MTK touchscreen 流程
1. kernel-3.18/drivers/input/touchscreen/mediatek/tpd_common_probe.c
1 static int __init tpd_probe_init(void) 2 { 3 tpd_device_init(); 4 return 0; 5 }
2. kernel-3.18/drivers/input/touchscreen/mediatek/mtk_tpd.c
1 int tpd_device_init(void) 2 { 3 int res = 0; 4 5 tpd_init_workqueue = create_singlethread_workqueue("mtk-tpd"); 6 INIT_WORK(&tpd_init_work, tpd_init_work_callback); 7 8 res = queue_work(tpd_init_workqueue, &tpd_init_work); 9 if (!res) 10 pr_err("tpd : touch device init failed res:%d\n", res); 11 return 0; 12 }
3. kernel-3.18/drivers/input/touchscreen/mediatek/mtk_tpd.c
1 /* called when loaded into kernel */ 2 static void tpd_init_work_callback(struct work_struct *work) 3 { 4 TPD_DEBUG("MediaTek touch panel driver init\n"); 5 6 if (platform_driver_register(&tpd_driver) != 0) 7 TPD_DMESG("unable to register touch panel driver.\n"); 8 }
platform_device 和 platform_driver 匹配后，调用tpd_probe
1 static struct platform_driver tpd_driver = { 2 .remove = tpd_remove, 3 .shutdown = NULL, 4 .probe = tpd_probe, 5 .driver = { 6 .name = TPD_DEVICE, 7 .pm = &tpd_pm_ops, 8 .owner = THIS_MODULE, 9 .of_match_table = touch_of_match, 10 }, 11 };
1 /* touch panel probe */ 2 static int tpd_probe(struct platform_device *pdev) 3 { 4 int touch_type = 1; /* 0:R-touch, 1: Cap-touch */ 5 int i = 0; 6 #ifndef CONFIG_CUSTOM_LCM_X 7 #ifdef CONFIG_LCM_WIDTH 8 unsigned long tpd_res_x = 0, tpd_res_y = 0; 9 int ret = 0; 10 #endif 11 #endif 12 13 TPD_DMESG("enter %s, %d\n", __func__, __LINE__); 14 15 if (misc_register(&tpd_misc_device)) 16 pr_err("mtk_tpd: tpd_misc_device register failed\n"); 17 tpd_get_gpio_info(pdev); 18 tpd = kmalloc(sizeof(struct tpd_device), GFP_KERNEL); 19 if (tpd == NULL) 20 return -ENOMEM; 21 memset(tpd, 0, sizeof(struct tpd_device)); 22 23 /* allocate input device */ 24 tpd->dev = input_allocate_device(); 25 if (tpd->dev == NULL) { 26 kfree(tpd); 27 return -ENOMEM; 28 } 29 /* TPD_RES_X = simple_strtoul(LCM_WIDTH, NULL, 0); */ 30 /* TPD_RES_Y = simple_strtoul(LCM_HEIGHT, NULL, 0); */ 31 32 #ifdef CONFIG_MTK_LCM_PHYSICAL_ROTATION 33 if (0 == strncmp(CONFIG_MTK_LCM_PHYSICAL_ROTATION, "90", 2) 34 || 0 == strncmp(CONFIG_MTK_LCM_PHYSICAL_ROTATION, "270", 3)) { 35 #ifdef CONFIG_MTK_FB /*Fix build errors,as some projects cannot support these apis while bring up*/ 36 TPD_RES_Y = DISP_GetScreenWidth(); 37 TPD_RES_X = DISP_GetScreenHeight(); 38 #endif 39 } else 40 #endif 41 { 42 #ifdef CONFIG_CUSTOM_LCM_X 43 #ifndef CONFIG_MTK_FPGA 44 #ifdef CONFIG_MTK_FB /*Fix build errors,as some projects cannot support these apis while bring up*/ 45 TPD_RES_X = DISP_GetScreenWidth(); 46 TPD_RES_Y = DISP_GetScreenHeight(); 47 #else/*for some projects, we do not use mtk framebuffer*/ 48 TPD_RES_X = tpd_dts_data.tpd_resolution[0]; 49 TPD_RES_Y = tpd_dts_data.tpd_resolution[1]; 50 #endif 51 #endif 52 #else 53 #ifdef CONFIG_LCM_WIDTH 54 ret = kstrtoul(CONFIG_LCM_WIDTH, 0, &tpd_res_x); 55 if (ret < 0) { 56 pr_err("Touch down get lcm_x failed"); 57 return ret; 58 } 59 TPD_RES_X = tpd_res_x; 60 ret = kstrtoul(CONFIG_LCM_HEIGHT, 0, &tpd_res_y); 61 if (ret < 0) { 62 pr_err("Touch down get lcm_y failed"); 63 return ret; 64 } 65 TPD_RES_Y = tpd_res_y; 66 #endif 67 #endif 68 } 69 70 if (2560 == TPD_RES_X) 71 TPD_RES_X = 2048; 72 if (1600 == TPD_RES_Y) 73 TPD_RES_Y = 1536; 74 pr_debug("mtk_tpd: TPD_RES_X = %lu, TPD_RES_Y = %lu\n", TPD_RES_X, TPD_RES_Y); 75 76 tpd_mode = TPD_MODE_NORMAL; 77 tpd_mode_axis = 0; 78 tpd_mode_min = TPD_RES_Y / 2; 79 tpd_mode_max = TPD_RES_Y; 80 tpd_mode_keypad_tolerance = TPD_RES_X * TPD_RES_X / 1600; 81 /* struct input_dev dev initialization and registration */ 82 tpd->dev->name = TPD_DEVICE; 83 set_bit(EV_ABS, tpd->dev->evbit); 84 set_bit(EV_KEY, tpd->dev->evbit); 85 set_bit(ABS_X, tpd->dev->absbit); 86 set_bit(ABS_Y, tpd->dev->absbit); 87 set_bit(ABS_PRESSURE, tpd->dev->absbit); 88 #if !defined(CONFIG_MTK_S3320) && !defined(CONFIG_MTK_S3320_47)\ 89 && !defined(CONFIG_MTK_S3320_50) && !defined(CONFIG_MTK_MIT200) \ 90 && !defined(CONFIG_TOUCHSCREEN_SYNAPTICS_S3528) && !defined(CONFIG_MTK_S7020) \ 91 && !defined(CONFIG_TOUCHSCREEN_MTK_SYNAPTICS_3320_50) 92 set_bit(BTN_TOUCH, tpd->dev->keybit); 93 #endif /* CONFIG_MTK_S3320 */ 94 set_bit(INPUT_PROP_DIRECT, tpd->dev->propbit); 95 96 /* save dev for regulator_get() before tpd_local_init() */ 97 tpd->tpd_dev = &pdev->dev; 98 for (i = 1; i < TP_DRV_MAX_COUNT; i++) { 99 /* add tpd driver into list */ 100 if (tpd_driver_list[i].tpd_device_name != NULL) { 101 tpd_driver_list[i].tpd_local_init(); 102 /* msleep(1); */ 103 if (tpd_load_status == 1) { 104 TPD_DMESG("[mtk-tpd]tpd_probe, tpd_driver_name=%s\n", 105 tpd_driver_list[i].tpd_device_name); 106 g_tpd_drv = &tpd_driver_list[i]; 107 break; 108 } 109 } 110 } 111 if (g_tpd_drv == NULL) { 112 if (tpd_driver_list[0].tpd_device_name != NULL) { 113 g_tpd_drv = &tpd_driver_list[0]; 114 /* touch_type:0: r-touch, 1: C-touch */ 115 touch_type = 0; 116 g_tpd_drv->tpd_local_init(); 117 TPD_DMESG("[mtk-tpd]Generic touch panel driver\n"); 118 } else { 119 TPD_DMESG("[mtk-tpd]cap touch and Generic touch both are not loaded!!