Staging: mrst-touchscreen - register platform interface

AC: Reworked to merge with upstream input device work from Dmitry et al.

Signed-off-by: Alek Du <alek.du@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 35 insertions, 33 deletions

diff --git a/drivers/staging/mrst-touchscreen/intel-mid-touch.c b/drivers/staging/mrst-touchscreen/intel-mid-touch.c
index be7ba7b47591..9333b9e09598 100644
--- a/drivers/staging/mrst-touchscreen/intel-mid-touch.c
+++ b/drivers/staging/mrst-touchscreen/intel-mid-touch.c
@@ -32,7 +32,8 @@
 #include <linux/interrupt.h>
 #include <linux/err.h>
 #include <linux/param.h>
-#include <linux/spi/spi.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
 #include <linux/irq.h>
 #include <linux/delay.h>
 #include <asm/intel_scu_ipc.h>
@@ -94,7 +95,7 @@
 
 /* Touch screen device structure */
 struct mrstouch_dev {
-        struct spi_device *spi;
+        struct device *dev; /* device associated with touch screen */
         struct input_dev *input;
         char phys[32];
         u16 asr;                /* Address selection register */
@@ -162,7 +163,7 @@ static int mrstouch_nec_adc_read_finish(struct mrstouch_dev *tsdev)
 
                 if (!pendet_enabled) {
                         if (++retry >= 10) {
-                                dev_err(&tsdev->spi->dev,
+                                dev_err(tsdev->dev,
                                         "Touch screen disabled.\n");
                                 return -EIO;
                         }
@@ -282,7 +283,7 @@ static int mrstouch_nec_adc_read(struct mrstouch_dev *tsdev,
         return 0;
 
 ipc_error:
-        dev_err(&tsdev->spi->dev, "ipc error during adc read\n");
+        dev_err(tsdev->dev, "ipc error during adc read\n");
         return err;
 }
 
@@ -341,7 +342,7 @@ static int mrstouch_fs_adc_read_prepare(struct mrstouch_dev *tsdev)
         return 0;
 
 ipc_error:
-        dev_err(&tsdev->spi->dev, "ipc error during %s\n", __func__);
+        dev_err(tsdev->dev, "ipc error during %s\n", __func__);
         return err;
 }
 
@@ -387,7 +388,7 @@ static int mrstouch_fs_adc_read(struct mrstouch_dev *tsdev,
         return 0;
 
 ipc_error:
-        dev_err(&tsdev->spi->dev, "ipc error during %s\n", __func__);
+        dev_err(tsdev->dev, "ipc error during %s\n", __func__);
         return err;
 }
 
@@ -428,7 +429,7 @@ static int mrstouch_fs_adc_read_finish(struct mrstouch_dev *tsdev)
         return 0;
 
 ipc_error:
-        dev_err(&tsdev->spi->dev, "ipc error during %s\n", __func__);
+        dev_err(tsdev->dev, "ipc error during %s\n", __func__);
         return err;
 }
 
@@ -560,7 +561,7 @@ static int __devinit mrstouch_adc_init(struct mrstouch_dev *tsdev)
 
         err = mrstouch_read_pmic_id(&tsdev->vendor, &tsdev->rev);
         if (err) {
-                dev_err(&tsdev->spi->dev, "Unable to read PMIC id\n");
+                dev_err(tsdev->dev, "Unable to read PMIC id\n");
                 return err;
         }
 
@@ -579,14 +580,14 @@ static int __devinit mrstouch_adc_init(struct mrstouch_dev *tsdev)
                 break;
 
         default:
-                dev_err(&tsdev->spi->dev,
+                dev_err(tsdev->dev,
                         "Unsupported touchscreen: %d\n", tsdev->vendor);
                 return -ENXIO;
         }
 
         start = mrstouch_chan_parse(tsdev);
         if (start < 0) {
-                dev_err(&tsdev->spi->dev, "Unable to parse channels\n");
+                dev_err(tsdev->dev, "Unable to parse channels\n");
                 return start;
         }
 
@@ -627,41 +628,43 @@ static int __devinit mrstouch_adc_init(struct mrstouch_dev *tsdev)
 
