[PATCH v2] for TAOS tsl2571 Device driver Patch for tsl2571 driver. Driver includes (iio_event/interrupt). Corrected various functions to return proper status (vs eating status). Corrected various formatting issues. Changed term in lux calculation from 2^13 to 2^8 to accommodate updated lux table (glass coefficients). Updated default lux table (clear glass). Signed-off-by: Jon August Brenner <jbrenner@xxxxxxxxxxx> --- drivers/staging/iio/light/Kconfig | 10 + drivers/staging/iio/light/Makefile | 1 + drivers/staging/iio/light/tsl2571.c | 1362 +++++++++++++++++++++++++++++++++++ 3 files changed, 1373 insertions(+), 0 deletions(-) diff --git a/drivers/staging/iio/light/Kconfig b/drivers/staging/iio/light/Kconfig index 36d8bbe..7f9897c 100644 --- a/drivers/staging/iio/light/Kconfig +++ b/drivers/staging/iio/light/Kconfig @@ -24,3 +24,13 @@ config SENSORS_ISL29018 in lux, proximity infrared sensing and normal infrared sensing. Data from sensor is accessible via sysfs. +config SENSORS_TSL2571 + tristate "TAOS TSL2571 ambient light sensor" + depends on I2C + help + If you say yes here you get support for the TAOS TSL2571, + ambient light sensor with interrupt. + + This driver can also be built as a module. If so, the module + will be called tsl2571. + diff --git a/drivers/staging/iio/light/Makefile b/drivers/staging/iio/light/Makefile index 9142c0e..fa08012 100644 --- a/drivers/staging/iio/light/Makefile +++ b/drivers/staging/iio/light/Makefile @@ -4,3 +4,4 @@ obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o obj-$(CONFIG_SENSORS_ISL29018) += isl29018.o +obj-$(CONFIG_SENSORS_TSL2571) += tsl2571.o diff --git a/drivers/staging/iio/light/tsl2571.c b/drivers/staging/iio/light/tsl2571.c new file mode 100644 index 0000000..1c28dca --- /dev/null +++ b/drivers/staging/iio/light/tsl2571.c @@ -0,0 +1,1362 @@ +/* + * Device driver for monitoring ambient light intensity (lux) + * for the TAOS TSL257X devices (w/ interrupt iio_event functionality). + * + * Copyright (c) 2011, TAOS Corporation. + * + * 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. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +#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/interrupt.h> +#include <linux/input.h> +#include <linux/slab.h> +#include "../iio.h" +#include "../sysfs.h" + +/* 2571 register offsets */ +#define TSL257X_MAX_DEVICE_REGS 32 +#define TSL257X_REG_MAX 16 + +/* Device Registers and Masks */ +#define TSL257X_CNTRL 0x00 +#define TSL257X_ALS_TIME 0X01 + +#define TSL257X_ALS_MINTHRESHLO 0X04 +#define TSL257X_ALS_MINTHRESHHI 0X05 +#define TSL257X_ALS_MAXTHRESHLO 0X06 +#define TSL257X_ALS_MAXTHRESHHI 0X07 + +#define TSL257X_PERSISTENCE 0x0c +#define TSL257X_GAIN 0x0f +#define TSL257X_STATUS 0x13 +#define TSL257X_REVID 0x11 +#define TSL257X_CHIPID 0x12 +#define TSL257X_ALS_CHAN0LO 0x14 +#define TSL257X_ALS_CHAN0HI 0x15 +#define TSL257X_ALS_CHAN1LO 0x16 +#define TSL257X_ALS_CHAN1HI 0x17 + +/* tsl2571 cmd reg masks */ +#define TSL257X_CMD_REG 0x80 +#define TSL257X_CMD_SPL_FN 0x60 +#define TSL257X_CMD_ALS_INT_CLR 0x06 + +/* tsl2571 cntrl reg masks */ +#define TSL257X_CNTL_ADC_ENBL 0x02 +#define TSL257X_CNTL_PWR_ON 0x01 + +/* tsl2571 status reg masks */ +#define TSL257X_STA_ADC_VALID 0x01 +#define TSL257X_STA_ALS_INTR 0x10 + +/* Triton cntrl reg masks */ +#define CNTL_REG_CLEAR 0x00 +#define CNTL_PROX_INT_ENBL 0X20 +#define CNTL_ALS_INT_ENBL 0X10 +#define TSL257X_CNTL_WAIT_TMR_ENBL 0X08 +#define CNTL_PROX_DET_ENBL 0X04 +#define CNTL_ADC_ENBL 0x02 +#define TSL257X_CNTL_PWRON 0x01 +#define CNTL_ALSPON_ENBL 0x03 +#define CNTL_INTALSPON_ENBL 0x13 +#define CNTL_PROXPON_ENBL 0x0F +#define CNTL_INTPROXPON_ENBL 0x2F +#define TSL257X_CMD_PROXALS_INTCLR 0X07 + +/* Lux calculation constants */ +#define TSL257X_LUX_CALC_OVER_FLOW 65535 + +enum { + TSL257X_CHIP_UNKNOWN = 0, + TSL257X_CHIP_WORKING = 1, + TSL257X_CHIP_SUSPENDED = 2 +} TSL257X_CHIP_WORKING_STATUS; + +/* Per-device data */ +struct taos_als_info { + u16 als_ch0; + u16 als_ch1; + u16 lux; +}; + +struct taos_settings { + int als_time; + int als_gain; + int als_gain_trim; + int als_cal_target; + u8 als_interrupt; + u8 als_persistence; + int als_thresh_low; + int als_thresh_high; +}; + +static const u8 persistence_available[] = { + 0, 1, 2, 3, 5, 10, 15, 20, + 25, 30, 35, 40, 45, 50, 55, 60 +}; + +struct tsl2571_chip { + struct mutex als_mutex; + struct i2c_client *client; + struct iio_dev *iio_dev; + struct taos_als_info als_cur_info; + struct taos_settings taos_settings; + int als_time_scale; + int als_saturation; + int taos_chip_status; + u8 taos_config[TSL257X_REG_MAX]; + bool init_done; + struct work_struct work_thresh; + s64 event_timestamp; + unsigned int irq_no; +}; + +/* + * Initial values for device - this values can/will be changed by driver. + * and applications as needed. + * These values are dynamic. + */ +static u8 taos_config[] = { + 0x00, 0xee, 0x00, 0xF5, 0x03, 0x00, 0x00, 0x01, + /* Enabl atime N/A wtime ThL0 ThL1 ThH0 ThH1 */ + 0x00, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00 + /* N/A N/A N/A N/A prst wlong N/A gain */ +}; + +struct taos_lux { + unsigned int ratio; + unsigned int ch0; + unsigned int ch1; +}; + +/* This structure is intentionally large to accommodate updates via sysfs. */ +/* Sized to 11 = max 10 segments + 1 termination segment */ +/* Assumption is one and only one type of glass used */ +struct taos_lux taos_device_lux[11] = { + { 14461, 611, 1211 }, + { 18540, 352, 623 }, + { 0, 0, 0 }, +}; + +struct gainadj { + s16 ch0; + s16 ch1; +}; + +/* Used to validate the gain selection index */ +static const struct gainadj tsl2571_gainadj[] = { + { 1, 1 }, + { 8, 8 }, + { 16, 16 }, + { 120, 120 } +}; + +/* + * Read a number of bytes starting at register (reg) location. + * Return 0, or i2c_smbus_write_byte ERROR code. + */ +static int +taos_i2c_read(struct i2c_client *client, u8 reg, u8 *val, unsigned int len) +{ + int ret; + int i; + + for (i = 0; i < len; i++) { + /* select register to write */ + ret = i2c_smbus_write_byte(client, (TSL257X_CMD_REG | reg)); + if (ret < 0) { + dev_err(&client->dev, "taos_i2c_read failed to write" + " register %x\n", reg); + return ret; + } + /* read the data */ + *val = i2c_smbus_read_byte(client); + val++; + reg++; + } + return 0; +} + +/* + * 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 taos_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 taos_get_lux(struct i2c_client *client) +{ + u16 ch0, ch1; /* separated ch0/ch1 data from device */ + u32 lux; /* raw lux calculated from device data */ + u32 ratio; +#pragma pack(4) + u8 buf[4]; + + struct taos_lux *p; + struct tsl2571_chip *chip = i2c_get_clientdata(client); + int i, ret; + u32 ch0lux = 0; + u32 ch1lux = 0; + + if (mutex_trylock(&chip->als_mutex) == 0) { + dev_info(&client->dev, "taos_get_lux device is busy\n"); + return chip->als_cur_info.lux; /* busy, so return LAST VALUE */ + } + + if (chip->taos_chip_status != TSL257X_CHIP_WORKING) { + /* device is not enabled */ + dev_err(&client->dev, "taos_get_lux device is not enabled\n"); + ret = -EBUSY ; + goto out_unlock; + } + + ret = taos_i2c_read(client, (TSL257X_CMD_REG | TSL257X_STATUS), + &buf[0], 1); + if (ret < 0) { + dev_err(&client->dev, "taos_get_lux failed to read CMD_REG\n"); + goto out_unlock; + } + /* is data new & valid */ + if (!(buf[0] & TSL257X_STA_ADC_VALID)) { + dev_err(&client->dev, "taos_get_lux data not valid\n"); + ret = chip->als_cur_info.lux; /* return LAST VALUE */ + goto out_unlock; + } + + for (i = 0; i < 4; i++) { + ret = taos_i2c_read(client, + (TSL257X_CMD_REG | (TSL257X_ALS_CHAN0LO + i)), &buf[i], 1); + if (ret < 0) { + dev_err(&client->dev, "taos_get_lux failed to read" + " register %x\n", + TSL257X_CMD_REG | (TSL257X_ALS_CHAN0LO + i)); + goto out_unlock; + } + } + + /* clear status, really interrupt status (interrupts are off), but + we use the bit anyway */ + ret = i2c_smbus_write_byte(client, + (TSL257X_CMD_REG | TSL257X_CMD_SPL_FN | TSL257X_CMD_ALS_INT_CLR)); + + if (ret < 0) { + dev_err(&client->dev, + "taos_i2c_write_command failed in taos_get_lux, err = %d\n", + ret); + goto out_unlock; /* 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 == 0) { + /* have no data, so return LAST VALUE */ + ret = chip->als_cur_info.lux = 0; + goto out_unlock; + } + /* calculate ratio */ + ratio = (ch1 << 15) / ch0; + /* convert to unscaled lux using the pointer to the table */ + for (p = (struct taos_lux *) taos_device_lux; + p->ratio != 0 && p->ratio < ratio; p++) + ; + + if (p->ratio == 0) { + lux = 0; + } else { + ch0lux = ((ch0 * p->ch0) + + (tsl2571_gainadj[chip->taos_settings.als_gain].ch0 >> 1)) + / tsl2571_gainadj[chip->taos_settings.als_gain].ch0; + ch1lux = ((ch1 * p->ch1) + + (tsl2571_gainadj[chip->taos_settings.als_gain].ch1 >> 1)) + / tsl2571_gainadj[chip->taos_settings.als_gain].ch1; + lux = ch0lux - ch1lux; + } + + /* note: lux is 31 bit max at this point */ + if (ch1lux > ch0lux) { + dev_dbg(&client->dev, "No Data - Return last value\n"); + ret = chip->als_cur_info.lux = 0; + goto out_unlock; + } + + /* 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 */ + lux >>= 8; /* tables have factor of 256 built in for accuracy */ + + lux = (lux * chip->taos_settings.als_gain_trim + 500) / 1000; + + if (lux > TSL257X_LUX_CALC_OVER_FLOW) { /* check for overflow */ +return_max: + lux = TSL257X_LUX_CALC_OVER_FLOW; + } + + /* Update the structure with the latest VALID lux. */ + chip->als_cur_info.lux = lux; + ret = lux; + +out_unlock: + mutex_unlock(&chip->als_mutex); + return ret; + +} + +/* + * Ambient light transition sense interrupt BH - called when the ambient + * light falls above or below a band of ambient light. A signal is issued to + * any waiting user mode threads, and the above band is adjusted up or down? + * The ALS interrupt filter is initially set to 0x00 when ALS_ON is called, to + * force the first interrupt, after which it is set to the configured value. + */ +void taos_als_interrupt_bh(struct work_struct *als) +{ +int ret; +int i; +u8 als_int_thresh[4]; +u8 chdata[4]; +unsigned int raw_ch0, raw_ch1, cdelta; +int value; + +struct tsl2571_chip *chip + = container_of(als, + struct tsl2571_chip, work_thresh); + + value = i2c_smbus_read_byte_data(chip->client, + TSL257X_CMD_REG | TSL257X_STATUS); + + /* post the event */ + if (value & 0x10) { + iio_push_event(chip->iio_dev, 0, + IIO_UNMOD_EVENT_CODE(IIO_EV_CLASS_LIGHT, + 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_EITHER), + chip->event_timestamp); + } + + taos_get_lux(chip->client); + + /* Clear interrupt */ + ret = i2c_smbus_write_byte(chip->client, + (TSL257X_CMD_REG | TSL257X_CMD_SPL_FN | TSL257X_CMD_PROXALS_INTCLR)); + if (ret < 0) + dev_info(&chip->client->dev, + "i2c_write_command failed in taos_chip_on, err = %d\n", ret); + + /* re-adjust our upper and lower thresholds */ + raw_ch0 = chip->als_cur_info.als_ch0; + raw_ch1 = chip->als_cur_info.als_ch1; + if (raw_ch0 == 0) { + chip->taos_settings.als_thresh_low = 0; + chip->taos_settings.als_thresh_high = 1; + } else if (raw_ch0 < 10) { + chip->taos_settings.als_thresh_low = raw_ch0 - 1; + chip->taos_settings.als_thresh_high = raw_ch0; + } else { + cdelta = (raw_ch0 * 5) / 100; + chip->taos_settings.als_thresh_low = raw_ch0 - cdelta; + chip->taos_settings.als_thresh_high = raw_ch0 + cdelta; + if (chip->taos_settings.als_thresh_high > 0xFFFF) + chip->taos_settings.als_thresh_high = 0xFFFF; + } + + als_int_thresh[0] = (chip->taos_settings.als_thresh_low) & 0xFF; + als_int_thresh[1] = (chip->taos_settings.als_thresh_low >> 8) & 0xFF; + als_int_thresh[2] = (chip->taos_settings.als_thresh_high) & 0xFF; + als_int_thresh[3] = (chip->taos_settings.als_thresh_high >> 8) & 0xFF; + + for (i = 0; i < 4; i++) { + ret = i2c_smbus_write_byte_data(chip->client, + (TSL257X_CMD_REG | (TSL257X_ALS_MINTHRESHLO + i)), + als_int_thresh[i]); + if (ret < 0) { + dev_info(&chip->client->dev, + "FAILED: update the ALS LOW THRESH (B).\n"); + } + } + + if (!chip->init_done) { + /* Maintain the persistence value that was there + * if there was one */ + ret = taos_i2c_read(chip->client, + (TSL257X_CMD_REG | (TSL257X_PERSISTENCE)), + &chdata[0], 1); + if (ret < 0) + dev_info(&chip->client->dev, + "Failed to get the persistence register value\n"); + + chdata[0] = chip->taos_settings.als_persistence; + + ret = i2c_smbus_write_byte_data(chip->client, + (TSL257X_CMD_REG | TSL257X_PERSISTENCE), chdata[0]); + if (ret < 0) + dev_info(&chip->client->dev, + "FAILED: taos_i2c_write to upersistence (B).