\n"); 120 return 0; 121 } 122 } 123 touch_resume_workqueue = create_singlethread_workqueue("touch_resume"); 124 INIT_WORK(&touch_resume_work, touch_resume_workqueue_callback); 125 /* use fb_notifier */ 126 tpd_fb_notifier.notifier_call = tpd_fb_notifier_callback; 127 if (fb_register_client(&tpd_fb_notifier)) 128 TPD_DMESG("register fb_notifier fail!\n"); 129 /* TPD_TYPE_CAPACITIVE handle */ 130 if (touch_type == 1) { 131 132 set_bit(ABS_MT_TRACKING_ID, tpd->dev->absbit); 133 set_bit(ABS_MT_TOUCH_MAJOR, tpd->dev->absbit); 134 set_bit(ABS_MT_TOUCH_MINOR, tpd->dev->absbit); 135 set_bit(ABS_MT_POSITION_X, tpd->dev->absbit); 136 set_bit(ABS_MT_POSITION_Y, tpd->dev->absbit); 137 input_set_abs_params(tpd->dev, ABS_MT_POSITION_X, 0, TPD_RES_X, 0, 0); 138 input_set_abs_params(tpd->dev, ABS_MT_POSITION_Y, 0, TPD_RES_Y, 0, 0); 139 #if defined(CONFIG_MTK_S3320) || defined(CONFIG_MTK_S3320_47) \ 140 || defined(CONFIG_MTK_S3320_50) || defined(CONFIG_MTK_MIT200) \ 141 || defined(CONFIG_TOUCHSCREEN_SYNAPTICS_S3528) || defined(CONFIG_MTK_S7020) \ 142 || defined(CONFIG_TOUCHSCREEN_MTK_SYNAPTICS_3320_50) 143 input_set_abs_params(tpd->dev, ABS_MT_PRESSURE, 0, 255, 0, 0); 144 input_set_abs_params(tpd->dev, ABS_MT_WIDTH_MAJOR, 0, 15, 0, 0); 145 input_set_abs_params(tpd->dev, ABS_MT_WIDTH_MINOR, 0, 15, 0, 0); 146 input_mt_init_slots(tpd->dev, 10, 0); 147 #else 148 input_set_abs_params(tpd->dev, ABS_MT_TOUCH_MAJOR, 0, 100, 0, 0); 149 input_set_abs_params(tpd->dev, ABS_MT_TOUCH_MINOR, 0, 100, 0, 0); 150 #endif /* CONFIG_MTK_S3320 */ 151 TPD_DMESG("Cap touch panel driver\n"); 152 } 153 input_set_abs_params(tpd->dev, ABS_X, 0, TPD_RES_X, 0, 0); 154 input_set_abs_params(tpd->dev, ABS_Y, 0, TPD_RES_Y, 0, 0); 155 input_abs_set_res(tpd->dev, ABS_X, TPD_RES_X); 156 input_abs_set_res(tpd->dev, ABS_Y, TPD_RES_Y); 157 input_set_abs_params(tpd->dev, ABS_PRESSURE, 0, 255, 0, 0); 158 input_set_abs_params(tpd->dev, ABS_MT_TRACKING_ID, 0, 10, 0, 0); 159 160 if (input_register_device(tpd->dev)) 161 TPD_DMESG("input_register_device failed.(tpd)\n"); 162 else 163 tpd_register_flag = 1; 164 if (g_tpd_drv->tpd_have_button) 165 tpd_button_init(); 166 167 if (g_tpd_drv->attrs.num) 168 tpd_create_attributes(&pdev->dev, &g_tpd_drv->attrs); 169 170 return 0; 171 }
