ASoC: tegra+wm8903: Use devm_gpio_request_one

By using this function, the driver no longer needs to explicitly free
the GPIOs. Hence, we can also remove the flags we use to track whether
we allocated these GPIOs.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/tegra/tegra_wm8903.c

@@ -50,10 +50,6 @@
 
 #define DRV_NAME "tegra-snd-wm8903"
 
-#define GPIO_SPKR_EN    BIT(0)
-#define GPIO_HP_MUTE    BIT(1)
-#define GPIO_INT_MIC_EN BIT(2)
-#define GPIO_EXT_MIC_EN BIT(3)
 #define GPIO_HP_DET     BIT(4)
 
 struct tegra_wm8903 {
@@ -401,49 +397,41 @@ static __devinit int tegra_wm8903_driver_probe(struct platform_device *pdev)
 	}
 
 	if (gpio_is_valid(pdata->gpio_spkr_en)) {
-		ret = gpio_request(pdata->gpio_spkr_en, "spkr_en");
+		ret = devm_gpio_request_one(&pdev->dev, pdata->gpio_spkr_en,
+					    GPIOF_OUT_INIT_LOW, "spkr_en");
 		if (ret) {
 			dev_err(card->dev, "cannot get spkr_en gpio\n");
 			return ret;
 		}
-		machine->gpio_requested |= GPIO_SPKR_EN;
-
-		gpio_direction_output(pdata->gpio_spkr_en, 0);
 	}
 
 	if (gpio_is_valid(pdata->gpio_hp_mute)) {
-		ret = gpio_request(pdata->gpio_hp_mute, "hp_mute");
+		ret = devm_gpio_request_one(&pdev->dev, pdata->gpio_hp_mute,
+					    GPIOF_OUT_INIT_HIGH, "hp_mute");
 		if (ret) {
 			dev_err(card->dev, "cannot get hp_mute gpio\n");
 			return ret;
 		}
-		machine->gpio_requested |= GPIO_HP_MUTE;
-
-		gpio_direction_output(pdata->gpio_hp_mute, 1);
 	}
 
 	if (gpio_is_valid(pdata->gpio_int_mic_en)) {
-		ret = gpio_request(pdata->gpio_int_mic_en, "int_mic_en");
+		/* Disable int mic; enable signal is active-high */
+		ret = devm_gpio_request_one(&pdev->dev, pdata->gpio_int_mic_en,
+					    GPIOF_OUT_INIT_LOW, "int_mic_en");
 		if (ret) {
 			dev_err(card->dev, "cannot get int_mic_en gpio\n");
 			return ret;
 		}
-		machine->gpio_requested |= GPIO_INT_MIC_EN;
-
-		/* Disable int mic; enable signal is active-high */
-		gpio_direction_output(pdata->gpio_int_mic_en, 0);
 	}
 
 	if (gpio_is_valid(pdata->gpio_ext_mic_en)) {
-		ret = gpio_request(pdata->gpio_ext_mic_en, "ext_mic_en");
+		/* Enable ext mic; enable signal is active-low */
+		ret = devm_gpio_request_one(&pdev->dev, pdata->gpio_ext_mic_en,
+					    GPIOF_OUT_INIT_LOW, "ext_mic_en");
 		if (ret) {
 			dev_err(card->dev, "cannot get ext_mic_en gpio\n");
 			return ret;
 		}
-		machine->gpio_requested |= GPIO_EXT_MIC_EN;
-
-		/* Enable ext mic; enable signal is active-low */
-		gpio_direction_output(pdata->gpio_ext_mic_en, 0);
 	}
 
 	ret = tegra_asoc_utils_init(&machine->util_data, &pdev->dev);
@@ -469,21 +457,11 @@ static int __devexit tegra_wm8903_driver_remove(struct platform_device *pdev)
 {
 	struct snd_soc_card *card = platform_get_drvdata(pdev);
 	struct tegra_wm8903 *machine = snd_soc_card_get_drvdata(card);
-	struct tegra_wm8903_platform_data *pdata = &machine->pdata;
 
 	if (machine->gpio_requested & GPIO_HP_DET)
 		snd_soc_jack_free_gpios(&tegra_wm8903_hp_jack,
 					1,
 					&tegra_wm8903_hp_jack_gpio);
-	if (machine->gpio_requested & GPIO_EXT_MIC_EN)
-		gpio_free(pdata->gpio_ext_mic_en);
-	if (machine->gpio_requested & GPIO_INT_MIC_EN)
-		gpio_free(pdata->gpio_int_mic_en);
-	if (machine->gpio_requested & GPIO_HP_MUTE)
-		gpio_free(pdata->gpio_hp_mute);
-	if (machine->gpio_requested & GPIO_SPKR_EN)
-		gpio_free(pdata->gpio_spkr_en);
-	machine->gpio_requested = 0;
 
 	snd_soc_unregister_card(card);