From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934337Ab2DLONO (ORCPT ); Thu, 12 Apr 2012 10:13:14 -0400 Received: from hqemgate03.nvidia.com ([216.228.121.140]:19474 "EHLO hqemgate03.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934057Ab2DLONM (ORCPT ); Thu, 12 Apr 2012 10:13:12 -0400 X-PGP-Universal: processed; by hqnvupgp06.nvidia.com on Thu, 12 Apr 2012 07:13:00 -0700 From: Laxman Dewangan To: jic23@cam.ac.uk, gregkh@linuxfoundation.org, grant.likely@secretlab.ca, rob.herring@calxeda.com, jbrenner@taosinc.com, rklein@nvidia.com, max@stro.at Cc: linux-iio@vger.kernel.org, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, devicetree-discuss@lists.ozlabs.org, Laxman Dewangan Subject: [PATCH V4 2/2] staging: iio: add driver for isl29028 Date: Thu, 12 Apr 2012 19:31:06 +0530 Message-Id: <1334239266-29505-3-git-send-email-ldewangan@nvidia.com> X-Mailer: git-send-email 1.7.1.1 In-Reply-To: <1334239266-29505-1-git-send-email-ldewangan@nvidia.com> References: <1334239266-29505-1-git-send-email-ldewangan@nvidia.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Intersil's ISL29028 is concurrent Ambient Light and Proximity Sensor device. Add driver to access the light and IR intensity and proximity value via iio interface. Signed-off-by: Laxman Dewangan --- Changes from V1: - Taken care of cleanups comments. Changes from V2: - use the channel info for sampling frequency selection rather than exposing separate sysfs from driver. Changes from V3: - Remove sysfs range and add scale through channel info. drivers/staging/iio/light/Kconfig | 10 + drivers/staging/iio/light/Makefile | 1 + drivers/staging/iio/light/isl29028.c | 563 ++++++++++++++++++++++++++++++++++ 3 files changed, 574 insertions(+), 0 deletions(-) create mode 100644 drivers/staging/iio/light/isl29028.c diff --git a/drivers/staging/iio/light/Kconfig b/drivers/staging/iio/light/Kconfig index e7e9159..53b49f7 100644 --- a/drivers/staging/iio/light/Kconfig +++ b/drivers/staging/iio/light/Kconfig @@ -14,6 +14,16 @@ config SENSORS_ISL29018 in lux, proximity infrared sensing and normal infrared sensing. Data from sensor is accessible via sysfs. +config SENSORS_ISL29028 + tristate "Intersil ISL29028 Concurrent Light and Proximity Sensor" + depends on I2C + select REGMAP_I2C + help + Provides driver for the Intersil's ISL29028 device. + This driver supports the sysfs interface to get the ALS, IR intensity, + Proximity value via iio. The ISL29028 provides the concurrent sensing + of ambient light and proximity. + config SENSORS_TSL2563 tristate "TAOS TSL2560, TSL2561, TSL2562 and TSL2563 ambient light sensors" depends on I2C diff --git a/drivers/staging/iio/light/Makefile b/drivers/staging/iio/light/Makefile index 3011fbf..535d313 100644 --- a/drivers/staging/iio/light/Makefile +++ b/drivers/staging/iio/light/Makefile @@ -4,4 +4,5 @@ obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o obj-$(CONFIG_SENSORS_ISL29018) += isl29018.o +obj-$(CONFIG_SENSORS_ISL29028) += isl29028.o obj-$(CONFIG_TSL2583) += tsl2583.o diff --git a/drivers/staging/iio/light/isl29028.c b/drivers/staging/iio/light/isl29028.c new file mode 100644 index 0000000..faa64f7 --- /dev/null +++ b/drivers/staging/iio/light/isl29028.c @@ -0,0 +1,563 @@ +/* + * IIO driver for the light sensor ISL29028. + * ISL29028 is Concurrent Ambient Light and Proximity Sensor + * + * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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, see . + */ + +#include +#include +#include +#include +#include +#include +#include +#include "../iio.h" +#include "../sysfs.h" + +#define CONVERSION_TIME_MS 100 + +#define ISL29028_REG_CONFIGURE 0x01 + +#define CONFIGURE_ALS_IR_MODE_ALS 0 +#define CONFIGURE_ALS_IR_MODE_IR BIT(0) +#define CONFIGURE_ALS_IR_MODE_MASK BIT(0) + +#define CONFIGURE_ALS_RANGE_LOW_LUX 0 +#define CONFIGURE_ALS_RANGE_HIGH_LUX BIT(1) +#define CONFIGURE_ALS_RANGE_MASK BIT(1) + +#define CONFIGURE_ALS_DIS 0 +#define CONFIGURE_ALS_EN BIT(2) +#define CONFIGURE_ALS_EN_MASK BIT(2) + +#define CONFIGURE_PROX_DRIVE