/* * Touchscreen driver for Marvell 88PM860x * * Copyright (C) 2009 Marvell International Ltd. * Haojian Zhuang * * 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 #include #include #include #include #include #include #define MEAS_LEN (8) #define ACCURATE_BIT (12) /* touch register */ #define MEAS_EN3 (0x52) #define MEAS_TSIX_1 (0x8D) #define MEAS_TSIX_2 (0x8E) #define MEAS_TSIY_1 (0x8F) #define MEAS_TSIY_2 (0x90) #define MEAS_TSIZ1_1 (0x91) #define MEAS_TSIZ1_2 (0x92) #define MEAS_TSIZ2_1 (0x93) #define MEAS_TSIZ2_2 (0x94) /* bit definitions of touch */ #define MEAS_PD_EN (1 << 3) #define MEAS_TSIX_EN (1 << 4) #define MEAS_TSIY_EN (1 << 5) #define MEAS_TSIZ1_EN (1 << 6) #define MEAS_TSIZ2_EN (1 << 7) struct pm860x_touch { struct input_dev *idev; struct i2c_client *i2c; struct pm860x_chip *chip; int irq; int res_x; /* resistor of Xplate */ }; static irqreturn_t pm860x_touch_handler(int irq, void *data) { struct pm860x_touch *touch = data; struct pm860x_chip *chip = touch->chip; unsigned char buf[MEAS_LEN]; int x, y, pen_down; int z1, z2, rt = 0; int ret; ret = pm860x_bulk_read(touch->i2c, MEAS_TSIX_1, MEAS_LEN, buf); if (ret < 0) goto out; pen_down = buf[1] & (1 << 6); x = ((buf[0] & 0xFF) << 4) | (buf[1] & 0x0F); y = ((buf[2] & 0xFF) << 4) | (buf[3] & 0x0F); z1 = ((buf[4] & 0xFF) << 4) | (buf[5] & 0x0F); z2 = ((buf[6] & 0xFF) << 4) | (buf[7] & 0x0F); if (pen_down) { if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) { rt = z2 / z1 - 1; rt = (rt * touch->res_x * x) >> ACCURATE_BIT; dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n", z1, z2, rt); } input_report_abs(touch->idev, ABS_X, x); input_report_abs(touch->idev, ABS_Y, y); input_report_abs(touch->idev, ABS_PRESSURE, rt); input_report_key(touch->idev, BTN_TOUCH, 1); dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y); } else { input_report_abs(touch->idev, ABS_PRESSURE, 0); input_report_key(touch->idev, BTN_TOUCH, 0); dev_dbg(chip->dev, "pen release\n"); } input_sync(touch->idev); out: return IRQ_HANDLED; } static int pm860x_touch_open(struct input_dev *dev) { struct pm860x_touch *touch = input_get_drvdata(dev); int data, ret; data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN; ret = pm860x_set_bits(touch->i2c, MEAS_EN3, data, data); if (ret < 0) goto out; return 0; out: return ret; } static void pm860x_touch_close(struct input_dev *dev) { struct pm860x_touch *touch = input_get_drvdata(dev); int data; data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN; pm860x_set_bits(touch->i2c, MEAS_EN3, data, 0); } static int __devinit pm860x_touch_probe(struct platform_device *pdev) { struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); struct pm860x_platform_data *pm860x_pdata = \ pdev->dev.parent->platform_data; struct pm860x_touch_pdata *pdata = NULL; struct pm860x_touch *touch; int irq, ret; irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_err(&pdev->dev, "No IRQ resource!\n"); return -EINVAL; } if (!pm860x_pdata) { dev_err(&pdev->dev, "platform data is missing\n"); return -EINVAL; } pdata = pm860x_pdata->touch; if (!pdata) { dev_err(&pdev->dev, "touchscreen data is missing\n"); return -EINVAL; } touch = kzalloc(sizeof(struct pm860x_touch), GFP_KERNEL); if (touch == NULL) return -ENOMEM; dev_set_drvdata(&pdev->dev, touch); touch->idev = input_allocate_device(); if (touch->idev == NULL) { dev_err(&pdev->dev, "Failed to allocate input device!\n"); ret = -ENOMEM; goto out; } touch->idev->name = "88pm860x-touch"; touch->idev->phys = "88pm860x/input0"; touch->idev->id.bustype = BUS_I2C; touch->idev->dev.parent = &pdev->dev; touch->idev->open = pm860x_touch_open; touch->idev->close = pm860x_touch_close; touch->chip = chip; touch->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion; touch->irq = irq + chip->irq_base; touch->res_x = pdata->res_x; input_set_drvdata(touch->idev, touch); ret = request_threaded_irq(touch->irq, NULL, pm860x_touch_handler, IRQF_ONESHOT, "touch", touch); if (ret < 0) goto out_irq; __set_bit(EV_ABS, touch->idev->evbit); __set_bit(ABS_X, touch->idev->absbit); __set_bit(ABS_Y, touch->idev->absbit); __set_bit(ABS_PRESSURE, touch->idev->absbit); __set_bit(EV_SYN, touch->idev->evbit); __set_bit(EV_KEY, touch->idev->evbit); __set_bit(BTN_TOUCH, touch->idev->keybit); input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0); input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0); input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT, 0, 0); ret = input_register_device(touch->idev); if (ret < 0) { dev_err(chip->dev, "Failed to register touch!\n"); goto out_rg; } platform_set_drvdata(pdev, touch); return 0; out_rg: free_irq(touch->irq, touch); out_irq: input_free_device(touch->idev); out: kfree(touch); return ret; } static int __devexit pm860x_touch_remove(struct platform_device *pdev) { struct pm860x_touch *touch = platform_get_drvdata(pdev); input_unregister_device(touch->idev); free_irq(touch->irq, touch); platform_set_drvdata(pdev, NULL); kfree(touch); return 0; } static struct platform_driver pm860x_touch_driver = { .driver = { .name = "88pm860x-touch", .owner = THIS_MODULE, }, .probe = pm860x_touch_probe, .remove = __devexit_p(pm860x_touch_remove), }; static int __init pm860x_touch_init(void) { return platform_driver_register(&pm860x_touch_driver); } module_init(pm860x_touch_init); static void __exit pm860x_touch_exit(void) { platform_driver_unregister(&pm860x_touch_driver); } module_exit(pm860x_touch_exit); MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x"); MODULE_AUTHOR("Haojian Zhuang "); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:88pm860x-touch");