From patchwork Wed Feb 14 14:58:05 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff LaBundy X-Patchwork-Id: 10219213 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D7BE660467 for ; Wed, 14 Feb 2018 15:06:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C817128B56 for ; Wed, 14 Feb 2018 15:06:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BC84628FC9; Wed, 14 Feb 2018 15:06:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9B46328B56 for ; Wed, 14 Feb 2018 15:06:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030798AbeBNPG2 (ORCPT ); Wed, 14 Feb 2018 10:06:28 -0500 Received: from p3plsmtpa08-04.prod.phx3.secureserver.net ([173.201.193.105]:34023 "EHLO p3plsmtpa08-04.prod.phx3.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030382AbeBNPG1 (ORCPT ); Wed, 14 Feb 2018 10:06:27 -0500 X-Greylist: delayed 439 seconds by postgrey-1.27 at vger.kernel.org; Wed, 14 Feb 2018 10:06:27 EST Received: from localhost.localdomain ([136.62.165.143]) by :SMTPAUTH: with SMTP id lyWOeHzm6xgOdlyWZeIWJv; Wed, 14 Feb 2018 07:59:08 -0700 From: Jeff LaBundy To: jic23@kernel.org Cc: knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, linux-iio@vger.kernel.org, Jeff LaBundy Subject: [PATCH] iio: light: lv0104cs: Add support for LV0104CS light sensor Date: Wed, 14 Feb 2018 08:58:05 -0600 Message-Id: <1518620285-1893-1-git-send-email-jeff@labundy.com> X-Mailer: git-send-email 2.7.4 X-CMAE-Envelope: MS4wfDy+BMHd+i6d/OZhdm1G8C8IY45JClk+NjqVzz/T++ilOe3Z95p1wIX8TCDm/awl3sJPqkBYMAO1WMblay7VZvc3Wkz8UNIN95EXiLGsiGzLU3cq+UvL /N8RgZNOcDyhDF70mMoLHR9Y67Wakq5vb9Cf5TIl/p4BSAPvthrLFeu4F3y/1eNv+Aa4n9te+UpoC4lrbXPxcidnYxnPAMgpCmiIS3RMM3rviwSQNQo6/Nq7 zcIKny36JGTtgaASYmo8Bfl12wbo7qy2HGC7H5FSE/gaXQc9oy0I5YdWtsHLSAcw2sOyot5cbl8azF3r28t/MA== Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds support for the On Semiconductor LV0104CS ambient light sensor. Signed-off-by: Jeff LaBundy --- drivers/iio/light/Kconfig | 10 + drivers/iio/light/Makefile | 1 + drivers/iio/light/lv0104cs.c | 559 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 570 insertions(+) create mode 100644 drivers/iio/light/lv0104cs.c diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index 2356ed9..ca8918e 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -275,6 +275,16 @@ config LTR501 This driver can also be built as a module. If so, the module will be called ltr501. +config LV0104CS + tristate "LV0104CS Ambient Light Sensor" + depends on I2C + help + Say Y here if you want to build support for the LV0104CS ambient + light sensor. + + To compile this driver as a module, choose M here: + the module will be called lv0104cs. + config MAX44000 tristate "MAX44000 Ambient and Infrared Proximity Sensor" depends on I2C diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile index fa32fa4..77c8682 100644 --- a/drivers/iio/light/Makefile +++ b/drivers/iio/light/Makefile @@ -25,6 +25,7 @@ obj-$(CONFIG_ISL29125) += isl29125.o obj-$(CONFIG_JSA1212) += jsa1212.o obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o obj-$(CONFIG_LTR501) += ltr501.o +obj-$(CONFIG_LV0104CS) += lv0104cs.o obj-$(CONFIG_MAX44000) += max44000.o