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/platform_device.h> 17 #include <linux/input.h> 18 #include <linux/interrupt.h> 19 #include <linux/module.h> 20 #include <linux/slab.h> 21 #include <linux/io.h> 22 23 #include <mach/hardware.h> 24 #include <mach/jornada720.h> 25 #include <mach/irqs.h> 26 27 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>"); 28 MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver"); 29 MODULE_LICENSE("GPL v2"); 30 31 struct jornada_ts { 32 struct input_dev *dev; 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 40 /* 3 low word X samples */ 41 jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY); 42 jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY); 43 jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY); 44 45 /* 3 low word Y samples */ 46 jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY); 47 jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY); 48 jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY); 49 50 /* combined x samples bits */ 51 jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY); 52 53 /* combined y samples bits */ 54 jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY); 55 } 56 57 static int jornada720_ts_average(int coords[4]) 58 { 59 int coord, high_bits = coords[3]; 60 61 coord = coords[0] | ((high_bits & 0x03) << 8); 62 coord += coords[1] | ((high_bits & 0x0c) << 6); 63 coord += coords[2] | ((high_bits & 0x30) << 4); 64 65 return coord / 3; 66 } 67 68 static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id) 69 { 70 struct platform_device *pdev = dev_id; 71 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev); 72 struct input_dev *input = jornada_ts->dev; 73 int x, y; 74 75 /* If GPIO_GPIO9 is set to high then report pen up */ 76 if (GPLR & GPIO_GPIO(9)) { 77 input_report_key(input, BTN_TOUCH, 0); 78 input_sync(input); 79 } else { 80 jornada_ssp_start(); 81 82 /* proper reply to request is always TXDUMMY */ 83 if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) { 84 jornada720_ts_collect_data(jornada_ts); 85 86 x = jornada720_ts_average(jornada_ts->x_data); 87 y = jornada720_ts_average(jornada_ts->y_data); 88 89 input_report_key(input, BTN_TOUCH, 1); 90 input_report_abs(input, ABS_X, x); 91 input_report_abs(input, ABS_Y, y); 92 input_sync(input); 93 } 94 95 jornada_ssp_end(); 96 } 97 98 return IRQ_HANDLED; 99 } 100 101 static int jornada720_ts_probe(struct platform_device *pdev) 102 { 103 struct jornada_ts *jornada_ts; 104 struct input_dev *input_dev; 105 int error; 106 107 jornada_ts = kzalloc(sizeof(struct jornada_ts), GFP_KERNEL); 108 input_dev = input_allocate_device(); 109 110 if (!jornada_ts || !input_dev) { 111 error = -ENOMEM; 112 goto fail1; 113 } 114 115 platform_set_drvdata(pdev, jornada_ts); 116 117 jornada_ts->dev = input_dev; 118 119 input_dev->name = "HP Jornada 7xx Touchscreen"; 120 input_dev->phys = "jornadats/input0"; 121 input_dev->id.bustype = BUS_HOST; 122 input_dev->dev.parent = &pdev->dev; 123 124 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 125 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 126 input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0); 127 input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0); 128 129 error = request_irq(IRQ_GPIO9, 130 jornada720_ts_interrupt, 131 IRQF_TRIGGER_RISING, 132 "HP7XX Touchscreen driver", pdev); 133 if (error) { 134 printk(KERN_INFO "HP7XX TS : Unable to acquire irq!\n"); 135 goto fail1; 136 } 137 138 error = input_register_device(jornada_ts->dev); 139 if (error) 140 goto fail2; 141 142 return 0; 143 144 fail2: 145 free_irq(IRQ_GPIO9, pdev); 146 fail1: 147 input_free_device(input_dev); 148 kfree(jornada_ts); 149 return error; 150 } 151 152 static int jornada720_ts_remove(struct platform_device *pdev) 153 { 154 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev); 155 156 free_irq(IRQ_GPIO9, pdev); 157 input_unregister_device(jornada_ts->dev); 158 kfree(jornada_ts); 159 160 return 0; 161 } 162 163 /* work with hotplug and coldplug */ 164 MODULE_ALIAS("platform:jornada_ts"); 165 166 static struct platform_driver jornada720_ts_driver = { 167 .probe = jornada720_ts_probe, 168 .remove = jornada720_ts_remove, 169 .driver = { 170 .name = "jornada_ts", 171 .owner = THIS_MODULE, 172 }, 173 }; 174 module_platform_driver(jornada720_ts_driver); 175