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993 lines
24 KiB
993 lines
24 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* TWL6030 GPADC module driver |
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* |
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* Copyright (C) 2009-2013 Texas Instruments Inc. |
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* Nishant Kamat <[email protected]> |
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* Balaji T K <[email protected]> |
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* Graeme Gregory <[email protected]> |
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* Girish S Ghongdemath <[email protected]> |
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* Ambresh K <[email protected]> |
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* Oleksandr Kozaruk <[email protected] |
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* |
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* Based on twl4030-madc.c |
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* Copyright (C) 2008 Nokia Corporation |
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* Mikko Ylinen <[email protected]> |
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*/ |
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#include <linux/interrupt.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/of_platform.h> |
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#include <linux/mfd/twl.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#define DRIVER_NAME "twl6030_gpadc" |
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|
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/* |
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* twl6030 per TRM has 17 channels, and twl6032 has 19 channels |
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* 2 test network channels are not used, |
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* 2 die temperature channels are not used either, as it is not |
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* defined how to convert ADC value to temperature |
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*/ |
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#define TWL6030_GPADC_USED_CHANNELS 13 |
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#define TWL6030_GPADC_MAX_CHANNELS 15 |
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#define TWL6032_GPADC_USED_CHANNELS 15 |
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#define TWL6032_GPADC_MAX_CHANNELS 19 |
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#define TWL6030_GPADC_NUM_TRIM_REGS 16 |
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#define TWL6030_GPADC_CTRL_P1 0x05 |
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#define TWL6032_GPADC_GPSELECT_ISB 0x07 |
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#define TWL6032_GPADC_CTRL_P1 0x08 |
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#define TWL6032_GPADC_GPCH0_LSB 0x0d |
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#define TWL6032_GPADC_GPCH0_MSB 0x0e |
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#define TWL6030_GPADC_CTRL_P1_SP1 BIT(3) |
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#define TWL6030_GPADC_GPCH0_LSB (0x29) |
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#define TWL6030_GPADC_RT_SW1_EOC_MASK BIT(5) |
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#define TWL6030_GPADC_TRIM1 0xCD |
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#define TWL6030_REG_TOGGLE1 0x90 |
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#define TWL6030_GPADCS BIT(1) |
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#define TWL6030_GPADCR BIT(0) |
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/** |
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* struct twl6030_chnl_calib - channel calibration |
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* @gain: slope coefficient for ideal curve |
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* @gain_error: gain error |
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* @offset_error: offset of the real curve |
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*/ |
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struct twl6030_chnl_calib { |
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s32 gain; |
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s32 gain_error; |
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s32 offset_error; |
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}; |
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|
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/** |
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* struct twl6030_ideal_code - GPADC calibration parameters |
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* GPADC is calibrated in two points: close to the beginning and |
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* to the and of the measurable input range |
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* |
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* @channel: channel number |
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* @code1: ideal code for the input at the beginning |
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* @code2: ideal code for at the end of the range |
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* @volt1: voltage input at the beginning(low voltage) |
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* @volt2: voltage input at the end(high voltage) |
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*/ |
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struct twl6030_ideal_code { |
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int channel; |
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u16 code1; |
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u16 code2; |
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u16 volt1; |
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u16 volt2; |
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}; |
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struct twl6030_gpadc_data; |
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/** |
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* struct twl6030_gpadc_platform_data - platform specific data |
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* @nchannels: number of GPADC channels |
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* @iio_channels: iio channels |
