cregit-Linux how code gets into the kernel

Release 4.7 drivers/misc/bh1780gli.c

Directory: drivers/misc
/*
 * bh1780gli.c
 * ROHM Ambient Light Sensor Driver
 *
 * Copyright (C) 2010 Texas Instruments
 * Author: Hemanth V <hemanthv@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 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.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/of.h>


#define BH1780_REG_CONTROL	0x80

#define BH1780_REG_PARTID	0x8A

#define BH1780_REG_MANFID	0x8B

#define BH1780_REG_DLOW	0x8C

#define BH1780_REG_DHIGH	0x8D


#define BH1780_REVMASK		(0xf)

#define BH1780_POWMASK		(0x3)

#define BH1780_POFF		(0x0)

#define BH1780_PON		(0x3)

/* power on settling time in ms */

#define BH1780_PON_DELAY	2


struct bh1780_data {
	
struct i2c_client *client;
	
int power_state;
	/* lock for sysfs operations */
	
struct mutex lock;
};


static int bh1780_write(struct bh1780_data *ddata, u8 reg, u8 val, char *msg) { int ret = i2c_smbus_write_byte_data(ddata->client, reg, val); if (ret < 0) dev_err(&ddata->client->dev, "i2c_smbus_write_byte_data failed error %d Register (%s)\n", ret, msg); return ret; }

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hemanth vhemanth v5998.33%150.00%
joe perchesjoe perches11.67%150.00%
Total60100.00%2100.00%


static int bh1780_read(struct bh1780_data *ddata, u8 reg, char *msg) { int ret = i2c_smbus_read_byte_data(ddata->client, reg); if (ret < 0) dev_err(&ddata->client->dev, "i2c_smbus_read_byte_data failed error %d Register (%s)\n", ret, msg); return ret; }

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hemanth vhemanth v5498.18%150.00%
joe perchesjoe perches11.82%150.00%
Total55100.00%2100.00%


static ssize_t bh1780_show_lux(struct device *dev, struct device_attribute *attr, char *buf) { struct platform_device *pdev = to_platform_device(dev); struct bh1780_data *ddata = platform_get_drvdata(pdev); int lsb, msb; lsb = bh1780_read(ddata, BH1780_REG_DLOW, "DLOW"); if (lsb < 0) return lsb; msb = bh1780_read(ddata, BH1780_REG_DHIGH, "DHIGH"); if (msb < 0) return msb; return sprintf(buf, "%d\n", (msb << 8) | lsb); }

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hemanth vhemanth v101100.00%1100.00%
Total101100.00%1100.00%


static ssize_t bh1780_show_power_state(struct device *dev, struct device_attribute *attr, char *buf) { struct platform_device *pdev = to_platform_device(dev); struct bh1780_data *ddata = platform_get_drvdata(pdev); int state; state = bh1780_read(ddata, BH1780_REG_CONTROL, "CONTROL"); if (state < 0) return state; return sprintf(buf, "%d\n", state & BH1780_POWMASK); }

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hemanth vhemanth v75100.00%1100.00%
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static ssize_t bh1780_store_power_state(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct platform_device *pdev = to_platform_device(dev); struct bh1780_data *ddata = platform_get_drvdata(pdev); unsigned long val; int error; error = kstrtoul(buf, 0, &val); if (error) return error; if (val < BH1780_POFF || val > BH1780_PON) return -EINVAL; mutex_lock(&ddata->lock); error = bh1780_write(ddata, BH1780_REG_CONTROL, val, "CONTROL"); if (error < 0) { mutex_unlock(&ddata->lock); return error; } msleep(BH1780_PON_DELAY); ddata->power_state = val; mutex_unlock(&ddata->lock); return count; }

