diff options
Diffstat (limited to 'drivers/input/touchscreen/atmel_tsadcc.c')
| -rw-r--r-- | drivers/input/touchscreen/atmel_tsadcc.c | 359 |
1 files changed, 0 insertions, 359 deletions
diff --git a/drivers/input/touchscreen/atmel_tsadcc.c b/drivers/input/touchscreen/atmel_tsadcc.c deleted file mode 100644 index bddabc59507..00000000000 --- a/drivers/input/touchscreen/atmel_tsadcc.c +++ /dev/null @@ -1,359 +0,0 @@ -/* - * 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/init.h> -#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 = pdev->dev.platform_data; - 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>"); - |