diff options
Diffstat (limited to 'drivers/input/touchscreen/atmel_tsadcc.c')
| -rw-r--r-- | 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 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); |