summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorNicolas Ferre <nicolas.ferre@atmel.com>2009-11-19 09:29:32 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2009-11-20 00:55:21 -0800
commit970435a141b55b2334c6b7e834ed5da7a87daae5 (patch)
tree943db1fbd44ab0ff30cc75dcf659248b6a84142f
parentab9122cd3377c9eee85380ea2fe35125c6962a87 (diff)
downloadblackbird-op-linux-970435a141b55b2334c6b7e834ed5da7a87daae5.tar.gz
blackbird-op-linux-970435a141b55b2334c6b7e834ed5da7a87daae5.zip
Input: atmel_tsadcc - use platform parameters
Add a number of plafrom dependent parameters to atmel_tsadcc. The touchscreeen driver can now take into account the slight differences that exist between IPs included in diferent products. This will also allow to adapt its behaivior to the caracteristics of the resistive panel used. Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
-rw-r--r--drivers/input/touchscreen/atmel_tsadcc.c41
1 files changed, 35 insertions, 6 deletions
diff --git a/drivers/input/touchscreen/atmel_tsadcc.c b/drivers/input/touchscreen/atmel_tsadcc.c
index 5a2af5973cb4..3d9b5166ebe9 100644
--- a/drivers/input/touchscreen/atmel_tsadcc.c
+++ b/drivers/input/touchscreen/atmel_tsadcc.c
@@ -22,6 +22,8 @@
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/io.h>
+#include <mach/board.h>
+#include <mach/cpu.h>
/* Register definitions based on AT91SAM9RL64 preliminary draft datasheet */
@@ -36,7 +38,9 @@
#define ATMEL_TSADCC_LOWRES (1 << 4) /* Resolution selection */
#define ATMEL_TSADCC_SLEEP (1 << 5) /* Sleep mode */
#define ATMEL_TSADCC_PENDET (1 << 6) /* Pen Detect selection */
+#define ATMEL_TSADCC_PRES (1 << 7) /* Pressure Measurement Selection */
#define ATMEL_TSADCC_PRESCAL (0x3f << 8) /* Prescalar Rate Selection */
+#define ATMEL_TSADCC_EPRESCAL (0xff << 8) /* Prescalar Rate Selection (Extended) */
#define ATMEL_TSADCC_STARTUP (0x7f << 16) /* Start Up time */
#define ATMEL_TSADCC_SHTIM (0xf << 24) /* Sample & Hold time */
#define ATMEL_TSADCC_PENDBC (0xf << 28) /* Pen Detect debouncing time */
@@ -84,7 +88,13 @@
#define ATMEL_TSADCC_CDR4 0x40 /* Channel Data 4 */
#define ATMEL_TSADCC_CDR5 0x44 /* Channel Data 5 */
-#define ADC_CLOCK 1000000
+#define ATMEL_TSADCC_XPOS 0x50
+#define ATMEL_TSADCC_Z1DAT 0x54
+#define ATMEL_TSADCC_Z2DAT 0x58
+
+#define PRESCALER_VAL(x) ((x) >> 8)
+
+#define ADC_DEFAULT_CLOCK 100000
struct atmel_tsadcc {
struct input_dev *input;
@@ -172,6 +182,7 @@ static int __devinit atmel_tsadcc_probe(struct platform_device *pdev)
struct atmel_tsadcc *ts_dev;
struct input_dev *input_dev;
struct resource *res;
+ struct at91_tsadcc_data *pdata = pdev->dev.platform_data;
int err = 0;
unsigned int prsc;
unsigned int reg;
@@ -254,19 +265,37 @@ static int __devinit atmel_tsadcc_probe(struct platform_device *pdev)
prsc = clk_get_rate(ts_dev->clk);
dev_info(&pdev->dev, "Master clock is set at: %d Hz\n", prsc);
- prsc = prsc / ADC_CLOCK / 2 - 1;
+ if (!pdata)
+ goto err_fail;
+
+ if (!pdata->adc_clock)
+ pdata->adc_clock = ADC_DEFAULT_CLOCK;
+
+ prsc = (prsc / (2 * pdata->adc_clock)) - 1;
+
+ /* saturate if this value is too high */
+ if (cpu_is_at91sam9rl()) {
+ if (prsc > PRESCALER_VAL(ATMEL_TSADCC_PRESCAL))
+ prsc = PRESCALER_VAL(ATMEL_TSADCC_PRESCAL);
+ } else {
+ if (prsc > PRESCALER_VAL(ATMEL_TSADCC_EPRESCAL))
+ prsc = PRESCALER_VAL(ATMEL_TSADCC_EPRESCAL);
+ }
+
+ dev_info(&pdev->dev, "Prescaler is set at: %d\n", prsc);
reg = ATMEL_TSADCC_TSAMOD_TS_ONLY_MODE |
((0x00 << 5) & ATMEL_TSADCC_SLEEP) | /* Normal Mode */
((0x01 << 6) & ATMEL_TSADCC_PENDET) | /* Enable Pen Detect */
- ((prsc << 8) & ATMEL_TSADCC_PRESCAL) | /* PRESCAL */
- ((0x13 << 16) & ATMEL_TSADCC_STARTUP) | /* STARTUP */
- ((0x0F << 28) & ATMEL_TSADCC_PENDBC); /* PENDBC */
+ (prsc << 8) |
+ ((0x26 << 16) & ATMEL_TSADCC_STARTUP) |
+ ((pdata->pendet_debounce << 28) & ATMEL_TSADCC_PENDBC);
atmel_tsadcc_write(ATMEL_TSADCC_CR, ATMEL_TSADCC_SWRST);
atmel_tsadcc_write(ATMEL_TSADCC_MR, reg);
atmel_tsadcc_write(ATMEL_TSADCC_TRGR, ATMEL_TSADCC_TRGMOD_NONE);
- atmel_tsadcc_write(ATMEL_TSADCC_TSR, (0x3 << 24) & ATMEL_TSADCC_TSSHTIM);
+ atmel_tsadcc_write(ATMEL_TSADCC_TSR,
+ (pdata->ts_sample_hold_time << 24) & ATMEL_TSADCC_TSSHTIM);
atmel_tsadcc_read(ATMEL_TSADCC_SR);
atmel_tsadcc_write(ATMEL_TSADCC_IER, ATMEL_TSADCC_PENCNT);
OpenPOWER on IntegriCloud