179 #define	ADS_PD10_REF_ON		(2 << 0)	/* vREF on + penirq */
180 #define	ADS_PD10_ALL_ON		(3 << 0)	/* ADC + vREF on */
185 #define	READ_12BIT_DFR(x, adc, vref) (ADS_START | ADS_A2A1A0_d_ ## x \  argument
187 	(adc ? ADS_PD10_ADC_ON : 0) | (vref ? ADS_PD10_REF_ON : 0))
189 #define	READ_Y(vref)	(READ_12BIT_DFR(y,  1, vref))  argument
190 #define	READ_Z1(vref)	(READ_12BIT_DFR(z1, 1, vref))  argument
191 #define	READ_Z2(vref)	(READ_12BIT_DFR(z2, 1, vref))  argument
192 #define	READ_X(vref)	(READ_12BIT_DFR(x,  1, vref))  argument
196  * we leave both ADC and VREF powered
204 /* Order commands in the most optimal way to reduce Vref switching and
206  * Measure:  X; Vref: X+, X-; IN: Y+
207  * Measure:  Y; Vref: Y+, Y-; IN: X+
208  * Measure: Z1; Vref: Y+, X-; IN: X+
209  * Measure: Z2; Vref: Y+, X-; IN: Y-
324  * The range is GND..vREF. The ads7843 and ads7835 must use external vREF;
325  * ads7846 lets that pin be unconnected, to use internal vREF.
366 	/* maybe turn on internal vREF, and let it settle */  in ads7846_read12_ser()
494  * if we know vREF.  userspace may need to scale vAUX to match the board's  in SHOW()
501 	/* external resistors may scale vAUX into 0..vREF */  in SHOW()
558 			dev_dbg(&spi->dev, "assuming 2.5V internal vREF\n");  in ads784x_hwmon_register()
567 				"external vREF for ADS%d not specified\n",  in ads784x_hwmon_register()
718 static u8 ads7846_get_cmd(enum ads7846_cmds cmd_idx, int vref)  in ads7846_get_cmd()  argument
722 		return READ_Y(vref);  in ads7846_get_cmd()
724 		return READ_X(vref);  in ads7846_get_cmd()
728 		return READ_Z1(vref);  in ads7846_get_cmd()
730 		return READ_Z2(vref);  in ads7846_get_cmd()
1037 	int vref = pdata->keep_vref_on;  in ads7846_setup_spi_msg()  local
1091 		 * keep VREF off during differential/ratiometric  in ads7846_setup_spi_msg()
1095 		vref = 0;  in ads7846_setup_spi_msg()
1109 		cmd = ads7846_get_cmd(cmd_idx, vref);  in ads7846_setup_spi_msg()
1154 	device_property_read_u16(dev, "ti,vref-delay-usecs",  in ads7846_get_props()
1156 	device_property_read_u16(dev, "ti,vref-mv", &pdata->vref_mv);  in ads7846_get_props()
1157 	pdata->keep_vref_on = device_property_read_bool(dev, "ti,keep-vref-on");  in ads7846_get_props()
1382 	 * Take a first sample, leaving nPENIRQ active and vREF off; avoid  in ads7846_probe()