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Message-ID: <5a7da394-2655-22f2-3bab-936ea6222dc4@kernel.org>
Date: Tue, 8 Nov 2016 20:50:32 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Brian Masney <masneyb@...tation.org>, linux-iio@...r.kernel.org
Cc: devel@...verdev.osuosl.org, gregkh@...uxfoundation.org,
lars@...afoo.de, pmeerw@...erw.net, knaack.h@....de,
linux-kernel@...r.kernel.org, Jon.Brenner@....com
Subject: Re: [PATCH v2 23/23] staging: iio: tsl2583: move out of staging
On 08/11/16 10:16, Brian Masney wrote:
> Move tsl2580, tsl2581, tsl2583 driver out of staging into mainline.
>
> Signed-off-by: Brian Masney <masneyb@...tation.org>
A few minor bits and bobs inline - might need to push one or two into relevant
earlier patches, but was easier to just review the whole code in here as
I'm out of time for tonight.
Jonathan
> ---
> .../ABI/testing/sysfs-bus-iio-light-tsl2583 | 20 +
> drivers/iio/light/Kconfig | 7 +
> drivers/iio/light/Makefile | 1 +
> drivers/iio/light/tsl2583.c | 916 +++++++++++++++++++++
> .../light/sysfs-bus-iio-light-tsl2583 | 20 -
> drivers/staging/iio/light/Kconfig | 7 -
> drivers/staging/iio/light/Makefile | 1 -
> drivers/staging/iio/light/tsl2583.c | 916 ---------------------
> 8 files changed, 944 insertions(+), 944 deletions(-)
> create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-light-tsl2583
> create mode 100644 drivers/iio/light/tsl2583.c
> delete mode 100644 drivers/staging/iio/Documentation/light/sysfs-bus-iio-light-tsl2583
> delete mode 100644 drivers/staging/iio/light/tsl2583.c
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-light-tsl2583 b/Documentation/ABI/testing/sysfs-bus-iio-light-tsl2583
> new file mode 100644
> index 0000000..a2e1996
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-iio-light-tsl2583
> @@ -0,0 +1,20 @@
> +What: /sys/bus/iio/devices/device[n]/in_illuminance_calibrate
> +KernelVersion: 2.6.37
> +Contact: linux-iio@...r.kernel.org
> +Description:
> + This property causes an internal calibration of the als gain trim
> + value which is later used in calculating illuminance in lux.
> +
> +What: /sys/bus/iio/devices/device[n]/in_illuminance_lux_table
> +KernelVersion: 2.6.37
> +Contact: linux-iio@...r.kernel.org
> +Description:
> + This property gets/sets the table of coefficients
> + used in calculating illuminance in lux.
> +
> +What: /sys/bus/iio/devices/device[n]/in_illuminance_input_target
> +KernelVersion: 2.6.37
> +Contact: linux-iio@...r.kernel.org
> +Description:
> + This property is the known externally illuminance (in lux).
> + It is used in the process of calibrating the device accuracy.
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index d011720..298ea50 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -338,6 +338,13 @@ config SENSORS_TSL2563
> This driver can also be built as a module. If so, the module
> will be called tsl2563.
>
> +config TSL2583
> + tristate "TAOS TSL2580, TSL2581 and TSL2583 light-to-digital converters"
> + depends on I2C
> + help
> + Provides support for the TAOS tsl2580, tsl2581 and tsl2583 devices.
> + Access ALS data via iio, sysfs.
> +
> config TSL4531
> tristate "TAOS TSL4531 ambient light sensors"
> depends on I2C
> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
> index 15f24c5..4de5200 100644
> --- a/drivers/iio/light/Makefile
> +++ b/drivers/iio/light/Makefile
> @@ -31,6 +31,7 @@ obj-$(CONFIG_SI1145) += si1145.o
> obj-$(CONFIG_STK3310) += stk3310.o
> obj-$(CONFIG_TCS3414) += tcs3414.o
> obj-$(CONFIG_TCS3472) += tcs3472.o
> +obj-$(CONFIG_TSL2583) += tsl2583.o
> obj-$(CONFIG_TSL4531) += tsl4531.o
> obj-$(CONFIG_US5182D) += us5182d.o
> obj-$(CONFIG_VCNL4000) += vcnl4000.o
> diff --git a/drivers/iio/light/tsl2583.c b/drivers/iio/light/tsl2583.c
> new file mode 100644
> index 0000000..5cb4ae3
> --- /dev/null
> +++ b/drivers/iio/light/tsl2583.c
> @@ -0,0 +1,916 @@
> +/*
> + * Device driver for monitoring ambient light intensity (lux)
> + * within the TAOS tsl258x family of devices (tsl2580, tsl2581).
If we are going to have a list it should be complete. tsl2583 as well.
> + *
> + * Copyright (c) 2011, TAOS Corporation.
> + * Copyright (c) 2016 Brian Masney <masneyb@...tation.org>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> + * more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/i2c.h>
> +#include <linux/errno.h>
> +#include <linux/delay.h>
> +#include <linux/string.h>
> +#include <linux/mutex.h>
> +#include <linux/unistd.h>
> +#include <linux/slab.h>
> +#include <linux/module.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +
> +/* Device Registers and Masks */
> +#define TSL2583_CNTRL 0x00
> +#define TSL2583_ALS_TIME 0X01
> +#define TSL2583_INTERRUPT 0x02
> +#define TSL2583_GAIN 0x07
> +#define TSL2583_REVID 0x11
> +#define TSL2583_CHIPID 0x12
> +#define TSL2583_ALS_CHAN0LO 0x14
> +#define TSL2583_ALS_CHAN0HI 0x15
> +#define TSL2583_ALS_CHAN1LO 0x16
> +#define TSL2583_ALS_CHAN1HI 0x17
> +#define TSL2583_TMR_LO 0x18
> +#define TSL2583_TMR_HI 0x19
> +
> +/* tsl2583 cmd reg masks */
> +#define TSL2583_CMD_REG 0x80
> +#define TSL2583_CMD_SPL_FN 0x60
> +#define TSL2583_CMD_ALS_INT_CLR 0x01
> +
> +/* tsl2583 cntrl reg masks */
> +#define TSL2583_CNTL_ADC_ENBL 0x02
> +#define TSL2583_CNTL_PWR_OFF 0x00
> +#define TSL2583_CNTL_PWR_ON 0x01
> +
> +/* tsl2583 status reg masks */
> +#define TSL2583_STA_ADC_VALID 0x01
> +#define TSL2583_STA_ADC_INTR 0x10
> +
> +/* Lux calculation constants */
> +#define TSL2583_LUX_CALC_OVER_FLOW 65535
> +
> +#define TSL2583_INTERRUPT_DISABLED 0x00
> +
> +#define TSL2583_CHIP_ID 0x90
> +#define TSL2583_CHIP_ID_MASK 0xf0
> +
> +/* Per-device data */
> +struct tsl2583_als_info {
> + u16 als_ch0;
> + u16 als_ch1;
> + u16 lux;
> +};
> +
> +struct tsl2583_lux {
> + unsigned int ratio;
> + unsigned int ch0;
> + unsigned int ch1;
> +};
> +
> +static const struct tsl2583_lux tsl2583_default_lux[] = {
> + { 9830, 8520, 15729 },
> + { 12452, 10807, 23344 },
> + { 14746, 6383, 11705 },
> + { 17695, 4063, 6554 },
> + { 0, 0, 0 } /* Termination segment */
> +};
> +
> +struct tsl2583_settings {
> + int als_time;
> + int als_gain;
> + int als_gain_trim;
> + int als_cal_target;
> +
> + /*
> + * This structure is intentionally large to accommodate updates via
> + * sysfs. Sized to 11 = max 10 segments + 1 termination segment.
> + * Assumption is that one and only one type of glass used.
> + */
> + struct tsl2583_lux als_device_lux[11];
> +};
> +
> +struct tsl2583_chip {
> + struct mutex als_mutex;
> + struct i2c_client *client;
> + struct tsl2583_als_info als_cur_info;
> + struct tsl2583_settings als_settings;
> + int als_time_scale;
> + int als_saturation;
> + bool suspended;
> +};
> +
> +struct gainadj {
> + s16 ch0;
> + s16 ch1;
> + s16 mean;
> +};
> +
> +/* Index = (0 - 3) Used to validate the gain selection index */
> +static const struct gainadj gainadj[] = {
> + { 1, 1, 1 },
> + { 8, 8, 8 },
> + { 16, 16, 16 },
> + { 107, 115, 111 }
> +};
> +
> +/*
> + * Provides initial operational parameter defaults.
> + * These defaults may be changed through the device's sysfs files.
