Re: [PATCH 1/1] input: keyboard: Set configuration registers

[Dmitry Torokhov]

On Fri, Dec 09, 2011 at 03:17:54PM -0800, Stephen Warren wrote:
> Dmitry Torokhov wrote at Friday, December 09, 2011 2:25 PM:
> > On Friday, December 09, 2011 12:10:43 PM Stephen Warren wrote:
> > > Shridhar Rasal wrote at Friday, December 09, 2011 12:29 AM:
> > > > To: dmitry.torokhov@xxxxxxxxx
> > > > Cc: rydberg@xxxxxxxxxxx; Stephen Warren; Rakesh Iyer;
> > > > linux-kernel@xxxxxxxxxxxxxxx; linux- input@xxxxxxxxxxxxxxx;
> > > > linux-tegra@xxxxxxxxxxxxxxx; Shridhar Rasal Subject: [PATCH 1/1] input:
> > > > keyboard: Set configuration registers
> > > >
> > > > -Set only REQUIRED row and column configuration register to
> > > > PROPER values to avoid continuously generating KBC input events.
> > > > -Use *en* field in pin_cfg, to check GPIO_x_ROW_EN register
> > > > should be set or clear.
> > > >
> > > > Signed-off-by: Shridhar Rasal <srasal@xxxxxxxxxx>
> > >
> > > I wondered if num==0 could be used instead of a new en field, but 0 is a
> > > valid row/column number, so no. As such,
> > >
> > > Acked-by: Stephen Warren <swarren@xxxxxxxxxx>
> > 
> > Can we pass in number of pin_cfg instances in pdata and simply do not
> > mention unneeded pins instead?
> 
> IIUC, the array is currently a fixed size (based on the set of pins
> Supported by the KBC), hence that won't work; there's an entry for each
> pin saying which row/column it is.
> 
> However, I suppose if we were to change the structure of the pdata to be:
> 
> struct tegra_kbc_pin_cfg {
>     bool is_row;
>     u8 row_col_id;
>     u8 pin_id;
> };
> 
> Then struct tegra_kbc_platform_data could indeed have a pointer to a
> variable-sized array of these, which would avoid the "en" member.
> 

How about we change bool to enum instead, like in the patch below?

-- 
Dmitry


Input: tegra-kbc - allow skipping setting up some of GPIO pins

From: Shridhar Rasal <srasal@xxxxxxxxxx>

Allow marking some of GPIO pins as ignored to to avoid continuously
generating KBC input events.

Signed-off-by: Shridhar Rasal <srasal@xxxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dtor@xxxxxxx>
---

 arch/arm/mach-tegra/include/mach/kbc.h |    8 +++++++-
 drivers/input/keyboard/tegra-kbc.c     |   34 +++++++++++++++++++++++++-------
 2 files changed, 34 insertions(+), 8 deletions(-)


diff --git a/arch/arm/mach-tegra/include/mach/kbc.h b/arch/arm/mach-tegra/include/mach/kbc.h
index 20bb054..72e28bd 100644
--- a/arch/arm/mach-tegra/include/mach/kbc.h
+++ b/arch/arm/mach-tegra/include/mach/kbc.h
@@ -36,8 +36,14 @@
 #define KBC_MAX_COL	8
 #define KBC_MAX_KEY	(KBC_MAX_ROW * KBC_MAX_COL)
 
+enum tegra_pin_type {
+	PIN_CFG_COL,
+	PIN_CFG_ROW,
+	PIN_CFG_IGNORE,
+};
+
 struct tegra_kbc_pin_cfg {
-	bool is_row;
+	enum tegra_pin_type type;
 	unsigned char num;
 };
 
diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
index a136e2e..09f383a 100644
--- a/drivers/input/keyboard/tegra-kbc.c
+++ b/drivers/input/keyboard/tegra-kbc.c
@@ -455,10 +455,18 @@ static void tegra_kbc_config_pins(struct tegra_kbc *kbc)
 		row_cfg &= ~r_mask;
 		col_cfg &= ~c_mask;
 
-		if (pdata->pin_cfg[i].is_row)
+		switch (pdata->pin_cfg[i].type) {
+		case PIN_CFG_ROW:
 			row_cfg |= ((pdata->pin_cfg[i].num << 1) | 1) << r_shft;
-		else
+			break;
+
+		case PIN_CFG_COL:
 			col_cfg |= ((pdata->pin_cfg[i].num << 1) | 1) << c_shft;
+			break;
+
+		case PIN_CFG_IGNORE:
+			break;
+		}
 
 		writel(row_cfg, kbc->mmio + r_offs);
 		writel(col_cfg, kbc->mmio + c_offs);
@@ -563,7 +571,8 @@ tegra_kbc_check_pin_cfg(const struct tegra_kbc_platform_data *pdata,
 	for (i = 0; i < KBC_MAX_GPIO; i++) {
 		const struct tegra_kbc_pin_cfg *pin_cfg = &pdata->pin_cfg[i];
 
-		if (pin_cfg->is_row) {
+		switch (pin_cfg->type) {
+		case PIN_CFG_ROW:
 			if (pin_cfg->num >= KBC_MAX_ROW) {
 				dev_err(dev,
 					"pin_cfg[%d]: invalid row number %d\n",
@@ -571,13 +580,25 @@ tegra_kbc_check_pin_cfg(const struct tegra_kbc_platform_data *pdata,
 				return false;
 			}
 			(*num_rows)++;
-		} else {
+			break;
+
+		case PIN_CFG_COL:
 			if (pin_cfg->num >= KBC_MAX_COL) {
 				dev_err(dev,
 					"pin_cfg[%d]: invalid column number %d\n",
 					i, pin_cfg->num);
 				return false;
 			}
+			break;
+
+		case PIN_CFG_IGNORE:
+			break;
+
+		default:
+			dev_err(dev,
+				"pin_cfg[%d]: invalid entry type %d\n",
+				pin_cfg->type, pin_cfg->num);
+			return false;
 		}
 	}
 
@@ -594,7 +615,6 @@ tegra_kbc_dt_parse_pdata(struct platform_device *pdev)
 	if (!np)
 		return NULL;
 
-	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return NULL;
 
@@ -616,12 +636,12 @@ tegra_kbc_dt_parse_pdata(struct platform_device *pdev)
 	 */
 	for (i = 0; i < KBC_MAX_ROW; i++) {
 		pdata->pin_cfg[i].num = i;
-		pdata->pin_cfg[i].is_row = true;
+		pdata->pin_cfg[i].type = PIN_CFG_ROW;
 	}
 
 	for (i = 0; i < KBC_MAX_COL; i++) {
 		pdata->pin_cfg[KBC_MAX_ROW + i].num = i;
-		pdata->pin_cfg[KBC_MAX_ROW + i].is_row = false;
+		pdata->pin_cfg[KBC_MAX_ROW + i].type = PIN_CFG_COL;
 	}
 
 	return pdata;
--
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