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hemanth vhemanth v14599.32%150.00%
jingoo hanjingoo han10.68%150.00%
Total146100.00%2100.00%

static DEVICE_ATTR(lux, S_IRUGO, bh1780_show_lux, NULL); static DEVICE_ATTR(power_state, S_IWUSR | S_IRUGO, bh1780_show_power_state, bh1780_store_power_state); static struct attribute *bh1780_attributes[] = { &dev_attr_power_state.attr, &dev_attr_lux.attr, NULL }; static const struct attribute_group bh1780_attr_group = { .attrs = bh1780_attributes, };
static int bh1780_probe(struct i2c_client *client, const struct i2c_device_id *id) { int ret; struct bh1780_data *ddata; struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) return -EIO; ddata = devm_kzalloc(&client->dev, sizeof(struct bh1780_data), GFP_KERNEL); if (ddata == NULL) return -ENOMEM; ddata->client = client; i2c_set_clientdata(client, ddata); ret = bh1780_read(ddata, BH1780_REG_PARTID, "PART ID"); if (ret < 0) return ret; dev_info(&client->dev, "Ambient Light Sensor, Rev : %d\n", (ret & BH1780_REVMASK)); mutex_init(&ddata->lock); return sysfs_create_group(&client->dev.kobj, &bh1780_attr_group); }

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hemanth vhemanth v13890.79%150.00%
himangi saraogihimangi saraogi149.21%150.00%
Total152100.00%2100.00%


static int bh1780_remove(struct i2c_client *client) { sysfs_remove_group(&client->dev.kobj, &bh1780_attr_group); return 0; }

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hemanth vhemanth v27100.00%1100.00%
Total27100.00%1100.00%

#ifdef CONFIG_PM_SLEEP
static int bh1780_suspend(struct device *dev) { struct bh1780_data *ddata; int state, ret; struct i2c_client *client = to_i2c_client(dev); ddata = i2c_get_clientdata(client); state = bh1780_read(ddata, BH1780_REG_CONTROL, "CONTROL"); if (state < 0) return state; ddata->power_state = state & BH1780_POWMASK; ret = bh1780_write(ddata, BH1780_REG_CONTROL, BH1780_POFF, "CONTROL"); if (ret < 0) return ret; return 0; }

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hemanth vhemanth v7986.81%150.00%
shubhrajyoti dattashubhrajyoti datta1213.19%150.00%
Total91100.00%2100.00%


static int bh1780_resume(struct device *dev) { struct bh1780_data *ddata; int state, ret; struct i2c_client *client = to_i2c_client(dev); ddata = i2c_get_clientdata(client); state = ddata->power_state; ret = bh1780_write(ddata, BH1780_REG_CONTROL, state, "CONTROL"); if (ret < 0) return ret; return 0; }

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hemanth vhemanth v5782.61%150.00%
shubhrajyoti dattashubhrajyoti datta1217.39%150.00%
Total69100.00%2100.00%

#endif /* CONFIG_PM_SLEEP */ static SIMPLE_DEV_PM_OPS(bh1780_pm, bh1780_suspend, bh1780_resume); static const struct i2c_device_id bh1780_id[] = { { "bh1780", 0 }, { }, }; MODULE_DEVICE_TABLE(i2c, bh1780_id); #ifdef CONFIG_OF static const struct of_device_id of_bh1780_match[] = { { .compatible = "rohm,bh1780gli", }, {}, }; MODULE_DEVICE_TABLE(of, of_bh1780_match); #endif static struct i2c_driver bh1780_driver = { .probe = bh1780_probe, .remove = bh1780_remove, .id_table = bh1780_id, .driver = { .name = "bh1780", .pm = &bh1780_pm, .of_match_table = of_match_ptr(of_bh1780_match), }, }; module_i2c_driver(bh1780_driver); MODULE_DESCRIPTION("BH1780GLI Ambient Light Sensor Driver"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Hemanth V <hemanthv@ti.com>");

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hemanth vhemanth v93989.17%110.00%
linus walleijlinus walleij413.89%110.00%
shubhrajyoti dattashubhrajyoti datta383.61%110.00%
himangi saraogihimangi saraogi141.33%110.00%
jean delvarejean delvare70.66%110.00%
jingoo hanjingoo han70.66%220.00%
paul gortmakerpaul gortmaker30.28%110.00%
joe perchesjoe perches20.19%110.00%
axel linaxel lin20.19%110.00%
Total1053100.00%10100.00%
Directory: drivers/misc
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