> + */
> +static void tsl2583_defaults(struct tsl2583_chip *chip)
> +{
> + /*
> + * The integration time must be a multiple of 50ms and within the
> + * range [50, 600] ms.
> + */
> + chip->als_settings.als_time = 100;
> +
> + /*
> + * This is an index into the gainadj table. Assume clear glass as the
> + * default.
> + */
> + chip->als_settings.als_gain = 0;
> +
> + /* Default gain trim to account for aperture effects */
> + chip->als_settings.als_gain_trim = 1000;
> +
> + /* Known external ALS reading used for calibration */
> + chip->als_settings.als_cal_target = 130;
> +
> + /* Default lux table. */
> + memcpy(chip->als_settings.als_device_lux, tsl2583_default_lux,
> + sizeof(tsl2583_default_lux));
> +}
> +
> +/*
> + * Reads and calculates current lux value.
> + * The raw ch0 and ch1 values of the ambient light sensed in the last
> + * integration cycle are read from the device.
> + * Time scale factor array values are adjusted based on the integration time.
> + * The raw values are multiplied by a scale factor, and device gain is obtained
> + * using gain index. Limit checks are done next, then the ratio of a multiple
> + * of ch1 value, to the ch0 value, is calculated. The array als_device_lux[]
> + * declared above is then scanned to find the first ratio value that is just
> + * above the ratio we just calculated. The ch0 and ch1 multiplier constants in
> + * the array are then used along with the time scale factor array values, to
> + * calculate the lux.
> + */
> +static int tsl2583_get_lux(struct iio_dev *indio_dev)
> +{
> + u16 ch0, ch1; /* separated ch0/ch1 data from device */
> + u32 lux; /* raw lux calculated from device data */
> + u64 lux64;
> + u32 ratio;
> + u8 buf[5];
> + struct tsl2583_lux *p;
> + struct tsl2583_chip *chip = iio_priv(indio_dev);
> + int i, ret;
> +
> + ret = i2c_smbus_read_byte_data(chip->client, TSL2583_CMD_REG);
> + if (ret < 0) {
> + dev_err(&chip->client->dev, "%s failed to read CMD_REG register\n",
> + __func__);
> + goto done;
> + }
> +
> + /* is data new & valid */
> + if (!(ret & TSL2583_STA_ADC_INTR)) {
> + dev_err(&chip->client->dev, "%s: data not valid; returning last value\n",
> + __func__);
> + ret = chip->als_cur_info.lux; /* return LAST VALUE */
> + goto done;
> + }
> +
> + for (i = 0; i < 4; i++) {
> + int reg = TSL2583_CMD_REG | (TSL2583_ALS_CHAN0LO + i);
> +
> + ret = i2c_smbus_read_byte_data(chip->client, reg);
> + if (ret < 0) {
> + dev_err(&chip->client->dev, "%s failed to read register %x\n",
> + __func__, reg);
> + goto done;
> + }
> + buf[i] = ret;
> + }
> +
> + /*
> + * clear status, really interrupt status (interrupts are off), but
> + * we use the bit anyway - don't forget 0x80 - this is a command
? Feel free to figure out which bits of that are actually useful and delete
the rest ;)
> + */
> + ret = i2c_smbus_write_byte(chip->client,
> + (TSL2583_CMD_REG | TSL2583_CMD_SPL_FN |
> + TSL2583_CMD_ALS_INT_CLR));
> + if (ret < 0) {
> + dev_err(&chip->client->dev, "%s failed to clear the interrupt bit\n",
> + __func__);
> + goto done; /* have no data, so return failure */
> + }
> +
> + /* extract ALS/lux data */
> + ch0 = le16_to_cpup((const __le16 *)&buf[0]);
> + ch1 = le16_to_cpup((const __le16 *)&buf[2]);
> +
> + chip->als_cur_info.als_ch0 = ch0;
> + chip->als_cur_info.als_ch1 = ch1;
> +
> + if ((ch0 >= chip->als_saturation) || (ch1 >= chip->als_saturation))
> + goto return_max;
> +
> + if (!ch0) {
> + /* have no data, so return 0 */
> + ret = 0;
> + chip->als_cur_info.lux = 0;
> + goto done;
> + }
> +
> + /* calculate ratio */
> + ratio = (ch1 << 15) / ch0;
> +
> + /* convert to unscaled lux using the pointer to the table */
> + for (p = (struct tsl2583_lux *)chip->als_settings.als_device_lux;
> + p->ratio != 0 && p->ratio < ratio; p++)
> + ;
> +
> + if (p->ratio == 0) {
> + lux = 0;
> + } else {
> + u32 ch0lux, ch1lux;
> +
> + ch0lux = ((ch0 * p->ch0) +
> + (gainadj[chip->als_settings.als_gain].ch0 >> 1))
> + / gainadj[chip->als_settings.als_gain].ch0;
> + ch1lux = ((ch1 * p->ch1) +
> + (gainadj[chip->als_settings.als_gain].ch1 >> 1))
> + / gainadj[chip->als_settings.als_gain].ch1;
> +
> + /* note: lux is 31 bit max at this point */
> + if (ch1lux > ch0lux) {
> + dev_dbg(&chip->client->dev, "%s: No Data - Returning 0\n",
> + __func__);
> + ret = 0;
> + chip->als_cur_info.lux = 0;
> + goto done;
> + }
> +
> + lux = ch0lux - ch1lux;
> + }
> +
> + /* adjust for active time scale */
> + if (chip->als_time_scale == 0)
> + lux = 0;
> + else
> + lux = (lux + (chip->als_time_scale >> 1)) /
> + chip->als_time_scale;
> +
> + /*
> + * Adjust for active gain scale.
> + * The tsl2583_default_lux tables above have a factor of 8192 built in,
> + * so we need to shift right.
> + * User-specified gain provides a multiplier.
> + * Apply user-specified gain before shifting right to retain precision.
> + * Use 64 bits to avoid overflow on multiplication.
> + * Then go back to 32 bits before division to avoid using div_u64().
> + */
> + lux64 = lux;
> + lux64 = lux64 * chip->als_settings.als_gain_trim;
> + lux64 >>= 13;
> + lux = lux64;
> + lux = (lux + 500) / 1000;
> +
> + if (lux > TSL2583_LUX_CALC_OVER_FLOW) { /* check for overflow */
> +return_max:
> + lux = TSL2583_LUX_CALC_OVER_FLOW;
> + }
> +
> + /* Update the structure with the latest VALID lux. */
> + chip->als_cur_info.lux = lux;
> + ret = lux;
> +
> +done:
> + return ret;
> +}
> +
> +/*
> + * Obtain single reading and calculate the als_gain_trim (later used
> + * to derive actual lux).
> + * Return updated gain_trim value.
> + */
> +static int tsl2583_als_calibrate(struct iio_dev *indio_dev)
> +{
> + struct tsl2583_chip *chip = iio_priv(indio_dev);
> + unsigned int gain_trim_val;
> + int ret;
> + int lux_val;
> +
> + ret = i2c_smbus_read_byte_data(chip->client,
> + TSL2583_CMD_REG | TSL2583_CNTRL);
> + if (ret < 0) {
> + dev_err(&chip->client->dev,
> + "%s failed to read from the CNTRL register\n",
> + __func__);
> + return ret;
> + }
> +
> + if ((ret & (TSL2583_CNTL_ADC_ENBL | TSL2583_CNTL_PWR_ON))
> + != (TSL2583_CNTL_ADC_ENBL | TSL2583_CNTL_PWR_ON)) {
> + dev_err(&chip->client->dev,
> + "%s failed: device not powered on with ADC enabled\n",
The negative is confusing in this error.
Device not powered on and / or ADC not enabled (I think)
> + __func__);
> + return -EINVAL;
> + } else if ((ret & TSL2583_STA_ADC_VALID) != TSL2583_STA_ADC_VALID) {
> + dev_err(&chip->client->dev,
> + "%s failed: STATUS - ADC not valid.\n", __func__);
ADC reading or ADC not in valid state?
