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[87.92.212.6]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5b8a04600a2sm1689154e87.36.2026.09.13.03.48.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 13 Sep 2026 03:48:07 -0700 (PDT) From: Md Shofiqul Islam To: Jonathan Cameron Cc: jic23@kernel.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, andriy.shevchenko@intel.com, u.kleine-koenig@baylibre.com, joshua.crofts1@gmail.com, nuno.sa@analog.com, Michael.Hennerich@analog.com, dlechner@baylibre.com, linux@analog.com, linux-kernel@vger.kernel.org, Md Shofiqul Islam Subject: [PATCH v11 1/2] dt-bindings: iio: health: add adi,max86150 Date: Sun, 13 Sep 2026 13:46:55 +0300 Message-ID: <20260913104658.230422-2-shofiqtest@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260913104658.230422-1-shofiqtest@gmail.com> References: <20260913104658.230422-1-shofiqtest@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add the Device Tree binding schema for the Analog Devices MAX86150 integrated biosensor, which combines two photoplethysmography (PPG) channels (Red LED and IR LED) and one electrocardiogram (ECG) channel in a single I2C device. The device requires four independent supply rails per the datasheet power tree: digital core (vdd), analog core (avdd), ECG reference (vref), and LED anode (leds). Assisted-by: Claude:claude-sonnet-5 Signed-off-by: Md Shofiqul Islam Reviewed-by: Rob Herring (Arm) --- .../bindings/iio/health/adi,max86150.yaml | 77 +++++++++++++++++++ MAINTAINERS | 6 ++ 2 files changed, 83 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/health/adi,max861= 50.yaml diff --git a/Documentation/devicetree/bindings/iio/health/adi,max86150.yaml= b/Documentation/devicetree/bindings/iio/health/adi,max86150.yaml new file mode 100644 index 000000000000..8392d08edd1b --- /dev/null +++ b/Documentation/devicetree/bindings/iio/health/adi,max86150.yaml @@ -0,0 +1,77 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/health/adi,max86150.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices MAX86150 ECG and PPG Biosensor + +maintainers: + - Md Shofiqul Islam + +description: | + The MAX86150 is an integrated biosensor SoC that combines: + - Two PPG (photoplethysmography) channels: Red LED and IR LED, + for heart rate and blood-oxygen saturation (SpO2) measurement. + - One ECG (electrocardiogram) channel for biopotential recording. + + The device communicates over I2C at up to 400 kHz. + + Datasheet: + https://www.analog.com/media/en/technical-documentation/data-sheets/MA= X86150.pdf + +properties: + compatible: + const: adi,max86150 + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + description: + Active-low interrupt line, asserted when the 32-entry hardware + FIFO reaches its configurable almost-full threshold, or when a + new PPG sample is ready. + + vdd-supply: + description: Digital core power supply (1.8 V). + + avdd-supply: + description: Analog core power supply (1.8 V). + + vref-supply: + description: ECG reference voltage supply. + + leds-supply: + description: LED anode supply, typically 3.3 V. + +required: + - compatible + - reg + - vdd-supply + - avdd-supply + - vref-supply + - leds-supply + +additionalProperties: false + +examples: + - | + #include + + i2c { + #address-cells =3D <1>; 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[87.92.212.6]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5b8a04600a2sm1689154e87.36.2026.09.13.03.48.