iio: adc: mt6360: Add ADC driver for MT6360
Add MT6360 ADC driver including Charger Current, Voltage, and Temperature. Signed-off-by: Gene Chen <gene_chen@richtek.com> Link: https://lore.kernel.org/r/1603181267-15610-4-git-send-email-gene.chen.richtek@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
parent
d4686c52a2
commit
1f4877218f
@ -703,6 +703,17 @@ config MCP3911
|
||||
This driver can also be built as a module. If so, the module will be
|
||||
called mcp3911.
|
||||
|
||||
config MEDIATEK_MT6360_ADC
|
||||
tristate "Mediatek MT6360 ADC driver"
|
||||
depends on MFD_MT6360
|
||||
select IIO_BUFFER
|
||||
select IIO_TRIGGERED_BUFFER
|
||||
help
|
||||
Say Y here to enable MT6360 ADC support.
|
||||
Integrated for System Monitoring includes
|
||||
is used in smartphones and tablets and supports a 11 channel
|
||||
general purpose ADC.
|
||||
|
||||
config MEDIATEK_MT6577_AUXADC
|
||||
tristate "MediaTek AUXADC driver"
|
||||
depends on ARCH_MEDIATEK || COMPILE_TEST
|
||||
|
@ -65,6 +65,7 @@ obj-$(CONFIG_MAX9611) += max9611.o
|
||||
obj-$(CONFIG_MCP320X) += mcp320x.o
|
||||
obj-$(CONFIG_MCP3422) += mcp3422.o
|
||||
obj-$(CONFIG_MCP3911) += mcp3911.o
|
||||
obj-$(CONFIG_MEDIATEK_MT6360_ADC) += mt6360-adc.o
|
||||
obj-$(CONFIG_MEDIATEK_MT6577_AUXADC) += mt6577_auxadc.o
|
||||
obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
|
||||
obj-$(CONFIG_MESON_SARADC) += meson_saradc.o
|
||||
|
372
drivers/iio/adc/mt6360-adc.c
Normal file
372
drivers/iio/adc/mt6360-adc.c
Normal file
@ -0,0 +1,372 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
|
||||
#include <linux/bits.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/irq.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/ktime.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/regmap.h>
|
||||
#include <linux/unaligned/be_byteshift.h>
|
||||
|
||||
#include <linux/iio/buffer.h>
|
||||
#include <linux/iio/iio.h>
|
||||
#include <linux/iio/trigger_consumer.h>
|
||||
#include <linux/iio/triggered_buffer.h>
|
||||
|
||||
#define MT6360_REG_PMUCHGCTRL3 0x313
|
||||
#define MT6360_REG_PMUADCCFG 0x356
|
||||
#define MT6360_REG_PMUADCIDLET 0x358
|
||||
#define MT6360_REG_PMUADCRPT1 0x35A
|
||||
|
||||
/* PMUCHGCTRL3 0x313 */
|
||||
#define MT6360_AICR_MASK GENMASK(7, 2)
|
||||
#define MT6360_AICR_SHFT 2
|
||||
#define MT6360_AICR_400MA 0x6
|
||||
/* PMUADCCFG 0x356 */
|
||||
#define MT6360_ADCEN_MASK BIT(15)
|
||||
/* PMUADCRPT1 0x35A */
|
||||
#define MT6360_PREFERCH_MASK GENMASK(7, 4)
|
||||
#define MT6360_PREFERCH_SHFT 4
|
||||
#define MT6360_RPTCH_MASK GENMASK(3, 0)
|
||||
#define MT6360_NO_PREFER 15
|
||||
|
||||
/* Time in ms */
|
||||
#define ADC_WAIT_TIME_MS 25
|
||||
#define ADC_CONV_TIMEOUT_MS 100
|
||||
#define ADC_LOOP_TIME_US 2000
|
||||
|
||||
enum {
|
||||
MT6360_CHAN_USBID = 0,
|
||||
MT6360_CHAN_VBUSDIV5,
|
||||
MT6360_CHAN_VBUSDIV2,
|
||||
MT6360_CHAN_VSYS,
|
||||
MT6360_CHAN_VBAT,
|
||||
MT6360_CHAN_IBUS,
|
||||
MT6360_CHAN_IBAT,
|
||||
MT6360_CHAN_CHG_VDDP,
|
||||
MT6360_CHAN_TEMP_JC,
|
||||
MT6360_CHAN_VREF_TS,
|
||||
MT6360_CHAN_TS,
|
||||
MT6360_CHAN_MAX
|
||||
};
|
||||
|
||||
struct mt6360_adc_data {
|
||||
struct device *dev;
|
||||
struct regmap *regmap;
|
||||
/* Due to only one set of ADC control, this lock is used to prevent the race condition */
|
||||
struct mutex adc_lock;
|
||||
ktime_t last_off_timestamps[MT6360_CHAN_MAX];
|
||||
};
|
||||
|
||||