\n"); + + ret = i2c_smbus_write_byte(chip->client, + TSL257X_CMD_REG | TSL257X_CMD_SPL_FN | TSL257X_CMD_ALS_INT_CLR); + if (ret < 0) { + dev_info(&chip->client->dev, + "i2c_write failed to clear ALS irq, err = %d\n", ret); + } + + chip->init_done = 1; + } + + enable_irq(chip->irq_no); + +return; +} + +/* + * Provides initial operational parameter defaults. + * These defaults may be changed through the device's sysfs files. + */ +static void taos_defaults(struct tsl2571_chip *chip) +{ + /* Operational parameters */ + chip->taos_settings.als_time = 200; + /* must be a multiple of 50mS */ + chip->taos_settings.als_gain = 0; + /* this is actually an index into the gain table */ + /* assume clear glass as default */ + chip->taos_settings.als_gain_trim = 1000; + /* default gain trim to account for aperture effects */ + chip->taos_settings.als_cal_target = 130; + /* Known external ALS reading used for calibration */ + chip->taos_settings.als_thresh_low = 03; + /* CH0 'low' count to trigger interrupt */ + chip->taos_settings.als_thresh_high = 256; + /* CH0 'high' count to trigger interrupt */ + chip->taos_settings.als_persistence = 3; + /* Number of 'out of limits' ADC readings */ + chip->taos_settings.als_interrupt = 1; + /* Default with interrupt enabled */ +} + + +/* + * Obtain single reading and calculate the als_gain_trim (later used + * to derive actual lux). + * Return updated gain_trim value. + */ +int taos_als_calibrate(struct i2c_client *client) +{ + struct tsl2571_chip *chip = i2c_get_clientdata(client); + u8 reg_val; + unsigned int gain_trim_val; + int ret; + int lux_val; + + ret = i2c_smbus_write_byte(client, (TSL257X_CMD_REG | TSL257X_CNTRL)); + if (ret < 0) { + dev_err(&client->dev, + "taos_als_calibrate failed read CNTRL register, ret=%d\n", + ret); + return ret; + } + + reg_val = i2c_smbus_read_byte(client); + if ((reg_val & (TSL257X_CNTL_ADC_ENBL | TSL257X_CNTL_PWR_ON)) + != (TSL257X_CNTL_ADC_ENBL | TSL257X_CNTL_PWR_ON)) { + dev_err(&client->dev, + "taos_als_calibrate failed: ADC not enabled\n"); + return -1; + } + + ret = i2c_smbus_write_byte(client, (TSL257X_CMD_REG | TSL257X_CNTRL)); + if (ret < 0) { + dev_err(&client->dev, + "taos_als_calibrate failed: read STATUS, ret=%d\n", + ret); + return ret; + } + reg_val = i2c_smbus_read_byte(client); + + if ((reg_val & TSL257X_STA_ADC_VALID) != TSL257X_STA_ADC_VALID) { + dev_err(&client->dev, + "taos_als_calibrate failed: STATUS - ADC not valid.\n"); + return -EINVAL; + } + lux_val = taos_get_lux(client); + if (lux_val < 0) { + dev_err(&client->dev, "taos_als_calibrate failed to get lux\n"); + return lux_val; + } + gain_trim_val = (unsigned int) (((chip->taos_settings.als_cal_target) + * chip->taos_settings.als_gain_trim) / lux_val); + + if ((gain_trim_val < 250) || (gain_trim_val > 4000)) { + dev_err(&client->dev, + "taos_als_calibrate failed: trim_val %d - out of range\n", + gain_trim_val); + return -ERANGE; + } + chip->taos_settings.als_gain_trim = (int) gain_trim_val; + + return (int) gain_trim_val; +} + +/* + * Turn the device on. + * Configuration must be set before calling this function. + */ +static int taos_chip_on(struct i2c_client *client) +{ + int i; + int ret = 0; + u8 *uP; + u8 utmp; + int als_count; + int als_time; + struct tsl2571_chip *chip = i2c_get_clientdata(client); + u8 reg_val; + + /* Non calculated parameters */ + chip->taos_config[TSL257X_ALS_MINTHRESHLO] = + (chip->taos_settings.als_thresh_low) & 0xFF; + chip->taos_config[TSL257X_ALS_MINTHRESHHI] = + (chip->taos_settings.als_thresh_low >> 8) & 0xFF; + chip->taos_config[TSL257X_ALS_MAXTHRESHLO] = + (chip->taos_settings.als_thresh_high) & 0xFF; + chip->taos_config[TSL257X_ALS_MAXTHRESHHI] = + (chip->taos_settings.als_thresh_high >> 8) & 0xFF; + chip->taos_config[TSL257X_PERSISTENCE] = + chip->taos_settings.als_persistence; + + /* and make sure we're not already on */ + if (chip->taos_chip_status == TSL257X_CHIP_WORKING) { + dev_info(&client->dev, "device is already enabled\n"); + return -EINVAL; + } + + /* determine als integration regster */ + als_count = (chip->taos_settings.als_time * 100 + 135) / 270; + if (als_count == 0) + als_count = 1; /* ensure at least one cycle */ + + /* convert back to time (encompasses overrides) */ + als_time = (als_count * 27 + 5) / 10; + chip->taos_config[TSL257X_ALS_TIME] = 256 - als_count; + + /* Set the gain based on taos_settings struct */ + chip->taos_config[TSL257X_GAIN] = chip->taos_settings.als_gain; + + /* 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; + + /* TSL257X Specific power-on / adc enable sequence + * Power on the device 1st. */ + utmp = TSL257X_CNTL_PWR_ON; + ret = i2c_smbus_write_byte_data(client, TSL257X_CMD_REG | TSL257X_CNTRL, + utmp); + if (ret < 0) { + dev_err(&client->dev, "taos_chip_on failed on CNTRL reg.