Input: pmic8xxx-keypad - migrate to regmap APIs

Use the regmap APIs for this driver instead of custom pm8xxx
APIs. This breaks this driver's dependency on the pm8xxx APIs and
allows us to easily port it to other bus protocols in the future.

Signed-off-by: Stephen Boyd <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/keyboard/pmic8xxx-keypad.c

···
 #include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/mutex.h>
+#include <linux/regmap.h>
 
-#include <linux/mfd/pm8xxx/core.h>
 #include <linux/input/pmic8xxx-keypad.h>
 
 #define PM8XXX_MAX_ROWS		18
···
  * struct pmic8xxx_kp - internal keypad data structure
  * @pdata - keypad platform data pointer
  * @input - input device pointer for keypad
+ * @regmap - regmap handle
  * @key_sense_irq - key press/release irq number
  * @key_stuck_irq - key stuck notification irq number
  * @keycodes - array to hold the key codes
···
 struct pmic8xxx_kp {
 	const struct pm8xxx_keypad_platform_data *pdata;
 	struct input_dev *input;
+	struct regmap *regmap;
 	int key_sense_irq;
 	int key_stuck_irq;
 
···
 
 	u8 ctrl_reg;
 };
-
-static int pmic8xxx_kp_write_u8(struct pmic8xxx_kp *kp,
-				 u8 data, u16 reg)
-{
-	int rc;
-
-	rc = pm8xxx_writeb(kp->dev->parent, reg, data);
-	return rc;
-}
-
-static int pmic8xxx_kp_read(struct pmic8xxx_kp *kp,
-				 u8 *data, u16 reg, unsigned num_bytes)
-{
-	int rc;
-
-	rc = pm8xxx_read_buf(kp->dev->parent, reg, data, num_bytes);
-	return rc;
-}
-
-static int pmic8xxx_kp_read_u8(struct pmic8xxx_kp *kp,
-				 u8 *data, u16 reg)
-{
-	int rc;
-
-	rc = pmic8xxx_kp_read(kp, data, reg, 1);
-	return rc;
-}
 
 static u8 pmic8xxx_col_state(struct pmic8xxx_kp *kp, u8 col)
 {
···
 static int pmic8xxx_chk_sync_read(struct pmic8xxx_kp *kp)
 {
 	int rc;
-	u8 scan_val;
+	unsigned int scan_val;
 
-	rc = pmic8xxx_kp_read_u8(kp, &scan_val, KEYP_SCAN);
+	rc = regmap_read(kp->regmap, KEYP_SCAN, &scan_val);
 	if (rc < 0) {
 		dev_err(kp->dev, "Error reading KEYP_SCAN reg, rc=%d\n", rc);
 		return rc;
···
 
 	scan_val |= 0x1;
 
-	rc = pmic8xxx_kp_write_u8(kp, scan_val, KEYP_SCAN);
+	rc = regmap_write(kp->regmap, KEYP_SCAN, scan_val);
 	if (rc < 0) {
 		dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc);
 		return rc;
···
 					u16 data_reg, int read_rows)
 {
 	int rc, row;
-	u8 new_data[PM8XXX_MAX_ROWS];
+	unsigned int val;
 
-	rc = pmic8xxx_kp_read(kp, new_data, data_reg, read_rows);
-	if (rc)
-		return rc;
-
-	for (row = 0; row < kp->pdata->num_rows; row++) {
-		dev_dbg(kp->dev, "new_data[%d] = %d\n", row,
-					new_data[row]);
-		state[row] = pmic8xxx_col_state(kp, new_data[row]);
+	for (row = 0; row < read_rows; row++) {
+		rc = regmap_read(kp->regmap, data_reg, &val);
+		if (rc)
+			return rc;
+		dev_dbg(kp->dev, "%d = %d\n", row, val);
+		state[row] = pmic8xxx_col_state(kp, val);
 	}
 
-	return rc;
+	return 0;
 }
 
 static int pmic8xxx_kp_read_matrix(struct pmic8xxx_kp *kp, u16 *new_state,
 					 u16 *old_state)
 {
 	int rc, read_rows;
-	u8 scan_val;
+	unsigned int scan_val;
 
 	if (kp->pdata->num_rows < PM8XXX_MIN_ROWS)
 		read_rows = PM8XXX_MIN_ROWS;
···
 	/* 4 * 32KHz clocks */
 	udelay((4 * DIV_ROUND_UP(USEC_PER_SEC, KEYP_CLOCK_FREQ)) + 1);
 
