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/init.h> 18 #include <linux/input.h> 19 #include <linux/interrupt.h> 20 #include <linux/module.h> 21 22 #include <mach/hardware.h> 23 #include <mach/jornada720.h> 24 25 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>"); 26 MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver"); 27 MODULE_LICENSE("GPL v2"); 28 29 struct jornada_ts { 30 struct input_dev *dev; 31 int x_data[4]; /* X sample values */ 32 int y_data[4]; /* Y sample values */ 33 }; 34 35 static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts) 36 { 37 38 /* 3 low word X samples */ 39 jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY); 40 jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY); 41 jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY); 42 43 /* 3 low word Y samples */ 44 jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY); 45 jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY); 46 jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY); 47 48 /* combined x samples bits */ 49 jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY); 50 51 /* combined y samples bits */ 52 jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY); 53 } 54 55 static int jornada720_ts_average(int coords[4]) 56 { 57 int coord, high_bits = coords[3]; 58 59 coord = coords[0] | ((high_bits & 0x03) << 8); 60 coord += coords[1] | ((high_bits & 0x0c) << 6); 61 coord += coords[2] | ((high_bits & 0x30) << 4); 62 63 return coord / 3; 64 } 65 66 static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id) 67 { 68 struct platform_device *pdev = dev_id; 69 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev); 70 struct input_dev *input = jornada_ts->dev; 71 int x, y; 72 73 /* If GPIO_GPIO9 is set to high then report pen up */ 74 if (GPLR & GPIO_GPIO(9)) { 75 input_report_key(input, BTN_TOUCH, 0); 76 input_sync(input); 77 } else { 78 jornada_ssp_start(); 79 80 /* proper reply to request is always TXDUMMY */ 81 if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) { 82 jornada720_ts_collect_data(jornada_ts); 83 84 x = jornada720_ts_average(jornada_ts->x_data); 85 y = jornada720_ts_average(jornada_ts->y_data); 86 87 input_report_key(input, BTN_TOUCH, 1); 88 input_report_abs(input, ABS_X, x); 89 input_report_abs(input, ABS_Y, y); 90 input_sync(input); 91 } 92 93 jornada_ssp_end(); 94 } 95 96 return IRQ_HANDLED; 97 } 98 99 static int __devinit jornada720_ts_probe(struct platform_device *pdev) 100 { 101 struct jornada_ts *jornada_ts; 102 struct input_dev *input_dev; 103 int error; 104 105 jornada_ts = kzalloc(sizeof(struct jornada_ts), GFP_KERNEL); 106 input_dev = input_allocate_device(); 107 108 if (!jornada_ts || !input_dev) { 109 error = -ENOMEM; 110 goto fail1; 111 } 112 113 platform_set_drvdata(pdev, jornada_ts); 114 115 jornada_ts->dev = input_dev; 116 117 input_dev->name = "HP Jornada 7xx Touchscreen"; 118 input_dev->phys = "jornadats/input0"; 119 input_dev->id.bustype = BUS_HOST; 120 input_dev->dev.parent = &pdev->dev; 121 122 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 123 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 124 input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0); 125 input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0); 126 127 error = request_irq(IRQ_GPIO9, 128 jornada720_ts_interrupt, 129 IRQF_DISABLED | IRQF_TRIGGER_RISING, 130 "HP7XX Touchscreen driver", pdev); 131 if (error) { 132 printk(KERN_INFO "HP7XX TS : Unable to acquire irq!\n"); 133 goto fail1; 134 } 135 136 error = input_register_device(jornada_ts->dev); 137 if (error) 138 goto fail2; 139 140 return 0; 141 142 fail2: 143 free_irq(IRQ_GPIO9, pdev); 144 fail1: 145 platform_set_drvdata(pdev, NULL); 146 input_free_device(input_dev); 147 kfree(jornada_ts); 148 return error; 149 } 150 151 static int __devexit jornada720_ts_remove(struct platform_device *pdev) 152 { 153 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev); 154 155 free_irq(IRQ_GPIO9, pdev); 156 platform_set_drvdata(pdev, NULL); 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 = __devexit_p(jornada720_ts_remove), 169 .driver = { 170 .name = "jornada_ts", 171 .owner = THIS_MODULE, 172 }, 173 }; 174 175 static int __init jornada720_ts_init(void) 176 { 177 return platform_driver_register(&jornada720_ts_driver); 178 } 179 180 static void __exit jornada720_ts_exit(void) 181 { 182 platform_driver_unregister(&jornada720_ts_driver); 183 } 184 185 module_init(jornada720_ts_init); 186 module_exit(jornada720_ts_exit); 187