1 /* 2 * Driver for Pixcir I2C touchscreen controllers. 3 * 4 * Copyright (C) 2010-2011 Pixcir, Inc. 5 * 6 * This software is licensed under the terms of the GNU General Public 7 * License version 2, as published by the Free Software Foundation, and 8 * may be copied, distributed, and modified under those terms. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public 16 * License along with this library; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 20 #include <linux/delay.h> 21 #include <linux/module.h> 22 #include <linux/interrupt.h> 23 #include <linux/slab.h> 24 #include <linux/i2c.h> 25 #include <linux/input.h> 26 #include <linux/input/pixcir_ts.h> 27 28 struct pixcir_i2c_ts_data { 29 struct i2c_client *client; 30 struct input_dev *input; 31 const struct pixcir_ts_platform_data *chip; 32 bool exiting; 33 }; 34 35 static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data *data) 36 { 37 struct pixcir_i2c_ts_data *tsdata = data; 38 u8 rdbuf[10], wrbuf[1] = { 0 }; 39 u8 touch; 40 int ret; 41 42 ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf)); 43 if (ret != sizeof(wrbuf)) { 44 dev_err(&tsdata->client->dev, 45 "%s: i2c_master_send failed(), ret=%d\n", 46 __func__, ret); 47 return; 48 } 49 50 ret = i2c_master_recv(tsdata->client, rdbuf, sizeof(rdbuf)); 51 if (ret != sizeof(rdbuf)) { 52 dev_err(&tsdata->client->dev, 53 "%s: i2c_master_recv failed(), ret=%d\n", 54 __func__, ret); 55 return; 56 } 57 58 touch = rdbuf[0]; 59 if (touch) { 60 u16 posx1 = (rdbuf[3] << 8) | rdbuf[2]; 61 u16 posy1 = (rdbuf[5] << 8) | rdbuf[4]; 62 u16 posx2 = (rdbuf[7] << 8) | rdbuf[6]; 63 u16 posy2 = (rdbuf[9] << 8) | rdbuf[8]; 64 65 input_report_key(tsdata->input, BTN_TOUCH, 1); 66 input_report_abs(tsdata->input, ABS_X, posx1); 67 input_report_abs(tsdata->input, ABS_Y, posy1); 68 69 input_report_abs(tsdata->input, ABS_MT_POSITION_X, posx1); 70 input_report_abs(tsdata->input, ABS_MT_POSITION_Y, posy1); 71 input_mt_sync(tsdata->input); 72 73 if (touch == 2) { 74 input_report_abs(tsdata->input, 75 ABS_MT_POSITION_X, posx2); 76 input_report_abs(tsdata->input, 77 ABS_MT_POSITION_Y, posy2); 78 input_mt_sync(tsdata->input); 79 } 80 } else { 81 input_report_key(tsdata->input, BTN_TOUCH, 0); 82 } 83 84 input_sync(tsdata->input); 85 } 86 87 static irqreturn_t pixcir_ts_isr(int irq, void *dev_id) 88 { 89 struct pixcir_i2c_ts_data *tsdata = dev_id; 90 91 while (!tsdata->exiting) { 92 pixcir_ts_poscheck(tsdata); 93 94 if (tsdata->chip->attb_read_val()) 95 break; 96 97 msleep(20); 98 } 99 100 return IRQ_HANDLED; 101 } 102 103 #ifdef CONFIG_PM_SLEEP 104 static int pixcir_i2c_ts_suspend(struct device *dev) 105 { 106 struct i2c_client *client = to_i2c_client(dev); 107 108 if (device_may_wakeup(&client->dev)) 109 enable_irq_wake(client->irq); 110 111 return 0; 112 } 113 114 static int pixcir_i2c_ts_resume(struct device *dev) 115 { 116 struct i2c_client *client = to_i2c_client(dev); 117 118 if (device_may_wakeup(&client->dev)) 119 disable_irq_wake(client->irq); 120 121 return 0; 122 } 123 #endif 124 125 static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops, 126 pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume); 127 128 static int pixcir_i2c_ts_probe(struct i2c_client *client, 129 const struct i2c_device_id *id) 130 { 131 const struct pixcir_ts_platform_data *pdata = client->dev.platform_data; 132 struct pixcir_i2c_ts_data *tsdata; 133 struct input_dev *input; 134 int error; 135 136 if (!pdata) { 137 dev_err(&client->dev, "platform data not defined\n"); 138 return -EINVAL; 139 } 140 141 tsdata = kzalloc(sizeof(*tsdata), GFP_KERNEL); 142 input = input_allocate_device(); 143 if (!tsdata || !input) { 144 dev_err(&client->dev, "Failed to allocate driver data!\n"); 145 error = -ENOMEM; 146 goto err_free_mem; 147 } 148 149 tsdata->client = client; 150 tsdata->input = input; 151 tsdata->chip = pdata; 152 153 input->name = client->name; 154 input->id.bustype = BUS_I2C; 155 input->dev.parent = &client->dev; 156 157 __set_bit(EV_KEY, input->evbit); 158 __set_bit(EV_ABS, input->evbit); 159 __set_bit(BTN_TOUCH, input->keybit); 160 input_set_abs_params(input, ABS_X, 0, pdata->x_max, 0, 0); 161 input_set_abs_params(input, ABS_Y, 0, pdata->y_max, 0, 0); 162 input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0); 163 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0); 164 165 input_set_drvdata(input, tsdata); 166 167 error = request_threaded_irq(client->irq, NULL, pixcir_ts_isr, 168 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 169 client->name, tsdata); 170 if (error) { 171 dev_err(&client->dev, "Unable to request touchscreen IRQ.\n"); 172 goto err_free_mem; 173 } 174 175 error = input_register_device(input); 176 if (error) 177 goto err_free_irq; 178 179 i2c_set_clientdata(client, tsdata); 180 device_init_wakeup(&client->dev, 1); 181 182 return 0; 183 184 err_free_irq: 185 free_irq(client->irq, tsdata); 186 err_free_mem: 187 input_free_device(input); 188 kfree(tsdata); 189 return error; 190 } 191 192 static int pixcir_i2c_ts_remove(struct i2c_client *client) 193 { 194 struct pixcir_i2c_ts_data *tsdata = i2c_get_clientdata(client); 195 196 device_init_wakeup(&client->dev, 0); 197 198 tsdata->exiting = true; 199 mb(); 200 free_irq(client->irq, tsdata); 201 202 input_unregister_device(tsdata->input); 203 kfree(tsdata); 204 205 return 0; 206 } 207 208 static const struct i2c_device_id pixcir_i2c_ts_id[] = { 209 { "pixcir_ts", 0 }, 210 { } 211 }; 212 MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id); 213 214 static struct i2c_driver pixcir_i2c_ts_driver = { 215 .driver = { 216 .owner = THIS_MODULE, 217 .name = "pixcir_ts", 218 .pm = &pixcir_dev_pm_ops, 219 }, 220 .probe = pixcir_i2c_ts_probe, 221 .remove = pixcir_i2c_ts_remove, 222 .id_table = pixcir_i2c_ts_id, 223 }; 224 225 module_i2c_driver(pixcir_i2c_ts_driver); 226 227 MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>"); 228 MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver"); 229 MODULE_LICENSE("GPL"); 230