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Date: Tue, 08 Mar 2011 19:32:22 -0600 From: Jon Brenner <jbrenner@...sinc.com> To: Jonathan Cameron <jic23@....ac.uk> Cc: Linux Kernel <linux-kernel@...r.kernel.org> Subject: [PATCH 2.6.38-rc7]TAOS 258x: Device Driver From: J. August Brenner <jbrenner@...sinc.com> This driver supports the TAOS tsl258x family of ALS sensors. This driver provides ALS data (lux), and device configuration via isysfs/iio. More significantly, this driver provides the capability to be fed 'glass coefficients' to accommodate varying system designs (bezels, faceplates, etc.). Signed-off-by: Jon August Brenner <jbrenner@...sinc.com> --- >>From 5b8364f9828dbad5fbfff96385e3fc2a6a6d56ed Mon Sep 17 00:00:00 2001 From: Jon Brenner <jbrenner@...sinc.com> Date: Tue, 8 Mar 2011 18:37:13 -0600 Subject: [PATCH] TAOS driver for the tsl258x family of devices. --- Makefile | 2 +- .../staging/iio/Documentation/sysfs-bus-iio-light | 63 ++ drivers/staging/iio/light/Kconfig | 7 + drivers/staging/iio/light/Makefile | 1 + drivers/staging/iio/light/tsl258x.c | 1010 ++++++++++++++++++++ 5 files changed, 1082 insertions(+), 1 deletions(-) diff --git a/Makefile b/Makefile index 26d7d82..2f7d922 100644 --- a/Makefile +++ b/Makefile @@ -1,7 +1,7 @@ VERSION = 2 PATCHLEVEL = 6 SUBLEVEL = 38 -EXTRAVERSION = -rc6 +EXTRAVERSION = -rc7 NAME = Flesh-Eating Bats with Fangs # *DOCUMENTATION* diff --git a/drivers/staging/iio/Documentation/sysfs-bus-iio-light b/drivers/staging/iio/Documentation/sysfs-bus-iio-light index 5d84856..5affc2a 100644 --- a/drivers/staging/iio/Documentation/sysfs-bus-iio-light +++ b/drivers/staging/iio/Documentation/sysfs-bus-iio-light @@ -62,3 +62,66 @@ Description: sensing mode. This value should be the output from a reading and if expressed in SI units, should include _input. If this value is not in SI units, then it should include _raw. + +What: /sys/bus/iio/devices/device[n]/device_state +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + This property gets/sets the TAOS tsl258x power state. + +What: /sys/bus/iio/devices/device[n]/als_gain +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + This property gets/sets the TAOS tsl258x analog gain settings + of the device. + +What: /sys/bus/iio/devices/device[n]/als_time +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + This property gets/sets the TAOS tsl258x ADC channel integration + time in 2.7ms increments. + +What: /sys/bus/iio/devices/device[n]/als_trim +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + This property gets/sets the TAOS tsl258x ADC active gain scale. + +What: /sys/bus/iio/devices/device[n]/als_target +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + This property gets/sets the TAOS tsl258x ADC last known external + lux measurement used in calibration. + +What: /sys/bus/iio/devices/device[n]/lux +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + This property gets the TAOS tsl258x calculated lux value. + +What: /sys/bus/iio/devices/device[n]/lux_table +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + This property gets/sets the TAOS tsl258x lux table of coefficients + that are used to calculate lux. + +What: /sys/bus/iio/devices/device[n]/reg_offset +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + This property gets/sets an index the TAOS tsl258x internel register + for r/w of selected register. + +What: /sys/bus/iio/devices/device[n]/reg_offset +KernelVersion: 2.6.37 +Contact: linux-iio@...r.kernel.org +Description: + This property gets/sets an TAOS tsl258x internel register value + indexed by reg_offset. + + + \ No newline at end of file diff --git a/drivers/staging/iio/light/Kconfig b/drivers/staging/iio/light/Kconfig