1 files changed, 167 insertions, 57 deletions

diff --git a/drivers/input/keyboard/pxa27x_keypad.c b/drivers/input/keyboard/pxa27x_keypad.c
index 43fb63d6812..8de35b0500f 100644
--- a/drivers/input/keyboard/pxa27x_keypad.c
+++ b/drivers/input/keyboard/pxa27x_keypad.c
@@ -37,20 +37,120 @@
 
 #define DRIVER_NAME		"pxa27x-keypad"
 
-#define KPASMKP(col)		(col/2 == 0 ? KPASMKP0 : \
-				 col/2 == 1 ? KPASMKP1 : \
-				 col/2 == 2 ? KPASMKP2 : KPASMKP3)
-#define KPASMKPx_MKC(row, col)	(1 << (row + 16 * (col % 2)))
+#define KPAS_MUKP(n)		(((n) >> 26) & 0x1f)
+#define KPAS_RP(n)		(((n) >> 4) & 0xf)
+#define KPAS_CP(n)		((n) & 0xf)
 
-static struct clk *pxa27x_keypad_clk;
+#define KPASMKP_MKC_MASK	(0xff)
+
+#define MAX_MATRIX_KEY_NUM	(8 * 8)
+
+struct pxa27x_keypad {
+	struct pxa27x_keypad_platform_data *pdata;
+
+	struct clk *clk;
+	struct input_dev *input_dev;
+
+	/* matrix key code map */
+	unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM];
+
+	/* state row bits of each column scan */
+	uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
+};
+
+static void pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
+{
+	struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
+	struct input_dev *input_dev = keypad->input_dev;
+	unsigned int *key;
+	int i;
+
+	key = &pdata->matrix_key_map[0];
+	for (i = 0; i < pdata->matrix_key_map_size; i++, key++) {
+		int row = ((*key) >> 28) & 0xf;
+		int col = ((*key) >> 24) & 0xf;
+		int code = (*key) & 0xffffff;
+
+		keypad->matrix_keycodes[(row << 3) + col] = code;
+		set_bit(code, input_dev->keybit);
+	}
+}
+
+static inline unsigned int lookup_matrix_keycode(
+		struct pxa27x_keypad *keypad, int row, int col)
+{
+	return keypad->matrix_keycodes[(row << 3) + col];
+}
+
+static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
+{
+	struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
+	int row, col, num_keys_pressed = 0;
+	uint32_t new_state[MAX_MATRIX_KEY_COLS];
+	uint32_t kpas = KPAS;
+
+	num_keys_pressed = KPAS_MUKP(kpas);
+
+	memset(new_state, 0, sizeof(new_state));
+
+	if (num_keys_pressed == 0)
+		goto scan;
+
+	if (num_keys_pressed == 1) {
+		col = KPAS_CP(kpas);
+		row = KPAS_RP(kpas);
+
+		/* if invalid row/col, treat as no key pressed */
+		if (col >= pdata->matrix_key_cols ||
+		    row >= pdata->matrix_key_rows)
+			goto scan;
+
+		new_state[col] = (1 << row);
+		goto scan;
+	}
+
+	if (num_keys_pressed > 1) {
+		uint32_t kpasmkp0 = KPASMKP0;
+		uint32_t kpasmkp1 = KPASMKP1;
+		uint32_t kpasmkp2 = KPASMKP2;
+		uint32_t kpasmkp3 = KPASMKP3;
+
+		new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
+		new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
+		new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
+		new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
+		new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
+		new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
+		new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
+		new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
+	}
+scan:
+	for (col = 0; col < pdata->matrix_key_cols; col++) {
+		uint32_t bits_changed;
+
+		bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
+		if (bits_changed == 0)
+			continue;
+
+		for (row = 0; row < pdata->matrix_key_rows; row++) {
+			if ((bits_changed & (1 << row)) == 0)
+				continue;
+
+			input_report_key(keypad->input_dev,
+				lookup_matrix_keycode(keypad, row, col),
+				new_state[col] & (1 << row));
+		}
+	}
+	input_sync(keypad->input_dev);
+	memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
+}
 