> + return -ENODATA;
> + }
> +
> + lux_val = tsl2583_get_lux(indio_dev);
> + if (lux_val < 0) {
> + dev_err(&chip->client->dev, "%s failed to get lux\n", __func__);
> + return lux_val;
> + }
> +
> + gain_trim_val = (unsigned int)(((chip->als_settings.als_cal_target)
> + * chip->als_settings.als_gain_trim) / lux_val);
> + if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {
> + dev_err(&chip->client->dev,
> + "%s failed: trim_val of %d is not within the range [250, 4000]\n",
> + __func__, gain_trim_val);
> + return -ENODATA;
> + }
> +
> + chip->als_settings.als_gain_trim = (int)gain_trim_val;
> +
> + return 0;
> +}
> +
> +static int tsl2583_set_als_time(struct tsl2583_chip *chip)
> +{
> + int als_count, als_time, ret;
> + u8 val;
> +
> + /* determine als integration register */
> + als_count = (chip->als_settings.als_time * 100 + 135) / 270;
> + if (!als_count)
> + als_count = 1; /* ensure at least one cycle */
> +
> + /* convert back to time (encompasses overrides) */
> + als_time = (als_count * 27 + 5) / 10;
> +
> + val = 256 - als_count;
> + ret = i2c_smbus_write_byte_data(chip->client,
> + TSL2583_CMD_REG | TSL2583_ALS_TIME,
> + val);
> + if (ret < 0) {
> + dev_err(&chip->client->dev, "%s failed to set the als time to %d\n",
> + __func__, val);
> + return ret;
> + }
> +
> + /* set chip struct re scaling and saturation */
> + chip->als_saturation = als_count * 922; /* 90% of full scale */
> + chip->als_time_scale = (als_time + 25) / 50;
> +
> + return ret;
> +}
> +
> +static int tsl2583_set_als_gain(struct tsl2583_chip *chip)
> +{
> + int ret;
> +
> + /* Set the gain based on als_settings struct */
> + ret = i2c_smbus_write_byte_data(chip->client,
> + TSL2583_CMD_REG | TSL2583_GAIN,
> + chip->als_settings.als_gain);
> + if (ret < 0)
> + dev_err(&chip->client->dev, "%s failed to set the gain to %d\n",
> + __func__, chip->als_settings.als_gain);
> +
> + return ret;
> +}
> +
> +static int tsl2583_set_power_state(struct tsl2583_chip *chip, u8 state)
> +{
> + int ret;
> +
> + ret = i2c_smbus_write_byte_data(chip->client,
> + TSL2583_CMD_REG | TSL2583_CNTRL, state);
> + if (ret < 0)
> + dev_err(&chip->client->dev, "%s failed to set the power state to %d\n",
> + __func__, state);
> +
> + return ret;
> +}
> +
> +/*
> + * Turn the device on.
> + * Configuration must be set before calling this function.
> + */
> +static int tsl2583_chip_init_and_power_on(struct iio_dev *indio_dev)
> +{
> + struct tsl2583_chip *chip = iio_priv(indio_dev);
> + int ret;
> +
> + /* Power on the device; ADC off. */
> + ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_ON);
> + if (ret < 0)
> + return ret;
> +
> + ret = i2c_smbus_write_byte_data(chip->client,
> + TSL2583_CMD_REG | TSL2583_INTERRUPT,
> + TSL2583_INTERRUPT_DISABLED);
> + if (ret < 0) {
> + dev_err(&chip->client->dev, "%s failed to disable interrupts\n",
> + __func__);
> + return ret;
> + }
> +
> + ret = tsl2583_set_als_time(chip);
> + if (ret < 0)
> + return ret;
> +
> + ret = tsl2583_set_als_gain(chip);
> + if (ret < 0)
> + return ret;
> +
> + usleep_range(3000, 3500);
> +
> + ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_ON |
> + TSL2583_CNTL_ADC_ENBL);
> + if (ret < 0)
> + return ret;
> +
> + chip->suspended = false;
> +
> + return ret;
> +}
> +
> +/* Sysfs Interface Functions */
> +
> +static ssize_t in_illuminance_input_target_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + struct tsl2583_chip *chip = iio_priv(indio_dev);
> + int ret;
> +
> + mutex_lock(&chip->als_mutex);
> + ret = sprintf(buf, "%d\n", chip->als_settings.als_cal_target);
> + mutex_unlock(&chip->als_mutex);
> +
> + return ret;
> +}
> +
> +static ssize_t in_illuminance_input_target_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 tsl2583_chip *chip = iio_priv(indio_dev);
> + int value;
> +
> + if (kstrtoint(buf, 0, &value) || !value)
> + return -EINVAL;
> +
> + mutex_lock(&chip->als_mutex);
> + chip->als_settings.als_cal_target = value;
> + mutex_unlock(&chip->als_mutex);
> +
> + return len;
> +}
> +
> +static ssize_t in_illuminance_calibrate_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 tsl2583_chip *chip = iio_priv(indio_dev);
> + int value, ret;
> +
> + if (kstrtoint(buf, 0, &value) || value != 1)
> + return -EINVAL;
> +
> + mutex_lock(&chip->als_mutex);
> +
> + if (chip->suspended) {
> + ret = -EBUSY;
> + goto done;
> + }
> +
> + ret = tsl2583_als_calibrate(indio_dev);
> + if (ret < 0)
> + goto done;
> +
> + ret = len;
> +done:
> + mutex_unlock(&chip->als_mutex);
> +
> + return ret;
> +}
> +
> +static ssize_t in_illuminance_lux_table_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + struct tsl2583_chip *chip = iio_priv(indio_dev);
> + unsigned int i;
> + int offset = 0;
> +
> + for (i = 0; i < ARRAY_SIZE(chip->als_settings.als_device_lux); i++) {
> + offset += sprintf(buf + offset, "%u,%u,%u,",
> + chip->als_settings.als_device_lux[i].ratio,
> + chip->als_settings.als_device_lux[i].ch0,
> + chip->als_settings.als_device_lux[i].ch1);
> + if (chip->als_settings.als_device_lux[i].ratio == 0) {
> + /*
> + * We just printed the first "0" entry.
> + * Now get rid of the extra "," and break.
> + */
> + offset--;
> + break;
> + }
> + }
> +
> + offset += sprintf(buf + offset, "\n");
> +
> + return offset;
> +}
> +
> +static ssize_t in_illuminance_lux_table_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 tsl2583_chip *chip = iio_priv(indio_dev);
> + const unsigned int max_ints =
> + ARRAY_SIZE(chip->als_settings.als_device_lux) * 3;
> + int value[max_ints];
> + int ret = -EINVAL;
> + unsigned int n;
> +
> + mutex_lock(&chip->als_mutex);
> +
> + get_options(buf, ARRAY_SIZE(value), value);
> +
> + /*
> + * We now have an array of ints starting at value[1], and
> + * enumerated by value[0].
> + * We expect each group of three ints is one table entry,
> + * and the last table entry is all 0.
> + */
> + n = value[0];
> + if ((n % 3) || n < 6 || n > max_ints) {
> + dev_err(dev,
> + "%s: The number of entries in the lux table must be a multiple of 3 and within the range [6, %d]",
> + __func__, max_ints);
> + goto done;
> + }
> + if ((value[n - 2] | value[n - 1] | value[n]) != 0) {
> + dev_err(dev, "%s: The last 3 entries in the lux table must be zeros.\n",
> + __func__);
> + goto done;
> + }
> +
> + /* Zero out the table */
> + memset(chip->als_settings.als_device_lux, 0,
> + sizeof(chip->als_settings.als_device_lux));
Would be more elegant to just zero the remaining entries after the memcpy.
Doesn't really matter though ;)
> + memcpy(chip->als_settings.als_device_lux, &value[1],
> + value[0] * sizeof(unsigned int));
> +
> + ret = len;
> +
> +done:
> + mutex_unlock(&chip->als_mutex);
> +
> + return ret;
> +}
> +
> +static IIO_CONST_ATTR(in_illuminance_calibscale_available, "1 8 16 111");
> +static IIO_CONST_ATTR(in_illuminance_integration_time_available,
> + "0.000050 0.000100 0.000150 0.000200 0.000250 0.000300 0.000350 0.000400 0.000450 0.000500 0.000550 0.000600 0.000650");
> +static IIO_DEVICE_ATTR_RW(in_illuminance_input_target, 0);
> +static IIO_DEVICE_ATTR_WO(in_illuminance_calibrate, 0);
> +static IIO_DEVICE_ATTR_RW(in_illuminance_lux_table, 0);
> +
> +static struct attribute *sysfs_attrs_ctrl[] = {
> + &iio_const_attr_in_illuminance_calibscale_available.dev_attr.attr,
> + &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
> + &iio_dev_attr_in_illuminance_input_target.dev_attr.attr,
> + &iio_dev_attr_in_illuminance_calibrate.dev_attr.attr,
> + &iio_dev_attr_in_illuminance_lux_table.dev_attr.attr,
> + NULL
> +};
> +
> +static const struct attribute_group tsl2583_attribute_group = {
> + .attrs = sysfs_attrs_ctrl,
> +};
> +
> +static const struct iio_chan_spec tsl2583_channels[] = {
> + {
> + .type = IIO_LIGHT,
> + .modified = 1,
> + .channel2 = IIO_MOD_LIGHT_IR,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> + },
> + {
> + .type = IIO_LIGHT,
> + .modified = 1,
> + .channel2 = IIO_MOD_LIGHT_BOTH,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> + },
> + {
> + .type = IIO_LIGHT,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
> + BIT(IIO_CHAN_INFO_CALIBBIAS) |
> + BIT(IIO_CHAN_INFO_CALIBSCALE) |
> + BIT(IIO_CHAN_INFO_INT_TIME),
> + },
> +};
> +
> +static int tsl2583_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + struct tsl2583_chip *chip = iio_priv(indio_dev);
> + int ret = -EINVAL;
> +
> + mutex_lock(&chip->als_mutex);
> +
> + if (chip->suspended) {
> + ret = -EBUSY;
> + goto read_done;
> + }
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + if (chan->type == IIO_LIGHT) {
> + ret = tsl2583_get_lux(indio_dev);
> + if (ret < 0)
> + goto read_done;
> +
> + /*
> + * From page 20 of the TSL2581, TSL2583 data
> + * sheet (TAOS134 − MARCH 2011):
> + *
> + * One of the photodiodes (channel 0) is
> + * sensitive to both visible and infrared light,
> + * while the second photodiode (channel 1) is
> + * sensitive primarily to infrared light.
