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

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

[Shridhar Rasal]

-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@nvidia.com>
---
 arch/arm/mach-tegra/include/mach/kbc.h |    1 +
 drivers/input/keyboard/tegra-kbc.c     |   13 ++++++++-----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/arch/arm/mach-tegra/include/mach/kbc.h b/arch/arm/mach-tegra/include/mach/kbc.h
index 4f3572a..2212284 100644
--- a/arch/arm/mach-tegra/include/mach/kbc.h
+++ b/arch/arm/mach-tegra/include/mach/kbc.h
@@ -38,6 +38,7 @@
 
 struct tegra_kbc_pin_cfg {
 	bool is_row;
+	bool en;
 	unsigned char num;
 };
 
diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
index cf3228b..faf4f3e 100644
--- a/drivers/input/keyboard/tegra-kbc.c
+++ b/drivers/input/keyboard/tegra-kbc.c
@@ -447,11 +447,14 @@ 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)
-			row_cfg |= ((pdata->pin_cfg[i].num << 1) | 1) << r_shft;
-		else
-			col_cfg |= ((pdata->pin_cfg[i].num << 1) | 1) << c_shft;
-
+		if (pdata->pin_cfg[i].en) {
+			if (pdata->pin_cfg[i].is_row)
+				row_cfg |= ((pdata->pin_cfg[i].num << 1) | 1)
+						<< r_shft;
+			else
+				col_cfg |= ((pdata->pin_cfg[i].num << 1) | 1)
+						<< c_shft;
+		}
 		writel(row_cfg, kbc->mmio + r_offs);
 		writel(col_cfg, kbc->mmio + c_offs);
 	}
-- 
1.7.1

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

[Stephen Warren]

Shridhar Rasal wrote at Friday, December 09, 2011 12:29 AM:
> To: dmitry.torokhov@gmail.com
> Cc: rydberg@euromail.se; Stephen Warren; Rakesh Iyer; linux-kernel@vger.kernel.org; linux-
> input@vger.kernel.org; linux-tegra@vger.kernel.org; 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@nvidia.com>

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@nvidia.com>

-- 
nvpublic

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

[Dmitry Torokhov]

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@gmail.com
> > Cc: rydberg@euromail.se; Stephen Warren; Rakesh Iyer;
> > linux-kernel@vger.kernel.org; linux- input@vger.kernel.org;
> > linux-tegra@vger.kernel.org; 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@nvidia.com>
> 
> 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@nvidia.com>

Can we pass in number of pin_cfg instances in pdata and simply do not
mention unneeded pins instead?

Thanks.

-- 
Dmitry

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

[Stephen Warren]

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@gmail.com
> > > Cc: rydberg@euromail.se; Stephen Warren; Rakesh Iyer;
> > > linux-kernel@vger.kernel.org; linux- input@vger.kernel.org;
> > > linux-tegra@vger.kernel.org; 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@nvidia.com>
> >
> > 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@nvidia.com>
> 
> 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.

-- 
nvpublic

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@gmail.com
> > > > Cc: rydberg@euromail.se; Stephen Warren; Rakesh Iyer;
> > > > linux-kernel@vger.kernel.org; linux- input@vger.kernel.org;
> > > > linux-tegra@vger.kernel.org; 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@nvidia.com>
> > >
> > > 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@nvidia.com>
> > 
> > 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@nvidia.com>

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

Signed-off-by: Shridhar Rasal <srasal@nvidia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

 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;

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

[Dmitry Torokhov]

On Thu, Dec 29, 2011 at 07:25:59PM -0800, Dmitry Torokhov wrote:
> 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@gmail.com
> > > > > Cc: rydberg@euromail.se; Stephen Warren; Rakesh Iyer;
> > > > > linux-kernel@vger.kernel.org; linux- input@vger.kernel.org;
> > > > > linux-tegra@vger.kernel.org; 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@nvidia.com>
> > > >
> > > > 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@nvidia.com>
> > > 
> > > 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?
> 

*ping*

> -- 
> Dmitry
> 
> 
> Input: tegra-kbc - allow skipping setting up some of GPIO pins
> 
> From: Shridhar Rasal <srasal@nvidia.com>
> 
> Allow marking some of GPIO pins as ignored to to avoid continuously
> generating KBC input events.
> 
> Signed-off-by: Shridhar Rasal <srasal@nvidia.com>
> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
> ---
> 
>  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;

-- 
Dmitry

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

[Stephen Warren]

Dmitry Torokhov wrote at Tuesday, January 31, 2012 12:09 PM:
> On Thu, Dec 29, 2011 at 07:25:59PM -0800, Dmitry Torokhov wrote:
> > 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@gmail.com
> > > > > > Cc: rydberg@euromail.se; Stephen Warren; Rakesh Iyer;
> > > > > > linux-kernel@vger.kernel.org; linux- input@vger.kernel.org;
> > > > > > linux-tegra@vger.kernel.org; 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@nvidia.com>
> > > > >
> > > > > 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@nvidia.com>
> > > >
> > > > 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?
> 
> *ping*

That's conceptually fine by me. I was assuming you were asking Rakesh...

I'd rather PIN_CFG_IGNORE was the first enum, so it gets value 0, or this
probably won't solve the original issue?

