ata: palmld: Introduce state container

This creates a state container struct for the Palm LifeDrive
ATA controller, and puts the ATA host and the two GPIO
descriptors into this container.

This avoids using a singleton so potentially multiple
PATA interfaces can be instantiated.
Suggested-by: Marek Vasut <marek.vasut@gmail.com>
Reviewed-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/ata/pata_palmld.c

@@ -33,7 +33,11 @@
 
 #define DRV_NAME "pata_palmld"
 
-static struct gpio_desc *palmld_pata_power;
+struct palmld_pata {
+	struct ata_host *host;
+	struct gpio_desc *power;
+	struct gpio_desc *reset;
+};
 
 static struct scsi_host_template palmld_sht = {
 	ATA_PIO_SHT(DRV_NAME),
@@ -47,16 +51,19 @@ static struct ata_port_operations palmld_port_ops = {
 
 static int palmld_pata_probe(struct platform_device *pdev)
 {
-	struct ata_host *host;
+	struct palmld_pata *lda;
 	struct ata_port *ap;
 	void __iomem *mem;
 	struct device *dev = &pdev->dev;
-	struct gpio_desc *reset;
 	int ret;
 
+	lda = devm_kzalloc(dev, sizeof(*lda), GFP_KERNEL);
+	if (!lda)
+		return -ENOMEM;
+
 	/* allocate host */
-	host = ata_host_alloc(dev, 1);
-	if (!host)
+	lda->host = ata_host_alloc(dev, 1);
+	if (!lda->host)
 		return -ENOMEM;
 
 	/* remap drive's physical memory address */
@@ -65,23 +72,23 @@ static int palmld_pata_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	/* request and activate power and reset GPIOs */
-	palmld_pata_power = devm_gpiod_get(dev, "power", GPIOD_OUT_HIGH);
-	if (IS_ERR(palmld_pata_power))
-		return PTR_ERR(palmld_pata_power);
-	reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
-	if (IS_ERR(reset)) {
-		gpiod_set_value(palmld_pata_power, 0);
-		return PTR_ERR(reset);
+	lda->power = devm_gpiod_get(dev, "power", GPIOD_OUT_HIGH);
+	if (IS_ERR(lda->power))
+		return PTR_ERR(lda->power);
+	lda->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(lda->reset)) {
+		gpiod_set_value(lda->power, 0);
+		return PTR_ERR(lda->reset);
 	}
 
 	/* Assert reset to reset the drive */
-	gpiod_set_value(reset, 1);
+	gpiod_set_value(lda->reset, 1);
 	msleep(30);
-	gpiod_set_value(reset, 0);
+	gpiod_set_value(lda->reset, 0);
 	msleep(30);
 
 	/* setup the ata port */
-	ap = host->ports[0];
+	ap = lda->host->ports[0];
 	ap->ops	= &palmld_port_ops;
 	ap->pio_mask = ATA_PIO4;
 	ap->flags |= ATA_FLAG_PIO_POLLING;
@@ -95,20 +102,26 @@ static int palmld_pata_probe(struct platform_device *pdev)
 	ata_sff_std_ports(&ap->ioaddr);
 
 	/* activate host */
-	ret = ata_host_activate(host, 0, NULL, IRQF_TRIGGER_RISING,
+	ret = ata_host_activate(lda->host, 0, NULL, IRQF_TRIGGER_RISING,
 				&palmld_sht);
 	/* power down on failure */
-	if (ret)
-		gpiod_set_value(palmld_pata_power, 0);
+	if (ret) {
+		gpiod_set_value(lda->power, 0);
 		return ret;
+	}
+
+	platform_set_drvdata(pdev, lda);
+	return 0;
 }
 
-static int palmld_pata_remove(struct platform_device *dev)
+static int palmld_pata_remove(struct platform_device *pdev)
 {
-	ata_platform_remove_one(dev);
+	struct palmld_pata *lda = platform_get_drvdata(pdev);
+
+	ata_platform_remove_one(pdev);
 
 	/* power down the HDD */
-	gpiod_set_value(palmld_pata_power, 0);
+	gpiod_set_value(lda->power, 0);
 
 	return 0;
 }