> + */
> + if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
> + *val = chip->als_cur_info.als_ch0;
> + else
> + *val = chip->als_cur_info.als_ch1;
> +
> + ret = IIO_VAL_INT;
> + }
> + break;
> + case IIO_CHAN_INFO_PROCESSED:
> + if (chan->type == IIO_LIGHT) {
> + ret = tsl2583_get_lux(indio_dev);
> + if (ret < 0)
> + goto read_done;
> +
> + *val = ret;
> + ret = IIO_VAL_INT;
> + }
> + break;
> + case IIO_CHAN_INFO_CALIBBIAS:
> + if (chan->type == IIO_LIGHT) {
> + *val = chip->als_settings.als_gain_trim;
> + ret = IIO_VAL_INT;
> + }
> + break;
> + case IIO_CHAN_INFO_CALIBSCALE:
> + if (chan->type == IIO_LIGHT) {
> + *val = gainadj[chip->als_settings.als_gain].mean;
> + ret = IIO_VAL_INT;
> + }
> + break;
> + case IIO_CHAN_INFO_INT_TIME:
> + if (chan->type == IIO_LIGHT) {
> + *val = 0;
> + *val2 = chip->als_settings.als_time;
> + ret = IIO_VAL_INT_PLUS_MICRO;
> + }
> + break;
> + default:
> + break;
> + }
> +
> +read_done:
> + mutex_unlock(&chip->als_mutex);
> +
> + return ret;
> +}
> +
> +static int tsl2583_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val, int val2, long mask)
> +{
> + struct tsl2583_chip *chip = iio_priv(indio_dev);
> + int ret = -EINVAL;
> +
> + mutex_lock(&chip->als_mutex);
> +
> + if (chip->suspended) {
> + ret = -EBUSY;
> + goto write_done;
> + }
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_CALIBBIAS:
> + if (chan->type == IIO_LIGHT) {
> + chip->als_settings.als_gain_trim = val;
> + ret = 0;
> + }
> + break;
> + case IIO_CHAN_INFO_CALIBSCALE:
> + if (chan->type == IIO_LIGHT) {
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(gainadj); i++) {
> + if (gainadj[i].mean == val) {
> + chip->als_settings.als_gain = i;
> + ret = tsl2583_set_als_gain(chip);
> + break;
> + }
> + }
> + }
> + break;
> + case IIO_CHAN_INFO_INT_TIME:
> + if (chan->type == IIO_LIGHT && !val && val2 >= 50 &&
> + val2 <= 650 && !(val2 % 50)) {
> + chip->als_settings.als_time = val2;
> + ret = tsl2583_set_als_time(chip);
> + }
> + break;
> + default:
> + break;
> + }
> +
> +write_done:
> + mutex_unlock(&chip->als_mutex);
> +
> + return ret;
> +}
> +
> +static const struct iio_info tsl2583_info = {
> + .attrs = &tsl2583_attribute_group,
> + .driver_module = THIS_MODULE,
> + .read_raw = tsl2583_read_raw,
> + .write_raw = tsl2583_write_raw,
> +};
> +
> +/*
> + * Client probe function - When a valid device is found, the driver's device
> + * data structure is updated, and initialization completes successfully.
> + */
Can't honestly say this comment adds anything. Maybe I'm being fussy ;)
> +static int tsl2583_probe(struct i2c_client *clientp,
> + const struct i2c_device_id *idp)
> +{
> + int ret;
> + struct tsl2583_chip *chip;
> + struct iio_dev *indio_dev;
> +
> + if (!i2c_check_functionality(clientp->adapter,
> + I2C_FUNC_SMBUS_BYTE_DATA)) {
> + dev_err(&clientp->dev, "%s: i2c smbus byte data functionality is unsupported\n",
> + __func__);
> + return -EOPNOTSUPP;
> + }
> +
> + indio_dev = devm_iio_device_alloc(&clientp->dev, sizeof(*chip));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + chip = iio_priv(indio_dev);
> + chip->client = clientp;
> + i2c_set_clientdata(clientp, indio_dev);
> +
> + mutex_init(&chip->als_mutex);
> + chip->suspended = true;
> +
> + ret = i2c_smbus_read_byte_data(clientp,
> + TSL2583_CMD_REG | TSL2583_CHIPID);
> + if (ret < 0) {
> + dev_err(&clientp->dev,
> + "%s failed to read the chip ID register\n", __func__);
> + return ret;
> + }
> +
> + if ((ret & TSL2583_CHIP_ID_MASK) != TSL2583_CHIP_ID) {
> + dev_err(&clientp->dev, "%s received an unknown chip ID %x\n",
> + __func__, ret);
> + return -EINVAL;
> + }
> +
> + indio_dev->info = &tsl2583_info;
> + indio_dev->channels = tsl2583_channels;
> + indio_dev->num_channels = ARRAY_SIZE(tsl2583_channels);
> + indio_dev->dev.parent = &clientp->dev;
> + indio_dev->modes = INDIO_DIRECT_MODE;
> + indio_dev->name = chip->client->name;
> +
> + ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
> + if (ret) {
> + dev_err(&clientp->dev, "%s: iio registration failed\n",
> + __func__);
> + return ret;
> + }
> +
> + /* Load up the V2 defaults (these are hard coded defaults for now) */
> + tsl2583_defaults(chip);
> +
> + /* Make sure the chip is on */
> + ret = tsl2583_chip_init_and_power_on(indio_dev);
> + if (ret < 0)
> + return ret;
> +
> + dev_info(&clientp->dev, "Light sensor found.\n");
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int tsl2583_suspend(struct device *dev)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> + struct tsl2583_chip *chip = iio_priv(indio_dev);
> + int ret = 0;
Why is this being initialized?
> +
> + mutex_lock(&chip->als_mutex);
> +
> + ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_OFF);
> + chip->suspended = true;
> +
> + mutex_unlock(&chip->als_mutex);
blank line here would be nice.
> + return ret;
> +}
> +
> +static int tsl2583_resume(struct device *dev)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> + struct tsl2583_chip *chip = iio_priv(indio_dev);
> + int ret = 0;
or this one...
> +
> + mutex_lock(&chip->als_mutex);
> +
> + ret = tsl2583_chip_init_and_power_on(indio_dev);
> +
> + mutex_unlock(&chip->als_mutex);
and here.
> + return ret;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(tsl2583_pm_ops, tsl2583_suspend, tsl2583_resume);
> +#define TAOS_PM_OPS (&tsl2583_pm_ops)
> +#else
> +#define TAOS_PM_OPS NULL
> +#endif
> +
> +static struct i2c_device_id tsl2583_idtable[] = {
> + { "tsl2580", 0 },
> + { "tsl2581", 1 },
> + { "tsl2583", 2 },
> + {}
> +};
> +MODULE_DEVICE_TABLE(i2c, tsl2583_idtable);
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id taos2583_of_match[] = {
> + { .compatible = "amstaos,tsl2580", },
> + { .compatible = "amstaos,tsl2581", },
> + { .compatible = "amstaos,tsl2583", },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, taos2583_of_match);
> +#else
> +#define taos2583_of_match NULL
> +#endif
> +
> +/* Driver definition */
> +static struct i2c_driver tsl2583_driver = {
> + .driver = {
> + .name = "tsl2583",
> + .pm = TAOS_PM_OPS,
> + .of_match_table = taos2583_of_match,
> + },
> + .id_table = tsl2583_idtable,
> + .probe = tsl2583_probe,
> +};
> +module_i2c_driver(tsl2583_driver);
> +
> +MODULE_AUTHOR("J. August Brenner <jbrenner@...sinc.com> and Brian Masney <masneyb@...tation.org>");
> +MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/staging/iio/Documentation/light/sysfs-bus-iio-light-tsl2583 b/drivers/staging/iio/Documentation/light/sysfs-bus-iio-light-tsl2583
> deleted file mode 100644
> index a2e1996..0000000
> --- a/drivers/staging/iio/Documentation/light/sysfs-bus-iio-light-tsl2583
> +++ /dev/null
> @@ -1,20 +0,0 @@
> -What: /sys/bus/iio/devices/device[n]/in_illuminance_calibrate
> -KernelVersion: 2.6.37
> -Contact: linux-iio@...r.kernel.org
> -Description:
> - This property causes an internal calibration of the als gain trim
> - value which is later used in calculating illuminance in lux.
> -
> -What: /sys/bus/iio/devices/device[n]/in_illuminance_lux_table
> -KernelVersion: 2.6.37
> -Contact: linux-iio@...r.kernel.org
> -Description:
> - This property gets/sets the table of coefficients
> - used in calculating illuminance in lux.
> -
> -What: /sys/bus/iio/devices/device[n]/in_illuminance_input_target
> -KernelVersion: 2.6.37
> -Contact: linux-iio@...r.kernel.org
> -Description:
> - This property is the known externally illuminance (in lux).
> - It is used in the process of calibrating the device accuracy.
> diff --git a/drivers/staging/iio/light/Kconfig b/drivers/staging/iio/light/Kconfig
> index dbf22d3..4fbf629 100644
> --- a/drivers/staging/iio/light/Kconfig
> +++ b/drivers/staging/iio/light/Kconfig
> @@ -13,13 +13,6 @@ config SENSORS_ISL29028
> Proximity value via iio. The ISL29028 provides the concurrent sensing
> of ambient light and proximity.
>
> -config TSL2583
> - tristate "TAOS TSL2580, TSL2581 and TSL2583 light-to-digital converters"
> - depends on I2C
> - help
> - Provides support for the TAOS tsl2580, tsl2581 and tsl2583 devices.
> - Access ALS data via iio, sysfs.
> -
> config TSL2x7x
> tristate "TAOS TSL/TMD2x71 and TSL/TMD2x72 Family of light and proximity sensors"
> depends on I2C
> diff --git a/drivers/staging/iio/light/Makefile b/drivers/staging/iio/light/Makefile
> index 6480856..f8693e9 100644
> --- a/drivers/staging/iio/light/Makefile
> +++ b/drivers/staging/iio/light/Makefile
> @@ -3,5 +3,4 @@
> #
>
> obj-$(CONFIG_SENSORS_ISL29028) += isl29028.o
> -obj-$(CONFIG_TSL2583) += tsl2583.o
> obj-$(CONFIG_TSL2x7x) += tsl2x7x_core.o
> diff --git a/drivers/staging/iio/light/tsl2583.c b/drivers/staging/iio/light/tsl2583.c
> deleted file mode 100644
> index 5cb4ae3..0000000
> --- a/drivers/staging/iio/light/tsl2583.c
> +++ /dev/null
> @@ -1,916 +0,0 @@
> -/*
> - * Device driver for monitoring ambient light intensity (lux)
> - * within the TAOS tsl258x family of devices (tsl2580, tsl2581).
> - *
> - * Copyright (c) 2011, TAOS Corporation.
> - * Copyright (c) 2016 Brian Masney <masneyb@...tation.org>
> - *
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License as published by
> - * the Free Software Foundation; either version 2 of the License, or
> - * (at your option) any later version.
> - *
> - * This program is distributed in the hope that it will be useful, but WITHOUT
> - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> - * more details.
> - */
> -
> -#include <linux/kernel.h>
> -#include <linux/i2c.h>
> -#include <linux/errno.h>
> -#include <linux/delay.h>
> -#include <linux/string.h>
> -#include <linux/mutex.h>
> -#include <linux/unistd.h>
> -#include <linux/slab.h>
> -#include <linux/module.h>
> -#include <linux/iio/iio.h>
> -#include <linux/iio/sysfs.h>
> -
> -/* Device Registers and Masks */
> -#define TSL2583_CNTRL 0x00
> -#define TSL2583_ALS_TIME 0X01
> -#define TSL2583_INTERRUPT 0x02
> -#define TSL2583_GAIN 0x07
> -#define TSL2583_REVID 0x11
> -#define TSL2583_CHIPID 0x12
> -#define TSL2583_ALS_CHAN0LO 0x14
> -#define TSL2583_ALS_CHAN0HI 0x15
> -#define TSL2583_ALS_CHAN1LO 0x16
> -#define TSL2583_ALS_CHAN1HI 0x17
> -#define TSL2583_TMR_LO 0x18
> -#define TSL2583_TMR_HI 0x19
> -
> -/* tsl2583 cmd reg masks */
> -#define TSL2583_CMD_REG 0x80
> -#define TSL2583_CMD_SPL_FN 0x60
> -#define TSL2583_CMD_ALS_INT_CLR 0x01
> -
> -/* tsl2583 cntrl reg masks */
> -#define TSL2583_CNTL_ADC_ENBL 0x02
> -#define TSL2583_CNTL_PWR_OFF 0x00
> -#define TSL2583_CNTL_PWR_ON 0x01
> -
> -/* tsl2583 status reg masks */
> -#define TSL2583_STA_ADC_VALID 0x01
> -#define TSL2583_STA_ADC_INTR 0x10
> -
> -/* Lux calculation constants */
> -#define TSL2583_LUX_CALC_OVER_FLOW 65535
> -
> -#define TSL2583_INTERRUPT_DISABLED 0x00
> -
> -#define TSL2583_CHIP_ID 0x90
> -#define TSL2583_CHIP_ID_MASK 0xf0
> -
> -/* Per-device data */
> -struct tsl2583_als_info {
> - u16 als_ch0;
> - u16 als_ch1;
> - u16 lux;
> -};
> -
> -struct tsl2583_lux {
> - unsigned int ratio;
> - unsigned int ch0;
> - unsigned int ch1;
> -};
> -
> -static const struct tsl2583_lux tsl2583_default_lux[] = {
> - { 9830, 8520, 15729 },
> - { 12452, 10807, 23344 },
> - { 14746, 6383, 11705 },
> - { 17695, 4063, 6554 },
> - { 0, 0, 0 } /* Termination segment */
> -};
> -
> -struct tsl2583_settings {
> - int als_time;
> - int als_gain;
> - int als_gain_trim;
> - int als_cal_target;
> -
> - /*
> - * This structure is intentionally large to accommodate updates via
> - * sysfs. Sized to 11 = max 10 segments + 1 termination segment.
> - * Assumption is that one and only one type of glass used.
> - */
> - struct tsl2583_lux als_device_lux[11];
> -};
> -
> -struct tsl2583_chip {
> - struct mutex als_mutex;
> - struct i2c_client *client;
> - struct tsl2583_als_info als_cur_info;
> - struct tsl2583_settings als_settings;
> - int als_time_scale;
> - int als_saturation;
> - bool suspended;
> -};
> -
> -struct gainadj {
> - s16 ch0;
> - s16 ch1;
> - s16 mean;
> -};
> -
> -/* Index = (0 - 3) Used to validate the gain selection index */
> -static const struct gainadj gainadj[] = {
> - { 1, 1, 1 },
> - { 8, 8, 8 },
> - { 16, 16, 16 },
> - { 107, 115, 111 }
> -};
> -
> -/*
> - * Provides initial operational parameter defaults.
> - * These defaults may be changed through the device's sysfs files.
> - */
> -static void tsl2583_defaults(struct tsl2583_chip *chip)
> -{
> - /*
> - * The integration time must be a multiple of 50ms and within the
> - * range [50, 600] ms.
> - */
> - chip->als_settings.als_time = 100;
> -
> - /*
> - * This is an index into the gainadj table. Assume clear glass as the
> - * default.
> - */
> - chip->als_settings.als_gain = 0;
> -
> - /* Default gain trim to account for aperture effects */
> - chip->als_settings.als_gain_trim = 1000;
> -
> - /* Known external ALS reading used for calibration */
> - chip->als_settings.als_cal_target = 130;
> -
> - /* Default lux table. */
> - memcpy(chip->als_settings.als_device_lux, tsl2583_default_lux,
> - sizeof(tsl2583_default_lux));
> -}
> -
> -/*
> - * Reads and calculates current lux value.
