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 spin_lock_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 spin_unlock_irq(&ts->micro->lock); 61 } 62 63 static int micro_ts_open(struct input_dev *input) 64 { 65 struct touchscreen_data *ts = input_get_drvdata(input); 66 67 micro_ts_toggle_receive(ts, true); 68 69 return 0; 70 } 71 72 static void micro_ts_close(struct input_dev *input) 73 { 74 struct touchscreen_data *ts = input_get_drvdata(input); 75 76 micro_ts_toggle_receive(ts, false); 77 } 78 79 static int micro_ts_probe(struct platform_device *pdev) 80 { 81 struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent); 82 struct touchscreen_data *ts; 83 int error; 84 85 ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL); 86 if (!ts) 87 return -ENOMEM; 88 89 ts->micro = micro; 90 91 ts->input = devm_input_allocate_device(&pdev->dev); 92 if (!ts->input) { 93 dev_err(&pdev->dev, "failed to allocate input device\n"); 94 return -ENOMEM; 95 } 96 97 ts->input->name = "ipaq micro ts"; 98 ts->input->open = micro_ts_open; 99 ts->input->close = micro_ts_close; 100 101 input_set_drvdata(ts->input, ts); 102 103 input_set_capability(ts->input, EV_KEY, BTN_TOUCH); 104 input_set_capability(ts->input, EV_ABS, ABS_X); 105 input_set_capability(ts->input, EV_ABS, ABS_Y); 106 input_set_abs_params(ts->input, ABS_X, 0, 1023, 0, 0); 107 input_set_abs_params(ts->input, ABS_Y, 0, 1023, 0, 0); 108 109 error = input_register_device(ts->input); 110 if (error) { 111 dev_err(&pdev->dev, "error registering touch input\n"); 112 return error; 113 } 114 115 platform_set_drvdata(pdev, ts); 116 117 dev_info(&pdev->dev, "iPAQ micro touchscreen\n"); 118 119 return 0; 120 } 121 122 static int micro_ts_suspend(struct device *dev) 123 { 124 struct touchscreen_data *ts = dev_get_drvdata(dev); 125 126 micro_ts_toggle_receive(ts, false); 127 128 return 0; 129 } 130 131 static int micro_ts_resume(struct device *dev) 132 { 133 struct touchscreen_data *ts = dev_get_drvdata(dev); 134 struct input_dev *input = ts->input; 135 136 mutex_lock(&input->mutex); 137 138 if (input_device_enabled(input)) 139 micro_ts_toggle_receive(ts, true); 140 141 mutex_unlock(&input->mutex); 142 143 return 0; 144 } 145 146 static DEFINE_SIMPLE_DEV_PM_OPS(micro_ts_dev_pm_ops, 147 micro_ts_suspend, micro_ts_resume); 148 149 static struct platform_driver micro_ts_device_driver = { 150 .driver = { 151 .name = "ipaq-micro-ts", 152 .pm = pm_sleep_ptr(µ_ts_dev_pm_ops), 153 }, 154 .probe = micro_ts_probe, 155 }; 156 module_platform_driver(micro_ts_device_driver); 157 158 MODULE_LICENSE("GPL"); 159 MODULE_DESCRIPTION("driver for iPAQ Atmel micro touchscreen"); 160 MODULE_ALIAS("platform:ipaq-micro-ts"); 161