Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Rodolfo Giometti | 1861 | 89.77% | 2 | 14.29% |
Jean Delvare | 109 | 5.26% | 4 | 28.57% |
Michele Jr De Candia | 36 | 1.74% | 2 | 14.29% |
Lars-Peter Clausen | 32 | 1.54% | 1 | 7.14% |
Javier Martinez Canillas | 30 | 1.45% | 1 | 7.14% |
Thomas Gleixner | 2 | 0.10% | 1 | 7.14% |
Matt Ranostay | 1 | 0.05% | 1 | 7.14% |
Axel Lin | 1 | 0.05% | 1 | 7.14% |
Wolfram Sang | 1 | 0.05% | 1 | 7.14% |
Total | 2073 | 14 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * 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> */ #include <linux/module.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 0; /* 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 > 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 > 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 tsl2550_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct i2c_adapter *adapter = client->adapter; 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 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_SLEEP static int tsl2550_suspend(struct device *dev) { return tsl2550_set_power_state(to_i2c_client(dev), 0); } static int tsl2550_resume(struct device *dev) { return tsl2550_set_power_state(to_i2c_client(dev), 1); } static SIMPLE_DEV_PM_OPS(tsl2550_pm_ops, tsl2550_suspend, tsl2550_resume); #define TSL2550_PM_OPS (&tsl2550_pm_ops) #else #define TSL2550_PM_OPS NULL #endif /* CONFIG_PM_SLEEP */ static const struct i2c_device_id tsl2550_id[] = { { "tsl2550", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, tsl2550_id); static const struct of_device_id tsl2550_of_match[] = { { .compatible = "taos,tsl2550" }, { } }; MODULE_DEVICE_TABLE(of, tsl2550_of_match); static struct i2c_driver tsl2550_driver = { .driver = { .name = TSL2550_DRV_NAME, .of_match_table = tsl2550_of_match, .pm = TSL2550_PM_OPS, }, .probe = tsl2550_probe, .remove = tsl2550_remove, .id_table = tsl2550_id, }; module_i2c_driver(tsl2550_driver); MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); MODULE_DESCRIPTION("TSL2550 ambient light sensor driver"); MODULE_LICENSE("GPL"); MODULE_VERSION(DRIVER_VERSION);
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