obj-$(CONFIG_OPT3001) += opt3001.o obj-$(CONFIG_PA12203001) += pa12203001.o diff --git a/drivers/iio/light/lv0104cs.c b/drivers/iio/light/lv0104cs.c new file mode 100644 index 0000000..ecbba39 --- /dev/null +++ b/drivers/iio/light/lv0104cs.c @@ -0,0 +1,559 @@ +/* + * lv0104cs.c: LV0104CS Ambient Light Sensor Driver + * + * Copyright (C) 2018 Jeff LaBundy + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 of the License + * as published by the Free Software Foundation. + * + * 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. + * + * 7-bit I2C slave address: 0x13 + * + * This device has just one register and it is write-only. Read operations are + * limited to the 16-bit ADC output. + * + */ + +#include +#include +#include +#include +#include +#include +#include + +#define LV0104CS_REGVAL_MEASURE 0xE0 +#define LV0104CS_REGVAL_SLEEP 0x00 + +#define LV0104CS_HWGAIN_0x25 0 +#define LV0104CS_HWGAIN_1x 1 +#define LV0104CS_HWGAIN_2x 2 +#define LV0104CS_HWGAIN_8x 3 + +#define LV0104CS_INTEG_12m5 0 +#define LV0104CS_INTEG_100m 1 +#define LV0104CS_INTEG_200m 2 + +#define LV0104CS_CALIB_UNITY 31 + +struct lv0104cs_private { + struct i2c_client *client; + struct mutex lock; + unsigned char hardwaregain; + unsigned char int_time; + unsigned char calibscale; +}; + +struct lv0104cs_mapping { + int val; + int val2; + unsigned char regval; +}; + +static const struct lv0104cs_mapping lv0104cs_calibscales[] = { + { 0, 666666, 0x81 }, + { 0, 800000, 0x82 }, + { 0, 857142, 0x83 }, + { 0, 888888, 0x84 }, + { 0, 909090, 0x85 }, + { 0, 923076, 0x86 }, + { 0, 933333, 0x87 }, + { 0, 941176, 0x88 }, + { 0, 947368, 0x89 }, + { 0, 952380, 0x8A }, + { 0, 956521, 0x8B }, + { 0, 960000, 0x8C }, + { 0, 962962, 0x8D }, + { 0, 965517, 0x8E }, + { 0, 967741, 0x8F }, + { 0, 969696, 0x90 }, + { 0, 971428, 0x91 }, + { 0, 972972, 0x92 }, + { 0, 974358, 0x93 }, + { 0, 975609, 0x94 }, + { 0, 976744, 0x95 }, + { 0, 977777, 0x96 }, + { 0, 978723, 0x97 }, + { 0, 979591, 0x98 }, + { 0, 980392, 0x99 }, + { 0, 981132, 0x9A }, + { 0, 981818, 0x9B }, + { 0, 982456, 0x9C }, + { 0, 983050, 0x9D }, + { 0, 983606, 0x9E }, + { 0, 984126, 0x9F }, + { 1, 0, 0x80 }, + { 1, 16129, 0xBF }, + { 1, 16666, 0xBE }, + { 1, 17241, 0xBD }, + { 1, 17857, 0xBC }, + { 1, 18518, 0xBB }, + { 1, 19230, 0xBA }, + { 1, 20000, 0xB9 }, + { 1, 20833, 0xB8 }, + { 1, 21739, 0xB7 }, + { 1, 22727, 0xB6 }, + { 1, 23809, 0xB5 }, + { 1, 24999, 0xB4 }, + { 1, 26315, 0xB3 }, + { 1, 27777, 0xB2 }, + { 1, 29411, 0xB1 }, + { 1, 31250, 0xB0 }, + { 1, 33333, 0xAF }, + { 1, 35714, 0xAE }, + { 1, 38461, 0xAD }, + { 1, 41666, 0xAC }, + { 1, 45454, 0xAB }, + { 1, 50000, 0xAA }, + { 1, 55555, 0xA9 }, + { 1, 62500, 0xA8 }, + { 1, 71428, 0xA7 }, + { 1, 83333, 0xA6 }, + { 1, 100000, 0xA5 }, + { 1, 125000, 0xA4 }, + { 1, 166666, 0xA3 }, + { 1, 250000, 0xA2 }, + { 1, 500000, 0xA1 }, +}; + +static const struct lv0104cs_mapping lv0104cs_hardwaregains[] = { + { 0, 250000, 0x00 }, + { 1, 0, 0x08 }, + { 2, 0, 0x10 }, + { 8, 0, 0x18 }, +}; + +static const struct lv0104cs_mapping lv0104cs_int_times[] = { + { 0, 12500, 0x00 }, + { 0, 100000, 0x02 }, + { 0, 200000, 0x04 }, +}; + +static int lv0104cs_write_reg(struct lv0104cs_private *lv0104cs, + unsigned char regval) +{ + struct i2c_client *client = lv0104cs->client; + int ret; + + ret = i2c_master_send(client, ®val, 1); + if (ret != 1) { + dev_err(&client->dev, "Failed to write to device: %d\n", ret); + return ret; + } + + return 0; +} + +static int lv0104cs_read_adc(struct lv0104cs_private *lv0104cs, + unsigned int *adc_output) +{ + struct i2c_client *client = lv0104cs->client; + unsigned char regval[2]; + int ret; + + ret = i2c_master_recv(client, regval, 2); + if (ret != 2) { + dev_err(&client->dev, "Failed to read from device: %d\n", ret); + return ret; + } + + *adc_output = (regval[0] << 8) + regval[1]; + + return 0; +} + +static int lv0104cs_get_lux(struct lv0104cs_private *lv0104cs, + unsigned int *val, unsigned int *val2) +{ + unsigned char regval = LV0104CS_REGVAL_MEASURE; + unsigned int adc_output; + int ret; + + /* this function expects to be called while mutex is locked */ + if (!mutex_is_locked(&lv0104cs->lock)) + return -EACCES; + + regval |= lv0104cs_hardwaregains[lv0104cs->hardwaregain].regval; + regval |= lv0104cs_int_times[lv0104cs->int_time].regval; + ret = lv0104cs_write_reg(lv0104cs, regval); + if (ret) + return ret; + + /* wait for integration time to pass (with margin) */ + switch (lv0104cs->int_time) { + case LV0104CS_INTEG_12m5: + msleep(50); + break; + + case LV0104CS_INTEG_100m: + msleep(150); + break; + + case LV0104CS_INTEG_200m: + msleep(250); + break; + + default: + return -EINVAL; + } + + ret = lv0104cs_read_adc(lv0104cs, &adc_output); + if (ret) + return ret; + + ret = lv0104cs_write_reg(lv0104cs, LV0104CS_REGVAL_SLEEP); + if (ret) + return ret; + + /* normalize to lux based on applied gain */ + switch (lv0104cs->hardwaregain) { + case LV0104CS_HWGAIN_0x25: + *val = adc_output * 4; + *val2 = 0; + break; + + case LV0104CS_HWGAIN_1x: + *val = adc_output; + *val2 = 0; + break; + + case LV0104CS_HWGAIN_2x: + *val = adc_output / 2; + *val2 = (adc_output % 2) * 500000; + break; + + case LV0104CS_HWGAIN_8x: + *val = adc_output / 8; + *val2 = (adc_output % 8) * 125000; + break; + + default: + return -EINVAL; + } + + return 0; +} + +static int lv0104cs_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct lv0104cs_private *lv0104cs = iio_priv(indio_dev); + int ret; + + if (chan->type != IIO_LIGHT) + return -EINVAL; + + mutex_lock(&lv0104cs->lock); + + switch (mask) { + case IIO_CHAN_INFO_PROCESSED: + ret = lv0104cs_get_lux(lv0104cs, val, val2); + if (ret) + goto err_mutex; + ret = IIO_VAL_INT_PLUS_MICRO; + break; + + case IIO_CHAN_INFO_CALIBSCALE: + *val = lv0104cs_calibscales[lv0104cs->calibscale].val; + *val2 = lv0104cs_calibscales[lv0104cs->calibscale].val2; + ret = IIO_VAL_INT_PLUS_MICRO; + break; + + case IIO_CHAN_INFO_HARDWAREGAIN: + *val = lv0104cs_hardwaregains[lv0104cs->hardwaregain].val; + *val2 = lv0104cs_hardwaregains[lv0104cs->hardwaregain].val2; + ret = IIO_VAL_INT_PLUS_MICRO; + break; + + case IIO_CHAN_INFO_INT_TIME: + *val = lv0104cs_int_times[lv0104cs->int_time].val; + *val2 = lv0104cs_int_times[lv0104cs->int_time].val2; + ret = IIO_VAL_INT_PLUS_MICRO; + break; + + default: + ret = -EINVAL; + } + +err_mutex: + mutex_unlock(&lv0104cs->lock); + + return ret; +} + +static int lv0104cs_set_calibscale(struct lv0104cs_private *lv0104cs, + int val, int val2) +{ + int calibscale = val * 1000000 + val2; + int floor, ceil, mid; + int ret, i, index; + + /* round to nearest quantized sensitivity */ + for (i = 0; i < ARRAY_SIZE(lv0104cs_calibscales) - 1; i++) { + floor = lv0104cs_calibscales[i].val * 1000000 + + lv0104cs_calibscales[i].val2; + ceil = lv0104cs_calibscales[i + 1].val * 1000000 + + lv0104cs_calibscales[i + 1].val2; + mid = (floor + ceil) / 2; + + /* round down */ + if (calibscale >= floor && calibscale < mid) { + index = i; + break; + } + + /* round up */ + if (calibscale >= mid && calibscale <= ceil) { + index = i + 1; + break; + } + } + + if (i == ARRAY_SIZE(lv0104cs_calibscales) - 1) + return -EINVAL; + + /* set sensitivity */ + ret = lv0104cs_write_reg(lv0104cs, lv0104cs_calibscales[index].regval); + if (ret) + return ret; + + mutex_lock(&lv0104cs->lock); + lv0104cs->calibscale = index; + mutex_unlock(&lv0104cs->lock); + + return 0; +} + +static int lv0104cs_set_hardwaregain(struct lv0104cs_private *lv0104cs, + int val, int val2) +{ + int i; + + /* hard matching */ + for (i = 0; i < ARRAY_SIZE(lv0104cs_hardwaregains); i++) { + if (val != lv0104cs_hardwaregains[i].val) + continue; + + if (val2 == lv0104cs_hardwaregains[i].val2) + break; + } + + if (i == ARRAY_SIZE(lv0104cs_hardwaregains)) + return -EINVAL; + + mutex_lock(&lv0104cs->lock); + lv0104cs->hardwaregain = i; + mutex_unlock(&lv0104cs->lock); + + return 0; +} + +static int lv0104cs_set_int_time(struct lv0104cs_private *lv0104cs, + int val, int val2) +{ + int i; + + /* hard matching */ + for (i = 0; i < ARRAY_SIZE(lv0104cs_int_times); i++) { + if (val != lv0104cs_int_times[i].val) + continue; + + if (val2 == lv0104cs_int_times[i].val2) + break; + } + + if (i == ARRAY_SIZE(lv0104cs_int_times)) + return -EINVAL; + + mutex_lock(&lv0104cs->lock); + lv0104cs->int_time = i; + mutex_unlock(&lv0104cs->lock); + + return 0; +} + +static int lv0104cs_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct lv0104cs_private *lv0104cs = iio_priv(indio_dev); + int ret; + + if (chan->type != IIO_LIGHT) + return -EINVAL; + + switch (mask) { + case IIO_CHAN_INFO_CALIBSCALE: + ret = lv0104cs_set_calibscale(lv0104cs, val, val2); + break; + + case IIO_CHAN_INFO_HARDWAREGAIN: + ret = lv0104cs_set_hardwaregain(lv0104cs, val, val2); + break; + + case IIO_CHAN_INFO_INT_TIME: + ret = lv0104cs_set_int_time(lv0104cs, val, val2); + break; + + default: + ret = -EINVAL; + } + + return ret; +} + +static ssize_t lv0104cs_show_calibscale_avail(struct device *dev, + struct device_attribute *attr, char *buf) +{ + ssize_t len = 0; + int i; + + for (i = 0; i < ARRAY_SIZE(lv0104cs_calibscales); i++) { + len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ", + lv0104cs_calibscales[i].val, + lv0104cs_calibscales[i].val2); + } + + buf[len - 1] = '\n'; + + return len; +} + +static ssize_t lv0104cs_show_hardwaregain_avail(struct device *dev, + struct device_attribute *attr, char *buf) +{ + ssize_t len = 0; + int i; + + for (i = 0; i < ARRAY_SIZE(lv0104cs_hardwaregains); i++) { + len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ", + lv0104cs_hardwaregains[i].val, + lv0104cs_hardwaregains[i].val2); + } + + buf[len - 1] = '\n'; + + return len; +} + +static ssize_t lv0104cs_show_int_time_avail(struct device *dev, + struct device_attribute *attr, char *buf) +{ + ssize_t len = 0; + int i; + + for (i = 0; i < ARRAY_SIZE(lv0104cs_int_times); i++) { + len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ", + lv0104cs_int_times[i].val, + lv0104cs_int_times[i].val2); + } + + buf[len - 1] = '\n'; + + return len; +} + +static IIO_DEVICE_ATTR(calibscale_available, 0444, + lv0104cs_show_calibscale_avail, NULL, 0); +static IIO_DEVICE_ATTR(hardwaregain_available, 0444, + lv0104cs_show_hardwaregain_avail, NULL, 0); +static IIO_DEV_ATTR_INT_TIME_AVAIL(lv0104cs_show_int_time_avail); + +static struct attribute *lv0104cs_attributes[] = { + &iio_dev_attr_calibscale_available.dev_attr.attr, + &iio_dev_attr_hardwaregain_available.dev_attr.attr, + &iio_dev_attr_integration_time_available.dev_attr.attr, + NULL +}; + +static const struct attribute_group lv0104cs_attribute_group = { + .attrs = lv0104cs_attributes, +}; + +static const struct iio_info lv0104cs_info = { + .attrs = &lv0104cs_attribute_group, + .read_raw = &lv0104cs_read_raw, + .write_raw = &lv0104cs_write_raw, +}; + +static const struct iio_chan_spec lv0104cs_channels[] = { + { + .type = IIO_LIGHT, + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | + BIT(IIO_CHAN_INFO_CALIBSCALE) | + BIT(IIO_CHAN_INFO_HARDWAREGAIN) | + BIT(IIO_CHAN_INFO_INT_TIME), + }, +}; + +static int lv0104cs_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct iio_dev *indio_dev; + struct device *dev = &client->dev; + struct lv0104cs_private *lv0104cs; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(struct lv0104cs_private)); + if (!indio_dev) + return -ENOMEM; + + lv0104cs = iio_priv(indio_dev); + + i2c_set_clientdata(client, lv0104cs); + lv0104cs->client = client; + + mutex_init(&lv0104cs->lock); + + lv0104cs->hardwaregain = LV0104CS_HWGAIN_1x; + lv0104cs->int_time = LV0104CS_INTEG_200m; + lv0104cs->calibscale = LV0104CS_CALIB_UNITY; + + ret = lv0104cs_write_reg(lv0104cs, + lv0104cs_calibscales[LV0104CS_CALIB_UNITY].regval); + if (ret) + return -ENODEV; + + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->dev.parent = dev; + indio_dev->channels = lv0104cs_channels; + indio_dev->num_channels = ARRAY_SIZE(lv0104cs_channels); + indio_dev->name = client->name; + indio_dev->info = &lv0104cs_info; + + ret = devm_iio_device_register(dev, indio_dev); + if (ret) { + dev_err(dev, "Failed to register device: %d\n", ret); + return ret; + } + + dev_info(dev, "Successfully registered device\n"); + + return 0; +} + +static const struct i2c_device_id lv0104cs_id[] = { + { "lv0104cs", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, lv0104cs_id); + +static struct i2c_driver lv0104cs_i2c_driver = { + .driver = { + .name = "lv0104cs", + }, + + .id_table = lv0104cs_id, + .probe = lv0104cs_probe, +}; +module_i2c_driver(lv0104cs_i2c_driver); + +MODULE_AUTHOR("Jeff LaBundy "); +MODULE_DESCRIPTION("LV0104CS Ambient Light Sensor Driver"); +MODULE_LICENSE("GPL v2");