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 13 Sep 2026 03:48:10 -0700 (PDT) From: Md Shofiqul Islam To: Jonathan Cameron Cc: jic23@kernel.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, andriy.shevchenko@intel.com, u.kleine-koenig@baylibre.com, joshua.crofts1@gmail.com, nuno.sa@analog.com, Michael.Hennerich@analog.com, dlechner@baylibre.com, linux@analog.com, linux-kernel@vger.kernel.org, Md Shofiqul Islam Subject: [PATCH v11 2/2] iio: health: add MAX86150 ECG and PPG biosensor driver Date: Sun, 13 Sep 2026 13:46:56 +0300 Message-ID: <20260913104658.230422-3-shofiqtest@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260913104658.230422-1-shofiqtest@gmail.com> References: <20260913104658.230422-1-shofiqtest@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Add a new IIO driver for the Analog Devices MAX86150 integrated biosensor, which combines two PPG optical channels (Red/IR LED) and one ECG biopotential channel behind a 32-entry hardware FIFO in a single I2C device. The driver registers a kfifo buffer directly, matching max30102.c in this directory, rather than using the trigger framework: enabling the buffer powers the chip up and arms the FIFO almost-full interrupt, and a single threaded IRQ handler drains the FIFO and pushes samples straight to the buffer. A part-ID check on probe rejects mismatched hardware before chip_init() writes any configuration blind. Suggested-by: Jonathan Cameron Suggested-by: Joshua Crofts Assisted-by: Claude:claude-sonnet-5 Signed-off-by: Md Shofiqul Islam --- MAINTAINERS | 1 + drivers/iio/health/Kconfig | 13 + drivers/iio/health/Makefile | 1 + drivers/iio/health/max86150.c | 658 ++++++++++++++++++++++++++++++++++ 4 files changed, 673 insertions(+) create mode 100644 drivers/iio/health/max86150.c diff --git a/MAINTAINERS b/MAINTAINERS index 189385966de8..5e266c03bda6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -15710,6 +15710,7 @@ M: Md Shofiqul Islam L: linux-iio@vger.kernel.org S: Maintained F: Documentation/devicetree/bindings/iio/health/adi,max86150.yaml +F: drivers/iio/health/max86150.c =20 MAX9286 QUAD GMSL DESERIALIZER DRIVER M: Jacopo Mondi diff --git a/drivers/iio/health/Kconfig b/drivers/iio/health/Kconfig index a89f3abf11f4..3b03744d9a5f 100644 --- a/drivers/iio/health/Kconfig +++ b/drivers/iio/health/Kconfig @@ -62,4 +62,17 @@ config MAX30102 =20 endmenu =20 +config MAX86150 + tristate "MAX86150 ECG and PPG biosensor" + depends on I2C + select IIO_BUFFER + select IIO_KFIFO_BUF + select REGMAP_I2C + help + Say Y here to enable support for the Maxim MAX86150 combined + ECG and photoplethysmography (PPG) biosensor. + + This driver can also be built as a module. If so, the module + will be called max86150. + endmenu diff --git a/drivers/iio/health/Makefile b/drivers/iio/health/Makefile index 910817112258..04fc73c58444 100644 --- a/drivers/iio/health/Makefile +++ b/drivers/iio/health/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_AFE4403) +=3D afe4403.o obj-$(CONFIG_AFE4404) +=3D afe4404.o obj-$(CONFIG_MAX30100) +=3D max30100.o obj-$(CONFIG_MAX30102) +=3D max30102.o +obj-$(CONFIG_MAX86150) +=3D max86150.o diff --git a/drivers/iio/health/max86150.c b/drivers/iio/health/max86150.c new file mode 100644 index 000000000000..9829edaed32b --- /dev/null +++ b/drivers/iio/health/max86150.c @@ -0,0 +1,658 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MAX86150 combined ECG and PPG biosensor driver + * + * Copyright (C) 2026 Md Shofiqul Islam + * + * The MAX86150 integrates two PPG optical channels (Red/IR LED) and one + * ECG biopotential channel in a single I2C device. Data is captured + * through a 32-entry hardware FIFO with a configurable almost-full + * interrupt, making it well-suited for continuous monitoring with a + * low-power host. + * + * Datasheet: + * https://www.analog.com/media/en/technical-documentation/data-sheets/M= AX86150.pdf + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#define MAX86150_REG_INT_STATUS1 0x00 +#define MAX86150_REG_INT_STATUS2 0x01 +#define MAX86150_REG_INT_ENABLE1 0x02 +#define MAX86150_REG_INT_ENABLE2 0x03 +#define MAX86150_REG_FIFO_WR_PTR 0x04 +#define MAX86150_REG_OVF_COUNTER 0x05 +#define MAX86150_REG_FIFO_RD_PTR 0x06 +#define MAX86150_REG_FIFO_DATA 0x07 +#define MAX86150_REG_FIFO_CONFIG 0x08 +#define MAX86150_REG_FIFO_DCTRL1 0x09 +#define MAX86150_REG_FIFO_DCTRL2 0x0A +#define MAX86150_REG_SYS_CTRL 0x0D +#define MAX86150_REG_PPG_CONFIG1 0x10 +#define MAX86150_REG_PPG_CONFIG2 0x11 +#define MAX86150_REG_LED1_PA 0x14 +#define MAX86150_REG_LED2_PA 0x15 +#define MAX86150_REG_ECG_CONFIG1 0x3C +#define MAX86150_REG_ECG_CONFIG3 0x3E +#define MAX86150_REG_PART_ID 0xFF + +#define MAX86150_PART_ID_VAL 0x1E + +#define MAX86150_INT_A_FULL BIT(7) +#define MAX86150_INT_PPG_RDY BIT(6) + +#define MAX86150_SYS_SHDN BIT(1) +#define MAX86150_SYS_RESET BIT(0) + +#define MAX86150_FIFO_SMP_AVE GENMASK(7, 5) +#define MAX86150_FIFO_ROLLOVER_EN BIT(4) +#define MAX86150_FIFO_A_FULL GENMASK(3, 0) + +#define MAX86150_FD_NONE 0x0 +#define MAX86150_FD_LED1 0x1 +#define MAX86150_FD_LED2 0x2 +#define MAX86150_FD_ECG 0x9 +#define MAX86150_FIFO_FD1 GENMASK(3, 0) +#define MAX86150_FIFO_FD2 GENMASK(7, 4) +#define MAX86150_FIFO_FD3 GENMASK(3, 0) +#define MAX86150_FIFO_FD4 GENMASK(7, 4) + +#define MAX86150_PPG_ADC_RGE GENMASK(7, 6) +#define MAX86150_PPG_SR GENMASK(5, 1) + +/* PPG ADC full-scale range (ADC_RGE field of PPG_CONFIG1) */ +#define MAX86150_PPG_ADC_RGE_4096_NA 0 +#define MAX86150_PPG_ADC_RGE_8192_NA 1 +#define MAX86150_PPG_ADC_RGE_16384_NA 2 +#define MAX86150_PPG_ADC_RGE_32768_NA 3 + +/* PPG sample rate (SR field of PPG_CONFIG1) - single-pulse variants */ +#define MAX86150_PPG_SR_SP_10_HZ 0 +#define MAX86150_PPG_SR_SP_20_HZ 1 +#define MAX86150_PPG_SR_SP_50_HZ 2 +#define MAX86150_PPG_SR_SP_84_HZ 3 +#define MAX86150_PPG_SR_SP_100_HZ 4 +#define MAX86150_PPG_SR_SP_200_HZ 5 +#define MAX86150_PPG_SR_SP_400_HZ 6 +#define MAX86150_PPG_SR_SP_800_HZ 7 +#define MAX86150_PPG_SR_SP_1000_HZ 8 +#define