BIT(3) + +#define CONFIGURE_PROX_SLP_SH 4 +#define CONFIGURE_PROX_SLP_MASK (7 << CONFIGURE_PROX_SLP_SH) + +#define CONFIGURE_PROX_EN BIT(7) +#define CONFIGURE_PROX_EN_MASK BIT(7) + +#define ISL29028_REG_INTERRUPT 0x02 + +#define ISL29028_REG_PROX_DATA 0x08 +#define ISL29028_REG_ALSIR_L 0x09 +#define ISL29028_REG_ALSIR_U 0x0A + +#define ISL29028_REG_TEST1_MODE 0x0E +#define ISL29028_REG_TEST2_MODE 0x0F + +#define ISL29028_MAX_REGS (ISL29028_REG_TEST2_MODE + 1) + +enum als_ir_mode { + MODE_NONE = 0, + MODE_ALS, + MODE_IR +}; + +struct isl29028_chip { + struct device *dev; + struct mutex lock; + struct regmap *regmap; + + unsigned int prox_sampling; + bool enable_prox; + + int lux_scale; + int als_ir_mode; +}; + +static int isl29028_set_proxim_sampling(struct isl29028_chip *chip, + unsigned int sampling) +{ + static unsigned int prox_period[] = {800, 400, 200, 100, 75, 50, 12, 0}; + int sel; + unsigned int period = DIV_ROUND_UP(1000, sampling); + + for (sel = 0; sel < ARRAY_SIZE(prox_period); ++sel) { + if (period >= prox_period[sel]) + break; + } + return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_PROX_SLP_MASK, sel << CONFIGURE_PROX_SLP_SH); +} + +static int isl29028_enable_proximity(struct isl29028_chip *chip, bool enable) +{ + int ret; + int val = 0; + + if (enable) + val = CONFIGURE_PROX_EN; + ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_PROX_EN_MASK, val); + if (ret < 0) + return ret; + + /* Wait for conversion to be complete for first sample */ + mdelay(DIV_ROUND_UP(1000, chip->prox_sampling)); + return 0; +} + +static int isl29028_set_als_scale(struct isl29028_chip *chip, int lux_scale) +{ + int val = (lux_scale == 2000) ? CONFIGURE_ALS_RANGE_HIGH_LUX : + CONFIGURE_ALS_RANGE_LOW_LUX; + + return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_ALS_RANGE_MASK, val); +} + +static int isl29028_set_als_ir_mode(struct isl29028_chip *chip, + enum als_ir_mode mode) +{ + int ret = 0; + + switch (mode) { + case MODE_ALS: + ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_ALS_IR_MODE_MASK, CONFIGURE_ALS_IR_MODE_ALS); + if (ret < 0) + return ret; + + ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_ALS_RANGE_MASK, CONFIGURE_ALS_RANGE_HIGH_LUX); + break; + + case MODE_IR: + ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_ALS_IR_MODE_MASK, CONFIGURE_ALS_IR_MODE_IR); + break; + + case MODE_NONE: + return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_ALS_EN_MASK, CONFIGURE_ALS_DIS); + } + + if (ret < 0) + return ret; + + /* Enable the ALS/IR */ + ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_ALS_EN_MASK, CONFIGURE_ALS_EN); + if (ret < 0) + return ret; + + /* Need to wait for conversion time if ALS/IR mode enabled */ + mdelay(CONVERSION_TIME_MS); + return 0; +} + +static int isl29028_read_als_ir(struct isl29028_chip *chip, int *als_ir) +{ + unsigned int lsb; + unsigned int msb; + int ret; + + ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_L, &lsb); + if (ret < 0) { + dev_err(chip->dev, + "Error in reading register ALSIR_L err %d\n", ret); + return ret; + } + + ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_U, &msb); + if (ret < 0) { + dev_err(chip->dev, + "Error in reading register ALSIR_U err %d\n", ret); + return ret; + } + + *als_ir = ((msb & 0xF) << 8) | (lsb & 0xFF); + return 0; +} + +static int isl29028_read_proxim(struct isl29028_chip *chip, int *prox) +{ + unsigned int data; + int ret; + + ret = regmap_read(chip->regmap, ISL29028_REG_PROX_DATA, &data); + if (ret < 0) { + dev_err(chip->dev, "Error in reading register %d, error %d\n", + ISL29028_REG_PROX_DATA, ret); + return ret; + } + *prox = data; + return 0; +} + +static int isl29028_proxim_get(struct isl29028_chip *chip, int *prox_data) +{ + int ret; + + if (!chip->enable_prox) { + ret = isl29028_enable_proximity(chip, true); + if (ret < 0) + return ret; + chip->enable_prox = true; + } + return isl29028_read_proxim(chip, prox_data); +} + +static int isl29028_als_get(struct isl29028_chip *chip, int *als_data) +{ + int ret; + int als_ir_data; + + if (chip->als_ir_mode != MODE_ALS) { + ret = isl29028_set_als_ir_mode(chip, MODE_ALS); + if (ret < 0) { + dev_err(chip->dev, + "Error in enabling ALS mode err %d\n", ret); + return ret; + } + chip->als_ir_mode = MODE_ALS; + } + + ret = isl29028_read_als_ir(chip, &als_ir_data); + if (ret < 0) + return ret; + + /* + * convert als data count to lux. + * if lux_scale = 125, lux = count * 0.031 + * if lux_scale = 2000, lux = count * 0.49 + */ + if (chip->lux_scale == 125) + als_ir_data = (als_ir_data * 31) / 1000; + else + als_ir_data = (als_ir_data * 49) / 100; + + *als_data = als_ir_data; + return 0; +} + +static int isl29028_ir_get(struct isl29028_chip *chip, int *ir_data) +{ + int ret; + + if (chip->als_ir_mode != MODE_IR) { + ret = isl29028_set_als_ir_mode(chip, MODE_IR); + if (ret < 0) { + dev_err(chip->dev, + "Error in enabling IR mode err %d\n", ret); + return ret; + } + chip->als_ir_mode = MODE_IR; + } + return isl29028_read_als_ir(chip, ir_data); +} + +/* Channel IO */ +static int isl29028_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int val, int val2, long mask) +{ + struct isl29028_chip *chip = iio_priv(indio_dev); + int ret = -EINVAL; + + mutex_lock(&chip->lock); + switch (chan->type) { + case IIO_PROXIMITY: + if (mask != IIO_CHAN_INFO_SAMP_FREQ_SEPARATE_BIT) { + dev_err(chip->dev, + "proximity: mask value 0x%08lx not supported\n", + mask); + break; + } + if (val < 1 || val > 100) { + dev_err(chip->dev, + "Samp_freq %d is not in range[1:100]\n", val); + break; + } + ret = isl29028_set_proxim_sampling(chip, val); + if (ret < 0) { + dev_err(chip->dev, + "Setting proximity samp_freq fail, err %d\n", + ret); + break; + } + chip->prox_sampling = val; + break; + + case IIO_LIGHT: + if (mask != IIO_CHAN_INFO_SCALE_SEPARATE_BIT) { + dev_err(chip->dev, + "light: mask value 0x%08lx not supported\n", + mask); + break; + } + if ((val != 125) && (val != 2000)) { + dev_err(chip->dev, + "lux scale %d is invalid [125, 2000]\n", val); + break; + } + ret = isl29028_set_als_scale(chip, val); + if (ret < 0) { + dev_err(chip->dev, + "Setting lux scale fail with error %d\n", ret); + break; + } + chip->lux_scale = val; + break; + + default: + dev_err(chip->dev, "Unsupported channel type\n"); + break; + } + mutex_unlock(&chip->lock); + return ret; +} + +static int isl29028_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, int *val2, long mask) +{ + struct isl29028_chip *chip = iio_priv(indio_dev); + int ret = -EINVAL; + + mutex_lock(&chip->lock); + switch (mask) { + case 0: + switch (chan->type) { + case IIO_LIGHT: + ret = isl29028_als_get(chip, val); + break; + case IIO_INTENSITY: + ret = isl29028_ir_get(chip, val); + break; + case IIO_PROXIMITY: + ret = isl29028_proxim_get(chip, val); + break; + default: + break; + } + if (ret < 0) + break; + ret = IIO_VAL_INT; + break; + + case IIO_CHAN_INFO_SAMP_FREQ_SEPARATE_BIT: + if (chan->type != IIO_PROXIMITY) + break; + *val = chip->prox_sampling; + ret = IIO_VAL_INT; + break; + + case IIO_CHAN_INFO_SCALE_SEPARATE_BIT: + if (chan->type != IIO_LIGHT) + break; + *val = chip->lux_scale; + ret = IIO_VAL_INT; + break; + + default: + dev_err(chip->dev, "mask value 0x%08lx not supported\n", mask); + break; + } + mutex_unlock(&chip->lock); + return ret; +} + +static IIO_CONST_ATTR(proximity_sampling_frequency_available, + "1, 3, 5, 10, 13, 20, 83, 100"); +static IIO_CONST_ATTR(illuminance_scale_available, "125, 2000"); + +#define ISL29028_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr) +#define ISL29028_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr) +static struct attribute *isl29028_attributes[] = { + ISL29028_CONST_ATTR(proximity_sampling_frequency_available), + ISL29028_CONST_ATTR(illuminance_scale_available), + NULL, +}; + +static const struct attribute_group isl29108_group = { + .attrs = isl29028_attributes, +}; + +static const struct iio_chan_spec isl29028_channels[] = { + { + .type = IIO_LIGHT, + .processed_val = 1, + .info_mask = IIO_CHAN_INFO_SCALE_SEPARATE_BIT, + }, { + .type = IIO_INTENSITY, + }, { + .type = IIO_PROXIMITY, + .info_mask = IIO_CHAN_INFO_SAMP_FREQ_SEPARATE_BIT, + } +}; + +static const struct iio_info isl29028_info = { + .attrs = &isl29108_group, + .driver_module = THIS_MODULE, + .read_raw = &isl29028_read_raw, + .write_raw = &isl29028_write_raw, +}; + +static int isl29028_chip_init(struct isl29028_chip *chip) +{ + int ret; + + chip->enable_prox = false; + chip->prox_sampling = 20; + chip->lux_scale = 2000; + chip->als_ir_mode = MODE_NONE; + + ret = regmap_write(chip->regmap, ISL29028_REG_TEST1_MODE, 0x0); + if (ret < 0) { + dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n", + __func__, ISL29028_REG_TEST1_MODE, ret); + return ret; + } + ret = regmap_write(chip->regmap, ISL29028_REG_TEST2_MODE, 0x0); + if (ret < 0) { + dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n", + __func__, ISL29028_REG_TEST2_MODE, ret); + return ret; + } + + ret = regmap_write(chip->regmap, ISL29028_REG_CONFIGURE, 0x0); + if (ret < 0) { + dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n", + __func__, ISL29028_REG_CONFIGURE, ret); + return ret; + } + + ret = isl29028_set_proxim_sampling(chip, chip->prox_sampling); + if (ret < 0) { + dev_err(chip->dev, "%s(): setting the proximity, err = %d\n", + __func__, ret); + return ret; + } + + ret = isl29028_set_als_scale(chip, chip->lux_scale); + if (ret < 0) + dev_err(chip->dev, "%s(): setting als scale failed, err = %d\n", + __func__, ret); + return ret; +} + +static bool is_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case ISL29028_REG_INTERRUPT: + case ISL29028_REG_PROX_DATA: + case ISL29028_REG_ALSIR_L: + case ISL29028_REG_ALSIR_U: + return true; + default: + return false; + } +} + +static const struct regmap_config isl29028_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .volatile_reg = is_volatile_reg, + .max_register = ISL29028_MAX_REGS - 1, + .num_reg_defaults_raw = ISL29028_MAX_REGS, + .cache_type = REGCACHE_RBTREE, +}; + +static int __devinit isl29028_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct isl29028_chip *chip; + struct iio_dev *indio_dev; + int ret; + + indio_dev = iio_allocate_device(sizeof(*chip)); + if (!indio_dev) { + dev_err(&client->dev, "iio allocation fails\n"); + return -ENOMEM; + } + + chip = iio_priv(indio_dev); + + i2c_set_clientdata(client, indio_dev); + chip->dev = &client->dev; + mutex_init(&chip->lock); + + chip->regmap = devm_regmap_init_i2c(client, &isl29028_regmap_config); + if (IS_ERR(chip->regmap)) { + ret = PTR_ERR(chip->regmap); + dev_err(chip->dev, "regmap initialization failed: %d\n", ret); + goto exit_iio_free; + } + + ret = isl29028_chip_init(chip); + if (ret < 0) { + dev_err(chip->dev, "chip initialization failed: %d\n", ret); + goto exit_iio_free; + } + + indio_dev->info = &isl29028_info; + indio_dev->channels = isl29028_channels; + indio_dev->num_channels = ARRAY_SIZE(isl29028_channels); + indio_dev->name = id->name; + indio_dev->dev.parent = &client->dev; + indio_dev->modes = INDIO_DIRECT_MODE; + ret = iio_device_register(indio_dev); + if (ret < 0) { + dev_err(chip->dev, "iio registration fails with error %d\n", + ret); + goto exit_iio_free; + } + return 0; + +exit_iio_free: + iio_free_device(indio_dev); + return ret; +} + +static int __devexit isl29028_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + + iio_device_unregister(indio_dev); + iio_free_device(indio_dev); + return 0; +} + +static const struct i2c_device_id isl29028_id[] = { + {"isl29028", 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, isl29028_id); + +static const struct of_device_id isl29028_of_match[] = { + { .compatible = "isl,isl29028", }, + { }, +}; +MODULE_DEVICE_TABLE(of, isl29028_of_match); + +static struct i2c_driver isl29028_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "isl29028", + .owner = THIS_MODULE, + .of_match_table = isl29028_of_match, + }, + .probe = isl29028_probe, + .remove = __devexit_p(isl29028_remove), + .id_table = isl29028_id, +}; + +module_i2c_driver(isl29028_driver); + +MODULE_DESCRIPTION("ISL29028 Ambient Light and Proximity Sensor driver"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Laxman Dewangan "); -- 1.7.1.