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* @ideal: pointer to calibration parameters |
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* @start_conversion: pointer to ADC start conversion function |
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* @channel_to_reg: pointer to ADC function to convert channel to |
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* register address for reading conversion result |
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* @calibrate: pointer to calibration function |
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*/ |
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struct twl6030_gpadc_platform_data { |
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const int nchannels; |
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const struct iio_chan_spec *iio_channels; |
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const struct twl6030_ideal_code *ideal; |
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int (*start_conversion)(int channel); |
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u8 (*channel_to_reg)(int channel); |
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int (*calibrate)(struct twl6030_gpadc_data *gpadc); |
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}; |
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/** |
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* struct twl6030_gpadc_data - GPADC data |
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* @dev: device pointer |
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* @lock: mutual exclusion lock for the structure |
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* @irq_complete: completion to signal end of conversion |
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* @twl6030_cal_tbl: pointer to calibration data for each |
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* channel with gain error and offset |
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* @pdata: pointer to device specific data |
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*/ |
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struct twl6030_gpadc_data { |
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struct device *dev; |
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struct mutex lock; |
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struct completion irq_complete; |
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struct twl6030_chnl_calib *twl6030_cal_tbl; |
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const struct twl6030_gpadc_platform_data *pdata; |
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}; |
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/* |
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* channels 11, 12, 13, 15 and 16 have no calibration data |
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* calibration offset is same for channels 1, 3, 4, 5 |
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* |
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* The data is taken from GPADC_TRIM registers description. |
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* GPADC_TRIM registers keep difference between the code measured |
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* at volt1 and volt2 input voltages and corresponding code1 and code2 |
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*/ |
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static const struct twl6030_ideal_code |
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twl6030_ideal[TWL6030_GPADC_USED_CHANNELS] = { |
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[0] = { /* ch 0, external, battery type, resistor value */ |
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.channel = 0, |
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.code1 = 116, |
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.code2 = 745, |
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.volt1 = 141, |
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.volt2 = 910, |
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}, |
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[1] = { /* ch 1, external, battery temperature, NTC resistor value */ |
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.channel = 1, |
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.code1 = 82, |
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.code2 = 900, |
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.volt1 = 100, |
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.volt2 = 1100, |
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}, |
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[2] = { /* ch 2, external, audio accessory/general purpose */ |
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.channel = 2, |
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.code1 = 55, |
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.code2 = 818, |
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.volt1 = 101, |
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.volt2 = 1499, |
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}, |
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[3] = { /* ch 3, external, general purpose */ |
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.channel = 3, |
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.code1 = 82, |
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.code2 = 900, |
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.volt1 = 100, |
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.volt2 = 1100, |
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}, |
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[4] = { /* ch 4, external, temperature measurement/general purpose */ |
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.channel = 4, |
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.code1 = 82, |
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.code2 = 900, |
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.volt1 = 100, |
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.volt2 = 1100, |
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}, |
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[5] = { /* ch 5, external, general purpose */ |
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.channel = 5, |
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.code1 = 82, |
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.code2 = 900, |
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.volt1 = 100, |
