Jianchun Bian | 36a281e | 2011-12-30 15:16:21 -0800 | [diff] [blame] | 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 __devinit 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, |
| 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 __devexit 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 = __devexit_p(pixcir_i2c_ts_remove), |
| 222 | .id_table = pixcir_i2c_ts_id, |
| 223 | }; |
| 224 | |
| 225 | static int __init pixcir_i2c_ts_init(void) |
| 226 | { |
| 227 | return i2c_add_driver(&pixcir_i2c_ts_driver); |
| 228 | } |
| 229 | module_init(pixcir_i2c_ts_init); |
| 230 | |
| 231 | static void __exit pixcir_i2c_ts_exit(void) |
| 232 | { |
| 233 | i2c_del_driver(&pixcir_i2c_ts_driver); |
| 234 | } |
| 235 | module_exit(pixcir_i2c_ts_exit); |
| 236 | |
| 237 | MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>"); |
| 238 | MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver"); |
| 239 | MODULE_LICENSE("GPL"); |