 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
 {
-	struct platform_device *pdev = dev_id;
-	struct pxa27x_keypad_platform_data *pdata = pdev->dev.platform_data;
-	struct input_dev *input_dev = platform_get_drvdata(pdev);
+	struct pxa27x_keypad *keypad = dev_id;
+	struct input_dev *input_dev = keypad->input_dev;
 	unsigned long kpc = KPC;
-	int p, row, col, rel;
+	int rel;
 
 	if (kpc & KPC_DI) {
 		unsigned long kpdk = KPDK;
@@ -75,26 +175,16 @@ static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
 		}
 	}
 
-	if (kpc & KPC_MI) {
-		/* report the status of every button */
-		for (row = 0; row < pdata->nr_rows; row++) {
-			for (col = 0; col < pdata->nr_cols; col++) {
-				p = KPASMKP(col) & KPASMKPx_MKC(row, col) ?
-					1 : 0;
-				pr_debug("keycode %x - pressed %x\n",
-						pdata->keycodes[row][col], p);
-				input_report_key(input_dev,
-						pdata->keycodes[row][col], p);
-			}
-		}
-		input_sync(input_dev);
-	}
+	if (kpc & KPC_MI)
+		pxa27x_keypad_scan_matrix(keypad);
 
 	return IRQ_HANDLED;
 }
 
 static int pxa27x_keypad_open(struct input_dev *dev)
 {
+	struct pxa27x_keypad *keypad = input_get_drvdata(dev);
+
 	/* Set keypad control register */
 	KPC |= (KPC_ASACT |
 		KPC_MS_ALL |
@@ -108,21 +198,24 @@ static int pxa27x_keypad_open(struct input_dev *dev)
 	KPREC = 0x7F;
 
 	/* Enable unit clock */
-	clk_enable(pxa27x_keypad_clk);
+	clk_enable(keypad->clk);
 
 	return 0;
 }
 
 static void pxa27x_keypad_close(struct input_dev *dev)
 {
+	struct pxa27x_keypad *keypad = input_get_drvdata(dev);
+
 	/* Disable clock unit */
-	clk_disable(pxa27x_keypad_clk);
+	clk_disable(keypad->clk);
 }
 
 #ifdef CONFIG_PM
 static int pxa27x_keypad_suspend(struct platform_device *pdev, pm_message_t state)
 {
-	struct pxa27x_keypad_platform_data *pdata = pdev->dev.platform_data;
+	struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
+	struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 
 	/* Save controller status */
 	pdata->reg_kpc = KPC;
@@ -133,8 +226,9 @@ static int pxa27x_keypad_suspend(struct platform_device *pdev, pm_message_t stat
 
 static int pxa27x_keypad_resume(struct platform_device *pdev)
 {
-	struct pxa27x_keypad_platform_data *pdata = pdev->dev.platform_data;
-	struct input_dev *input_dev = platform_get_drvdata(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);
 
@@ -144,8 +238,7 @@ static int pxa27x_keypad_resume(struct platform_device *pdev)
 		KPREC = pdata->reg_kprec;
 
 		/* Enable unit clock */
-		clk_disable(pxa27x_keypad_clk);
-		clk_enable(pxa27x_keypad_clk);
+		clk_enable(keypad->clk);
 	}
 
 	mutex_unlock(&input_dev->mutex);
@@ -159,22 +252,36 @@ static int pxa27x_keypad_resume(struct platform_device *pdev)
 
 static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
 {
-	struct pxa27x_keypad_platform_data *pdata = pdev->dev.platform_data;
+	struct pxa27x_keypad *keypad;
 	struct input_dev *input_dev;
-	int i, row, col, error;
+	int col, error;
 