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.volt2 = 1100, |
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}, |
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[6] = { /* ch 6, external, general purpose */ |
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.channel = 6, |
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.code1 = 82, |
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.code2 = 900, |
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.volt1 = 100, |
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.volt2 = 1100, |
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}, |
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[7] = { /* ch 7, internal, main battery */ |
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.channel = 7, |
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.code1 = 614, |
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.code2 = 941, |
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.volt1 = 3001, |
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.volt2 = 4599, |
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}, |
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[8] = { /* ch 8, internal, backup battery */ |
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.channel = 8, |
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.code1 = 82, |
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.code2 = 688, |
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.volt1 = 501, |
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.volt2 = 4203, |
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}, |
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[9] = { /* ch 9, internal, external charger input */ |
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.channel = 9, |
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.code1 = 182, |
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.code2 = 818, |
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.volt1 = 2001, |
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.volt2 = 8996, |
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}, |
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[10] = { /* ch 10, internal, VBUS */ |
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.channel = 10, |
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.code1 = 149, |
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.code2 = 818, |
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.volt1 = 1001, |
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.volt2 = 5497, |
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}, |
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[11] = { /* ch 11, internal, VBUS charging current */ |
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.channel = 11, |
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}, |
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/* ch 12, internal, Die temperature */ |
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/* ch 13, internal, Die temperature */ |
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[12] = { /* ch 14, internal, USB ID line */ |
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.channel = 14, |
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.code1 = 48, |
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.code2 = 714, |
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.volt1 = 323, |
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.volt2 = 4800, |
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}, |
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}; |
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static const struct twl6030_ideal_code |
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twl6032_ideal[TWL6032_GPADC_USED_CHANNELS] = { |
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[0] = { /* ch 0, external, battery type, resistor value */ |
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.channel = 0, |
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.code1 = 1441, |
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.code2 = 3276, |
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.volt1 = 440, |
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.volt2 = 1000, |
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}, |
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[1] = { /* ch 1, external, battery temperature, NTC resistor value */ |
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.channel = 1, |
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.code1 = 1441, |
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.code2 = 3276, |
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.volt1 = 440, |
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.volt2 = 1000, |
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}, |
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[2] = { /* ch 2, external, audio accessory/general purpose */ |
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.channel = 2, |
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.code1 = 1441, |
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.code2 = 3276, |
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.volt1 = 660, |
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.volt2 = 1500, |
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}, |
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[3] = { /* ch 3, external, temperature with external diode/general |
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purpose */ |
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.channel = 3, |
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.code1 = 1441, |
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.code2 = 3276, |
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.volt1 = 440, |
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.volt2 = 1000, |
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}, |
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[4] = { /* ch 4, external, temperature measurement/general purpose */ |
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.channel = 4, |
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.code1 = 1441, |
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.code2 = 3276, |
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.volt1 = 440, |
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.volt2 = 1000, |
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}, |
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[5] = { /* ch 5, external, general purpose */ |
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.channel = 5, |
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.code1 = 1441, |
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.code2 = 3276, |
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.volt1 = 440, |
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.volt2 = 1000, |
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}, |
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[6] = { /* ch 6, external, general purpose */ |
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.channel = 6, |
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.code1 = 1441, |
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.code2 = 3276, |
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.volt1 = 440, |
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.volt2 = 1000, |
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}, |
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[7] = { /* ch7, internal, system supply */ |
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.channel = 7, |
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.code1 = 1441, |
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.code2 = 3276, |
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.volt1 = 2200, |
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.volt2 = 5000, |
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}, |
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[8] = { /* ch8, internal, backup battery */ |
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.channel = 8, |
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.code1 = 1441, |
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.code2 = 3276, |
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.volt1 = 2200, |
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.volt2 = 5000, |
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}, |
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[9] = { /* ch 9, internal, external charger input */ |
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.channel = 9, |
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.code1 = 1441, |
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.code2 = 3276, |
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.volt1 = 3960, |
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.volt2 = 9000, |
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}, |
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[10] = { /* ch10, internal, VBUS */ |
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.channel = 10, |
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.code1 = 150, |
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.code2 = 751, |
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.volt1 = 1000, |
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.volt2 = 5000, |
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}, |
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[11] = { /* ch 11, internal, VBUS DC-DC output current */ |
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.channel = 11, |
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.code1 = 1441, |
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.code2 = 3276, |
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.volt1 = 660, |
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.volt2 = 1500, |
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}, |
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/* ch 12, internal, Die temperature */ |
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/* ch 13, internal, Die temperature */ |
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[12] = { /* ch 14, internal, USB ID line */ |
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.channel = 14, |
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.code1 = 1441, |
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.code2 = 3276, |
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.volt1 = 2420, |
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.volt2 = 5500, |
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}, |
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/* ch 15, internal, test network */ |
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/* ch 16, internal, test network */ |
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[13] = { /* ch 17, internal, battery charging current */ |
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.channel = 17, |
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}, |
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[14] = { /* ch 18, internal, battery voltage */ |
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.channel = 18, |
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.code1 = 1441, |
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.code2 = 3276, |
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.volt1 = 2200, |
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.volt2 = 5000, |
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}, |
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}; |
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static inline int twl6030_gpadc_write(u8 reg, u8 val) |
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{ |
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return twl_i2c_write_u8(TWL6030_MODULE_GPADC, val, reg); |
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} |
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static inline int twl6030_gpadc_read(u8 reg, u8 *val) |
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{ |
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return twl_i2c_read(TWL6030_MODULE_GPADC, val, reg, 2); |
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} |
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static int twl6030_gpadc_enable_irq(u8 mask) |
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{ |
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int ret; |
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ret = twl6030_interrupt_unmask(mask, REG_INT_MSK_LINE_B); |
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if (ret < 0) |
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return ret; |
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ret = twl6030_interrupt_unmask(mask, REG_INT_MSK_STS_B); |
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return ret; |
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} |