static int mt6360_adc_read_channel(struct mt6360_adc_data *mad, int channel, int *val)
|
||||
{
|
||||
__be16 adc_enable;
|
||||
u8 rpt[3];
|
||||
ktime_t predict_end_t, timeout;
|
||||
unsigned int pre_wait_time;
|
||||
int ret;
|
||||
|
||||
mutex_lock(&mad->adc_lock);
|
||||
|
||||
/* Select the preferred ADC channel */
|
||||
ret = regmap_update_bits(mad->regmap, MT6360_REG_PMUADCRPT1, MT6360_PREFERCH_MASK,
|
||||
channel << MT6360_PREFERCH_SHFT);
|
||||
if (ret)
|
||||
goto out_adc_lock;
|
||||
|
||||
adc_enable = cpu_to_be16(MT6360_ADCEN_MASK | BIT(channel));
|
||||
ret = regmap_raw_write(mad->regmap, MT6360_REG_PMUADCCFG, &adc_enable, sizeof(adc_enable));
|
||||
if (ret)
|
||||
goto out_adc_lock;
|
||||
|
||||
predict_end_t = ktime_add_ms(mad->last_off_timestamps[channel], 2 * ADC_WAIT_TIME_MS);
|
||||
|
||||
if (ktime_after(ktime_get(), predict_end_t))
|
||||
pre_wait_time = ADC_WAIT_TIME_MS;
|
||||
else
|
||||
pre_wait_time = 3 * ADC_WAIT_TIME_MS;
|
||||
|
||||
if (msleep_interruptible(pre_wait_time)) {
|
||||
ret = -ERESTARTSYS;
|
||||
goto out_adc_conv;
|
||||
}
|
||||
|
||||
timeout = ktime_add_ms(ktime_get(), ADC_CONV_TIMEOUT_MS);
|
||||
while (true) {
|
||||
ret = regmap_raw_read(mad->regmap, MT6360_REG_PMUADCRPT1, rpt, sizeof(rpt));
|
||||
if (ret)
|
||||
goto out_adc_conv;
|
||||
|
||||
/*
|
||||
* There are two functions, ZCV and TypeC OTP, running ADC VBAT and TS in
|
||||
* background, and ADC samples are taken on a fixed frequency no matter read the
|
||||
* previous one or not.
|
||||
* To avoid conflict, We set minimum time threshold after enable ADC and
|
||||
* check report channel is the same.
|
||||
* The worst case is run the same ADC twice and background function is also running,
|
||||
* ADC conversion sequence is desire channel before start ADC, background ADC,
|
||||
* desire channel after start ADC.
|
||||
* So the minimum correct data is three times of typical conversion time.
|
||||
*/
|
||||
if ((rpt[0] & MT6360_RPTCH_MASK) == channel)
|
||||
break;
|
||||
|
||||
if (ktime_compare(ktime_get(), timeout) > 0) {
|
||||
ret = -ETIMEDOUT;
|
||||
goto out_adc_conv;
|
||||
}
|
||||
|
||||
usleep_range(ADC_LOOP_TIME_US / 2, ADC_LOOP_TIME_US);
|
||||
}
|
||||
|
||||
*val = rpt[1] << 8 | rpt[2];
|
||||
ret = IIO_VAL_INT;
|
||||
|
||||
out_adc_conv:
|
||||
/* Only keep ADC enable */
|
||||
adc_enable = cpu_to_be16(MT6360_ADCEN_MASK);
|
||||
regmap_raw_write(mad->regmap, MT6360_REG_PMUADCCFG, &adc_enable, sizeof(adc_enable));
|
||||
mad->last_off_timestamps[channel] = ktime_get();
|
||||
/* Config prefer channel to NO_PREFER */
|
||||
regmap_update_bits(mad->regmap, MT6360_REG_PMUADCRPT1, MT6360_PREFERCH_MASK,
|
||||
MT6360_NO_PREFER << MT6360_PREFERCH_SHFT);
|
||||
out_adc_lock:
|
||||
mutex_unlock(&mad->adc_lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int mt6360_adc_read_scale(struct mt6360_adc_data *mad, int channel, int *val, int *val2)
|
||||
{
|
||||
unsigned int regval;
|
||||
int ret;
|
||||
|
||||
switch (channel) {
|
||||
case MT6360_CHAN_USBID:
|
||||
case MT6360_CHAN_VSYS:
|
||||
case MT6360_CHAN_VBAT:
|
||||
case MT6360_CHAN_CHG_VDDP:
|
||||
case MT6360_CHAN_VREF_TS:
|
||||
case MT6360_CHAN_TS:
|
||||
*val = 1250;
|
||||
return IIO_VAL_INT;
|
||||
case MT6360_CHAN_VBUSDIV5:
|
||||
*val = 6250;
|
||||
return IIO_VAL_INT;
|
||||
case MT6360_CHAN_VBUSDIV2:
|
||||
case MT6360_CHAN_IBUS:
|
||||
case MT6360_CHAN_IBAT:
|
||||
*val = 2500;
|
||||
|
||||
if (channel == MT6360_CHAN_IBUS) {
|
||||
/* IBUS will be affected by input current limit for the different Ron */
|
||||
/* Check whether the config is <400mA or not */
|
||||
ret = regmap_read(mad->regmap, MT6360_REG_PMUCHGCTRL3, ®val);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
regval = (regval & MT6360_AICR_MASK) >> MT6360_AICR_SHFT;
|
||||
if (regval < MT6360_AICR_400MA)
|
||||
*val = 1900;
|
||||
}
|
||||
|
||||
return IIO_VAL_INT;
|
||||
case MT6360_CHAN_TEMP_JC:
|
||||
*val = 105;
|
||||
*val2 = 100;
|
||||
return IIO_VAL_FRACTIONAL;
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int mt6360_adc_read_offset(struct mt6360_adc_data *mad, int channel, int *val)
|
||||
{
|
||||
*val = (channel == MT6360_CHAN_TEMP_JC) ? -80 : 0;
|
||||
return IIO_VAL_INT;
|
||||
}
|
||||
|
||||
static int mt6360_adc_read_raw(struct iio_dev *iio_dev, const struct iio_chan_spec *chan,
|
||||
int *val, int *val2, long mask)
|
||||
{
|
||||
struct mt6360_adc_data *mad = iio_priv(iio_dev);
|
||||
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_RAW:
|
||||
return mt6360_adc_read_channel(mad, chan->channel, val);
|
||||
case IIO_CHAN_INFO_SCALE:
|
||||
return mt6360_adc_read_scale(mad, chan->channel, val, val2);
|
||||
case IIO_CHAN_INFO_OFFSET:
|
||||
return mt6360_adc_read_offset(mad, chan->channel, val);
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static const char *mt6360_channel_labels[MT6360_CHAN_MAX] = {
|
||||
"usbid", "vbusdiv5", "vbusdiv2", "vsys", "vbat", "ibus", "ibat", "chg_vddp",
|
||||
"temp_jc", "vref_ts", "ts",
|
||||
};
|
||||
|
||||
static int mt6360_adc_read_label(struct iio_dev *iio_dev, const struct iio_chan_spec *chan,
|
||||
char *label)
|
||||
{
|
||||
return snprintf(label, PAGE_SIZE, "%s\n", mt6360_channel_labels[chan->channel]);
|
||||
}
|
||||
|
||||
static const struct iio_info mt6360_adc_iio_info = {
|
||||
.read_raw = mt6360_adc_read_raw,
|
||||
.read_label = mt6360_adc_read_label,
|
||||
};
|
||||
|
||||
#define MT6360_ADC_CHAN(_idx, _type) { \
|
||||
.type = _type, \
|
||||
.channel = MT6360_CHAN_##_idx, \
|
||||
.scan_index = MT6360_CHAN_##_idx, \
|
||||
.datasheet_name = #_idx, \
|
||||
.scan_type = { \
|
||||
.sign = 'u', \
|
||||
.realbits = 16, \
|
||||
.storagebits = 16, \
|
||||
.endianness = IIO_CPU, \
|
||||
}, \
|
||||
.indexed = 1, \
|
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
|
||||
BIT(IIO_CHAN_INFO_SCALE) | \
|
||||
BIT(IIO_CHAN_INFO_OFFSET), \
|
||||
}
|
||||
|
||||
static const struct iio_chan_spec mt6360_adc_channels[] = {
|
||||
MT6360_ADC_CHAN(USBID, IIO_VOLTAGE),
|
||||
MT6360_ADC_CHAN(VBUSDIV5, IIO_VOLTAGE),
|
||||
MT6360_ADC_CHAN(VBUSDIV2, IIO_VOLTAGE),
|
||||
MT6360_ADC_CHAN(VSYS, IIO_VOLTAGE),
|
||||
MT6360_ADC_CHAN(VBAT, IIO_VOLTAGE),
|
||||
MT6360_ADC_CHAN(IBUS, IIO_CURRENT),
|
||||
MT6360_ADC_CHAN(IBAT, IIO_CURRENT),
|
||||
MT6360_ADC_CHAN(CHG_VDDP, IIO_VOLTAGE),
|
||||
MT6360_ADC_CHAN(TEMP_JC, IIO_TEMP),
|
||||
MT6360_ADC_CHAN(VREF_TS, IIO_VOLTAGE),
|
||||
MT6360_ADC_CHAN(TS, IIO_VOLTAGE),
|
||||
IIO_CHAN_SOFT_TIMESTAMP(MT6360_CHAN_MAX),
|
||||
};
|
||||
|
||||
static irqreturn_t mt6360_adc_trigger_handler(int irq, void *p)
|
||||
{
|
||||
struct iio_poll_func *pf = p;
|
||||
struct iio_dev *indio_dev = pf->indio_dev;
|
||||
struct mt6360_adc_data *mad = iio_priv(indio_dev);
|
||||
struct {
|
||||
u16 values[MT6360_CHAN_MAX];
|
||||
int64_t timestamp;
|
||||
} data __aligned(8);
|
||||
int i = 0, bit, val, ret;
|
||||
|
||||
memset(&data, 0, sizeof(data));
|
||||
for_each_set_bit(bit, indio_dev->active_scan_mask, indio_dev->masklength) {
|
||||
ret = mt6360_adc_read_channel(mad, bit, &val);
|
||||
if (ret < 0) {
|
||||
dev_warn(&indio_dev->dev, "Failed to get channel %d conversion val\n", bit);
|
||||
goto out;
|
||||
}
|
||||
|
||||
data.values[i++] = val;
|
||||
}
|
||||
iio_push_to_buffers_with_timestamp(indio_dev, &data, iio_get_time_ns(indio_dev));
|
||||
out:
|
||||
iio_trigger_notify_done(indio_dev->trig);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static inline int mt6360_adc_reset(struct mt6360_adc_data *info)
|
||||
{
|
||||
__be16 adc_enable;
|
||||
ktime_t all_off_time;
|
||||
int i, ret;
|
||||
|
||||
/* Clear ADC idle wait time to 0 */
|
||||
ret = regmap_write(info->regmap, MT6360_REG_PMUADCIDLET, 0);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* Only keep ADC enable, but keep all channels off */
|
||||
adc_enable = cpu_to_be16(MT6360_ADCEN_MASK);
|
||||
ret = regmap_raw_write(info->regmap, MT6360_REG_PMUADCCFG, &adc_enable, sizeof(adc_enable));
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* Reset all channel off time to the current one */
|
||||
all_off_time = ktime_get();
|
||||
for (i = 0; i < MT6360_CHAN_MAX; i++)
|
||||
info->last_off_timestamps[i] = all_off_time;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mt6360_adc_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct mt6360_adc_data *mad;
|
||||
struct regmap *regmap;
|
||||
struct iio_dev *indio_dev;
|
||||
int ret;
|
||||
|
||||
regmap = dev_get_regmap(pdev->dev.parent, NULL);
|
||||
if (!regmap) {
|
||||
dev_err(&pdev->dev, "Failed to get parent regmap\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*mad));
|
||||
if (!indio_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
mad = iio_priv(indio_dev);
|
||||
mad->dev = &pdev->dev;
|
||||
mad->regmap = regmap;
|
||||
mutex_init(&mad->adc_lock);
|
||||
|
||||
ret = mt6360_adc_reset(mad);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "Failed to reset adc\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
indio_dev->name = dev_name(&pdev->dev);
|
||||
indio_dev->dev.parent = &pdev->dev;
|
||||
indio_dev->info = &mt6360_adc_iio_info;
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
indio_dev->channels = mt6360_adc_channels;
|
||||
indio_dev->num_channels = ARRAY_SIZE(mt6360_adc_channels);
|
||||
|
||||
ret = devm_iio_triggered_buffer_setup(&pdev->dev, indio_dev, NULL,
|
||||
mt6360_adc_trigger_handler, NULL);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "Failed to allocate iio trigger buffer\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
return devm_iio_device_register(&pdev->dev, indio_dev);
|
||||
}
|
||||
|
||||
static const struct of_device_id __maybe_unused mt6360_adc_of_id[] = {
|
||||
{ .compatible = "mediatek,mt6360-adc", },
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, mt6360_adc_of_id);
|
||||
|
||||
static struct platform_driver mt6360_adc_driver = {
|
||||
.driver = {
|
||||
.name = "mt6360-adc",
|
||||
.of_match_table = mt6360_adc_of_id,
|
||||
},
|
||||
.probe = mt6360_adc_probe,
|
||||
};
|
||||
module_platform_driver(mt6360_adc_driver);
|
||||
|
||||
MODULE_AUTHOR("Gene Chen <gene_chen@richtek.com>");
|
||||
MODULE_DESCRIPTION("MT6360 ADC Driver");
|
||||
MODULE_LICENSE("GPL v2");
|
Loading…
x
Reference in New Issue
Block a user