 
 /* Probe function for touch screen driver */
-static int __devinit mrstouch_probe(struct spi_device *spi)
+static int __devinit mrstouch_probe(struct platform_device *pdev)
 {
         struct mrstouch_dev *tsdev;
         struct input_dev *input;
         int err;
+        int irq;
 
-        if (!spi->irq) {
-                dev_err(&spi->dev, "no interrupt assigned\n");
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0) {
+                dev_err(&pdev->dev, "no interrupt assigned\n");
                 return -EINVAL;
         }
 
         tsdev = kzalloc(sizeof(struct mrstouch_dev), GFP_KERNEL);
         input = input_allocate_device();
         if (!tsdev || !input) {
-                dev_err(&spi->dev, "unable to allocate memory\n");
+                dev_err(&pdev->dev, "unable to allocate memory\n");
                 err = -ENOMEM;
                 goto err_free_mem;
         }
 
-        tsdev->spi = spi;
+        tsdev->dev = &pdev->dev;
         tsdev->input = input;
-        tsdev->irq = spi->irq;
+        tsdev->irq = irq;
 
         snprintf(tsdev->phys, sizeof(tsdev->phys),
-                 "%s/input0", dev_name(&spi->dev));
+                 "%s/input0", dev_name(tsdev->dev));
 
         err = mrstouch_adc_init(tsdev);
         if (err) {
-                dev_err(&spi->dev, "ADC initialization failed\n");
+                dev_err(&pdev->dev, "ADC initialization failed\n");
                 goto err_free_mem;
         }
 
         input->name = "mrst_touchscreen";
         input->phys = tsdev->phys;
-        input->dev.parent = &spi->dev;
+        input->dev.parent = tsdev->dev;
 
         input->id.vendor = tsdev->vendor;
         input->id.version = tsdev->rev;
@@ -679,17 +682,17 @@ static int __devinit mrstouch_probe(struct spi_device *spi)
         err = request_threaded_irq(tsdev->irq, NULL, mrstouch_pendet_irq,
                                    0, "mrstouch", tsdev);
         if (err) {
-                dev_err(&tsdev->spi->dev, "unable to allocate irq\n");
+                dev_err(tsdev->dev, "unable to allocate irq\n");
                 goto err_free_mem;
         }
 
         err = input_register_device(tsdev->input);
         if (err) {
-                dev_err(&tsdev->spi->dev, "unable to register input device\n");
+                dev_err(tsdev->dev, "unable to register input device\n");
                 goto err_free_irq;
         }
 
-        spi_set_drvdata(spi, tsdev);
+        platform_set_drvdata(pdev, tsdev);
         return 0;
 
 err_free_irq:
@@ -700,38 +703,37 @@ err_free_mem:
         return err;
 }
 
-static int __devexit mrstouch_remove(struct spi_device *spi)
+static int __devexit mrstouch_remove(struct platform_device *pdev)
 {
-        struct mrstouch_dev *tsdev = spi_get_drvdata(spi);
+        struct mrstouch_dev *tsdev = platform_get_drvdata(pdev);
 
         free_irq(tsdev->irq, tsdev);
         input_unregister_device(tsdev->input);
         kfree(tsdev);
 
-        spi_set_drvdata(spi, NULL);
+        platform_set_drvdata(pdev, NULL);
 
         return 0;
 }
 
-static struct spi_driver mrstouch_driver = {
+static struct platform_driver mrstouch_driver = {
         .driver = {
-                .name   = "pmic_touch",
-                .bus    = &spi_bus_type,
-                .owner  = THIS_MODULE,
+                .name   = "pmic_touch",
+                .owner  = THIS_MODULE,
         },
-        .probe          = mrstouch_probe,
-        .remove         = __devexit_p(mrstouch_remove),
+        .probe          = mrstouch_probe,
+        .remove         = __devexit_p(mrstouch_remove),
 };
 
 static int __init mrstouch_init(void)
 {
-        return spi_register_driver(&mrstouch_driver);
+        return platform_driver_register(&mrstouch_driver);
 }
 module_init(mrstouch_init);
 
 static void __exit mrstouch_exit(void)
 {
-        spi_unregister_driver(&mrstouch_driver);
+        platform_driver_unregister(&mrstouch_driver);
 }
 module_exit(mrstouch_exit);