| Message ID | 20191007153917.13611-3-manivannan.sadhasivam@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | Add support for ADUX1020 sensor | expand |
Hi Jonathan, Thanks for the review! On Tue, Oct 08, 2019 at 01:27:44PM +0100, Jonathan Cameron wrote: > On Mon, 7 Oct 2019 21:09:17 +0530 > Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> wrote: > > > Add initial support for Analog Devices ADUX1020 Photometric sensor. > > Only proximity mode has been enabled for now. > > > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> > > Hi Manivannan, > > Various minor comments inline. > > Thanks, > > Jonathan > > > --- > > drivers/iio/light/Kconfig | 11 + > > drivers/iio/light/Makefile | 1 + > > drivers/iio/light/adux1020.c | 783 +++++++++++++++++++++++++++++++++++ > > 3 files changed, 795 insertions(+) > > create mode 100644 drivers/iio/light/adux1020.c > > > > diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig > > index 08d7e1ef2186..3f8c8689cd89 100644 > > --- a/drivers/iio/light/Kconfig > > +++ b/drivers/iio/light/Kconfig > > @@ -32,6 +32,17 @@ config ADJD_S311 > > This driver can also be built as a module. If so, the module > > will be called adjd_s311. > > > > +config ADUX1020 > > + tristate "ADUX1020 photometric sensor" > > + select REGMAP_I2C > > + depends on I2C > > + help > > + Say Y here if you want to build a driver for the Analog Devices > > + ADUX1020 photometric sensor. > > + > > + To compile this driver as a module, choose M here: the > > + module will be called adux1020. > > + > > config AL3320A > > tristate "AL3320A ambient light sensor" > > depends on I2C > > diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile > > index 00d1f9b98f39..5d650ce46a40 100644 > > --- a/drivers/iio/light/Makefile > > +++ b/drivers/iio/light/Makefile > > @@ -6,6 +6,7 @@ > > # When adding new entries keep the list in alphabetical order > > obj-$(CONFIG_ACPI_ALS) += acpi-als.o > > obj-$(CONFIG_ADJD_S311) += adjd_s311.o > > +obj-$(CONFIG_ADUX1020) += adux1020.o > > obj-$(CONFIG_AL3320A) += al3320a.o > > obj-$(CONFIG_APDS9300) += apds9300.o > > obj-$(CONFIG_APDS9960) += apds9960.o > > diff --git a/drivers/iio/light/adux1020.c b/drivers/iio/light/adux1020.c > > new file mode 100644 > > index 000000000000..d0b76e5b44f1 > > --- /dev/null > > +++ b/drivers/iio/light/adux1020.c > > @@ -0,0 +1,783 @@ > > +// SPDX-License-Identifier: GPL-2.0+ > > +/* > > + * adux1020.c - Support for Analog Devices ADUX1020 photometric sensor > > + * > > + * Copyright (C) 2019 Linaro Ltd. > > + * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> > > + * > > + * TODO: Triggered buffer support > > + */ > > + > > +#include <linux/delay.h> > > +#include <linux/err.h> > > +#include <linux/i2c.h> > > +#include <linux/init.h> > > +#include <linux/interrupt.h> > > +#include <linux/irq.h> > > +#include <linux/module.h> > > +#include <linux/mutex.h> > > +#include <linux/regmap.h> > > + > > +#include <linux/iio/iio.h> > > +#include <linux/iio/sysfs.h> > > +#include <linux/iio/events.h> > > + > > +#define ADUX1020_REGMAP_NAME "adux1020_regmap" > > +#define ADUX1020_DRV_NAME "adux1020" > > + > > +/* System registers */ > > +#define ADUX1020_REG_CHIP_ID 0x08 > > +#define ADUX1020_REG_SLAVE_ADDRESS 0x09 > > + > > +#define ADUX1020_REG_SW_RESET 0x0f > > +#define ADUX1020_REG_INT_ENABLE 0x1c > > +#define ADUX1020_REG_INT_POLARITY 0x1d > > +#define ADUX1020_REG_PROX_TH_ON1 0x2a > > +#define ADUX1020_REG_PROX_TH_OFF1 0x2b > > +#define ADUX1020_REG_PROX_TYPE 0x2f > > +#define ADUX1020_REG_TEST_MODES_3 0x32 > > +#define ADUX1020_REG_FORCE_MODE 0x33 > > +#define ADUX1020_REG_FREQUENCY 0x40 > > +#define ADUX1020_REG_LED_CURRENT 0x41 > > +#define ADUX1020_REG_OP_MODE 0x45 > > +#define ADUX1020_REG_INT_MASK 0x48 > > +#define ADUX1020_REG_INT_STATUS 0x49 > > +#define ADUX1020_REG_DATA_BUFFER 0x60 > > + > > +/* Chip ID bits */ > > +#define ADUX1020_CHIP_ID_MASK GENMASK(11, 0) > > +#define ADUX1020_CHIP_ID 0x03fc > > + > > +#define ADUX1020_MODE_OUT_SHIFT 4 > > +#define ADUX1020_MODE_OUT_PROX_I 1 > > +#define ADUX1020_MODE_OUT_PROX_XY 3 > > + > > +#define ADUX1020_SW_RESET BIT(1) > > +#define ADUX1020_FIFO_FLUSH BIT(15) > > +#define ADUX1020_OP_MODE_MASK GENMASK(3, 0) > > +#define ADUX1020_DATA_OUT_MODE_MASK GENMASK(7, 4) > > + > > +#define ADUX1020_MODE_INT_MASK GENMASK(7, 0) > > +#define ADUX1020_INT_ENABLE 0x2096 > > +#define ADUX1020_INT_DISABLE 0x2090 > > +#define ADUX1020_PROX_INT_ENABLE 0x00f0 > > +#define ADUX1020_PROX_ON1_INT BIT(0) > > +#define ADUX1020_PROX_OFF1_INT BIT(1) > > +#define ADUX1020_FIFO_INT_ENABLE 0x7f > > +#define ADUX1020_MODE_INT_DISABLE 0xff > > +#define ADUX1020_MODE_INT_STATUS_MASK GENMASK(7, 0) > > +#define ADUX1020_FIFO_STATUS_MASK GENMASK(15, 8) > > +#define ADUX1020_PROX_TYPE BIT(15) > > + > > +#define ADUX1020_INT_PROX_ON1 BIT(0) > > +#define ADUX1020_INT_PROX_OFF1 BIT(1) > > + > > +#define ADUX1020_FORCE_CLOCK_ON 0x0f4f > > +#define ADUX1020_FORCE_CLOCK_RESET 0x0040 > > +#define ADUX1020_ACTIVE_4_STATE 0x0008 > > + > > +#define ADUX1020_PROX_FREQ_MASK GENMASK(7, 4) > > +#define ADUX1020_PROX_FREQ_SHIFT 4 > > + > > +#define ADUX1020_LED_CURRENT_MASK GENMASK(3, 0) > > +#define ADUX1020_LED_PIREF_EN BIT(12) > > + > > +/* Operating modes */ > > +enum adux1020_op_modes { > > + ADUX1020_MODE_STANDBY, > > + ADUX1020_MODE_PROX_I, > > + ADUX1020_MODE_PROX_XY, > > + ADUX1020_MODE_GEST, > > + ADUX1020_MODE_SAMPLE, > > + ADUX1020_MODE_FORCE = 0x0e, > > + ADUX1020_MODE_IDLE = 0x0f, > > +}; > > + > > +struct adux1020_data { > > + struct i2c_client *client; > > + struct iio_dev *indio_dev; > > + struct mutex lock; > > + struct regmap *regmap; > > +}; > > + > > +struct adux1020_mode_data { > > + u8 bytes; > > + u8 buf_len; > > + u16 int_en; > > +}; > > + > > +static const struct adux1020_mode_data adux1020_modes[] = { > > + [ADUX1020_MODE_PROX_I] = { > > + .bytes = 2, > > + .buf_len = 1, > > + .int_en = ADUX1020_PROX_INT_ENABLE, > > + }, > > +}; > > + > > +static const struct regmap_config adux1020_regmap_config = { > > + .name = ADUX1020_REGMAP_NAME, > > + .reg_bits = 8, > > + .val_bits = 16, > > + .max_register = 0x6F, > > + .cache_type = REGCACHE_NONE, > > +}; > > + > > +static const int adux1020_def_conf[][2] = { > > + { 0x000c, 0x000f }, > > + { 0x0010, 0x1010 }, > > + { 0x0011, 0x004c }, > > + { 0x0012, 0x5f0c }, > > + { 0x0013, 0xada5 }, > > + { 0x0014, 0x0080 }, > > + { 0x0015, 0x0000 }, > > + { 0x0016, 0x0600 }, > > + { 0x0017, 0x0000 }, > > + { 0x0018, 0x2693 }, > > + { 0x0019, 0x0004 }, > > + { 0x001a, 0x4280 }, > > + { 0x001b, 0x0060 }, > > + { 0x001c, 0x2094 }, > > + { 0x001d, 0x0020 }, > > + { 0x001e, 0x0001 }, > > + { 0x001f, 0x0100 }, > > + { 0x0020, 0x0320 }, > > + { 0x0021, 0x0A13 }, > > + { 0x0022, 0x0320 }, > > + { 0x0023, 0x0113 }, > > + { 0x0024, 0x0000 }, > > + { 0x0025, 0x2412 }, > > + { 0x0026, 0x2412 }, > > + { 0x0027, 0x0022 }, > > + { 0x0028, 0x0000 }, > > + { 0x0029, 0x0300 }, > > + { 0x002a, 0x0700 }, > > + { 0x002b, 0x0600 }, > > + { 0x002c, 0x6000 }, > > + { 0x002d, 0x4000 }, > > + { 0x002e, 0x0000 }, > > + { 0x002f, 0x0000 }, > > + { 0x0030, 0x0000 }, > > + { 0x0031, 0x0000 }, > > + { 0x0032, 0x0040 }, > > + { 0x0033, 0x0008 }, > > + { 0x0034, 0xE400 }, > > + { 0x0038, 0x8080 }, > > + { 0x0039, 0x8080 }, > > + { 0x003a, 0x2000 }, > > + { 0x003b, 0x1f00 }, > > + { 0x003c, 0x2000 }, > > + { 0x003d, 0x2000 }, > > + { 0x003e, 0x0000 }, > > + { 0x0040, 0x8069 }, > > + { 0x0041, 0x1f2f }, > > + { 0x0042, 0x4000 }, > > + { 0x0043, 0x0000 }, > > + { 0x0044, 0x0008 }, > > + { 0x0046, 0x0000 }, > > + { 0x0048, 0x00ef }, > > + { 0x0049, 0x0000 }, > > + { 0x0045, 0x0000 }, > > +}; > > + > > +static const int adux1020_rate[][2] = { > > + { 0, 100000 }, > > + { 0, 200000 }, > > + { 0, 500000 }, > > + { 1, 0 }, > > + { 2, 0 }, > > + { 5, 0 }, > > + { 10, 0 }, > > + { 20, 0 }, > > + { 50, 0 }, > > + { 100, 0 }, > > + { 190, 0 }, > > + { 450, 0 }, > > + { 820, 0 }, > > + { 1400, 0 }, > > +}; > > + > > +static const int adux1020_led_current[][2] = { > > + { 0, 25000 }, > > + { 0, 40000 }, > > + { 0, 55000 }, > > + { 0, 70000 }, > > + { 0, 85000 }, > > + { 0, 100000 }, > > + { 0, 115000 }, > > + { 0, 130000 }, > > + { 0, 145000 }, > > + { 0, 160000 }, > > + { 0, 175000 }, > > + { 0, 190000 }, > > + { 0, 205000 }, > > + { 0, 220000 }, > > + { 0, 235000 }, > > + { 0, 250000 }, > > +}; > > + > > +static void adux1020_flush_fifo(struct adux1020_data *data) > > +{ > > + /* Force Idle mode */ > > + regmap_write(data->regmap, ADUX1020_REG_FORCE_MODE, > > + ADUX1020_ACTIVE_4_STATE); > > + regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, > > + ADUX1020_OP_MODE_MASK, ADUX1020_MODE_FORCE); > > + regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, > > + ADUX1020_OP_MODE_MASK, ADUX1020_MODE_IDLE); > > + > > + /* Flush FIFO */ > > + regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, > > + ADUX1020_FORCE_CLOCK_ON); > > + regmap_write(data->regmap, ADUX1020_REG_INT_STATUS, > > + ADUX1020_FIFO_FLUSH); > > + regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, > > + ADUX1020_FORCE_CLOCK_RESET); > > +} > > + > > +static int adux1020_read_fifo(struct adux1020_data *data, u16 *buf, u8 buf_len) > > +{ > > + int i, ret = -EINVAL; > > + unsigned int regval; > > + > > + /* Enable 32MHz clock */ > > + regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, > > + ADUX1020_FORCE_CLOCK_ON); > > + > > + for (i = 0; i < buf_len; i++) { > > + ret = regmap_read(data->regmap, ADUX1020_REG_DATA_BUFFER, > > + ®val); > > + if (ret < 0) > > + goto err_out; > > + > > + buf[i] = regval; > > + } > > + > > + /* Set 32MHz clock to be controlled by internal state machine */ > > + regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, > > + ADUX1020_FORCE_CLOCK_RESET); > > + > > +err_out: > > + return ret; > > +} > > + > > +static void adux1020_set_mode(struct adux1020_data *data, > > + enum adux1020_op_modes mode) > > +{ > > + /* Switch to standby mode before changing the mode */ > > + regmap_write(data->regmap, ADUX1020_REG_OP_MODE, ADUX1020_MODE_STANDBY); > > + > > + /* Set data out and switch to the desired mode */ > > + if (mode == ADUX1020_MODE_PROX_I) { > > + regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, > > + ADUX1020_DATA_OUT_MODE_MASK, > > + ADUX1020_MODE_OUT_PROX_I << ADUX1020_MODE_OUT_SHIFT); > > + regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, > > + ADUX1020_OP_MODE_MASK, ADUX1020_MODE_PROX_I); > > + } > > +} > > + > > +static int adux1020_measure(struct adux1020_data *data, > > + enum adux1020_op_modes mode, > > + u16 *val) > > +{ > > + int ret, tries = 50; > > + unsigned int status; > > + > > + mutex_lock(&data->lock); > > + > > + /* Disable INT pin as polling is going to be used */ > > + regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE, > > + ADUX1020_INT_DISABLE); > Error checking. Yes, will add error check to regmap_ APIs wherever required. > > + > > + /* Enable mode interrupt */ > > + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, > > + ADUX1020_MODE_INT_MASK, > > + adux1020_modes[mode].int_en); > > + > > + while (tries--) { > > + ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS, > > + &status); > > + if (ret < 0) > > + goto fail; > > + > > + status &= ADUX1020_FIFO_STATUS_MASK; > > + if (status >= adux1020_modes[mode].bytes) > > + break; > > + msleep(20); > > + } > > + > > + if (tries < 0) { > > + ret = -EIO; > > + goto fail; > > + } > > + > > + ret = adux1020_read_fifo(data, val, adux1020_modes[mode].buf_len); > > + if (ret < 0) > > + goto fail; > > + > > + /* Clear mode interrupt */ > > + regmap_write(data->regmap, ADUX1020_REG_INT_STATUS, > > + (~adux1020_modes[mode].int_en)); > > + /* Disable mode interrupts */ > > + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, > > + ADUX1020_MODE_INT_MASK, ADUX1020_MODE_INT_DISABLE); > > + > > +fail: > > + mutex_unlock(&data->lock); > > + > > + return ret; > > +} > > + > > +static int adux1020_read_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, > > + int *val, int *val2, long mask) > > +{ > > + struct adux1020_data *data = iio_priv(indio_dev); > > + u16 buf[3]; > > + int ret = -EINVAL; > > + unsigned int regval; > > + > > + switch (mask) { > > + case IIO_CHAN_INFO_RAW: > > + switch (chan->type) { > > + case IIO_PROXIMITY: > > + adux1020_set_mode(data, ADUX1020_MODE_PROX_I); > > + ret = adux1020_measure(data, ADUX1020_MODE_PROX_I, buf); > > + if (ret < 0) > > + return ret; > > + > > + *val = buf[0]; > > + ret = IIO_VAL_INT; > return IIO_VAL_INT; > > + break; > > + default: > return -EINVAL; > > + break; > > + } > > + break; > > + case IIO_CHAN_INFO_PROCESSED: > > + switch (chan->type) { > > + case IIO_CURRENT: > > + ret = regmap_read(data->regmap, > > + ADUX1020_REG_LED_CURRENT, ®val); > > + if (ret < 0) > > + return ret; > > + > > + regval = regval & ADUX1020_LED_CURRENT_MASK; > > + > > + *val = adux1020_led_current[regval][0]; > > + *val2 = adux1020_led_current[regval][1]; > > + > > + ret = IIO_VAL_INT_PLUS_MICRO; > > + break; > > + default: > > + break; > > + } > > + break; > > + case IIO_CHAN_INFO_SAMP_FREQ: > > + switch (chan->type) { > > + case IIO_PROXIMITY: > > + ret = regmap_read(data->regmap, ADUX1020_REG_FREQUENCY, > > + ®val); > > + if (ret < 0) > > + return ret; > > + > > + regval = (regval & ADUX1020_PROX_FREQ_MASK) >> > > + ADUX1020_PROX_FREQ_SHIFT; > > + > > + *val = adux1020_rate[regval][0]; > > + *val2 = adux1020_rate[regval][1]; > > + > > + ret = IIO_VAL_INT_PLUS_MICRO; > > + break; > > + default: > > + break; > > + } > > + break; > > + default: > > + break; > > + } > > + > > + return ret; > > +}; > > + > > +static int adux1020_write_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *chan, > > + int val, int val2, long mask) > > +{ > > + struct adux1020_data *data = iio_priv(indio_dev); > > + int i, ret = -EINVAL; > > + > > + switch (mask) { > > + case IIO_CHAN_INFO_SAMP_FREQ: > > + if (chan->type == IIO_PROXIMITY) { > Indent is very deep. I would suggest flipping conditions a bit. > > if (chan->type != IIO_PROXIMITY) > return -EINVAL; > > for (i = 0; i < ARRAY_SIZE(adux1020_rate); i++) { > if ((val != adux1020_rate[i][0]) || > (val2 != adux1020_rate[i][1])) > continue; > return regmap_update_bits(data->regmap, > ADUX1020_REG_FREQUENCY, > ADUX1020_PROX_FREQ_MASK, > i << ADUX1020_PROX_FREQ_SHIFT); > > } > return -EINVAL; This code will be modified to use a helper for finding the index. Then it will look more cleaner. > > > + for (i = 0; i < ARRAY_SIZE(adux1020_rate); i++) { > > + if ((val == adux1020_rate[i][0]) && > > + (val2 == adux1020_rate[i][1])) { > > + ret = regmap_update_bits(data->regmap, > > + ADUX1020_REG_FREQUENCY, > > + ADUX1020_PROX_FREQ_MASK, > > + i << ADUX1020_PROX_FREQ_SHIFT); > > + } > > + } > > + } > > + break; > > direct return preferred if there is no cleanup to be done (like here). > > > + case IIO_CHAN_INFO_PROCESSED: > > + if (chan->type == IIO_CURRENT) { > > + for (i = 0; i < ARRAY_SIZE(adux1020_led_current); i++) { > > + if ((val == adux1020_led_current[i][0]) && > > + (val2 == adux1020_led_current[i][1])) { > > + ret = regmap_update_bits(data->regmap, > > + ADUX1020_REG_LED_CURRENT, > > + ADUX1020_LED_CURRENT_MASK, i); > > + } > > + } > > + } > > + break; > > + default: > > + break; > > + } > > + > > + return ret; > > +} > > + > > +static int adux1020_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 adux1020_data *data = iio_priv(indio_dev); > > + > > + regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE, > > + ADUX1020_INT_ENABLE); > > Check returns from regmap everywhere. I've had far too many dodgy > i2c buses in the past to assume they will always work! > > > + > > + regmap_write(data->regmap, ADUX1020_REG_INT_POLARITY, 0); > > + > > + switch (chan->type) { > > + case IIO_PROXIMITY: > > + if (dir == IIO_EV_DIR_RISING) { > > + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, > > + ADUX1020_PROX_ON1_INT, > > + state ? 0 : ADUX1020_PROX_ON1_INT); > > + } else { > > + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, > > + ADUX1020_PROX_OFF1_INT, > > + state ? 0 : ADUX1020_PROX_OFF1_INT); > > + } > > + > > + /* > > + * Trigger proximity interrupt when the intensity is above > > + * or below threshold > > + */ > > + regmap_update_bits(data->regmap, ADUX1020_REG_PROX_TYPE, > > + ADUX1020_PROX_TYPE, ADUX1020_PROX_TYPE); > > + > > + /* Set proximity mode */ > > + adux1020_set_mode(data, ADUX1020_MODE_PROX_I); > > + break; > > + default: > > + return -EINVAL; > > + } > > + > > + return 0; > > +} > > + > > +static int adux1020_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 adux1020_data *data = iio_priv(indio_dev); > > + int ret, mask; > > + unsigned int regval; > > + > > + switch (chan->type) { > > + case IIO_PROXIMITY: > > + if (dir == IIO_EV_DIR_RISING) > > + mask = ADUX1020_PROX_ON1_INT; > > + else > > + mask = ADUX1020_PROX_OFF1_INT; > > + break; > > + default: > > + return -EINVAL; > > + } > > + > > + ret = regmap_read(data->regmap, ADUX1020_REG_INT_MASK, ®val); > > + if (ret < 0) > > + return ret; > > + > > + return !