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rx51_battery: convert to iio consumer

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Update rx51-battery driver to use the new IIO API of
twl4030-madc and add DT support.

Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Sebastian Reichel 2014-03-01 21:22:44 +01:00
parent 3c0185046c
commit 57da5e86e6
1 changed files with 66 additions and 24 deletions
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90
drivers/power/rx51_battery.c
View file

@ -24,34 +24,27 @@
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/i2c/twl4030-madc.h>
/* RX51 specific channels */
#define TWL4030_MADC_BTEMP_RX51 TWL4030_MADC_ADCIN0
#define TWL4030_MADC_BCI_RX51 TWL4030_MADC_ADCIN4
#include <linux/iio/consumer.h>
#include <linux/of.h>
struct rx51_device_info {
struct device *dev;
struct power_supply bat;
struct iio_channel *channel_temp;
struct iio_channel *channel_bsi;
struct iio_channel *channel_vbat;
};
/*
* Read ADCIN channel value, code copied from maemo kernel
*/
static int rx51_battery_read_adc(int channel)
static int rx51_battery_read_adc(struct iio_channel *channel)
{
struct twl4030_madc_request req;
req.channels = channel;
req.do_avg = 1;
req.method = TWL4030_MADC_SW1;
req.func_cb = NULL;
req.type = TWL4030_MADC_WAIT;
req.raw = true;
if (twl4030_madc_conversion(&req) <= 0)
return -ENODATA;
return req.rbuf[ffs(channel) - 1];
int val, err;
err = iio_read_channel_average_raw(channel, &val);
if (err < 0)
return err;
return val;
}
/*
@ -60,10 +53,12 @@ static int rx51_battery_read_adc(int channel)
*/
static int rx51_battery_read_voltage(struct rx51_device_info *di)
{
int voltage = rx51_battery_read_adc(TWL4030_MADC_VBAT);
int voltage = rx51_battery_read_adc(di->channel_vbat);
if (voltage < 0)
if (voltage < 0) {
dev_err(di->dev, "Could not read ADC: %d\n", voltage);
return voltage;
}
return 1000 * (10000 * voltage / 1705);
}
@ -112,7 +107,10 @@ static int rx51_battery_read_temperature(struct rx51_device_info *di)
{
int min = 0;
int max = ARRAY_SIZE(rx51_temp_table2) - 1;
int raw = rx51_battery_read_adc(TWL4030_MADC_BTEMP_RX51);
int raw = rx51_battery_read_adc(di->channel_temp);
if (raw < 0)
dev_err(di->dev, "Could not read ADC: %d\n", raw);
/* Zero and negative values are undefined */
if (raw <= 0)
@ -146,10 +144,12 @@ static int rx51_battery_read_temperature(struct rx51_device_info *di)
*/
static int rx51_battery_read_capacity(struct rx51_device_info *di)
{
int capacity = rx51_battery_read_adc(TWL4030_MADC_BCI_RX51);
int capacity = rx51_battery_read_adc(di->channel_bsi);
if (capacity < 0)
if (capacity < 0) {
dev_err(di->dev, "Could not read ADC: %d\n", capacity);
return capacity;
}
return 1280 * (1200 * capacity)/(1024 - capacity);
}
@ -213,17 +213,46 @@ static int rx51_battery_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, di);
di->dev = &pdev->dev;
di->bat.name = dev_name(&pdev->dev);
di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
di->bat.properties = rx51_battery_props;
di->bat.num_properties = ARRAY_SIZE(rx51_battery_props);
di->bat.get_property = rx51_battery_get_property;
di->channel_temp = iio_channel_get(di->dev, "temp");
if (IS_ERR(di->channel_temp)) {
ret = PTR_ERR(di->channel_temp);
goto error;
}
di->channel_bsi = iio_channel_get(di->dev, "bsi");
if (IS_ERR(di->channel_bsi)) {
ret = PTR_ERR(di->channel_bsi);
goto error_channel_temp;
}
di->channel_vbat = iio_channel_get(di->dev, "vbat");
if (IS_ERR(di->channel_vbat)) {
ret = PTR_ERR(di->channel_vbat);
goto error_channel_bsi;
}
ret = power_supply_register(di->dev, &di->bat);
if (ret)
return ret;
goto error_channel_vbat;
return 0;
error_channel_vbat:
iio_channel_release(di->channel_vbat);
error_channel_bsi:
iio_channel_release(di->channel_bsi);
error_channel_temp:
iio_channel_release(di->channel_temp);
error:
return ret;
}
static int rx51_battery_remove(struct platform_device *pdev)
@ -232,15 +261,28 @@ static int rx51_battery_remove(struct platform_device *pdev)
power_supply_unregister(&di->bat);
iio_channel_release(di->channel_vbat);
iio_channel_release(di->channel_bsi);
iio_channel_release(di->channel_temp);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id n900_battery_of_match[] = {
{.compatible = "nokia,n900-battery", },
{ },
};
MODULE_DEVICE_TABLE(of, n900_battery_of_match);
#endif
static struct platform_driver rx51_battery_driver = {
.probe = rx51_battery_probe,
.remove = rx51_battery_remove,
.driver = {
.name = "rx51-battery",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(n900_battery_of_match),
},
};
module_platform_driver(rx51_battery_driver);