Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755322Ab2JPHmc (ORCPT ); Tue, 16 Oct 2012 03:42:32 -0400 Received: from bear.ext.ti.com ([192.94.94.41]:35674 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754761Ab2JPHm0 (ORCPT ); Tue, 16 Oct 2012 03:42:26 -0400 From: "Patil, Rachna" To: , , CC: Samuel Ortiz , Dmitry Torokhov , Dmitry Torokhov , Jonathan Cameron , "Patil, Rachna" Subject: [PATCH RESEND 2/8] input: TSC: ti_tscadc: Add Step configuration as platform data Date: Tue, 16 Oct 2012 12:55:39 +0530 Message-ID: <1350372345-27108-3-git-send-email-rachna@ti.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1350372345-27108-1-git-send-email-rachna@ti.com> References: <1350372345-27108-1-git-send-email-rachna@ti.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5023 Lines: 140 There are 16 programmable Step Configuration registers which are used by the sequencer. Program the Steps in order to configure a channel input to be sampled. If the same step is applied several times, the coordinate values read are more accurate. Hence we provide the user an option of how many steps should be configured. For ex: If this value is assigned as 4, This means that 4 steps are applied to read x co-ordinate and 4 steps to read y co-ordinate. Furtheron the interrupt handler already holds code to use delta filter and report the best value out of these values to the input sub-system. Signed-off-by: Patil, Rachna --- drivers/input/touchscreen/ti_tscadc.c | 25 +++++++++++++------------ include/linux/input/ti_tscadc.h | 6 ++++++ 2 files changed, 19 insertions(+), 12 deletions(-) diff --git a/drivers/input/touchscreen/ti_tscadc.c b/drivers/input/touchscreen/ti_tscadc.c index d198cab..c1bd8e5 100644 --- a/drivers/input/touchscreen/ti_tscadc.c +++ b/drivers/input/touchscreen/ti_tscadc.c @@ -41,10 +41,6 @@ #define REG_CHARGEDELAY 0x060 #define REG_STEPCONFIG(n) (0x64 + ((n - 1) * 8)) #define REG_STEPDELAY(n) (0x68 + ((n - 1) * 8)) -#define REG_STEPCONFIG13 0x0C4 -#define REG_STEPDELAY13 0x0C8 -#define REG_STEPCONFIG14 0x0CC -#define REG_STEPDELAY14 0x0D0 #define REG_FIFO0CNT 0xE4 #define REG_FIFO1THR 0xF4 #define REG_FIFO0 0x100 @@ -134,6 +130,7 @@ struct tscadc { unsigned int wires; unsigned int x_plate_resistance; bool pen_down; + int steps_to_configure; }; static unsigned int tscadc_readl(struct tscadc *ts, unsigned int reg) @@ -150,9 +147,10 @@ static void tscadc_writel(struct tscadc *tsc, unsigned int reg, static void tscadc_step_config(struct tscadc *ts_dev) { unsigned int config; - int i; + int i, total_steps; /* Configure the Step registers */ + total_steps = 2 * ts_dev->steps_to_configure; config = STEPCONFIG_MODE_HWSYNC | STEPCONFIG_AVG_16 | STEPCONFIG_XPP; @@ -170,7 +168,7 @@ static void tscadc_step_config(struct tscadc *ts_dev) break; } - for (i = 1; i < 7; i++) { + for (i = 1; i <= ts_dev->steps_to_configure; i++) { tscadc_writel(ts_dev, REG_STEPCONFIG(i), config); tscadc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); } @@ -192,7 +190,7 @@ static void tscadc_step_config(struct tscadc *ts_dev) break; } - for (i = 7; i < 13; i++) { + for (i = (ts_dev->steps_to_configure + 1); i <= total_steps; i++) { tscadc_writel(ts_dev, REG_STEPCONFIG(i), config); tscadc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); } @@ -211,12 +209,14 @@ static void tscadc_step_config(struct tscadc *ts_dev) config = STEPCONFIG_MODE_HWSYNC | STEPCONFIG_AVG_16 | STEPCONFIG_YPP | STEPCONFIG_XNN | STEPCONFIG_INM_ADCREFM; - tscadc_writel(ts_dev, REG_STEPCONFIG13, config); - tscadc_writel(ts_dev, REG_STEPDELAY13, STEPCONFIG_OPENDLY); + tscadc_writel(ts_dev, REG_STEPCONFIG(total_steps + 1), config); + tscadc_writel(ts_dev, REG_STEPDELAY(total_steps + 1), + STEPCONFIG_OPENDLY); config |= STEPCONFIG_INP_AN3 | STEPCONFIG_FIFO1; - tscadc_writel(ts_dev, REG_STEPCONFIG14, config); - tscadc_writel(ts_dev, REG_STEPDELAY14, STEPCONFIG_OPENDLY); + tscadc_writel(ts_dev, REG_STEPCONFIG(total_steps + 2), config); + tscadc_writel(ts_dev, REG_STEPDELAY(total_steps + 2), + STEPCONFIG_OPENDLY); tscadc_writel(ts_dev, REG_SE, STPENB_STEPENB); } @@ -379,6 +379,7 @@ static int __devinit tscadc_probe(struct platform_device *pdev) ts_dev->irq = irq; ts_dev->wires = pdata->wires; ts_dev->x_plate_resistance = pdata->x_plate_resistance; + ts_dev->steps_to_configure = pdata->steps_to_configure; res = request_mem_region(res->start, resource_size(res), pdev->name); if (!res) { @@ -447,7 +448,7 @@ static int __devinit tscadc_probe(struct platform_device *pdev) tscadc_idle_config(ts_dev); tscadc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO1THRES); tscadc_step_config(ts_dev); - tscadc_writel(ts_dev, REG_FIFO1THR, 6); + tscadc_writel(ts_dev, REG_FIFO1THR, ts_dev->steps_to_configure); ctrl |= CNTRLREG_TSCSSENB; tscadc_writel(ts_dev, REG_CTRL, ctrl); diff --git a/include/linux/input/ti_tscadc.h b/include/linux/input/ti_tscadc.h index b10a527..ad442a3 100644 --- a/include/linux/input/ti_tscadc.h +++ b/include/linux/input/ti_tscadc.h @@ -7,11 +7,17 @@ * i.e. 4/5/8 wire touchscreen support * on the platform. * @x_plate_resistance: X plate resistance. + * @steps_to_configure: The sequencer supports a total of + * 16 programmable steps. + * A step configured to read a single + * co-ordinate value, can be applied + * more number of times for better results. */ struct tsc_data { int wires; int x_plate_resistance; + int steps_to_configure; }; #endif -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/