diff options
Diffstat (limited to 'drivers/input/touchscreen/ti_tscadc.c')
| -rw-r--r-- | drivers/input/touchscreen/ti_tscadc.c | 486 |
1 files changed, 0 insertions, 486 deletions
diff --git a/drivers/input/touchscreen/ti_tscadc.c b/drivers/input/touchscreen/ti_tscadc.c deleted file mode 100644 index d229c74..0000000 --- a/drivers/input/touchscreen/ti_tscadc.c +++ /dev/null @@ -1,486 +0,0 @@ -/* - * TI Touch Screen driver - * - * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation version 2. - * - * This program is distributed "as is" WITHOUT ANY WARRANTY of any - * kind, whether express or implied; without even the implied warranty - * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - - -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/err.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/input/ti_tscadc.h> -#include <linux/delay.h> - -#define REG_IRQEOI 0x020 -#define REG_RAWIRQSTATUS 0x024 -#define REG_IRQSTATUS 0x028 -#define REG_IRQENABLE 0x02C -#define REG_IRQWAKEUP 0x034 -#define REG_CTRL 0x040 -#define REG_ADCFSM 0x044 -#define REG_CLKDIV 0x04C -#define REG_SE 0x054 -#define REG_IDLECONFIG 0x058 -#define REG_CHARGECONFIG 0x05C -#define REG_CHARGEDELAY 0x060 -#define REG_STEPCONFIG(n) (0x64 + ((n - 1) * 8)) -#define REG_STEPDELAY(n) (0x68 + ((n - 1) * 8)) -#define REG_STEPCONFIG13 0x0C4 -#define REG_STEPDELAY13 0x0C8 -#define REG_STEPCONFIG14 0x0CC -#define REG_STEPDELAY14 0x0D0 -#define REG_FIFO0CNT 0xE4 -#define REG_FIFO1THR 0xF4 -#define REG_FIFO0 0x100 -#define REG_FIFO1 0x200 - -/* Register Bitfields */ -#define IRQWKUP_ENB BIT(0) -#define STPENB_STEPENB 0x7FFF -#define IRQENB_FIFO1THRES BIT(5) -#define IRQENB_PENUP BIT(9) -#define STEPCONFIG_MODE_HWSYNC 0x2 -#define STEPCONFIG_SAMPLES_AVG (1 << 4) -#define STEPCONFIG_XPP (1 << 5) -#define STEPCONFIG_XNN (1 << 6) -#define STEPCONFIG_YPP (1 << 7) -#define STEPCONFIG_YNN (1 << 8) -#define STEPCONFIG_XNP (1 << 9) -#define STEPCONFIG_YPN (1 << 10) -#define STEPCONFIG_INM (1 << 18) -#define STEPCONFIG_INP (1 << 20) -#define STEPCONFIG_INP_5 (1 << 21) -#define STEPCONFIG_FIFO1 (1 << 26) -#define STEPCONFIG_OPENDLY 0xff -#define STEPCONFIG_Z1 (3 << 19) -#define STEPIDLE_INP (1 << 22) -#define STEPCHARGE_RFP (1 << 12) -#define STEPCHARGE_INM (1 << 15) -#define STEPCHARGE_INP (1 << 19) -#define STEPCHARGE_RFM (1 << 23) -#define STEPCHARGE_DELAY 0x1 -#define CNTRLREG_TSCSSENB (1 << 0) -#define CNTRLREG_STEPID (1 << 1) -#define CNTRLREG_STEPCONFIGWRT (1 << 2) -#define CNTRLREG_4WIRE (1 << 5) -#define CNTRLREG_5WIRE (1 << 6) -#define CNTRLREG_8WIRE (3 << 5) -#define CNTRLREG_TSCENB (1 << 7) -#define ADCFSM_STEPID 0x10 - -#define SEQ_SETTLE 275 -#define ADC_CLK 3000000 -#define MAX_12BIT ((1 << 12) - 1) -#define TSCADC_DELTA_X 15 -#define TSCADC_DELTA_Y 15 - -struct tscadc { - struct input_dev *input; - struct clk *tsc_ick; - void __iomem *tsc_base; - unsigned int irq; - unsigned int wires; - unsigned int x_plate_resistance; - bool pen_down; -}; - -static unsigned int tscadc_readl(struct tscadc *ts, unsigned int reg) -{ - return readl(ts->tsc_base + reg); -} - -static void tscadc_writel(struct tscadc *tsc, unsigned int reg, - unsigned int val) -{ - writel(val, tsc->tsc_base + reg); -} - -static void tscadc_step_config(struct tscadc *ts_dev) -{ - unsigned int config; - int i; - - /* Configure the Step registers */ - - config = STEPCONFIG_MODE_HWSYNC | - STEPCONFIG_SAMPLES_AVG | STEPCONFIG_XPP; - switch (ts_dev->wires) { - case 4: - config |= STEPCONFIG_INP | STEPCONFIG_XNN; - break; - case 5: - config |= STEPCONFIG_YNN | - STEPCONFIG_INP_5 | STEPCONFIG_XNN | - STEPCONFIG_YPP; - break; - case 8: - config |= STEPCONFIG_INP | STEPCONFIG_XNN; - break; - } - - for (i = 1; i < 7; i++) { - tscadc_writel(ts_dev, REG_STEPCONFIG(i), config); - tscadc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); - } - - config = 0; - config = STEPCONFIG_MODE_HWSYNC | - STEPCONFIG_SAMPLES_AVG | STEPCONFIG_YNN | - STEPCONFIG_INM | STEPCONFIG_FIFO1; - switch (ts_dev->wires) { - case 4: - config |= STEPCONFIG_YPP; - break; - case 5: - config |= STEPCONFIG_XPP | STEPCONFIG_INP_5 | - STEPCONFIG_XNP | STEPCONFIG_YPN; - break; - case 8: - config |= STEPCONFIG_YPP; - break; - } - - for (i = 7; i < 13; i++) { - tscadc_writel(ts_dev, REG_STEPCONFIG(i), config); - tscadc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); - } - - config = 0; - /* Charge step configuration */ - config = STEPCONFIG_XPP | STEPCONFIG_YNN | - STEPCHARGE_RFP | STEPCHARGE_RFM | - STEPCHARGE_INM | STEPCHARGE_INP; - - tscadc_writel(ts_dev, REG_CHARGECONFIG, config); - tscadc_writel(ts_dev, REG_CHARGEDELAY, STEPCHARGE_DELAY); - - config = 0; - /* Configure to calculate pressure */ - config = STEPCONFIG_MODE_HWSYNC | - STEPCONFIG_SAMPLES_AVG | STEPCONFIG_YPP | - STEPCONFIG_XNN | STEPCONFIG_INM; - tscadc_writel(ts_dev, REG_STEPCONFIG13, config); - tscadc_writel(ts_dev, REG_STEPDELAY13, STEPCONFIG_OPENDLY); - - config |= STEPCONFIG_Z1 | STEPCONFIG_FIFO1; - tscadc_writel(ts_dev, REG_STEPCONFIG14, config); - tscadc_writel(ts_dev, REG_STEPDELAY14, STEPCONFIG_OPENDLY); - - tscadc_writel(ts_dev, REG_SE, STPENB_STEPENB); -} - -static void tscadc_idle_config(struct tscadc *ts_config) -{ - unsigned int idleconfig; - - idleconfig = STEPCONFIG_YNN | - STEPCONFIG_INM | - STEPCONFIG_YPN | STEPIDLE_INP; - tscadc_writel(ts_config, REG_IDLECONFIG, idleconfig); -} - -static void tscadc_read_coordinates(struct tscadc *ts_dev, - unsigned int *x, unsigned int *y) -{ - unsigned int fifocount = tscadc_readl(ts_dev, REG_FIFO0CNT); - unsigned int prev_val_x = ~0, prev_val_y = ~0; - unsigned int prev_diff_x = ~0, prev_diff_y = ~0; - unsigned int read, diff; - unsigned int i; - - /* - * Delta filter is used to remove large variations in sampled - * values from ADC. The filter tries to predict where the next - * coordinate could be. This is done by taking a previous - * coordinate and subtracting it form current one. Further the - * algorithm compares the difference with that of a present value, - * if true the value is reported to the sub system. - */ - for (i = 0; i < fifocount - 1; i++) { - read = tscadc_readl(ts_dev, REG_FIFO0) & 0xfff; - diff = abs(read - prev_val_x); - if (diff < prev_diff_x) { - prev_diff_x = diff; - *x = read; - } - prev_val_x = read; - - read = tscadc_readl(ts_dev, REG_FIFO1) & 0xfff; - diff = abs(read - prev_val_y); - if (diff < prev_diff_y) { - prev_diff_y = diff; - *y = read; - } - prev_val_y = read; - } -} - -static irqreturn_t tscadc_irq(int irq, void *dev) -{ - struct tscadc *ts_dev = dev; - struct input_dev *input_dev = ts_dev->input; - unsigned int status, irqclr = 0; - unsigned int x = 0, y = 0; - unsigned int z1, z2, z; - unsigned int fsm; - - status = tscadc_readl(ts_dev, REG_IRQSTATUS); - if (status & IRQENB_FIFO1THRES) { - tscadc_read_coordinates(ts_dev, &x, &y); - - z1 = tscadc_readl(ts_dev, REG_FIFO0) & 0xfff; - z2 = tscadc_readl(ts_dev, REG_FIFO1) & 0xfff; - - if (ts_dev->pen_down && z1 != 0 && z2 != 0) { - /* - * Calculate pressure using formula - * Resistance(touch) = x plate resistance * - * x postion/4096 * ((z2 / z1) - 1) - */ - z = z2 - z1; - z *= x; - z *= ts_dev->x_plate_resistance; - z /= z1; - z = (z + 2047) >> 12; - - if (z <= MAX_12BIT) { - input_report_abs(input_dev, ABS_X, x); - input_report_abs(input_dev, ABS_Y, y); - input_report_abs(input_dev, ABS_PRESSURE, z); - input_report_key(input_dev, BTN_TOUCH, 1); - input_sync(input_dev); - } - } - irqclr |= IRQENB_FIFO1THRES; - } - - /* - * Time for sequencer to settle, to read - * correct state of the sequencer. - */ - udelay(SEQ_SETTLE); - - status = tscadc_readl(ts_dev, REG_RAWIRQSTATUS); - if (status & IRQENB_PENUP) { - /* Pen up event */ - fsm = tscadc_readl(ts_dev, REG_ADCFSM); - if (fsm == ADCFSM_STEPID) { - ts_dev->pen_down = false; - input_report_key(input_dev, BTN_TOUCH, 0); - input_report_abs(input_dev, ABS_PRESSURE, 0); - input_sync(input_dev); - } else { - ts_dev->pen_down = true; - } - irqclr |= IRQENB_PENUP; - } - - tscadc_writel(ts_dev, REG_IRQSTATUS, irqclr); - /* check pending interrupts */ - tscadc_writel(ts_dev, REG_IRQEOI, 0x0); - - tscadc_writel(ts_dev, REG_SE, STPENB_STEPENB); - return IRQ_HANDLED; -} - -/* - * The functions for inserting/removing driver as a module. - */ - -static int __devinit tscadc_probe(struct platform_device *pdev) -{ - const struct tsc_data *pdata = pdev->dev.platform_data; - struct resource *res; - struct tscadc *ts_dev; - struct input_dev *input_dev; - struct clk *clk; - int err; - int clk_value, ctrl, irq; - - if (!pdata) { - dev_err(&pdev->dev, "missing platform data.\n"); - return -EINVAL; - } - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) { - dev_err(&pdev->dev, "no memory resource defined.\n"); - return -EINVAL; - } - - irq = platform_get_irq(pdev, 0); - if (irq < 0) { - dev_err(&pdev->dev, "no irq ID is specified.\n"); - return -EINVAL; - } - - /* Allocate memory for device */ - ts_dev = kzalloc(sizeof(struct tscadc), GFP_KERNEL); - input_dev = input_allocate_device(); - if (!ts_dev || !input_dev) { - dev_err(&pdev->dev, "failed to allocate memory.\n"); - err = -ENOMEM; - goto err_free_mem; - } - - ts_dev->input = input_dev; - ts_dev->irq = irq; - ts_dev->wires = pdata->wires; - ts_dev->x_plate_resistance = pdata->x_plate_resistance; - - res = request_mem_region(res->start, resource_size(res), pdev->name); - if (!res) { - dev_err(&pdev->dev, "failed to reserve registers.\n"); - err = -EBUSY; - goto err_free_mem; - } - - ts_dev->tsc_base = ioremap(res->start, resource_size(res)); - if (!ts_dev->tsc_base) { - dev_err(&pdev->dev, "failed to map registers.