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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227// SPDX-License-Identifier: GPL-2.0-only/* * isl29020.c - Intersil ALS Driver * * Copyright (C) 2008 Intel Corp * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * Data sheet at: http://www.intersil.com/data/fn/fn6505.pdf */
#include <linux/module.h>#include <linux/slab.h>#include <linux/i2c.h>#include <linux/err.h>#include <linux/delay.h>#include <linux/sysfs.h>#include <linux/pm_runtime.h>
static DEFINE_MUTEX(mutex);
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);
if (val < 0) return val; return sprintf(buf, "%d000\n", 1 << (2 * (val & 3)));
}
static ssize_t als_lux_input_data_show(struct device *dev, struct device_attribute *attr, char *buf){ struct i2c_client *client = to_i2c_client(dev); int ret_val, val; unsigned long int lux; int temp;
pm_runtime_get_sync(dev); msleep(100);
mutex_lock(&mutex); temp = i2c_smbus_read_byte_data(client, 0x02); /* MSB data */ if (temp < 0) { pm_runtime_put_sync(dev); mutex_unlock(&mutex); return temp; }
ret_val = i2c_smbus_read_byte_data(client, 0x01); /* LSB data */ mutex_unlock(&mutex);
if (ret_val < 0) { pm_runtime_put_sync(dev); return ret_val; }
ret_val |= temp << 8; val = i2c_smbus_read_byte_data(client, 0x00); pm_runtime_put_sync(dev); if (val < 0) return val; lux = ((((1 << (2 * (val & 3))))*1000) * ret_val) / 65536; return sprintf(buf, "%lu\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); int ret_val; unsigned long val;
ret_val = kstrtoul(buf, 10, &val); if (ret_val) return ret_val;
if (val < 1 || val > 64000) return -EINVAL;
/* Pick the smallest sensor range that will meet our requirements */ if (val <= 1000) val = 1; else if (val <= 4000) val = 2; else if (val <= 16000) val = 3; else val = 4;
ret_val = i2c_smbus_read_byte_data(client, 0x00); if (ret_val < 0) return ret_val;
ret_val &= 0xFC; /*reset the bit before setting them */ ret_val |= val - 1; ret_val = i2c_smbus_write_byte_data(client, 0x00, ret_val);
if (ret_val < 0) return ret_val; return count;}
static void als_set_power_state(struct i2c_client *client, int enable){ int ret_val;
ret_val = i2c_smbus_read_byte_data(client, 0x00); if (ret_val < 0) return;
if (enable) ret_val |= 0x80; else ret_val &= 0x7F;
i2c_smbus_write_byte_data(client, 0x00, ret_val);}
static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR, als_sensing_range_show, als_sensing_range_store);static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux_input_data_show, NULL);
static struct attribute *mid_att_als[] = { &dev_attr_lux0_sensor_range.attr, &dev_attr_lux0_input.attr, NULL};
static const struct attribute_group m_als_gr = { .name = "isl29020", .attrs = mid_att_als};
static int als_set_default_config(struct i2c_client *client){ int retval;
retval = i2c_smbus_write_byte_data(client, 0x00, 0xc0); if (retval < 0) { dev_err(&client->dev, "default write failed."); return retval; } return 0;}
static int isl29020_probe(struct i2c_client *client){ int res;
res = als_set_default_config(client); if (res < 0) return res;
res = sysfs_create_group(&client->dev.kobj, &m_als_gr); if (res) { dev_err(&client->dev, "isl29020: device create file failed\n"); return res; } dev_info(&client->dev, "%s isl29020: ALS chip found\n", client->name); als_set_power_state(client, 0); pm_runtime_enable(&client->dev); return res;}
static void isl29020_remove(struct i2c_client *client){ pm_runtime_disable(&client->dev); sysfs_remove_group(&client->dev.kobj, &m_als_gr);}
static const struct i2c_device_id isl29020_id[] = { { .name = "isl29020" }, { }};
MODULE_DEVICE_TABLE(i2c, isl29020_id);
#ifdef CONFIG_PM
static int isl29020_runtime_suspend(struct device *dev){ struct i2c_client *client = to_i2c_client(dev); als_set_power_state(client, 0); return 0;}
static int isl29020_runtime_resume(struct device *dev){ struct i2c_client *client = to_i2c_client(dev); als_set_power_state(client, 1); return 0;}
static const struct dev_pm_ops isl29020_pm_ops = { .runtime_suspend = isl29020_runtime_suspend, .runtime_resume = isl29020_runtime_resume,};
#define ISL29020_PM_OPS (&isl29020_pm_ops)#else /* CONFIG_PM */#define ISL29020_PM_OPS NULL#endif /* CONFIG_PM */
static struct i2c_driver isl29020_driver = { .driver = { .name = "isl29020", .pm = ISL29020_PM_OPS, }, .probe = isl29020_probe, .remove = isl29020_remove, .id_table = isl29020_id,};
module_i2c_driver(isl29020_driver);
MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com>");MODULE_DESCRIPTION("Intersil isl29020 ALS Driver");MODULE_LICENSE("GPL v2");