> - * The raw ch0 and ch1 values of the ambient light sensed in the last
> - * integration cycle are read from the device.
> - * Time scale factor array values are adjusted based on the integration time.
> - * The raw values are multiplied by a scale factor, and device gain is obtained
> - * using gain index. Limit checks are done next, then the ratio of a multiple
> - * of ch1 value, to the ch0 value, is calculated. The array als_device_lux[]
> - * declared above is then scanned to find the first ratio value that is just
> - * above the ratio we just calculated. The ch0 and ch1 multiplier constants in
> - * the array are then used along with the time scale factor array values, to
> - * calculate the lux.
> - */
> -static int tsl2583_get_lux(struct iio_dev *indio_dev)
> -{
> - u16 ch0, ch1; /* separated ch0/ch1 data from device */
> - u32 lux; /* raw lux calculated from device data */
> - u64 lux64;
> - u32 ratio;
> - u8 buf[5];
> - struct tsl2583_lux *p;
> - struct tsl2583_chip *chip = iio_priv(indio_dev);
> - int i, ret;
> -
> - ret = i2c_smbus_read_byte_data(chip->client, TSL2583_CMD_REG);
> - if (ret < 0) {
> - dev_err(&chip->client->dev, "%s failed to read CMD_REG register\n",
> - __func__);
> - goto done;
> - }
> -
> - /* is data new & valid */
> - if (!(ret & TSL2583_STA_ADC_INTR)) {
> - dev_err(&chip->client->dev, "%s: data not valid; returning last value\n",
> - __func__);
> - ret = chip->als_cur_info.lux; /* return LAST VALUE */
> - goto done;
> - }
> -
> - for (i = 0; i < 4; i++) {
> - int reg = TSL2583_CMD_REG | (TSL2583_ALS_CHAN0LO + i);
> -
> - ret = i2c_smbus_read_byte_data(chip->client, reg);
> - if (ret < 0) {
> - dev_err(&chip->client->dev, "%s failed to read register %x\n",
> - __func__, reg);
> - goto done;
> - }
> - buf[i] = ret;
> - }
> -
> - /*
> - * clear status, really interrupt status (interrupts are off), but
> - * we use the bit anyway - don't forget 0x80 - this is a command
> - */
> - ret = i2c_smbus_write_byte(chip->client,
> - (TSL2583_CMD_REG | TSL2583_CMD_SPL_FN |
> - TSL2583_CMD_ALS_INT_CLR));
> - if (ret < 0) {
> - dev_err(&chip->client->dev, "%s failed to clear the interrupt bit\n",
> - __func__);
> - goto done; /* have no data, so return failure */
> - }
> -
> - /* extract ALS/lux data */
> - ch0 = le16_to_cpup((const __le16 *)&buf[0]);
> - ch1 = le16_to_cpup((const __le16 *)&buf[2]);
> -
> - chip->als_cur_info.als_ch0 = ch0;
> - chip->als_cur_info.als_ch1 = ch1;
> -
> - if ((ch0 >= chip->als_saturation) || (ch1 >= chip->als_saturation))
> - goto return_max;
> -
> - if (!ch0) {
> - /* have no data, so return 0 */
> - ret = 0;
> - chip->als_cur_info.lux = 0;
> - goto done;
> - }
> -
> - /* calculate ratio */
> - ratio = (ch1 << 15) / ch0;
> -
> - /* convert to unscaled lux using the pointer to the table */
> - for (p = (struct tsl2583_lux *)chip->als_settings.als_device_lux;
> - p->ratio != 0 && p->ratio < ratio; p++)
> - ;
> -
> - if (p->ratio == 0) {
> - lux = 0;
> - } else {
> - u32 ch0lux, ch1lux;
> -
> - ch0lux = ((ch0 * p->ch0) +
> - (gainadj[chip->als_settings.als_gain].ch0 >> 1))
> - / gainadj[chip->als_settings.als_gain].ch0;
> - ch1lux = ((ch1 * p->ch1) +
> - (gainadj[chip->als_settings.als_gain].ch1 >> 1))
> - / gainadj[chip->als_settings.als_gain].ch1;
> -
> - /* note: lux is 31 bit max at this point */
> - if (ch1lux > ch0lux) {
> - dev_dbg(&chip->client->dev, "%s: No Data - Returning 0\n",
> - __func__);
> - ret = 0;
> - chip->als_cur_info.lux = 0;
> - goto done;
> - }
> -
> - lux = ch0lux - ch1lux;
> - }
> -
> - /* adjust for active time scale */
> - if (chip->als_time_scale == 0)
> - lux = 0;
> - else
> - lux = (lux + (chip->als_time_scale >> 1)) /
> - chip->als_time_scale;
> -
> - /*
> - * Adjust for active gain scale.
> - * The tsl2583_default_lux tables above have a factor of 8192 built in,
> - * so we need to shift right.
> - * User-specified gain provides a multiplier.
> - * Apply user-specified gain before shifting right to retain precision.
> - * Use 64 bits to avoid overflow on multiplication.
> - * Then go back to 32 bits before division to avoid using div_u64().
> - */
> - lux64 = lux;
> - lux64 = lux64 * chip->als_settings.als_gain_trim;
> - lux64 >>= 13;
> - lux = lux64;
> - lux = (lux + 500) / 1000;
> -
> - if (lux > TSL2583_LUX_CALC_OVER_FLOW) { /* check for overflow */
> -return_max:
> - lux = TSL2583_LUX_CALC_OVER_FLOW;
> - }
> -
> - /* Update the structure with the latest VALID lux. */
> - chip->als_cur_info.lux = lux;
> - ret = lux;
> -
> -done:
> - return ret;
> -}
> -
> -/*
> - * Obtain single reading and calculate the als_gain_trim (later used
> - * to derive actual lux).
> - * Return updated gain_trim value.
> - */
> -static int tsl2583_als_calibrate(struct iio_dev *indio_dev)
> -{
> - struct tsl2583_chip *chip = iio_priv(indio_dev);
> - unsigned int gain_trim_val;
> - int ret;
> - int lux_val;
> -
> - ret = i2c_smbus_read_byte_data(chip->client,
> - TSL2583_CMD_REG | TSL2583_CNTRL);
> - if (ret < 0) {
> - dev_err(&chip->client->dev,
> - "%s failed to read from the CNTRL register\n",
> - __func__);
> - return ret;
> - }
> -
> - if ((ret & (TSL2583_CNTL_ADC_ENBL | TSL2583_CNTL_PWR_ON))
> - != (TSL2583_CNTL_ADC_ENBL | TSL2583_CNTL_PWR_ON)) {
> - dev_err(&chip->client->dev,
> - "%s failed: device not powered on with ADC enabled\n",
> - __func__);
> - return -EINVAL;
> - } else if ((ret & TSL2583_STA_ADC_VALID) != TSL2583_STA_ADC_VALID) {
> - dev_err(&chip->client->dev,
> - "%s failed: STATUS - ADC not valid.\n", __func__);
> - return -ENODATA;
> - }
> -
> - lux_val = tsl2583_get_lux(indio_dev);
> - if (lux_val < 0) {
> - dev_err(&chip->client->dev, "%s failed to get lux\n", __func__);
> - return lux_val;
> - }
> -
> - gain_trim_val = (unsigned int)(((chip->als_settings.als_cal_target)
> - * chip->als_settings.als_gain_trim) / lux_val);
> - if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {
> - dev_err(&chip->client->dev,
> - "%s failed: trim_val of %d is not within the range [250, 4000]\n",
> - __func__, gain_trim_val);
> - return -ENODATA;
> - }
> -
> - chip->als_settings.als_gain_trim = (int)gain_trim_val;
> -
> - return 0;
> -}
> -
> -static int tsl2583_set_als_time(struct tsl2583_chip *chip)
> -{
> - int als_count, als_time, ret;
> - u8 val;
> -
> - /* determine als integration register */
> - als_count = (chip->als_settings.als_time * 100 + 135) / 270;
> - if (!als_count)
> - als_count = 1; /* ensure at least one cycle */
> -
> - /* convert back to time (encompasses overrides) */
> - als_time = (als_count * 27 + 5) / 10;
> -
> - val = 256 - als_count;
> - ret = i2c_smbus_write_byte_data(chip->client,
> - TSL2583_CMD_REG | TSL2583_ALS_TIME,
> - val);
> - if (ret < 0) {
> - dev_err(&chip->client->dev, "%s failed to set the als time to %d\n",
> - __func__, val);
> - return ret;
> - }
> -
> - /* set chip struct re scaling and saturation */
> - chip->als_saturation = als_count * 922; /* 90% of full scale */
> - chip->als_time_scale = (als_time + 25) / 50;
> -
> - return ret;
> -}
> -
> -static int tsl2583_set_als_gain(struct tsl2583_chip *chip)
> -{
> - int ret;
> -
> - /* Set the gain based on als_settings struct */
> - ret = i2c_smbus_write_byte_data(chip->client,
> - TSL2583_CMD_REG | TSL2583_GAIN,
> - chip->als_settings.als_gain);
> - if (ret < 0)
> - dev_err(&chip->client->dev, "%s failed to set the gain to %d\n",
> - __func__, chip->als_settings.als_gain);
> -
> - return ret;
> -}
> -
> -static int tsl2583_set_power_state(struct tsl2583_chip *chip, u8 state)
> -{
> - int ret;
> -
> - ret = i2c_smbus_write_byte_data(chip->client,
> - TSL2583_CMD_REG | TSL2583_CNTRL, state);
> - if (ret < 0)
> - dev_err(&chip->client->dev, "%s failed to set the power state to %d\n",
> - __func__, state);
> -
> - return ret;
> -}
> -
> -/*
> - * Turn the device on.
