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SubjectRe: [PATCHv1 1/2] rx51_battery: convert to iio consumer
On 01/03/14 11:17, Jonathan Cameron wrote:
> On 26/02/14 00:46, Sebastian Reichel wrote:
>> 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>
> The error handling needs tidying up.
> Otherwise this looks fine to me. Note that you (really me)
> may get some grief over the DT bindings. Theoretically we have
> been planning to rewrite those entirely for some time...

It's a longer term point, but it does rather feel like it ought
to be possible to write a generic battery driver sometime down
the line where any conversion characteristics would be in the device
tree. Definitely a question for the future though!

>> ---
>> 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);
> You need to unwind the iio_channel_get that did succeed if we get here.
> Otherwise references to the iio driver will still be held despite
> this driver failing to probe.
>
>> +
>> + 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);
>>
>
> --
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