diff options
Diffstat (limited to 'drivers/i2c/chips/tsl2550.c')
| -rw-r--r-- | drivers/i2c/chips/tsl2550.c | 473 |
1 files changed, 0 insertions, 473 deletions
diff --git a/drivers/i2c/chips/tsl2550.c b/drivers/i2c/chips/tsl2550.c deleted file mode 100644 index a0702f36a72f..000000000000 --- a/drivers/i2c/chips/tsl2550.c +++ /dev/null @@ -1,473 +0,0 @@ -/* - * tsl2550.c - Linux kernel modules for ambient light sensor - * - * Copyright (C) 2007 Rodolfo Giometti <giometti@linux.it> - * Copyright (C) 2007 Eurotech S.p.A. <info@eurotech.it> - * - * 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. - */ - -#include <linux/module.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/i2c.h> -#include <linux/mutex.h> - -#define TSL2550_DRV_NAME "tsl2550" -#define DRIVER_VERSION "1.2" - -/* - * Defines - */ - -#define TSL2550_POWER_DOWN 0x00 -#define TSL2550_POWER_UP 0x03 -#define TSL2550_STANDARD_RANGE 0x18 -#define TSL2550_EXTENDED_RANGE 0x1d -#define TSL2550_READ_ADC0 0x43 -#define TSL2550_READ_ADC1 0x83 - -/* - * Structs - */ - -struct tsl2550_data { - struct i2c_client *client; - struct mutex update_lock; - - unsigned int power_state : 1; - unsigned int operating_mode : 1; -}; - -/* - * Global data - */ - -static const u8 TSL2550_MODE_RANGE[2] = { - TSL2550_STANDARD_RANGE, TSL2550_EXTENDED_RANGE, -}; - -/* - * Management functions - */ - -static int tsl2550_set_operating_mode(struct i2c_client *client, int mode) -{ - struct tsl2550_data *data = i2c_get_clientdata(client); - - int ret = i2c_smbus_write_byte(client, TSL2550_MODE_RANGE[mode]); - - data->operating_mode = mode; - - return ret; -} - -static int tsl2550_set_power_state(struct i2c_client *client, int state) -{ - struct tsl2550_data *data = i2c_get_clientdata(client); - int ret; - - if (state == 0) - ret = i2c_smbus_write_byte(client, TSL2550_POWER_DOWN); - else { - ret = i2c_smbus_write_byte(client, TSL2550_POWER_UP); - - /* On power up we should reset operating mode also... */ - tsl2550_set_operating_mode(client, data->operating_mode); - } - - data->power_state = state; - - return ret; -} - -static int tsl2550_get_adc_value(struct i2c_client *client, u8 cmd) -{ - int ret; - - ret = i2c_smbus_read_byte_data(client, cmd); - if (ret < 0) - return ret; - if (!(ret & 0x80)) - return -EAGAIN; - return ret & 0x7f; /* remove the "valid" bit */ -} - -/* - * LUX calculation - */ - -#define TSL2550_MAX_LUX 1846 - -static const u8 ratio_lut[] = { - 100, 100, 100, 100, 100, 100, 100, 100, - 100, 100, 100, 100, 100, 100, 99, 99, - 99, 99, 99, 99, 99, 99, 99, 99, - 99, 99, 99, 98, 98, 98, 98, 98, - 98, 98, 97, 97, 97, 97, 97, 96, - 96, 96, 96, 95, 95, 95, 94, 94, - 93, 93, 93, 92, 92, 91, 91, 90, - 89, 89, 88, 87, 87, 86, 85, 84, - 83, 82, 81, 80, 79, 78, 77, 75, - 74, 73, 71, 69, 68, 66, 64, 62, - 60, 58, 56, 54, 52, 49, 47, 44, - 42, 41, 40, 40, 39, 39, 38, 38, - 37, 37, 37, 36, 36, 36, 35, 35, - 35, 35, 34, 34, 34, 34, 33, 33, - 33, 33, 32, 32, 32, 32, 32, 31, - 31, 31, 31, 31, 30, 30, 30, 30, - 30, -}; - -static const u16 count_lut[] = { - 0, 1, 2, 3, 4, 5, 6, 7, - 8, 9, 10, 11, 12, 13, 14, 15, - 16, 18, 20, 22, 24, 26, 28, 30, - 32, 34, 36, 38, 40, 42, 44, 46, - 49, 53, 57, 61, 65, 69, 73, 77, - 81, 85, 89, 93, 97, 101, 105, 109, - 115, 123, 131, 139, 147, 155, 163, 171, - 179, 187, 195, 203, 211, 219, 227, 235, - 247, 263, 279, 295, 311, 327, 343, 359, - 375, 391, 407, 423, 439, 455, 471, 487, - 511, 543, 575, 607, 639, 671, 703, 735, - 767, 799, 831, 863, 895, 927, 959, 991, - 1039, 1103, 1167, 1231, 1295, 1359, 1423, 1487, - 1551, 1615, 1679, 1743, 1807, 1871, 1935, 1999, - 2095, 2223, 2351, 