MAX86150_PPG_SR_SP_1600_HZ 9 +#define MAX86150_PPG_SR_SP_3200_HZ 10 +/* Double-pulse variants (two LED pulses averaged per sample) */ +#define MAX86150_PPG_SR_DP_10_HZ 11 +#define MAX86150_PPG_SR_DP_20_HZ 12 +#define MAX86150_PPG_SR_DP_50_HZ 13 +#define MAX86150_PPG_SR_DP_84_HZ 14 +#define MAX86150_PPG_SR_DP_100_HZ 15 +#define MAX86150_PPG_SR_DP_200_HZ 16 +#define MAX86150_PPG_SR_DP_400_HZ 17 +#define MAX86150_PPG_SR_DP_800_HZ 18 +#define MAX86150_PPG_SR_DP_1000_HZ 19 +#define MAX86150_PPG_SR_DP_1600_HZ 20 +#define MAX86150_PPG_SR_DP_3200_HZ 21 + +#define MAX86150_FIFO_DEPTH 32 +#define MAX86150_BYTES_PER_SLOT 3 +#define MAX86150_NUM_SLOTS 3 +#define MAX86150_SAMPLE_BYTES (MAX86150_NUM_SLOTS * MAX86150_BYTES_PER_SL= OT) + +/* Samples available in the FIFO when the A_FULL interrupt fires */ +#define MAX86150_FIFO_A_FULL_SAMPLES 17 + +/* LED pulse amplitude: 0x00 =3D 0 mA, step ~0.8 mA, 0x3F ~=3D 50 mA, 0xFF= ~=3D 200 mA */ +#define MAX86150_LED_PA_DEFAULT 0x3F + +enum max86150_scan_idx { + MAX86150_IDX_PPG_RED, + MAX86150_IDX_PPG_IR, + MAX86150_IDX_ECG, + MAX86150_IDX_TS, +}; + +/** + * struct max86150_data - driver private state + * @regmap: register map for this device + * @sample_period_ns: sample period in nanoseconds (set from configured ra= te) + * @fifo_raw: scratch buffer for regmap_noinc_read() FIFO bursts; = kept + * in struct (heap) rather than on the stack, since sta= ck + * memory isn't guaranteed DMA-safe (e.g. CONFIG_VMAP_S= TACK) + * and some I2C host controllers DMA the read buffer + * @scan: IIO push buffer; channels[] packed per active_scan_m= ask + */ +struct max86150_data { + struct regmap *regmap; + u32 sample_period_ns; + u8 fifo_raw[MAX86150_SAMPLE_BYTES]; + IIO_DECLARE_DMA_BUFFER_WITH_TS(s32, scan, MAX86150_NUM_SLOTS); +}; + +static const struct iio_chan_spec max86150_channels[] =3D { + { + .type =3D IIO_INTENSITY, + .modified =3D 1, + .channel2 =3D IIO_MOD_LIGHT_RED, + .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW), + .scan_index =3D MAX86150_IDX_PPG_RED, + .scan_type =3D { + .sign =3D 'u', + .realbits =3D 19, + .storagebits =3D 32, + .endianness =3D IIO_CPU, + }, + }, + { + .type =3D IIO_INTENSITY, + .modified =3D 1, + .channel2 =3D IIO_MOD_LIGHT_IR, + .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW), + .scan_index =3D MAX86150_IDX_PPG_IR, + .scan_type =3D { + .sign =3D 'u', + .realbits =3D 19, + .storagebits =3D 32, + .endianness =3D IIO_CPU, + }, + }, + { + .type =3D IIO_VOLTAGE, + .channel =3D 0, + .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW), + .scan_index =3D MAX86150_IDX_ECG, + .scan_type =3D { + .sign =3D 's', + .realbits =3D 18, + .storagebits =3D 32, + .endianness =3D IIO_CPU, + }, + }, + IIO_CHAN_SOFT_TIMESTAMP(MAX86150_IDX_TS), +}; + +static bool max86150_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case MAX86150_REG_INT_STATUS1: + case MAX86150_REG_INT_STATUS2: + case MAX86150_REG_FIFO_WR_PTR: + case MAX86150_REG_OVF_COUNTER: + case MAX86150_REG_FIFO_RD_PTR: + case MAX86150_REG_FIFO_DATA: + return true; + default: + return false; + } +} + +static const struct regmap_config max86150_regmap_config =3D { + .reg_bits =3D 8, + .val_bits =3D 8, + .max_register =3D MAX86150_REG_PART_ID, + .volatile_reg =3D max86150_volatile_reg, + .cache_type =3D REGCACHE_RBTREE, +}; + +static int max86150_read_one_sample(struct max86150_data *data, + u32 *ppg_red, u32 *ppg_ir, s32 *ecg) +{ + int ret; + + ret =3D regmap_noinc_read(data->regmap, MAX86150_REG_FIFO_DATA, + data->fifo_raw, MAX86150_SAMPLE_BYTES); + if (ret) + return ret; + + *ppg_red =3D get_unaligned_be24(&data->fifo_raw[0]) & GENMASK(18, 0); + *ppg_ir =3D get_unaligned_be24(&data->fifo_raw[3]) & GENMASK(18, 0); + *ecg =3D sign_extend32(get_unaligned_be24(&data->fifo_raw[6]) & GENMASK(1= 7, 0), 17); + return 0; +} + +/* Does the actual work for max86150_do_read_raw(); see that function for = the shutdown wrapping. */ +static int max86150_read_raw_locked(struct max86150_data *data, + u32 *ppg_red, u32 *ppg_ir, s32 *ecg) +{ + unsigned int ppg_rdy_status; + int ret; + + ret =3D regmap_clear_bits(data->regmap, MAX86150_REG_SYS_CTRL, + MAX86150_SYS_SHDN); + if (ret) + return ret; + + ret =3D regmap_write(data->regmap, MAX86150_REG_FIFO_WR_PTR, 0); + if (ret) + return ret; + + ret =3D regmap_write(data->regmap, MAX86150_REG_OVF_COUNTER, 0); + if (ret) + return ret; + + ret =3D regmap_write(data->regmap, MAX86150_REG_FIFO_RD_PTR, 0); + if (ret) + return ret; + + /* + * Clear stale PPG_RDY from a previous session; reading + * INT_STATUS1 de-asserts any pending flags so the poll + * below waits for a genuinely new sample. + */ + ret =3D regmap_read(data->regmap, MAX86150_REG_INT_STATUS1, + &ppg_rdy_status); + if (ret) + return ret; + + /* + * Poll PPG_RDY rather than sleeping a fixed interval =E2=80=94 the + * internal oscillator may start slower than nominal. 25 ms + * covers more than two 100 Hz sample periods. + */ + ret =3D regmap_read_poll_timeout(data->regmap, + MAX86150_REG_INT_STATUS1, + ppg_rdy_status, + ppg_rdy_status & MAX86150_INT_PPG_RDY, + USEC_PER_MSEC, 25 * USEC_PER_MSEC); + if (ret) + return ret; + + return max86150_read_one_sample(data, ppg_red, ppg_ir, ecg); +} + +/* + * Take the device out of shutdown, reset the FIFO pointers, wait for the + * first PPG sample, and read it back. Always returns the device to + * shutdown before returning, whether or not the read succeeded. + */ +static int max86150_do_read_raw(struct max86150_data *data, + u32 *ppg_red, u32 *ppg_ir, s32 *ecg) +{ + int ret; + + ret =3D max86150_read_raw_locked(data, ppg_red, ppg_ir, ecg); + regmap_set_bits(data->regmap, MAX86150_REG_SYS_CTRL, MAX86150_SYS_SHDN); + return ret; +} + +static int max86150_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct max86150_data *data =3D iio_priv(indio_dev); + u32 ppg_red, ppg_ir; + s32 ecg; + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: { + IIO_DEV_ACQUIRE_DIRECT_MODE(indio_dev, claim); + + if (IIO_DEV_ACQUIRE_FAILED(claim)) + return -EBUSY; + + ret =3D max86150_do_read_raw(data, &ppg_red, &ppg_ir, &ecg); + if (ret) + return ret; + + switch (chan->scan_index) { + case MAX86150_IDX_PPG_RED: + *val =3D ppg_red; + return IIO_VAL_INT; + case MAX86150_IDX_PPG_IR: + *val =3D ppg_ir; + return IIO_VAL_INT; + case MAX86150_IDX_ECG: + *val =3D ecg; + return IIO_VAL_INT; + default: + return -EINVAL; + } + } + default: + return -EINVAL; + } +} + +static const struct iio_info max86150_iio_info =3D { + .read_raw =3D max86150_read_raw, +}; + +static int max86150_buffer_predisable(struct iio_dev *indio_dev) +{ + struct max86150_data *data =3D iio_priv(indio_dev); + int ret; + + ret =3D regmap_write(data->regmap, MAX86150_REG_INT_ENABLE1, 0); + if (ret) + return ret; + + return regmap_set_bits(data->regmap, MAX86150_REG_SYS_CTRL, + MAX86150_SYS_SHDN); +} + +static int max86150_buffer_postenable(struct iio_dev *indio_dev) +{ + struct max86150_data *data =3D iio_priv(indio_dev); + unsigned int dummy; + int ret; + + ret =3D regmap_clear_bits(data->regmap, MAX86150_REG_SYS_CTRL, + MAX86150_SYS_SHDN); + if (ret) + return ret; + + ret =3D regmap_write(data->regmap, MAX86150_REG_FIFO_WR_PTR, 0); + if (ret) + goto err_shdn; + + ret =3D regmap_write(data->regmap, MAX86150_REG_OVF_COUNTER, 0); + if (ret) + goto err_shdn; + + ret =3D regmap_write(data->regmap, MAX86150_REG_FIFO_RD_PTR, 0); + if (ret) + goto err_shdn; + + /* + * Clear a stale A_FULL latched from before the buffer was enabled; + * otherwise arming INT_ENABLE1 below fires the handler immediately + * against a FIFO state that was never actually seen as full. + */ + ret =3D regmap_read(data->regmap, MAX86150_REG_INT_STATUS1, &dummy); + if (ret) + goto err_shdn; + + ret =3D regmap_write(data->regmap, MAX86150_REG_INT_ENABLE1, + MAX86150_INT_A_FULL); + if (ret) + goto err_shdn; + return 0; + +err_shdn: + regmap_set_bits(data->regmap, MAX86150_REG_SYS_CTRL, MAX86150_SYS_SHDN); + return ret; +} + +static const struct iio_buffer_setup_ops max86150_buffer_setup_ops =3D { + .postenable =3D max86150_buffer_postenable, + .predisable =3D max86150_buffer_predisable, +}; + +/* + * Threaded IRQ handler (primary=3DNULL): clears INT_STATUS1 to de-assert = the + * line, then drains every sample currently in the FIFO and pushes each one + * straight to the buffer. No trigger indirection -- enabling/disabling t= he + * buffer is what arms/disarms the interrupt, via + * max86150_buffer_postenable()/_predisable() above. Matches the direct + * kfifo pattern max30102.c uses in this same directory. + */ +static irqreturn_t max86150_irq_handler(int irq, void *private) +{ + struct iio_dev *indio_dev =3D private; + struct max86150_data *data; + s64 irq_time; + unsigned int status, wr_ptr, rd_ptr, ovf, n_avail; + u32 ppg_red, ppg_ir; + s32 ecg; + int ret; + + data =3D iio_priv(indio_dev); + irq_time =3D iio_get_time_ns(indio_dev); + + ret =3D regmap_read(data->regmap, MAX86150_REG_INT_STATUS1, &status); + if (ret || !(status & MAX86150_INT_A_FULL)) + return IRQ_NONE; + + ret =3D regmap_read(data->regmap, MAX86150_REG_FIFO_WR_PTR, &wr_ptr); + if (ret) + return IRQ_HANDLED; + ret =3D regmap_read(data->regmap, MAX86150_REG_FIFO_RD_PTR, &rd_ptr); + if (ret) + return IRQ_HANDLED; + ret =3D regmap_read(data->regmap, MAX86150_REG_OVF_COUNTER, &ovf); + if (ret) + return IRQ_HANDLED; + + if (ovf > 0) { + n_avail =3D MAX86150_FIFO_DEPTH; + } else { + n_avail =3D (wr_ptr - rd_ptr) & (MAX86150_FIFO_DEPTH - 1); + /* + * wr_ptr =3D=3D rd_ptr with no overflow means either empty or + * exactly 32 slots filled (pointer wrapped). Since this + * handler only runs when A_FULL fired, the FIFO must be + * full =E2=80=94 treat as 32 available. + */ + if (n_avail =3D=3D 0) + n_avail =3D MAX86150_FIFO_DEPTH; + } + + for (unsigned int i =3D 0; i < n_avail; i++) { + unsigned int j; + s64 ts; + + if (ovf > 0) + ts =3D irq_time - + (s64)(n_avail - 1 - i) * data->sample_period_ns; + else + ts =3D irq_time + + ((s64)i - (MAX86150_FIFO_A_FULL_SAMPLES - 1)) * + data->sample_period_ns; + + ret =3D max86150_read_one_sample(data, &ppg_red, &ppg_ir, &ecg); + if (ret) + break; + + memset(data->scan, 0, sizeof(data->scan)); + j =3D 0; + + if (test_bit(MAX86150_IDX_PPG_RED, indio_dev->active_scan_mask)) + data->scan[j++] =3D ppg_red; + if (test_bit(MAX86150_IDX_PPG_IR, indio_dev->active_scan_mask)) + data->scan[j++] =3D ppg_ir; + if (test_bit(MAX86150_IDX_ECG, indio_dev->active_scan_mask)) + data->scan[j++] =3D ecg; + + iio_push_to_buffers_with_timestamp(indio_dev, data->scan, ts); + } + + return IRQ_HANDLED; +} + +/* + * This is a devm_add_action_or_reset() callback, so it can't return an + * error like the rest of this driver does -- dev_warn() is the only way + * left to surface a failed cleanup write here. + */ +static void max86150_powerdown(void *arg) +{ + struct max86150_data *data =3D arg; + struct device *dev =3D regmap_get_device(data->regmap); + int ret; + + ret =3D regmap_write(data->regmap, MAX86150_REG_INT_ENABLE1, 0); + if (ret) + dev_warn(dev, "Failed to disable interrupts: %d\n", ret); + + ret =3D regmap_set_bits(data->regmap, MAX86150_REG_SYS_CTRL, + MAX86150_SYS_SHDN); + if (ret) + dev_warn(dev, "Failed to shut down device: %d\n", ret); +} + +static int max86150_chip_init(struct max86150_data *data) +{ + int ret; + + ret =3D regmap_write(data->regmap, MAX86150_REG_SYS_CTRL, + MAX86150_SYS_RESET); + if (ret) + return ret; + + /* SYS_RESET self-clears within 1 ms (datasheet SYS_CTRL register) */ + fsleep(10 * USEC_PER_MSEC); + + /* + * FIFO_A_FULL holds (FIFO depth - samples available), i.e. how many + * free slots remain when the interrupt should fire. + */ + ret =3D regmap_write(data->regmap, MAX86150_REG_FIFO_CONFIG, + MAX86150_FIFO_ROLLOVER_EN | + FIELD_PREP_CONST(MAX86150_FIFO_A_FULL, + MAX86150_FIFO_DEPTH - + MAX86150_FIFO_A_FULL_SAMPLES)); + if (ret) + return ret; + + ret =3D regmap_write(data->regmap, MAX86150_REG_FIFO_DCTRL1, + FIELD_PREP_CONST(MAX86150_FIFO_FD1, MAX86150_FD_LED1) | + FIELD_PREP_CONST(MAX86150_FIFO_FD2, MAX86150_FD_LED2)); + if (ret) + return ret; + + ret =3D regmap_write(data->regmap, MAX86150_REG_FIFO_DCTRL2, + FIELD_PREP_CONST(MAX86150_FIFO_FD3, MAX86150_FD_ECG) | + FIELD_PREP_CONST(MAX86150_FIFO_FD4, MAX86150_FD_NONE)); + if (ret) + return ret; + + ret =3D regmap_write(data->regmap, MAX86150_REG_PPG_CONFIG1, + FIELD_PREP_CONST(MAX86150_PPG_ADC_RGE, + MAX86150_PPG_ADC_RGE_16384_NA) | + FIELD_PREP_CONST(MAX86150_PPG_SR, + MAX86150_PPG_SR_SP_100_HZ)); + if (ret) + return ret; + + /* matches MAX86150_PPG_SR_SP_100_HZ above */ + data->sample_period_ns =3D NSEC_PER_SEC / 100; + + ret =3D regmap_write(data->regmap, MAX86150_REG_LED1_PA, + MAX86150_LED_PA_DEFAULT); + if (ret) + return ret; + + ret =3D regmap_write(data->regmap, MAX86150_REG_LED2_PA, + MAX86150_LED_PA_DEFAULT); + if (ret) + return ret; + + return regmap_write(data->regmap, MAX86150_REG_SYS_CTRL, + MAX86150_SYS_SHDN); +} + +static const char * const max86150_supply_names[] =3D { + "vdd", "avdd", "vref", "leds", +}; + +static int max86150_probe(struct i2c_client *client) +{ + struct device *dev =3D &client->dev; + struct iio_dev *indio_dev; + struct max86150_data *data; + unsigned int part_id; + int ret; + + indio_dev =3D devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data =3D iio_priv(indio_dev); + + data->regmap =3D devm_regmap_init_i2c(client, &max86150_regmap_config); + if (IS_ERR(data->regmap)) + return dev_err_probe(dev, PTR_ERR(data->regmap), + "Failed to init regmap\n"); + + ret =3D devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(max86150_supply_na= mes), + max86150_supply_names); + if (ret) + return dev_err_probe(dev, ret, "Failed to enable supplies\n"); + + ret =3D regmap_read(data->regmap, MAX86150_REG_PART_ID, &part_id); + if (ret) + return dev_err_probe(dev, ret, "Cannot read part ID\n"); + + /* + * Deliberately fatal, not a dev_warn()+continue: chip_init() below + * writes FIFO/PPG/LED configuration blind, with no readback. A + * mismatched part ID means either the wrong device is on this + * address or the bus itself is faulty, and letting chip_init() + * write to that is a worse default than refusing to bind. + */ + if (part_id !=3D MAX86150_PART_ID_VAL) + return dev_err_probe(dev, -ENODEV, + "Unexpected part ID 0x%02x (expected 0x%02x)\n", + part_id, MAX86150_PART_ID_VAL); + + ret =3D max86150_chip_init(data); + if (ret) + return dev_err_probe(dev, ret, "Chip initialisation failed\n"); + + ret =3D devm_add_action_or_reset(dev, max86150_powerdown, data); + if (ret) + return ret; + + indio_dev->name =3D "max86150"; + indio_dev->channels =3D max86150_channels; + indio_dev->num_channels =3D ARRAY_SIZE(max86150_channels); + indio_dev->info =3D &max86150_iio_info; + indio_dev->modes =3D INDIO_DIRECT_MODE; + + ret =3D devm_iio_kfifo_buffer_setup(dev, indio_dev, + &max86150_buffer_setup_ops); + if (ret) + return ret; + + if (client->irq > 0) { + ret =3D devm_request_threaded_irq(dev, client->irq, NULL, + max86150_irq_handler, + IRQF_ONESHOT, + "max86150", indio_dev); + if (ret) + return ret; + } + + return devm_iio_device_register(dev, indio_dev); +} + +static const struct i2c_device_id max86150_id[] =3D { + { .name =3D "max86150" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, max86150_id); + +static const struct of_device_id max86150_of_match[] =3D { + { .compatible =3D "adi,max86150" }, + { } +}; +MODULE_DEVICE_TABLE(of, max86150_of_match); + +static struct i2c_driver max86150_driver =3D { + .driver =3D { + .name =3D "max86150", + .of_match_table =3D max86150_of_match, + }, + .probe =3D max86150_probe, + .id_table =3D max86150_id, +}; +module_i2c_driver(max86150_driver); + +MODULE_AUTHOR("Md Shofiqul Islam "); +MODULE_DESCRIPTION("MAX86150 ECG and PPG biosensor driver"); +MODULE_LICENSE("GPL"); --=20 2.55.0