index 36d8bbe..ae499b8 100644 --- a/drivers/staging/iio/light/Kconfig +++ b/drivers/staging/iio/light/Kconfig @@ -13,6 +13,13 @@ config SENSORS_TSL2563 This driver can also be built as a module. If so, the module will be called tsl2563. +config TAOS_258x + tristate "TAOS TSL258x device driver" + default m + help + Provides support for the TAOS tsl258x family of devices. + Access ALS data/control via sysfs/iio. + config SENSORS_ISL29018 tristate "ISL 29018 light and proximity sensor" depends on I2C diff --git a/drivers/staging/iio/light/Makefile b/drivers/staging/iio/light/Makefile index 9142c0e..4395db8 100644 --- a/drivers/staging/iio/light/Makefile +++ b/drivers/staging/iio/light/Makefile @@ -3,4 +3,5 @@ # obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o +obj-$(CONFIG_TAOS_258x) += tsl258x.o obj-$(CONFIG_SENSORS_ISL29018) += isl29018.o diff --git a/drivers/staging/iio/light/tsl258x.c b/drivers/staging/iio/light/tsl258x.c new file mode 100644 index 0000000..225d85b --- /dev/null +++ b/drivers/staging/iio/light/tsl258x.c @@ -0,0 +1,1010 @@ +/* + * Device driver for monitoring ambient light intensity (lux) + * within the TAOS tsl258x family of devices + * + * 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 "../iio.h" + +#define DEVICE_ID "tsl258x" + +#define MAX_DEVICE_REGS 32 + +/* Triton register offsets */ +#define TAOS_REG_MAX 8 + +/* Device Registers and Masks */ +#define TSL258X_CNTRL 0x00 +#define TSL258X_STATUS 0x00 +#define TSL258X_ALS_TIME 0X01 +#define TSL258X_INTERRUPT 0x02 +#define TSL258X_GAIN 0x07 +#define TSL258X_REVID 0x11 +#define TSL258X_CHIPID 0x12 +#define TSL258X_SMB_4 0x13 +#define TSL258X_ALS_CHAN0LO 0x14 +#define TSL258X_ALS_CHAN0HI 0x15 +#define TSL258X_ALS_CHAN1LO 0x16 +#define TSL258X_ALS_CHAN1HI 0x17 +#define TSL258X_TMR_LO 0x18 +#define TSL258X_TMR_HI 0x19 + +/* Skate cmd reg masks */ +#define TSL258X_CMD_REG 0x80 +#define TSL258X_CMD_BYTE_RW 0x00 +#define TSL258X_CMD_WORD_BLK_RW 0x20 +#define TSL258X_CMD_SPL_FN 0x60 +#define TSL258X_CMD_ALS_INTCLR 0X01 + +/* Skate cntrl reg masks */ +#define TSL258X_CNTL_REG_CLEAR 0x00 +#define TSL258X_CNTL_ALS_INT_ENBL 0x10 +#define TSL258X_CNTL_WAIT_TMR_ENBL 0x08 +#define TSL258X_CNTL_ADC_ENBL 0x02 +#define TSL258X_CNTL_PWRON 0x01 +#define TSL258X_CNTL_ALSPON_ENBL 0x03 +#define TSL258X_CNTL_INTALSPON_ENBL 0x13 + +/* Skate status reg masks */ +#define TSL258X_STA_ADCVALID 0x01 +#define TSL258X_STA_ALSINTR 0x10 +#define TSL258X_STA_ADCINTR 0x10 + +/* Lux constants */ +#define MAX_LUX 65535 + +enum { + TAOS_CHIP_UNKNOWN = 0, TAOS_CHIP_WORKING = 1, TAOS_CHIP_SLEEP = 2 +} TAOS_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; +}; + +struct tsl258x_chip { + struct mutex als_mutex; + struct i2c_client *client; + struct iio_dev *iio_dev; + struct delayed_work update_lux; + unsigned int addr; + char taos_id; + char valid; + unsigned long last_updated; + 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[8]; +}; + +static int taos_i2c_read(struct i2c_client *client, u8 reg, u8 *val, + unsigned int len); +static int taos_i2c_write_command(struct i2c_client *client, u8 reg); + +/* + * Initial values for device - this values can/will be changed by driver. + * and applications as needed. + * These values are dynamic. + */ +static const u8 taos_config[8] = { + 0x00, 0xee, 0x00, 0x03, 0x00, 0xFF, 0xFF, 0x00 +}; /* cntrl atime intC Athl0 Athl1 Athh0 Athh1 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 */ +struct taos_lux taos_device_lux[11] = { + { 9830, 8520, 15729 }, + { 12452, 10807, 23344 }, + { 14746, 6383, 11705 }, + { 17695, 4063, 6554 }, +}; + +struct taos_lux taos_lux; + +struct gainadj { + s16 ch0; + s16 ch1; +}; + +/* Index = (0 - 