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Date: Thu, 15 Apr 2010 00:45:42 +0200
From: Daniel Mack <daniel@...aq.de>
To: Alan Cox <alan@...ux.intel.com>
Cc: linux-i2c@...r.kernel.org, khali@...ux-fr.org,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
Jonathan Cameron <jic23@....ac.uk>
Subject: Re: [PATCH 2/4] isl29020: ambient light sensor
On Wed, Apr 14, 2010 at 01:51:49PM +0100, Alan Cox wrote:
> 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 <kalhan.trisal@...el.com>
> Signed-off-by: Alan Cox <alan@...ux.intel.com>
> ---
>
> 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
Would it be possible to make the existing driver for the ISL29003
support the ISL29020 as well?
Also note that there is a ALS (ambient light sensor) framework pending.
So patches against the 29003 driver should apply to this tree:
git://git.kernel.org/pub/scm/linux/kernel/git/jic23/als.git
I copied the maintainer to this mail. Jonathan, any plans when ALS will
be merged?
Thanks,
Daniel
> 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 <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/slab.h>
> +#include <linux/i2c.h>
> +#include <linux/hwmon.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/hwmon-vid.h>
> +#include <linux/err.h>
> +#include <linux/delay.h>
> +#include <linux/mutex.h>
> +#include <linux/sysfs.h>
> +
> +
> +#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 <kalhan.trisal@...el.com");
> +MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");
> +MODULE_LICENSE("GPL v2");
>
> --
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