-	rc = pmic8xxx_kp_read_u8(kp, &scan_val, KEYP_SCAN);
+	rc = regmap_read(kp->regmap, KEYP_SCAN, &scan_val);
 	if (rc < 0) {
 		dev_err(kp->dev, "Error reading KEYP_SCAN reg, rc=%d\n", rc);
 		return rc;
 	}
 
 	scan_val &= 0xFE;
-	rc = pmic8xxx_kp_write_u8(kp, scan_val, KEYP_SCAN);
+	rc = regmap_write(kp->regmap, KEYP_SCAN, scan_val);
 	if (rc < 0)
 		dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc);
 
···
 static irqreturn_t pmic8xxx_kp_irq(int irq, void *data)
 {
 	struct pmic8xxx_kp *kp = data;
-	u8 ctrl_val, events;
+	unsigned int ctrl_val, events;
 	int rc;
 
-	rc = pmic8xxx_kp_read(kp, &ctrl_val, KEYP_CTRL, 1);
+	rc = regmap_read(kp->regmap, KEYP_CTRL, &ctrl_val);
 	if (rc < 0) {
 		dev_err(kp->dev, "failed to read keyp_ctrl register\n");
 		return IRQ_HANDLED;
···
 
 	ctrl_val |= (bits << KEYP_CTRL_SCAN_ROWS_SHIFT);
 
-	rc = pmic8xxx_kp_write_u8(kp, ctrl_val, KEYP_CTRL);
+	rc = regmap_write(kp->regmap, KEYP_CTRL, ctrl_val);
 	if (rc < 0) {
 		dev_err(kp->dev, "Error writing KEYP_CTRL reg, rc=%d\n", rc);
 		return rc;
···
 
 	scan_val |= (cycles << KEYP_SCAN_ROW_HOLD_SHIFT);
 
-	rc = pmic8xxx_kp_write_u8(kp, scan_val, KEYP_SCAN);
+	rc = regmap_write(kp->regmap, KEYP_SCAN, scan_val);
 	if (rc)
 		dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc);
 
···
 
 	kp->ctrl_reg |= KEYP_CTRL_KEYP_EN;
 
-	rc = pmic8xxx_kp_write_u8(kp, kp->ctrl_reg, KEYP_CTRL);
+	rc = regmap_write(kp->regmap, KEYP_CTRL, kp->ctrl_reg);
 	if (rc < 0)
 		dev_err(kp->dev, "Error writing KEYP_CTRL reg, rc=%d\n", rc);
 
···
 
 	kp->ctrl_reg &= ~KEYP_CTRL_KEYP_EN;
 
-	rc = pmic8xxx_kp_write_u8(kp, kp->ctrl_reg, KEYP_CTRL);
+	rc = regmap_write(kp->regmap, KEYP_CTRL, kp->ctrl_reg);
 	if (rc < 0)
 		return rc;
 
···
 	const struct matrix_keymap_data *keymap_data;
 	struct pmic8xxx_kp *kp;
 	int rc;
-	u8 ctrl_val;
+	unsigned int ctrl_val;
 
 	if (!pdata || !pdata->num_cols || !pdata->num_rows ||
 		pdata->num_cols > PM8XXX_MAX_COLS ||
···
 	kp = devm_kzalloc(&pdev->dev, sizeof(*kp), GFP_KERNEL);
 	if (!kp)
 		return -ENOMEM;
+
+	kp->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!kp->regmap)
+		return -ENODEV;
 
 	platform_set_drvdata(pdev, kp);
 
···
 		return rc;
 	}
 
-	rc = pmic8xxx_kp_read_u8(kp, &ctrl_val, KEYP_CTRL);
+	rc = regmap_read(kp->regmap, KEYP_CTRL, &ctrl_val);
 	if (rc < 0) {
 		dev_err(&pdev->dev, "failed to read KEYP_CTRL register\n");
 		return rc;