1 // SPDX-License-Identifier: GPL-2.0-only
3  * Windfarm PowerMac thermal control. AD7417 sensors
38 	struct wf_ad7417_priv *pv = sr->priv;  in wf_ad7417_temp_get()
44 	mutex_lock(&pv->lock);  in wf_ad7417_temp_get()
48 	rc = i2c_master_send(pv->i2c, buf, 1);  in wf_ad7417_temp_get()
51 	rc = i2c_master_recv(pv->i2c, buf, 2);  in wf_ad7417_temp_get()
55 	/* Read a a 16-bit signed value */  in wf_ad7417_temp_get()
58 	/* Convert 8.8-bit to 16.16 fixed point */  in wf_ad7417_temp_get()
61 	mutex_unlock(&pv->lock);  in wf_ad7417_temp_get()
65 	mutex_unlock(&pv->lock);  in wf_ad7417_temp_get()
66 	return -1;  in wf_ad7417_temp_get()
71  * for the CPU diode which is obtained from the EEPROM).
83 	case 1: /* Diode */  in wf_ad7417_adc_convert()
84 		*value = (raw * (s32)pv->mpu->mdiode +  in wf_ad7417_adc_convert()
85 			((s32)pv->mpu->bdiode << 12)) >> 2;  in wf_ad7417_adc_convert()
101 	struct wf_ad7417_priv *pv = sr->priv;  in wf_ad7417_adc_get()
102 	int chan = sr - pv->sensors;  in wf_ad7417_adc_get()
108 	mutex_lock(&pv->lock);  in wf_ad7417_adc_get()
112 		buf[1] = (pv->config & 0x1f) | (chan << 5);  in wf_ad7417_adc_get()
113 		rc = i2c_master_send(pv->i2c, buf, 2);  in wf_ad7417_adc_get()
122 		rc = i2c_master_send(pv->i2c, buf, 1);  in wf_ad7417_adc_get()
127 		rc = i2c_master_recv(pv->i2c, buf, 2);  in wf_ad7417_adc_get()
131 		/* Read a a 16-bit signed value */  in wf_ad7417_adc_get()
135 		dev_vdbg(&pv->i2c->dev, "ADC chan %d [%s]"  in wf_ad7417_adc_get()
137 			 chan, sr->name, raw, *value);  in wf_ad7417_adc_get()
139 		mutex_unlock(&pv->lock);  in wf_ad7417_adc_get()
143 		dev_dbg(&pv->i2c->dev,  in wf_ad7417_adc_get()
148 	mutex_unlock(&pv->lock);  in wf_ad7417_adc_get()
149 	return -1;  in wf_ad7417_adc_get()
161 	struct wf_ad7417_priv *pv = sr->priv;  in wf_ad7417_sensor_release()
163 	kfree(sr->name);  in wf_ad7417_sensor_release()
164 	kref_put(&pv->ref, wf_ad7417_release);  in wf_ad7417_sensor_release()
183 	pv->sensors[index].name = kasprintf(GFP_KERNEL, "%s-%d", name, pv->cpu);  in wf_ad7417_add_sensor()
184 	pv->sensors[index].priv = pv;  in wf_ad7417_add_sensor()
185 	pv->sensors[index].ops = ops;  in wf_ad7417_add_sensor()
186 	if (!wf_register_sensor(&pv->sensors[index]))  in wf_ad7417_add_sensor()
187 		kref_get(&pv->ref);  in wf_ad7417_add_sensor()
206 	i2c_master_send(pv->i2c, buf, 2);  in wf_ad7417_init_chip()
210 	rc = i2c_master_send(pv->i2c, buf, 1);  in wf_ad7417_init_chip()
212 		rc = i2c_master_recv(pv->i2c, buf, 1);  in wf_ad7417_init_chip()
216 			dev_dbg(&pv->i2c->dev, "ADC config reg: %02x\n",  in wf_ad7417_init_chip()
223 			rc = i2c_master_send(pv->i2c, buf, 2);  in wf_ad7417_init_chip()
227 		dev_err(&pv->i2c->dev, "Error reading ADC config\n");  in wf_ad7417_init_chip()
229 	pv->config = config;  in wf_ad7417_init_chip()
239 	loc = of_get_property(client->dev.of_node, "hwsensor-location", NULL);  in wf_ad7417_probe()
241 		dev_warn(&client->dev, "Missing hwsensor-location property!\n");  in wf_ad7417_probe()
242 		return -ENXIO;  in wf_ad7417_probe()
247 	 * in the hwsensor-location list  in wf_ad7417_probe()
255 		return -ENXIO;  in wf_ad7417_probe()
259 		dev_err(&client->dev, "Failed to retrieve MPU data\n");  in wf_ad7417_probe()
260 		return -ENXIO;  in wf_ad7417_probe()
265 		return -ENODEV;  in wf_ad7417_probe()
267 	kref_init(&pv->ref);  in wf_ad7417_probe()
268 	mutex_init(&pv->lock);  in wf_ad7417_probe()
269 	pv->i2c = client;  in wf_ad7417_probe()
270 	pv->cpu = cpu_nr;  in wf_ad7417_probe()
271 	pv->mpu = mpu;  in wf_ad7417_probe()
272 	dev_set_drvdata(&client->dev, pv);  in wf_ad7417_probe()
278 	 * We cannot rely on Apple device-tree giving us child  in wf_ad7417_probe()
282 	wf_ad7417_add_sensor(pv, 0, "cpu-amb-temp", &wf_ad7417_temp_ops);  in wf_ad7417_probe()
283 	wf_ad7417_add_sensor(pv, 1, "cpu-diode-temp", &wf_ad7417_adc_ops);  in wf_ad7417_probe()
284 	wf_ad7417_add_sensor(pv, 2, "cpu-12v-current", &wf_ad7417_adc_ops);  in wf_ad7417_probe()
285 	wf_ad7417_add_sensor(pv, 3, "cpu-voltage", &wf_ad7417_adc_ops);  in wf_ad7417_probe()
286 	wf_ad7417_add_sensor(pv, 4, "cpu-current", &wf_ad7417_adc_ops);  in wf_ad7417_probe()
293 	struct wf_ad7417_priv *pv = dev_get_drvdata(&client->dev);  in wf_ad7417_remove()
297 	pv->i2c = NULL;  in wf_ad7417_remove()
301 		wf_unregister_sensor(&pv->sensors[i]);  in wf_ad7417_remove()
303 	kref_put(&pv->ref, wf_ad7417_release);  in wf_ad7417_remove()
334 		return -ENODEV;  in wf_ad7417_init()