2479, 2607, 2735, 2863, 2991, - 3119, 3247, 3375, 3503, 3631, 3759, 3887, 4015, -}; - -/* - * This function is described into Taos TSL2550 Designer's Notebook - * pages 2, 3. - */ -static int tsl2550_calculate_lux(u8 ch0, u8 ch1) -{ - unsigned int lux; - - /* Look up count from channel values */ - u16 c0 = count_lut[ch0]; - u16 c1 = count_lut[ch1]; - - /* - * Calculate ratio. - * Note: the "128" is a scaling factor - */ - u8 r = 128; - - /* Avoid division by 0 and count 1 cannot be greater than count 0 */ - if (c1 <= c0) - if (c0) { - r = c1 * 128 / c0; - - /* Calculate LUX */ - lux = ((c0 - c1) * ratio_lut[r]) / 256; - } else - lux = 0; - else - return -EAGAIN; - - /* LUX range check */ - return lux > TSL2550_MAX_LUX ? TSL2550_MAX_LUX : lux; -} - -/* - * SysFS support - */ - -static ssize_t tsl2550_show_power_state(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct tsl2550_data *data = i2c_get_clientdata(to_i2c_client(dev)); - - return sprintf(buf, "%u\n", data->power_state); -} - -static ssize_t tsl2550_store_power_state(struct device *dev, - struct device_attribute *attr, const char *buf, size_t count) -{ - struct i2c_client *client = to_i2c_client(dev); - struct tsl2550_data *data = i2c_get_clientdata(client); - unsigned long val = simple_strtoul(buf, NULL, 10); - int ret; - - if (val < 0 || val > 1) - return -EINVAL; - - mutex_lock(&data->update_lock); - ret = tsl2550_set_power_state(client, val); - mutex_unlock(&data->update_lock); - - if (ret < 0) - return ret; - - return count; -} - -static DEVICE_ATTR(power_state, S_IWUSR | S_IRUGO, - tsl2550_show_power_state, tsl2550_store_power_state); - -static ssize_t tsl2550_show_operating_mode(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct tsl2550_data *data = i2c_get_clientdata(to_i2c_client(dev)); - - return sprintf(buf, "%u\n", data->operating_mode); -} - -static ssize_t tsl2550_store_operating_mode(struct device *dev, - struct device_attribute *attr, const char *buf, size_t count) -{ - struct i2c_client *client = to_i2c_client(dev); - struct tsl2550_data *data = i2c_get_clientdata(client); - unsigned long val = simple_strtoul(buf, NULL, 10); - int ret; - - if (val < 0 || val > 1) - return -EINVAL; - - if (data->power_state == 0) - return -EBUSY; - - mutex_lock(&data->update_lock); - ret = tsl2550_set_operating_mode(client, val); - mutex_unlock(&data->update_lock); - - if (ret < 0) - return ret; - - return count; -} - -static DEVICE_ATTR(operating_mode, S_IWUSR | S_IRUGO, - tsl2550_show_operating_mode, tsl2550_store_operating_mode); - -static ssize_t __tsl2550_show_lux(struct i2c_client *client, char *buf) -{ - struct tsl2550_data *data = i2c_get_clientdata(client); - u8 ch0, ch1; - int ret; - - ret = tsl2550_get_adc_value(client, TSL2550_READ_ADC0); - if (ret < 0) - return ret; - ch0 = ret; - - ret = tsl2550_get_adc_value(client, TSL2550_READ_ADC1); - if (ret < 0) - return ret; - ch1 = ret; - - /* Do the job */ - ret = tsl2550_calculate_lux(ch0, ch1); - if (ret < 0) - return ret; - if (data->operating_mode == 1) - ret *= 5; - - return sprintf(buf, "%d\n", ret); -} - -static ssize_t tsl2550_show_lux1_input(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct i2c_client *client = to_i2c_client(dev); - struct tsl2550_data *data = i2c_get_clientdata(client); - int ret; - - /* No LUX data if not operational */ - if (!data->power_state) - return -EBUSY; - - mutex_lock(&data->update_lock); - ret = __tsl2550_show_lux(client, buf); - mutex_unlock(&data->update_lock); - - return ret; -} - -static DEVICE_ATTR(lux1_input, S_IRUGO, - tsl2550_show_lux1_input, NULL); - -static struct attribute *tsl2550_attributes[] = { - &dev_attr_power_state.attr, - &dev_attr_operating_mode.attr, - &dev_attr_lux1_input.attr, - NULL -}; - -static const struct attribute_group tsl2550_attr_group = { - .attrs = tsl2550_attributes, -}; - -/* - * Initialization function - */ - -static int tsl2550_init_client(struct i2c_client *client) -{ - struct tsl2550_data *data = i2c_get_clientdata(client); - int err; - - /* - * Probe the chip. To do so we try to power up the device and then to - * read back the 0x03 code - */ - err = i2c_smbus_read_byte_data(client, TSL2550_POWER_UP); - if (err < 0) - return err; - if (err != TSL2550_POWER_UP) - return -ENODEV; - data->power_state = 1; - - /* Set the default operating mode */ - err = i2c_smbus_write_byte(client, - TSL2550_MODE_RANGE[data->operating_mode]); - if (err < 0) - return err; - - return 0; -} - -/* - * I2C init/probing/exit functions - */ - -static struct i2c_driver tsl2550_driver; -static int __devinit tsl2550_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); - struct tsl2550_data *data; - int *opmode, err = 0; - - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE - | I2C_FUNC_SMBUS_READ_BYTE_DATA)) { - err = -EIO; - goto exit; - } - - data = kzalloc(sizeof(struct tsl2550_data), GFP_KERNEL); - if (!data) { - err = -ENOMEM; - goto exit; - } - data->client = client; - i2c_set_clientdata(client, data); - - /* Check platform data */ - opmode = client->dev.platform_data; - if (opmode) { - if (*opmode < 0 || *opmode > 1) { - dev_err(&client->dev, "invalid operating_mode (%d)\n", - *opmode); - err = -EINVAL; - goto exit_kfree; - } - data->operating_mode = *opmode; - } else - data->operating_mode = 0; /* default mode is standard */ - dev_info(&client->dev, "%s operating mode\n", - data->operating_mode ? "extended" : "standard"); - - mutex_init(&data->update_lock); - - /* Initialize the TSL2550 chip */ - err = tsl2550_init_client(client); - if (err) - goto exit_kfree; - - /* Register sysfs hooks */ - err = sysfs_create_group(&client->dev.kobj, &tsl2550_attr_group); - if (err) - goto exit_kfree; - - dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION); - - return 0; - -exit_kfree: - kfree(data); -exit: - return err; -} - -static int __devexit tsl2550_remove(struct i2c_client *client) -{ - sysfs_remove_group(&client->dev.kobj, &tsl2550_attr_group); - - /* Power down the device */ - tsl2550_set_power_state(client, 0); - - kfree(i2c_get_clientdata(client)); - - return 0; -} - -#ifdef CONFIG_PM - -static int tsl2550_suspend(struct i2c_client *client, pm_message_t mesg) -{ - return tsl2550_set_power_state(client, 0); -} - -static int tsl2550_resume(struct i2c_client *client) -{ - return tsl2550_set_power_state(client, 1); -} - -#else - -#define tsl2550_suspend NULL -#define tsl2550_resume NULL - -#endif /* CONFIG_PM */ - -static const struct i2c_device_id tsl2550_id[] = { - { "tsl2550", 0 }, - { } -}; -MODULE_DEVICE_TABLE(i2c, tsl2550_id); - -static struct i2c_driver tsl2550_driver = { - .driver = { - .name = TSL2550_DRV_NAME, - .owner = THIS_MODULE, - }, - .suspend = tsl2550_suspend, - .resume = tsl2550_resume, - .probe = tsl2550_probe, - .remove = __devexit_p(tsl2550_remove), - .id_table = tsl2550_id, -}; - -static int __init tsl2550_init(void) -{ - return i2c_add_driver(&tsl2550_driver); -} - -static void __exit tsl2550_exit(void) -{ - i2c_del_driver(&tsl2550_driver); -} - -MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); -MODULE_DESCRIPTION("TSL2550 ambient light sensor driver"); -MODULE_LICENSE("GPL"); -MODULE_VERSION(DRIVER_VERSION); - -module_init(tsl2550_init); -module_exit(tsl2550_exit); |