From 03dd4cb26d967f9588437b0fc9cc0e8353322bb7 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Fri, 25 Mar 2016 03:53:42 -0300 Subject: Linux-libre 4.5-gnu --- drivers/iio/adc/palmas_gpadc.c | 859 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 859 insertions(+) create mode 100644 drivers/iio/adc/palmas_gpadc.c (limited to 'drivers/iio/adc/palmas_gpadc.c') diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c new file mode 100644 index 000000000..f42eb8a7d --- /dev/null +++ b/drivers/iio/adc/palmas_gpadc.c @@ -0,0 +1,859 @@ +/* + * palmas-adc.c -- TI PALMAS GPADC. + * + * Copyright (c) 2013, NVIDIA Corporation. All rights reserved. + * + * Author: Pradeep Goudagunta + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MOD_NAME "palmas-gpadc" +#define PALMAS_ADC_CONVERSION_TIMEOUT (msecs_to_jiffies(5000)) +#define PALMAS_TO_BE_CALCULATED 0 +#define PALMAS_GPADC_TRIMINVALID -1 + +struct palmas_gpadc_info { +/* calibration codes and regs */ + int x1; /* lower ideal code */ + int x2; /* higher ideal code */ + int v1; /* expected lower volt reading */ + int v2; /* expected higher volt reading */ + u8 trim1_reg; /* register number for lower trim */ + u8 trim2_reg; /* register number for upper trim */ + int gain; /* calculated from above (after reading trim regs) */ + int offset; /* calculated from above (after reading trim regs) */ + int gain_error; /* calculated from above (after reading trim regs) */ + bool is_uncalibrated; /* if channel has calibration data */ +}; + +#define PALMAS_ADC_INFO(_chan, _x1, _x2, _v1, _v2, _t1, _t2, _is_uncalibrated) \ + [PALMAS_ADC_CH_##_chan] = { \ + .x1 = _x1, \ + .x2 = _x2, \ + .v1 = _v1, \ + .v2 = _v2, \ + .gain = PALMAS_TO_BE_CALCULATED, \ + .offset = PALMAS_TO_BE_CALCULATED, \ + .gain_error = PALMAS_TO_BE_CALCULATED, \ + .trim1_reg = PALMAS_GPADC_TRIM##_t1, \ + .trim2_reg = PALMAS_GPADC_TRIM##_t2, \ + .is_uncalibrated = _is_uncalibrated \ + } + +static struct palmas_gpadc_info palmas_gpadc_info[] = { + PALMAS_ADC_INFO(IN0, 2064, 3112, 630, 950, 1, 2, false), + PALMAS_ADC_INFO(IN1, 2064, 3112, 630, 950, 1, 2, false), + PALMAS_ADC_INFO(IN2, 2064, 3112, 1260, 1900, 3, 4, false), + PALMAS_ADC_INFO(IN3, 2064, 3112, 630, 950, 1, 2, false), + PALMAS_ADC_INFO(IN4, 2064, 3112, 630, 950, 1, 2, false), + PALMAS_ADC_INFO(IN5, 2064, 3112, 630, 950, 1, 2, false), + PALMAS_ADC_INFO(IN6, 2064, 3112, 2520, 3800, 5, 6, false), + PALMAS_ADC_INFO(IN7, 2064, 3112, 2520, 3800, 7, 8, false), + PALMAS_ADC_INFO(IN8, 2064, 3112, 3150, 4750, 9, 10, false), + PALMAS_ADC_INFO(IN9, 2064, 3112, 5670, 8550, 11, 12, false), + PALMAS_ADC_INFO(IN10, 2064, 3112, 3465, 5225, 13, 14, false), + PALMAS_ADC_INFO(IN11, 0, 0, 0, 0, INVALID, INVALID, true), + PALMAS_ADC_INFO(IN12, 0, 0, 0, 0, INVALID, INVALID, true), + PALMAS_ADC_INFO(IN13, 0, 0, 0, 0, INVALID, INVALID, true), + PALMAS_ADC_INFO(IN14, 2064, 3112, 3645, 5225, 15, 16, false), + PALMAS_ADC_INFO(IN15, 0, 0, 0, 0, INVALID, INVALID, true), +}; + +/** + * struct palmas_gpadc - the palmas_gpadc structure + * @ch0_current: channel 0 current source setting + * 0: 0 uA + * 1: 5 uA + * 2: 15 uA + * 3: 20 uA + * @ch3_current: channel 0 current source setting + * 0: 0 uA + * 1: 10 uA + * 2: 400 uA + * 3: 800 uA + * @extended_delay: enable the gpadc extended delay mode + * @auto_conversion_period: define the auto_conversion_period + * + * This is the palmas_gpadc structure to store run-time information + * and pointers for this driver instance. + */ + +struct palmas_gpadc { + struct device *dev; + struct palmas *palmas; + u8 ch0_current; + u8 ch3_current; + bool extended_delay; + int irq; + int irq_auto_0; + int irq_auto_1; + struct palmas_gpadc_info *adc_info; + struct completion conv_completion; + struct palmas_adc_wakeup_property wakeup1_data; + struct palmas_adc_wakeup_property wakeup2_data; + bool wakeup1_enable; + bool wakeup2_enable; + int auto_conversion_period; +}; + +/* + * GPADC lock issue in AUTO mode. + * Impact: In AUTO mode, GPADC conversion can be locked after disabling AUTO + * mode feature. + * Details: + * When the AUTO mode is the only conversion mode enabled, if the AUTO + * mode feature is disabled with bit GPADC_AUTO_CTRL. AUTO_CONV1_EN = 0 + * or bit GPADC_AUTO_CTRL. AUTO_CONV0_EN = 0 during a conversion, the + * conversion mechanism can be seen as locked meaning that all following + * conversion will give 0 as a result. Bit GPADC_STATUS.GPADC_AVAILABLE + * will stay at 0 meaning that GPADC is busy. An RT conversion can unlock + * the GPADC. + * + * Workaround(s): + * To avoid the lock mechanism, the workaround to follow before any stop + * conversion request is: + * Force the GPADC state machine to be ON by using the GPADC_CTRL1. + * GPADC_FORCE bit = 1 + * Shutdown the GPADC AUTO conversion using + * GPADC_AUTO_CTRL.SHUTDOWN_CONV[01] = 0. + * After 100us, force the GPADC state machine to be OFF by using the + * GPADC_CTRL1. GPADC_FORCE bit = 0 + */ + +static int palmas_disable_auto_conversion(struct palmas_gpadc *adc) +{ + int ret; + + ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_CTRL1, + PALMAS_GPADC_CTRL1_GPADC_FORCE, + PALMAS_GPADC_CTRL1_GPADC_FORCE); + if (ret < 0) { + dev_err(adc->dev, "GPADC_CTRL1 update failed: %d\n", ret); + return ret; + } + + ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_AUTO_CTRL, + PALMAS_GPADC_AUTO_CTRL_SHUTDOWN_CONV1 | + PALMAS_GPADC_AUTO_CTRL_SHUTDOWN_CONV0, + 0); + if (ret < 0) { + dev_err(adc->dev, "AUTO_CTRL update failed: %d\n", ret); + return ret; + } + + udelay(100); + + ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_CTRL1, + PALMAS_GPADC_CTRL1_GPADC_FORCE, 0); + if (ret < 0) + dev_err(adc->dev, "GPADC_CTRL1 update failed: %d\n", ret); + + return ret; +} + +static irqreturn_t palmas_gpadc_irq(int irq, void *data) +{ + struct palmas_gpadc *adc = data; + + complete(&adc->conv_completion); + + return IRQ_HANDLED; +} + +static irqreturn_t palmas_gpadc_irq_auto(int irq, void *data) +{ + struct palmas_gpadc *adc = data; + + dev_dbg(adc->dev, "Threshold interrupt %d occurs\n", irq); + palmas_disable_auto_conversion(adc); + + return IRQ_HANDLED; +} + +static int palmas_gpadc_start_mask_interrupt(struct palmas_gpadc *adc, + bool mask) +{ + int ret; + + if (!mask) + ret = palmas_update_bits(adc->palmas, PALMAS_INTERRUPT_BASE, + PALMAS_INT3_MASK, + PALMAS_INT3_MASK_GPADC_EOC_SW, 0); + else + ret = palmas_update_bits(adc->palmas, PALMAS_INTERRUPT_BASE, + PALMAS_INT3_MASK, + PALMAS_INT3_MASK_GPADC_EOC_SW, + PALMAS_INT3_MASK_GPADC_EOC_SW); + if (ret < 0) + dev_err(adc->dev, "GPADC INT MASK update failed: %d\n", ret); + + return ret; +} + +static int palmas_gpadc_enable(struct palmas_gpadc *adc, int adc_chan, + int enable) +{ + unsigned int mask, val; + int ret; + + if (enable) { + val = (adc->extended_delay + << PALMAS_GPADC_RT_CTRL_EXTEND_DELAY_SHIFT); + ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_RT_CTRL, + PALMAS_GPADC_RT_CTRL_EXTEND_DELAY, val); + if (ret < 0) { + dev_err(adc->dev, "RT_CTRL update failed: %d\n", ret); + return ret; + } + + mask = (PALMAS_GPADC_CTRL1_CURRENT_SRC_CH0_MASK | + PALMAS_GPADC_CTRL1_CURRENT_SRC_CH3_MASK | + PALMAS_GPADC_CTRL1_GPADC_FORCE); + val = (adc->ch0_current + << PALMAS_GPADC_CTRL1_CURRENT_SRC_CH0_SHIFT); + val |= (adc->ch3_current + << PALMAS_GPADC_CTRL1_CURRENT_SRC_CH3_SHIFT); + val |= PALMAS_GPADC_CTRL1_GPADC_FORCE; + ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_CTRL1, mask, val); + if (ret < 0) { + dev_err(adc->dev, + "Failed to update current setting: %d\n", ret); + return ret; + } + + mask = (PALMAS_GPADC_SW_SELECT_SW_CONV0_SEL_MASK | + PALMAS_GPADC_SW_SELECT_SW_CONV_EN); + val = (adc_chan | PALMAS_GPADC_SW_SELECT_SW_CONV_EN); + ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_SW_SELECT, mask, val); + if (ret < 0) { + dev_err(adc->dev, "SW_SELECT update failed: %d\n", ret); + return ret; + } + } else { + ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_SW_SELECT, 0); + if (ret < 0) + dev_err(adc->dev, "SW_SELECT write failed: %d\n", ret); + + ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_CTRL1, + PALMAS_GPADC_CTRL1_GPADC_FORCE, 0); + if (ret < 0) { + dev_err(adc->dev, "CTRL1 update failed: %d\n", ret); + return ret; + } + } + + return ret; +} + +static int palmas_gpadc_read_prepare(struct palmas_gpadc *adc, int adc_chan) +{ + int ret; + + ret = palmas_gpadc_enable(adc, adc_chan, true); + if (ret < 0) + return ret; + + return palmas_gpadc_start_mask_interrupt(adc, 0); +} + +static void palmas_gpadc_read_done(struct palmas_gpadc *adc, int adc_chan) +{ + palmas_gpadc_start_mask_interrupt(adc, 1); + palmas_gpadc_enable(adc, adc_chan, false); +} + +static int palmas_gpadc_calibrate(struct palmas_gpadc *adc, int adc_chan) +{ + int k; + int d1; + int d2; + int ret; + int gain; + int x1 = adc->adc_info[adc_chan].x1; + int x2 = adc->adc_info[adc_chan].x2; + int v1 = adc->adc_info[adc_chan].v1; + int v2 = adc->adc_info[adc_chan].v2; + + ret = palmas_read(adc->palmas, PALMAS_TRIM_GPADC_BASE, + adc->adc_info[adc_chan].trim1_reg, &d1); + if (ret < 0) { + dev_err(adc->dev, "TRIM read failed: %d\n", ret); + goto scrub; + } + + ret = palmas_read(adc->palmas, PALMAS_TRIM_GPADC_BASE, + adc->adc_info[adc_chan].trim2_reg, &d2); + if (ret < 0) { + dev_err(adc->dev, "TRIM read failed: %d\n", ret); + goto scrub; + } + + /* gain error calculation */ + k = (1000 + (1000 * (d2 - d1)) / (x2 - x1)); + + /* gain calculation */ + gain = ((v2 - v1) * 1000) / (x2 - x1); + + adc->adc_info[adc_chan].gain_error = k; + adc->adc_info[adc_chan].gain = gain; + /* offset Calculation */ + adc->adc_info[adc_chan].offset = (d1 * 1000) - ((k - 1000) * x1); + +scrub: + return ret; +} + +static int palmas_gpadc_start_conversion(struct palmas_gpadc *adc, int adc_chan) +{ + unsigned int val; + int ret; + + init_completion(&adc->conv_completion); + ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_SW_SELECT, + PALMAS_GPADC_SW_SELECT_SW_START_CONV0, + PALMAS_GPADC_SW_SELECT_SW_START_CONV0); + if (ret < 0) { + dev_err(adc->dev, "SELECT_SW_START write failed: %d\n", ret); + return ret; + } + + ret = wait_for_completion_timeout(&adc->conv_completion, + PALMAS_ADC_CONVERSION_TIMEOUT); + if (ret == 0) { + dev_err(adc->dev, "conversion not completed\n"); + return -ETIMEDOUT; + } + + ret = palmas_bulk_read(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_SW_CONV0_LSB, &val, 2); + if (ret < 0) { + dev_err(adc->dev, "SW_CONV0_LSB read failed: %d\n", ret); + return ret; + } + + ret = val & 0xFFF; + + return ret; +} + +static int palmas_gpadc_get_calibrated_code(struct palmas_gpadc *adc, + int adc_chan, int val) +{ + if (!adc->adc_info[adc_chan].is_uncalibrated) + val = (val*1000 - adc->adc_info[adc_chan].offset) / + adc->adc_info[adc_chan].gain_error; + + if (val < 0) { + dev_err(adc->dev, "Mismatch with calibration\n"); + return 0; + } + + val = (val * adc->adc_info[adc_chan].gain) / 1000; + + return val; +} + +static int palmas_gpadc_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, int *val2, long mask) +{ + struct palmas_gpadc *adc = iio_priv(indio_dev); + int adc_chan = chan->channel; + int ret = 0; + + if (adc_chan > PALMAS_ADC_CH_MAX) + return -EINVAL; + + mutex_lock(&indio_dev->mlock); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + case IIO_CHAN_INFO_PROCESSED: + ret = palmas_gpadc_read_prepare(adc, adc_chan); + if (ret < 0) + goto out; + + ret = palmas_gpadc_start_conversion(adc, adc_chan); + if (ret < 0) { + dev_err(adc->dev, + "ADC start conversion failed\n"); + goto out; + } + + if (mask == IIO_CHAN_INFO_PROCESSED) + ret = palmas_gpadc_get_calibrated_code( + adc, adc_chan, ret); + + *val = ret; + + ret = IIO_VAL_INT; + goto out; + } + + mutex_unlock(&indio_dev->mlock); + return ret; + +out: + palmas_gpadc_read_done(adc, adc_chan); + mutex_unlock(&indio_dev->mlock); + + return ret; +} + +static const struct iio_info palmas_gpadc_iio_info = { + .read_raw = palmas_gpadc_read_raw, + .driver_module = THIS_MODULE, +}; + +#define PALMAS_ADC_CHAN_IIO(chan, _type, chan_info) \ +{ \ + .datasheet_name = PALMAS_DATASHEET_NAME(chan), \ + .type = _type, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(chan_info), \ + .indexed = 1, \ + .channel = PALMAS_ADC_CH_##chan, \ +} + +static const struct iio_chan_spec palmas_gpadc_iio_channel[] = { + PALMAS_ADC_CHAN_IIO(IN0, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), + PALMAS_ADC_CHAN_IIO(IN1, IIO_TEMP, IIO_CHAN_INFO_RAW), + PALMAS_ADC_CHAN_IIO(IN2, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), + PALMAS_ADC_CHAN_IIO(IN3, IIO_TEMP, IIO_CHAN_INFO_RAW), + PALMAS_ADC_CHAN_IIO(IN4, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), + PALMAS_ADC_CHAN_IIO(IN5, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), + PALMAS_ADC_CHAN_IIO(IN6, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), + PALMAS_ADC_CHAN_IIO(IN7, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), + PALMAS_ADC_CHAN_IIO(IN8, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), + PALMAS_ADC_CHAN_IIO(IN9, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), + PALMAS_ADC_CHAN_IIO(IN10, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), + PALMAS_ADC_CHAN_IIO(IN11, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), + PALMAS_ADC_CHAN_IIO(IN12, IIO_TEMP, IIO_CHAN_INFO_RAW), + PALMAS_ADC_CHAN_IIO(IN13, IIO_TEMP, IIO_CHAN_INFO_RAW), + PALMAS_ADC_CHAN_IIO(IN14, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), + PALMAS_ADC_CHAN_IIO(IN15, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED), +}; + +static int palmas_gpadc_get_adc_dt_data(struct platform_device *pdev, + struct palmas_gpadc_platform_data **gpadc_pdata) +{ + struct device_node *np = pdev->dev.of_node; + struct palmas_gpadc_platform_data *gp_data; + int ret; + u32 pval; + + gp_data = devm_kzalloc(&pdev->dev, sizeof(*gp_data), GFP_KERNEL); + if (!gp_data) + return -ENOMEM; + + ret = of_property_read_u32(np, "ti,channel0-current-microamp", &pval); + if (!ret) + gp_data->ch0_current = pval; + + ret = of_property_read_u32(np, "ti,channel3-current-microamp", &pval); + if (!ret) + gp_data->ch3_current = pval; + + gp_data->extended_delay = of_property_read_bool(np, + "ti,enable-extended-delay"); + + *gpadc_pdata = gp_data; + + return 0; +} + +static int palmas_gpadc_probe(struct platform_device *pdev) +{ + struct palmas_gpadc *adc; + struct palmas_platform_data *pdata; + struct palmas_gpadc_platform_data *gpadc_pdata = NULL; + struct iio_dev *indio_dev; + int ret, i; + + pdata = dev_get_platdata(pdev->dev.parent); + + if (pdata && pdata->gpadc_pdata) + gpadc_pdata = pdata->gpadc_pdata; + + if (!gpadc_pdata && pdev->dev.of_node) { + ret = palmas_gpadc_get_adc_dt_data(pdev, &gpadc_pdata); + if (ret < 0) + return ret; + } + if (!gpadc_pdata) + return -EINVAL; + + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc)); + if (!indio_dev) { + dev_err(&pdev->dev, "iio_device_alloc failed\n"); + return -ENOMEM; + } + + adc = iio_priv(indio_dev); + adc->dev = &pdev->dev; + adc->palmas = dev_get_drvdata(pdev->dev.parent); + adc->adc_info = palmas_gpadc_info; + init_completion(&adc->conv_completion); + dev_set_drvdata(&pdev->dev, indio_dev); + + adc->auto_conversion_period = gpadc_pdata->auto_conversion_period_ms; + adc->irq = palmas_irq_get_virq(adc->palmas, PALMAS_GPADC_EOC_SW_IRQ); + if (adc->irq < 0) { + dev_err(adc->dev, + "get virq failed: %d\n", adc->irq); + ret = adc->irq; + goto out; + } + ret = request_threaded_irq(adc->irq, NULL, + palmas_gpadc_irq, + IRQF_ONESHOT | IRQF_EARLY_RESUME, dev_name(adc->dev), + adc); + if (ret < 0) { + dev_err(adc->dev, + "request irq %d failed: %d\n", adc->irq, ret); + goto out; + } + + if (gpadc_pdata->adc_wakeup1_data) { + memcpy(&adc->wakeup1_data, gpadc_pdata->adc_wakeup1_data, + sizeof(adc->wakeup1_data)); + adc->wakeup1_enable = true; + adc->irq_auto_0 = platform_get_irq(pdev, 1); + ret = request_threaded_irq(adc->irq_auto_0, NULL, + palmas_gpadc_irq_auto, + IRQF_ONESHOT | IRQF_EARLY_RESUME, + "palmas-adc-auto-0", adc); + if (ret < 0) { + dev_err(adc->dev, "request auto0 irq %d failed: %d\n", + adc->irq_auto_0, ret); + goto out_irq_free; + } + } + + if (gpadc_pdata->adc_wakeup2_data) { + memcpy(&adc->wakeup2_data, gpadc_pdata->adc_wakeup2_data, + sizeof(adc->wakeup2_data)); + adc->wakeup2_enable = true; + adc->irq_auto_1 = platform_get_irq(pdev, 2); + ret = request_threaded_irq(adc->irq_auto_1, NULL, + palmas_gpadc_irq_auto, + IRQF_ONESHOT | IRQF_EARLY_RESUME, + "palmas-adc-auto-1", adc); + if (ret < 0) { + dev_err(adc->dev, "request auto1 irq %d failed: %d\n", + adc->irq_auto_1, ret); + goto out_irq_auto0_free; + } + } + + /* set the current source 0 (value 0/5/15/20 uA => 0..3) */ + if (gpadc_pdata->ch0_current <= 1) + adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_0; + else if (gpadc_pdata->ch0_current <= 5) + adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_5; + else if (gpadc_pdata->ch0_current <= 15) + adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_15; + else + adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_20; + + /* set the current source 3 (value 0/10/400/800 uA => 0..3) */ + if (gpadc_pdata->ch3_current <= 1) + adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_0; + else if (gpadc_pdata->ch3_current <= 10) + adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_10; + else if (gpadc_pdata->ch3_current <= 400) + adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_400; + else + adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_800; + + adc->extended_delay = gpadc_pdata->extended_delay; + + indio_dev->name = MOD_NAME; + indio_dev->dev.parent = &pdev->dev; + indio_dev->info = &palmas_gpadc_iio_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = palmas_gpadc_iio_channel; + indio_dev->num_channels = ARRAY_SIZE(palmas_gpadc_iio_channel); + + ret = iio_device_register(indio_dev); + if (ret < 0) { + dev_err(adc->dev, "iio_device_register() failed: %d\n", ret); + goto out_irq_auto1_free; + } + + device_set_wakeup_capable(&pdev->dev, 1); + for (i = 0; i < PALMAS_ADC_CH_MAX; i++) { + if (!(adc->adc_info[i].is_uncalibrated)) + palmas_gpadc_calibrate(adc, i); + } + + if (adc->wakeup1_enable || adc->wakeup2_enable) + device_wakeup_enable(&pdev->dev); + + return 0; + +out_irq_auto1_free: + if (gpadc_pdata->adc_wakeup2_data) + free_irq(adc->irq_auto_1, adc); +out_irq_auto0_free: + if (gpadc_pdata->adc_wakeup1_data) + free_irq(adc->irq_auto_0, adc); +out_irq_free: + free_irq(adc->irq, adc); +out: + return ret; +} + +static int palmas_gpadc_remove(struct platform_device *pdev) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(&pdev->dev); + struct palmas_gpadc *adc = iio_priv(indio_dev); + + if (adc->wakeup1_enable || adc->wakeup2_enable) + device_wakeup_disable(&pdev->dev); + iio_device_unregister(indio_dev); + free_irq(adc->irq, adc); + if (adc->wakeup1_enable) + free_irq(adc->irq_auto_0, adc); + if (adc->wakeup2_enable) + free_irq(adc->irq_auto_1, adc); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int palmas_adc_wakeup_configure(struct palmas_gpadc *adc) +{ + int adc_period, conv; + int i; + int ch0 = 0, ch1 = 0; + int thres; + int ret; + + adc_period = adc->auto_conversion_period; + for (i = 0; i < 16; ++i) { + if (((1000 * (1 << i)) / 32) < adc_period) + continue; + } + if (i > 0) + i--; + adc_period = i; + ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_AUTO_CTRL, + PALMAS_GPADC_AUTO_CTRL_COUNTER_CONV_MASK, + adc_period); + if (ret < 0) { + dev_err(adc->dev, "AUTO_CTRL write failed: %d\n", ret); + return ret; + } + + conv = 0; + if (adc->wakeup1_enable) { + int polarity; + + ch0 = adc->wakeup1_data.adc_channel_number; + conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN; + if (adc->wakeup1_data.adc_high_threshold > 0) { + thres = adc->wakeup1_data.adc_high_threshold; + polarity = 0; + } else { + thres = adc->wakeup1_data.adc_low_threshold; + polarity = PALMAS_GPADC_THRES_CONV0_MSB_THRES_CONV0_POL; + } + + ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_THRES_CONV0_LSB, thres & 0xFF); + if (ret < 0) { + dev_err(adc->dev, + "THRES_CONV0_LSB write failed: %d\n", ret); + return ret; + } + + ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_THRES_CONV0_MSB, + ((thres >> 8) & 0xF) | polarity); + if (ret < 0) { + dev_err(adc->dev, + "THRES_CONV0_MSB write failed: %d\n", ret); + return ret; + } + } + + if (adc->wakeup2_enable) { + int polarity; + + ch1 = adc->wakeup2_data.adc_channel_number; + conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN; + if (adc->wakeup2_data.adc_high_threshold > 0) { + thres = adc->wakeup2_data.adc_high_threshold; + polarity = 0; + } else { + thres = adc->wakeup2_data.adc_low_threshold; + polarity = PALMAS_GPADC_THRES_CONV1_MSB_THRES_CONV1_POL; + } + + ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_THRES_CONV1_LSB, thres & 0xFF); + if (ret < 0) { + dev_err(adc->dev, + "THRES_CONV1_LSB write failed: %d\n", ret); + return ret; + } + + ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_THRES_CONV1_MSB, + ((thres >> 8) & 0xF) | polarity); + if (ret < 0) { + dev_err(adc->dev, + "THRES_CONV1_MSB write failed: %d\n", ret); + return ret; + } + } + + ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_AUTO_SELECT, (ch1 << 4) | ch0); + if (ret < 0) { + dev_err(adc->dev, "AUTO_SELECT write failed: %d\n", ret); + return ret; + } + + ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_AUTO_CTRL, + PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN | + PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN, conv); + if (ret < 0) + dev_err(adc->dev, "AUTO_CTRL write failed: %d\n", ret); + + return ret; +} + +static int palmas_adc_wakeup_reset(struct palmas_gpadc *adc) +{ + int ret; + + ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE, + PALMAS_GPADC_AUTO_SELECT, 0); + if (ret < 0) { + dev_err(adc->dev, "AUTO_SELECT write failed: %d\n", ret); + return ret; + } + + ret = palmas_disable_auto_conversion(adc); + if (ret < 0) + dev_err(adc->dev, "Disable auto conversion failed: %d\n", ret); + + return ret; +} + +static int palmas_gpadc_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct palmas_gpadc *adc = iio_priv(indio_dev); + int wakeup = adc->wakeup1_enable || adc->wakeup2_enable; + int ret; + + if (!device_may_wakeup(dev) || !wakeup) + return 0; + + ret = palmas_adc_wakeup_configure(adc); + if (ret < 0) + return ret; + + if (adc->wakeup1_enable) + enable_irq_wake(adc->irq_auto_0); + + if (adc->wakeup2_enable) + enable_irq_wake(adc->irq_auto_1); + + return 0; +} + +static int palmas_gpadc_resume(struct device *dev) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct palmas_gpadc *adc = iio_priv(indio_dev); + int wakeup = adc->wakeup1_enable || adc->wakeup2_enable; + int ret; + + if (!device_may_wakeup(dev) || !wakeup) + return 0; + + ret = palmas_adc_wakeup_reset(adc); + if (ret < 0) + return ret; + + if (adc->wakeup1_enable) + disable_irq_wake(adc->irq_auto_0); + + if (adc->wakeup2_enable) + disable_irq_wake(adc->irq_auto_1); + + return 0; +}; +#endif + +static const struct dev_pm_ops palmas_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(palmas_gpadc_suspend, + palmas_gpadc_resume) +}; + +static const struct of_device_id of_palmas_gpadc_match_tbl[] = { + { .compatible = "ti,palmas-gpadc", }, + { /* end */ } +}; +MODULE_DEVICE_TABLE(of, of_palmas_gpadc_match_tbl); + +static struct platform_driver palmas_gpadc_driver = { + .probe = palmas_gpadc_probe, + .remove = palmas_gpadc_remove, + .driver = { + .name = MOD_NAME, + .pm = &palmas_pm_ops, + .of_match_table = of_palmas_gpadc_match_tbl, + }, +}; + +static int __init palmas_gpadc_init(void) +{ + return platform_driver_register(&palmas_gpadc_driver); +} +module_init(palmas_gpadc_init); + +static void __exit palmas_gpadc_exit(void) +{ + platform_driver_unregister(&palmas_gpadc_driver); +} +module_exit(palmas_gpadc_exit); + +MODULE_DESCRIPTION("palmas GPADC driver"); +MODULE_AUTHOR("Pradeep Goudagunta"); +MODULE_ALIAS("platform:palmas-gpadc"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3-54-g00ecf