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Subject[PATCHv1 1/2] rx51_battery: convert to iio consumer
Date
Update rx51-battery driver to use the new IIO API of
twl4030-madc and add DT support.

Signed-off-by: Sebastian Reichel <sre@debian.org>
---
drivers/power/rx51_battery.c | 68 +++++++++++++++++++++++++++++---------------
1 file changed, 45 insertions(+), 23 deletions(-)

diff --git a/drivers/power/rx51_battery.c b/drivers/power/rx51_battery.c
index 1bc5857..f7cb58e 100644
--- a/drivers/power/rx51_battery.c
+++ b/drivers/power/rx51_battery.c
@@ -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);
}
@@ -213,12 +213,25 @@ 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))
+ return PTR_ERR(di->channel_temp);
+
+ di->channel_bsi = iio_channel_get(di->dev, "bsi");
+ if (IS_ERR(di->channel_bsi))
+ return PTR_ERR(di->channel_bsi);
+
+ di->channel_vbat = iio_channel_get(di->dev, "vbat");
+ if (IS_ERR(di->channel_vbat))
+ return PTR_ERR(di->channel_vbat);
+
ret = power_supply_register(di->dev, &di->bat);
if (ret)
return ret;
@@ -235,12 +248,21 @@ static int rx51_battery_remove(struct platform_device *pdev)
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);
--
1.8.5.3


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