drivers/input/touchscreen/88pm860x-ts.c

   1 /*
   2  * Touchscreen driver for Marvell 88PM860x
   3  *
   4  * Copyright (C) 2009 Marvell International Ltd.
   5  *      Haojian Zhuang <haojian.zhuang@marvell.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/i2c.h>
  15 #include <linux/input.h>
  16 #include <linux/mfd/88pm860x.h>
  17
  18 #define MEAS_LEN                (8)
  19 #define ACCURATE_BIT            (12)
  20
  21 /* touch register */
  22 #define MEAS_EN3                (0x52)
  23
  24 #define MEAS_TSIX_1             (0x8D)
  25 #define MEAS_TSIX_2             (0x8E)
  26 #define MEAS_TSIY_1             (0x8F)
  27 #define MEAS_TSIY_2             (0x90)
  28 #define MEAS_TSIZ1_1            (0x91)
  29 #define MEAS_TSIZ1_2            (0x92)
  30 #define MEAS_TSIZ2_1            (0x93)
  31 #define MEAS_TSIZ2_2            (0x94)
  32
  33 /* bit definitions of touch */
  34 #define MEAS_PD_EN              (1 << 3)
  35 #define MEAS_TSIX_EN            (1 << 4)
  36 #define MEAS_TSIY_EN            (1 << 5)
  37 #define MEAS_TSIZ1_EN           (1 << 6)
  38 #define MEAS_TSIZ2_EN           (1 << 7)
  39
  40 struct pm860x_touch {
  41         struct input_dev *idev;
  42         struct i2c_client *i2c;
  43         struct pm860x_chip *chip;
  44         int irq;
  45         int res_x;              /* resistor of Xplate */
  46 };
  47
  48 static irqreturn_t pm860x_touch_handler(int irq, void *data)
  49 {
  50         struct pm860x_touch *touch = data;
  51         struct pm860x_chip *chip = touch->chip;
  52         unsigned char buf[MEAS_LEN];
  53         int x, y, pen_down;
  54         int z1, z2, rt = 0;
  55         int ret;
  56
  57         ret = pm860x_bulk_read(touch->i2c, MEAS_TSIX_1, MEAS_LEN, buf);
  58         if (ret < 0)
  59                 goto out;
  60
  61         pen_down = buf[1] & (1 << 6);
  62         x = ((buf[0] & 0xFF) << 4) | (buf[1] & 0x0F);
  63         y = ((buf[2] & 0xFF) << 4) | (buf[3] & 0x0F);
  64         z1 = ((buf[4] & 0xFF) << 4) | (buf[5] & 0x0F);
  65         z2 = ((buf[6] & 0xFF) << 4) | (buf[7] & 0x0F);
  66
  67         if (pen_down) {
  68                 if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) {
  69                         rt = z2 / z1 - 1;
  70                         rt = (rt * touch->res_x * x) >> ACCURATE_BIT;
  71                         dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n",
  72                                 z1, z2, rt);
  73                 }
  74                 input_report_abs(touch->idev, ABS_X, x);
  75                 input_report_abs(touch->idev, ABS_Y, y);
  76                 input_report_abs(touch->idev, ABS_PRESSURE, rt);
  77                 input_report_key(touch->idev, BTN_TOUCH, 1);
  78                 dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y);
  79         } else {
  80                 input_report_abs(touch->idev, ABS_PRESSURE, 0);
  81                 input_report_key(touch->idev, BTN_TOUCH, 0);
  82                 dev_dbg(chip->dev, "pen release\n");
  83         }
  84         input_sync(touch->idev);
  85
  86 out:
  87         return IRQ_HANDLED;
  88 }
  89
  90 static int pm860x_touch_open(struct input_dev *dev)
  91 {
  92         struct pm860x_touch *touch = input_get_drvdata(dev);
  93         int data, ret;
  94
  95         data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
  96                 | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
  97         ret = pm860x_set_bits(touch->i2c, MEAS_EN3, data, data);
  98         if (ret < 0)
  99                 goto out;
 100         return 0;
 101 out:
 102         return ret;
 103 }
 104
 105 static void pm860x_touch_close(struct input_dev *dev)
 106 {
 107         struct pm860x_touch *touch = input_get_drvdata(dev);
 108         int data;
 109
 110         data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
 111                 | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
 112         pm860x_set_bits(touch->i2c, MEAS_EN3, data, 0);
 113 }
 114
 115 static int __devinit pm860x_touch_probe(struct platform_device *pdev)
 116 {
 117         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 118         struct pm860x_platform_data *pm860x_pdata =             \
