Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755546Ab0DNNY1 (ORCPT ); Wed, 14 Apr 2010 09:24:27 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:34979 "EHLO bob.linux.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750939Ab0DNNYY (ORCPT ); Wed, 14 Apr 2010 09:24:24 -0400 From: Alan Cox Subject: [PATCH 2/4] isl29020: ambient light sensor To: linux-i2c@vger.kernel.org, khali@linux-fr.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 14 Apr 2010 13:51:49 +0100 Message-ID: <20100414125147.23181.5817.stgit@localhost.localdomain> In-Reply-To: <20100414124913.23181.75903.stgit@localhost.localdomain> References: <20100414124913.23181.75903.stgit@localhost.localdomain> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8749 Lines: 303 From: Kalhan Trisal The LS driver will read the latest Lux measurement based upon the light brightness and will report the LUX output through sysfs interface. Signed-off-by: Kalhan Trisal Signed-off-by: Alan Cox --- drivers/hwmon/Kconfig | 9 ++ drivers/hwmon/Makefile | 1 drivers/hwmon/isl29020.c | 243 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 253 insertions(+), 0 deletions(-) create mode 100644 drivers/hwmon/isl29020.c diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 74f672d..1fa2533 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1095,6 +1095,15 @@ config SENSORS_HMC6352 This driver provides support for the Honeywell HMC6352 compass, providing configuration and heading data via sysfs. +config SENSORS_ISL29020 + tristate "Intersil ISL29020 ALS" + depends on I2C + help + If you say yes here you get support for the ALS Devices + Ambient Light Sensor monitoring chip. + Range values can be configured using sysfs. + Lux data is accessible via sysfs. + if ACPI comment "ACPI drivers" diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index ad2ed36..13d6832 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -53,6 +53,7 @@ obj-$(CONFIG_SENSORS_HMC6352) += hmc6352.o obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o +obj-$(CONFIG_SENSORS_ISL29020) += isl29020.o obj-$(CONFIG_SENSORS_IT87) += it87.o obj-$(CONFIG_SENSORS_K8TEMP) += k8temp.o obj-$(CONFIG_SENSORS_K10TEMP) += k10temp.o diff --git a/drivers/hwmon/isl29020.c b/drivers/hwmon/isl29020.c new file mode 100644 index 0000000..458140d --- /dev/null +++ b/drivers/hwmon/isl29020.c @@ -0,0 +1,243 @@ +/* + * isl29020.c - Intersil ALS Driver + * + * Copyright (C) 2008 Intel Corp + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * 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; version 2 of the License. + * + * 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., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#define ALS_MIN_RANGE_VAL 0 +#define ALS_MAX_RANGE_VAL 5 + +struct als_data { + struct device *hwmon_dev; +}; + +static unsigned int i2c_write_current_data(struct i2c_client *client, + unsigned int reg, unsigned int value) +{ + int ret_val; + + ret_val = i2c_smbus_write_byte_data(client, reg, value); + return ret_val; +} + +static ssize_t als_sensing_range_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + int val; + + val = i2c_smbus_read_byte_data(client, 0x00); + return sprintf(buf, "%d000\n", 1 << (2 * (val & 3))); + +} + +static ssize_t als_lux_output_data_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + unsigned int ret_val, val; + unsigned long int lux, max_count; + int tempv1, tempv2; + + max_count = 65535; + tempv1 = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */ + tempv2 = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */ + ret_val = tempv1; + ret_val = (ret_val << 8 | tempv2); + val = i2c_smbus_read_byte_data(client, 0x00); + lux = ((((1 << (2 * (val & 3))))*1000) * ret_val) / max_count; + return sprintf(buf, "%ld\n", lux); +} + +static ssize_t