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static void twl6030_gpadc_disable_irq(u8 mask) |
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{ |
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twl6030_interrupt_mask(mask, REG_INT_MSK_LINE_B); |
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twl6030_interrupt_mask(mask, REG_INT_MSK_STS_B); |
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} |
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static irqreturn_t twl6030_gpadc_irq_handler(int irq, void *indio_dev) |
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{ |
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struct twl6030_gpadc_data *gpadc = iio_priv(indio_dev); |
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complete(&gpadc->irq_complete); |
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return IRQ_HANDLED; |
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} |
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static int twl6030_start_conversion(int channel) |
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{ |
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return twl6030_gpadc_write(TWL6030_GPADC_CTRL_P1, |
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TWL6030_GPADC_CTRL_P1_SP1); |
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} |
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static int twl6032_start_conversion(int channel) |
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{ |
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int ret; |
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ret = twl6030_gpadc_write(TWL6032_GPADC_GPSELECT_ISB, channel); |
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if (ret) |
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return ret; |
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return twl6030_gpadc_write(TWL6032_GPADC_CTRL_P1, |
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TWL6030_GPADC_CTRL_P1_SP1); |
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} |
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static u8 twl6030_channel_to_reg(int channel) |
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{ |
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return TWL6030_GPADC_GPCH0_LSB + 2 * channel; |
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} |
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static u8 twl6032_channel_to_reg(int channel) |
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{ |
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/* |
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* for any prior chosen channel, when the conversion is ready |
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* the result is avalable in GPCH0_LSB, GPCH0_MSB. |
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*/ |
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return TWL6032_GPADC_GPCH0_LSB; |
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} |
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static int twl6030_gpadc_lookup(const struct twl6030_ideal_code *ideal, |
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int channel, int size) |
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{ |
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int i; |
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for (i = 0; i < size; i++) |
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if (ideal[i].channel == channel) |
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break; |
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return i; |
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} |
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static int twl6030_channel_calibrated(const struct twl6030_gpadc_platform_data |
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*pdata, int channel) |
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{ |
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const struct twl6030_ideal_code *ideal = pdata->ideal; |
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int i; |
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i = twl6030_gpadc_lookup(ideal, channel, pdata->nchannels); |
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/* not calibrated channels have 0 in all structure members */ |
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return pdata->ideal[i].code2; |
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} |
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static int twl6030_gpadc_make_correction(struct twl6030_gpadc_data *gpadc, |
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int channel, int raw_code) |
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{ |
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const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal; |
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int corrected_code; |
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int i; |
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i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels); |
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corrected_code = ((raw_code * 1000) - |
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gpadc->twl6030_cal_tbl[i].offset_error) / |
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gpadc->twl6030_cal_tbl[i].gain_error; |
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return corrected_code; |
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} |
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static int twl6030_gpadc_get_raw(struct twl6030_gpadc_data *gpadc, |
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int channel, int *res) |
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{ |
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u8 reg = gpadc->pdata->channel_to_reg(channel); |
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__le16 val; |
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int raw_code; |
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int ret; |
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ret = twl6030_gpadc_read(reg, (u8 *)&val); |
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if (ret) { |
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dev_dbg(gpadc->dev, "unable to read register 0x%X\n", reg); |
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return ret; |
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} |
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raw_code = le16_to_cpu(val); |