(regval & mask); > > +} > > + > > +static int adux1020_read_thresh(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 adux1020_data *data = iio_priv(indio_dev); > > + u8 reg; > > + int ret; > > + unsigned int regval; > > + > > + switch (chan->type) { > > + case IIO_PROXIMITY: > > + if (dir == IIO_EV_DIR_RISING) > > + reg = ADUX1020_REG_PROX_TH_ON1; > > + else > > + reg = ADUX1020_REG_PROX_TH_OFF1; > > + break; > > + default: > > + return -EINVAL; > > + } > > + > > + ret = regmap_read(data->regmap, reg, ®val); > > + if (ret < 0) > > + return ret; > > + > > + *val = regval; > > + > > + return IIO_VAL_INT; > > +} > > + > > +static int adux1020_write_thresh(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 adux1020_data *data = iio_priv(indio_dev); > > + u8 reg; > > + > > + switch (chan->type) { > > + case IIO_PROXIMITY: > > + if (dir == IIO_EV_DIR_RISING) > > + reg = ADUX1020_REG_PROX_TH_ON1; > > + else > > + reg = ADUX1020_REG_PROX_TH_OFF1; > > + break; > > + default: > > + return -EINVAL; > > + } > > + > > + /* Full scale threshold value is 0-65535 */ > > + if (val < 0 || val > 65535) > > + return -EINVAL; > > + > > + return regmap_write(data->regmap, reg, val); > > +} > > + > > +static const struct iio_event_spec adux1020_proximity_event[] = { > > + { > > + .type = IIO_EV_TYPE_THRESH, > > + .dir = IIO_EV_DIR_RISING, > > + .mask_separate = BIT(IIO_EV_INFO_VALUE) | > > + BIT(IIO_EV_INFO_ENABLE), > > + }, > > + { > > + .type = IIO_EV_TYPE_THRESH, > > + .dir = IIO_EV_DIR_FALLING, > > + .mask_separate = BIT(IIO_EV_INFO_VALUE) | > > + BIT(IIO_EV_INFO_ENABLE), > > + }, > > +}; > > + > > +static const struct iio_chan_spec adux1020_channels[] = { > > + { > > + .type = IIO_PROXIMITY, > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > > + BIT(IIO_CHAN_INFO_SAMP_FREQ), > > + .event_spec = adux1020_proximity_event, > > + .num_event_specs = ARRAY_SIZE(adux1020_proximity_event), > > + }, > > + { > > + .type = IIO_CURRENT, > > + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), > > + .extend_name = "led", > > out channel? > If I add `out channel`, the sysfs naming gets wierd (out_current_led_input). Do you have a suggestion on how to represent it properly? This channel is used for getting the LED driver current and the value is in mA. > > + }, > > +}; > > + > > +static IIO_CONST_ATTR(sampling_frequency_available, > > + "0.1 0.2 0.5 1 2 5 10 20 50 100 190 450 820 1400"); > > + > > +static struct attribute *adux1020_attributes[] = { > > + &iio_const_attr_sampling_frequency_available.dev_attr.attr, > > + NULL > > +}; > > + > > +static const struct attribute_group adux1020_attribute_group = { > > + .attrs = adux1020_attributes, > > +}; > > + > > +static const struct iio_info adux1020_info = { > > + .attrs = &adux1020_attribute_group, > > + .read_raw = adux1020_read_raw, > > + .write_raw = adux1020_write_raw, > > + .read_event_config = adux1020_read_event_config, > > + .write_event_config = adux1020_write_event_config, > > + .read_event_value = adux1020_read_thresh, > > + .write_event_value = adux1020_write_thresh, > > +}; > > + > > +static irqreturn_t adux1020_interrupt_handler(int irq, void *private) > > +{ > > + struct iio_dev *indio_dev = private; > > + struct adux1020_data *data = iio_priv(indio_dev); > > + int ret, status; > > + > > + ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS, &status); > > + if (ret < 0) > > interrupt handlers have to return an irqreturn_t, so you can't just > return random error codes. > ah, yes. > > + return ret; > > + > > + status &= ADUX1020_MODE_INT_STATUS_MASK; > > + > > + if (status & ADUX1020_INT_PROX_ON1) { > > + iio_push_event(indio_dev, > > + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, > > + IIO_EV_TYPE_THRESH, > > + IIO_EV_DIR_RISING), > > + iio_get_time_ns(indio_dev)); > > + } > > + > > + if (status & ADUX1020_INT_PROX_OFF1) { > > + iio_push_event(indio_dev, > > + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, > > + IIO_EV_TYPE_THRESH, > > + IIO_EV_DIR_FALLING), > > + iio_get_time_ns(indio_dev)); > > + } > > + > > + regmap_update_bits(data->regmap, ADUX1020_REG_INT_STATUS, > > + ADUX1020_MODE_INT_MASK, status); > > + > > + return IRQ_HANDLED; > > +} > > + > > +static int adux1020_chip_init(struct adux1020_data *data) > > +{ > > + struct i2c_client *client = data->client; > > + int ret, i; > > + unsigned int val; > > + > > + ret = regmap_read(data->regmap, ADUX1020_REG_CHIP_ID, &val); > > + if (ret < 0) > > + return ret; > > + > > + val &= ADUX1020_CHIP_ID_MASK; > > + > > + if (val != ADUX1020_CHIP_ID) { > as val is only used here, > > if (val & ADUX1020_CHIP_ID_MASK != ADUX1020_CHIP_ID) { > > Saves a bit of code and isn't significantly harder to read. > okay. > > + dev_err(&client->dev, "invalid chip id 0x%04x\n", val); > > + return -ENODEV; > > + }; > > + > > + dev_dbg(&client->dev, "Detected ADUX1020 with chip id: 0x%04x\n", val); > > + > > + /* Perform software reset */ > > Try to avoid comments where the code is fairly self explanatory. > They are just potential places to diverge from reality in the future ;) > okay. > > + regmap_update_bits(data->regmap, ADUX1020_REG_SW_RESET, > > + ADUX1020_SW_RESET, ADUX1020_SW_RESET); > > This is i2c so not exactly 100% reliable (depends on good board > design etc). Hence I'd add error checking for all these reads and > writes. > > > + > > + /* Load default configuration */ > > + for (i = 0; i < ARRAY_SIZE(adux1020_def_conf); i++) > > + regmap_write(data->regmap, adux1020_def_conf[i][0], > > + adux1020_def_conf[i][1]); > > + > > + adux1020_flush_fifo(data); > > + > > + /* Use LED_IREF for proximity mode */ > > + regmap_update_bits(data->regmap, ADUX1020_REG_LED_CURRENT, > > + ADUX1020_LED_PIREF_EN, 0); > > + > > + /* Mask all interrupts */ > > + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, > > + ADUX1020_MODE_INT_MASK, ADUX1020_MODE_INT_DISABLE); > > + > > + return 0; > > +} > > + > > +static int adux1020_probe(struct i2c_client *client, > > + const struct i2c_device_id *id) > > +{ > > + struct adux1020_data *data; > > + struct iio_dev *indio_dev; > > + int ret; > > + > > + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); > > + if (!indio_dev) > > + return -ENOMEM; > > + > > + indio_dev->dev.parent = &client->dev; > > + indio_dev->info = &adux1020_info; > > + indio_dev->name = ADUX1020_DRV_NAME; > > + indio_dev->channels = adux1020_channels; > > + indio_dev->num_channels = ARRAY_SIZE(adux1020_channels); > > + indio_dev->modes = INDIO_DIRECT_MODE; > > + > > + data = iio_priv(indio_dev); > > + i2c_set_clientdata(client, indio_dev); > > + > > + data->regmap = devm_regmap_init_i2c(client, &adux1020_regmap_config); > > + if (IS_ERR(data->regmap)) { > > + dev_err(&client->dev, "regmap initialization failed.