 119                                 pdev->dev.parent->platform_data;
 120         struct pm860x_touch_pdata *pdata = NULL;
 121         struct pm860x_touch *touch;
 122         int irq, ret;
 123
 124         irq = platform_get_irq(pdev, 0);
 125         if (irq < 0) {
 126                 dev_err(&pdev->dev, "No IRQ resource!\n");
 127                 return -EINVAL;
 128         }
 129
 130         if (!pm860x_pdata) {
 131                 dev_err(&pdev->dev, "platform data is missing\n");
 132                 return -EINVAL;
 133         }
 134
 135         pdata = pm860x_pdata->touch;
 136         if (!pdata) {
 137                 dev_err(&pdev->dev, "touchscreen data is missing\n");
 138                 return -EINVAL;
 139         }
 140
 141         touch = kzalloc(sizeof(struct pm860x_touch), GFP_KERNEL);
 142         if (touch == NULL)
 143                 return -ENOMEM;
 144         dev_set_drvdata(&pdev->dev, touch);
 145
 146         touch->idev = input_allocate_device();
 147         if (touch->idev == NULL) {
 148                 dev_err(&pdev->dev, "Failed to allocate input device!\n");
 149                 ret = -ENOMEM;
 150                 goto out;
 151         }
 152
 153         touch->idev->name = "88pm860x-touch";
 154         touch->idev->phys = "88pm860x/input0";
 155         touch->idev->id.bustype = BUS_I2C;
 156         touch->idev->dev.parent = &pdev->dev;
 157         touch->idev->open = pm860x_touch_open;
 158         touch->idev->close = pm860x_touch_close;
 159         touch->chip = chip;
 160         touch->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
 161         touch->irq = irq + chip->irq_base;
 162         touch->res_x = pdata->res_x;
 163         input_set_drvdata(touch->idev, touch);
 164
 165         ret = request_threaded_irq(touch->irq, NULL, pm860x_touch_handler,
 166                                    IRQF_ONESHOT, "touch", touch);
 167         if (ret < 0)
 168                 goto out_irq;
 169
 170         __set_bit(EV_ABS, touch->idev->evbit);
 171         __set_bit(ABS_X, touch->idev->absbit);
 172         __set_bit(ABS_Y, touch->idev->absbit);
 173         __set_bit(ABS_PRESSURE, touch->idev->absbit);
 174         __set_bit(EV_SYN, touch->idev->evbit);
 175         __set_bit(EV_KEY, touch->idev->evbit);
 176         __set_bit(BTN_TOUCH, touch->idev->keybit);
 177
 178         input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0);
 179         input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0);
 180         input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT,
 181                                 0, 0);
 182
 183         ret = input_register_device(touch->idev);
 184         if (ret < 0) {
 185                 dev_err(chip->dev, "Failed to register touch!\n");
 186                 goto out_rg;
 187         }
 188
 189         platform_set_drvdata(pdev, touch);
 190         return 0;
 191 out_rg:
 192         free_irq(touch->irq, touch);
 193 out_irq:
 194         input_free_device(touch->idev);
 195 out:
 196         kfree(touch);
 197         return ret;
 198 }
 199
 200 static int __devexit pm860x_touch_remove(struct platform_device *pdev)
 201 {
 202         struct pm860x_touch *touch = platform_get_drvdata(pdev);
 203
 204         input_unregister_device(touch->idev);
 205         free_irq(touch->irq, touch);
 206         platform_set_drvdata(pdev, NULL);
 207         kfree(touch);
 208         return 0;
 209 }
 210
 211 static struct platform_driver pm860x_touch_driver = {
 212         .driver = {
 213                 .name   = "88pm860x-touch",
 214                 .owner  = THIS_MODULE,
 215         },
 216         .probe  = pm860x_touch_probe,
 217         .remove = __devexit_p(pm860x_touch_remove),
 218 };
 219
 220 static int __init pm860x_touch_init(void)
 221 {
 222         return platform_driver_register(&pm860x_touch_driver);
 223 }
 224 module_init(pm860x_touch_init);
 225
 226 static void __exit pm860x_touch_exit(void)
 227 {
 228         platform_driver_unregister(&pm860x_touch_driver);
 229 }
 230 module_exit(pm860x_touch_exit);
 231
 232 MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x");
 233 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 234 MODULE_LICENSE("GPL");
 235 MODULE_ALIAS("platform:88pm860x-touch");
 236