILE_MODE_SLEEP_MODE); +} + +static const struct iio_buffer_setup_ops als31300_setup_ops = {}; + +static const unsigned long als31300_scan_masks[] = { GENMASK(3, 0), 0 }; + +static bool als31300_volatile_reg(struct device *dev, unsigned int reg) +{ + return reg == ALS31300_VOLATILE_MSB || reg == ALS31300_VOLATILE_LSB; +} + +static const struct regmap_config als31300_regmap_config = { + .reg_bits = 8, + .val_bits = 32, + .max_register = ALS31300_CUSTOMER_ACCESS, + .volatile_reg = als31300_volatile_reg, +}; + +static int als31300_probe(struct i2c_client *i2c) +{ + struct device *dev = &i2c->dev; + struct als31300_data *data; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + data->dev = dev; + i2c_set_clientdata(i2c, indio_dev); + + mutex_init(&data->mutex); + + data->sensitivity = (unsigned long)of_device_get_match_data(dev); + + data->map = devm_regmap_init_i2c(i2c, &als31300_regmap_config); + if (IS_ERR(data->map)) + return dev_err_probe(dev, PTR_ERR(data->map), + "failed to allocate register map\n"); + + ret = devm_regulator_get_enable(dev, "vcc"); + if (ret) + return dev_err_probe(dev, ret, "failed to enable regulator\n"); + + ret = als31300_set_operating_mode(data, ALS31300_VOLATILE_MODE_ACTIVE_MODE); + if (ret) + return dev_err_probe(dev, ret, "failed to power on device\n"); + + ret = devm_add_action_or_reset(dev, als31300_power_down, data); + if (ret) + return dev_err_probe(dev, ret, "failed to add powerdown action\n"); + + indio_dev->info = &als31300_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->name = i2c->name; + indio_dev->channels = als31300_channels; + indio_dev->num_channels = ARRAY_SIZE(als31300_channels); + indio_dev->available_scan_masks = als31300_scan_masks; + + ret = devm_iio_triggered_buffer_setup(dev, indio_dev, + iio_pollfunc_store_time, + als31300_trigger_handler, + &als31300_setup_ops); + if (ret < 0) { + dev_err(dev, "iio triggered buffer setup failed\n"); + return ret; + } + + ret = pm_runtime_set_active(dev); + if (ret < 0) + return ret; + + ret = devm_pm_runtime_enable(dev); + if (ret) + return ret; + + pm_runtime_get_noresume(dev); + pm_runtime_set_autosuspend_delay(dev, 200); + pm_runtime_use_autosuspend(dev); + + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); + + ret = devm_iio_device_register(dev, indio_dev); + if (ret) + return dev_err_probe(dev, ret, "device register failed\n"); + + return 0; +} + +static int als31300_runtime_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct als31300_data *data = iio_priv(indio_dev); + int ret; + + ret = als31300_set_operating_mode(data, ALS31300_VOLATILE_MODE_SLEEP_MODE); + if (ret) + dev_err(dev, "failed to power off device (%pe)\n", ERR_PTR(ret)); + + return ret; +} + +static int als31300_runtime_resume(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct als31300_data *data = iio_priv(indio_dev); + int ret; + + ret = als31300_set_operating_mode(data, ALS31300_VOLATILE_MODE_ACTIVE_MODE); + if (ret) + dev_err(dev, "failed to power on device (%pe)\n", ERR_PTR(ret)); + + return ret; +} + +static DEFINE_RUNTIME_DEV_PM_OPS(als31300_pm_ops, + als31300_runtime_suspend, als31300_runtime_resume, + NULL); + +static const struct i2c_device_id als31300_id[] = { + { "als31300-500" }, + { "als31300-1000" }, + { "als31300-2000" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(i2c, als31300_id); + +static const struct of_device_id als31300_of_match[] = { + { .compatible = "allegromicro,als31300-500", .data = (void *)4 }, + { .compatible = "allegromicro,als31300-1000", .data = (void *)2 }, + { .compatible = "allegromicro,als31300-2000", .data = (void *)1 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, als31300_of_match); + +static struct i2c_driver als31300_driver = { + .driver = { + .name = "als31300", + .of_match_table = als31300_of_match, + .pm = pm_ptr(&als31300_pm_ops), + }, + .probe = als31300_probe, + .id_table = als31300_id, +}; +module_i2c_driver(als31300_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("ALS31300 3-D Linear Hall Effect Driver"); +MODULE_AUTHOR("Neil Armstrong ");