177 #define	ADS_PD10_REF_ON		(2 << 0)	/* vREF on + penirq */
178 #define	ADS_PD10_ALL_ON		(3 << 0)	/* ADC + vREF on */
183 #define	READ_12BIT_DFR(x, adc, vref) (ADS_START | ADS_A2A1A0_d_ ## x \  argument
185 	(adc ? ADS_PD10_ADC_ON : 0) | (vref ? ADS_PD10_REF_ON : 0))
187 #define	READ_Y(vref)	(READ_12BIT_DFR(y,  1, vref))  argument
188 #define	READ_Z1(vref)	(READ_12BIT_DFR(z1, 1, vref))  argument
189 #define	READ_Z2(vref)	(READ_12BIT_DFR(z2, 1, vref))  argument
191 #define	READ_X(vref)	(READ_12BIT_DFR(x,  1, vref))  argument
195  * we leave both ADC and VREF powered
308  * The range is GND..vREF. The ads7843 and ads7835 must use external vREF;
309  * ads7846 lets that pin be unconnected, to use internal vREF.
350 	/* maybe turn on internal vREF, and let it settle */  in ads7846_read12_ser()
478  * if we know vREF.  userspace may need to scale vAUX to match the board's  in SHOW()
485 	/* external resistors may scale vAUX into 0..vREF */  in SHOW()
540 			dev_dbg(&spi->dev, "assuming 2.5V internal vREF\n");  in ads784x_hwmon_register()
549 				"external vREF for ADS%d not specified\n",  in ads784x_hwmon_register()
989 	int vref = pdata->keep_vref_on;  in ads7846_setup_spi_msg()  local
994 		 * keep VREF off during differential/ratiometric  in ads7846_setup_spi_msg()
998 		vref = 0;  in ads7846_setup_spi_msg()
1006 		packet->read_y_cmd[0] = READ_Y(vref);  in ads7846_setup_spi_msg()
1015 		packet->read_y = READ_Y(vref);  in ads7846_setup_spi_msg()
1053 		packet->read_x_cmd[0] = READ_X(vref);  in ads7846_setup_spi_msg()
1063 		packet->read_x = READ_X(vref);  in ads7846_setup_spi_msg()
1098 		packet->read_z1 = READ_Z1(vref);  in ads7846_setup_spi_msg()
1130 		packet->read_z2 = READ_Z2(vref);  in ads7846_setup_spi_msg()
1221 	of_property_read_u16(node, "ti,vref-delay-usecs",  in ads7846_probe_dt()
1223 	of_property_read_u16(node, "ti,vref-mv", &pdata->vref_mv);  in ads7846_probe_dt()
1224 	pdata->keep_vref_on = of_property_read_bool(node, "ti,keep-vref-on");  in ads7846_probe_dt()
1445 	 * Take a first sample, leaving nPENIRQ active and vREF off; avoid  in ads7846_probe()