+++ /dev/null
-/*
- * Atmel Touch Screen Driver
- *
- * Copyright (c) 2008 ATMEL
- * Copyright (c) 2008 Dan Liang
- * Copyright (c) 2008 TimeSys Corporation
- * Copyright (c) 2008 Justin Waters
- *
- * Based on touchscreen code from Atmel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#include <linux/err.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/input.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/clk.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <linux/platform_data/atmel.h>
-#include <mach/cpu.h>
-
-/* Register definitions based on AT91SAM9RL64 preliminary draft datasheet */
-
-#define ATMEL_TSADCC_CR 0x00 /* Control register */
-#define ATMEL_TSADCC_SWRST (1 << 0) /* Software Reset*/
-#define ATMEL_TSADCC_START (1 << 1) /* Start conversion */
-
-#define ATMEL_TSADCC_MR 0x04 /* Mode register */
-#define ATMEL_TSADCC_TSAMOD (3 << 0) /* ADC mode */
-#define ATMEL_TSADCC_TSAMOD_ADC_ONLY_MODE (0x0) /* ADC Mode */
-#define ATMEL_TSADCC_TSAMOD_TS_ONLY_MODE (0x1) /* Touch Screen Only Mode */
-#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 */
-
-#define ATMEL_TSADCC_TRGR 0x08 /* Trigger register */
-#define ATMEL_TSADCC_TRGMOD (7 << 0) /* Trigger mode */
-#define ATMEL_TSADCC_TRGMOD_NONE (0 << 0)
-#define ATMEL_TSADCC_TRGMOD_EXT_RISING (1 << 0)
-#define ATMEL_TSADCC_TRGMOD_EXT_FALLING (2 << 0)
-#define ATMEL_TSADCC_TRGMOD_EXT_ANY (3 << 0)
-#define ATMEL_TSADCC_TRGMOD_PENDET (4 << 0)
-#define ATMEL_TSADCC_TRGMOD_PERIOD (5 << 0)
-#define ATMEL_TSADCC_TRGMOD_CONTINUOUS (6 << 0)
-#define ATMEL_TSADCC_TRGPER (0xffff << 16) /* Trigger period */
-
-#define ATMEL_TSADCC_TSR 0x0C /* Touch Screen register */
-#define ATMEL_TSADCC_TSFREQ (0xf << 0) /* TS Frequency in Interleaved mode */
-#define ATMEL_TSADCC_TSSHTIM (0xf << 24) /* Sample & Hold time */
-
-#define ATMEL_TSADCC_CHER 0x10 /* Channel Enable register */
-#define ATMEL_TSADCC_CHDR 0x14 /* Channel Disable register */
-#define ATMEL_TSADCC_CHSR 0x18 /* Channel Status register */
-#define ATMEL_TSADCC_CH(n) (1 << (n)) /* Channel number */
-
-#define ATMEL_TSADCC_SR 0x1C /* Status register */
-#define ATMEL_TSADCC_EOC(n) (1 << ((n)+0)) /* End of conversion for channel N */
-#define ATMEL_TSADCC_OVRE(n) (1 << ((n)+8)) /* Overrun error for channel N */
-#define ATMEL_TSADCC_DRDY (1 << 16) /* Data Ready */
-#define ATMEL_TSADCC_GOVRE (1 << 17) /* General Overrun Error */
-#define ATMEL_TSADCC_ENDRX (1 << 18) /* End of RX Buffer */
-#define ATMEL_TSADCC_RXBUFF (1 << 19) /* TX Buffer full */
-#define ATMEL_TSADCC_PENCNT (1 << 20) /* Pen contact */
-#define ATMEL_TSADCC_NOCNT (1 << 21) /* No contact */
-
-#define ATMEL_TSADCC_LCDR 0x20 /* Last Converted Data register */
-#define ATMEL_TSADCC_DATA (0x3ff << 0) /* Channel data */
-
-#define ATMEL_TSADCC_IER 0x24 /* Interrupt Enable register */