\n"); > > + return PTR_ERR(data->regmap); > > + } > > + > > + data->client = client; > > + data->indio_dev = indio_dev; > > + mutex_init(&data->lock); > > + > > + ret = adux1020_chip_init(data); > > + if (ret) > > return ret; > > > + goto err_out; > > + > > + if (client->irq) { > > + ret = devm_request_threaded_irq(&client->dev, client->irq, > > + NULL, adux1020_interrupt_handler, > > + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, > > + ADUX1020_DRV_NAME, indio_dev); > > + if (ret) { > > + dev_err(&client->dev, "irq request error %d\n", -ret); > > + goto err_out; > > Direct returns are preferred in kernel code as they are generally easier > to review. No need to check the error handling if we immediately know > there isn't any to be done! > > return ret; ack. > > + } > > + } > > + > > + ret = iio_device_register(indio_dev); > > + if (ret) { > > + dev_err(&client->dev, "Failed to register IIO device\n"); > > + goto err_out; > > This error path does no error handling so you can return directly here. > return ret; > > But... Then there is no point in having the return here as you might > as well drop it out of the brackets and replace the return 0 below with > return ret; ack. > > > + } > > + > > + return 0; > > + > > +err_out: > > + return ret; > > +} > > + > > +static int adux1020_remove(struct i2c_client *client) > > +{ > > + struct iio_dev *indio_dev = i2c_get_clientdata(client); > > + > > + iio_device_unregister(indio_dev); > If we have a remove with only iio_device_unregister it normally > implies we could have used devm_iio_device_register and allowed > the automatic unwinding to do it for us. > > Make that change and you shouldn't need a remove function at all. > In turn, there is no reason to then call i2c_set_clientdata() Sure, will use devm_ API. Thanks, Mani > > > + > > + return 0; > > +} > > + > > +static const struct i2c_device_id adux1020_id[] = { > > + { "adux1020", 0 }, > > + {} > > +}; > > +MODULE_DEVICE_TABLE(i2c, adux1020_id); > > + > > +static const struct of_device_id adux1020_of_match[] = { > > + { .compatible = "adi,adux1020" }, > > + { } > > +}; > > +MODULE_DEVICE_TABLE(of, adux1020_of_match); > > + > > +static struct i2c_driver adux1020_driver = { > > + .driver = { > > + .name = ADUX1020_DRV_NAME, > > + .of_match_table = adux1020_of_match, > > + }, > > + .probe = adux1020_probe, > > + .remove = adux1020_remove, > > + .id_table = adux1020_id, > > +}; > > +module_i2c_driver(adux1020_driver); > > + > > +MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>"); > > +MODULE_DESCRIPTION("ADUX1020 photometric sensor"); > > +MODULE_LICENSE("GPL"); > >
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index 08d7e1ef2186..3f8c8689cd89 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -32,6 +32,17 @@ config ADJD_S311 This driver can also be built as a module. If so, the module will be called adjd_s311. +config ADUX1020 + tristate "ADUX1020 photometric sensor" + select REGMAP_I2C + depends on I2C + help + Say Y here if you want to build a driver for the Analog Devices + ADUX1020 photometric sensor. + + To compile this driver as a module, choose M here: the + module will be called adux1020. + config AL3320A tristate "AL3320A ambient light sensor" depends on I2C diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile index 00d1f9b98f39..5d650ce46a40 100644 --- a/drivers/iio/light/Makefile +++ b/drivers/iio/light/Makefile @@ -6,6 +6,7 @@ # When adding new entries keep the list in alphabetical order obj-$(CONFIG_ACPI_ALS) += acpi-als.o obj-$(CONFIG_ADJD_S311) += adjd_s311.o +obj-$(CONFIG_ADUX1020) += adux1020.o obj-$(CONFIG_AL3320A) += al3320a.o obj-$(CONFIG_APDS9300) += apds9300.o obj-$(CONFIG_APDS9960) += apds9960.o diff --git a/drivers/iio/light/adux1020.c b/drivers/iio/light/adux1020.c new file mode 100644 index 000000000000..d0b76e5b44f1 --- /dev/null +++ b/drivers/iio/light/adux1020.c @@ -0,0 +1,783 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * adux1020.c - Support for Analog Devices ADUX1020 photometric sensor + * + * Copyright (C) 2019 Linaro Ltd. + * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> + * + * TODO: Triggered buffer support + */ + +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/regmap.h> + +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/events.h> + +#define ADUX1020_REGMAP_NAME "adux1020_regmap" +#define ADUX1020_DRV_NAME "adux1020" + +/* System registers */ +#define ADUX1020_REG_CHIP_ID 0x08 +#define ADUX1020_REG_SLAVE_ADDRESS 0x09 + +#define ADUX1020_REG_SW_RESET 0x0f +#define ADUX1020_REG_INT_ENABLE 0x1c +#define ADUX1020_REG_INT_POLARITY 0x1d +#define ADUX1020_REG_PROX_TH_ON1 0x2a +#define ADUX1020_REG_PROX_TH_OFF1 0x2b +#define ADUX1020_REG_PROX_TYPE 0x2f +#define ADUX1020_REG_TEST_MODES_3 0x32 +#define ADUX1020_REG_FORCE_MODE 0x33 +#define ADUX1020_REG_FREQUENCY 0x40 +#define ADUX1020_REG_LED_CURRENT 0x41 +#define ADUX1020_REG_OP_MODE 0x45 +#define ADUX1020_REG_INT_MASK 0x48 +#define ADUX1020_REG_INT_STATUS 0x49 +#define ADUX1020_REG_DATA_BUFFER 0x60 + +/* Chip ID bits */ +#define ADUX1020_CHIP_ID_MASK GENMASK(11, 0) +#define ADUX1020_CHIP_ID 0x03fc + +#define ADUX1020_MODE_OUT_SHIFT 4 +#define ADUX1020_MODE_OUT_PROX_I 1 +#define ADUX1020_MODE_OUT_PROX_XY 3 + +#define ADUX1020_SW_RESET BIT(1) +#define ADUX1020_FIFO_FLUSH BIT(15) +#define ADUX1020_OP_MODE_MASK GENMASK(3, 0) +#define ADUX1020_DATA_OUT_MODE_MASK GENMASK(7, 4) + +#define ADUX1020_MODE_INT_MASK GENMASK(7, 0) +#define ADUX1020_INT_ENABLE 0x2096 +#define ADUX1020_INT_DISABLE 0x2090 +#define ADUX1020_PROX_INT_ENABLE 0x00f0 +#define ADUX1020_PROX_ON1_INT BIT(0) +#define ADUX1020_PROX_OFF1_INT BIT(1) +#define ADUX1020_FIFO_INT_ENABLE 0x7f +#define ADUX1020_MODE_INT_DISABLE 0xff +#define ADUX1020_MODE_INT_STATUS_MASK GENMASK(7, 0) +#define ADUX1020_FIFO_STATUS_MASK GENMASK(15, 8) +#define ADUX1020_PROX_TYPE BIT(15) + +#define ADUX1020_INT_PROX_ON1 BIT(0) +#define ADUX1020_INT_PROX_OFF1 BIT(1) + +#define ADUX1020_FORCE_CLOCK_ON 0x0f4f +#define ADUX1020_FORCE_CLOCK_RESET 0x0040 +#define ADUX1020_ACTIVE_4_STATE 0x0008 + +#define ADUX1020_PROX_FREQ_MASK GENMASK(7, 4) +#define ADUX1020_PROX_FREQ_SHIFT 4 + +#define ADUX1020_LED_CURRENT_MASK GENMASK(3, 0) +#define ADUX1020_LED_PIREF_EN BIT(12) + +/* Operating modes */ +enum adux1020_op_modes { + ADUX1020_MODE_STANDBY, + ADUX1020_MODE_PROX_I, + ADUX1020_MODE_PROX_XY, + ADUX1020_MODE_GEST, + ADUX1020_MODE_SAMPLE, + ADUX1020_MODE_FORCE = 0x0e, + ADUX1020_MODE_IDLE = 0x0f, +}; + +struct adux1020_data { + struct i2c_client *client; + struct iio_dev *indio_dev; + struct mutex lock; + struct regmap *regmap; +}; + +struct adux1020_mode_data { + u8 bytes; + u8 buf_len; + u16 int_en; +}; + +static const struct adux1020_mode_data adux1020_modes[] = { + [ADUX1020_MODE_PROX_I] = { + .bytes = 2, + .buf_len = 1, + .int_en = ADUX1020_PROX_INT_ENABLE, + }, +}; + +static const struct regmap_config adux1020_regmap_config = { + .name = ADUX1020_REGMAP_NAME, + .reg_bits = 8, + .val_bits = 16, + .max_register = 0x6F, + .cache_type = REGCACHE_NONE, +}; + +static const int adux1020_def_conf[][2] = { + { 0x000c, 0x000f }, + { 0x0010, 0x1010 }, + { 0x0011, 0x004c }, + { 0x0012, 0x5f0c }, + { 0x0013, 0xada5 }, + { 0x0014, 0x0080 }, + { 0x0015, 0x0000 }, + { 0x0016, 0x0600 }, + { 0x0017, 0x0000 }, + { 0x0018, 0x2693 }, + { 0x0019, 0x0004 }, + { 0x001a, 0x4280 }, + { 0x001b, 0x0060 }, + { 0x001c, 0x2094 }, + { 0x001d, 0x0020 }, + { 0x001e, 0x0001 }, + { 0x001f, 0x0100 }, + { 0x0020, 0x0320 }, + { 0x0021, 0x0A13 }, + { 0x0022, 0x0320 }, + { 0x0023, 0x0113 }, + { 0x0024, 0x0000 }, + { 0x0025, 0x2412 }, + { 0x0026, 0x2412 }, + { 0x0027, 0x0022 }, + { 0x0028, 0x0000 }, + { 0x0029, 0x0300 }, + { 0x002a, 0x0700 }, + { 0x002b, 0x0600 }, + { 0x002c, 0x6000 }, + { 0x002d, 0x4000 }, + { 0x002e, 0x0000 }, + { 0x002f, 0x0000 }, + { 0x0030, 0x0000 }, + { 0x0031, 0x0000 }, + { 0x0032, 0x0040 }, + { 0x0033, 0x0008 }, + { 0x0034, 0xE400 }, + { 0x0038, 0x8080 }, + { 0x0039, 0x8080 }, + { 0x003a, 0x2000 }, + { 0x003b, 0x1f00 }, + { 0x003c, 0x2000 }, + { 0x003d, 0x2000 }, + { 0x003e, 0x0000 }, + { 0x0040, 0x8069 }, + { 0x0041, 0x1f2f }, + { 0x0042, 0x4000 }, + { 0x0043, 0x0000 }, + { 0x0044, 0x0008 }, + { 0x0046, 0x0000 }, + { 0x0048, 0x00ef }, + { 0x0049, 0x0000 }, + { 0x0045, 0x0000 }, +}; + +static const int adux1020_rate[][2] = { + { 0, 100000 }, + { 0, 200000 }, + { 0, 500000 }, + { 1, 0 }, + { 2, 0 }, + { 5, 0 }, + { 10, 0 }, + { 20, 0 }, + { 50, 0 }, + { 100, 0 }, + { 190, 0 }, + { 450, 0 }, + { 820, 0 }, + { 1400, 0 }, +}; + +static const int adux1020_led_current[][2] = { + { 0, 25000 }, + { 0, 40000 }, + { 0, 55000 }, + { 0, 70000 }, + { 0, 85000 }, + { 0, 100000 }, + { 0, 115000 }, + { 0, 130000 }, + { 0, 145000 }, + { 0, 160000 }, + { 0, 175000 }, + { 0, 190000 }, + { 0, 205000 }, + { 0, 220000 }, + { 0, 235000 }, + { 0, 250000 }, +}; + +static void adux1020_flush_fifo(struct adux1020_data *data) +{ + /* Force Idle mode */ + regmap_write(data->regmap, ADUX1020_REG_FORCE_MODE, + ADUX1020_ACTIVE_4_STATE); + regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, + ADUX1020_OP_MODE_MASK, ADUX1020_MODE_FORCE); + regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, + ADUX1020_OP_MODE_MASK, ADUX1020_MODE_IDLE); + + /* Flush FIFO */ + regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, + ADUX1020_FORCE_CLOCK_ON); + regmap_write(data->regmap, ADUX1020_REG_INT_STATUS, + ADUX1020_FIFO_FLUSH); + regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, + ADUX1020_FORCE_CLOCK_RESET); +} + +static int adux1020_read_fifo(struct adux1020_data *data, u16 *buf, u8 buf_len) +{ + int i, ret = -EINVAL; + unsigned int regval; + + /* Enable 32MHz clock */ + regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, + ADUX1020_FORCE_CLOCK_ON); + + for (i = 0; i < buf_len; i++) { + ret = regmap_read(data->regmap, ADUX1020_REG_DATA_BUFFER, + ®val); + if (ret < 0) + goto err_out; + + buf[i] = regval; + } + + /* Set 32MHz clock to be controlled by internal state machine */ + regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3, + ADUX1020_FORCE_CLOCK_RESET); + +err_out: + return ret; +} + +static void adux1020_set_mode(struct adux1020_data *data, + enum adux1020_op_modes mode) +{ + /* Switch to standby mode before changing the mode */ + regmap_write(data->regmap, ADUX1020_REG_OP_MODE, ADUX1020_MODE_STANDBY); + + /* Set data out and switch to the desired mode */ + if (mode == ADUX1020_MODE_PROX_I) { + regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, + ADUX1020_DATA_OUT_MODE_MASK, + ADUX1020_MODE_OUT_PROX_I << ADUX1020_MODE_OUT_SHIFT); + regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE, + ADUX1020_OP_MODE_MASK, ADUX1020_MODE_PROX_I); + } +} + +static int adux1020_measure(struct adux1020_data *data, + enum adux1020_op_modes mode, + u16 *val) +{ + int ret, tries = 50; + unsigned int status; + + mutex_lock(&data->lock); + + /* Disable INT pin as polling is going to be used */ + regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE, + ADUX1020_INT_DISABLE); + + /* Enable mode interrupt */ + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, + ADUX1020_MODE_INT_MASK, + adux1020_modes[mode].int_en); + + while (tries--) { + ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS, + &status); + if (ret < 0) + goto fail; + + status &= ADUX1020_FIFO_STATUS_MASK; + if (status >= adux1020_modes[mode].bytes) + break; + msleep(20); + } + + if (tries < 0) { + ret = -EIO; + goto fail; + } + + ret = adux1020_read_fifo(data, val, adux1020_modes[mode].buf_len); + if (ret < 0) + goto fail; + + /* Clear mode interrupt */ + regmap_write(data->regmap, ADUX1020_REG_INT_STATUS, + (~adux1020_modes[mode].int_en)); + /* Disable mode interrupts */ + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, + ADUX1020_MODE_INT_MASK, ADUX1020_MODE_INT_DISABLE); + +fail: + mutex_unlock(&data->lock); + + return ret; +} + +static int adux1020_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct adux1020_data *data = iio_priv(indio_dev); + u16 buf[3]; + int ret = -EINVAL; + unsigned int regval; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + switch (chan->type) { + case IIO_PROXIMITY: + adux1020_set_mode(data, ADUX1020_MODE_PROX_I); + ret = adux1020_measure(data, ADUX1020_MODE_PROX_I, buf); + if (ret < 0) + return ret; + + *val = buf[0]; + ret = IIO_VAL_INT; + break; + default: + break; + } + break; + case IIO_CHAN_INFO_PROCESSED: + switch (chan->type) { + case IIO_CURRENT: + ret = regmap_read(data->regmap, + ADUX1020_REG_LED_CURRENT, ®val); + if (ret < 0) + return ret; + + regval = regval & ADUX1020_LED_CURRENT_MASK; + + *val = adux1020_led_current[regval][0]; + *val2 = adux1020_led_current[regval][1]; + + ret = IIO_VAL_INT_PLUS_MICRO; + break; + default: + break; + } + break; + case IIO_CHAN_INFO_SAMP_FREQ: + switch (chan->type) { + case IIO_PROXIMITY: + ret = regmap_read(data->regmap, ADUX1020_REG_FREQUENCY, + ®val); + if (ret < 0) + return ret; + + regval = (regval & ADUX1020_PROX_FREQ_MASK) >> + ADUX1020_PROX_FREQ_SHIFT; + + *val = adux1020_rate[regval][0]; + *val2 = adux1020_rate[regval][1]; + + ret = IIO_VAL_INT_PLUS_MICRO; + break; + default: + break; + } + break; + default: + break; + } + + return ret; +}; + +static int adux1020_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct adux1020_data *data = iio_priv(indio_dev); + int i, ret = -EINVAL; + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + if (chan->type == IIO_PROXIMITY) { + for (i = 0; i < ARRAY_SIZE(adux1020_rate); i++) { + if ((val == adux1020_rate[i][0]) && + (val2 == adux1020_rate[i][1])) { + ret = regmap_update_bits(data->regmap, + ADUX1020_REG_FREQUENCY, + ADUX1020_PROX_FREQ_MASK, + i << ADUX1020_PROX_FREQ_SHIFT); + } + } + } + break; + case IIO_CHAN_INFO_PROCESSED: + if (chan->type == IIO_CURRENT) { + for (i = 0; i < ARRAY_SIZE(adux1020_led_current); i++) { + if ((val == adux1020_led_current[i][0]) && + (val2 == adux1020_led_current[i][1])) { + ret = regmap_update_bits(data->regmap, + ADUX1020_REG_LED_CURRENT, + ADUX1020_LED_CURRENT_MASK, i); + } + } + } + break; + default: + break; + } + + return ret; +} + +static int adux1020_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 adux1020_data *data = iio_priv(indio_dev); + + regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE, + ADUX1020_INT_ENABLE); + + regmap_write(data->regmap, ADUX1020_REG_INT_POLARITY, 0); + + switch (chan->type) { + case IIO_PROXIMITY: + if (dir == IIO_EV_DIR_RISING) { + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, + ADUX1020_PROX_ON1_INT, + state ? 0 : ADUX1020_PROX_ON1_INT); + } else { + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, + ADUX1020_PROX_OFF1_INT, + state ? 0 : ADUX1020_PROX_OFF1_INT); + } + + /* + * Trigger proximity interrupt when the intensity is above + * or below threshold + */ + regmap_update_bits(data->regmap, ADUX1020_REG_PROX_TYPE, + ADUX1020_PROX_TYPE, ADUX1020_PROX_TYPE); + + /* Set proximity mode */ + adux1020_set_mode(data, ADUX1020_MODE_PROX_I); + break; + default: + return -EINVAL; + } + + return 0; +} + +static int adux1020_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 adux1020_data *data = iio_priv(indio_dev); + int ret, mask; + unsigned int regval; + + switch (chan->type) { + case IIO_PROXIMITY: + if (dir == IIO_EV_DIR_RISING) + mask = ADUX1020_PROX_ON1_INT; + else + mask = ADUX1020_PROX_OFF1_INT; + break; + default: + return -EINVAL; + } + + ret = regmap_read(data->regmap, ADUX1020_REG_INT_MASK, ®val); + if (ret < 0) + return ret; + + return !(regval & mask); +} + +static int adux1020_read_thresh(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 adux1020_data *data = iio_priv(indio_dev); + u8 reg; + int ret; + unsigned int regval; + + switch (chan->type) { + case IIO_PROXIMITY: + if (dir == IIO_EV_DIR_RISING) + reg = ADUX1020_REG_PROX_TH_ON1; + else + reg = ADUX1020_REG_PROX_TH_OFF1; + break; + default: + return -EINVAL; + } + + ret = regmap_read(data->regmap, reg, ®val); + if (ret < 0) + return ret; + + *val = regval; + + return IIO_VAL_INT; +} + +static int adux1020_write_thresh(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 adux1020_data *data = iio_priv(indio_dev); + u8 reg; + + switch (chan->type) { + case IIO_PROXIMITY: + if (dir == IIO_EV_DIR_RISING) + reg = ADUX1020_REG_PROX_TH_ON1; + else + reg = ADUX1020_REG_PROX_TH_OFF1; + break; + default: + return -EINVAL; + } + + /* Full scale threshold value is 0-65535 */ + if (val < 0 || val > 65535) + return -EINVAL; + + return regmap_write(data->regmap, reg, val); +} + +static