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@xxxxxxxxx>
---
drivers/input/touchscreen/atmel_tsadcc.c | 41 +++++++++++++++++++++++++----
1 files changed, 35 insertions(+), 6 deletions(-)
diff --git a/drivers/input/touchscreen/atmel_tsadcc.c b/drivers/input/touchscreen/atmel_tsadcc.c
index 5a2af59..3d9b516 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);
--
1.5.6.5
--
To unsubscribe from this list: send the line "unsubscribe linux-input" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
