> Driver implementation for AMS/TAOS tsl2591 ambient light sensor.
please see comments below > > This driver supports configuration via device tree and sysfs. > Supported channels for raw infrared light, raw visible light, > raw combined light and combined lux value. > The driver additionally supports iio events on lower and > upper thresholds. > > This is a very-high sensitivity light-to-digital converter that > transforms light intensity into a digital signal. > > Datasheet Available at: https://ams.com/tsl25911 > > Signed-off-by: Joe Sandom <joe.san...@outlook.com> > --- > Changes in v2: > - Significant modifications to ensure compatibility with standard userspace > ABI > - Removed unneccesary device tree properties where configuration can be > handled either through sysfs or event properties > - Improved readability of code by inlining where appropriate and > modified naming in areas for clarity > - Cleaned up Makefile and Kconfig to follow correct ordering > - Removed noisy print outs and unnecessary use of __func__ > - All chip configuration done in probe before exposing interfaces to > userspace to avoid race conditions > - Removed having events directly from probe, now follows appropriate > event enable path > - Removed channel showing visible light only as no real use case for it. > Channels are now IR (raw), Visible + IR (raw) and Lux. > - Cleaned up binding file to reflect removal of device tree properties > > NOTE: > Apologies that v2 took a while to get submitted, making the changes to > ensure compatibility with the standard userspace ABI took a lot longer > than anticipated! mostly with the conversion of persist cycles to time > in seconds with respect to ADC integration time amongst other things. > > .../bindings/iio/light/amstaos,tsl2591.yaml | 50 + > drivers/iio/light/Kconfig | 11 + > drivers/iio/light/Makefile | 1 + > drivers/iio/light/tsl2591.c | 1247 +++++++++++++++++ > 4 files changed, 1309 insertions(+) > create mode 100644 > Documentation/devicetree/bindings/iio/light/amstaos,tsl2591.yaml > create mode 100644 drivers/iio/light/tsl2591.c > > diff --git a/Documentation/devicetree/bindings/iio/light/amstaos,tsl2591.yaml > b/Documentation/devicetree/bindings/iio/light/amstaos,tsl2591.yaml > new file mode 100644 > index 000000000000..030d0bbfdc7b > --- /dev/null > +++ b/Documentation/devicetree/bindings/iio/light/amstaos,tsl2591.yaml > @@ -0,0 +1,50 @@ > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/iio/light/tsl2591.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: AMS/TAOS TSL2591 Ambient Light Sensor (ALS) > + > +maintainers: > + - Joe Sandom <joe.san...@outlook.com> > + > +description: | > + AMS/TAOS TSL2591 is a very-high sensitivity > + light-to-digital converter that transforms light intensity into a digital > + signal. > + > +properties: > + compatible: > + const: amstaos,tsl2591 > + > + reg: > + maxItems: 1 > + > + interrupts: > + maxItems: 1 > + description: > + Interrupt (INT:Pin 2) Active low. Should be set to > IRQ_TYPE_EDGE_FALLING. > + interrupt is used to detect if lux value has reached below or above > defined Interrupt is it lux always? or just intensity in some cases > + threshold values. > + > +required: > + - compatible > + - reg > + > +additionalProperties: false > + > +examples: > + - | > + #include <dt-bindings/interrupt-controller/irq.h> > + i2c { > + #address-cells = <1>; > + #size-cells = <0>; > + > + tsl2591@29 { > + compatible = "amstaos,tsl2591"; > + reg = <0x29>; > + interrupts = <20 IRQ_TYPE_EDGE_FALLING>; > + }; > + }; > +... > diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig > index 33ad4dd0b5c7..0b0950a94925 100644 > --- a/drivers/iio/light/Kconfig > +++ b/drivers/iio/light/Kconfig > @@ -501,6 +501,17 @@ config TSL2583 > Provides support for the TAOS tsl2580, tsl2581 and tsl2583 devices. > Access ALS data via iio, sysfs. > > +config TSL2591 > + tristate "TAOS TSL2591 ambient light sensor" > + depends on I2C > + help > + Select Y here for support of the AMS/TAOS TSL2591 ambient light > sensor, > + featuring visible and infrared lux output. Access als data via I think lux is defined for visible light only? als -> ALS > + iio and sysfs. Supports iio_events. > + > + To compile this driver as a module, select M: the > + module will be called tsl2591. > + > config TSL2772 > tristate "TAOS TSL/TMD2x71 and TSL/TMD2x72 Family of light and > proximity sensors" > depends on I2C > diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile > index ea376deaca54..d10912faf964 100644 > --- a/drivers/iio/light/Makefile > +++ b/drivers/iio/light/Makefile > @@ -48,6 +48,7 @@ obj-$(CONFIG_ST_UVIS25_SPI) += st_uvis25_spi.o > obj-$(CONFIG_TCS3414) += tcs3414.o > obj-$(CONFIG_TCS3472) += tcs3472.o > obj-$(CONFIG_TSL2583) += tsl2583.o > +obj-$(CONFIG_TSL2591) += tsl2591.o > obj-$(CONFIG_TSL2772) += tsl2772.o > obj-$(CONFIG_TSL4531) += tsl4531.o > obj-$(CONFIG_US5182D) += us5182d.o > diff --git a/drivers/iio/light/tsl2591.c b/drivers/iio/light/tsl2591.c > new file mode 100644 > index 000000000000..fb402ddabeaf > --- /dev/null > +++ b/drivers/iio/light/tsl2591.c > @@ -0,0 +1,1247 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* > + * Copyright (C) 2020 Joe Sandom <joe.san...@outlook.com> > + * > + * Datasheet Available at: https://ams.com/tsl25911 available > + * > + * Device driver for the TAOS TSL2591. This is a very-high sensitivity > + * light-to-digital converter that transforms light intensity into a digital > + * signal. > + */ > + > +#include <linux/debugfs.h> > +#include <linux/delay.h> > +#include <linux/i2c.h> > +#include <linux/interrupt.