3) Used to validate the gain selection index */ +static const struct gainadj gainadj[] = { + { 1, 1 }, + { 8, 8 }, + { 16, 16 }, + { 107, 115 } +}; + +/* + * Provides initial operational parameter defaults. + * These defaults may be changed through the device's sysfs files. + */ +static void taos_defaults(struct tsl258x_chip *chip) +{ + /* Operational parameters */ + chip->taos_settings.als_time = 450; + /* must be a multiple of 50mS */ + chip->taos_settings.als_gain = 2; + /* 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 */ + + /* Initialize ALS data to defaults */ + chip->als_cur_info.als_ch0 = 0; + chip->als_cur_info.als_ch1 = 0; + chip->als_cur_info.lux = 0; +} + +/* + * 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, (TSL258X_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++; + if ((reg & 0x1f) == 0x1f) + break; + reg++; + } + return 0; +} + +/* + * This function is used to send a command to device command/control register + * All bytes sent using this command have their MSBit set - it's a command! + * Return 0, or i2c_smbus_write_byte error code. + */ +static int taos_i2c_write_command(struct i2c_client *client, u8 reg) +{ + int ret; + + /* write the data */ + ret = i2c_smbus_write_byte(client, (reg |= TSL258X_CMD_REG)); + if (ret < 0) { + dev_err(&client->dev, "FAILED: i2c_smbus_write_byte\n"); + return ret; + } + 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) +{ + u32 ch0, ch1; /* separated ch0/ch1 data from device */ + u32 lux; /* raw lux calculated from device data */ + u32 ratio; + u8 buf[5]; + struct taos_lux *p; + struct tsl258x_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 != TAOS_CHIP_WORKING) { + /* device is not enabled */ + dev_err(&client->dev, "taos_get_lux device is not enabled\n"); + ret = -ENODEV; + goto out_unlock; + } + + ret = taos_i2c_read(client, (TSL258X_CMD_REG), &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] & TSL258X_STA_ADCINTR)) { + 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++) { + int reg = TSL258X_CMD_REG | (TSL258X_ALS_CHAN0LO + i); + ret = taos_i2c_read(client, reg, &buf[i], 1); + if (ret < 0) { + dev_err(&client->dev, "taos_get_lux failed to read" + " register %x\n", reg); + goto out_unlock; + } + } + + /* clear status, really interrupt status (interrupts are off), but + * we use the bit anyway */ + ret = taos_i2c_write_command(client, + TSL258X_CMD_REG | TSL258X_CMD_SPL_FN | TSL258X_CMD_ALS_INTCLR); + 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 = (buf[1] << 8) | buf[0]; + ch1 = (buf[3] << 8) | 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) + + (gainadj[chip->taos_settings.als_gain].ch0 >> 1)) + / gainadj[chip->taos_settings.als_gain].ch0; + ch1lux = ((ch1 * p->ch1) + + (gainadj[chip->taos_settings.als_gain].ch1 >> 1)) + / 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 >>= 13; /* tables have factor of 8192 builtin for accuracy */ + lux = (lux * chip->taos_settings.als_gain_trim + 500) / 1000; + if (lux > MAX_LUX) { /* check for overflow */ +return_max: + lux = MAX_LUX; + } + + /* 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; +} + +/* + * 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 tsl258x_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, (TSL258X_CMD_REG | TSL258X_CNTRL)); + if (ret < 0) { + dev_err(&client->dev, "taos_als_calibrate failed to reach the" + " CNTRL register, ret=%d\n", ret); + return ret; + } + + reg_val = i2c_smbus_read_byte(client); + if ((reg_val & (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWRON)) + != (TSL258X_CNTL_ADC_ENBL | TSL258X_CNTL_PWRON)) { + dev_err(&client->dev, "taos_als_calibrate failed because the" + " device is not powered on with ADC enabled\n"); + return -ENODATA; + } + + ret = i2c_smbus_write_byte(client, (TSL258X_CMD_REG | TSL258X_STATUS)); + if (ret < 0) { + dev_err(&client->dev, "taos_als_calibrate failed to reach the" + " STATUS register, ret=%d\n", ret); + return ret; + } + reg_val = i2c_smbus_read_byte(client); + + if ((reg_val & TSL258X_STA_ADCVALID) != TSL258X_STA_ADCVALID) { + dev_err(&client->dev, "taos_als_calibrate failed because the" + " STATUS did not indicate ADC valid.\n"); + return -ENODATA; + } + 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); + + dev_info(&client->dev, "taos_settings.als_cal_target = %d\n" + "taos_settings.als_gain_trim = %d\nlux_val = %d\n", + 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 because" + "trim_val of %d is out of range\n", gain_trim_val); + return -ENODATA; + } + 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 tsl258x_chip *chip = i2c_get_clientdata(client); + + /* and make sure we're not already on */ + if (chip->taos_chip_status == TAOS_CHIP_WORKING) { + /* if forcing a register update - turn off, then on */ + dev_info(&client->dev, "device is already enabled\n"); + return -1; + } + + /* 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[TSL258X_ALS_TIME] = 256 - als_count; + + + /* Set the gain based on taos_settings struct */ + chip->taos_config[TSL258X_GAIN] = chip->taos_settings.als_gain; + + + /* set globals re scaling and saturation */ + chip->als_saturation = als_count * 922; /* 90% of full scale */ + chip->als_time_scale = (als_time + 25) / 50; + + /* SKATE Specific power-on / adc enable sequence + * Power on the device 1st. */ + utmp = TSL258X_CNTL_PWRON; + ret = i2c_smbus_write_byte_data(client, TSL258X_CMD_REG | TSL258X_CNTRL, + utmp); + if (ret < 0) { + dev_err(&client->dev, "taos_chip_on failed on CNTRL reg.\n"); + return -1; + } + + /* Use the following shadow copy for our delay before enabling ADC. + * Write all the registers. */ + for (i = 0, uP = chip->taos_config; i < TAOS_REG_MAX; i++) { + ret = i2c_smbus_write_byte_data(client, TSL258X_CMD_REG + i, + *uP++); + if (ret < 0) { + dev_err(&client->dev, + "taos_chip_on failed on reg %d.\n", i); + return -1; + } + } + + mdelay(3); + /* NOW enable the ADC + * initialize the desired mode of operation */ + utmp = TSL258X_CNTL_PWRON | TSL258X_CNTL_ADC_ENBL; + ret = i2c_smbus_write_byte_data(client, TSL258X_CMD_REG | TSL258X_CNTRL, + utmp); + if (ret < 0) { + dev_err(&client->dev, "taos_chip_on failed on 2nd CTRL reg.\n"); + return -1; + } + chip->taos_chip_status = TAOS_CHIP_WORKING; + return ret; /* returns result of last i2cwrite */ +} + +/* Turn the device OFF. */ +static int taos_chip_off(struct i2c_client *client) +{ + struct tsl258x_chip *chip = i2c_get_clientdata(client); + int ret; + u8 utmp; + + /* turn device off */ + chip->taos_chip_status = TAOS_CHIP_SLEEP; + utmp = 0x00; + ret = i2c_smbus_write_byte_data(client, TSL258X_CMD_REG | TSL258X_CNTRL, + utmp); + return ret; +} + +/* Sysfs Interface Functions */ +static ssize_t taos_device_id(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%s\n", DEVICE_ID); +} + +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 tsl258x_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 tsl258x_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 tsl258x_chip *chip = indio_dev->dev_data; + + return sprintf(buf, "%d\n", chip->taos_settings.als_gain); +} + +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 tsl258x_chip *chip = indio_dev->dev_data; + unsigned long value; + if (strict_strtoul(buf, 0, &value)) + return -EINVAL; + if (value) { + if (value > 4) { + dev_err(dev, "Invalid Gain Index\n"); + return -1; + } else { + chip->taos_settings.als_gain = value; + } + } + return