als_sensing_range_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + unsigned int ret_val, set_val = 0; + unsigned long val; + + if (strict_strtoul(buf, 10, &val)) + return -EINVAL; + ret_val = i2c_smbus_read_byte_data(client, 0x00); + ret_val = ret_val & 0xFC; /*reset the bit before setting them */ + if (val == 1) + set_val = (ret_val | 0x00); /* setting the 1:0 bit */ + else if (val == 2) + set_val = (ret_val | 0x01); + else if (val == 3) + set_val = (ret_val | 0x02); + else if (val == 4) + set_val = (ret_val | 0x03); + else + goto invarg; + i2c_write_current_data(client, 0x00, set_val); + return count; +invarg: + return -EINVAL; +} + +static ssize_t als_power_status_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct i2c_client *client = to_i2c_client(dev); + int ret_val; + + ret_val = i2c_smbus_read_byte_data(client, 0x00); + ret_val = ret_val & 0x80; + if (ret_val == 0x80) + ret_val = 1; + return sprintf(buf, "%x", ret_val); +} + +static ssize_t als_power_status_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + unsigned long val = 0; + char curr_val; + + if (strict_strtoul(buf, 10, &val)) + return -EINVAL; + + curr_val = i2c_smbus_read_byte_data(client, 0x00); + if (val == 1) + curr_val = curr_val | 0x80; + else if (val == 0) + curr_val = curr_val & 0x7F; + else + return -EINVAL; + i2c_write_current_data(client, 0x00, curr_val); + return count; +} + +static DEVICE_ATTR(sensing_range, S_IRUGO | S_IWUSR, + als_sensing_range_show, als_sensing_range_store); +static DEVICE_ATTR(lux_output, S_IRUGO, als_lux_output_data_show, NULL); +static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, + als_power_status_show, als_power_status_store); + +static struct attribute *mid_att_als[] = { + &dev_attr_sensing_range.attr, + &dev_attr_lux_output.attr, + &dev_attr_power_state.attr, + NULL +}; + +static struct attribute_group m_als_gr = { + .name = "isl29020", + .attrs = mid_att_als +}; + +static void als_set_default_config(struct i2c_client *client) +{ + i2c_write_current_data(client, 0x00, 0xc0); +} + +static int isl29020_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int res; + struct als_data *data; + + data = kzalloc(sizeof(struct als_data), GFP_KERNEL); + if (data == NULL) { + printk(KERN_WARNING " isl29020: out of memory"); + return -ENOMEM; + } + i2c_set_clientdata(client, data); + + res = sysfs_create_group(&client->dev.kobj, &m_als_gr); + if (res) { + printk(KERN_WARNING "isl29020: device create file failed!!\n"); + goto als_error1; + } + data->hwmon_dev = hwmon_device_register(&client->dev); + if (IS_ERR(data->hwmon_dev)) { + res = PTR_ERR(data->hwmon_dev); + data->hwmon_dev = NULL; + sysfs_remove_group(&client->dev.kobj, &m_als_gr); + printk(KERN_ERR "isl29020:unable to register hwmon device\n"); + goto als_error1; + } + dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name); + als_set_default_config(client); + return res; + +als_error1: + i2c_set_clientdata(client, NULL); + kfree(data); + return res; +} + +static int isl29020_remove(struct i2c_client *client) +{ + struct als_data *data = i2c_get_clientdata(client); + + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&client->dev.kobj, &m_als_gr); + kfree(data); + return 0; +} + +static struct i2c_device_id isl29020_id[] = { + { "i2c_als", 0 }, + { } +}; + +MODULE_DEVICE_TABLE(i2c, isl29020_id); + +static struct i2c_driver isl29020_driver = { + .driver = { + .name = "isl29020", + }, + .probe = isl29020_probe, + .remove = isl29020_remove, + .id_table = isl29020_id, +}; + +static int __init sensor_isl29020_init(void) +{ + return i2c_add_driver(&isl29020_driver); +} + +static void __exit sensor_isl29020_exit(void) +{ + i2c_del_driver(&isl29020_driver); +} + +module_init(sensor_isl29020_init); +module_exit(sensor_isl29020_exit); + +MODULE_AUTHOR("Kalhan Trisal