Input: pxa27x_keypad - introduce pxa27x_keypad_config()

Introduce pxa27x_keypad_config() for keypad registers configuration
and remove the reg_kpc, reg_kprec from platform data structure
so that configurations of keypad registers can be centralized to a
single function.

It can also be re-used when resuming.

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 28 insertions, 32 deletions

diff --git a/drivers/input/keyboard/pxa27x_keypad.c b/drivers/input/keyboard/pxa27x_keypad.c
index 8de35b0500f3..e9d4e227a009 100644
--- a/drivers/input/keyboard/pxa27x_keypad.c
+++ b/drivers/input/keyboard/pxa27x_keypad.c
@@ -37,6 +37,10 @@
 
 #define DRIVER_NAME             "pxa27x-keypad"
 
+#define KPC_MKRN(n)     ((((n) & 0x7) - 1) << 26) /* matrix key row number */
+#define KPC_MKCN(n)     ((((n) & 0x7) - 1) << 23) /* matrix key column number */
+#define KPC_DKN(n)      ((((n) & 0x7) - 1) << 6)  /* direct key number */
+
 #define KPAS_MUKP(n)            (((n) >> 26) & 0x1f)
 #define KPAS_RP(n)              (((n) >> 4) & 0xf)
 #define KPAS_CP(n)              ((n) & 0xf)
@@ -145,6 +149,8 @@ scan:
         memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
 }
 
+#define DEFAULT_KPREC   (0x007f007f)
+
 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
 {
         struct pxa27x_keypad *keypad = dev_id;
@@ -181,24 +187,32 @@ static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
         return IRQ_HANDLED;
 }
 
-static int pxa27x_keypad_open(struct input_dev *dev)
+static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
 {
-        struct pxa27x_keypad *keypad = input_get_drvdata(dev);
+        struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
+        unsigned long kpc = 0;
 
-        /* Set keypad control register */
-        KPC |= (KPC_ASACT |
-                KPC_MS_ALL |
-                (2 << 6) | KPC_REE0 | KPC_DK_DEB_SEL |
-                KPC_ME | KPC_MIE | KPC_DE | KPC_DIE);
+        /* enable matrix keys with automatic scan */
+        if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
+                kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
+                kpc |= KPC_MKRN(pdata->matrix_key_rows) |
+                       KPC_MKCN(pdata->matrix_key_cols);
+        }
 
-        KPC &= ~KPC_AS;         /* disable automatic scan */
-        KPC &= ~KPC_IMKP;       /* do not ignore multiple keypresses */
+        /* FIXME: hardcoded to enable rotary 0 _only_ */
+        kpc |= KPC_DKN(2) | KPC_REE0 | KPC_DI | KPC_DIE;
 
-        /* Set rotary count to mid-point value */
-        KPREC = 0x7F;
+        KPC = kpc;
+        KPREC = DEFAULT_KPREC;
+}
+
+static int pxa27x_keypad_open(struct input_dev *dev)
+{
+        struct pxa27x_keypad *keypad = input_get_drvdata(dev);
 
         /* Enable unit clock */
         clk_enable(keypad->clk);
+        pxa27x_keypad_config(keypad);
 
         return 0;
 }
@@ -215,30 +229,22 @@ static void pxa27x_keypad_close(struct input_dev *dev)
 static int pxa27x_keypad_suspend(struct platform_device *pdev, pm_message_t state)
 {
         struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
-        struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
-
-        /* Save controller status */
-        pdata->reg_kpc = KPC;
-        pdata->reg_kprec = KPREC;
 
+        clk_disable(keypad->clk);
         return 0;
 }
 
 static int pxa27x_keypad_resume(struct platform_device *pdev)
 {
         struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
-        struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
         struct input_dev *input_dev = keypad->input_dev;
 
         mutex_lock(&input_dev->mutex);
 
         if (input_dev->users) {
-                /* Restore controller status */
-                KPC = pdata->reg_kpc;
-                KPREC = pdata->reg_kprec;
-
                 /* Enable unit clock */
                 clk_enable(keypad->clk);
+                pxa27x_keypad_config(keypad);
         }
 
         mutex_unlock(&input_dev->mutex);
@@ -254,7 +260,7 @@ static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
 {
         struct pxa27x_keypad *keypad;
         struct input_dev *input_dev;
-        int col, error;
+        int error;
 
         keypad = kzalloc(sizeof(struct pxa27x_keypad), GFP_KERNEL);
         if (keypad == NULL) {
@@ -313,16 +319,6 @@ static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
         if (error)
                 goto err_free_irq;
 
-        /*
-         * Store rows/cols info into keyboard registers.
-         */
-
-        KPC |= (keypad->pdata->matrix_key_rows - 1) << 26;
-        KPC |= (keypad->pdata->matrix_key_cols - 1) << 23;
-
-        for (col = 0; col < keypad->pdata->matrix_key_cols; col++)
-                KPC |= KPC_MS0 << col;
-
         return 0;
 
  err_free_irq: