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 #include <linux/slab.h> 22 #include <linux/io.h> 23 24 #include <mach/hardware.h> 25 #include <mach/jornada720.h> 26 #include <mach/irqs.h> 27 28 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>"); 29 MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver"); 30 MODULE_LICENSE("GPL v2"); 31 32 struct jornada_ts { 33 struct input_dev *dev; 34 int x_data[4]; /* X sample values */ 35 int y_data[4]; /* Y sample values */ 36 }; 37 38 static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts) 39 { 40 41 /* 3 low word X samples */ 42 jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY); 43 jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY); 44 jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY); 45 46 /* 3 low word Y samples */ 47 jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY); 48 jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY); 49 jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY); 50 51 /* combined x samples bits */ 52 jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY); 53 54 /* combined y samples bits */ 55 jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY); 56 } 57 58 static int jornada720_ts_average(int coords[4]) 59 { 60 int coord, high_bits = coords[3]; 61 62 coord = coords[0] | ((high_bits & 0x03) << 8); 63 coord += coords[1] | ((high_bits & 0x0c) << 6); 64 coord += coords[2] | ((high_bits & 0x30) << 4); 65 66 return coord / 3; 67 } 68 69 static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id) 70 { 71 struct platform_device *pdev = dev_id; 72 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev); 73 struct input_dev *input = jornada_ts->dev; 74 int x, y; 75 76 /* If GPIO_GPIO9 is set to high then report pen up */ 77 if (GPLR & GPIO_GPIO(9)) { 78 input_report_key(input, BTN_TOUCH, 0); 79 input_sync(input); 80 } else { 81 jornada_ssp_start(); 82 83 /* proper reply to request is always TXDUMMY */ 84 if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) { 85 jornada720_ts_collect_data(jornada_ts); 86 87 x = jornada720_ts_average(jornada_ts->x_data); 88 y = jornada720_ts_average(jornada_ts->y_data); 89 90 input_report_key(input, BTN_TOUCH, 1); 91 input_report_abs(input, ABS_X, x); 92 input_report_abs(input, ABS_Y, y); 93 input_sync(input); 94 } 95 96 jornada_ssp_end(); 97 } 98 99 return IRQ_HANDLED; 100 } 101 102 static int jornada720_ts_probe(struct platform_device *pdev) 103 { 104 struct jornada_ts *jornada_ts; 105 struct input_dev *input_dev; 106 int error; 107 108 jornada_ts = kzalloc(sizeof(struct jornada_ts), GFP_KERNEL); 109 input_dev = input_allocate_device(); 110 111 if (!jornada_ts || !input_dev) { 112 error = -ENOMEM; 113 goto fail1; 114 } 115 116 platform_set_drvdata(pdev, jornada_ts); 117 118 jornada_ts->dev = input_dev; 119 120 input_dev->name = "HP Jornada 7xx Touchscreen"; 121 input_dev->phys = "jornadats/input0"; 122 input_dev->id.bustype = BUS_HOST; 123 input_dev->dev.parent = &pdev->dev; 124 125 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 126 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 127 input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0); 128 input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0); 129 130 error = request_irq(IRQ_GPIO9, 131 jornada720_ts_interrupt, 132 IRQF_TRIGGER_RISING, 133 "HP7XX Touchscreen driver", pdev); 134 if (error) { 135 printk(KERN_INFO "HP7XX TS : Unable to acquire irq!\n"); 136 goto fail1; 137 } 138 139 error = input_register_device(jornada_ts->dev); 140 if (error) 141 goto fail2; 142 143 return 0; 144 145 fail2: 146 free_irq(IRQ_GPIO9, pdev); 147 fail1: 148 input_free_device(input_dev); 149 kfree(jornada_ts); 150 return error; 151 } 152 153 static int jornada720_ts_remove(struct platform_device *pdev) 154 { 155 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev); 156 157 free_irq(IRQ_GPIO9, pdev); 158 input_unregister_device(jornada_ts->dev); 159 kfree(jornada_ts); 160 161 return 0; 162 } 163 164 /* work with hotplug and coldplug */ 165 MODULE_ALIAS("platform:jornada_ts"); 166 167 static struct platform_driver jornada720_ts_driver = { 168 .probe = jornada720_ts_probe, 169 .remove = jornada720_ts_remove, 170 .driver = { 171 .name = "jornada_ts", 172 .owner = THIS_MODULE, 173 }, 174 }; 175 module_platform_driver(jornada720_ts_driver); 176