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laxman Dewangan Subject: [PATCH V4 2/2] staging: iio: add driver for isl29028 Date: Thu, 12 Apr 2012 19:31:06 +0530 Message-ID: <1334239266-29505-3-git-send-email-ldewangan@nvidia.com> References: <1334239266-29505-1-git-send-email-ldewangan@nvidia.com> Return-path: In-Reply-To: <1334239266-29505-1-git-send-email-ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> Sender: linux-iio-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: jic23-KWPb1pKIrIJaa/9Udqfwiw@public.gmane.org, gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org, rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org, jbrenner-yYKgigLBUwlBDgjK7y7TUQ@public.gmane.org, rklein-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org, max-U9r9yeDMy7A@public.gmane.org Cc: linux-iio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devel-gWbeCf7V1WCQmaza687I9mD2FQJk+8+b@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, Laxman Dewangan List-Id: devicetree@vger.kernel.org Intersil's ISL29028 is concurrent Ambient Light and Proximity Sensor device. Add driver to access the light and IR intensity and proximity value via iio interface. Signed-off-by: Laxman Dewangan --- Changes from V1: - Taken care of cleanups comments. Changes from V2: - use the channel info for sampling frequency selection rather than exposing separate sysfs from driver. Changes from V3: - Remove sysfs range and add scale through channel info. drivers/staging/iio/light/Kconfig | 10 + drivers/staging/iio/light/Makefile | 1 + drivers/staging/iio/light/isl29028.c | 563 ++++++++++++++++++++++++++++++++++ 3 files changed, 574 insertions(+), 0 deletions(-) create mode 100644 drivers/staging/iio/light/isl29028.c diff --git a/drivers/staging/iio/light/Kconfig b/drivers/staging/iio/light/Kconfig index e7e9159..53b49f7 100644 --- a/drivers/staging/iio/light/Kconfig +++ b/drivers/staging/iio/light/Kconfig @@ -14,6 +14,16 @@ config SENSORS_ISL29018 in lux, proximity infrared sensing and normal infrared sensing. Data from sensor is accessible via sysfs. +config SENSORS_ISL29028 + tristate "Intersil ISL29028 Concurrent Light and Proximity Sensor" + depends on I2C + select REGMAP_I2C + help + Provides driver for the Intersil's ISL29028 device. + This driver supports the sysfs interface to get the ALS, IR intensity, + Proximity value via iio. The ISL29028 provides the concurrent sensing + of ambient light and proximity. + config SENSORS_TSL2563 tristate "TAOS TSL2560, TSL2561, TSL2562 and TSL2563 ambient light sensors" depends on I2C diff --git a/drivers/staging/iio/light/Makefile b/drivers/staging/iio/light/Makefile index 3011fbf..535d313 100644 --- a/drivers/staging/iio/light/Makefile +++ b/drivers/staging/iio/light/Makefile @@ -4,4 +4,5 @@ obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o obj-$(CONFIG_SENSORS_ISL29018) += isl29018.o +obj-$(CONFIG_SENSORS_ISL29028) += isl29028.o obj-$(CONFIG_TSL2583) += tsl2583.o diff --git a/drivers/staging/iio/light/isl29028.c b/drivers/staging/iio/light/isl29028.c new file mode 100644 index 0000000..faa64f7 --- /dev/null +++ b/drivers/staging/iio/light/isl29028.c @@ -0,0 +1,563 @@ +/* + * IIO driver for the light sensor ISL29028. + * ISL29028 is Concurrent Ambient Light and Proximity Sensor + * + * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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, see . + */ + +#include +#include +#include +#include +#include +#include +#include +#include "../iio.h" +#include "../sysfs.h" + +#define CONVERSION_TIME_MS 100 + +#define ISL29028_REG_CONFIGURE 0x01 + +#define CONFIGURE_ALS_IR_MODE_ALS 0 +#define CONFIGURE_ALS_IR_MODE_IR BIT(0) +#define CONFIGURE_ALS_IR_MODE_MASK BIT(0) + +#define CONFIGURE_ALS_RANGE_LOW_LUX 0 +#define CONFIGURE_ALS_RANGE_HIGH_LUX BIT(1) +#define CONFIGURE_ALS_RANGE_MASK BIT(1) + +#define CONFIGURE_ALS_DIS 0 +#define CONFIGURE_ALS_EN BIT(2) +#define CONFIGURE_ALS_EN_MASK BIT(2) + +#define CONFIGURE_PROX_DRIVE BIT(3) + +#define CONFIGURE_PROX_SLP_SH 4 +#define