-	pxa27x_keypad_clk = clk_get(&pdev->dev, "KBDCLK");
-	if (IS_ERR(pxa27x_keypad_clk)) {
-		error = PTR_ERR(pxa27x_keypad_clk);
-		goto err_clk;
+	keypad = kzalloc(sizeof(struct pxa27x_keypad), GFP_KERNEL);
+	if (keypad == NULL) {
+		dev_err(&pdev->dev, "failed to allocate driver data\n");
+		return -ENOMEM;
+	}
+
+	keypad->pdata = pdev->dev.platform_data;
+	if (keypad->pdata == NULL) {
+		dev_err(&pdev->dev, "no platform data defined\n");
+		error = -EINVAL;
+		goto failed_free;
+	}
+
+	keypad->clk = clk_get(&pdev->dev, "KBDCLK");
+	if (IS_ERR(keypad->clk)) {
+		dev_err(&pdev->dev, "failed to get keypad clock\n");
+		error = PTR_ERR(keypad->clk);
+		goto failed_free;
 	}
 
 	/* Create and register the input driver. */
 	input_dev = input_allocate_device();
 	if (!input_dev) {
-		printk(KERN_ERR "Cannot request keypad device\n");
+		dev_err(&pdev->dev, "failed to allocate input device\n");
 		error = -ENOMEM;
-		goto err_alloc;
+		goto failed_put_clk;
 	}
 
 	input_dev->name = DRIVER_NAME;
@@ -183,25 +290,23 @@ static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
 	input_dev->close = pxa27x_keypad_close;
 	input_dev->dev.parent = &pdev->dev;
 
+	keypad->input_dev = input_dev;
+	input_set_drvdata(input_dev, keypad);
+
 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
 		BIT_MASK(EV_REL);
 	input_dev->relbit[BIT_WORD(REL_WHEEL)] = BIT_MASK(REL_WHEEL);
-	for (row = 0; row < pdata->nr_rows; row++) {
-		for (col = 0; col < pdata->nr_cols; col++) {
-			int code = pdata->keycodes[row][col];
-			if (code > 0)
-				set_bit(code, input_dev->keybit);
-		}
-	}
+
+	pxa27x_keypad_build_keycode(keypad);
 
 	error = request_irq(IRQ_KEYPAD, pxa27x_keypad_irq_handler, IRQF_DISABLED,
-			    DRIVER_NAME, pdev);
+			    DRIVER_NAME, keypad);
 	if (error) {
 		printk(KERN_ERR "Cannot request keypad IRQ\n");
 		goto err_free_dev;
 	}
 
-	platform_set_drvdata(pdev, input_dev);
+	platform_set_drvdata(pdev, keypad);
 
 	/* Register the input device */
 	error = input_register_device(input_dev);
@@ -212,10 +317,10 @@ static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
 	 * Store rows/cols info into keyboard registers.
 	 */
 
-	KPC |= (pdata->nr_rows - 1) << 26;
-	KPC |= (pdata->nr_cols - 1) << 23;
+	KPC |= (keypad->pdata->matrix_key_rows - 1) << 26;
+	KPC |= (keypad->pdata->matrix_key_cols - 1) << 23;
 
-	for (col = 0; col < pdata->nr_cols; col++)
+	for (col = 0; col < keypad->pdata->matrix_key_cols; col++)
 		KPC |= KPC_MS0 << col;
 
 	return 0;
@@ -225,21 +330,26 @@ static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
 	free_irq(IRQ_KEYPAD, pdev);
  err_free_dev:
 	input_free_device(input_dev);
- err_alloc:
-	clk_put(pxa27x_keypad_clk);
- err_clk:
+failed_put_clk:
+	clk_put(keypad->clk);
+failed_free:
+	kfree(keypad);
 	return error;
 }
 
 static int __devexit pxa27x_keypad_remove(struct platform_device *pdev)
 {
-	struct input_dev *input_dev = platform_get_drvdata(pdev);
+	struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
 
-	input_unregister_device(input_dev);
 	free_irq(IRQ_KEYPAD, pdev);
-	clk_put(pxa27x_keypad_clk);
-	platform_set_drvdata(pdev, NULL);
 
+	clk_disable(keypad->clk);
+	clk_put(keypad->clk);
+
+	input_unregister_device(keypad->input_dev);
+
+	platform_set_drvdata(pdev, NULL);
+	kfree(keypad);
 	return 0;
 }