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/mutex.h> > +#include <linux/pm_runtime.h> > + > +#include <linux/iio/events.h> > +#include <linux/iio/iio.h> > +#include <linux/iio/sysfs.h> > + > +#define als_time_secs_to_ms(x) (((x) + 1) * 100) > +#define als_time_ms_to_secs(x) (((x) / 100) - 1) maybe UPPERCASE macros? > + > +/* TSL2591 Register Set */ > +#define TSL2591_ENABLE 0x00 > +#define TSL2591_CONTROL 0x01 > +#define TSL2591_AILTL 0x04 > +#define TSL2591_AILTH 0x05 > +#define TSL2591_AIHTL 0x06 > +#define TSL2591_AIHTH 0x07 > +#define TSL2591_NP_AILTL 0x08 > +#define TSL2591_NP_AILTH 0x09 > +#define TSL2591_NP_AIHTL 0x0A > +#define TSL2591_NP_AIHTH 0x0B > +#define TSL2591_PERSIST 0x0C > +#define TSL2591_PACKAGE_ID 0x11 > +#define TSL2591_DEVICE_ID 0x12 > +#define TSL2591_STATUS 0x13 > +#define TSL2591_C0_DATAL 0x14 > +#define TSL2591_C0_DATAH 0x15 > +#define TSL2591_C1_DATAL 0x16 > +#define TSL2591_C1_DATAH 0x17 > + > +/* TSL2591 Command Register Masks */ doesn't look like masks, more like values :) > +#define TSL2591_CMD_NOP 0xA0 > +#define TSL2591_CMD_SF_INTSET 0xE4 > +#define TSL2591_CMD_SF_CALS_I 0xE5 > +#define TSL2591_CMD_SF_CALS_NPI 0xE7 > +#define TSL2591_CMD_SF_CNP_ALSI 0xEA > + > +/* TSL2591 Enable Register Masks */ > +#define TSL2591_PWR_ON 0x01 could use BIT() > +#define TSL2591_PWR_OFF 0x00 > +#define TSL2591_ENABLE_ALS 0x02 > +#define TSL2591_ENABLE_ALS_INT 0x10 > +#define TSL2591_ENABLE_SLEEP_INT 0x40 > +#define TSL2591_ENABLE_NP_INT 0x80 > + > +/* TSL2591 Control Register Masks */ > +#define TSL2591_CTRL_ALS_INTEGRATION_100MS 0x00 > +#define TSL2591_CTRL_ALS_INTEGRATION_200MS 0x01 > +#define TSL2591_CTRL_ALS_INTEGRATION_300MS 0x02 > +#define TSL2591_CTRL_ALS_INTEGRATION_400MS 0x03 > +#define TSL2591_CTRL_ALS_INTEGRATION_500MS 0x04 > +#define TSL2591_CTRL_ALS_INTEGRATION_600MS 0x05 > +#define TSL2591_CTRL_ALS_LOW_GAIN 0x00 > +#define TSL2591_CTRL_ALS_MED_GAIN 0x10 > +#define TSL2591_CTRL_ALS_HIGH_GAIN 0x20 > +#define TSL2591_CTRL_ALS_MAX_GAIN 0x30 > +#define TSL2591_CTRL_SYS_RESET 0x80 > + > +/* TSL2591 Persist Register Masks */ not very mask-y > +#define TSL2591_PRST_ALS_INT_CYCLE_0 0x00 > +#define TSL2591_PRST_ALS_INT_CYCLE_ANY 0x01 > +#define TSL2591_PRST_ALS_INT_CYCLE_2 0x02 > +#define TSL2591_PRST_ALS_INT_CYCLE_3 0x03 > +#define TSL2591_PRST_ALS_INT_CYCLE_5 0x04 > +#define TSL2591_PRST_ALS_INT_CYCLE_10 0x05 > +#define TSL2591_PRST_ALS_INT_CYCLE_15 0x06 > +#define TSL2591_PRST_ALS_INT_CYCLE_20 0x07 > +#define TSL2591_PRST_ALS_INT_CYCLE_25 0x08 > +#define TSL2591_PRST_ALS_INT_CYCLE_30 0x09 > +#define TSL2591_PRST_ALS_INT_CYCLE_35 0x0A > +#define TSL2591_PRST_ALS_INT_CYCLE_40 0x0B > +#define TSL2591_PRST_ALS_INT_CYCLE_45 0x0C > +#define TSL2591_PRST_ALS_INT_CYCLE_50 0x0D > +#define TSL2591_PRST_ALS_INT_CYCLE_55 0x0E > +#define TSL2591_PRST_ALS_INT_CYCLE_60 0x0F > +#define TSL2591_PRST_ALS_INT_CYCLE_MAX TSL2591_PRST_ALS_INT_CYCLE_60 > + > +/* TSL2591 Persist Interrupt Cycle Literals */ > +#define TSL2591_PRST_ALS_INT_CYCLE_1_LIT 1 > +#define TSL2591_PRST_ALS_INT_CYCLE_2_LIT 2 > +#define TSL2591_PRST_ALS_INT_CYCLE_3_LIT 3 > +#define TSL2591_PRST_ALS_INT_CYCLE_5_LIT 5 > +#define TSL2591_PRST_ALS_INT_CYCLE_10_LIT 10 > +#define TSL2591_PRST_ALS_INT_CYCLE_15_LIT 15 > +#define TSL2591_PRST_ALS_INT_CYCLE_20_LIT 20 > +#define TSL2591_PRST_ALS_INT_CYCLE_25_LIT 25 > +#define TSL2591_PRST_ALS_INT_CYCLE_30_LIT 30 > +#define TSL2591_PRST_ALS_INT_CYCLE_35_LIT 35 > +#define TSL2591_PRST_ALS_INT_CYCLE_40_LIT 40 > +#define TSL2591_PRST_ALS_INT_CYCLE_45_LIT 45 > +#define TSL2591_PRST_ALS_INT_CYCLE_50_LIT 50 > +#define TSL2591_PRST_ALS_INT_CYCLE_55_LIT 55 > +#define TSL2591_PRST_ALS_INT_CYCLE_60_LIT 60 > + > +/* TSL2591 PID Register Mask */ > +#define TSL2591_PACKAGE_ID_MASK 0x30 > + > +/* TSL2591 ID Register Mask */ > +#define TSL2591_DEVICE_ID_MASK 0xFF > + > +/* TSL2591 Status Register Masks */ > +#define TSL2591_STS_ALS_VALID 0x01 > +#define TSL2591_STS_ALS_INT 0x10 > +#define TSL2591_STS_NPERS_INT 0x20 > +#define TSL2591_STS_VAL_HIGH 0x01 > + > +/* TSL2591 Constant Values */ > +#define TSL2591_PACKAGE_ID_VAL 0x00 > +#define TSL2591_DEVICE_ID_VAL 0x50 > + > +/* Power off suspend delay time MS */ > +#define TSL2591_POWER_OFF_DELAY_MS 2000 > + > +/* TSL2591 Default Values */ there are not just default values > +#define TSL2591_DEFAULT_ALS_INT_TIME > TSL2591_CTRL_ALS_INTEGRATION_300MS > +#define TSL2591_MAX_ALS_INT_TIME_MS 600 > +#define TSL2591_DEFAULT_ALS_GAIN TSL2591_CTRL_ALS_MED_GAIN > +#define TSL2591_NUM_DATA_CHANNELS 4 > +#define TSL2591_DEFAULT_ALS_PERSIST TSL2591_PRST_ALS_INT_CYCLE_ANY > +#define TSL2591_DEFAULT_ALS_LOWER_THRESHOLD 100 > +#define TSL2591_DEFAULT_ALS_UPPER_THRESHOLD 1500 > + > +#define TSL2591_ALS_MAX_VALUE 65535 > +#define TSL2591_ALS_STS_VALID_COUNT 10 > + > +/* LUX Calculations */ > +/* AGAIN values from Adafruits TSL2591 Arduino library */ > +/* https://github.com/adafruit/Adafruit_TSL2591_Library */ > +#define TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER 1 > +#define TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER 25 > +#define TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER 428 > +#define TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER 9876 > +#define TSL2591_LUX_COEFFICIENT 408 > + > +static const u8 tsl2591_data_channels[] = { > + TSL2591_C0_DATAL, > + TSL2591_C0_DATAH, > + TSL2591_C1_DATAL, > + TSL2591_C1_DATAH, > +}; > + > +struct tsl2591_als_readings { > + u16 als_ch0; > + u16 als_ch1; > + u16 als_lux_int; > + u16 als_lux_decimal; > +}; > + > +struct tsl2591_settings { _als_settings for consistency? everything seems to relate to ALS anyway > + u8 als_int_time; > + u8 als_gain; > + u8 als_persist; > + u16 als_lower_threshold; > + u16 als_upper_threshold; > +}; > + > +struct tsl2591_chip { > + /* Ambient light sensor mutex */ who would have guessed :) maybe drop comment > + struct mutex als_mutex; > + struct i2c_client *client; > + struct tsl2591_settings als_settings; > + struct tsl2591_als_readings als_readings; > + > + bool events_enabled; > +}; > + > +/* Period table is als persist cycle x integration time setting */ ALS multi-line comment? > +/* Integration times: 100ms, 200ms, 300ms, 400ms, 500ms, 600ms */ > +/* ALS cycles: 1, 2, 3, 5, 10, 20, 25, 30, 35, 40, 45, 50, 55, 60 */ > +static const char * const tsl2591_als_period_list[] = { > + "0.1 0.2 0.3 0.5 1.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 ", remove space at the end? > + "0.2 0.4 0.6 1.0 2.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0", > + "0.3 0.6 0.9 1.5 3.0 6.0 7.5 9.0 10.5 12.0 13.5 15.0 16.5 18.0", > + "0.4 0.8 1.2 2.0 4.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0 ", remove space at the end? > + "0.5 1.0 1.5 2.5 5.0 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0", > + "0.6 1.2 1.8 3.0 6.0 12.0 15.0 18.0 21.0 24.0 27.0 30.0 33.0 36.0", > +}; > + > +static int tsl2591_gain_to_multiplier(const u8 als_gain) const necessary? just a bit unusual... > +{ > + switch (als_gain) { > + case TSL2591_CTRL_ALS_LOW_GAIN: > + return TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER; > + case TSL2591_CTRL_ALS_MED_GAIN: > + return TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER; > + case TSL2591_CTRL_ALS_HIGH_GAIN: > + return TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER; > + case TSL2591_CTRL_ALS_MAX_GAIN: > + return TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER; > + default: > + break; maybe have the return -EINVAL right here and save some lines? (here and elsewhere) > + } > + > + return -EINVAL; > +} > + > +static u8 tsl2591_multiplier_to_gain(const u32 multiplier) > +{ > + switch (multiplier) { > + case TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER: > + return TSL2591_CTRL_ALS_LOW_GAIN; > + case TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER: > + return TSL2591_CTRL_ALS_MED_GAIN; > + case TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER: > + return TSL2591_CTRL_ALS_HIGH_GAIN; > + case TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER: > + return TSL2591_CTRL_ALS_MAX_GAIN; > + default: > + break; > + } > + > + return -EINVAL; > +} > + > +static int tsl2591_persist_cycle_to_lit(const u8 als_persist) > +{ > + switch (als_persist) { > + case TSL2591_PRST_ALS_INT_CYCLE_ANY: > + return TSL2591_PRST_ALS_INT_CYCLE_1_LIT; > + case TSL2591_PRST_ALS_INT_CYCLE_2: > + return TSL2591_PRST_ALS_INT_CYCLE_2_LIT; > + case TSL2591_PRST_ALS_INT_CYCLE_3: > + return TSL2591_PRST_ALS_INT_CYCLE_3_LIT; > + case TSL2591_PRST_ALS_INT_CYCLE_5: > + return TSL2591_PRST_ALS_INT_CYCLE_5_LIT; > + case TSL2591_PRST_ALS_INT_CYCLE_10: > + return TSL2591_PRST_ALS_INT_CYCLE_10_LIT; > + case TSL2591_PRST_ALS_INT_CYCLE_15: > + return TSL2591_PRST_ALS_INT_CYCLE_15_LIT; > + case TSL2591_PRST_ALS_INT_CYCLE_20: > + return TSL2591_PRST_ALS_INT_CYCLE_20_LIT; > + case TSL2591_PRST_ALS_INT_CYCLE_25: > + return TSL2591_PRST_ALS_INT_CYCLE_25_LIT; > + case TSL2591_PRST_ALS_INT_CYCLE_30: > + return TSL2591_PRST_ALS_INT_CYCLE_30_LIT; > + case TSL2591_PRST_ALS_INT_CYCLE_35: > + return TSL2591_PRST_ALS_INT_CYCLE_35_LIT; > + case TSL2591_PRST_ALS_INT_CYCLE_40: > + return TSL2591_PRST_ALS_INT_CYCLE_40_LIT; > + case TSL2591_PRST_ALS_INT_CYCLE_45: > + return TSL2591_PRST_ALS_INT_CYCLE_45_LIT; > + case TSL2591_PRST_ALS_INT_CYCLE_50: > + return TSL2591_PRST_ALS_INT_CYCLE_50_LIT; > + case TSL2591_PRST_ALS_INT_CYCLE_55: > + return TSL2591_PRST_ALS_INT_CYCLE_55_LIT; > + case TSL2591_PRST_ALS_INT_CYCLE_60: > + return TSL2591_PRST_ALS_INT_CYCLE_60_LIT; > + default: > + break; > + } > + > + return -EINVAL; > +} > + > +static int tsl2591_persist_lit_to_cycle(const u8 als_persist) > +{ > + switch (als_persist) { > + case TSL2591_PRST_ALS_INT_CYCLE_1_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_ANY; > + case TSL2591_PRST_ALS_INT_CYCLE_2_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_2; > + case TSL2591_PRST_ALS_INT_CYCLE_3_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_3; > + case TSL2591_PRST_ALS_INT_CYCLE_5_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_5; > + case TSL2591_PRST_ALS_INT_CYCLE_10_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_10; > + case TSL2591_PRST_ALS_INT_CYCLE_15_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_15; > + case TSL2591_PRST_ALS_INT_CYCLE_20_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_20; > + case TSL2591_PRST_ALS_INT_CYCLE_25_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_25; > + case TSL2591_PRST_ALS_INT_CYCLE_30_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_30; > + case TSL2591_PRST_ALS_INT_CYCLE_35_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_35; > + case TSL2591_PRST_ALS_INT_CYCLE_40_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_40; > + case TSL2591_PRST_ALS_INT_CYCLE_45_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_45; > + case