1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * h3600 atmel micro companion support, touchscreen subdevice 5 * Author : Alessandro Gardich <gremlin@gremlin.it> 6 * Author : Dmitry Artamonow <mad_soft@inbox.ru> 7 * Author : Linus Walleij <linus.walleij@linaro.org> 8 */ 9 10 #include <asm/byteorder.h> 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/interrupt.h> 14 #include <linux/pm.h> 15 #include <linux/delay.h> 16 #include <linux/device.h> 17 #include <linux/input.h> 18 #include <linux/platform_device.h> 19 #include <linux/slab.h> 20 #include <linux/mfd/ipaq-micro.h> 21 22 struct touchscreen_data { 23 struct input_dev *input; 24 struct ipaq_micro *micro; 25 }; 26 27 static void micro_ts_receive(void *data, int len, unsigned char *msg) 28 { 29 struct touchscreen_data *ts = data; 30 31 if (len == 4) { 32 input_report_abs(ts->input, ABS_X, 33 be16_to_cpup((__be16 *) &msg[2])); 34 input_report_abs(ts->input, ABS_Y, 35 be16_to_cpup((__be16 *) &msg[0])); 36 input_report_key(ts->input, BTN_TOUCH, 1); 37 input_sync(ts->input); 38 } else if (len == 0) { 39 input_report_abs(ts->input, ABS_X, 0); 40 input_report_abs(ts->input, ABS_Y, 0); 41 input_report_key(ts->input, BTN_TOUCH, 0); 42 input_sync(ts->input); 43 } 44 } 45 46 static void micro_ts_toggle_receive(struct touchscreen_data *ts, bool enable) 47 { 48 struct ipaq_micro *micro = ts->micro; 49 50 guard(spinlock_irq)(µ->lock); 51 52 if (enable) { 53 micro->ts = micro_ts_receive; 54 micro->ts_data = ts; 55 } else { 56 micro->ts = NULL; 57 micro->ts_data = NULL; 58 } 59 } 60 61 static int micro_ts_open(struct input_dev *input) 62 { 63 struct touchscreen_data *ts = input_get_drvdata(input); 64 65 micro_ts_toggle_receive(ts, true); 66 67 return 0; 68 } 69 70 static void micro_ts_close(struct input_dev *input) 71 { 72 struct touchscreen_data *ts = input_get_drvdata(input); 73 74 micro_ts_toggle_receive(ts, false); 75 } 76 77 static int micro_ts_probe(struct platform_device *pdev) 78 { 79 struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent); 80 struct touchscreen_data *ts; 81 int error; 82 83 ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL); 84 if (!ts) 85 return -ENOMEM; 86 87 ts->micro = micro; 88 89 ts->input = devm_input_allocate_device(&pdev->dev); 90 if (!ts->input) { 91 dev_err(&pdev->dev, "failed to allocate input device\n"); 92 return -ENOMEM; 93 } 94 95 ts->input->name = "ipaq micro ts"; 96 ts->input->open = micro_ts_open; 97 ts->input->close = micro_ts_close; 98 99 input_set_drvdata(ts->input, ts); 100 101 input_set_capability(ts->input, EV_KEY, BTN_TOUCH); 102 input_set_capability(ts->input, EV_ABS, ABS_X); 103 input_set_capability(ts->input, EV_ABS, ABS_Y); 104 input_set_abs_params(ts->input, ABS_X, 0, 1023, 0, 0); 105 input_set_abs_params(ts->input, ABS_Y, 0, 1023, 0, 0); 106 107 error = input_register_device(ts->input); 108 if (error) { 109 dev_err(&pdev->dev, "error registering touch input\n"); 110 return error; 111 } 112 113 platform_set_drvdata(pdev, ts); 114 115 dev_info(&pdev->dev, "iPAQ micro touchscreen\n"); 116 117 return 0; 118 } 119 120 static int micro_ts_suspend(struct device *dev) 121 { 122 struct touchscreen_data *ts = dev_get_drvdata(dev); 123 124 micro_ts_toggle_receive(ts, false); 125 126 return 0; 127 } 128 129 static int micro_ts_resume(struct device *dev) 130 { 131 struct touchscreen_data *ts = dev_get_drvdata(dev); 132 struct input_dev *input = ts->input; 133 134 guard(mutex)(&input->mutex); 135 136 if (input_device_enabled(input)) 137 micro_ts_toggle_receive(ts, true); 138 139 return 0; 140 } 141 142 static DEFINE_SIMPLE_DEV_PM_OPS(micro_ts_dev_pm_ops, 143 micro_ts_suspend, micro_ts_resume); 144 145 static struct platform_driver micro_ts_device_driver = { 146 .driver = { 147 .name = "ipaq-micro-ts", 148 .pm = pm_sleep_ptr(µ_ts_dev_pm_ops), 149 }, 150 .probe = micro_ts_probe, 151 }; 152 module_platform_driver(micro_ts_device_driver); 153 154 MODULE_LICENSE("GPL"); 155 MODULE_DESCRIPTION("driver for iPAQ Atmel micro touchscreen"); 156 MODULE_ALIAS("platform:ipaq-micro-ts"); 157