> - * Configuration must be set before calling this function.
> - */
> -static int tsl2583_chip_init_and_power_on(struct iio_dev *indio_dev)
> -{
> - struct tsl2583_chip *chip = iio_priv(indio_dev);
> - int ret;
> -
> - /* Power on the device; ADC off. */
> - ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_ON);
> - if (ret < 0)
> - return ret;
> -
> - ret = i2c_smbus_write_byte_data(chip->client,
> - TSL2583_CMD_REG | TSL2583_INTERRUPT,
> - TSL2583_INTERRUPT_DISABLED);
> - if (ret < 0) {
> - dev_err(&chip->client->dev, "%s failed to disable interrupts\n",
> - __func__);
> - return ret;
> - }
> -
> - ret = tsl2583_set_als_time(chip);
> - if (ret < 0)
> - return ret;
> -
> - ret = tsl2583_set_als_gain(chip);
> - if (ret < 0)
> - return ret;
> -
> - usleep_range(3000, 3500);
> -
> - ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_ON |
> - TSL2583_CNTL_ADC_ENBL);
> - if (ret < 0)
> - return ret;
> -
> - chip->suspended = false;
> -
> - return ret;
> -}
> -
> -/* Sysfs Interface Functions */
> -
> -static ssize_t in_illuminance_input_target_show(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> -{
> - struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> - struct tsl2583_chip *chip = iio_priv(indio_dev);
> - int ret;
> -
> - mutex_lock(&chip->als_mutex);
> - ret = sprintf(buf, "%d\n", chip->als_settings.als_cal_target);
> - mutex_unlock(&chip->als_mutex);
> -
> - return ret;
> -}
> -
> -static ssize_t in_illuminance_input_target_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 tsl2583_chip *chip = iio_priv(indio_dev);
> - int value;
> -
> - if (kstrtoint(buf, 0, &value) || !value)
> - return -EINVAL;
> -
> - mutex_lock(&chip->als_mutex);
> - chip->als_settings.als_cal_target = value;
> - mutex_unlock(&chip->als_mutex);
> -
> - return len;
> -}
> -
> -static ssize_t in_illuminance_calibrate_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 tsl2583_chip *chip = iio_priv(indio_dev);
> - int value, ret;
> -
> - if (kstrtoint(buf, 0, &value) || value != 1)
> - return -EINVAL;
> -
> - mutex_lock(&chip->als_mutex);
> -
> - if (chip->suspended) {
> - ret = -EBUSY;
> - goto done;
> - }
> -
> - ret = tsl2583_als_calibrate(indio_dev);
> - if (ret < 0)
> - goto done;
> -
> - ret = len;
> -done:
> - mutex_unlock(&chip->als_mutex);
> -
> - return ret;
> -}
> -
> -static ssize_t in_illuminance_lux_table_show(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> -{
> - struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> - struct tsl2583_chip *chip = iio_priv(indio_dev);
> - unsigned int i;
> - int offset = 0;
> -
> - for (i = 0; i < ARRAY_SIZE(chip->als_settings.als_device_lux); i++) {
> - offset += sprintf(buf + offset, "%u,%u,%u,",
> - chip->als_settings.als_device_lux[i].ratio,
> - chip->als_settings.als_device_lux[i].ch0,
> - chip->als_settings.als_device_lux[i].ch1);
> - if (chip->als_settings.als_device_lux[i].ratio == 0) {
> - /*
> - * We just printed the first "0" entry.
> - * Now get rid of the extra "," and break.
> - */
> - offset--;
> - break;
> - }
> - }
> -
> - offset += sprintf(buf + offset, "\n");
> -
> - return offset;
> -}
> -
> -static ssize_t in_illuminance_lux_table_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 tsl2583_chip *chip = iio_priv(indio_dev);
> - const unsigned int max_ints =
> - ARRAY_SIZE(chip->als_settings.als_device_lux) * 3;
> - int value[max_ints];
> - int ret = -EINVAL;
> - unsigned int n;
> -
> - mutex_lock(&chip->als_mutex);
> -
> - get_options(buf, ARRAY_SIZE(value), value);
> -
> - /*
> - * We now have an array of ints starting at value[1], and
> - * enumerated by value[0].
> - * We expect each group of three ints is one table entry,
> - * and the last table entry is all 0.
> - */
> - n = value[0];
> - if ((n % 3) || n < 6 || n > max_ints) {
> - dev_err(dev,
> - "%s: The number of entries in the lux table must be a multiple of 3 and within the range [6, %d]",
> - __func__, max_ints);
> - goto done;
> - }
> - if ((value[n - 2] | value[n - 1] | value[n]) != 0) {
> - dev_err(dev, "%s: The last 3 entries in the lux table must be zeros.\n",
> - __func__);
> - goto done;
> - }
> -
> - /* Zero out the table */
> - memset(chip->als_settings.als_device_lux, 0,
> - sizeof(chip->als_settings.als_device_lux));
> - memcpy(chip->als_settings.als_device_lux, &value[1],
> - value[0] * sizeof(unsigned int));
> -
> - ret = len;
> -
> -done:
> - mutex_unlock(&chip->als_mutex);
> -
> - return ret;
> -}
> -
> -static IIO_CONST_ATTR(in_illuminance_calibscale_available, "1 8 16 111");
> -static IIO_CONST_ATTR(in_illuminance_integration_time_available,
> - "0.000050 0.000100 0.000150 0.000200 0.000250 0.000300 0.000350 0.000400 0.000450 0.000500 0.000550 0.000600 0.000650");
> -static IIO_DEVICE_ATTR_RW(in_illuminance_input_target, 0);
> -static IIO_DEVICE_ATTR_WO(in_illuminance_calibrate, 0);
> -static IIO_DEVICE_ATTR_RW(in_illuminance_lux_table, 0);
> -
> -static struct attribute *sysfs_attrs_ctrl[] = {
> - &iio_const_attr_in_illuminance_calibscale_available.dev_attr.attr,
> - &iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
> - &iio_dev_attr_in_illuminance_input_target.dev_attr.attr,
> - &iio_dev_attr_in_illuminance_calibrate.dev_attr.attr,
> - &iio_dev_attr_in_illuminance_lux_table.dev_attr.attr,
> - NULL
> -};
> -
> -static const struct attribute_group tsl2583_attribute_group = {
> - .attrs = sysfs_attrs_ctrl,
> -};
> -
> -static const struct iio_chan_spec tsl2583_channels[] = {
> - {
> - .type = IIO_LIGHT,
> - .modified = 1,
> - .channel2 = IIO_MOD_LIGHT_IR,
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> - },
> - {
> - .type = IIO_LIGHT,
> - .modified = 1,
> - .channel2 = IIO_MOD_LIGHT_BOTH,
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> - },
> - {
> - .type = IIO_LIGHT,
> - .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
> - BIT(IIO_CHAN_INFO_CALIBBIAS) |
> - BIT(IIO_CHAN_INFO_CALIBSCALE) |
> - BIT(IIO_CHAN_INFO_INT_TIME),
> - },
> -};
> -
> -static int tsl2583_read_raw(struct iio_dev *indio_dev,
> - struct iio_chan_spec const *chan,
> - int *val, int *val2, long mask)
> -{
> - struct tsl2583_chip *chip = iio_priv(indio_dev);
> - int ret = -EINVAL;
> -
> - mutex_lock(&chip->als_mutex);
> -
> - if (chip->suspended) {
> - ret = -EBUSY;
> - goto read_done;
> - }
> -
> - switch (mask) {
> - case IIO_CHAN_INFO_RAW:
> - if (chan->type == IIO_LIGHT) {
> - ret = tsl2583_get_lux(indio_dev);
> - if (ret < 0)
> - goto read_done;
> -
> - /*
> - * From page 20 of the TSL2581, TSL2583 data
> - * sheet (TAOS134 − MARCH 2011):
> - *
> - * One of the photodiodes (channel 0) is
> - * sensitive to both visible and infrared light,
> - * while the second photodiode (channel 1) is
> - * sensitive primarily to infrared light.
> - */
> - if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
> - *val = chip->als_cur_info.als_ch0;
> - else
> - *val = chip->als_cur_info.als_ch1;
> -
> - ret = IIO_VAL_INT;
> - }
> - break;
> - case IIO_CHAN_INFO_PROCESSED:
> - if (chan->type == IIO_LIGHT) {
> - ret = tsl2583_get_lux(indio_dev);
> - if (ret < 0)
> - goto read_done;
> -
> - *val = ret;
> - ret = IIO_VAL_INT;
> - }
> - break;
> - case IIO_CHAN_INFO_CALIBBIAS:
> - if (chan->type == IIO_LIGHT) {
> - *val = chip->als_settings.als_gain_trim;
> - ret = IIO_VAL_INT;
> - }
> - break;
> - case IIO_CHAN_INFO_CALIBSCALE:
> - if (chan->type == IIO_LIGHT) {
> - *val = gainadj[chip->als_settings.als_gain].mean;
> - ret = IIO_VAL_INT;
> - }
> - break;
> - case IIO_CHAN_INFO_INT_TIME:
> - if (chan->type == IIO_LIGHT) {
> - *val = 0;
> - *val2 = chip->als_settings.als_time;
> - ret = IIO_VAL_INT_PLUS_MICRO;
> - }
> - break;
> - default:
> - break;
> - }
> -
> -read_done:
> - mutex_unlock(&chip->als_mutex);
> -
> - return ret;
> -}
> -
> -static int tsl2583_write_raw(struct iio_dev *indio_dev,
> - struct iio_chan_spec const *chan,
> - int val, int val2, long mask)
> -{
> - struct tsl2583_chip *chip = iio_priv(indio_dev);
> - int ret = -EINVAL;
> -
> - mutex_lock(&chip->als_mutex);
> -
> - if (chip->suspended) {
> - ret = -EBUSY;
> - goto write_done;
> - }
> -
> - switch (mask) {
> - case IIO_CHAN_INFO_CALIBBIAS:
> - if (chan->type == IIO_LIGHT) {
> - chip->als_settings.als_gain_trim = val;
> - ret = 0;
> - }
> - break;
> - case IIO_CHAN_INFO_CALIBSCALE:
> - if (chan->type == IIO_LIGHT) {
> - unsigned int i;
> -
> - for (i = 0; i < ARRAY_SIZE(gainadj); i++) {
> - if (gainadj[i].mean == val) {
> - chip->als_settings.als_gain = i;
> - ret = tsl2583_set_als_gain(chip);
> - break;
> - }
> - }
> - }
> - break;
> - case IIO_CHAN_INFO_INT_TIME:
> - if (chan->type == IIO_LIGHT && !val && val2 >= 50 &&
> - val2 <= 650 && !(val2 % 50)) {
> - chip->als_settings.als_time = val2;
> - ret = tsl2583_set_als_time(chip);
> - }
> - break;
> - default:
> - break;
> - }
> -
> -write_done:
> - mutex_unlock(&chip->als_mutex);
> -
> - return ret;
> -}
> -
> -static const struct iio_info tsl2583_info = {
> - .attrs = &tsl2583_attribute_group,
> - .driver_module = THIS_MODULE,
> - .read_raw = tsl2583_read_raw,
> - .write_raw = tsl2583_write_raw,
> -};
> -
> -/*
> - * Client probe function - When a valid device is found, the driver's device
> - * data structure is updated, and initialization completes successfully.
> - */
> -static int tsl2583_probe(struct i2c_client *clientp,
> - const struct i2c_device_id *idp)
> -{
> - int ret;
> - struct tsl2583_chip *chip;
> - struct iio_dev *indio_dev;
> -
> - if (!i2c_check_functionality(clientp->adapter,
> - I2C_FUNC_SMBUS_BYTE_DATA)) {
> - dev_err(&clientp->dev, "%s: i2c smbus byte data functionality is unsupported\n",
> - __func__);
> - return -EOPNOTSUPP;
> - }
> -
> - indio_dev = devm_iio_device_alloc(&clientp->dev, sizeof(*chip));
> - if (!indio_dev)
> - return -ENOMEM;
> -
> - chip = iio_priv(indio_dev);
> - chip->client = clientp;
> - i2c_set_clientdata(clientp, indio_dev);
> -
> - mutex_init(&chip->als_mutex);
> - chip->suspended = true;
> -
> - ret = i2c_smbus_read_byte_data(clientp,
> - TSL2583_CMD_REG | TSL2583_CHIPID);
> - if (ret < 0) {
> - dev_err(&clientp->dev,
> - "%s failed to read the chip ID register\n", __func__);
> - return ret;
> - }
> -
> - if ((ret & TSL2583_CHIP_ID_MASK) != TSL2583_CHIP_ID) {
> - dev_err(&clientp->dev, "%s received an unknown chip ID %x\n",
> - __func__, ret);
> - return -EINVAL;
> - }
> -
> - indio_dev->info = &tsl2583_info;
> - indio_dev->channels = tsl2583_channels;
> - indio_dev->num_channels = ARRAY_SIZE(tsl2583_channels);
> - indio_dev->dev.parent = &clientp->dev;
> - indio_dev->modes = INDIO_DIRECT_MODE;
> - indio_dev->name = chip->client->name;
> -
> - ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
> - if (ret) {
> - dev_err(&clientp->dev, "%s: iio registration failed\n",
> - __func__);
> - return ret;
> - }
> -
> - /* Load up the V2 defaults (these are hard coded defaults for now) */
> - tsl2583_defaults(chip);
> -
> - /* Make sure the chip is on */
> - ret = tsl2583_chip_init_and_power_on(indio_dev);
> - if (ret < 0)
> - return ret;
> -
> - dev_info(&clientp->dev, "Light sensor found.\n");
> -
> - return 0;
> -}
> -
> -#ifdef CONFIG_PM_SLEEP
> -static int tsl2583_suspend(struct device *dev)
> -{
> - struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> - struct tsl2583_chip *chip = iio_priv(indio_dev);
> - int ret = 0;
> -
> - mutex_lock(&chip->als_mutex);
> -
> - ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_OFF);
> - chip->suspended = true;
> -
> - mutex_unlock(&chip->als_mutex);
> - return ret;
> -}
> -
> -static int tsl2583_resume(struct device *dev)
> -{
> - struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> - struct tsl2583_chip *chip = iio_priv(indio_dev);
> - int ret = 0;
> -
> - mutex_lock(&chip->als_mutex);
> -
> - ret = tsl2583_chip_init_and_power_on(indio_dev);
> -
> - mutex_unlock(&chip->als_mutex);
> - return ret;
> -}
> -
> -static SIMPLE_DEV_PM_OPS(tsl2583_pm_ops, tsl2583_suspend, tsl2583_resume);
> -#define TAOS_PM_OPS (&tsl2583_pm_ops)
> -#else
> -#define TAOS_PM_OPS NULL
> -#endif
> -
> -static struct i2c_device_id tsl2583_idtable[] = {
> - { "tsl2580", 0 },
> - { "tsl2581", 1 },
> - { "tsl2583", 2 },
> - {}
> -};
> -MODULE_DEVICE_TABLE(i2c, tsl2583_idtable);
> -
> -#ifdef CONFIG_OF
> -static const struct of_device_id taos2583_of_match[] = {
> - { .compatible = "amstaos,tsl2580", },
> - { .compatible = "amstaos,tsl2581", },
> - { .compatible = "amstaos,tsl2583", },
> - { },
> -};
> -MODULE_DEVICE_TABLE(of, taos2583_of_match);
> -#else
> -#define taos2583_of_match NULL
> -#endif
> -
> -/* Driver definition */
> -static struct i2c_driver tsl2583_driver = {
> - .driver = {
> - .name = "tsl2583",
> - .pm = TAOS_PM_OPS,
> - .of_match_table = taos2583_of_match,
> - },
> - .id_table = tsl2583_idtable,
> - .probe = tsl2583_probe,
> -};
> -module_i2c_driver(tsl2583_driver);
> -
> -MODULE_AUTHOR("J. August Brenner <jbrenner@...sinc.com> and Brian Masney <masneyb@...tation.org>");
> -MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver");
> -MODULE_LICENSE("GPL");
>
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