From patchwork Tue Jun 11 11:31:04 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sebastian Andrzej Siewior X-Patchwork-Id: 2702781 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 34D9F40077 for ; Tue, 11 Jun 2013 11:44:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755349Ab3FKLlS (ORCPT ); Tue, 11 Jun 2013 07:41:18 -0400 Received: from www.linutronix.de ([62.245.132.108]:33573 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755339Ab3FKLlO (ORCPT ); Tue, 11 Jun 2013 07:41:14 -0400 Received: from localhost ([127.0.0.1] helo=localhost.localdomain) by Galois.linutronix.de with esmtp (Exim 4.72) (envelope-from ) id 1UmMns-0003kS-Pa; Tue, 11 Jun 2013 13:31:57 +0200 From: Sebastian Andrzej Siewior To: Lee Jones , Samuel Ortiz Cc: =?UTF-8?q?Beno=C3=AEt=20Cousson?= , Tony Lindgren , Jonathan Cameron , Dmitry Torokhov , Felipe Balbi , linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-iio@vger.kernel.org, linux-input@vger.kernel.org, Sebastian Andrzej Siewior Subject: =?UTF-8?q?=5BPATCH=2018/22=5D=20input/ti=5Fam335x=5Fadc=3A=20use=20only=20FIFO0=20and=20clean=20up=20a=20little?= Date: Tue, 11 Jun 2013 13:31:04 +0200 Message-Id: <1370950268-7224-19-git-send-email-bigeasy@linutronix.de> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1370950268-7224-1-git-send-email-bigeasy@linutronix.de> References: <1370950268-7224-1-git-send-email-bigeasy@linutronix.de> MIME-Version: 1.0 X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1, SHORTCIRCUIT=-0.0001 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org The driver programs a threshold of "coordinate_readouts" say 5. The REG_FIFO0THR registers says it should it be programmed to "threshold minus one". The driver does not expect just 5 coordinates but 5 * 2 + 2. Multiplied by two because 5 for X and 5 for Y and plus 2 because we have two Z. The whole thing kind of works because It reads the 5 coordinates for X and Y from FIFO0 and FIFO1 and the last element in each FIFO is ignored within the loop and read later. Nothing guaranties that FIFO1 is ready by the time it is read. In fact I could see that that FIFO1 reaturns for Y channels 8,9, 10, 12, 6 and for Y channel 7 for Z. The problem is that channel 7 and channel 12 got somehow mixed up. The other Problem is that FIFO1 is also used by the IIO part leading to wrong results if both (tsc & adc) are used. The patch tries to clean up the whole thing a little: - Remove the +1 and -1 in REG_STEPCONFIG, REG_STEPDELAY and its counter part in the for loop. This is just confusing. - Use only FIFO0 in TSC. The fifo has space for 64 entries so should be fine. - Read the whole FIFO in one function and check the channel. - in case we dawdle around, make sure we only read a multiple of our coordinate set. On the second interrupt we will cleanup the remaining enties. Acked-by: Dmitry Torokhov Signed-off-by: Sebastian Andrzej Siewior --- drivers/iio/adc/ti_am335x_adc.c | 2 +- drivers/input/touchscreen/ti_am335x_tsc.c | 78 +++++++++++++++-------------- include/linux/mfd/ti_am335x_tscadc.h | 4 +- 3 files changed, 44 insertions(+), 40 deletions(-) diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c index 4bec91e..307a7c0 100644 --- a/drivers/iio/adc/ti_am335x_adc.c +++ b/drivers/iio/adc/ti_am335x_adc.c @@ -75,7 +75,7 @@ static void tiadc_step_config(struct tiadc_device *adc_dev) stepconfig = STEPCONFIG_AVG_16 | STEPCONFIG_FIFO1; - for (i = (steps + 1); i <= TOTAL_STEPS; i++) { + for (i = steps; i < TOTAL_STEPS; i++) { tiadc_writel(adc_dev, REG_STEPCONFIG(i), stepconfig | STEPCONFIG_INP(channels)); tiadc_writel(adc_dev, REG_STEPDELAY(i), diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c index d6643cb..29febe9 100644 --- a/drivers/input/touchscreen/ti_am335x_tsc.c +++ b/drivers/input/touchscreen/ti_am335x_tsc.c @@ -120,11 +120,9 @@ static int titsc_config_wires(struct titsc *ts_dev) static void titsc_step_config(struct titsc *ts_dev) { unsigned int config; - unsigned int stepenable = 0; - int i, total_steps; - - /* Configure the Step registers */ - total_steps = 2 * ts_dev->coordinate_readouts; + int i; + int end_step; + u32 stepenable; config = STEPCONFIG_MODE_HWSYNC | STEPCONFIG_AVG_16 | ts_dev->bit_xp; @@ -142,7 +140,9 @@ static void titsc_step_config(struct titsc *ts_dev) break; } - for (i = 1; i <= ts_dev->coordinate_readouts; i++) { + /* 1 … coordinate_readouts is for X */ + end_step = ts_dev->coordinate_readouts; + for (i = 0; i < end_step; i++) { titsc_writel(ts_dev, REG_STEPCONFIG(i), config); titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); } @@ -150,7 +150,7 @@ static void titsc_step_config(struct titsc *ts_dev) config = 0; config = STEPCONFIG_MODE_HWSYNC | STEPCONFIG_AVG_16 | ts_dev->bit_yn | - STEPCONFIG_INM_ADCREFM | STEPCONFIG_FIFO1; + STEPCONFIG_INM_ADCREFM; switch (ts_dev->wires) { case 4: config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp); @@ -164,12 +164,13 @@ static void titsc_step_config(struct titsc *ts_dev) break; } - for (i = (ts_dev->coordinate_readouts + 1); i <= total_steps; i++) { + /* coordinate_readouts … coordinate_readouts * 2 is for Y */ + end_step = ts_dev->coordinate_readouts * 2; + for (i = ts_dev->coordinate_readouts; i < end_step; i++) { titsc_writel(ts_dev, REG_STEPCONFIG(i), config); titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); } - config = 0; /* Charge step configuration */ config = ts_dev->bit_xp | ts_dev->bit_yn | STEPCHARGE_RFP_XPUL | STEPCHARGE_RFM_XNUR | @@ -178,35 +179,39 @@ static void titsc_step_config(struct titsc *ts_dev) titsc_writel(ts_dev, REG_CHARGECONFIG, config); titsc_writel(ts_dev, REG_CHARGEDELAY, CHARGEDLY_OPENDLY); - config = 0; - /* Configure to calculate pressure */ + /* coordinate_readouts * 2 … coordinate_readouts * 2 + 2 is for Z */ config = STEPCONFIG_MODE_HWSYNC | STEPCONFIG_AVG_16 | ts_dev->bit_yp | ts_dev->bit_xn | STEPCONFIG_INM_ADCREFM | STEPCONFIG_INP(ts_dev->inp_xp); - titsc_writel(ts_dev, REG_STEPCONFIG(total_steps + 1), config); - titsc_writel(ts_dev, REG_STEPDELAY(total_steps + 1), + titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config); + titsc_writel(ts_dev, REG_STEPDELAY(end_step), STEPCONFIG_OPENDLY); - config |= STEPCONFIG_INP(ts_dev->inp_yn) | STEPCONFIG_FIFO1; - titsc_writel(ts_dev, REG_STEPCONFIG(total_steps + 2), config); - titsc_writel(ts_dev, REG_STEPDELAY(total_steps + 2), + end_step++; + config |= STEPCONFIG_INP(ts_dev->inp_yn); + titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config); + titsc_writel(ts_dev, REG_STEPDELAY(end_step), STEPCONFIG_OPENDLY); /* The steps1 … end and bit 0 for TS_Charge */ - stepenable = (1 << (total_steps + 2)) - 1; + stepenable = (1 << (end_step + 2)) - 1; am335x_tsc_se_set(ts_dev->mfd_tscadc, stepenable); } static void titsc_read_coordinates(struct titsc *ts_dev, - unsigned int *x, unsigned int *y) + u32 *x, u32 *y, u32 *z1, u32 *z2) { unsigned int fifocount = titsc_readl(ts_dev, REG_FIFO0CNT); unsigned int prev_val_x = ~0, prev_val_y = ~0; unsigned int prev_diff_x = ~0, prev_diff_y = ~0; unsigned int read, diff; unsigned int i, channel; + unsigned int creads = ts_dev->coordinate_readouts; + *z1 = *z2 = 0; + if (fifocount % (creads * 2 + 2)) + fifocount -= fifocount % (creads * 2 + 2); /* * Delta filter is used to remove large variations in sampled * values from ADC. The filter tries to predict where the next @@ -215,32 +220,32 @@ static void titsc_read_coordinates(struct titsc *ts_dev, * algorithm compares the difference with that of a present value, * if true the value is reported to the sub system. */ - for (i = 0; i < fifocount - 1; i++) { + for (i = 0; i < fifocount; i++) { read = titsc_readl(ts_dev, REG_FIFO0); - channel = read & 0xf0000; - channel = channel >> 0x10; - if ((channel >= 0) && (channel < ts_dev->coordinate_readouts)) { - read &= 0xfff; + + channel = (read & 0xf0000) >> 16; + read &= 0xfff; + if (channel < creads) { diff = abs(read - prev_val_x); if (diff < prev_diff_x) { prev_diff_x = diff; *x = read; } prev_val_x = read; - } - read = titsc_readl(ts_dev, REG_FIFO1); - channel = read & 0xf0000; - channel = channel >> 0x10; - if ((channel >= ts_dev->coordinate_readouts) && - (channel < (2 * ts_dev->coordinate_readouts - 1))) { - read &= 0xfff; + } else if (channel < creads * 2) { diff = abs(read - prev_val_y); if (diff < prev_diff_y) { prev_diff_y = diff; *y = read; } prev_val_y = read; + + } else if (channel < creads * 2 + 1) { + *z1 = read; + + } else if (channel < creads * 2 + 2) { + *z2 = read; } } } @@ -256,10 +261,8 @@ static irqreturn_t titsc_irq(int irq, void *dev) status = titsc_readl(ts_dev, REG_IRQSTATUS); if (status & IRQENB_FIFO0THRES) { - titsc_read_coordinates(ts_dev, &x, &y); - z1 = titsc_readl(ts_dev, REG_FIFO0) & 0xfff; - z2 = titsc_readl(ts_dev, REG_FIFO1) & 0xfff; + titsc_read_coordinates(ts_dev, &x, &y, &z1, &z2); if (ts_dev->pen_down && z1 != 0 && z2 != 0) { /* @@ -267,10 +270,10 @@ static irqreturn_t titsc_irq(int irq, void *dev) * Resistance(touch) = x plate resistance * * x postion/4096 * ((z2 / z1) - 1) */ - z = z2 - z1; + z = z1 - z2; z *= x; z *= ts_dev->x_plate_resistance; - z /= z1; + z /= z2; z = (z + 2047) >> 12; if (z <= MAX_12BIT) { @@ -391,7 +394,8 @@ static int titsc_probe(struct platform_device *pdev) goto err_free_irq; } titsc_step_config(ts_dev); - titsc_writel(ts_dev, REG_FIFO0THR, ts_dev->coordinate_readouts); + titsc_writel(ts_dev, REG_FIFO0THR, + ts_dev->coordinate_readouts * 2 + 2 - 1); input_dev->name = "ti-tsc"; input_dev->dev.parent = &pdev->dev; @@ -468,7 +472,7 @@ static int titsc_resume(struct device *dev) } titsc_step_config(ts_dev); titsc_writel(ts_dev, REG_FIFO0THR, - ts_dev->coordinate_readouts); + ts_dev->coordinate_readouts * 2 + 2 - 1); return 0; } diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h index cd8686b..fe6223c 100644 --- a/include/linux/mfd/ti_am335x_tscadc.h +++ b/include/linux/mfd/ti_am335x_tscadc.h @@ -30,8 +30,8 @@ #define REG_IDLECONFIG 0x058 #define REG_CHARGECONFIG 0x05C #define REG_CHARGEDELAY 0x060 -#define REG_STEPCONFIG(n) (0x64 + ((n - 1) * 8)) -#define REG_STEPDELAY(n) (0x68 + ((n - 1) * 8)) +#define REG_STEPCONFIG(n) (0x64 + ((n) * 8)) +#define REG_STEPDELAY(n) (0x68 + ((n) * 8)) #define REG_FIFO0CNT 0xE4 #define REG_FIFO0THR 0xE8 #define REG_FIFO1CNT 0xF0