drivers/misc: ROHM BH1780GLI ambient light sensor driver (7efe15f2) · Commits · 戴 / test

drivers/misc/Kconfig

+10 −0

Original line number	Diff line number	Diff line
		@@ -304,6 +304,16 @@ config SENSORS_TSL2550
		This driver can also be built as a module. If so, the module
		will be called tsl2550.

		config SENSORS_BH1780
		tristate "ROHM BH1780GLI ambient light sensor"
		depends on I2C && SYSFS
		help
		If you say yes here you get support for the ROHM BH1780GLI
		ambient light sensor.

		This driver can also be built as a module. If so, the module
		will be called bh1780gli.

		config EP93XX_PWM
		tristate "EP93xx PWM support"
		depends on ARCH_EP93XX

drivers/misc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -14,6 +14,7 @@ obj-$(CONFIG_LKDTM) += lkdtm.o
		obj-$(CONFIG_TIFM_CORE) += tifm_core.o
		obj-$(CONFIG_TIFM_7XX1) += tifm_7xx1.o
		obj-$(CONFIG_PHANTOM) += phantom.o
		obj-$(CONFIG_SENSORS_BH1780) += bh1780gli.o
		obj-$(CONFIG_SGI_IOC4) += ioc4.o
		obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o
		obj-$(CONFIG_KGDB_TESTS) += kgdbts.o

drivers/misc/bh1780gli.c

0 → 100644

+273 −0

Original line number	Diff line number	Diff line
		/*
		* 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>

		#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;
		}

		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;
		}

		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);
		}

		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);
		}

		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 = strict_strtoul(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;
		}

		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 __devinit bh1780_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		int ret;
		struct bh1780_data *ddata = NULL;
		struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);

		if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) {
		ret = -EIO;
		goto err_op_failed;
		}

		ddata = kzalloc(sizeof(struct bh1780_data), GFP_KERNEL);
		if (ddata == NULL) {
		ret = -ENOMEM;
		goto err_op_failed;
		}

		ddata->client = client;
		i2c_set_clientdata(client, ddata);

		ret = bh1780_read(ddata, BH1780_REG_PARTID, "PART ID");
		if (ret < 0)
		goto err_op_failed;

		dev_info(&client->dev, "Ambient Light Sensor, Rev : %d\n",
		(ret & BH1780_REVMASK));

		mutex_init(&ddata->lock);

		ret = sysfs_create_group(&client->dev.kobj, &bh1780_attr_group);
		if (ret)
		goto err_op_failed;

		return 0;

		err_op_failed:
		kfree(ddata);
		return ret;
		}

		static int __devexit bh1780_remove(struct i2c_client *client)
		{
		struct bh1780_data *ddata;

		ddata = i2c_get_clientdata(client);
		sysfs_remove_group(&client->dev.kobj, &bh1780_attr_group);
		i2c_set_clientdata(client, NULL);
		kfree(ddata);

		return 0;
		}

		#ifdef CONFIG_PM
		static int bh1780_suspend(struct i2c_client *client, pm_message_t mesg)
		{
		struct bh1780_data *ddata;
		int state, ret;

		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;
		}

		static int bh1780_resume(struct i2c_client *client)
		{
		struct bh1780_data *ddata;
		int state, ret;

		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;
		}
		#else
		#define bh1780_suspend NULL
		#define bh1780_resume NULL
		#endif /* CONFIG_PM */

		static const struct i2c_device_id bh1780_id[] = {
		{ "bh1780", 0 },
		{ },
		};

		static struct i2c_driver bh1780_driver = {
		.probe = bh1780_probe,
		.remove = bh1780_remove,
		.id_table = bh1780_id,
		.suspend = bh1780_suspend,
		.resume = bh1780_resume,
		.driver = {
		.name = "bh1780"
		},
		};

		static int __init bh1780_init(void)
		{
		return i2c_add_driver(&bh1780_driver);
		}

		static void __exit bh1780_exit(void)
		{
		i2c_del_driver(&bh1780_driver);
		}

		module_init(bh1780_init)
		module_exit(bh1780_exit)

		MODULE_DESCRIPTION("BH1780GLI Ambient Light Sensor Driver");
		MODULE_LICENSE("GPL");
		MODULE_AUTHOR("Hemanth V <hemanthv@ti.com>");

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