-#define ATMEL_TSADCC_IDR 0x28 /* Interrupt Disable register */
-#define ATMEL_TSADCC_IMR 0x2C /* Interrupt Mask register */
-#define ATMEL_TSADCC_CDR0 0x30 /* Channel Data 0 */
-#define ATMEL_TSADCC_CDR1 0x34 /* Channel Data 1 */
-#define ATMEL_TSADCC_CDR2 0x38 /* Channel Data 2 */
-#define ATMEL_TSADCC_CDR3 0x3C /* Channel Data 3 */
-#define ATMEL_TSADCC_CDR4 0x40 /* Channel Data 4 */
-#define ATMEL_TSADCC_CDR5 0x44 /* Channel Data 5 */
-
-#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;
- char phys[32];
- struct clk *clk;
- int irq;
- unsigned int prev_absx;
- unsigned int prev_absy;
- unsigned char bufferedmeasure;
-};
-
-static void __iomem *tsc_base;
-
-#define atmel_tsadcc_read(reg) __raw_readl(tsc_base + (reg))
-#define atmel_tsadcc_write(reg, val) __raw_writel((val), tsc_base + (reg))
-
-static irqreturn_t atmel_tsadcc_interrupt(int irq, void *dev)
-{
- struct atmel_tsadcc *ts_dev = (struct atmel_tsadcc *)dev;
- struct input_dev *input_dev = ts_dev->input;
-
- unsigned int status;
- unsigned int reg;
-
- status = atmel_tsadcc_read(ATMEL_TSADCC_SR);
- status &= atmel_tsadcc_read(ATMEL_TSADCC_IMR);
-
- if (status & ATMEL_TSADCC_NOCNT) {
- /* Contact lost */
- reg = atmel_tsadcc_read(ATMEL_TSADCC_MR) | ATMEL_TSADCC_PENDBC;
-
- atmel_tsadcc_write(ATMEL_TSADCC_MR, reg);
- atmel_tsadcc_write(ATMEL_TSADCC_TRGR, ATMEL_TSADCC_TRGMOD_NONE);
- atmel_tsadcc_write(ATMEL_TSADCC_IDR,
- ATMEL_TSADCC_EOC(3) | ATMEL_TSADCC_NOCNT);
- atmel_tsadcc_write(ATMEL_TSADCC_IER, ATMEL_TSADCC_PENCNT);
-
- input_report_key(input_dev, BTN_TOUCH, 0);
- ts_dev->bufferedmeasure = 0;
- input_sync(input_dev);
-
- } else if (status & ATMEL_TSADCC_PENCNT) {
- /* Pen detected */
- reg = atmel_tsadcc_read(ATMEL_TSADCC_MR);
- reg &= ~ATMEL_TSADCC_PENDBC;
-
- atmel_tsadcc_write(ATMEL_TSADCC_IDR, ATMEL_TSADCC_PENCNT);
- atmel_tsadcc_write(ATMEL_TSADCC_MR, reg);
- atmel_tsadcc_write(ATMEL_TSADCC_IER,
- ATMEL_TSADCC_EOC(3) | ATMEL_TSADCC_NOCNT);
- atmel_tsadcc_write(ATMEL_TSADCC_TRGR,
- ATMEL_TSADCC_TRGMOD_PERIOD | (0x0FFF << 16));
-
- } else if (status & ATMEL_TSADCC_EOC(3)) {
- /* Conversion finished */
-
- if (ts_dev->bufferedmeasure) {
- /* Last measurement is always discarded, since it can
- * be erroneous.
- * Always report previous measurement */
- input_report_abs(input_dev, ABS_X, ts_dev->prev_absx);
- input_report_abs(input_dev, ABS_Y, ts_dev->prev_absy);
- input_report_key(input_dev, BTN_TOUCH, 1);
- input_sync(input_dev);
- } else
- ts_dev->bufferedmeasure = 1;
-
- /* Now make new measurement */
- ts_dev->prev_absx = atmel_tsadcc_read(ATMEL_TSADCC_CDR3) << 10;
- ts_dev->prev_absx /= atmel_tsadcc_read(ATMEL_TSADCC_CDR2);
-
- ts_dev->prev_absy = atmel_tsadcc_read(ATMEL_TSADCC_CDR1) << 10;
- ts_dev->prev_absy /= atmel_tsadcc_read(ATMEL_TSADCC_CDR0);
- }
-
- return IRQ_HANDLED;
-}
-
-/*
- * The functions for inserting/removing us as a module.
