1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * drivers/input/touchscreen/jornada720_ts.c 4 * 5 * Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com> 6 * 7 * Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl> 8 * based on HP Jornada 56x touchscreen driver by Alex Lange <chicken@handhelds.org> 9 * 10 * HP Jornada 710/720/729 Touchscreen Driver 11 */ 12 13 #include <linux/gpio/consumer.h> 14 #include <linux/platform_device.h> 15 #include <linux/input.h> 16 #include <linux/interrupt.h> 17 #include <linux/module.h> 18 #include <linux/slab.h> 19 #include <linux/io.h> 20 21 #include <mach/jornada720.h> 22 23 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>"); 24 MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver"); 25 MODULE_LICENSE("GPL v2"); 26 27 struct jornada_ts { 28 struct input_dev *dev; 29 struct gpio_desc *gpio; 30 int x_data[4]; /* X sample values */ 31 int y_data[4]; /* Y sample values */ 32 }; 33 34 static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts) 35 { 36 /* 3 low word X samples */ 37 jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY); 38 jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY); 39 jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY); 40 41 /* 3 low word Y samples */ 42 jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY); 43 jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY); 44 jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY); 45 46 /* combined x samples bits */ 47 jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY); 48 49 /* combined y samples bits */ 50 jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY); 51 } 52 53 static int jornada720_ts_average(int coords[4]) 54 { 55 int coord, high_bits = coords[3]; 56 57 coord = coords[0] | ((high_bits & 0x03) << 8); 58 coord += coords[1] | ((high_bits & 0x0c) << 6); 59 coord += coords[2] | ((high_bits & 0x30) << 4); 60 61 return coord / 3; 62 } 63 64 static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id) 65 { 66 struct platform_device *pdev = dev_id; 67 struct jornada_ts *jornada_ts = platform_get_drvdata(pdev); 68 struct input_dev *input = jornada_ts->dev; 69 int x, y; 70 71 /* If gpio is high then report pen up */ 72 if (gpiod_get_value(jornada_ts->gpio)) { 73 input_report_key(input, BTN_TOUCH, 0); 74 input_sync(input); 75 } else { 76 jornada_ssp_start(); 77 78 /* proper reply to request is always TXDUMMY */ 79 if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) { 80 jornada720_ts_collect_data(jornada_ts); 81 82 x = jornada720_ts_average(jornada_ts->x_data); 83 y = jornada720_ts_average(jornada_ts->y_data); 84 85 input_report_key(input, BTN_TOUCH, 1); 86 input_report_abs(input, ABS_X, x); 87 input_report_abs(input, ABS_Y, y); 88 input_sync(input); 89 } 90 91 jornada_ssp_end(); 92 } 93 94 return IRQ_HANDLED; 95 } 96 97 static int jornada720_ts_probe(struct platform_device *pdev) 98 { 99 struct jornada_ts *jornada_ts; 100 struct input_dev *input_dev; 101 int error, irq; 102 103 jornada_ts = devm_kzalloc(&pdev->dev, sizeof(*jornada_ts), GFP_KERNEL); 104 if (!jornada_ts) 105 return -ENOMEM; 106 107 input_dev = devm_input_allocate_device(&pdev->dev); 108 if (!input_dev) 109 return -ENOMEM; 110 111 platform_set_drvdata(pdev, jornada_ts); 112 113 jornada_ts->gpio = devm_gpiod_get(&pdev->dev, "penup", GPIOD_IN); 114 if (IS_ERR(jornada_ts->gpio)) 115 return PTR_ERR(jornada_ts->gpio); 116 117 irq = gpiod_to_irq(jornada_ts->gpio); 118 if (irq <= 0) 119 return irq < 0 ? irq : -EINVAL; 120 121 jornada_ts->dev = input_dev; 122 123 input_dev->name = "HP Jornada 7xx Touchscreen"; 124 input_dev->phys = "jornadats/input0"; 125 input_dev->id.bustype = BUS_HOST; 126 input_dev->dev.parent = &pdev->dev; 127 128 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 129 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 130 input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0); 131 input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0); 132 133 error = devm_request_irq(&pdev->dev, irq, jornada720_ts_interrupt, 134 IRQF_TRIGGER_RISING, 135 "HP7XX Touchscreen driver", pdev); 136 if (error) { 137 dev_err(&pdev->dev, "HP7XX TS : Unable to acquire irq!\n"); 138 return error; 139 } 140 141 error = input_register_device(jornada_ts->dev); 142 if (error) 143 return error; 144 145 return 0; 146 } 147 148 /* work with hotplug and coldplug */ 149 MODULE_ALIAS("platform:jornada_ts"); 150 151 static struct platform_driver jornada720_ts_driver = { 152 .probe = jornada720_ts_probe, 153 .driver = { 154 .name = "jornada_ts", 155 }, 156 }; 157 module_platform_driver(jornada720_ts_driver); 158