+++ /dev/null
-/*
- * tsl2561.c - Linux kernel modules for light to digital convertor
- *
- * Copyright (C) 2008-2009 Jonathan Cameron <jic23@cam.ac.uk>
- *
- * 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; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * Some portions based upon the tsl2550 driver.
- *
- * This driver could probably be adapted easily to talk to the tsl2560 (smbus)
- *
- * Needs some work to support the events this can generate.
- * Todo: Implement interrupt handling. Currently a hardware bug means
- * this isn't available on my test board.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/i2c.h>
-#include "../iio.h"
-#include "../sysfs.h"
-#include "light.h"
-
-#define TSL2561_CONTROL_REGISTER 0x00
-#define TSL2561_TIMING_REGISTER 0x01
-#define TSL2561_THRESHLOW_LOW_REGISTER 0x02
-#define TSL2561_THRESHLOW_HIGH_REGISTER 0x03
-#define TSL2561_THRESHHIGH_LOW_REGISTER 0x04
-#define TSL2561_THRESHHIGH_HIGH_REGISTER 0x05
-#define TSL2561_INT_CONTROL_REGISTER 0x06
-
-#define TSL2561_INT_REG_INT_OFF 0x00
-#define TSL2561_INT_REG_INT_LEVEL 0x08
-#define TSL2561_INT_REG_INT_SMBUS 0x10
-#define TSL2561_INT_REG_INT_TEST 0x18
-
-#define TSL2561_ID_REGISTER 0x0A
-
-#define TSL2561_DATA_0_LOW 0x0C
-#define TSL2561_DATA_1_LOW 0x0E
-
-/* Control Register Values */
-#define TSL2561_CONT_REG_PWR_ON 0x03
-#define TSL2561_CONT_REG_PWR_OFF 0x00
-
-/**
- * struct tsl2561_state - device specific state
- * @indio_dev: the industrialio I/O info structure
- * @client: i2c client
- * @command_buf: single command buffer used for all operations
- * @command_buf_lock: ensure unique access to command_buf
- */
-struct tsl2561_state {
- struct iio_dev *indio_dev;
- struct i2c_client *client;
- struct tsl2561_command *command_buf;
- struct mutex command_buf_lock;
-};
-
-/**
- * struct tsl2561_command - command byte for smbus
- * @address: register address
- * @block: is this a block r/w
- * @word: is this a word r/w
- * @clear: set to 1 to clear pending interrupt
- * @cmd: select the command register - always 1.
- */
-struct tsl2561_command {
- unsigned int address:4;
- unsigned int block:1;
- unsigned int word:1;
- unsigned int clear:1;
- unsigned int cmd:1;
-};
-
-static inline void tsl2561_init_command_buf(struct tsl2561_command *buf)
-{
- buf->address = 0;
- buf->block = 0;
- buf->word = 0;
- buf->clear = 0;
- buf->cmd = 1;
-}
-
-static ssize_t tsl2561_read_val(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- int ret = 0, data;
- ssize_t len = 0;
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct tsl2561_state *st = indio_dev->dev_data;
-
- mutex_lock(&st->command_buf_lock);
- st->command_buf->cmd = 1;
- st->command_buf->word = 1;
- st->command_buf->address = this_attr->address;
-
- data = i2c_smbus_read_word_data(st->client, *(char *)(st->command_buf));
- if (data < 0) {
- ret = data;
- goto error_ret;
- }
- len = sprintf(buf, "%u\n", data);
-
-error_ret:
- mutex_unlock(&st->command_buf_lock);
-
- return ret ? ret : len;
-}
-
-static IIO_DEV_ATTR_LIGHT_INFRARED(0, tsl2561_read_val, TSL2561_DATA_0_LOW);
-static IIO_DEV_ATTR_LIGHT_BROAD(0, tsl2561_read_val, TSL2561_DATA_1_LOW);
-
-static struct attribute *tsl2561_attributes[] = {
- &iio_dev_attr_light_infrared0.dev_attr.attr,
- &iio_dev_attr_light_broadspectrum0.dev_attr.attr,
- NULL,
-};
-