\n"); + return ret; + } + + /* Use the following shadow copy for our delay before enabling ADC. + * Write all the registers. */ + for (i = 0, uP = chip->taos_config; i < TSL257X_REG_MAX; i++) { + ret = i2c_smbus_write_byte_data(client, TSL257X_CMD_REG + i, + *uP++); + if (ret < 0) { + dev_err(&client->dev, + "taos_chip_on failed on write to reg %d.\n", i); + return ret; + } + } + + msleep(3); + /* NOW enable the ADC + * initialize the desired mode of operation */ + utmp = TSL257X_CNTL_PWR_ON | TSL257X_CNTL_ADC_ENBL; + ret = i2c_smbus_write_byte_data(client, TSL257X_CMD_REG | TSL257X_CNTRL, + utmp); + if (ret < 0) { + dev_err(&client->dev, "taos_chip_on failed on 2nd CTRL reg.\n"); + return ret; + } + + + /* If interrupts are enabled */ + chip->init_done = 0; + if (chip->taos_settings.als_interrupt) { + dev_info(&client->dev, "ALS Interrupts on\n"); + /*First make sure we have an ALS persistence > 0 + else we'll interrupt continuously.*/ + ret = taos_i2c_read(client, + (TSL257X_CMD_REG | TSL257X_PERSISTENCE), ®_val, 1); + if (ret < 0) { + dev_err(&client->dev, + "Failed to get the persistence register value\n"); + return ret; + } + + /*ALS Interrupt after 3 consecutive reading out of range */ + if ((reg_val & 0x0F) == 0) { + reg_val |= 0x03; + ret = i2c_smbus_write_byte_data(client, + (TSL257X_CMD_REG | (TSL257X_PERSISTENCE)), reg_val); + + if (ret < 0) + dev_err(&client->dev, + "taos_i2c_write to update the persistence register.\n"); + return ret; + } + reg_val = TSL257X_CNTL_PWRON | + CNTL_ADC_ENBL | + CNTL_ALS_INT_ENBL | + CNTL_INTALSPON_ENBL; + + ret = i2c_smbus_write_byte_data(client, + (TSL257X_CMD_REG | TSL257X_CNTRL), reg_val); + if (ret < 0) { + dev_err(&client->dev, + "taos_i2c_write to device failed in TAOS_IOCTL_INT_SET.\n"); + return ret; + } + + /* Clear out any initial als interrupts */ + ret = i2c_smbus_write_byte(client, + TSL257X_CMD_REG | TSL257X_CMD_SPL_FN | + TSL257X_CMD_PROXALS_INTCLR); + if (ret < 0) { + dev_err(&client->dev, + "Failed to clear interrupts: taos_chip_on\n"); + return ret; + } + } + + chip->taos_chip_status = TSL257X_CHIP_WORKING; + + return ret; + +} + +static int taos_chip_off(struct i2c_client *client) +{ + struct tsl2571_chip *chip = i2c_get_clientdata(client); + + /* turn device off */ + chip->taos_chip_status = TSL257X_CHIP_SUSPENDED; + return i2c_smbus_write_byte_data(client, + TSL257X_CMD_REG | TSL257X_CNTRL, 0x00); +} + +/* ---------- Sysfs Interface Functions ------------- */ + +static ssize_t taos_device_id(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + + return sprintf(buf, "%s\n", chip->client->name); +} + +static ssize_t taos_power_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + + return sprintf(buf, "%d\n", chip->taos_chip_status); +} + +static ssize_t taos_power_state_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + unsigned long value; + + if (strict_strtoul(buf, 0, &value)) + return -EINVAL; + + if (value == 0) + taos_chip_off(chip->client); + else + taos_chip_on(chip->client); + + return len; +} + +static ssize_t taos_gain_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + + return sprintf(buf, "%d\n", + tsl2571_gainadj[chip->taos_settings.als_gain].ch0); +} + +static ssize_t taos_gain_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + unsigned long value; + if (strict_strtoul(buf, 0, &value)) + return -EINVAL; + + switch (value) { + case 1: + chip->taos_settings.als_gain = 0; + break; + case 8: + chip->taos_settings.als_gain = 1; + break; + case 16: + chip->taos_settings.als_gain = 2; + break; + case 111: + chip->taos_settings.als_gain = 3; + break; + default: + dev_err(dev, + "Invalid Gain Index\n"); + return -EINVAL; + } + + return len; +} + +static ssize_t taos_gain_available_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%s\n", "1 8 16 111"); +} + +static ssize_t taos_als_time_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + + return sprintf(buf, "%d\n", chip->taos_settings.als_time); +} + +static ssize_t taos_als_time_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + unsigned long value; + + if (strict_strtoul(buf, 0, &value)) + return -EINVAL; + + if ((value < 50) || (value > 650)) + return -EINVAL; + + if (value % 50) + return -EINVAL; + + chip->taos_settings.als_time = value; + + return len; +} + +static ssize_t taos_als_time_available_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%s\n", + "50 