len; +} + +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 tsl258x_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 tsl258x_chip *chip = indio_dev->dev_data; + unsigned long value; + + if (strict_strtoul(buf, 0, &value)) + return -EINVAL; + + if (value) + chip->taos_settings.als_time = value; + + return len; +} + +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 tsl258x_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 tsl258x_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_als_cal_target_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl258x_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 tsl258x_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_lux_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl258x_chip *chip = indio_dev->dev_data; + int lux = 0; + + 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 tsl258x_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 tsl258x_chip *chip = indio_dev->dev_data; +#define MAX_LUX_TABLE_FIELDS 33 + int value[MAX_LUX_TABLE_FIELDS]; + 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 > (MAX_LUX_TABLE_FIELDS - 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 == TAOS_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 u8 reg_index; + +/* Sets a pointer to a register for R/W via sysfs */ +static ssize_t taos_reg_offset_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", reg_index); + return 0; +} + +static ssize_t taos_reg_offset_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + unsigned long value; + if (strict_strtoul(buf, 0, &value)) + return -EINVAL; + + if (value > MAX_DEVICE_REGS) { + dev_err(dev, "register offset exceeds MAX\n"); + return -1; + } else { + reg_index = value; + } +return len; +} + +/* R/W a register for R/W via sysfs */ +static ssize_t taos_reg_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl258x_chip *chip = indio_dev->dev_data; + + u8 value = 0; + int ret = 0; + + ret = i2c_smbus_write_byte(chip->client, + (TSL258X_CMD_REG | reg_index)); + if (ret < 0) { + dev_err(dev, "i2c_smbus_write_byte to cmd reg failed " + "in taos_reg_offset_show(), err = %d\n", ret); + return ret; + } + value = i2c_smbus_read_byte(chip->client); + return sprintf(buf, "%d\n", value); + +return 0; +} + +static ssize_t taos_reg_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct tsl258x_chip *chip = indio_dev->dev_data; + + unsigned long value = 0; + int ret = 0; + + if (strict_strtoul(buf, 0, &value)) + return -EINVAL; + + ret = i2c_smbus_write_byte_data(chip->client, + (TSL258X_CMD_REG | reg_index), value); + if (ret < 0) { + dev_err(dev, "i2c_smbus_write_byte_data failed in " + "taos_reg_store()\n"); + return ret; + } + +return len; +} + +static DEVICE_ATTR(name, S_IRUGO, taos_device_id, NULL); +static DEVICE_ATTR(device_state, S_IRUGO | S_IWUSR, + taos_power_state_show, taos_power_state_store); +static DEVICE_ATTR(als_gain, S_IRUGO | S_IWUSR, + taos_gain_show, taos_gain_store); +static DEVICE_ATTR(als_time, S_IRUGO | S_IWUSR, + taos_als_time_show, taos_als_time_store); +static DEVICE_ATTR(als_trim, S_IRUGO | S_IWUSR, + taos_als_trim_show, taos_als_trim_store); +static DEVICE_ATTR(als_target, S_IRUGO | S_IWUSR, + taos_als_cal_target_show, taos_als_cal_target_store); +static DEVICE_ATTR(lux, S_IRUGO, taos_lux_show, NULL); +static DEVICE_ATTR(calibrate, S_IWUSR, NULL, taos_do_calibrate); +static DEVICE_ATTR(lux_table, S_IRUGO | S_IWUSR, + taos_luxtable_show, taos_luxtable_store); +static DEVICE_ATTR(reg_offset, S_IRUGO | S_IWUSR, + taos_reg_offset_show, + taos_reg_offset_store); +static DEVICE_ATTR(reg, S_IRUGO | S_IWUSR, + taos_reg_show, + taos_reg_store); + + +static struct attribute *sysfs_attrs_ctrl[] = { + &dev_attr_name.attr, + &dev_attr_device_state.attr, + &dev_attr_als_gain.attr, + &dev_attr_als_time.attr, + &dev_attr_als_trim.attr, + &dev_attr_als_target.attr, + &dev_attr_lux.attr, + &dev_attr_calibrate.attr, + &dev_attr_lux_table.attr, + &dev_attr_reg_offset.attr, + &dev_attr_reg.attr, + NULL +}; + +static struct attribute_group tsl258x_attribute_group = { + .attrs = sysfs_attrs_ctrl, +}; + +/* Use the default register values to identify the Taos device */ +static int taos_skate_device(unsigned char *bufp) +{ + if (((bufp[TSL258X_CHIPID] & 0xf0) == 0x90)) + /* tsl258x */ + return 1; + /* else unknown */ + return 0; +} + +/* + * 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[MAX_DEVICE_REGS]; + static struct tsl258x_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; + } + if (!i2c_check_functionality(clientp->adapter, + I2C_FUNC_SMBUS_WORD_DATA)) { + dev_warn(&clientp->dev, + "taos_probe() - i2c smbus word data " + "functions unsupported\n"); + } + if (!i2c_check_functionality(clientp->adapter, + I2C_FUNC_SMBUS_BLOCK_DATA)) { + dev_err(&clientp->dev, + "taos_probe() - i2c smbus block data " + "functions unsupported\n"); + } + + chip = kmalloc(sizeof(struct tsl258x_chip), GFP_KERNEL); + if (!chip) { + dev_err(&clientp->dev, "taos_device_drvr: kmalloc for " + "struct tsl258x_chip failed in taos_probe()\n"); + return -ENOMEM; + } + memset(chip, 0, sizeof(struct tsl258x_chip)); + chip->client = clientp; + i2c_set_clientdata(clientp, chip); + + mutex_init(&chip->als_mutex); + chip->taos_chip_status = TAOS_CHIP_UNKNOWN; /* uninitialized to start */ + memcpy(chip->taos_config, taos_config, sizeof(chip->taos_config)); + + for (i = 0; i < MAX_DEVICE_REGS; i++) { + ret = i2c_smbus_write_byte(clientp, + (TSL258X_CMD_REG | (TSL258X_CNTRL + i))); + if (ret < 0) { + dev_err(&clientp->dev, "i2c_smbus_write_byte() to cmd " + "reg failed in taos_probe(), err = %d\n", ret); + goto fail1; + } + buf[i] = i2c_smbus_read_byte(clientp); + } + if (!taos_skate_device(buf)) { + dev_info(&clientp->dev, "i2c device found but does not match " + "expected id in taos_probe()\n"); + goto fail1; + } else { + dev_info(&clientp->dev, "i2c device match in probe\n"); + } + ret = i2c_smbus_write_byte(clientp, (TSL258X_CMD_REG | TSL258X_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->valid = 0; + + chip->iio_dev = iio_allocate_device(); + if (!chip->iio_dev) { + ret = -ENOMEM; + dev_err(&clientp->dev, "iio allocation failed\n"); + goto fail1; + } + + chip->iio_dev->attrs = &tsl258x_attribute_group; + chip->iio_dev->dev.parent = &clientp->dev; + chip->iio_dev->dev_data = (void *)(chip); + chip->iio_dev->driver_module = THIS_MODULE; + chip->iio_dev->modes = INDIO_DIRECT_MODE; + ret = iio_device_register(chip->iio_dev); + if (ret) { + dev_err(&clientp->dev, "iio registration failed\n"); + goto fail1; + } + + /* Load up the V2 defaults (these are hard coded defaults for now) */ + taos_defaults(chip); + + /* 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 __devexit taos_remove(struct i2c_client *client) +{ + struct tsl258x_chip *chip = i2c_get_clientdata(client); + + iio_device_unregister(chip->iio_dev); + + kfree(chip); + return 0; +} + +static struct i2c_device_id taos_idtable[] = { + { DEVICE_ID, 0 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, taos_idtable); + +/* Driver definition */ +static struct i2c_driver taos_driver = { + .driver = { + .name = "tsl258x", + }, + .id_table = taos_idtable, + .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@...sinc.com>"); +MODULE_DESCRIPTION("TAOS tsl258x ambient light sensor driver"); +MODULE_LICENSE("GPL"); + -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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