-static const struct attribute_group tsl2561_attribute_group = {
- .attrs = tsl2561_attributes,
-};
-
-static int tsl2561_initialize(struct tsl2561_state *st)
-{
- int err;
-
- mutex_lock(&st->command_buf_lock);
- st->command_buf->word = 0;
- st->command_buf->block = 0;
- st->command_buf->address = TSL2561_CONTROL_REGISTER;
- err = i2c_smbus_write_byte_data(st->client, *(char *)(st->command_buf),
- TSL2561_CONT_REG_PWR_ON);
- if (err)
- goto error_ret;
-
- st->command_buf->address = TSL2561_INT_CONTROL_REGISTER;
- err = i2c_smbus_write_byte_data(st->client, *(char *)(st->command_buf),
- TSL2561_INT_REG_INT_TEST);
-
-error_ret:
- mutex_unlock(&st->command_buf_lock);
-
- return err;
-}
-
-static int tsl2561_powerdown(struct i2c_client *client)
-{
- int err;
- struct tsl2561_command Command = {
- .cmd = 1,
- .clear = 0,
- .word = 0,
- .block = 0,
- .address = TSL2561_CONTROL_REGISTER,
- };
-
- err = i2c_smbus_write_byte_data(client, *(char *)(&Command),
- TSL2561_CONT_REG_PWR_OFF);
- return (err < 0) ? err : 0;
-}
-static int __devinit tsl2561_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- int ret = 0, regdone = 0;
- struct tsl2561_state *st = kzalloc(sizeof(*st), GFP_KERNEL);
-
- if (st == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
- i2c_set_clientdata(client, st);
- st->client = client;
- mutex_init(&st->command_buf_lock);
-
- st->command_buf = kmalloc(sizeof(*st->command_buf), GFP_KERNEL);
- if (st->command_buf == NULL) {
- ret = -ENOMEM;
- goto error_free_state;
- }
- tsl2561_init_command_buf(st->command_buf);
-
- st->indio_dev = iio_allocate_device();
- if (st->indio_dev == NULL) {
- ret = -ENOMEM;
- goto error_free_command_buf;
- }
- st->indio_dev->attrs = &tsl2561_attribute_group;
- st->indio_dev->dev.parent = &client->dev;
- st->indio_dev->dev_data = (void *)(st);
- st->indio_dev->driver_module = THIS_MODULE;
- st->indio_dev->modes = INDIO_DIRECT_MODE;
- ret = iio_device_register(st->indio_dev);
- if (ret)
- goto error_free_iiodev;
- regdone = 1;
- /* Intialize the chip */
- ret = tsl2561_initialize(st);
- if (ret)
- goto error_unregister_iiodev;
-
- return 0;
-error_unregister_iiodev:
-error_free_iiodev:
- if (regdone)
- iio_device_unregister(st->indio_dev);
- else
- iio_free_device(st->indio_dev);
-error_free_command_buf:
- kfree(st->command_buf);
-error_free_state:
- kfree(st);
-error_ret:
- return ret;
-
-}
-
-static int __devexit tsl2561_remove(struct i2c_client *client)
-{
- struct tsl2561_state *st = i2c_get_clientdata(client);
-
- iio_device_unregister(st->indio_dev);
- kfree(st);
-
- return tsl2561_powerdown(client);
-}
-
-static const struct i2c_device_id tsl2561_id[] = {
- { "tsl2561", 0 },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, tsl2561_id);
-
-
-static struct i2c_driver tsl2561_driver = {
- .driver = {
- .name = "tsl2561",
- },
- .probe = tsl2561_probe,
- .remove = __devexit_p(tsl2561_remove),
- .id_table = tsl2561_id,
-};
-
-static __init int tsl2561_init(void)
-{
- return i2c_add_driver(&tsl2561_driver);
-}
-module_init(tsl2561_init);
-
-static __exit void tsl2561_exit(void)
-{
- i2c_del_driver(&tsl2561_driver);
-}
-module_exit(tsl2561_exit);
-
-MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>");
-MODULE_DESCRIPTION("TSL2561 light sensor driver");
-MODULE_LICENSE("GPL");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff