1206 lines
36 KiB
C
1206 lines
36 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* Author: Arun R Murthy <arun.murthy@stericsson.com>
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* Author: Daniel Willerud <daniel.willerud@stericsson.com>
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* Author: Johan Palsson <johan.palsson@stericsson.com>
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* Author: M'boumba Cedric Madianga
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*
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* AB8500 General Purpose ADC driver. The AB8500 uses reference voltages:
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* VinVADC, and VADC relative to GND to do its job. It monitors main and backup
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* battery voltages, AC (mains) voltage, USB cable voltage, as well as voltages
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* representing the temperature of the chip die and battery, accessory
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* detection by resistance measurements using relative voltages and GSM burst
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* information.
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*
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* Some of the voltages are measured on external pins on the IC, such as
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* battery temperature or "ADC aux" 1 and 2. Other voltages are internal rails
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* from other parts of the ASIC such as main charger voltage, main and battery
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* backup voltage or USB VBUS voltage. For this reason drivers for other
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* parts of the system are required to obtain handles to the ADC to do work
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* for them and the IIO driver provides arbitration among these consumers.
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*/
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#include <linux/init.h>
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#include <linux/bits.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/delay.h>
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#include <linux/pm_runtime.h>
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#include <linux/platform_device.h>
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#include <linux/completion.h>
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#include <linux/regulator/consumer.h>
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#include <linux/random.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/mfd/abx500.h>
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#include <linux/mfd/abx500/ab8500.h>
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/* GPADC register offsets and bit definitions */
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#define AB8500_GPADC_CTRL1_REG 0x00
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/* GPADC control register 1 bits */
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#define AB8500_GPADC_CTRL1_DISABLE 0x00
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#define AB8500_GPADC_CTRL1_ENABLE BIT(0)
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#define AB8500_GPADC_CTRL1_TRIG_ENA BIT(1)
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#define AB8500_GPADC_CTRL1_START_SW_CONV BIT(2)
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#define AB8500_GPADC_CTRL1_BTEMP_PULL_UP BIT(3)
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/* 0 = use rising edge, 1 = use falling edge */
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#define AB8500_GPADC_CTRL1_TRIG_EDGE BIT(4)
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/* 0 = use VTVOUT, 1 = use VRTC as pull-up supply for battery temp NTC */
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#define AB8500_GPADC_CTRL1_PUPSUPSEL BIT(5)
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#define AB8500_GPADC_CTRL1_BUF_ENA BIT(6)
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#define AB8500_GPADC_CTRL1_ICHAR_ENA BIT(7)
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#define AB8500_GPADC_CTRL2_REG 0x01
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#define AB8500_GPADC_CTRL3_REG 0x02
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/*
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* GPADC control register 2 and 3 bits
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* the bit layout is the same for SW and HW conversion set-up
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*/
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#define AB8500_GPADC_CTRL2_AVG_1 0x00
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#define AB8500_GPADC_CTRL2_AVG_4 BIT(5)
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#define AB8500_GPADC_CTRL2_AVG_8 BIT(6)
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#define AB8500_GPADC_CTRL2_AVG_16 (BIT(5) | BIT(6))
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enum ab8500_gpadc_channel {
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AB8500_GPADC_CHAN_UNUSED = 0x00,
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AB8500_GPADC_CHAN_BAT_CTRL = 0x01,
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AB8500_GPADC_CHAN_BAT_TEMP = 0x02,
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/* This is not used on AB8505 */
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AB8500_GPADC_CHAN_MAIN_CHARGER = 0x03,
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AB8500_GPADC_CHAN_ACC_DET_1 = 0x04,
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AB8500_GPADC_CHAN_ACC_DET_2 = 0x05,
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AB8500_GPADC_CHAN_ADC_AUX_1 = 0x06,
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AB8500_GPADC_CHAN_ADC_AUX_2 = 0x07,
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AB8500_GPADC_CHAN_VBAT_A = 0x08,
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AB8500_GPADC_CHAN_VBUS = 0x09,
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AB8500_GPADC_CHAN_MAIN_CHARGER_CURRENT = 0x0a,
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AB8500_GPADC_CHAN_USB_CHARGER_CURRENT = 0x0b,
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AB8500_GPADC_CHAN_BACKUP_BAT = 0x0c,
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/* Only on AB8505 */
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AB8505_GPADC_CHAN_DIE_TEMP = 0x0d,
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AB8500_GPADC_CHAN_ID = 0x0e,
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AB8500_GPADC_CHAN_INTERNAL_TEST_1 = 0x0f,
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AB8500_GPADC_CHAN_INTERNAL_TEST_2 = 0x10,
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AB8500_GPADC_CHAN_INTERNAL_TEST_3 = 0x11,
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/* FIXME: Applicable to all ASIC variants? */
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AB8500_GPADC_CHAN_XTAL_TEMP = 0x12,
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AB8500_GPADC_CHAN_VBAT_TRUE_MEAS = 0x13,
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/* FIXME: Doesn't seem to work with pure AB8500 */
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AB8500_GPADC_CHAN_BAT_CTRL_AND_IBAT = 0x1c,
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AB8500_GPADC_CHAN_VBAT_MEAS_AND_IBAT = 0x1d,
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AB8500_GPADC_CHAN_VBAT_TRUE_MEAS_AND_IBAT = 0x1e,
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AB8500_GPADC_CHAN_BAT_TEMP_AND_IBAT = 0x1f,
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/*
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* Virtual channel used only for ibat conversion to ampere.
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* Battery current conversion (ibat) cannot be requested as a
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* single conversion but it is always requested in combination
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* with other input requests.
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*/
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AB8500_GPADC_CHAN_IBAT_VIRTUAL = 0xFF,
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};
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#define AB8500_GPADC_AUTO_TIMER_REG 0x03
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#define AB8500_GPADC_STAT_REG 0x04
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#define AB8500_GPADC_STAT_BUSY BIT(0)
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#define AB8500_GPADC_MANDATAL_REG 0x05
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#define AB8500_GPADC_MANDATAH_REG 0x06
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#define AB8500_GPADC_AUTODATAL_REG 0x07
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#define AB8500_GPADC_AUTODATAH_REG 0x08
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#define AB8500_GPADC_MUX_CTRL_REG 0x09
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#define AB8540_GPADC_MANDATA2L_REG 0x09
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#define AB8540_GPADC_MANDATA2H_REG 0x0A
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#define AB8540_GPADC_APEAAX_REG 0x10
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#define AB8540_GPADC_APEAAT_REG 0x11
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#define AB8540_GPADC_APEAAM_REG 0x12
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#define AB8540_GPADC_APEAAH_REG 0x13
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#define AB8540_GPADC_APEAAL_REG 0x14
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/*
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* OTP register offsets
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* Bank : 0x15
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*/
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#define AB8500_GPADC_CAL_1 0x0F
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#define AB8500_GPADC_CAL_2 0x10
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#define AB8500_GPADC_CAL_3 0x11
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#define AB8500_GPADC_CAL_4 0x12
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#define AB8500_GPADC_CAL_5 0x13
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#define AB8500_GPADC_CAL_6 0x14
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#define AB8500_GPADC_CAL_7 0x15
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/* New calibration for 8540 */
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#define AB8540_GPADC_OTP4_REG_7 0x38
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#define AB8540_GPADC_OTP4_REG_6 0x39
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#define AB8540_GPADC_OTP4_REG_5 0x3A
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#define AB8540_GPADC_DIS_ZERO 0x00
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#define AB8540_GPADC_EN_VBIAS_XTAL_TEMP 0x02
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/* GPADC constants from AB8500 spec, UM0836 */
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#define AB8500_ADC_RESOLUTION 1024
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#define AB8500_ADC_CH_BTEMP_MIN 0
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#define AB8500_ADC_CH_BTEMP_MAX 1350
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#define AB8500_ADC_CH_DIETEMP_MIN 0
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#define AB8500_ADC_CH_DIETEMP_MAX 1350
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#define AB8500_ADC_CH_CHG_V_MIN 0
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#define AB8500_ADC_CH_CHG_V_MAX 20030
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#define AB8500_ADC_CH_ACCDET2_MIN 0
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#define AB8500_ADC_CH_ACCDET2_MAX 2500
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#define AB8500_ADC_CH_VBAT_MIN 2300
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#define AB8500_ADC_CH_VBAT_MAX 4800
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#define AB8500_ADC_CH_CHG_I_MIN 0
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#define AB8500_ADC_CH_CHG_I_MAX 1500
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#define AB8500_ADC_CH_BKBAT_MIN 0
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#define AB8500_ADC_CH_BKBAT_MAX 3200
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/* GPADC constants from AB8540 spec */
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#define AB8500_ADC_CH_IBAT_MIN (-6000) /* mA range measured by ADC for ibat */
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#define AB8500_ADC_CH_IBAT_MAX 6000
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#define AB8500_ADC_CH_IBAT_MIN_V (-60) /* mV range measured by ADC for ibat */
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#define AB8500_ADC_CH_IBAT_MAX_V 60
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#define AB8500_GPADC_IBAT_VDROP_L (-56) /* mV */
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#define AB8500_GPADC_IBAT_VDROP_H 56
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/* This is used to not lose precision when dividing to get gain and offset */
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#define AB8500_GPADC_CALIB_SCALE 1000
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/*
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* Number of bits shift used to not lose precision
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* when dividing to get ibat gain.
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*/
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#define AB8500_GPADC_CALIB_SHIFT_IBAT 20
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/* Time in ms before disabling regulator */
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#define AB8500_GPADC_AUTOSUSPEND_DELAY 1
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#define AB8500_GPADC_CONVERSION_TIME 500 /* ms */
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enum ab8500_cal_channels {
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AB8500_CAL_VMAIN = 0,
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AB8500_CAL_BTEMP,
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AB8500_CAL_VBAT,
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AB8500_CAL_IBAT,
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AB8500_CAL_NR,
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};
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/**
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* struct ab8500_adc_cal_data - Table for storing gain and offset for the
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* calibrated ADC channels
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* @gain: Gain of the ADC channel
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* @offset: Offset of the ADC channel
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* @otp_calib_hi: Calibration from OTP
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* @otp_calib_lo: Calibration from OTP
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*/
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struct ab8500_adc_cal_data {
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s64 gain;
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s64 offset;
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u16 otp_calib_hi;
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u16 otp_calib_lo;
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};
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/**
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* struct ab8500_gpadc_chan_info - per-channel GPADC info
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* @name: name of the channel
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* @id: the internal AB8500 ID number for the channel
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* @hardware_control: indicate that we want to use hardware ADC control
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* on this channel, the default is software ADC control. Hardware control
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* is normally only used to test the battery voltage during GSM bursts
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* and needs a hardware trigger on the GPADCTrig pin of the ASIC.
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* @falling_edge: indicate that we want to trigger on falling edge
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* rather than rising edge, rising edge is the default
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* @avg_sample: how many samples to average: must be 1, 4, 8 or 16.
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* @trig_timer: how long to wait for the trigger, in 32kHz periods:
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* 0 .. 255 periods
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*/
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struct ab8500_gpadc_chan_info {
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const char *name;
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u8 id;
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bool hardware_control;
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bool falling_edge;
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u8 avg_sample;
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u8 trig_timer;
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};
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/**
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* struct ab8500_gpadc - AB8500 GPADC device information
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* @dev: pointer to the containing device
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* @ab8500: pointer to the parent AB8500 device
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* @chans: internal per-channel information container
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* @nchans: number of channels
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* @complete: pointer to the completion that indicates
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* the completion of an gpadc conversion cycle
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* @vddadc: pointer to the regulator supplying VDDADC
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* @irq_sw: interrupt number that is used by gpadc for software ADC conversion
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* @irq_hw: interrupt number that is used by gpadc for hardware ADC conversion
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* @cal_data: array of ADC calibration data structs
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*/
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struct ab8500_gpadc {
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struct device *dev;
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struct ab8500 *ab8500;
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struct ab8500_gpadc_chan_info *chans;
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unsigned int nchans;
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struct completion complete;
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struct regulator *vddadc;
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int irq_sw;
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int irq_hw;
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struct ab8500_adc_cal_data cal_data[AB8500_CAL_NR];
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};
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static struct ab8500_gpadc_chan_info *
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ab8500_gpadc_get_channel(struct ab8500_gpadc *gpadc, u8 chan)
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{
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struct ab8500_gpadc_chan_info *ch;
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int i;
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for (i = 0; i < gpadc->nchans; i++) {
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ch = &gpadc->chans[i];
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if (ch->id == chan)
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break;
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}
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if (i == gpadc->nchans)
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return NULL;
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return ch;
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}
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/**
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* ab8500_gpadc_ad_to_voltage() - Convert a raw ADC value to a voltage
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* @gpadc: GPADC instance
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* @ch: the sampled channel this raw value is coming from
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* @ad_value: the raw value
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*/
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static int ab8500_gpadc_ad_to_voltage(struct ab8500_gpadc *gpadc,
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enum ab8500_gpadc_channel ch,
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int ad_value)
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{
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int res;
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switch (ch) {
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case AB8500_GPADC_CHAN_MAIN_CHARGER:
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/* No calibration data available: just interpolate */
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if (!gpadc->cal_data[AB8500_CAL_VMAIN].gain) {
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res = AB8500_ADC_CH_CHG_V_MIN + (AB8500_ADC_CH_CHG_V_MAX -
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AB8500_ADC_CH_CHG_V_MIN) * ad_value /
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AB8500_ADC_RESOLUTION;
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break;
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}
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/* Here we can use calibration */
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res = (int) (ad_value * gpadc->cal_data[AB8500_CAL_VMAIN].gain +
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gpadc->cal_data[AB8500_CAL_VMAIN].offset) / AB8500_GPADC_CALIB_SCALE;
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break;
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case AB8500_GPADC_CHAN_BAT_CTRL:
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case AB8500_GPADC_CHAN_BAT_TEMP:
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case AB8500_GPADC_CHAN_ACC_DET_1:
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case AB8500_GPADC_CHAN_ADC_AUX_1:
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case AB8500_GPADC_CHAN_ADC_AUX_2:
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case AB8500_GPADC_CHAN_XTAL_TEMP:
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/* No calibration data available: just interpolate */
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if (!gpadc->cal_data[AB8500_CAL_BTEMP].gain) {
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res = AB8500_ADC_CH_BTEMP_MIN + (AB8500_ADC_CH_BTEMP_MAX -
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AB8500_ADC_CH_BTEMP_MIN) * ad_value /
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AB8500_ADC_RESOLUTION;
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break;
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}
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/* Here we can use calibration */
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res = (int) (ad_value * gpadc->cal_data[AB8500_CAL_BTEMP].gain +
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gpadc->cal_data[AB8500_CAL_BTEMP].offset) / AB8500_GPADC_CALIB_SCALE;
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break;
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case AB8500_GPADC_CHAN_VBAT_A:
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case AB8500_GPADC_CHAN_VBAT_TRUE_MEAS:
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/* No calibration data available: just interpolate */
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if (!gpadc->cal_data[AB8500_CAL_VBAT].gain) {
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res = AB8500_ADC_CH_VBAT_MIN + (AB8500_ADC_CH_VBAT_MAX -
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AB8500_ADC_CH_VBAT_MIN) * ad_value /
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AB8500_ADC_RESOLUTION;
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break;
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}
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/* Here we can use calibration */
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res = (int) (ad_value * gpadc->cal_data[AB8500_CAL_VBAT].gain +
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gpadc->cal_data[AB8500_CAL_VBAT].offset) / AB8500_GPADC_CALIB_SCALE;
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break;
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case AB8505_GPADC_CHAN_DIE_TEMP:
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res = AB8500_ADC_CH_DIETEMP_MIN +
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(AB8500_ADC_CH_DIETEMP_MAX - AB8500_ADC_CH_DIETEMP_MIN) * ad_value /
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AB8500_ADC_RESOLUTION;
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break;
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case AB8500_GPADC_CHAN_ACC_DET_2:
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res = AB8500_ADC_CH_ACCDET2_MIN +
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(AB8500_ADC_CH_ACCDET2_MAX - AB8500_ADC_CH_ACCDET2_MIN) * ad_value /
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AB8500_ADC_RESOLUTION;
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break;
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case AB8500_GPADC_CHAN_VBUS:
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res = AB8500_ADC_CH_CHG_V_MIN +
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(AB8500_ADC_CH_CHG_V_MAX - AB8500_ADC_CH_CHG_V_MIN) * ad_value /
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AB8500_ADC_RESOLUTION;
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break;
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case AB8500_GPADC_CHAN_MAIN_CHARGER_CURRENT:
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case AB8500_GPADC_CHAN_USB_CHARGER_CURRENT:
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res = AB8500_ADC_CH_CHG_I_MIN +
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(AB8500_ADC_CH_CHG_I_MAX - AB8500_ADC_CH_CHG_I_MIN) * ad_value /
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AB8500_ADC_RESOLUTION;
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break;
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case AB8500_GPADC_CHAN_BACKUP_BAT:
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res = AB8500_ADC_CH_BKBAT_MIN +
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(AB8500_ADC_CH_BKBAT_MAX - AB8500_ADC_CH_BKBAT_MIN) * ad_value /
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AB8500_ADC_RESOLUTION;
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break;
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case AB8500_GPADC_CHAN_IBAT_VIRTUAL:
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/* No calibration data available: just interpolate */
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if (!gpadc->cal_data[AB8500_CAL_IBAT].gain) {
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res = AB8500_ADC_CH_IBAT_MIN + (AB8500_ADC_CH_IBAT_MAX -
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AB8500_ADC_CH_IBAT_MIN) * ad_value /
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AB8500_ADC_RESOLUTION;
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break;
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}
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/* Here we can use calibration */
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res = (int) (ad_value * gpadc->cal_data[AB8500_CAL_IBAT].gain +
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gpadc->cal_data[AB8500_CAL_IBAT].offset)
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>> AB8500_GPADC_CALIB_SHIFT_IBAT;
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break;
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default:
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dev_err(gpadc->dev,
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"unknown channel ID: %d, not possible to convert\n",
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ch);
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res = -EINVAL;
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break;
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}
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return res;
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}
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static int ab8500_gpadc_read(struct ab8500_gpadc *gpadc,
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const struct ab8500_gpadc_chan_info *ch,
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int *ibat)
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{
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int ret;
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int looplimit = 0;
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unsigned long completion_timeout;
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u8 val;
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u8 low_data, high_data, low_data2, high_data2;
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u8 ctrl1;
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u8 ctrl23;
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unsigned int delay_min = 0;
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unsigned int delay_max = 0;
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u8 data_low_addr, data_high_addr;
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if (!gpadc)
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return -ENODEV;
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/* check if conversion is supported */
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if ((gpadc->irq_sw <= 0) && !ch->hardware_control)
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return -ENOTSUPP;
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if ((gpadc->irq_hw <= 0) && ch->hardware_control)
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return -ENOTSUPP;
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/* Enable vddadc by grabbing PM runtime */
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pm_runtime_get_sync(gpadc->dev);
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/* Check if ADC is not busy, lock and proceed */
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do {
|
|
ret = abx500_get_register_interruptible(gpadc->dev,
|
|
AB8500_GPADC, AB8500_GPADC_STAT_REG, &val);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (!(val & AB8500_GPADC_STAT_BUSY))
|
|
break;
|
|
msleep(20);
|
|
} while (++looplimit < 10);
|
|
if (looplimit >= 10 && (val & AB8500_GPADC_STAT_BUSY)) {
|
|
dev_err(gpadc->dev, "gpadc_conversion: GPADC busy");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Enable GPADC */
|
|
ctrl1 = AB8500_GPADC_CTRL1_ENABLE;
|
|
|
|
/* Select the channel source and set average samples */
|
|
switch (ch->avg_sample) {
|
|
case 1:
|
|
ctrl23 = ch->id | AB8500_GPADC_CTRL2_AVG_1;
|
|
break;
|
|
case 4:
|
|
ctrl23 = ch->id | AB8500_GPADC_CTRL2_AVG_4;
|
|
break;
|
|
case 8:
|
|
ctrl23 = ch->id | AB8500_GPADC_CTRL2_AVG_8;
|
|
break;
|
|
default:
|
|
ctrl23 = ch->id | AB8500_GPADC_CTRL2_AVG_16;
|
|
break;
|
|
}
|
|
|
|
if (ch->hardware_control) {
|
|
ret = abx500_set_register_interruptible(gpadc->dev,
|
|
AB8500_GPADC, AB8500_GPADC_CTRL3_REG, ctrl23);
|
|
ctrl1 |= AB8500_GPADC_CTRL1_TRIG_ENA;
|
|
if (ch->falling_edge)
|
|
ctrl1 |= AB8500_GPADC_CTRL1_TRIG_EDGE;
|
|
} else {
|
|
ret = abx500_set_register_interruptible(gpadc->dev,
|
|
AB8500_GPADC, AB8500_GPADC_CTRL2_REG, ctrl23);
|
|
}
|
|
if (ret < 0) {
|
|
dev_err(gpadc->dev,
|
|
"gpadc_conversion: set avg samples failed\n");
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Enable ADC, buffering, select rising edge and enable ADC path
|
|
* charging current sense if it needed, ABB 3.0 needs some special
|
|
* treatment too.
|
|
*/
|
|
switch (ch->id) {
|
|
case AB8500_GPADC_CHAN_MAIN_CHARGER_CURRENT:
|
|
case AB8500_GPADC_CHAN_USB_CHARGER_CURRENT:
|
|
ctrl1 |= AB8500_GPADC_CTRL1_BUF_ENA |
|
|
AB8500_GPADC_CTRL1_ICHAR_ENA;
|
|
break;
|
|
case AB8500_GPADC_CHAN_BAT_TEMP:
|
|
if (!is_ab8500_2p0_or_earlier(gpadc->ab8500)) {
|
|
ctrl1 |= AB8500_GPADC_CTRL1_BUF_ENA |
|
|
AB8500_GPADC_CTRL1_BTEMP_PULL_UP;
|
|
/*
|
|
* Delay might be needed for ABB8500 cut 3.0, if not,
|
|
* remove when hardware will be available
|
|
*/
|
|
delay_min = 1000; /* Delay in micro seconds */
|
|
delay_max = 10000; /* large range optimises sleepmode */
|
|
break;
|
|
}
|
|
fallthrough;
|
|
default:
|
|
ctrl1 |= AB8500_GPADC_CTRL1_BUF_ENA;
|
|
break;
|
|
}
|
|
|
|
/* Write configuration to control register 1 */
|
|
ret = abx500_set_register_interruptible(gpadc->dev,
|
|
AB8500_GPADC, AB8500_GPADC_CTRL1_REG, ctrl1);
|
|
if (ret < 0) {
|
|
dev_err(gpadc->dev,
|
|
"gpadc_conversion: set Control register failed\n");
|
|
goto out;
|
|
}
|
|
|
|
if (delay_min != 0)
|
|
usleep_range(delay_min, delay_max);
|
|
|
|
if (ch->hardware_control) {
|
|
/* Set trigger delay timer */
|
|
ret = abx500_set_register_interruptible(gpadc->dev,
|
|
AB8500_GPADC, AB8500_GPADC_AUTO_TIMER_REG,
|
|
ch->trig_timer);
|
|
if (ret < 0) {
|
|
dev_err(gpadc->dev,
|
|
"gpadc_conversion: trig timer failed\n");
|
|
goto out;
|
|
}
|
|
completion_timeout = 2 * HZ;
|
|
data_low_addr = AB8500_GPADC_AUTODATAL_REG;
|
|
data_high_addr = AB8500_GPADC_AUTODATAH_REG;
|
|
} else {
|
|
/* Start SW conversion */
|
|
ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
|
|
AB8500_GPADC, AB8500_GPADC_CTRL1_REG,
|
|
AB8500_GPADC_CTRL1_START_SW_CONV,
|
|
AB8500_GPADC_CTRL1_START_SW_CONV);
|
|
if (ret < 0) {
|
|
dev_err(gpadc->dev,
|
|
"gpadc_conversion: start s/w conv failed\n");
|
|
goto out;
|
|
}
|
|
completion_timeout = msecs_to_jiffies(AB8500_GPADC_CONVERSION_TIME);
|
|
data_low_addr = AB8500_GPADC_MANDATAL_REG;
|
|
data_high_addr = AB8500_GPADC_MANDATAH_REG;
|
|
}
|
|
|
|
/* Wait for completion of conversion */
|
|
if (!wait_for_completion_timeout(&gpadc->complete,
|
|
completion_timeout)) {
|
|
dev_err(gpadc->dev,
|
|
"timeout didn't receive GPADC conv interrupt\n");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Read the converted RAW data */
|
|
ret = abx500_get_register_interruptible(gpadc->dev,
|
|
AB8500_GPADC, data_low_addr, &low_data);
|
|
if (ret < 0) {
|
|
dev_err(gpadc->dev,
|
|
"gpadc_conversion: read low data failed\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = abx500_get_register_interruptible(gpadc->dev,
|
|
AB8500_GPADC, data_high_addr, &high_data);
|
|
if (ret < 0) {
|
|
dev_err(gpadc->dev,
|
|
"gpadc_conversion: read high data failed\n");
|
|
goto out;
|
|
}
|
|
|
|
/* Check if double conversion is required */
|
|
if ((ch->id == AB8500_GPADC_CHAN_BAT_CTRL_AND_IBAT) ||
|
|
(ch->id == AB8500_GPADC_CHAN_VBAT_MEAS_AND_IBAT) ||
|
|
(ch->id == AB8500_GPADC_CHAN_VBAT_TRUE_MEAS_AND_IBAT) ||
|
|
(ch->id == AB8500_GPADC_CHAN_BAT_TEMP_AND_IBAT)) {
|
|
|
|
if (ch->hardware_control) {
|
|
/* not supported */
|
|
ret = -ENOTSUPP;
|
|
dev_err(gpadc->dev,
|
|
"gpadc_conversion: only SW double conversion supported\n");
|
|
goto out;
|
|
} else {
|
|
/* Read the converted RAW data 2 */
|
|
ret = abx500_get_register_interruptible(gpadc->dev,
|
|
AB8500_GPADC, AB8540_GPADC_MANDATA2L_REG,
|
|
&low_data2);
|
|
if (ret < 0) {
|
|
dev_err(gpadc->dev,
|
|
"gpadc_conversion: read sw low data 2 failed\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = abx500_get_register_interruptible(gpadc->dev,
|
|
AB8500_GPADC, AB8540_GPADC_MANDATA2H_REG,
|
|
&high_data2);
|
|
if (ret < 0) {
|
|
dev_err(gpadc->dev,
|
|
"gpadc_conversion: read sw high data 2 failed\n");
|
|
goto out;
|
|
}
|
|
if (ibat != NULL) {
|
|
*ibat = (high_data2 << 8) | low_data2;
|
|
} else {
|
|
dev_warn(gpadc->dev,
|
|
"gpadc_conversion: ibat not stored\n");
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
/* Disable GPADC */
|
|
ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
|
|
AB8500_GPADC_CTRL1_REG, AB8500_GPADC_CTRL1_DISABLE);
|
|
if (ret < 0) {
|
|
dev_err(gpadc->dev, "gpadc_conversion: disable gpadc failed\n");
|
|
goto out;
|
|
}
|
|
|
|
/* This eventually drops the regulator */
|
|
pm_runtime_mark_last_busy(gpadc->dev);
|
|
pm_runtime_put_autosuspend(gpadc->dev);
|
|
|
|
return (high_data << 8) | low_data;
|
|
|
|
out:
|
|
/*
|
|
* It has shown to be needed to turn off the GPADC if an error occurs,
|
|
* otherwise we might have problem when waiting for the busy bit in the
|
|
* GPADC status register to go low. In V1.1 there wait_for_completion
|
|
* seems to timeout when waiting for an interrupt.. Not seen in V2.0
|
|
*/
|
|
(void) abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
|
|
AB8500_GPADC_CTRL1_REG, AB8500_GPADC_CTRL1_DISABLE);
|
|
pm_runtime_put(gpadc->dev);
|
|
dev_err(gpadc->dev,
|
|
"gpadc_conversion: Failed to AD convert channel %d\n", ch->id);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ab8500_bm_gpadcconvend_handler() - isr for gpadc conversion completion
|
|
* @irq: irq number
|
|
* @data: pointer to the data passed during request irq
|
|
*
|
|
* This is a interrupt service routine for gpadc conversion completion.
|
|
* Notifies the gpadc completion is completed and the converted raw value
|
|
* can be read from the registers.
|
|
* Returns IRQ status(IRQ_HANDLED)
|
|
*/
|
|
static irqreturn_t ab8500_bm_gpadcconvend_handler(int irq, void *data)
|
|
{
|
|
struct ab8500_gpadc *gpadc = data;
|
|
|
|
complete(&gpadc->complete);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int otp_cal_regs[] = {
|
|
AB8500_GPADC_CAL_1,
|
|
AB8500_GPADC_CAL_2,
|
|
AB8500_GPADC_CAL_3,
|
|
AB8500_GPADC_CAL_4,
|
|
AB8500_GPADC_CAL_5,
|
|
AB8500_GPADC_CAL_6,
|
|
AB8500_GPADC_CAL_7,
|
|
};
|
|
|
|
static int otp4_cal_regs[] = {
|
|
AB8540_GPADC_OTP4_REG_7,
|
|
AB8540_GPADC_OTP4_REG_6,
|
|
AB8540_GPADC_OTP4_REG_5,
|
|
};
|
|
|
|
static void ab8500_gpadc_read_calibration_data(struct ab8500_gpadc *gpadc)
|
|
{
|
|
int i;
|
|
int ret[ARRAY_SIZE(otp_cal_regs)];
|
|
u8 gpadc_cal[ARRAY_SIZE(otp_cal_regs)];
|
|
int ret_otp4[ARRAY_SIZE(otp4_cal_regs)];
|
|
u8 gpadc_otp4[ARRAY_SIZE(otp4_cal_regs)];
|
|
int vmain_high, vmain_low;
|
|
int btemp_high, btemp_low;
|
|
int vbat_high, vbat_low;
|
|
int ibat_high, ibat_low;
|
|
s64 V_gain, V_offset, V2A_gain, V2A_offset;
|
|
|
|
/* First we read all OTP registers and store the error code */
|
|
for (i = 0; i < ARRAY_SIZE(otp_cal_regs); i++) {
|
|
ret[i] = abx500_get_register_interruptible(gpadc->dev,
|
|
AB8500_OTP_EMUL, otp_cal_regs[i], &gpadc_cal[i]);
|
|
if (ret[i] < 0) {
|
|
/* Continue anyway: maybe the other registers are OK */
|
|
dev_err(gpadc->dev, "%s: read otp reg 0x%02x failed\n",
|
|
__func__, otp_cal_regs[i]);
|
|
} else {
|
|
/* Put this in the entropy pool as device-unique */
|
|
add_device_randomness(&ret[i], sizeof(ret[i]));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The ADC calibration data is stored in OTP registers.
|
|
* The layout of the calibration data is outlined below and a more
|
|
* detailed description can be found in UM0836
|
|
*
|
|
* vm_h/l = vmain_high/low
|
|
* bt_h/l = btemp_high/low
|
|
* vb_h/l = vbat_high/low
|
|
*
|
|
* Data bits 8500/9540:
|
|
* | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | | vm_h9 | vm_h8
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | | vm_h7 | vm_h6 | vm_h5 | vm_h4 | vm_h3 | vm_h2
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | vm_h1 | vm_h0 | vm_l4 | vm_l3 | vm_l2 | vm_l1 | vm_l0 | bt_h9
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | bt_h8 | bt_h7 | bt_h6 | bt_h5 | bt_h4 | bt_h3 | bt_h2 | bt_h1
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | bt_h0 | bt_l4 | bt_l3 | bt_l2 | bt_l1 | bt_l0 | vb_h9 | vb_h8
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | vb_h7 | vb_h6 | vb_h5 | vb_h4 | vb_h3 | vb_h2 | vb_h1 | vb_h0
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | vb_l5 | vb_l4 | vb_l3 | vb_l2 | vb_l1 | vb_l0 |
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
*
|
|
* Data bits 8540:
|
|
* OTP2
|
|
* | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* |
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | vm_h9 | vm_h8 | vm_h7 | vm_h6 | vm_h5 | vm_h4 | vm_h3 | vm_h2
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | vm_h1 | vm_h0 | vm_l4 | vm_l3 | vm_l2 | vm_l1 | vm_l0 | bt_h9
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | bt_h8 | bt_h7 | bt_h6 | bt_h5 | bt_h4 | bt_h3 | bt_h2 | bt_h1
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | bt_h0 | bt_l4 | bt_l3 | bt_l2 | bt_l1 | bt_l0 | vb_h9 | vb_h8
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | vb_h7 | vb_h6 | vb_h5 | vb_h4 | vb_h3 | vb_h2 | vb_h1 | vb_h0
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | vb_l5 | vb_l4 | vb_l3 | vb_l2 | vb_l1 | vb_l0 |
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
*
|
|
* Data bits 8540:
|
|
* OTP4
|
|
* | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | | ib_h9 | ib_h8 | ib_h7
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | ib_h6 | ib_h5 | ib_h4 | ib_h3 | ib_h2 | ib_h1 | ib_h0 | ib_l5
|
|
* |.......|.......|.......|.......|.......|.......|.......|.......
|
|
* | ib_l4 | ib_l3 | ib_l2 | ib_l1 | ib_l0 |
|
|
*
|
|
*
|
|
* Ideal output ADC codes corresponding to injected input voltages
|
|
* during manufacturing is:
|
|
*
|
|
* vmain_high: Vin = 19500mV / ADC ideal code = 997
|
|
* vmain_low: Vin = 315mV / ADC ideal code = 16
|
|
* btemp_high: Vin = 1300mV / ADC ideal code = 985
|
|
* btemp_low: Vin = 21mV / ADC ideal code = 16
|
|
* vbat_high: Vin = 4700mV / ADC ideal code = 982
|
|
* vbat_low: Vin = 2380mV / ADC ideal code = 33
|
|
*/
|
|
|
|
if (is_ab8540(gpadc->ab8500)) {
|
|
/* Calculate gain and offset for VMAIN if all reads succeeded*/
|
|
if (!(ret[1] < 0 || ret[2] < 0)) {
|
|
vmain_high = (((gpadc_cal[1] & 0xFF) << 2) |
|
|
((gpadc_cal[2] & 0xC0) >> 6));
|
|
vmain_low = ((gpadc_cal[2] & 0x3E) >> 1);
|
|
|
|
gpadc->cal_data[AB8500_CAL_VMAIN].otp_calib_hi =
|
|
(u16)vmain_high;
|
|
gpadc->cal_data[AB8500_CAL_VMAIN].otp_calib_lo =
|
|
(u16)vmain_low;
|
|
|
|
gpadc->cal_data[AB8500_CAL_VMAIN].gain = AB8500_GPADC_CALIB_SCALE *
|
|
(19500 - 315) / (vmain_high - vmain_low);
|
|
gpadc->cal_data[AB8500_CAL_VMAIN].offset = AB8500_GPADC_CALIB_SCALE *
|
|
19500 - (AB8500_GPADC_CALIB_SCALE * (19500 - 315) /
|
|
(vmain_high - vmain_low)) * vmain_high;
|
|
} else {
|
|
gpadc->cal_data[AB8500_CAL_VMAIN].gain = 0;
|
|
}
|
|
|
|
/* Read IBAT calibration Data */
|
|
for (i = 0; i < ARRAY_SIZE(otp4_cal_regs); i++) {
|
|
ret_otp4[i] = abx500_get_register_interruptible(
|
|
gpadc->dev, AB8500_OTP_EMUL,
|
|
otp4_cal_regs[i], &gpadc_otp4[i]);
|
|
if (ret_otp4[i] < 0)
|
|
dev_err(gpadc->dev,
|
|
"%s: read otp4 reg 0x%02x failed\n",
|
|
__func__, otp4_cal_regs[i]);
|
|
}
|
|
|
|
/* Calculate gain and offset for IBAT if all reads succeeded */
|
|
if (!(ret_otp4[0] < 0 || ret_otp4[1] < 0 || ret_otp4[2] < 0)) {
|
|
ibat_high = (((gpadc_otp4[0] & 0x07) << 7) |
|
|
((gpadc_otp4[1] & 0xFE) >> 1));
|
|
ibat_low = (((gpadc_otp4[1] & 0x01) << 5) |
|
|
((gpadc_otp4[2] & 0xF8) >> 3));
|
|
|
|
gpadc->cal_data[AB8500_CAL_IBAT].otp_calib_hi =
|
|
(u16)ibat_high;
|
|
gpadc->cal_data[AB8500_CAL_IBAT].otp_calib_lo =
|
|
(u16)ibat_low;
|
|
|
|
V_gain = ((AB8500_GPADC_IBAT_VDROP_H - AB8500_GPADC_IBAT_VDROP_L)
|
|
<< AB8500_GPADC_CALIB_SHIFT_IBAT) / (ibat_high - ibat_low);
|
|
|
|
V_offset = (AB8500_GPADC_IBAT_VDROP_H << AB8500_GPADC_CALIB_SHIFT_IBAT) -
|
|
(((AB8500_GPADC_IBAT_VDROP_H - AB8500_GPADC_IBAT_VDROP_L) <<
|
|
AB8500_GPADC_CALIB_SHIFT_IBAT) / (ibat_high - ibat_low))
|
|
* ibat_high;
|
|
/*
|
|
* Result obtained is in mV (at a scale factor),
|
|
* we need to calculate gain and offset to get mA
|
|
*/
|
|
V2A_gain = (AB8500_ADC_CH_IBAT_MAX - AB8500_ADC_CH_IBAT_MIN)/
|
|
(AB8500_ADC_CH_IBAT_MAX_V - AB8500_ADC_CH_IBAT_MIN_V);
|
|
V2A_offset = ((AB8500_ADC_CH_IBAT_MAX_V * AB8500_ADC_CH_IBAT_MIN -
|
|
AB8500_ADC_CH_IBAT_MAX * AB8500_ADC_CH_IBAT_MIN_V)
|
|
<< AB8500_GPADC_CALIB_SHIFT_IBAT)
|
|
/ (AB8500_ADC_CH_IBAT_MAX_V - AB8500_ADC_CH_IBAT_MIN_V);
|
|
|
|
gpadc->cal_data[AB8500_CAL_IBAT].gain =
|
|
V_gain * V2A_gain;
|
|
gpadc->cal_data[AB8500_CAL_IBAT].offset =
|
|
V_offset * V2A_gain + V2A_offset;
|
|
} else {
|
|
gpadc->cal_data[AB8500_CAL_IBAT].gain = 0;
|
|
}
|
|
} else {
|
|
/* Calculate gain and offset for VMAIN if all reads succeeded */
|
|
if (!(ret[0] < 0 || ret[1] < 0 || ret[2] < 0)) {
|
|
vmain_high = (((gpadc_cal[0] & 0x03) << 8) |
|
|
((gpadc_cal[1] & 0x3F) << 2) |
|
|
((gpadc_cal[2] & 0xC0) >> 6));
|
|
vmain_low = ((gpadc_cal[2] & 0x3E) >> 1);
|
|
|
|
gpadc->cal_data[AB8500_CAL_VMAIN].otp_calib_hi =
|
|
(u16)vmain_high;
|
|
gpadc->cal_data[AB8500_CAL_VMAIN].otp_calib_lo =
|
|
(u16)vmain_low;
|
|
|
|
gpadc->cal_data[AB8500_CAL_VMAIN].gain = AB8500_GPADC_CALIB_SCALE *
|
|
(19500 - 315) / (vmain_high - vmain_low);
|
|
|
|
gpadc->cal_data[AB8500_CAL_VMAIN].offset = AB8500_GPADC_CALIB_SCALE *
|
|
19500 - (AB8500_GPADC_CALIB_SCALE * (19500 - 315) /
|
|
(vmain_high - vmain_low)) * vmain_high;
|
|
} else {
|
|
gpadc->cal_data[AB8500_CAL_VMAIN].gain = 0;
|
|
}
|
|
}
|
|
|
|
/* Calculate gain and offset for BTEMP if all reads succeeded */
|
|
if (!(ret[2] < 0 || ret[3] < 0 || ret[4] < 0)) {
|
|
btemp_high = (((gpadc_cal[2] & 0x01) << 9) |
|
|
(gpadc_cal[3] << 1) | ((gpadc_cal[4] & 0x80) >> 7));
|
|
btemp_low = ((gpadc_cal[4] & 0x7C) >> 2);
|
|
|
|
gpadc->cal_data[AB8500_CAL_BTEMP].otp_calib_hi = (u16)btemp_high;
|
|
gpadc->cal_data[AB8500_CAL_BTEMP].otp_calib_lo = (u16)btemp_low;
|
|
|
|
gpadc->cal_data[AB8500_CAL_BTEMP].gain =
|
|
AB8500_GPADC_CALIB_SCALE * (1300 - 21) / (btemp_high - btemp_low);
|
|
gpadc->cal_data[AB8500_CAL_BTEMP].offset = AB8500_GPADC_CALIB_SCALE * 1300 -
|
|
(AB8500_GPADC_CALIB_SCALE * (1300 - 21) / (btemp_high - btemp_low))
|
|
* btemp_high;
|
|
} else {
|
|
gpadc->cal_data[AB8500_CAL_BTEMP].gain = 0;
|
|
}
|
|
|
|
/* Calculate gain and offset for VBAT if all reads succeeded */
|
|
if (!(ret[4] < 0 || ret[5] < 0 || ret[6] < 0)) {
|
|
vbat_high = (((gpadc_cal[4] & 0x03) << 8) | gpadc_cal[5]);
|
|
vbat_low = ((gpadc_cal[6] & 0xFC) >> 2);
|
|
|
|
gpadc->cal_data[AB8500_CAL_VBAT].otp_calib_hi = (u16)vbat_high;
|
|
gpadc->cal_data[AB8500_CAL_VBAT].otp_calib_lo = (u16)vbat_low;
|
|
|
|
gpadc->cal_data[AB8500_CAL_VBAT].gain = AB8500_GPADC_CALIB_SCALE *
|
|
(4700 - 2380) / (vbat_high - vbat_low);
|
|
gpadc->cal_data[AB8500_CAL_VBAT].offset = AB8500_GPADC_CALIB_SCALE * 4700 -
|
|
(AB8500_GPADC_CALIB_SCALE * (4700 - 2380) /
|
|
(vbat_high - vbat_low)) * vbat_high;
|
|
} else {
|
|
gpadc->cal_data[AB8500_CAL_VBAT].gain = 0;
|
|
}
|
|
}
|
|
|
|
static int ab8500_gpadc_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val, int *val2, long mask)
|
|
{
|
|
struct ab8500_gpadc *gpadc = iio_priv(indio_dev);
|
|
const struct ab8500_gpadc_chan_info *ch;
|
|
int raw_val;
|
|
int processed;
|
|
|
|
ch = ab8500_gpadc_get_channel(gpadc, chan->address);
|
|
if (!ch) {
|
|
dev_err(gpadc->dev, "no such channel %lu\n",
|
|
chan->address);
|
|
return -EINVAL;
|
|
}
|
|
|
|
raw_val = ab8500_gpadc_read(gpadc, ch, NULL);
|
|
if (raw_val < 0)
|
|
return raw_val;
|
|
|
|
if (mask == IIO_CHAN_INFO_RAW) {
|
|
*val = raw_val;
|
|
return IIO_VAL_INT;
|
|
}
|
|
|
|
if (mask == IIO_CHAN_INFO_PROCESSED) {
|
|
processed = ab8500_gpadc_ad_to_voltage(gpadc, ch->id, raw_val);
|
|
if (processed < 0)
|
|
return processed;
|
|
|
|
/* Return millivolt or milliamps or millicentigrades */
|
|
*val = processed;
|
|
return IIO_VAL_INT;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int ab8500_gpadc_fwnode_xlate(struct iio_dev *indio_dev,
|
|
const struct fwnode_reference_args *iiospec)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < indio_dev->num_channels; i++)
|
|
if (indio_dev->channels[i].channel == iiospec->args[0])
|
|
return i;
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static const struct iio_info ab8500_gpadc_info = {
|
|
.fwnode_xlate = ab8500_gpadc_fwnode_xlate,
|
|
.read_raw = ab8500_gpadc_read_raw,
|
|
};
|
|
|
|
static int ab8500_gpadc_runtime_suspend(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct ab8500_gpadc *gpadc = iio_priv(indio_dev);
|
|
|
|
regulator_disable(gpadc->vddadc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ab8500_gpadc_runtime_resume(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct ab8500_gpadc *gpadc = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
ret = regulator_enable(gpadc->vddadc);
|
|
if (ret)
|
|
dev_err(dev, "Failed to enable vddadc: %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ab8500_gpadc_parse_channel() - process devicetree channel configuration
|
|
* @dev: pointer to containing device
|
|
* @fwnode: fw node for the channel to configure
|
|
* @ch: channel info to fill in
|
|
* @iio_chan: IIO channel specification to fill in
|
|
*
|
|
* The devicetree will set up the channel for use with the specific device,
|
|
* and define usage for things like AUX GPADC inputs more precisely.
|
|
*/
|
|
static int ab8500_gpadc_parse_channel(struct device *dev,
|
|
struct fwnode_handle *fwnode,
|
|
struct ab8500_gpadc_chan_info *ch,
|
|
struct iio_chan_spec *iio_chan)
|
|
{
|
|
const char *name = fwnode_get_name(fwnode);
|
|
u32 chan;
|
|
int ret;
|
|
|
|
ret = fwnode_property_read_u32(fwnode, "reg", &chan);
|
|
if (ret) {
|
|
dev_err(dev, "invalid channel number %s\n", name);
|
|
return ret;
|
|
}
|
|
if (chan > AB8500_GPADC_CHAN_BAT_TEMP_AND_IBAT) {
|
|
dev_err(dev, "%s channel number out of range %d\n", name, chan);
|
|
return -EINVAL;
|
|
}
|
|
|
|
iio_chan->channel = chan;
|
|
iio_chan->datasheet_name = name;
|
|
iio_chan->indexed = 1;
|
|
iio_chan->address = chan;
|
|
iio_chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
|
BIT(IIO_CHAN_INFO_PROCESSED);
|
|
/* Most are voltages (also temperatures), some are currents */
|
|
if ((chan == AB8500_GPADC_CHAN_MAIN_CHARGER_CURRENT) ||
|
|
(chan == AB8500_GPADC_CHAN_USB_CHARGER_CURRENT))
|
|
iio_chan->type = IIO_CURRENT;
|
|
else
|
|
iio_chan->type = IIO_VOLTAGE;
|
|
|
|
ch->id = chan;
|
|
|
|
/* Sensible defaults */
|
|
ch->avg_sample = 16;
|
|
ch->hardware_control = false;
|
|
ch->falling_edge = false;
|
|
ch->trig_timer = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ab8500_gpadc_parse_channels() - Parse the GPADC channels from DT
|
|
* @gpadc: the GPADC to configure the channels for
|
|
* @chans: the IIO channels we parsed
|
|
* @nchans: the number of IIO channels we parsed
|
|
*/
|
|
static int ab8500_gpadc_parse_channels(struct ab8500_gpadc *gpadc,
|
|
struct iio_chan_spec **chans_parsed,
|
|
unsigned int *nchans_parsed)
|
|
{
|
|
struct fwnode_handle *child;