CONFIGURE_PROX_SLP_MASK (7 << CONFIGURE_PROX_SLP_SH) + +#define CONFIGURE_PROX_EN BIT(7) +#define CONFIGURE_PROX_EN_MASK BIT(7) + +#define ISL29028_REG_INTERRUPT 0x02 + +#define ISL29028_REG_PROX_DATA 0x08 +#define ISL29028_REG_ALSIR_L 0x09 +#define ISL29028_REG_ALSIR_U 0x0A + +#define ISL29028_REG_TEST1_MODE 0x0E +#define ISL29028_REG_TEST2_MODE 0x0F + +#define ISL29028_MAX_REGS (ISL29028_REG_TEST2_MODE + 1) + +enum als_ir_mode { + MODE_NONE = 0, + MODE_ALS, + MODE_IR +}; + +struct isl29028_chip { + struct device *dev; + struct mutex lock; + struct regmap *regmap; + + unsigned int prox_sampling; + bool enable_prox; + + int lux_scale; + int als_ir_mode; +}; + +static int isl29028_set_proxim_sampling(struct isl29028_chip *chip, + unsigned int sampling) +{ + static unsigned int prox_period[] = {800, 400, 200, 100, 75, 50, 12, 0}; + int sel; + unsigned int period = DIV_ROUND_UP(1000, sampling); + + for (sel = 0; sel < ARRAY_SIZE(prox_period); ++sel) { + if (period >= prox_period[sel]) + break; + } + return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_PROX_SLP_MASK, sel << CONFIGURE_PROX_SLP_SH); +} + +static int isl29028_enable_proximity(struct isl29028_chip *chip, bool enable) +{ + int ret; + int val = 0; + + if (enable) + val = CONFIGURE_PROX_EN; + ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_PROX_EN_MASK, val); + if (ret < 0) + return ret; + + /* Wait for conversion to be complete for first sample */ + mdelay(DIV_ROUND_UP(1000, chip->prox_sampling)); + return 0; +} + +static int isl29028_set_als_scale(struct isl29028_chip *chip, int lux_scale) +{ + int val = (lux_scale == 2000) ? CONFIGURE_ALS_RANGE_HIGH_LUX : + CONFIGURE_ALS_RANGE_LOW_LUX; + + return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_ALS_RANGE_MASK, val); +} + +static int isl29028_set_als_ir_mode(struct isl29028_chip *chip, + enum als_ir_mode mode) +{ + int ret = 0; + + switch (mode) { + case MODE_ALS: + ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_ALS_IR_MODE_MASK, CONFIGURE_ALS_IR_MODE_ALS); + if (ret < 0) + return ret; + + ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_ALS_RANGE_MASK, CONFIGURE_ALS_RANGE_HIGH_LUX); + break; + + case MODE_IR: + ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_ALS_IR_MODE_MASK, CONFIGURE_ALS_IR_MODE_IR); + break; + + case MODE_NONE: + return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_ALS_EN_MASK, CONFIGURE_ALS_DIS); + } + + if (ret < 0) + return ret; + + /* Enable the ALS/IR */ + ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE, + CONFIGURE_ALS_EN_MASK, CONFIGURE_ALS_EN); + if (ret < 0) + return ret; + + /* Need to wait for conversion time if ALS/IR mode enabled */ + mdelay(CONVERSION_TIME_MS); + return 0; +} + +static int isl29028_read_als_ir(struct isl29028_chip *chip, int *als_ir) +{ + unsigned int lsb; + unsigned int msb; + int ret; + + ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_L, &lsb); + if (ret < 0) { + dev_err(chip->dev, + "Error in reading register ALSIR_L err %d\n", ret); + return ret; + } + + ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_U, &msb); + if (ret < 0) { + dev_err(chip->dev, + "Error in reading register ALSIR_U err %d\n", ret); + return ret; + } + + *als_ir = ((msb & 0xF) << 8) | (lsb & 0xFF); + return 0; +} + +static int isl29028_read_proxim(struct isl29028_chip *chip, int *prox) +{ + unsigned int data; + int ret; + + ret = regmap_read(chip->regmap, ISL29028_REG_PROX_DATA, &data); + if (ret < 0) { + dev_err(chip->dev, "Error in reading register %d, error %d\n", + ISL29028_REG_PROX_DATA, ret); + return ret; + } + *prox = data; + return 0; +} + +static int isl29028_proxim_get(struct isl29028_chip *chip, int *prox_data) +{ + int ret; + + if (!chip->enable_prox) { + ret = isl29028_enable_proximity(chip, true); + if (ret < 0) + return ret; + chip->enable_prox = true; + } + return isl29028_read_proxim(chip, prox_data); +} + +static int isl29028_als_get(struct isl29028_chip *chip, int *als_data) +{ + int ret; + int als_ir_data; + + if (chip->als_ir_mode != MODE_ALS) { + ret = isl29028_set_als_ir_mode(chip, MODE_ALS); + if (ret < 0) { + dev_err(chip->dev, + "Error in enabling ALS mode err %d\n", ret); + return ret; + } + chip->als_ir_mode = MODE_ALS; + } + + ret = isl29028_read_als_ir(chip, &als_ir_data); + if (ret < 0) + return ret; + + /* + * convert als data count to lux. + * if lux_scale = 125, lux = count * 0.031 + * if lux_scale = 2000, lux = count * 0.49 + */ + if (chip->lux_scale == 125) + als_ir_data = (als_ir_data * 31) / 1000; + else + als_ir_data = (als_ir_data * 49) / 100; + + *als_data = als_ir_data; + return 0; +} + +static int isl29028_ir_get(struct isl29028_chip *chip, int *ir_data) +{ + int ret; + + if (chip->als_ir_mode != MODE_IR) { + ret = isl29028_set_als_ir_mode(chip, MODE_IR); + if (ret < 0) { + dev_err(chip->dev, + "Error in enabling IR mode err %d\n", ret); + return ret; + } + chip->als_ir_mode = MODE_IR; + } + return isl29028_read_als_ir(chip, ir_data); +} + +/* Channel IO */ +static int isl29028_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int val, int val2, long mask) +{ + struct isl29028_chip *chip = iio_priv(indio_dev); + int ret = -EINVAL; + + mutex_lock(&chip->lock); + switch (chan->type) { + case IIO_PROXIMITY: + if (mask != IIO_CHAN_INFO_SAMP_FREQ_SEPARATE_BIT) { + dev_err(chip->dev, + "proximity: mask value 0x%08lx not supported\n", + mask); + break; + } + if (val < 1 || val > 100) { + dev_err(chip->dev, + "Samp_freq %d is not in range[1:100]\n", val); + break; + } + ret = isl29028_set_proxim_sampling(chip, val); + if (ret < 0) { + dev_err(chip->dev, + "Setting proximity samp_freq fail, err %d\n", + ret); + break; + } + chip->prox_sampling = val; + break; + + case IIO_LIGHT: + if (mask != IIO_CHAN_INFO_SCALE_SEPARATE_BIT) { + dev_err(chip->dev, + "light: mask value 0x%08lx not supported\n", + mask); + break; + } + if ((val != 125) && (val != 2000)) { + dev_err(chip->dev, + "lux scale %d is invalid [125, 2000]\n", val); + break; + } + ret = isl29028_set_als_scale(chip, val); + if (ret < 0) { + dev_err(chip->dev, + "Setting lux scale fail with error %d\n", ret); + break; + } + chip->lux_scale = val; + break; + + default: + dev_err(chip->dev, "Unsupported channel type\n"); + break; + } + mutex_unlock(&chip->lock); + return ret; +} + +static int isl29028_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, int *val2, long mask) +{ + struct isl29028_chip *chip = iio_priv(indio_dev); + int ret = -EINVAL; + + mutex_lock(&chip->lock); + switch (mask) { + case 0: + switch (chan->type) { + case IIO_LIGHT: + ret = isl29028_als_get(chip, val); + break; + case IIO_INTENSITY: + ret = isl29028_ir_get(chip, val); + break; + case IIO_PROXIMITY: + ret = isl29028_proxim_get(chip, val); + break; + default: + break; + } + if (ret < 0) + break; + ret = IIO_VAL_INT; + break; + + case IIO_CHAN_INFO_SAMP_FREQ_SEPARATE_BIT: + if (chan->type != IIO_PROXIMITY) + break; + *val = chip->prox_sampling; + ret = IIO_VAL_INT; + break; + + case IIO_CHAN_INFO_SCALE_SEPARATE_BIT: + if (chan->type != IIO_LIGHT) + break; + *val = chip->lux_scale; + ret = IIO_VAL_INT; + break; + + default: + dev_err(chip->dev, "mask value 0x%08lx not supported\n", mask); + break; + } + mutex_unlock(&chip->lock); + return ret; +} + +static IIO_CONST_ATTR(proximity_sampling_frequency_available, + "1, 3, 5, 10, 13, 20, 83, 100"); +static IIO_CONST_ATTR(illuminance_scale_available, "125, 2000"); + +#define ISL29028_DEV_ATTR(name) (&iio_dev_attr_##name.dev_attr.attr) +#define ISL29028_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr) +static struct attribute *isl29028_attributes[] = { + ISL29028_CONST_ATTR(proximity_sampling_frequency_available), + ISL29028_CONST_ATTR(illuminance_scale_available), + NULL, +}; + +static const struct attribute_group isl29108_group = { + .attrs = isl29028_attributes, +}; + +static const struct iio_chan_spec isl29028_channels[] = { + { + .type = IIO_LIGHT, + .processed_val = 1, + .info_mask = IIO_CHAN_INFO_SCALE_SEPARATE_BIT, + }, { + .type = IIO_INTENSITY, + }, { + .type = IIO_PROXIMITY, + .info_mask = IIO_CHAN_INFO_SAMP_FREQ_SEPARATE_BIT, + } +}; + +static