Commit 8fa25eda authored by Axel Lin's avatar Axel Lin Committed by Mark Brown

regulator: max8997: Properly handle gpio_request failure

Convert to devm_gpio_request to save a few error handling code.

This patch properly handle the gpio_request failure with -EBUSY, we should
return error rather than ommit the gpio_request failure with -EBUSY.

I think one of the reason we got -EBUSY is because current code does not free
gpios in max8997_pmic_remove(). So it got -EBUSY when reload the module.

Yest another reason is in current code if gpio_request() returns -EBUSY,
the rest of the code still calls gpio_direction_output to config buck125_gpios
and set gpio value in max8997_set_gpio().  This looks wrong to me.
Signed-off-by: default avatarAxel Lin <axel.lin@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 8a8e3d59
......@@ -1025,7 +1025,6 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
*/
if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
pdata->buck5_gpiodvs) {
bool gpio1set = false, gpio2set = false;
if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
!gpio_is_valid(pdata->buck125_gpios[1]) ||
......@@ -1035,40 +1034,20 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
goto err_out;
}
ret = gpio_request(pdata->buck125_gpios[0],
"MAX8997 SET1");
if (ret == -EBUSY)
dev_warn(&pdev->dev, "Duplicated gpio request"
" on SET1\n");
else if (ret)
ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
"MAX8997 SET1");
if (ret)
goto err_out;
else
gpio1set = true;
ret = gpio_request(pdata->buck125_gpios[1],
"MAX8997 SET2");
if (ret == -EBUSY)
dev_warn(&pdev->dev, "Duplicated gpio request"
" on SET2\n");
else if (ret) {
if (gpio1set)
gpio_free(pdata->buck125_gpios[0]);
ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
"MAX8997 SET2");
if (ret)
goto err_out;
} else
gpio2set = true;
ret = gpio_request(pdata->buck125_gpios[2],
ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
"MAX8997 SET3");
if (ret == -EBUSY)
dev_warn(&pdev->dev, "Duplicated gpio request"
" on SET3\n");
else if (ret) {
if (gpio1set)
gpio_free(pdata->buck125_gpios[0]);
if (gpio2set)
gpio_free(pdata->buck125_gpios[1]);
if (ret)
goto err_out;
}
gpio_direction_output(pdata->buck125_gpios[0],
(max8997->buck125_gpioindex >> 2)
......@@ -1079,7 +1058,6 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
gpio_direction_output(pdata->buck125_gpios[2],
(max8997->buck125_gpioindex >> 0)
& 0x1); /* SET3 */
ret = 0;
}
/* DVS-GPIO disabled */
......
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