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dev_dbg(gpadc->dev, "GPADC raw code: %d", raw_code); |
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if (twl6030_channel_calibrated(gpadc->pdata, channel)) |
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*res = twl6030_gpadc_make_correction(gpadc, channel, raw_code); |
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else |
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*res = raw_code; |
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return ret; |
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} |
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static int twl6030_gpadc_get_processed(struct twl6030_gpadc_data *gpadc, |
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int channel, int *val) |
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{ |
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const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal; |
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int corrected_code; |
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int channel_value; |
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int i; |
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int ret; |
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ret = twl6030_gpadc_get_raw(gpadc, channel, &corrected_code); |
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if (ret) |
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return ret; |
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i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels); |
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channel_value = corrected_code * |
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gpadc->twl6030_cal_tbl[i].gain; |
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/* Shift back into mV range */ |
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channel_value /= 1000; |
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dev_dbg(gpadc->dev, "GPADC corrected code: %d", corrected_code); |
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dev_dbg(gpadc->dev, "GPADC value: %d", channel_value); |
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*val = channel_value; |
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return ret; |
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} |
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static int twl6030_gpadc_read_raw(struct iio_dev *indio_dev, |
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const struct iio_chan_spec *chan, |
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int *val, int *val2, long mask) |
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{ |
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struct twl6030_gpadc_data *gpadc = iio_priv(indio_dev); |
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int ret; |
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long timeout; |
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mutex_lock(&gpadc->lock); |
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ret = gpadc->pdata->start_conversion(chan->channel); |
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if (ret) { |
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dev_err(gpadc->dev, "failed to start conversion\n"); |
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goto err; |
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} |
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/* wait for conversion to complete */ |
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timeout = wait_for_completion_interruptible_timeout( |
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&gpadc->irq_complete, msecs_to_jiffies(5000)); |
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if (timeout == 0) { |
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ret = -ETIMEDOUT; |
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goto err; |
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} else if (timeout < 0) { |
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ret = -EINTR; |
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goto err; |
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} |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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ret = twl6030_gpadc_get_raw(gpadc, chan->channel, val); |
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ret = ret ? -EIO : IIO_VAL_INT; |
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break; |
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case IIO_CHAN_INFO_PROCESSED: |
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ret = twl6030_gpadc_get_processed(gpadc, chan->channel, val); |
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ret = ret ? -EIO : IIO_VAL_INT; |
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break; |
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default: |
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break; |
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} |
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err: |
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mutex_unlock(&gpadc->lock); |
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return ret; |
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} |
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|
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/* |
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* The GPADC channels are calibrated using a two point calibration method. |
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* The channels measured with two known values: volt1 and volt2, and |
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* ideal corresponding output codes are known: code1, code2. |
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* The difference(d1, d2) between ideal and measured codes stored in trim |
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* registers. |
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* The goal is to find offset and gain of the real curve for each calibrated |
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* channel. |
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* gain: k = 1 + ((d2 - d1) / (x2 - x1)) |
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* offset: b = d1 + (k - 1) * x1 |
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*/ |
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static void twl6030_calibrate_channel(struct twl6030_gpadc_data *gpadc, |
