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mfd: twl4030-madc: Add DT support and convert to IIO framework 

This converts twl4030-madc module to use the Industrial IO ADC
framework and adds device tree support.

Signed-off-by: Sebastian Reichel <sre@debian.org>
Tested-by: Marek Belisko <marek@goldelico.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Sebastian Reichel 2014-03-16 02:43:26 +01:00 committed by Lee Jones
parent e7f22b7516
commit 2f39b70fef
1 changed files with 117 additions and 12 deletions
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129
drivers/mfd/twl4030-madc.c
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@ -47,11 +47,14 @@
#include <linux/gfp.h>
#include <linux/err.h>
#include <linux/iio/iio.h>
/*
* struct twl4030_madc_data - a container for madc info
* @dev - pointer to device structure for madc
* @lock - mutex protecting this data structure
* @requests - Array of request struct corresponding to SW1, SW2 and RT
* @use_second_irq - IRQ selection (main or co-processor)
* @imr - Interrupt mask register of MADC
* @isr - Interrupt status register of MADC
*/
@ -59,10 +62,71 @@ struct twl4030_madc_data {
struct device *dev;
struct mutex lock; /* mutex protecting this data structure */
struct twl4030_madc_request requests[TWL4030_MADC_NUM_METHODS];
bool use_second_irq;
int imr;
int isr;
};
static int twl4030_madc_read(struct iio_dev *iio_dev,
const struct iio_chan_spec *chan,
int *val, int *val2, long mask)
{
struct twl4030_madc_data *madc = iio_priv(iio_dev);
struct twl4030_madc_request req;
int ret;
req.method = madc->use_second_irq ? TWL4030_MADC_SW2 : TWL4030_MADC_SW1;
req.channels = BIT(chan->channel);
req.active = false;
req.func_cb = NULL;
req.type = TWL4030_MADC_WAIT;
req.raw = !(mask == IIO_CHAN_INFO_PROCESSED);
req.do_avg = (mask == IIO_CHAN_INFO_AVERAGE_RAW);
ret = twl4030_madc_conversion(&req);
if (ret < 0)
return ret;
*val = req.rbuf[chan->channel];
return IIO_VAL_INT;
}
static const struct iio_info twl4030_madc_iio_info = {
.read_raw = &twl4030_madc_read,
.driver_module = THIS_MODULE,
};
#define TWL4030_ADC_CHANNEL(_channel, _type, _name) { \
.type = _type, \
.channel = _channel, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_AVERAGE_RAW) | \
BIT(IIO_CHAN_INFO_PROCESSED), \
.datasheet_name = _name, \
.indexed = 1, \
}
static const struct iio_chan_spec twl4030_madc_iio_channels[] = {
TWL4030_ADC_CHANNEL(0, IIO_VOLTAGE, "ADCIN0"),
TWL4030_ADC_CHANNEL(1, IIO_TEMP, "ADCIN1"),
TWL4030_ADC_CHANNEL(2, IIO_VOLTAGE, "ADCIN2"),
TWL4030_ADC_CHANNEL(3, IIO_VOLTAGE, "ADCIN3"),
TWL4030_ADC_CHANNEL(4, IIO_VOLTAGE, "ADCIN4"),
TWL4030_ADC_CHANNEL(5, IIO_VOLTAGE, "ADCIN5"),
TWL4030_ADC_CHANNEL(6, IIO_VOLTAGE, "ADCIN6"),
TWL4030_ADC_CHANNEL(7, IIO_VOLTAGE, "ADCIN7"),
TWL4030_ADC_CHANNEL(8, IIO_VOLTAGE, "ADCIN8"),
TWL4030_ADC_CHANNEL(9, IIO_VOLTAGE, "ADCIN9"),
TWL4030_ADC_CHANNEL(10, IIO_CURRENT, "ADCIN10"),
TWL4030_ADC_CHANNEL(11, IIO_VOLTAGE, "ADCIN11"),
TWL4030_ADC_CHANNEL(12, IIO_VOLTAGE, "ADCIN12"),
TWL4030_ADC_CHANNEL(13, IIO_VOLTAGE, "ADCIN13"),
TWL4030_ADC_CHANNEL(14, IIO_VOLTAGE, "ADCIN14"),
TWL4030_ADC_CHANNEL(15, IIO_VOLTAGE, "ADCIN15"),
};
static struct twl4030_madc_data *twl4030_madc;
struct twl4030_prescale_divider_ratios {
@ -702,28 +766,49 @@ static int twl4030_madc_probe(struct platform_device *pdev)
{
struct twl4030_madc_data *madc;
struct twl4030_madc_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct device_node *np = pdev->dev.of_node;
int irq, ret;
u8 regval;
struct iio_dev *iio_dev = NULL;
if (!pdata) {
dev_err(&pdev->dev, "platform_data not available\n");
if (!pdata && !np) {
dev_err(&pdev->dev, "neither platform data nor Device Tree node available\n");
return -EINVAL;
}
madc = devm_kzalloc(&pdev->dev, sizeof(*madc), GFP_KERNEL);
if (!madc)
return -ENOMEM;
iio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*madc));
if (!iio_dev) {
dev_err(&pdev->dev, "failed allocating iio device\n");
return -ENOMEM;
}
madc = iio_priv(iio_dev);
madc->dev = &pdev->dev;
iio_dev->name = dev_name(&pdev->dev);
iio_dev->dev.parent = &pdev->dev;
iio_dev->dev.of_node = pdev->dev.of_node;
iio_dev->info = &twl4030_madc_iio_info;
iio_dev->modes = INDIO_DIRECT_MODE;
iio_dev->channels = twl4030_madc_iio_channels;
iio_dev->num_channels = ARRAY_SIZE(twl4030_madc_iio_channels);
/*
* Phoenix provides 2 interrupt lines. The first one is connected to
* the OMAP. The other one can be connected to the other processor such
* as modem. Hence two separate ISR and IMR registers.
*/
madc->imr = (pdata->irq_line == 1) ?
TWL4030_MADC_IMR1 : TWL4030_MADC_IMR2;
madc->isr = (pdata->irq_line == 1) ?
TWL4030_MADC_ISR1 : TWL4030_MADC_ISR2;
if (pdata)
madc->use_second_irq = (pdata->irq_line != 1);
else
madc->use_second_irq = of_property_read_bool(np,
"ti,system-uses-second-madc-irq");
madc->imr = madc->use_second_irq ? TWL4030_MADC_IMR2 :
TWL4030_MADC_IMR1;
madc->isr = madc->use_second_irq ? TWL4030_MADC_ISR2 :
TWL4030_MADC_ISR1;
ret = twl4030_madc_set_power(madc, 1);
if (ret < 0)
return ret;
@ -768,7 +853,7 @@ static int twl4030_madc_probe(struct platform_device *pdev)
}
}
platform_set_drvdata(pdev, madc);
platform_set_drvdata(pdev, iio_dev);
mutex_init(&madc->lock);
irq = platform_get_irq(pdev, 0);
@ -776,11 +861,19 @@ static int twl4030_madc_probe(struct platform_device *pdev)
twl4030_madc_threaded_irq_handler,
IRQF_TRIGGER_RISING, "twl4030_madc", madc);
if (ret) {
dev_dbg(&pdev->dev, "could not request irq\n");
dev_err(&pdev->dev, "could not request irq\n");
goto err_i2c;
}
twl4030_madc = madc;
ret = iio_device_register(iio_dev);
if (ret) {
dev_err(&pdev->dev, "could not register iio device\n");
goto err_i2c;
}
return 0;
err_i2c:
twl4030_madc_set_current_generator(madc, 0, 0);
err_current_generator:
@ -790,7 +883,10 @@ err_current_generator:
static int twl4030_madc_remove(struct platform_device *pdev)
{
struct twl4030_madc_data *madc = platform_get_drvdata(pdev);
struct iio_dev *iio_dev = platform_get_drvdata(pdev);
struct twl4030_madc_data *madc = iio_priv(iio_dev);
iio_device_unregister(iio_dev);
twl4030_madc_set_current_generator(madc, 0, 0);
twl4030_madc_set_power(madc, 0);
@ -798,12 +894,21 @@ static int twl4030_madc_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id twl_madc_of_match[] = {
{ .compatible = "ti,twl4030-madc", },
{ },
};
MODULE_DEVICE_TABLE(of, twl_madc_of_match);
#endif
static struct platform_driver twl4030_madc_driver = {
.probe = twl4030_madc_probe,
.remove = twl4030_madc_remove,
.driver = {
.name = "twl4030_madc",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(twl_madc_of_match),
},
};