- */
-
-static int 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 = dev_get_platdata(&pdev->dev);
- int err;
- unsigned int prsc;
- unsigned int reg;
-
- if (!pdata)
- return -EINVAL;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(&pdev->dev, "no mmio resource defined.\n");
- return -ENXIO;
- }
-
- /* Allocate memory for device */
- ts_dev = kzalloc(sizeof(struct atmel_tsadcc), GFP_KERNEL);
- if (!ts_dev) {
- dev_err(&pdev->dev, "failed to allocate memory.\n");
- return -ENOMEM;
- }
- platform_set_drvdata(pdev, ts_dev);
-
- input_dev = input_allocate_device();
- if (!input_dev) {
- dev_err(&pdev->dev, "failed to allocate input device.\n");
- err = -EBUSY;
- goto err_free_mem;
- }
-
- ts_dev->irq = platform_get_irq(pdev, 0);
- if (ts_dev->irq < 0) {
- dev_err(&pdev->dev, "no irq ID is designated.\n");
- err = -ENODEV;
- goto err_free_dev;
- }
-
- if (!request_mem_region(res->start, resource_size(res),
- "atmel tsadcc regs")) {
- dev_err(&pdev->dev, "resources is unavailable.\n");
- err = -EBUSY;
- goto err_free_dev;
- }
-
- tsc_base = ioremap(res->start, resource_size(res));
- if (!tsc_base) {
- dev_err(&pdev->dev, "failed to map registers.\n");
- err = -ENOMEM;
- goto err_release_mem;
- }
-
- err = request_irq(ts_dev->irq, atmel_tsadcc_interrupt, 0,
- pdev->dev.driver->name, ts_dev);
- if (err) {
- dev_err(&pdev->dev, "failed to allocate irq.\n");
- goto err_unmap_regs;
- }
-
- ts_dev->clk = clk_get(&pdev->dev, "tsc_clk");
- if (IS_ERR(ts_dev->clk)) {
- dev_err(&pdev->dev, "failed to get ts_clk\n");
- err = PTR_ERR(ts_dev->clk);
- goto err_free_irq;
- }
-
- ts_dev->input = input_dev;
- ts_dev->bufferedmeasure = 0;
-
- snprintf(ts_dev->phys, sizeof(ts_dev->phys),
- "%s/input0", dev_name(&pdev->dev));
-
- input_dev->name = "atmel touch screen controller";
- input_dev->phys = ts_dev->phys;
- input_dev->dev.parent = &pdev->dev;
-
- __set_bit(EV_ABS, input_dev->evbit);
- input_set_abs_params(input_dev, ABS_X, 0, 0x3FF, 0, 0);
- input_set_abs_params(input_dev, ABS_Y, 0, 0x3FF, 0, 0);
-
- input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
-
- /* clk_enable() always returns 0, no need to check it */
- clk_enable(ts_dev->clk);
-
- prsc = clk_get_rate(ts_dev->clk);
- dev_info(&pdev->dev, "Master clock is set at: %d Hz\n", prsc);
-
- 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) |
- ((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,
- (pdata->ts_sample_hold_time << 24) & ATMEL_TSADCC_TSSHTIM);
-
- atmel_tsadcc_read(ATMEL_TSADCC_SR);
- atmel_tsadcc_write(ATMEL_TSADCC_IER, ATMEL_TSADCC_PENCNT);
-
- /* All went ok, so register to the input system */
- err = input_register_device(input_dev);
- if (err)
- goto err_fail;
-
- return 0;
-
-err_fail:
- clk_disable(ts_dev->clk);
- clk_put(ts_dev->clk);
-err_free_irq:
- free_irq(ts_dev->irq, ts_dev);
-err_unmap_regs:
- iounmap(tsc_base);
-err_release_mem:
- release_mem_region(res->start, resource_size(res));
-err_free_dev:
- input_free_device(input_dev);
-err_free_mem:
- kfree(ts_dev);
- return err;
-}
-
-static int atmel_tsadcc_remove(struct platform_device *pdev)
-{
- struct atmel_tsadcc *ts_dev = platform_get_drvdata(pdev);
- struct resource *res;
-
- free_irq(ts_dev->irq, ts_dev);
-
- input_unregister_device(ts_dev->input);
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- iounmap(tsc_base);
- release_mem_region(res->start, resource_size(res));
-
- clk_disable(ts_dev->clk);
- clk_put(ts_dev->clk);
-
- kfree(ts_dev);
-
- return 0;
-}
-
-static struct platform_driver atmel_tsadcc_driver = {
- .probe = atmel_tsadcc_probe,
- .remove = atmel_tsadcc_remove,
- .driver = {
- .name = "atmel_tsadcc",
- },
-};
-module_platform_driver(atmel_tsadcc_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Atmel TouchScreen Driver");
-MODULE_AUTHOR("Dan Liang <dan.liang@atmel.com>");
-
projects / karo-tx-linux.git / commitdiff