|
|
struct ab8500_gpadc_chan_info *ch;
|
|
struct iio_chan_spec *iio_chans;
|
|
unsigned int nchans;
|
|
int i;
|
|
|
|
nchans = device_get_child_node_count(gpadc->dev);
|
|
if (!nchans) {
|
|
dev_err(gpadc->dev, "no channel children\n");
|
|
return -ENODEV;
|
|
}
|
|
dev_info(gpadc->dev, "found %d ADC channels\n", nchans);
|
|
|
|
iio_chans = devm_kcalloc(gpadc->dev, nchans,
|
|
sizeof(*iio_chans), GFP_KERNEL);
|
|
if (!iio_chans)
|
|
return -ENOMEM;
|
|
|
|
gpadc->chans = devm_kcalloc(gpadc->dev, nchans,
|
|
sizeof(*gpadc->chans), GFP_KERNEL);
|
|
if (!gpadc->chans)
|
|
return -ENOMEM;
|
|
|
|
i = 0;
|
|
device_for_each_child_node(gpadc->dev, child) {
|
|
struct iio_chan_spec *iio_chan;
|
|
int ret;
|
|
|
|
ch = &gpadc->chans[i];
|
|
iio_chan = &iio_chans[i];
|
|
|
|
ret = ab8500_gpadc_parse_channel(gpadc->dev, child, ch,
|
|
iio_chan);
|
|
if (ret) {
|
|
fwnode_handle_put(child);
|
|
return ret;
|
|
}
|
|
i++;
|
|
}
|
|
gpadc->nchans = nchans;
|
|
*chans_parsed = iio_chans;
|
|
*nchans_parsed = nchans;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ab8500_gpadc_probe(struct platform_device *pdev)
|
|
{
|
|
struct ab8500_gpadc *gpadc;
|
|
struct iio_dev *indio_dev;
|
|
struct device *dev = &pdev->dev;
|
|
struct iio_chan_spec *iio_chans;
|
|
unsigned int n_iio_chans;
|
|
int ret;
|
|
|
|
indio_dev = devm_iio_device_alloc(dev, sizeof(*gpadc));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, indio_dev);
|
|
gpadc = iio_priv(indio_dev);
|
|
|
|
gpadc->dev = dev;
|
|
gpadc->ab8500 = dev_get_drvdata(dev->parent);
|
|
|
|
ret = ab8500_gpadc_parse_channels(gpadc, &iio_chans, &n_iio_chans);
|
|
if (ret)
|
|
return ret;
|
|
|
|
gpadc->irq_sw = platform_get_irq_byname(pdev, "SW_CONV_END");
|
|
if (gpadc->irq_sw < 0)
|
|
return gpadc->irq_sw;
|
|
|
|
if (is_ab8500(gpadc->ab8500)) {
|
|
gpadc->irq_hw = platform_get_irq_byname(pdev, "HW_CONV_END");
|
|
if (gpadc->irq_hw < 0)
|
|
return gpadc->irq_hw;
|
|
} else {
|
|
gpadc->irq_hw = 0;
|
|
}
|
|
|
|
/* Initialize completion used to notify completion of conversion */
|
|
init_completion(&gpadc->complete);
|
|
|
|
/* Request interrupts */
|
|
ret = devm_request_threaded_irq(dev, gpadc->irq_sw, NULL,
|
|
ab8500_bm_gpadcconvend_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
|
|
"ab8500-gpadc-sw", gpadc);
|
|
if (ret < 0) {
|
|
dev_err(dev,
|
|
"failed to request sw conversion irq %d\n",
|
|
gpadc->irq_sw);
|
|
return ret;
|
|
}
|
|
|
|
if (gpadc->irq_hw) {
|
|
ret = devm_request_threaded_irq(dev, gpadc->irq_hw, NULL,
|
|
ab8500_bm_gpadcconvend_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
|
|
"ab8500-gpadc-hw", gpadc);
|
|
if (ret < 0) {
|
|
dev_err(dev,
|
|
"Failed to request hw conversion irq: %d\n",
|
|
gpadc->irq_hw);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* The VTVout LDO used to power the AB8500 GPADC */
|
|
gpadc->vddadc = devm_regulator_get(dev, "vddadc");
|
|
if (IS_ERR(gpadc->vddadc))
|
|
return dev_err_probe(dev, PTR_ERR(gpadc->vddadc),
|
|
"failed to get vddadc\n");
|
|
|
|
ret = regulator_enable(gpadc->vddadc);
|
|
if (ret) {
|
|
dev_err(dev, "failed to enable vddadc: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* Enable runtime PM */
|
|
pm_runtime_get_noresume(dev);
|
|
pm_runtime_set_active(dev);
|
|
pm_runtime_enable(dev);
|
|
pm_runtime_set_autosuspend_delay(dev, AB8500_GPADC_AUTOSUSPEND_DELAY);
|
|
pm_runtime_use_autosuspend(dev);
|
|
|
|
ab8500_gpadc_read_calibration_data(gpadc);
|
|
|
|
pm_runtime_put(dev);
|
|
|
|
indio_dev->name = "ab8500-gpadc";
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->info = &ab8500_gpadc_info;
|
|
indio_dev->channels = iio_chans;
|
|
indio_dev->num_channels = n_iio_chans;
|
|
|
|
ret = devm_iio_device_register(dev, indio_dev);
|
|
if (ret)
|
|
goto out_dis_pm;
|
|
|
|
return 0;
|
|
|
|
out_dis_pm:
|
|
pm_runtime_get_sync(dev);
|
|
pm_runtime_put_noidle(dev);
|
|
pm_runtime_disable(dev);
|
|
regulator_disable(gpadc->vddadc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void ab8500_gpadc_remove(struct platform_device *pdev)
|
|
{
|
|
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
|
|
struct ab8500_gpadc *gpadc = iio_priv(indio_dev);
|
|
|
|
pm_runtime_get_sync(gpadc->dev);
|
|
pm_runtime_put_noidle(gpadc->dev);
|
|
pm_runtime_disable(gpadc->dev);
|
|
regulator_disable(gpadc->vddadc);
|
|
}
|
|
|
|
static DEFINE_RUNTIME_DEV_PM_OPS(ab8500_gpadc_pm_ops,
|
|
ab8500_gpadc_runtime_suspend,
|
|
ab8500_gpadc_runtime_resume, NULL);
|
|
|
|
static struct platform_driver ab8500_gpadc_driver = {
|
|
.probe = ab8500_gpadc_probe,
|
|
.remove_new = ab8500_gpadc_remove,
|
|
.driver = {
|
|
.name = "ab8500-gpadc",
|
|
.pm = pm_ptr(&ab8500_gpadc_pm_ops),
|
|
},
|
|
};
|
|
builtin_platform_driver(ab8500_gpadc_driver);
|