const struct iio_info isl29028_info = { + .attrs = &isl29108_group, + .driver_module = THIS_MODULE, + .read_raw = &isl29028_read_raw, + .write_raw = &isl29028_write_raw, +}; + +static int isl29028_chip_init(struct isl29028_chip *chip) +{ + int ret; + + chip->enable_prox = false; + chip->prox_sampling = 20; + chip->lux_scale = 2000; + chip->als_ir_mode = MODE_NONE; + + ret = regmap_write(chip->regmap, ISL29028_REG_TEST1_MODE, 0x0); + if (ret < 0) { + dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n", + __func__, ISL29028_REG_TEST1_MODE, ret); + return ret; + } + ret = regmap_write(chip->regmap, ISL29028_REG_TEST2_MODE, 0x0); + if (ret < 0) { + dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n", + __func__, ISL29028_REG_TEST2_MODE, ret); + return ret; + } + + ret = regmap_write(chip->regmap, ISL29028_REG_CONFIGURE, 0x0); + if (ret < 0) { + dev_err(chip->dev, "%s(): write to reg %d failed, err = %d\n", + __func__, ISL29028_REG_CONFIGURE, ret); + return ret; + } + + ret = isl29028_set_proxim_sampling(chip, chip->prox_sampling); + if (ret < 0) { + dev_err(chip->dev, "%s(): setting the proximity, err = %d\n", + __func__, ret); + return ret; + } + + ret = isl29028_set_als_scale(chip, chip->lux_scale); + if (ret < 0) + dev_err(chip->dev, "%s(): setting als scale failed, err = %d\n", + __func__, ret); + return ret; +} + +static bool is_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case ISL29028_REG_INTERRUPT: + case ISL29028_REG_PROX_DATA: + case ISL29028_REG_ALSIR_L: + case ISL29028_REG_ALSIR_U: + return true; + default: + return false; + } +} + +static const struct regmap_config isl29028_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .volatile_reg = is_volatile_reg, + .max_register = ISL29028_MAX_REGS - 1, + .num_reg_defaults_raw = ISL29028_MAX_REGS, + .cache_type = REGCACHE_RBTREE, +}; + +static int __devinit isl29028_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct isl29028_chip *chip; + struct iio_dev *indio_dev; + int ret; + + indio_dev = iio_allocate_device(sizeof(*chip)); + if (!indio_dev) { + dev_err(&client->dev, "iio allocation fails\n"); + return -ENOMEM; + } + + chip = iio_priv(indio_dev); + + i2c_set_clientdata(client, indio_dev); + chip->dev = &client->dev; + mutex_init(&chip->lock); + + chip->regmap = devm_regmap_init_i2c(client, &isl29028_regmap_config); + if (IS_ERR(chip->regmap)) { + ret = PTR_ERR(chip->regmap); + dev_err(chip->dev, "regmap initialization failed: %d\n", ret); + goto exit_iio_free; + } + + ret = isl29028_chip_init(chip); + if (ret < 0) { + dev_err(chip->dev, "chip initialization failed: %d\n", ret); + goto exit_iio_free; + } + + indio_dev->info = &isl29028_info; + indio_dev->channels = isl29028_channels; + indio_dev->num_channels = ARRAY_SIZE(isl29028_channels); + indio_dev->name = id->name; + indio_dev->dev.parent = &client->dev; + indio_dev->modes = INDIO_DIRECT_MODE; + ret = iio_device_register(indio_dev); + if (ret < 0) { + dev_err(chip->dev, "iio registration fails with error %d\n", + ret); + goto exit_iio_free; + } + return 0; + +exit_iio_free: + iio_free_device(indio_dev); + return ret; +} + +static int __devexit isl29028_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + + iio_device_unregister(indio_dev); + iio_free_device(indio_dev); + return 0; +} + +static const struct i2c_device_id isl29028_id[] = { + {"isl29028", 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, isl29028_id); + +static const struct of_device_id isl29028_of_match[] = { + { .compatible = "isl,isl29028", }, + { }, +}; +MODULE_DEVICE_TABLE(of, isl29028_of_match); + +static struct i2c_driver isl29028_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "isl29028", + .owner = THIS_MODULE, + .of_match_table = isl29028_of_match, + }, + .probe = isl29028_probe, + .remove = __devexit_p(isl29028_remove), + .id_table = isl29028_id, +}; + +module_i2c_driver(isl29028_driver); + +MODULE_DESCRIPTION("ISL29028 Ambient Light and Proximity Sensor driver"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Laxman Dewangan "); -- 1.7.1.1