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int channel, int d1, int d2) |
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{ |
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int b, k, gain, x1, x2, i; |
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const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal; |
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i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels); |
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|
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/* Gain */ |
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gain = ((ideal[i].volt2 - ideal[i].volt1) * 1000) / |
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(ideal[i].code2 - ideal[i].code1); |
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x1 = ideal[i].code1; |
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x2 = ideal[i].code2; |
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|
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/* k - real curve gain */ |
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k = 1000 + (((d2 - d1) * 1000) / (x2 - x1)); |
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|
|
/* b - offset of the real curve gain */ |
|
b = (d1 * 1000) - (k - 1000) * x1; |
|
|
|
gpadc->twl6030_cal_tbl[i].gain = gain; |
|
gpadc->twl6030_cal_tbl[i].gain_error = k; |
|
gpadc->twl6030_cal_tbl[i].offset_error = b; |
|
|
|
dev_dbg(gpadc->dev, "GPADC d1 for Chn: %d = %d\n", channel, d1); |
|
dev_dbg(gpadc->dev, "GPADC d2 for Chn: %d = %d\n", channel, d2); |
|
dev_dbg(gpadc->dev, "GPADC x1 for Chn: %d = %d\n", channel, x1); |
|
dev_dbg(gpadc->dev, "GPADC x2 for Chn: %d = %d\n", channel, x2); |
|
dev_dbg(gpadc->dev, "GPADC Gain for Chn: %d = %d\n", channel, gain); |
|
dev_dbg(gpadc->dev, "GPADC k for Chn: %d = %d\n", channel, k); |
|
dev_dbg(gpadc->dev, "GPADC b for Chn: %d = %d\n", channel, b); |
|
} |
|
|
|
static inline int twl6030_gpadc_get_trim_offset(s8 d) |
|
{ |
|
/* |
|
* XXX NOTE! |
|
* bit 0 - sign, bit 7 - reserved, 6..1 - trim value |
|
* though, the documentation states that trim value |
|
* is absolute value, the correct conversion results are |
|
* obtained if the value is interpreted as 2's complement. |
|
*/ |
|
__u32 temp = ((d & 0x7f) >> 1) | ((d & 1) << 6); |
|
|
|
return sign_extend32(temp, 6); |
|
} |
|
|
|
static int twl6030_calibration(struct twl6030_gpadc_data *gpadc) |
|
{ |
|
int ret; |
|
int chn; |
|
u8 trim_regs[TWL6030_GPADC_NUM_TRIM_REGS]; |
|
s8 d1, d2; |
|
|
|
/* |
|
* for calibration two measurements have been performed at |
|
* factory, for some channels, during the production test and |
|
* have been stored in registers. This two stored values are |
|
* used to correct the measurements. The values represent |
|
* offsets for the given input from the output on ideal curve. |
|
*/ |
|
ret = twl_i2c_read(TWL6030_MODULE_ID2, trim_regs, |
|
TWL6030_GPADC_TRIM1, TWL6030_GPADC_NUM_TRIM_REGS); |
|
if (ret < 0) { |
|
dev_err(gpadc->dev, "calibration failed\n"); |
|
return ret; |
|
} |
|
|
|
for (chn = 0; chn < TWL6030_GPADC_MAX_CHANNELS; chn++) { |
|
|
|
switch (chn) { |
|
case 0: |
|
d1 = trim_regs[0]; |
|
d2 = trim_regs[1]; |
|
break; |
|
case 1: |
|
case 3: |
|
case 4: |
|
case 5: |
|
case 6: |
|
d1 = trim_regs[4]; |
|
d2 = trim_regs[5]; |
|
break; |
|
case 2: |
|
d1 = trim_regs[12]; |
|
d2 = trim_regs[13]; |
|
break; |
|
case 7: |
|
d1 = trim_regs[6]; |
|
d2 = trim_regs[7]; |
|
break; |
|
case 8: |
|
d1 = trim_regs[2]; |
|
d2 = trim_regs[3]; |
|
break; |
|
case 9: |
|
d1 = trim_regs[8]; |
|
d2 = trim_regs[9]; |
|
break; |
|
case 10: |
|
d1 = trim_regs[10]; |
|
d2 = trim_regs[11]; |
|
break; |
|
case 14: |
|
d1 = trim_regs[14]; |
|
d2 = trim_regs[15]; |
|
break; |
|
default: |
|
continue; |
|
} |
|
|
|
d1 = twl6030_gpadc_get_trim_offset(d1); |
|
d2 = twl6030_gpadc_get_trim_offset(d2); |
|
|
|
twl6030_calibrate_channel(gpadc, chn, d1, d2); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int twl6032_get_trim_value(u8 *trim_regs, unsigned int reg0, |
|
unsigned int reg1, unsigned int mask0, unsigned int mask1, |
|
unsigned int shift0) |
|
{ |
|
int val; |
|
|
|
val = (trim_regs[reg0] & mask0) << shift0; |
|
val |= (trim_regs[reg1] & mask1) >> 1; |
|
if (trim_regs[reg1] & 0x01) |
|
val = -val; |
|
|
|
return val; |
|
} |
|
|
|
static int twl6032_calibration(struct twl6030_gpadc_data *gpadc) |
|
{ |
|
int chn, d1 = 0, d2 = 0, temp; |
|
u8 trim_regs[TWL6030_GPADC_NUM_TRIM_REGS]; |
|
int ret; |
|
|
|
ret = twl_i2c_read(TWL6030_MODULE_ID2, trim_regs, |
|
TWL6030_GPADC_TRIM1, TWL6030_GPADC_NUM_TRIM_REGS); |
|
if (ret < 0) { |
|
dev_err(gpadc->dev, "calibration failed\n"); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Loop to calculate the value needed for returning voltages from |
|
* GPADC not values. |
|
* |
|
* gain is calculated to 3 decimal places fixed point. |
|
*/ |
|
for (chn = 0; chn < TWL6032_GPADC_MAX_CHANNELS; chn++) { |
|
|
|
switch (chn) { |
|
case 0: |
|
case 1: |
|
case 2: |
|
case 3: |
|
case 4: |
|
case 5: |
|
case 6: |
|
case 11: |
|
case 14: |
|
d1 = twl6032_get_trim_value(trim_regs, 2, 0, 0x1f, |
|
0x06, 2); |
|
d2 = twl6032_get_trim_value(trim_regs, 3, 1, 0x3f, |
|
0x06, 2); |
|
break; |
|
case 8: |
|
temp = twl6032_get_trim_value(trim_regs, 2, 0, 0x1f, |
|
0x06, 2); |
|
d1 = temp + twl6032_get_trim_value(trim_regs, 7, 6, |
|
0x18, 0x1E, 1); |
|
|
|
temp = twl6032_get_trim_value(trim_regs, 3, 1, 0x3F, |
|
0x06, 2); |
|
d2 = temp + twl6032_get_trim_value(trim_regs, 9, 7, |
|
0x1F, 0x06, 2); |
|
break; |
|
case 9: |
|
temp = twl6032_get_trim_value(trim_regs, 2, 0, 0x1f, |
|
0x06, 2); |
|
d1 = temp + twl6032_get_trim_value(trim_regs, 13, 11, |
|
0x18, 0x1E, 1); |
|
|
|
temp = twl6032_get_trim_value(trim_regs, 3, 1, 0x3f, |
|
0x06, 2); |
|
d2 = temp + twl6032_get_trim_value(trim_regs, 15, 13, |
|
0x1F, 0x06, 1); |
|
break; |
|
case 10: |
|
d1 = twl6032_get_trim_value(trim_regs, 10, 8, 0x0f, |
|
0x0E, 3); |
|
d2 = twl6032_get_trim_value(trim_regs, 14, 12, 0x0f, |
|
0x0E, 3); |
|
break; |
|
case 7: |
|
case 18: |
|
temp = twl6032_get_trim_value(trim_regs, 2, 0, 0x1f, |
|
0x06, 2); |
|
|
|
d1 = (trim_regs[4] & 0x7E) >> 1; |
|
if (trim_regs[4] & 0x01) |
|
d1 = -d1; |
|
d1 += temp; |
|
|
|
temp = twl6032_get_trim_value(trim_regs, 3, 1, 0x3f, |
|
0x06, 2); |
|
|
|
d2 = (trim_regs[5] & 0xFE) >> 1; |
|
if (trim_regs[5] & 0x01) |
|
d2 = -d2; |
|
|
|
d2 += temp; |
|
break; |
|
default: |
|
/* No data for other channels */ |
|
continue; |
|
} |
|
|
|
twl6030_calibrate_channel(gpadc, chn, d1, d2); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
