1 // SPDX-License-Identifier: GPL-2.0-only
3  * mpl115.c - Support for Freescale MPL115A pressure/temperature sensor
12 #include <linux/delay.h>
37 	int ret = data->ops->write(data->dev, MPL115_CONVERT, 0);  in mpl115_request()
54 	mutex_lock(&data->lock);  in mpl115_comp_pressure()
59 	ret = data->ops->read(data->dev, MPL115_PADC);  in mpl115_comp_pressure()
64 	ret = data->ops->read(data->dev, MPL115_TADC);  in mpl115_comp_pressure()
70 	a1 = data->b1 + ((data->c12 * tadc) >> 11);  in mpl115_comp_pressure()
71 	y1 = (data->a0 << 10) + a1 * padc;  in mpl115_comp_pressure()
74 	pcomp = (y1 + ((data->b2 * (int) tadc) >> 1)) >> 9;  in mpl115_comp_pressure()
76 	kpa = pcomp * (115 - 50) / 1023 + (50 << 4);  in mpl115_comp_pressure()
80 	mutex_unlock(&data->lock);  in mpl115_comp_pressure()
88 	mutex_lock(&data->lock);  in mpl115_read_temp()
92 	ret = data->ops->read(data->dev, MPL115_TADC);  in mpl115_read_temp()
94 	mutex_unlock(&data->lock);  in mpl115_read_temp()
107 		pm_runtime_get_sync(data->dev);  in mpl115_read_raw()
111 		pm_runtime_mark_last_busy(data->dev);  in mpl115_read_raw()
112 		pm_runtime_put_autosuspend(data->dev);  in mpl115_read_raw()
116 		pm_runtime_get_sync(data->dev);  in mpl115_read_raw()
117 		/* temperature -5.35 C / LSB, 472 LSB is 25 C */  in mpl115_read_raw()
121 		pm_runtime_mark_last_busy(data->dev);  in mpl115_read_raw()
122 		pm_runtime_put_autosuspend(data->dev);  in mpl115_read_raw()
127 		*val = -605;  in mpl115_read_raw()
131 		*val = -186;  in mpl115_read_raw()
135 	return -EINVAL;  in mpl115_read_raw()
164 		return -ENOMEM;  in mpl115_probe()
167 	data->dev = dev;  in mpl115_probe()
168 	data->ops = ops;  in mpl115_probe()
169 	mutex_init(&data->lock);  in mpl115_probe()
171 	indio_dev->info = &mpl115_info;  in mpl115_probe()
172 	indio_dev->name = name;  in mpl115_probe()
173 	indio_dev->modes = INDIO_DIRECT_MODE;  in mpl115_probe()
174 	indio_dev->channels = mpl115_channels;  in mpl115_probe()
175 	indio_dev->num_channels = ARRAY_SIZE(mpl115_channels);  in mpl115_probe()
177 	ret = data->ops->init(data->dev);  in mpl115_probe()
183 	ret = data->ops->read(data->dev, MPL115_A0);  in mpl115_probe()
186 	data->a0 = ret;  in mpl115_probe()
187 	ret = data->ops->read(data->dev, MPL115_B1);  in mpl115_probe()
190 	data->b1 = ret;  in mpl115_probe()
191 	ret = data->ops->read(data->dev, MPL115_B2);  in mpl115_probe()
194 	data->b2 = ret;  in mpl115_probe()
195 	ret = data->ops->read(data->dev, MPL115_C12);  in mpl115_probe()
198 	data->c12 = ret;  in mpl115_probe()
200 	data->shutdown = devm_gpiod_get_optional(dev, "shutdown",  in mpl115_probe()
202 	if (IS_ERR(data->shutdown))  in mpl115_probe()
203 		return dev_err_probe(dev, PTR_ERR(data->shutdown),  in mpl115_probe()
206 	if (data->shutdown) {  in mpl115_probe()
214 		 * reading after power-on and 5 ms to actually power-on,  in mpl115_probe()
215 		 * do not shut it down unnecessarily. Set autosuspend to  in mpl115_probe()
222 		dev_dbg(dev, "low-power mode enabled");  in mpl115_probe()
224 		dev_dbg(dev, "low-power mode disabled");  in mpl115_probe()
234 	gpiod_set_value(data->shutdown, 1);  in mpl115_runtime_suspend()
243 	gpiod_set_value(data->shutdown, 0);  in mpl115_runtime_resume()