const struct iio_event_spec adux1020_proximity_event[] = { + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_RISING, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE), + }, + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_FALLING, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE), + }, +}; + +static const struct iio_chan_spec adux1020_channels[] = { + { + .type = IIO_PROXIMITY, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SAMP_FREQ), + .event_spec = adux1020_proximity_event, + .num_event_specs = ARRAY_SIZE(adux1020_proximity_event), + }, + { + .type = IIO_CURRENT, + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), + .extend_name = "led", + }, +}; + +static IIO_CONST_ATTR(sampling_frequency_available, + "0.1 0.2 0.5 1 2 5 10 20 50 100 190 450 820 1400"); + +static struct attribute *adux1020_attributes[] = { + &iio_const_attr_sampling_frequency_available.dev_attr.attr, + NULL +}; + +static const struct attribute_group adux1020_attribute_group = { + .attrs = adux1020_attributes, +}; + +static const struct iio_info adux1020_info = { + .attrs = &adux1020_attribute_group, + .read_raw = adux1020_read_raw, + .write_raw = adux1020_write_raw, + .read_event_config = adux1020_read_event_config, + .write_event_config = adux1020_write_event_config, + .read_event_value = adux1020_read_thresh, + .write_event_value = adux1020_write_thresh, +}; + +static irqreturn_t adux1020_interrupt_handler(int irq, void *private) +{ + struct iio_dev *indio_dev = private; + struct adux1020_data *data = iio_priv(indio_dev); + int ret, status; + + ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS, &status); + if (ret < 0) + return ret; + + status &= ADUX1020_MODE_INT_STATUS_MASK; + + if (status & ADUX1020_INT_PROX_ON1) { + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_RISING), + iio_get_time_ns(indio_dev)); + } + + if (status & ADUX1020_INT_PROX_OFF1) { + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_FALLING), + iio_get_time_ns(indio_dev)); + } + + regmap_update_bits(data->regmap, ADUX1020_REG_INT_STATUS, + ADUX1020_MODE_INT_MASK, status); + + return IRQ_HANDLED; +} + +static int adux1020_chip_init(struct adux1020_data *data) +{ + struct i2c_client *client = data->client; + int ret, i; + unsigned int val; + + ret = regmap_read(data->regmap, ADUX1020_REG_CHIP_ID, &val); + if (ret < 0) + return ret; + + val &= ADUX1020_CHIP_ID_MASK; + + if (val != ADUX1020_CHIP_ID) { + dev_err(&client->dev, "invalid chip id 0x%04x\n", val); + return -ENODEV; + }; + + dev_dbg(&client->dev, "Detected ADUX1020 with chip id: 0x%04x\n", val); + + /* Perform software reset */ + regmap_update_bits(data->regmap, ADUX1020_REG_SW_RESET, + ADUX1020_SW_RESET, ADUX1020_SW_RESET); + + /* Load default configuration */ + for (i = 0; i < ARRAY_SIZE(adux1020_def_conf); i++) + regmap_write(data->regmap, adux1020_def_conf[i][0], + adux1020_def_conf[i][1]); + + adux1020_flush_fifo(data); + + /* Use LED_IREF for proximity mode */ + regmap_update_bits(data->regmap, ADUX1020_REG_LED_CURRENT, + ADUX1020_LED_PIREF_EN, 0); + + /* Mask all interrupts */ + regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK, + ADUX1020_MODE_INT_MASK, ADUX1020_MODE_INT_DISABLE); + + return 0; +} + +static int adux1020_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct adux1020_data *data; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + indio_dev->dev.parent = &client->dev; + indio_dev->info = &adux1020_info; + indio_dev->name = ADUX1020_DRV_NAME; + indio_dev->channels = adux1020_channels; + indio_dev->num_channels = ARRAY_SIZE(adux1020_channels); + indio_dev->modes = INDIO_DIRECT_MODE; + + data = iio_priv(indio_dev); + i2c_set_clientdata(client, indio_dev); + + data->regmap = devm_regmap_init_i2c(client, &adux1020_regmap_config); + if (IS_ERR(data->regmap)) { + dev_err(&client->dev, "regmap initialization failed.\n"); + return PTR_ERR(data->regmap); + } + + data->client = client; + data->indio_dev = indio_dev; + mutex_init(&data->lock); + + ret = adux1020_chip_init(data); + if (ret) + goto err_out; + + if (client->irq) { + ret = devm_request_threaded_irq(&client->dev, client->irq, + NULL, adux1020_interrupt_handler, + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, + ADUX1020_DRV_NAME, indio_dev); + if (ret) { + dev_err(&client->dev, "irq request error %d\n", -ret); + goto err_out; + } + } + + ret = iio_device_register(indio_dev); + if (ret) { + dev_err(&client->dev, "Failed to register IIO device\n"); + goto err_out; + } + + return 0; + +err_out: + return ret; +} + +static int adux1020_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + + iio_device_unregister(indio_dev); + + return 0; +} + +static const struct i2c_device_id adux1020_id[] = { + { "adux1020", 0 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, adux1020_id); + +static const struct of_device_id adux1020_of_match[] = { + { .compatible = "adi,adux1020" }, + { } +}; +MODULE_DEVICE_TABLE(of, adux1020_of_match); + +static struct i2c_driver adux1020_driver = { + .driver = { + .name = ADUX1020_DRV_NAME, + .of_match_table = adux1020_of_match, + }, + .probe = adux1020_probe, + .remove = adux1020_remove, + .id_table = adux1020_id, +}; +module_i2c_driver(adux1020_driver); + +MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>"); +MODULE_DESCRIPTION("ADUX1020 photometric sensor"); +MODULE_LICENSE("GPL");
Add initial support for Analog Devices ADUX1020 Photometric sensor. Only proximity mode has been enabled for now. Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> --- drivers/iio/light/Kconfig | 11 + drivers/iio/light/Makefile | 1 + drivers/iio/light/adux1020.c | 783 +++++++++++++++++++++++++++++++++++ 3 files changed, 795 insertions(+) create mode 100644 drivers/iio/light/adux1020.c -- 2.17.1