\n"); - err = -ENOMEM; - goto err_release_mem_region; - } - - err = request_irq(ts_dev->irq, tscadc_irq, - 0, pdev->dev.driver->name, ts_dev); - if (err) { - dev_err(&pdev->dev, "failed to allocate irq.\n"); - goto err_unmap_regs; - } - - ts_dev->tsc_ick = clk_get(&pdev->dev, "adc_tsc_ick"); - if (IS_ERR(ts_dev->tsc_ick)) { - dev_err(&pdev->dev, "failed to get TSC ick\n"); - goto err_free_irq; - } - clk_enable(ts_dev->tsc_ick); - - clk = clk_get(&pdev->dev, "adc_tsc_fck"); - if (IS_ERR(clk)) { - dev_err(&pdev->dev, "failed to get TSC fck\n"); - err = PTR_ERR(clk); - goto err_disable_clk; - } - - clk_value = clk_get_rate(clk) / ADC_CLK; - clk_put(clk); - - if (clk_value < 7) { - dev_err(&pdev->dev, "clock input less than min clock requirement\n"); - goto err_disable_clk; - } - /* CLKDIV needs to be configured to the value minus 1 */ - tscadc_writel(ts_dev, REG_CLKDIV, clk_value - 1); - - /* Enable wake-up of the SoC using touchscreen */ - tscadc_writel(ts_dev, REG_IRQWAKEUP, IRQWKUP_ENB); - - ctrl = CNTRLREG_STEPCONFIGWRT | - CNTRLREG_TSCENB | - CNTRLREG_STEPID; - switch (ts_dev->wires) { - case 4: - ctrl |= CNTRLREG_4WIRE; - break; - case 5: - ctrl |= CNTRLREG_5WIRE; - break; - case 8: - ctrl |= CNTRLREG_8WIRE; - break; - } - tscadc_writel(ts_dev, REG_CTRL, ctrl); - - tscadc_idle_config(ts_dev); - tscadc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO1THRES); - tscadc_step_config(ts_dev); - tscadc_writel(ts_dev, REG_FIFO1THR, 6); - - ctrl |= CNTRLREG_TSCSSENB; - tscadc_writel(ts_dev, REG_CTRL, ctrl); - - input_dev->name = "ti-tsc-adc"; - input_dev->dev.parent = &pdev->dev; - - input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); - input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); - - input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0); - input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0); - input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0); - - /* register to the input system */ - err = input_register_device(input_dev); - if (err) - goto err_disable_clk; - - platform_set_drvdata(pdev, ts_dev); - return 0; - -err_disable_clk: - clk_disable(ts_dev->tsc_ick); - clk_put(ts_dev->tsc_ick); -err_free_irq: - free_irq(ts_dev->irq, ts_dev); -err_unmap_regs: - iounmap(ts_dev->tsc_base); -err_release_mem_region: - release_mem_region(res->start, resource_size(res)); -err_free_mem: - input_free_device(input_dev); - kfree(ts_dev); - return err; -} - -static int __devexit tscadc_remove(struct platform_device *pdev) -{ - struct tscadc *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(ts_dev->tsc_base); - release_mem_region(res->start, resource_size(res)); - - clk_disable(ts_dev->tsc_ick); - clk_put(ts_dev->tsc_ick); - - kfree(ts_dev); - - platform_set_drvdata(pdev, NULL); - return 0; -} - -static struct platform_driver ti_tsc_driver = { - .probe = tscadc_probe, - .remove = __devexit_p(tscadc_remove), - .driver = { - .name = "tsc", - .owner = THIS_MODULE, - }, -}; -module_platform_driver(ti_tsc_driver); - -MODULE_DESCRIPTION("TI touchscreen controller driver"); -MODULE_AUTHOR("Rachna Patil <rachna@ti.com>"); -MODULE_LICENSE("GPL"); |