TSL2591_PRST_ALS_INT_CYCLE_50_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_50; > + case TSL2591_PRST_ALS_INT_CYCLE_55_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_55; > + case TSL2591_PRST_ALS_INT_CYCLE_60_LIT: > + return TSL2591_PRST_ALS_INT_CYCLE_60; > + default: > + break; > + } > + > + return -EINVAL; > +} > + > +static int tsl2591_compatible_int_time(struct tsl2591_chip *chip, > + u32 als_integration_time) const u32 for consistency? here and elsewhere > +{ > + switch (als_integration_time) { > + case TSL2591_CTRL_ALS_INTEGRATION_100MS: > + case TSL2591_CTRL_ALS_INTEGRATION_200MS: > + case TSL2591_CTRL_ALS_INTEGRATION_300MS: > + case TSL2591_CTRL_ALS_INTEGRATION_400MS: > + case TSL2591_CTRL_ALS_INTEGRATION_500MS: > + case TSL2591_CTRL_ALS_INTEGRATION_600MS: > + chip->als_settings.als_int_time = als_integration_time; > + return 0; > + default: > + break; > + } > + > + return -EINVAL; > +} > + > +static int tsl2591_compatible_gain(struct tsl2591_chip *chip, u8 als_gain) > +{ > + switch (als_gain) { > + case TSL2591_CTRL_ALS_LOW_GAIN: > + case TSL2591_CTRL_ALS_MED_GAIN: > + case TSL2591_CTRL_ALS_HIGH_GAIN: > + case TSL2591_CTRL_ALS_MAX_GAIN: > + chip->als_settings.als_gain = als_gain; > + return 0; > + default: > + break; > + } > + > + return -EINVAL; > +} > + > +static int tsl2591_compatible_als_persist(struct tsl2591_chip *chip, > + u32 als_persist) > +{ > + switch (als_persist) { > + case TSL2591_PRST_ALS_INT_CYCLE_ANY: > + case TSL2591_PRST_ALS_INT_CYCLE_2: > + case TSL2591_PRST_ALS_INT_CYCLE_3: > + case TSL2591_PRST_ALS_INT_CYCLE_5: > + case TSL2591_PRST_ALS_INT_CYCLE_10: > + case TSL2591_PRST_ALS_INT_CYCLE_15: > + case TSL2591_PRST_ALS_INT_CYCLE_20: > + case TSL2591_PRST_ALS_INT_CYCLE_25: > + case TSL2591_PRST_ALS_INT_CYCLE_30: > + case TSL2591_PRST_ALS_INT_CYCLE_35: > + case TSL2591_PRST_ALS_INT_CYCLE_40: > + case TSL2591_PRST_ALS_INT_CYCLE_45: > + case TSL2591_PRST_ALS_INT_CYCLE_50: > + case TSL2591_PRST_ALS_INT_CYCLE_55: > + case TSL2591_PRST_ALS_INT_CYCLE_60: > + chip->als_settings.als_persist = als_persist; > + return 0; > + default: > + break; > + } > + > + return -EINVAL; > +} > + > +static int tsl2591_wait_adc_complete(struct tsl2591_chip *chip) > +{ > + struct i2c_client *client = chip->client; > + struct tsl2591_settings settings = chip->als_settings; > + int delay = als_time_secs_to_ms(settings.als_int_time); > + int ret; > + int i; > + > + if (!delay) > + return -EINVAL; > + > + /* > + * Sleep for als integration time to allow enough time ALS (here and elsewhere) > + * for an ADC read cycle to complete. Check status after > + * delay for als valid > + */ > + msleep(delay); > + > + /* Check for status als valid flag for up to 100ms */ > + for (i = 0; i < TSL2591_ALS_STS_VALID_COUNT; ++i) { > + ret = i2c_smbus_read_byte_data(client, TSL2591_CMD_NOP | > + TSL2591_STATUS); > + if (ret < 0) { > + dev_err(&client->dev, "failed to read register\n"); > + return -EINVAL; > + } > + > + if ((ret & TSL2591_STS_ALS_VALID) == TSL2591_STS_VAL_HIGH) > + break; > + > + if (i == (TSL2591_ALS_STS_VALID_COUNT - 1)) > + return -ENODATA; > + > + usleep_range(9000, 10000); > + } > + > + return 0; > +} > + > +/** > + * tsl2591_read_channel_data() - Reads raw channel data and calculates lux > + * > + * Formula for lux calculation; > + * Derived from Adafruit's TSL2591 library > + * Link: https://github.com/adafruit/Adafruit_TSL2591_Library > + * Counts Per Lux (CPL) = (ATIME_ms * AGAIN) / LUX DF > + * lux = ((C0DATA - C1DATA) * (1 - (C1DATA / C0DATA))) / CPL > + * > + * Scale values to get more representative value of lux i.e. > + * lux = ((C0DATA - C1DATA) * (1000 - ((C1DATA * 1000) / C0DATA))) / CPL > + * > + * Channel 0 = IR + Visible > + * Channel 1 = IR only > + * Visible = Channel 0 - Channel 1 > + * > + */ > +static int tsl2591_read_channel_data(struct iio_dev *indio_dev) > +{ > + struct tsl2591_chip *chip = iio_priv(indio_dev); > + struct tsl2591_settings *settings = &chip->als_settings; > + struct i2c_client *client = chip->client; > + int i; > + int ret; > + u8 channel_data[TSL2591_NUM_DATA_CHANNELS]; > + > + int counts_per_lux; > + int lux; > + int gain_multiplier; > + > + ret = tsl2591_wait_adc_complete(chip); > + if (ret < 0) { > + dev_err(&client->dev, "No data available. Err: %d\n", ret); > + return -ENODATA; return ret; _wait_adc_complete() may also return -EINVAL > + } > + > + for (i = 0; i < TSL2591_NUM_DATA_CHANNELS; ++i) { > + int reg = TSL2591_CMD_NOP | tsl2591_data_channels[i]; > + > + ret = i2c_smbus_read_byte_data(client, TSL2591_CMD_NOP | reg); > + if (ret < 0) { > + dev_err(&client->dev, > + "Failed to read register %#04x\n", reg); > + return -EINVAL; > + } > + channel_data[i] = ret; > + } > + > + chip->als_readings.als_ch0 = > + le16_to_cpup((const __le16 *)&channel_data[0]); > + chip->als_readings.als_ch1 = > + le16_to_cpup((const __le16 *)&channel_data[2]); > + > + dev_dbg(&client->dev, "both: %d\n", chip->als_readings.als_ch0); > + dev_dbg(&client->dev, "ir: %d\n", chip->als_readings.als_ch1); > + > + gain_multiplier = tsl2591_gain_to_multiplier(settings->als_gain); > + if (gain_multiplier < 0) { > + dev_err(&client->dev, "Invalid multiplier. Err: %d\n", > + gain_multiplier); > + return -EINVAL; > + } > + > + /* Calculate counts per lux value */ > + counts_per_lux = (als_time_secs_to_ms(settings->als_int_time) * > + gain_multiplier) / TSL2591_LUX_COEFFICIENT; > + > + dev_dbg(&client->dev, "Counts Per Lux (CPL): %d\n", counts_per_lux); > + > + /* Calculate lux value */ > + lux = ((chip->als_readings.als_ch0 - chip->als_readings.als_ch1) * > + (1000 - ((chip->als_readings.als_ch1 * 1000) / > + chip->als_readings.als_ch0))) / counts_per_lux; > + > + /* Divide by 1000 to get real lux value before scaling */ > + chip->als_readings.als_lux_int = lux / 1000; > + > + /* Get the decimal part of lux reading */ > + chip->als_readings.als_lux_decimal = > + (lux - (chip->als_readings.als_lux_int * 1000)); > + > + dev_dbg(&client->dev, "Raw lux calculation: %d\n", lux); > + > + return ret; > +} > + > +static int tsl2591_set_als_gain_int_time(struct tsl2591_chip *chip) > +{ > + struct i2c_client *client = chip->client; > + struct tsl2591_settings als_settings = chip->als_settings; > + int ret; > + > + ret = i2c_smbus_write_byte_data(client, > + TSL2591_CMD_NOP | TSL2591_CONTROL, > + als_settings.als_int_time | > + als_settings.als_gain); > + if (ret < 0) > + dev_err(&client->dev, "Failed to set als gain & int time\n"); > + > + return ret; > +} > + > +static int tsl2591_set_als_thresholds(struct tsl2591_chip *chip) > +{ > + struct i2c_client *client = chip->client; > + struct tsl2591_settings als_settings = chip->als_settings; > + int ret; > + > + u8 als_lower_l; > + u8 als_lower_h; > + u8 als_upper_l; > + u8 als_upper_h; > + > + if (als_settings.als_lower_threshold >= > als_settings.als_upper_threshold) { > + dev_warn(&client->dev, "lower threshold higher than upper\n"); > + return -EINVAL; > + } > + > + if (als_settings.als_upper_threshold > TSL2591_ALS_MAX_VALUE) { > + dev_warn(&client->dev, "upper threshold higher than max\n"); > + return -EINVAL; > + } > + > + als_lower_l = (als_settings.als_lower_threshold & 0x00FF); > + als_lower_h = ((als_settings.als_lower_threshold >> 8) & 0x00FF); > + als_upper_l = (als_settings.als_upper_threshold & 0x00FF); > + als_upper_h = ((als_settings.als_upper_threshold >> 8) & 0x00FF); > + > + dev_dbg(&client->dev, "Setting configuration - als lower l: %#04x\n", > + als_lower_l); > + dev_dbg(&client->dev, "Setting configuration - als lower h: %#04x\n", > + als_lower_h); > + dev_dbg(&client->dev, "Setting configuration - als upper l: %#04x\n", > + als_upper_l); > + dev_dbg(&client->dev, "Setting configuration - als upper h: %#04x\n", > + als_upper_h); > + > + ret = i2c_smbus_write_byte_data(client, TSL2591_CMD_NOP | > + TSL2591_AILTL, als_lower_l); > + if (ret < 0) > + dev_err(&client->dev, "Failed to set als lower threshold\n"); > + > + ret = i2c_smbus_write_byte_data(client, TSL2591_CMD_NOP | > + TSL2591_AILTH, als_lower_h); > + if (ret < 0) > + dev_err(&client->dev, "Failed to set als lower threshold\n"); > + > + ret = i2c_smbus_write_byte_data(client, TSL2591_CMD_NOP | > + TSL2591_AIHTL, als_upper_l); > + if (ret < 0) > + dev_err(&client->dev, "Failed to set als upper threshold\n"); > + > + ret = i2c_smbus_write_byte_data(client, TSL2591_CMD_NOP | > + TSL2591_AIHTH, als_upper_h); > + if (ret < 0) > + dev_err(&client->dev, "Failed to set als upper threshold\n"); > + > + return ret; > +} > + > +static int tsl2591_set_als_persist_cycle(struct tsl2591_chip *chip) > +{ > + struct i2c_client *client = chip->client; > + struct tsl2591_settings als_settings = chip->als_settings; > + int ret; > + > + ret = i2c_smbus_write_byte_data(client, TSL2591_CMD_NOP | > + TSL2591_PERSIST, als_settings.als_persist); > + if (ret < 0) > + dev_err(&client->dev, "Failed to set als persist cycle\n"); > + > + return ret; > +} > + > +static int tsl2591_set_power_state(struct tsl2591_chip *chip, u8 state) > +{ > + struct i2c_client *client = chip->client; > + int ret; > + > + ret = i2c_smbus_write_byte_data(client, TSL2591_CMD_NOP | > + TSL2591_ENABLE, state); > + if (ret < 0) > + dev_err(&client->dev, > + "Failed to set the power state to %#04x\n", state); > + > + return ret; > +} > + > +static int tsl2591_get_power_state(struct tsl2591_chip *chip) > +{ > + struct i2c_client *client = chip->client; > + int ret; > + > + ret = i2c_smbus_read_byte_data(client, TSL2591_CMD_NOP | > + TSL2591_ENABLE); > + if (ret < 0) > + dev_err(&client->dev, "Failed to get power state\n"); > + > + return ret; > +} > + > +static ssize_t in_illuminance_integration_time_show(struct device *dev, tsl2591_ prefix missing > + struct device_attribute > *attr, > + char *buf) > +{ > + struct iio_dev *indio_dev = dev_to_iio_dev(dev); > + struct tsl2591_chip *chip = iio_priv(indio_dev); > + int ret; > + > + int als_int_time = als_time_secs_to_ms(chip->als_settings.als_int_time); > + > + mutex_lock(&chip->als_mutex); what purpose does the mutex serve? > + ret = sprintf(buf, "%d\n", als_int_time); > + mutex_unlock(&chip->als_mutex); > + > + return ret; > +} > + > +static ssize_t in_illuminance_integration_time_store(struct device *dev, tsl2591_ prefix > + struct device_attribute > *attr, > + const char *buf, size_t > len) > +{ > + struct iio_dev *indio_dev = dev_to_iio_dev(dev); > + struct tsl2591_chip *chip = iio_priv(indio_dev); > + struct i2c_client *client = chip->client; > + > + u32 int_time; > + int value; > + > + if (kstrtoint(buf, 0, &value) || !value) > + return -EINVAL; > + > + mutex_lock(&chip->als_mutex); > + > + int_time = als_time_ms_to_secs(value); > + > + if (tsl2591_compatible_int_time(chip, int_time)) > + goto calibrate_error; > + > + if (tsl2591_set_als_gain_int_time(chip)) > + goto calibrate_error; > + > + mutex_unlock(&chip->als_mutex); > + > + return len; > + > +calibrate_error: > + dev_err(&client->dev, "Failed to calibrate sensor\n"); > + mutex_unlock(&chip->als_mutex); > + return -EINVAL; > +} > + > +static ssize_t in_illuminance_calibscale_show(struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct iio_dev *indio_dev = dev_to_iio_dev(dev); > + struct tsl2591_chip *chip = iio_priv(indio_dev); > + int ret; > + > + mutex_lock(&chip->als_mutex); > + ret = sprintf(buf, "%d\n", tsl2591_gain_to_multiplier > + (chip->als_settings.als_gain)); > + mutex_unlock(&chip->als_mutex); > + > + return ret; > +} > + > +static ssize_t in_illuminance_calibscale_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, size_t len) > +{ > + struct iio_dev *indio_dev = dev_to_iio_dev(dev); > + struct tsl2591_chip *chip = iio_priv(indio_dev); > + struct i2c_client *client = chip->client; > + > + u8 gain; > + int value; > + > + if (kstrtoint(buf, 0, &value) || !value) > + return -EINVAL; > + > + mutex_lock(&chip->als_mutex); > + > + gain = tsl2591_multiplier_to_gain(value); > + > + if (tsl2591_compatible_gain(chip, gain)) > + goto calibrate_error; > + > + if (tsl2591_set_als_gain_int_time(chip)) > + goto calibrate_error; > + > + mutex_unlock(&chip->als_mutex); > + > + return len; > + > +calibrate_error: > + dev_err(&client->dev, "Failed to calibrate sensor\n"); > + mutex_unlock(&chip->als_mutex); > + return -EINVAL; > +} > + > +static ssize_t in_illuminance_period_available_show(struct device *dev, > + struct device_attribute > *attr, > + char *buf) > +{ > + struct iio_dev *indio_dev = dev_to_iio_dev(dev); > + struct tsl2591_chip *chip = iio_priv(indio_dev); > + int ret; > + > + mutex_lock(&chip->als_mutex); > + ret = snprintf(buf, PAGE_SIZE, "%s\n", > + > tsl2591_als_period_list[chip->als_settings.als_int_time]); > + mutex_unlock(&chip->als_mutex); > + > + return ret; > +} > + > +static IIO_CONST_ATTR(in_illuminance_integration_time_available, > + "100 200 300 400 500 600"); > +static IIO_CONST_ATTR(in_illuminance_calibscale_available, > + "1 25 428 9876"); > +static IIO_DEVICE_ATTR_RW(in_illuminance_integration_time, 0); > +static IIO_DEVICE_ATTR_RW(in_illuminance_calibscale, 0); > + > +static struct attribute *tsl2591_sysfs_attrs_ctrl[] = { > + &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr, > + &iio_const_attr_in_illuminance_calibscale_available.dev_attr.attr, > + &iio_dev_attr_in_illuminance_integration_time.dev_attr.attr, > + &iio_dev_attr_in_illuminance_calibscale.dev_attr.attr, > + NULL > +}; > + > +static const struct attribute_group tsl2591_sysfs_attribute_group = { > + .attrs = tsl2591_sysfs_attrs_ctrl, > +}; > + > +static IIO_DEVICE_ATTR_RO(in_illuminance_period_available, 0); > + > +static struct attribute *tsl2591_event_attrs_ctrl[] = { > + &iio_dev_attr_in_illuminance_period_available.dev_attr.attr, > + NULL > +}; > + > +static const struct attribute_group tsl2591_event_attribute_group = { > + .attrs = tsl2591_event_attrs_ctrl, > +}; > + > +static const struct iio_event_spec tsl2591_events[] = { > + { > + .type = IIO_EV_TYPE_THRESH, > + .dir = IIO_EV_DIR_RISING, > + .mask_separate = BIT(IIO_EV_INFO_VALUE), > + }, { > + .type = IIO_EV_TYPE_THRESH, > + .dir = IIO_EV_DIR_FALLING, > + .mask_separate = BIT(IIO_EV_INFO_VALUE), > + }, { > + .type = IIO_EV_TYPE_THRESH, > + .dir = IIO_EV_DIR_EITHER, > + .mask_separate = BIT(IIO_EV_INFO_PERIOD) | > + BIT(IIO_EV_INFO_ENABLE), > + }, > +}; > + > +static const struct iio_chan_spec tsl2591_channels[] = { > + { > + .type = IIO_INTENSITY, > + .modified = 1, > + .channel2 = IIO_MOD_LIGHT_IR, > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), > + }, > + { > + .type = IIO_INTENSITY, > + .modified = 1, > + .channel2 = IIO_MOD_LIGHT_BOTH, > + .event_spec = tsl2591_events, > + .num_event_specs = ARRAY_SIZE(tsl2591_events), > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), > + }, > + { > + .type = IIO_LIGHT, > + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), > + }, > +}; > + > +static int tsl2591_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, > + int *val, int *val2, long mask) > +{ > + struct tsl2591_chip *chip = iio_priv(indio_dev); > + struct i2c_client *client = chip->client; > + int ret; > + > + dev_dbg(&client->dev, "Reading from sensor"); > + > + pm_runtime_get_sync(&chip->client->dev); > + > + mutex_lock(&chip->als_mutex); > + > + ret = -EINVAL; > + switch (mask) { > + case IIO_CHAN_INFO_RAW: > + if (chan->type == IIO_INTENSITY) { > + ret = tsl2591_read_channel_data(indio_dev); > + if (ret < 0) > + break; > + > + if (chan->channel2 == IIO_MOD_LIGHT_BOTH) { > + *val = chip->als_readings.als_ch0; > + ret = IIO_VAL_INT; > + } else if (chan->channel2 == IIO_MOD_LIGHT_IR) { > + *val = chip->als_readings.als_ch1; > + ret = IIO_VAL_INT; > + } else { > + ret = -EINVAL; > + } > + } > + break; > + case IIO_CHAN_INFO_PROCESSED: > + if (chan->type == IIO_LIGHT) { > + ret = tsl2591_read_channel_data(indio_dev); > + if (ret < 0) > + break; > + *val = chip->als_readings.als_lux_int; > + *val2 = (chip->als_readings.als_lux_decimal * 1000); > + ret = IIO_VAL_INT_PLUS_MICRO; > + } > + break; > + } > + > + mutex_unlock(&chip->als_mutex); > + > + pm_runtime_mark_last_busy(&chip->client->dev); > + pm_runtime_put_autosuspend(&chip->client->dev); > + > + return ret; > +} > + > +static int tsl2591_read_event_value(struct iio_dev *indio_dev, > + const struct iio_chan_spec *chan, > + enum iio_event_type type, > + enum iio_event_direction dir, > + enum iio_event_info info, int *val, > + int *val2) > +{ > + struct tsl2591_chip *chip = iio_priv(indio_dev); > + struct