100 150 200 250 300 350 400 450 500 550 600 650"); +} + +static ssize_t taos_als_trim_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + + return sprintf(buf, "%d\n", chip->taos_settings.als_gain_trim); +} + +static ssize_t taos_als_trim_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + unsigned long value; + + if (strict_strtoul(buf, 0, &value)) + return -EINVAL; + + if (value) + chip->taos_settings.als_gain_trim = value; + + return len; +} + +static ssize_t taos_adc_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + int lux; + + lux = taos_get_lux(chip->client); + + return sprintf(buf, "%d,%d\n", + chip->als_cur_info.als_ch0, chip->als_cur_info.als_ch1); +} + +static ssize_t taos_als_cal_target_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + + return sprintf(buf, "%d\n", chip->taos_settings.als_cal_target); +} + +static ssize_t taos_als_cal_target_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + unsigned long value; + + if (strict_strtoul(buf, 0, &value)) + return -EINVAL; + + if (value) + chip->taos_settings.als_cal_target = value; + + return len; +} + +static ssize_t taos_als_interrupt_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + + return sprintf(buf, "%d\n", chip->taos_settings.als_interrupt); +} + +static ssize_t taos_als_interrupt_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + unsigned long value; + + if (strict_strtoul(buf, 0, &value)) + return -EINVAL; + + if (value > 1) + return -EINVAL; + chip->taos_settings.als_interrupt = value; + + return len; +} + +static ssize_t taos_als_thresh_low_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + + return sprintf(buf, "%d\n", chip->taos_settings.als_thresh_low); +} + +static ssize_t taos_als_thresh_low_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + unsigned long value; + + if (strict_strtoul(buf, 0, &value)) + return -EINVAL; + + chip->taos_settings.als_thresh_low = value; + + return len; +} + +static ssize_t taos_als_thresh_high_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + + return sprintf(buf, "%d\n", chip->taos_settings.als_thresh_high); +} + +static ssize_t taos_als_thresh_high_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + unsigned long value; + + if (strict_strtoul(buf, 0, &value)) + return -EINVAL; + + chip->taos_settings.als_thresh_high = value; + + return len; +} + +/* sampling_frequency AKA persistence in data sheet */ +static ssize_t taos_als_persistence_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + + return sprintf(buf, "%d\n", + persistence_available[chip->taos_settings.als_persistence]); +} + +static ssize_t taos_als_persistence_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + int i; + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + unsigned long value; + + if (strict_strtoul(buf, 0, &value)) + return -EINVAL; + + for (i = 0; i < (sizeof(persistence_available) + 1); i++) { + if ((u8)value == persistence_available[i]) { + chip->taos_settings.als_persistence = i; + return len; + } + } + + dev_err(dev, + "Invalid Persistence value\n"); + return -EINVAL; +} + +static ssize_t taos_als_persistence_available_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "0 1 2 3 5 10 15 20 25 30 35 40 45 5 55 60\n"); +} + +static ssize_t taos_lux_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + int lux; + + lux = taos_get_lux(chip->client); + + return sprintf(buf, "%d\n", lux); +} + +static ssize_t taos_do_calibrate(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + unsigned long value; + + if (strict_strtoul(buf, 0, &value)) + return -EINVAL; + + if (value == 1) + taos_als_calibrate(chip->client); + + return len; +} + +static ssize_t taos_luxtable_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int i; + int offset = 0; + + for (i = 0; i < ARRAY_SIZE(taos_device_lux); i++) { + offset += sprintf(buf + offset, "%d,%d,%d,", + taos_device_lux[i].ratio, + taos_device_lux[i].ch0, + taos_device_lux[i].ch1); + if (taos_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 taos_luxtable_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl2571_chip *chip = indio_dev->dev_data; + int value[ARRAY_SIZE(taos_device_lux)]; + int n; + + 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 > ((ARRAY_SIZE(taos_device_lux) - 1) * 3)) { + dev_info(dev, "LUX TABLE INPUT ERROR 1 Value[0]=%d\n", n); + return -EINVAL; + } + + if ((value[(n - 2)] | value[(n - 1)] | value[n]) != 0) { + dev_info(dev, "LUX TABLE INPUT ERROR 2 Value[0]=%d\n", n); + return -EINVAL; + } + + if (chip->taos_chip_status == TSL257X_CHIP_WORKING) + taos_chip_off(chip->client); + + /* Zero out the table */ + memset(taos_device_lux, 0, sizeof(taos_device_lux)); + memcpy(taos_device_lux, &value[1], (value[0] * 4)); + + taos_chip_on(chip->client); + + return len; +} + + +static DEVICE_ATTR(name, S_IRUGO, taos_device_id, NULL); +static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, + taos_power_state_show, taos_power_state_store); + +static DEVICE_ATTR(illuminance0_calibscale, S_IRUGO | S_IWUSR, + taos_gain_show, taos_gain_store); +static DEVICE_ATTR(illuminance0_calibscale_available, S_IRUGO, + taos_gain_available_show, NULL); + +static DEVICE_ATTR(illuminance0_integration_time, S_IRUGO | S_IWUSR, + taos_als_time_show, taos_als_time_store); +static DEVICE_ATTR(illuminance0_integration_time_available, S_IRUGO, + taos_als_time_available_show, NULL); + +static DEVICE_ATTR(illuminance0_calibbias, S_IRUGO | S_IWUSR, + taos_als_trim_show, taos_als_trim_store); + +static DEVICE_ATTR(illuminance0_input_target, S_IRUGO | S_IWUSR, + taos_als_cal_target_show, taos_als_cal_target_store); + +static DEVICE_ATTR(illuminance0_raw, S_IRUGO, taos_adc_show, NULL); + +static DEVICE_ATTR(illuminance0_input, S_IRUGO, taos_lux_show, NULL); +static DEVICE_ATTR(illuminance0_calibrate, S_IWUSR, NULL, taos_do_calibrate); +static DEVICE_ATTR(illuminance0_lux_table, S_IRUGO | S_IWUSR, + taos_luxtable_show, taos_luxtable_store); + +static DEVICE_ATTR(intensity0_both_thresh_falling_value, S_IRUGO | S_IWUSR, + taos_als_thresh_low_show, taos_als_thresh_low_store); + +static DEVICE_ATTR(intensity0_both_thresh_rising_value, S_IRUGO | S_IWUSR, + taos_als_thresh_high_show, taos_als_thresh_high_store); + +static DEVICE_ATTR(sampling_frequency, S_IRUGO | S_IWUSR, + taos_als_persistence_show, taos_als_persistence_store); + +static DEVICE_ATTR(sampling_frequency_available, S_IRUGO, + taos_als_persistence_available_show, NULL); + +static struct attribute *sysfs_attrs_ctrl[] = { + &dev_attr_name.attr, + &dev_attr_power_state.attr, + &dev_attr_illuminance0_calibscale.attr, /* Gain */ + &dev_attr_illuminance0_calibscale_available.attr, + &dev_attr_illuminance0_integration_time.attr, /* I time*/ + &dev_attr_illuminance0_integration_time_available.attr, + &dev_attr_illuminance0_calibbias.attr, /* trim */ + &dev_attr_illuminance0_input_target.attr, + &dev_attr_illuminance0_raw.attr, + &dev_attr_illuminance0_input.attr, + &dev_attr_illuminance0_calibrate.attr, + &dev_attr_illuminance0_lux_table.attr, + &dev_attr_intensity0_both_thresh_falling_value.attr,/* Low T */ + &dev_attr_intensity0_both_thresh_rising_value.attr, /* High T */ + &dev_attr_sampling_frequency.attr, /* persist*/ + &dev_attr_sampling_frequency_available.attr, + NULL +}; + +static struct attribute_group tsl2571_attribute_group = { + .attrs = sysfs_attrs_ctrl, +}; + +/* + * Run-time interrupt handler - depending on whether the device is in ambient + * light sensing interrupt mode, this handler queues up + * the bottom-half tasklet, to handle all valid interrupts. + */ +static int taos_interrupt_th(struct iio_dev *dev_info, + int index, + s64 timestamp, + int not_test) +{ + struct tsl2571_chip *chip = dev_info->dev_data; + + schedule_work(&chip->work_thresh); + return 0; +} + +IIO_EVENT_SH(threshold, &taos_interrupt_th); + +IIO_EVENT_ATTR_SH(intensity0_both_thresh_en, + iio_event_threshold, + taos_als_interrupt_show, + taos_als_interrupt_store, + TSL257X_STA_ALS_INTR); + +static struct attribute *tsl2571_event_attributes[] = { + &iio_event_attr_intensity0_both_thresh_en.dev_attr.attr, + NULL, +}; + +static struct attribute_group tsl2571_event_attribute_group = { + .attrs = tsl2571_event_attributes, +}; + +/* Use the default register values to identify the Taos device */ +static int taos_TSL257X_device(unsigned char *bufp) +{ + return ((bufp[TSL257X_CHIPID] & 0xf0) == 0x00); +} + +/* + * Client probe function - When a valid device is found, the driver's device + * data structure is updated, and initialization completes successfully. + */ +static int __devinit taos_probe(struct i2c_client *clientp, + const struct i2c_device_id *idp) +{ + int i, ret = 0; + unsigned char buf[TSL257X_MAX_DEVICE_REGS]; + static struct tsl2571_chip *chip; + + if (!i2c_check_functionality(clientp->adapter, + I2C_FUNC_SMBUS_BYTE_DATA)) { + dev_err(&clientp->dev, + "taos_probe() - i2c smbus byte data " + "functions unsupported\n"); + return -EOPNOTSUPP; + } + + chip = kzalloc(sizeof(struct tsl2571_chip), GFP_KERNEL); + + chip->client = clientp; + i2c_set_clientdata(clientp, chip); + + mutex_init(&chip->als_mutex); + chip->taos_chip_status = TSL257X_CHIP_UNKNOWN; + memcpy(chip->taos_config, taos_config, sizeof(chip->taos_config)); + + for (i = 0; i < TSL257X_MAX_DEVICE_REGS; i++) { + ret = i2c_smbus_write_byte(clientp, + (TSL257X_CMD_REG | (TSL257X_CNTRL + i))); + if (ret < 0) { + dev_err(&clientp->dev, "i2c_smbus_write_bytes() to cmd " + "reg failed in taos_probe(), err = %d\n", ret); + goto fail1; + } + ret = i2c_smbus_read_byte(clientp); + if (ret < 0) { + dev_err(&clientp->dev, "i2c_smbus_read_byte from " + "reg failed in taos_probe(), err = %d\n", ret); + + goto fail1; + } + buf[i] = ret; + } + + if (!taos_TSL257X_device(buf)) { + dev_info(&clientp->dev, "i2c device found but does not match " + "expected id in taos_probe()\n"); + goto fail1; + } + + ret = i2c_smbus_write_byte(clientp, (TSL257X_CMD_REG | TSL257X_CNTRL)); + if (ret < 0) { + dev_err(&clientp->dev, "i2c_smbus_write_byte() to cmd reg " + "failed in taos_probe(), err = %d\n", ret); + goto fail1; + } + + chip->iio_dev = iio_allocate_device(); + if (!chip->iio_dev) + goto fail1; + + chip->iio_dev->attrs = &tsl2571_attribute_group; + chip->iio_dev->dev.parent = &clientp->dev; + chip->iio_dev->dev_data = (void *)(chip); + chip->iio_dev->num_interrupt_lines = 1; + chip->iio_dev->event_attrs = &tsl2571_event_attribute_group; + chip->iio_dev->driver_module = THIS_MODULE; + chip->iio_dev->modes = INDIO_DIRECT_MODE; + + ret = iio_device_register(chip->iio_dev); + if (ret) + goto fail1; + + if (chip->irq_no) { + ret = iio_register_interrupt_line(chip->irq_no, + chip->iio_dev, + 0, + IRQF_TRIGGER_FALLING, + "tsl2571"); + if (ret) + goto fail1; + + iio_add_event_to_list(&iio_event_threshold, + &chip->iio_dev->interrupts[0]->ev_list); + } + + /* Defaults - (these are can be changed in the device[x]/ABI) */ + taos_defaults(chip); + + INIT_WORK(&chip->work_thresh, taos_als_interrupt_bh); + + /* Make sure the chip is on */ + taos_chip_on(clientp); + + dev_info(&clientp->dev, "Light sensor found.\n"); + + return 0; + +fail1: + kfree(chip); + + return ret; +} + +static int taos_suspend(struct i2c_client *client, pm_message_t state) +{ + struct tsl2571_chip *chip = i2c_get_clientdata(client); + int ret = 0; + + mutex_lock(&chip->als_mutex); + + if (chip->taos_chip_status == TSL257X_CHIP_WORKING) { + ret = taos_chip_off(client); + chip->taos_chip_status = TSL257X_CHIP_SUSPENDED; + } + + mutex_unlock(&chip->als_mutex); + return ret; +} + +static int taos_resume(struct i2c_client *client) +{ + struct tsl2571_chip *chip = i2c_get_clientdata(client); + int ret = 0; + + mutex_lock(&chip->als_mutex); + + if (chip->taos_chip_status == TSL257X_CHIP_SUSPENDED) + ret = taos_chip_on(client); + + mutex_unlock(&chip->als_mutex); + return ret; +} + + +static int __devexit taos_remove(struct i2c_client *client) +{ + struct tsl2571_chip *chip = i2c_get_clientdata(client); + + taos_chip_off(client); + + if (chip->irq_no) + free_irq(chip->irq_no, chip->client->name); + flush_scheduled_work(); + iio_device_unregister(chip->iio_dev); + + kfree(chip); + return 0; +} + +static struct i2c_device_id taos_idtable[] = { + { "tsl2571", 0 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, taos_idtable); + +/* Driver definition */ +static struct i2c_driver taos_driver = { + .driver = { + .name = "tsl2571", + }, + .id_table = taos_idtable, + .suspend = taos_suspend, + .resume = taos_resume, + .probe = taos_probe, + .remove = __devexit_p(taos_remove), +}; + +static int __init taos_init(void) +{ + return i2c_add_driver(&taos_driver); +} + +static void __exit taos_exit(void) +{ + i2c_del_driver(&taos_driver); +} + +module_init(taos_init); +module_exit(taos_exit); + +MODULE_AUTHOR("J. August Brenner<jbrenner@xxxxxxxxxxx>"); +MODULE_DESCRIPTION("TAOS tsl2571 ambient light sensor driver"); +MODULE_LICENSE("GPL"); -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html