#define TWL6030_GPADC_CHAN(chn, _type, chan_info) { \ |
|
.type = _type, \ |
|
.channel = chn, \ |
|
.info_mask_separate = BIT(chan_info), \ |
|
.indexed = 1, \ |
|
} |
|
|
|
static const struct iio_chan_spec twl6030_gpadc_iio_channels[] = { |
|
TWL6030_GPADC_CHAN(0, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(1, IIO_TEMP, IIO_CHAN_INFO_RAW), |
|
TWL6030_GPADC_CHAN(2, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(3, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(4, IIO_TEMP, IIO_CHAN_INFO_RAW), |
|
TWL6030_GPADC_CHAN(5, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(6, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(7, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(8, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(9, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(10, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(11, IIO_VOLTAGE, IIO_CHAN_INFO_RAW), |
|
TWL6030_GPADC_CHAN(14, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
}; |
|
|
|
static const struct iio_chan_spec twl6032_gpadc_iio_channels[] = { |
|
TWL6030_GPADC_CHAN(0, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(1, IIO_TEMP, IIO_CHAN_INFO_RAW), |
|
TWL6030_GPADC_CHAN(2, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(3, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(4, IIO_TEMP, IIO_CHAN_INFO_RAW), |
|
TWL6030_GPADC_CHAN(5, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(6, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(7, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(8, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(9, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(10, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(11, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(14, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
TWL6030_GPADC_CHAN(17, IIO_VOLTAGE, IIO_CHAN_INFO_RAW), |
|
TWL6030_GPADC_CHAN(18, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), |
|
}; |
|
|
|
static const struct iio_info twl6030_gpadc_iio_info = { |
|
.read_raw = &twl6030_gpadc_read_raw, |
|
}; |
|
|
|
static const struct twl6030_gpadc_platform_data twl6030_pdata = { |
|
.iio_channels = twl6030_gpadc_iio_channels, |
|
.nchannels = TWL6030_GPADC_USED_CHANNELS, |
|
.ideal = twl6030_ideal, |
|
.start_conversion = twl6030_start_conversion, |
|
.channel_to_reg = twl6030_channel_to_reg, |
|
.calibrate = twl6030_calibration, |
|
}; |
|
|
|
static const struct twl6030_gpadc_platform_data twl6032_pdata = { |
|
.iio_channels = twl6032_gpadc_iio_channels, |
|
.nchannels = TWL6032_GPADC_USED_CHANNELS, |
|
.ideal = twl6032_ideal, |
|
.start_conversion = twl6032_start_conversion, |
|
.channel_to_reg = twl6032_channel_to_reg, |
|
.calibrate = twl6032_calibration, |
|
}; |
|
|
|
static const struct of_device_id of_twl6030_match_tbl[] = { |
|
{ |
|
.compatible = "ti,twl6030-gpadc", |
|
.data = &twl6030_pdata, |
|
}, |
|
{ |
|
.compatible = "ti,twl6032-gpadc", |
|
.data = &twl6032_pdata, |
|
}, |
|
{ /* end */ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, of_twl6030_match_tbl); |
|
|
|
static int twl6030_gpadc_probe(struct platform_device *pdev) |
|
{ |
|
struct device *dev = &pdev->dev; |
|
struct twl6030_gpadc_data *gpadc; |
|
const struct twl6030_gpadc_platform_data *pdata; |
|
const struct of_device_id *match; |
|
struct iio_dev *indio_dev; |
|
int irq; |
|
int ret; |
|
|
|
match = of_match_device(of_twl6030_match_tbl, dev); |
|
if (!match) |
|
return -EINVAL; |
|
|
|
pdata = match->data; |
|
|
|
indio_dev = devm_iio_device_alloc(dev, sizeof(*gpadc)); |
|
if (!indio_dev) |
|
return -ENOMEM; |
|
|
|
gpadc = iio_priv(indio_dev); |
|
|
|
gpadc->twl6030_cal_tbl = devm_kcalloc(dev, |
|
pdata->nchannels, |
|
sizeof(*gpadc->twl6030_cal_tbl), |
|
GFP_KERNEL); |
|
if (!gpadc->twl6030_cal_tbl) |
|
return -ENOMEM; |
|
|
|
gpadc->dev = dev; |
|
gpadc->pdata = pdata; |
|
|
|
platform_set_drvdata(pdev, indio_dev); |
|
mutex_init(&gpadc->lock); |
|
init_completion(&gpadc->irq_complete); |
|
|
|
ret = pdata->calibrate(gpadc); |
|
if (ret < 0) { |
|
dev_err(&pdev->dev, "failed to read calibration registers\n"); |
|
return ret; |
|
} |
|
|
|
irq = platform_get_irq(pdev, 0); |
|
if (irq < 0) |
|
return irq; |
|
|
|
ret = devm_request_threaded_irq(dev, irq, NULL, |
|
twl6030_gpadc_irq_handler, |
|
IRQF_ONESHOT, "twl6030_gpadc", indio_dev); |
|
|
|
ret = twl6030_gpadc_enable_irq(TWL6030_GPADC_RT_SW1_EOC_MASK); |
|
if (ret < 0) { |
|
dev_err(&pdev->dev, "failed to enable GPADC interrupt\n"); |
|
return ret; |
|
} |
|
|
|
ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, TWL6030_GPADCS, |
|
TWL6030_REG_TOGGLE1); |
|
if (ret < 0) { |
|
dev_err(&pdev->dev, "failed to enable GPADC module\n"); |
|
return ret; |
|
} |
|
|
|
indio_dev->name = DRIVER_NAME; |
|
indio_dev->info = &twl6030_gpadc_iio_info; |
|
indio_dev->modes = INDIO_DIRECT_MODE; |
|
indio_dev->channels = pdata->iio_channels; |
|
indio_dev->num_channels = pdata->nchannels; |
|
|
|
return iio_device_register(indio_dev); |
|
} |
|
|
|
static int twl6030_gpadc_remove(struct platform_device *pdev) |
|
{ |
|
struct iio_dev *indio_dev = platform_get_drvdata(pdev); |
|
|
|
twl6030_gpadc_disable_irq(TWL6030_GPADC_RT_SW1_EOC_MASK); |
|
iio_device_unregister(indio_dev); |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
static int twl6030_gpadc_suspend(struct device *pdev) |
|
{ |
|
int ret; |
|
|
|
ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, TWL6030_GPADCR, |
|
TWL6030_REG_TOGGLE1); |
|
if (ret) |
|
dev_err(pdev, "error resetting GPADC (%d)!\n", ret); |
|
|
|
return 0; |
|
}; |
|
|
|
static int twl6030_gpadc_resume(struct device *pdev) |
|
{ |
|
int ret; |
|
|
|
ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, TWL6030_GPADCS, |
|
TWL6030_REG_TOGGLE1); |
|
if (ret) |
|
dev_err(pdev, "error setting GPADC (%d)!\n", ret); |
|
|
|
return 0; |
|
}; |
|
#endif |
|
|
|
static SIMPLE_DEV_PM_OPS(twl6030_gpadc_pm_ops, twl6030_gpadc_suspend, |
|
twl6030_gpadc_resume); |
|
|
|
static struct platform_driver twl6030_gpadc_driver = { |
|
.probe = twl6030_gpadc_probe, |
|
.remove = twl6030_gpadc_remove, |
|
.driver = { |
|
.name = DRIVER_NAME, |
|
.pm = &twl6030_gpadc_pm_ops, |
|
.of_match_table = of_twl6030_match_tbl, |
|
}, |
|
}; |
|
|
|
module_platform_driver(twl6030_gpadc_driver); |
|
|
|
MODULE_ALIAS("platform:" DRIVER_NAME); |
|
MODULE_AUTHOR("Balaji T K <[email protected]>"); |
|
MODULE_AUTHOR("Graeme Gregory <[email protected]>"); |
|
MODULE_AUTHOR("Oleksandr Kozaruk <[email protected]"); |
|
MODULE_DESCRIPTION("twl6030 ADC driver"); |
|
MODULE_LICENSE("GPL");
|
|
|