-- 
nvpublic

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

[Dmitry Torokhov]

On Tue, Jan 31, 2012 at 11:29:35AM -0800, Stephen Warren wrote:
> Dmitry Torokhov wrote at Tuesday, January 31, 2012 12:09 PM:
> > On Thu, Dec 29, 2011 at 07:25:59PM -0800, Dmitry Torokhov wrote:
> > > 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@gmail.com
> > > > > > > Cc: rydberg@euromail.se; Stephen Warren; Rakesh Iyer;
> > > > > > > linux-kernel@vger.kernel.org; linux- input@vger.kernel.org;
> > > > > > > linux-tegra@vger.kernel.org; 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@nvidia.com>
> > > > > >
> > > > > > 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@nvidia.com>
> > > > >
> > > > > 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?
> > 
> > *ping*
> 
> That's conceptually fine by me. I was assuming you were asking Rakesh...

Everyone... Anyone ;)

> 
> I'd rather PIN_CFG_IGNORE was the first enum, so it gets value 0, or this
> probably won't solve the original issue?

The benefit of current definition is that it is compatible with old
ones using bool...

Thanks.

-- 
Dmitry

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

[Stephen Warren]

Dmitry Torokhov wrote at Tuesday, January 31, 2012 12:48 PM:
> On Tue, Jan 31, 2012 at 11:29:35AM -0800, Stephen Warren wrote:
> > Dmitry Torokhov wrote at Tuesday, January 31, 2012 12:09 PM:
> > > On Thu, Dec 29, 2011 at 07:25:59PM -0800, Dmitry Torokhov wrote:
> > > > On Fri, Dec 09, 2011 at 03:17:54PM -0800, Stephen Warren wrote:
...
> > > > > 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?
...
> > I'd rather PIN_CFG_IGNORE was the first enum, so it gets value 0, or this
> > probably won't solve the original issue?
> 
> The benefit of current definition is that it is compatible with old
> ones using bool...

There are no in-tree users of this type yet, so compatibility isn't
really an issue. And if we don't make that change, anyone who does start
to use it is going to have to initialize every element of the array even
when they aren't used.

-- 
nvpublic

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

[Shridhar Rasal]

On 02/01/2012 01:17 AM, Dmitry Torokhov wrote:
> On Tue, Jan 31, 2012 at 11:29:35AM -0800, Stephen Warren wrote:
>> Dmitry Torokhov wrote at Tuesday, January 31, 2012 12:09 PM:
>>> On Thu, Dec 29, 2011 at 07:25:59PM -0800, Dmitry Torokhov wrote:
>>>> 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@gmail.com
>>>>>>>> Cc: rydberg@euromail.se; Stephen Warren; Rakesh Iyer;
>>>>>>>> linux-kernel@vger.kernel.org; linux- input@vger.kernel.org;
>>>>>>>> linux-tegra@vger.kernel.org; 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@nvidia.com>
>>>>>>> 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@nvidia.com>
>>>>>> 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?
>>> *ping*
>> That's conceptually fine by me. I was assuming you were asking Rakesh...
> Everyone... Anyone ;)
>
>> I'd rather PIN_CFG_IGNORE was the first enum, so it gets value 0, or this
>> probably won't solve the original issue?
> The benefit of current definition is that it is compatible with old
> ones using bool...
>
> Thanks.
Sorry for delay in response.
I am OK with new definition. Agree, makes compatible with old definitions.
Thanks!

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

[Stephen Warren]

On 03/26/2012 11:17 PM, Shridhar Rasal wrote:
> On 02/01/2012 01:17 AM, Dmitry Torokhov wrote:
>> On Tue, Jan 31, 2012 at 11:29:35AM -0800, Stephen Warren wrote:
>>> Dmitry Torokhov wrote at Tuesday, January 31, 2012 12:09 PM:
>>>> On Thu, Dec 29, 2011 at 07:25:59PM -0800, Dmitry Torokhov wrote:
>>>>> 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@gmail.com
>>>>>>>>> Cc: rydberg@euromail.se; Stephen Warren; Rakesh Iyer;
>>>>>>>>> linux-kernel@vger.kernel.org; linux- input@vger.kernel.org;
>>>>>>>>> linux-tegra@vger.kernel.org; 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@nvidia.com>
>>>>>>>> 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@nvidia.com>
>>>>>>> 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?
>>>> *ping*
>>> That's conceptually fine by me. I was assuming you were asking Rakesh...
>> Everyone... Anyone ;)
>>
>>> I'd rather PIN_CFG_IGNORE was the first enum, so it gets value 0, or
>>> this
>>> probably won't solve the original issue?
>> The benefit of current definition is that it is compatible with old
>> ones using bool...
>>
>> Thanks.
> Sorry for delay in response.
> I am OK with new definition. Agree, makes compatible with old definitions.
> Thanks!

Which new definition; the one in Dmitry's patch, or what I proposed
above? Note that from what I recall, Dmitry's patch doesn't solve the
problem.

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

[Stephen Warren]

On 03/27/2012 09:22 AM, Stephen Warren wrote:
> On 03/26/2012 11:17 PM, Shridhar Rasal wrote:
>> On 02/01/2012 01:17 AM, Dmitry Torokhov wrote:
>>> On Tue, Jan 31, 2012 at 11:29:35AM -0800, Stephen Warren wrote:
...
>>>> I'd rather PIN_CFG_IGNORE was the first enum, so it gets value 0, or
>>>> this probably won't solve the original issue?
>>>
>>> The benefit of current definition is that it is compatible with old
>>> ones using bool...
>>>
>>> Thanks.
>>
>> Sorry for delay in response.
>> I am OK with new definition. Agree, makes compatible with old definitions.
>> Thanks!
> 
> Which new definition; the one in Dmitry's patch, or what I proposed
> above? Note that from what I recall, Dmitry's patch doesn't solve the
> problem.

Nevermind, I see this patch has been modified to address my concerns,
and already applied.