1 /* 2 * drivers/input/touchscreen/jornada720_ts.c 3 * 4 * Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com> 5 * 6 * Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl> 7 * based on HP Jornada 56x touchscreen driver by Alex Lange <chicken@handhelds.org> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 * 13 * HP Jornada 710/720/729 Touchscreen Driver 14 */ 15 16 #include <linux/gpio/consumer.h> 17 #include <linux/platform_device.h> 18 #include <linux/input.h> 19 #include <linux/interrupt.h> 20 #include <linux/module.h> 21 #include <linux/slab.h> 22 #include <linux/io.h> 23 24 #include <mach/jornada720.h> 25 26 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>"); 27 MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver"); 28 MODULE_LICENSE("GPL v2"); 29 30 struct jornada_ts { 31 struct input_dev *dev; 32 struct gpio_desc *gpio; 33 int x_data[4]; /* X sample values */ 34 int y_data[4]; /* Y sample values */ 35 }; 36 37 static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts) 38 { 39 /* 3 low word X samples */ 40 jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY); 41 jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY); 42 jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY); 43 44 /* 3 low word Y samples */ 45 jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY); 46 jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY); 47 jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY); 48 49 /* combined x samples bits */ 50 jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY); 51 52 /* combined y samples bits */ 53 jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY); 54 } 55 56 static int jornada720_ts_average(int coords[4]) 57 { 58 int coord, high_bits = coords[3]; 59 60 coord = coords[0] | ((high_bits & 0x03) << 8); 61 coord += coords[1] | ((high_bits & 0x0c) << 6); 62 coord += coords[2] | ((high_bits & 0x30) << 4); 63 64 return coord / 3; 65 } 66 67 static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id) 68 { 69 struct platform_device *pdev = dev_id; 70 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev); 71 struct input_dev *input = jornada_ts->dev; 72 int x, y; 73 74 /* If gpio is high then report pen up */ 75 if (gpiod_get_value(jornada_ts->gpio)) { 76 input_report_key(input, BTN_TOUCH, 0); 77 input_sync(input); 78 } else { 79 jornada_ssp_start(); 80 81 /* proper reply to request is always TXDUMMY */ 82 if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) { 83 jornada720_ts_collect_data(jornada_ts); 84 85 x = jornada720_ts_average(jornada_ts->x_data); 86 y = jornada720_ts_average(jornada_ts->y_data); 87 88 input_report_key(input, BTN_TOUCH, 1); 89 input_report_abs(input, ABS_X, x); 90 input_report_abs(input, ABS_Y, y); 91 input_sync(input); 92 } 93 94 jornada_ssp_end(); 95 } 96 97 return IRQ_HANDLED; 98 } 99 100 static int jornada720_ts_probe(struct platform_device *pdev) 101 { 102 struct jornada_ts *jornada_ts; 103 struct input_dev *input_dev; 104 int error, irq; 105 106 jornada_ts = devm_kzalloc(&pdev->dev, sizeof(*jornada_ts), GFP_KERNEL); 107 if (!jornada_ts) 108 return -ENOMEM; 109 110 input_dev = devm_input_allocate_device(&pdev->dev); 111 if (!input_dev) 112 return -ENOMEM; 113 114 platform_set_drvdata(pdev, jornada_ts); 115 116 jornada_ts->gpio = devm_gpiod_get(&pdev->dev, "penup", GPIOD_IN); 117 if (IS_ERR(jornada_ts->gpio)) 118 return PTR_ERR(jornada_ts->gpio); 119 120 irq = gpiod_to_irq(jornada_ts->gpio); 121 if (irq <= 0) 122 return irq < 0 ? irq : -EINVAL; 123 124 jornada_ts->dev = input_dev; 125 126 input_dev->name = "HP Jornada 7xx Touchscreen"; 127 input_dev->phys = "jornadats/input0"; 128 input_dev->id.bustype = BUS_HOST; 129 input_dev->dev.parent = &pdev->dev; 130 131 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 132 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 133 input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0); 134 input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0); 135 136 error = devm_request_irq(&pdev->dev, irq, jornada720_ts_interrupt, 137 IRQF_TRIGGER_RISING, 138 "HP7XX Touchscreen driver", pdev); 139 if (error) { 140 dev_err(&pdev->dev, "HP7XX TS : Unable to acquire irq!\n"); 141 return error; 142 } 143 144 error = input_register_device(jornada_ts->dev); 145 if (error) 146 return error; 147 148 return 0; 149 } 150 151 /* work with hotplug and coldplug */ 152 MODULE_ALIAS("platform:jornada_ts"); 153 154 static struct platform_driver jornada720_ts_driver = { 155 .probe = jornada720_ts_probe, 156 .driver = { 157 .name = "jornada_ts", 158 }, 159 }; 160 module_platform_driver(jornada720_ts_driver); 161