1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  tsl2550.c - Linux kernel modules for ambient light sensor
44 static const u8 TSL2550_MODE_RANGE[2] = {
58 	data->operating_mode = mode;  in tsl2550_set_operating_mode()
74 		tsl2550_set_operating_mode(client, data->operating_mode);  in tsl2550_set_power_state()
77 	data->power_state = state;  in tsl2550_set_power_state()
90 		return -EAGAIN;  in tsl2550_get_adc_value()
121 	0, 1, 2, 3, 4, 5, 6, 7,
141  * pages 2, 3.
143 static int tsl2550_calculate_lux(u8 ch0, u8 ch1)  in tsl2550_calculate_lux()  argument
148 	u16 c0 = count_lut[ch0];  in tsl2550_calculate_lux()
161 			lux = ((c0 - c1) * ratio_lut[r]) / 256;  in tsl2550_calculate_lux()
180 	return sprintf(buf, "%u\n", data->power_state);  in tsl2550_show_power_state()
192 		return -EINVAL;  in tsl2550_store_power_state()
194 	mutex_lock(&data->update_lock);  in tsl2550_store_power_state()
196 	mutex_unlock(&data->update_lock);  in tsl2550_store_power_state()
212 	return sprintf(buf, "%u\n", data->operating_mode);  in tsl2550_show_operating_mode()
224 		return -EINVAL;  in tsl2550_store_operating_mode()
226 	if (data->power_state == 0)  in tsl2550_store_operating_mode()
227 		return -EBUSY;  in tsl2550_store_operating_mode()
229 	mutex_lock(&data->update_lock);  in tsl2550_store_operating_mode()
231 	mutex_unlock(&data->update_lock);  in tsl2550_store_operating_mode()
245 	u8 ch0, ch1;  in __tsl2550_show_lux()  local
251 	ch0 = ret;  in __tsl2550_show_lux()
259 	ret = tsl2550_calculate_lux(ch0, ch1);  in __tsl2550_show_lux()
262 	if (data->operating_mode == 1)  in __tsl2550_show_lux()
276 	if (!data->power_state)  in tsl2550_show_lux1_input()
277 		return -EBUSY;  in tsl2550_show_lux1_input()
279 	mutex_lock(&data->update_lock);  in tsl2550_show_lux1_input()
281 	mutex_unlock(&data->update_lock);  in tsl2550_show_lux1_input()
317 		return -ENODEV;  in tsl2550_init_client()
318 	data->power_state = 1;  in tsl2550_init_client()
322 				   TSL2550_MODE_RANGE[data->operating_mode]);  in tsl2550_init_client()
336 	struct i2c_adapter *adapter = client->adapter;  in tsl2550_probe()
342 		err = -EIO;  in tsl2550_probe()
348 		err = -ENOMEM;  in tsl2550_probe()
351 	data->client = client;  in tsl2550_probe()
355 	opmode = client->dev.platform_data;  in tsl2550_probe()
358 			dev_err(&client->dev, "invalid operating_mode (%d)\n",  in tsl2550_probe()
360 			err = -EINVAL;  in tsl2550_probe()
363 		data->operating_mode = *opmode;  in tsl2550_probe()
365 		data->operating_mode = 0;	/* default mode is standard */  in tsl2550_probe()
366 	dev_info(&client->dev, "%s operating mode\n",  in tsl2550_probe()
367 			data->operating_mode ? "extended" : "standard");  in tsl2550_probe()
369 	mutex_init(&data->update_lock);  in tsl2550_probe()
377 	err = sysfs_create_group(&client->dev.kobj, &tsl2550_attr_group);  in tsl2550_probe()
381 	dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION);  in tsl2550_probe()
393 	sysfs_remove_group(&client->dev.kobj, &tsl2550_attr_group);  in tsl2550_remove()