i2c_client *client = chip->client; > + int als_persist; > + int period; > + int ret; > + int int_time; > + > + switch (info) { > + case IIO_EV_INFO_VALUE: > + switch (dir) { > + case IIO_EV_DIR_RISING: > + mutex_lock(&chip->als_mutex); > + *val = chip->als_settings.als_upper_threshold; > + mutex_unlock(&chip->als_mutex); > + break; > + case IIO_EV_DIR_FALLING: > + mutex_lock(&chip->als_mutex); > + *val = chip->als_settings.als_lower_threshold; > + mutex_unlock(&chip->als_mutex); > + break; > + default: > + return -EINVAL; > + } > + ret = IIO_VAL_INT; > + break; > + case IIO_EV_INFO_PERIOD: > + mutex_lock(&chip->als_mutex); > + > + ret = i2c_smbus_read_byte_data(client, > + TSL2591_CMD_NOP | > TSL2591_PERSIST); > + if (ret <= 0 || ret > TSL2591_PRST_ALS_INT_CYCLE_MAX) > + goto err; > + > + als_persist = tsl2591_persist_cycle_to_lit(ret); > + int_time = als_time_secs_to_ms(chip->als_settings.als_int_time); > + period = als_persist * (int_time * MSEC_PER_SEC); > + > + *val = period / USEC_PER_SEC; > + *val2 = period % USEC_PER_SEC; > + > + mutex_unlock(&chip->als_mutex); > + ret = IIO_VAL_INT_PLUS_MICRO; > + break; > + default: > + return -EINVAL; > + } > + > + return ret; > + > +err: > + mutex_unlock(&chip->als_mutex); > + return -EINVAL; > +} > + > +static int tsl2591_write_event_value(struct iio_dev *indio_dev, > + const struct iio_chan_spec *chan, > + enum iio_event_type type, > + enum iio_event_direction dir, > + enum iio_event_info info, int val, > + int val2) > +{ > + struct tsl2591_chip *chip = iio_priv(indio_dev); > + int period, int_time, als_cycle; > + > + if (val < 0 || val2 < 0) > + return -EINVAL; > + > + switch (info) { > + case IIO_EV_INFO_VALUE: > + if (val > TSL2591_ALS_MAX_VALUE) > + return -EINVAL; > + /* Lower threshold should not be higher than upper */ > + if (dir == IIO_EV_DIR_FALLING) > + if (val > chip->als_settings.als_upper_threshold) > + return -EINVAL; > + > + switch (dir) { > + case IIO_EV_DIR_RISING: > + mutex_lock(&chip->als_mutex); > + chip->als_settings.als_upper_threshold = val; > + if (tsl2591_set_als_thresholds(chip)) > + goto err; > + mutex_unlock(&chip->als_mutex); > + break; > + case IIO_EV_DIR_FALLING: > + mutex_lock(&chip->als_mutex); > + chip->als_settings.als_lower_threshold = val; > + if (tsl2591_set_als_thresholds(chip)) > + goto err; > + mutex_unlock(&chip->als_mutex); > + break; > + default: > + return -EINVAL; > + } > + break; > + case IIO_EV_INFO_PERIOD: > + mutex_lock(&chip->als_mutex); > + int_time = als_time_secs_to_ms(chip->als_settings.als_int_time); > + if (!val && val2) > + period = (val2 / MSEC_PER_SEC) / int_time; > + else if (val && !val2) > + period = (val * MSEC_PER_SEC) / int_time; > + else if (val && val2) > + period = ((val * MSEC_PER_SEC) + > + (val2 / MSEC_PER_SEC)) / int_time; > + else > + goto err; > + > + als_cycle = tsl2591_persist_lit_to_cycle(period); > + if (als_cycle < 0) > + goto err; > + if (tsl2591_compatible_als_persist(chip, als_cycle)) > + goto err; > + if (tsl2591_set_als_persist_cycle(chip)) > + goto err; > + mutex_unlock(&chip->als_mutex); > + break; > + default: > + return -EINVAL; > + } > + > + return 0; > +err: > + mutex_unlock(&chip->als_mutex); > + return -EINVAL; > +} > + > +static int tsl2591_read_event_config(struct iio_dev *indio_dev, > + const struct iio_chan_spec *chan, > + enum iio_event_type type, > + enum iio_event_direction dir) > +{ > + struct tsl2591_chip *chip = iio_priv(indio_dev); > + int ret; > + > + mutex_lock(&chip->als_mutex); > + ret = tsl2591_get_power_state(chip); > + mutex_unlock(&chip->als_mutex); > + if (ret < 0) > + return ret; > + > + return !!(ret & TSL2591_ENABLE_ALS_INT); > +} > + > +static int tsl2591_write_event_config(struct iio_dev *indio_dev, > + const struct iio_chan_spec *chan, > + enum iio_event_type type, > + enum iio_event_direction dir, > + int state) > +{ > + struct tsl2591_chip *chip = iio_priv(indio_dev); > + struct i2c_client *client = chip->client; > + > + if (state && !chip->events_enabled) { > + chip->events_enabled = true; > + pm_runtime_get_sync(&client->dev); > + } else if (!state && chip->events_enabled) { > + chip->events_enabled = false; > + pm_runtime_mark_last_busy(&client->dev); > + pm_runtime_put_autosuspend(&client->dev); > + } > + > + return 0; > +} > + > +static const struct iio_info tsl2591_info = { > + .attrs = &tsl2591_sysfs_attribute_group, > + .event_attrs = &tsl2591_event_attribute_group, > + .read_raw = tsl2591_read_raw, > + .read_event_value = tsl2591_read_event_value, > + .write_event_value = tsl2591_write_event_value, > + .read_event_config = tsl2591_read_event_config, > + .write_event_config = tsl2591_write_event_config, > +}; > + > +static int __maybe_unused tsl2591_suspend(struct device *dev) > +{ > + struct iio_dev *indio_dev = dev_get_drvdata(dev); > + struct tsl2591_chip *chip = iio_priv(indio_dev); > + int ret; > + > + mutex_lock(&chip->als_mutex); > + ret = tsl2591_set_power_state(chip, TSL2591_PWR_OFF); > + mutex_unlock(&chip->als_mutex); > + > + return ret; > +} > + > +static int __maybe_unused tsl2591_resume(struct device *dev) > +{ > + struct iio_dev *indio_dev = dev_get_drvdata(dev); > + struct tsl2591_chip *chip = iio_priv(indio_dev); > + int ret; > + int power_state; > + > + if (chip->events_enabled) > + power_state = TSL2591_PWR_ON | TSL2591_ENABLE_ALS_INT | > + TSL2591_ENABLE_ALS; > + else > + power_state = TSL2591_PWR_ON | TSL2591_ENABLE_ALS; > + > + mutex_lock(&chip->als_mutex); > + ret = tsl2591_set_power_state(chip, power_state); > + mutex_unlock(&chip->als_mutex); > + > + return ret; > +} > + > +static const struct dev_pm_ops tsl2591_pm_ops = { > + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, > + pm_runtime_force_resume) > + SET_RUNTIME_PM_OPS(tsl2591_suspend, tsl2591_resume, NULL) > +}; > + > +static irqreturn_t tsl2591_event_handler(int irq, void *private) > +{ > + struct iio_dev *dev_info = private; > + struct tsl2591_chip *chip = iio_priv(dev_info); > + struct i2c_client *client = chip->client; > + int ret; > + > + if (!chip->events_enabled) > + return IRQ_HANDLED; > + > + iio_push_event(dev_info, > + IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0, > + IIO_EV_TYPE_THRESH, > + IIO_EV_DIR_EITHER), > + iio_get_time_ns(dev_info)); > + > + /* Clear als irq */ > + ret = i2c_smbus_write_byte(client, TSL2591_CMD_SF_CALS_NPI); > + if (ret < 0) > + dev_err(&client->dev, "failed to clear als irq\n"); > + > + return IRQ_HANDLED; > +} > + > +static int tsl2591_load_defaults(struct tsl2591_chip *chip) > +{ > + struct i2c_client *client = chip->client; > + > + chip->als_settings.als_int_time = TSL2591_DEFAULT_ALS_INT_TIME; > + chip->als_settings.als_gain = TSL2591_DEFAULT_ALS_GAIN; > + chip->als_settings.als_persist = TSL2591_DEFAULT_ALS_PERSIST; > + chip->als_settings.als_lower_threshold = > + TSL2591_DEFAULT_ALS_LOWER_THRESHOLD; > + chip->als_settings.als_upper_threshold = > + TSL2591_DEFAULT_ALS_UPPER_THRESHOLD; > + > + if (tsl2591_set_als_gain_int_time(chip)) { > + dev_err(&client->dev, "Failed to set als gain and int time\n"); > + return -EINVAL; > + } > + > + if (tsl2591_set_als_persist_cycle(chip)) { > + dev_err(&client->dev, "Failed to set als thresholds\n"); wrong message, should refer to persist_cycle? > + return -EINVAL; > + } > + > + if (tsl2591_set_als_thresholds(chip)) { > + dev_err(&client->dev, "Failed to set als thresholds\n"); > + return -EINVAL; > + } > + > + return 0; > +} > + > +static void tsl2591_chip_off(void *data) > +{ > + struct iio_dev *indio_dev = data; > + struct tsl2591_chip *chip = iio_priv(indio_dev); > + struct i2c_client *client = chip->client; > + > + pm_runtime_disable(&client->dev); > + pm_runtime_set_suspended(&client->dev); > + pm_runtime_put_noidle(&client->dev); > + > + tsl2591_set_power_state(chip, TSL2591_PWR_OFF); > +} > + > +static int tsl2591_probe(struct i2c_client *client) > +{ > + struct tsl2591_chip *chip; > + struct iio_dev *indio_dev; > + int ret; > + > + if (!i2c_check_functionality(client->adapter, > + I2C_FUNC_SMBUS_BYTE_DATA)) { > + dev_err(&client->dev, > + "I2C smbus byte data functionality is not supported\n"); > + return -EOPNOTSUPP; > + } > + > + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip)); > + if (!indio_dev) > + return -ENOMEM; > + > + chip = iio_priv(indio_dev); > + chip->client = client; > + i2c_set_clientdata(client, indio_dev); > + > + if (client->irq) { > + ret = devm_request_threaded_irq(&client->dev, client->irq, > + NULL, tsl2591_event_handler, > + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, > + "tsl2591_irq", indio_dev); > + if (ret) { > + dev_err(&client->dev, "irq request error %d\n", -ret); > + return -EINVAL; > + } > + } > + > + mutex_init(&chip->als_mutex); > + > + ret = i2c_smbus_read_byte_data(client, > + TSL2591_CMD_NOP | TSL2591_DEVICE_ID); > + if (ret < 0) { > + dev_err(&client->dev, > + "Failed to read the device ID register\n"); > + return ret; > + } > + > + if ((ret & TSL2591_DEVICE_ID_MASK) != TSL2591_DEVICE_ID_VAL) { > + dev_err(&client->dev, "Device ID: %#04x unknown\n", ret); > + return -EINVAL; > + } > + > + indio_dev->info = &tsl2591_info; > + indio_dev->channels = tsl2591_channels; > + indio_dev->num_channels = ARRAY_SIZE(tsl2591_channels); > + indio_dev->modes = INDIO_DIRECT_MODE; > + indio_dev->name = chip->client->name; > + chip->events_enabled = false; > + > + pm_runtime_enable(&client->dev); > + pm_runtime_set_autosuspend_delay(&client->dev, > + TSL2591_POWER_OFF_DELAY_MS); > + pm_runtime_use_autosuspend(&client->dev); > + > + if (tsl2591_load_defaults(chip)) { > + dev_err(&client->dev, "Failed to load sensor defaults\n"); > + return -EINVAL; > + } > + > + ret = i2c_smbus_write_byte(client, TSL2591_CMD_SF_CALS_NPI); > + if (ret < 0) { > + dev_err(&client->dev, "failed to clear als irq\n"); maybe consistent first letter: Failed vs failed > + return -EINVAL; > + } > + > + /* Add chip off to automatically managed path */ > + ret = devm_add_action_or_reset(&client->dev, > + tsl2591_chip_off, > + indio_dev); > + if (ret < 0) > + return -EINVAL; > + > + ret = devm_iio_device_register(&client->dev, indio_dev); > + if (ret) { > + dev_err(&client->dev, "iio registration failed\n"); probably not a very informative message > + return ret; > + } > + > + dev_info(&client->dev, "Probe complete - tsl2591 found.\n"); message needed? > + > + return 0; > +} > + > +static const struct of_device_id tsl2591_of_match[] = { > + { .compatible = "amstaos,tsl2591"}, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, tsl2591_of_match); > + > +static struct i2c_driver tsl2591_driver = { > + .driver = { > + .name = "tsl2591", > + .pm = &tsl2591_pm_ops, > + .of_match_table = tsl2591_of_match, > + }, > + .probe_new = tsl2591_probe, > +}; > +module_i2c_driver(tsl2591_driver); > + > +MODULE_AUTHOR("Joe Sandom <joe.san...@outlook.com>"); > +MODULE_DESCRIPTION("TAOS tsl2591 ambient light sensor driver"); > +MODULE_LICENSE("GPL"); > -- Peter Meerwald-Stadler Mobile: +43 664 24 44 418
