[PATCH 05/10] Staging: fbtft: Set bus specific ops using separate functions

[Fabio Falzoi <fabio.falzoi84@gmail.com>]

Use two separate functions for spi and platform bus
(flexfb_set_spi_bus_func and flexfb_set_platform_bus_func,
respectively) to set the appropriate write operations.

This patch corrects the following checkpatch errors:
WARNING:LONG_LiINE at lines 446, 450, 466, 476, 489 and 495.
CHECK:PARENTHESIS_ALIGNMENT at line 459.

Signed-off-by: Fabio Falzoi <fabio.falzoi84@gmail.com>
---
 drivers/staging/fbtft/flexfb.c | 154 +++++++++++++++++++++++++----------------
 1 file changed, 94 insertions(+), 60 deletions(-)

diff --git a/drivers/staging/fbtft/flexfb.c b/drivers/staging/fbtft/flexfb.c
index dae092a..1b833f9 100644
--- a/drivers/staging/fbtft/flexfb.c
+++ b/drivers/staging/fbtft/flexfb.c
@@ -382,6 +382,94 @@ static int flexfb_set_regwrite_func(const struct device *dev,
 	return 0;
 }
 
+static int flexfb_emulate_spi_8(struct fbtft_par *par, struct spi_device *sdev)
+{
+	struct device *dev = &sdev->dev;
+	int ret;
+
+	dev_warn(dev, "9-bit SPI not available, emulating using 8-bit.\n");
+	sdev->bits_per_word = 8;
+	ret = sdev->master->setup(sdev);
+	if (ret)
+		return ret;
+
+	/* allocate buffer with room for dc bits */
+	par->extra = devm_kzalloc(par->info->device,
+				  par->txbuf.len + (par->txbuf.len / 8) + 8,
+				  GFP_KERNEL);
+	if (!par->extra)
+		return -ENOMEM;
+	par->fbtftops.write = fbtft_write_spi_emulate_9;
+
+	return 0;
+}
+
+static int flexfb_set_spi_bus_func(struct fbtft_par *par,
+				   struct spi_device *sdev)
+{
+	struct device *dev = &sdev->dev;
+	int ret;
+
+	par->fbtftops.write = fbtft_write_spi;
+	switch (buswidth) {
+	case 8:
+		par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
+		if (!par->startbyte)
+			par->fbtftops.verify_gpios = flexfb_verify_gpios_dc;
+		break;
+	case 9:
+		if (regwidth == 16) {
+			dev_err(dev, "argument 'regwidth': %d is not supported with buswidth=%d and SPI.\n",
+				regwidth, buswidth);
+			return -EINVAL;
+		}
+		par->fbtftops.write_register = fbtft_write_reg8_bus9;
+		par->fbtftops.write_vmem = fbtft_write_vmem16_bus9;
+		sdev->bits_per_word = 9;
+		ret = sdev->master->setup(sdev);
+		if (ret) {
+			ret = flexfb_emulate_spi_8(par, sdev);
+			if (ret)
+				return ret;
+		}
+		break;
+	default:
+		dev_err(dev, "argument 'buswidth': %d is not supported with SPI.\n",
+			buswidth);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int flexfb_set_platform_bus_func(struct fbtft_par *par,
+					struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+
+	par->fbtftops.verify_gpios = flexfb_verify_gpios_db;
+	switch (buswidth) {
+	case 8:
+		par->fbtftops.write = fbtft_write_gpio8_wr;
+		par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
+		break;
+	case 16:
+		par->fbtftops.write_register = fbtft_write_reg16_bus16;
+		if (latched)
+			par->fbtftops.write = fbtft_write_gpio16_wr_latched;
+		else
+			par->fbtftops.write = fbtft_write_gpio16_wr;
+		par->fbtftops.write_vmem = fbtft_write_vmem16_bus16;
+		break;
+	default:
+		dev_err(dev, "argument 'buswidth': %d is not supported with parallel.\n",
+			buswidth);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int flexfb_probe_common(struct spi_device *sdev,
 			       struct platform_device *pdev)
 {
@@ -436,66 +524,12 @@ static int flexfb_probe_common(struct spi_device *sdev,
 	if (ret)
 		goto out_release;
 
-	/* bus functions */
-	if (sdev) {
-		par->fbtftops.write = fbtft_write_spi;
-		switch (buswidth) {
-		case 8:
-			par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
-			if (!par->startbyte)
-				par->fbtftops.verify_gpios = flexfb_verify_gpios_dc;
-			break;
-		case 9:
-			if (regwidth == 16) {
-				dev_err(dev, "argument 'regwidth': %d is not supported with buswidth=%d and SPI.\n", regwidth, buswidth);
-				return -EINVAL;
-			}
-			par->fbtftops.write_register = fbtft_write_reg8_bus9;
-			par->fbtftops.write_vmem = fbtft_write_vmem16_bus9;
-			sdev->bits_per_word = 9;
-			ret = sdev->master->setup(sdev);
-			if (ret) {
-				dev_warn(dev,
-					"9-bit SPI not available, emulating using 8-bit.\n");
-				sdev->bits_per_word = 8;
-				ret = sdev->master->setup(sdev);
-				if (ret)
-					goto out_release;
-				/* allocate buffer with room for dc bits */
-				par->extra = devm_kzalloc(par->info->device,
-						par->txbuf.len + (par->txbuf.len / 8) + 8,
-						GFP_KERNEL);
-				if (!par->extra) {
-					ret = -ENOMEM;
-					goto out_release;
-				}
-				par->fbtftops.write = fbtft_write_spi_emulate_9;
-			}
-			break;
-		default:
-			dev_err(dev, "argument 'buswidth': %d is not supported with SPI.\n", buswidth);
-			return -EINVAL;
-		}
-	} else {
-		par->fbtftops.verify_gpios = flexfb_verify_gpios_db;
-		switch (buswidth) {
-		case 8:
-			par->fbtftops.write = fbtft_write_gpio8_wr;
-			par->fbtftops.write_vmem = fbtft_write_vmem16_bus8;
-			break;
-		case 16:
-			par->fbtftops.write_register = fbtft_write_reg16_bus16;
-			if (latched)
-				par->fbtftops.write = fbtft_write_gpio16_wr_latched;
-			else
-				par->fbtftops.write = fbtft_write_gpio16_wr;
-			par->fbtftops.write_vmem = fbtft_write_vmem16_bus16;
-			break;
-		default:
-			dev_err(dev, "argument 'buswidth': %d is not supported with parallel.\n", buswidth);
-			return -EINVAL;
-		}
-	}
+	if (sdev)
+		ret = flexfb_set_spi_bus_func(par, sdev);
+	else
+		ret = flexfb_set_platform_bus_func(par, pdev);
+	if (ret)
+		goto out_release;
 
 	/* set_addr_win function */
 	switch (setaddrwin) {
-- 
2.1.4