2  *  tsl2550.c - Linux kernel modules for ambient light sensor
9  *  the Free Software Foundation; either version 2 of the License, or
57 static const u8 TSL2550_MODE_RANGE[2] = {
71 	data->operating_mode = mode;  in tsl2550_set_operating_mode()
87 		tsl2550_set_operating_mode(client, data->operating_mode);  in tsl2550_set_power_state()
90 	data->power_state = state;  in tsl2550_set_power_state()
103 		return -EAGAIN;  in tsl2550_get_adc_value()
134 	0, 1, 2, 3, 4, 5, 6, 7,
154  * pages 2, 3.
156 static int tsl2550_calculate_lux(u8 ch0, u8 ch1)  in tsl2550_calculate_lux()  argument
161 	u16 c0 = count_lut[ch0];  in tsl2550_calculate_lux()
176 			lux = ((c0 - c1) * ratio_lut[r]) / 256;  in tsl2550_calculate_lux()
195 	return sprintf(buf, "%u\n", data->power_state);  in tsl2550_show_power_state()
207 		return -EINVAL;  in tsl2550_store_power_state()
209 	mutex_lock(&data->update_lock);  in tsl2550_store_power_state()
211 	mutex_unlock(&data->update_lock);  in tsl2550_store_power_state()
227 	return sprintf(buf, "%u\n", data->operating_mode);  in tsl2550_show_operating_mode()
239 		return -EINVAL;  in tsl2550_store_operating_mode()
241 	if (data->power_state == 0)  in tsl2550_store_operating_mode()
242 		return -EBUSY;  in tsl2550_store_operating_mode()
244 	mutex_lock(&data->update_lock);  in tsl2550_store_operating_mode()
246 	mutex_unlock(&data->update_lock);  in tsl2550_store_operating_mode()
260 	u8 ch0, ch1;  in __tsl2550_show_lux()  local
266 	ch0 = ret;  in __tsl2550_show_lux()
274 	ret = tsl2550_calculate_lux(ch0, ch1);  in __tsl2550_show_lux()
277 	if (data->operating_mode == 1)  in __tsl2550_show_lux()
291 	if (!data->power_state)  in tsl2550_show_lux1_input()
292 		return -EBUSY;  in tsl2550_show_lux1_input()
294 	mutex_lock(&data->update_lock);  in tsl2550_show_lux1_input()
296 	mutex_unlock(&data->update_lock);  in tsl2550_show_lux1_input()
332 		return -ENODEV;  in tsl2550_init_client()
333 	data->power_state = 1;  in tsl2550_init_client()
337 				   TSL2550_MODE_RANGE[data->operating_mode]);  in tsl2550_init_client()
352 	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);  in tsl2550_probe()
358 		err = -EIO;  in tsl2550_probe()
364 		err = -ENOMEM;  in tsl2550_probe()
367 	data->client = client;  in tsl2550_probe()
371 	opmode = client->dev.platform_data;  in tsl2550_probe()
374 			dev_err(&client->dev, "invalid operating_mode (%d)\n",  in tsl2550_probe()
376 			err = -EINVAL;  in tsl2550_probe()
379 		data->operating_mode = *opmode;  in tsl2550_probe()
381 		data->operating_mode = 0;	/* default mode is standard */  in tsl2550_probe()
382 	dev_info(&client->dev, "%s operating mode\n",  in tsl2550_probe()
383 			data->operating_mode ? "extended" : "standard");  in tsl2550_probe()
385 	mutex_init(&data->update_lock);  in tsl2550_probe()
393 	err = sysfs_create_group(&client->dev.kobj, &tsl2550_attr_group);  in tsl2550_probe()
397 	dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION);  in tsl2550_probe()
409 	sysfs_remove_group(&client->dev.kobj, &tsl2550_attr_group);  in tsl2550_remove()