Bo Shen | bd7e4e8 | 2011-03-13 23:34:59 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Atmel AT42QT1070 QTouch Sensor Controller |
| 3 | * |
| 4 | * Copyright (C) 2011 Atmel |
| 5 | * |
| 6 | * Authors: Bo Shen <voice.shen@atmel.com> |
| 7 | * |
| 8 | * Base on AT42QT2160 driver by: |
| 9 | * Raphael Derosso Pereira <raphaelpereira@gmail.com> |
| 10 | * Copyright (C) 2009 |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with this program; if not, write to the Free Software |
| 24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 25 | */ |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/i2c.h> |
| 30 | #include <linux/input.h> |
| 31 | #include <linux/slab.h> |
| 32 | #include <linux/irq.h> |
| 33 | #include <linux/interrupt.h> |
| 34 | #include <linux/jiffies.h> |
| 35 | #include <linux/delay.h> |
| 36 | |
| 37 | /* Address for each register */ |
| 38 | #define CHIP_ID 0x00 |
| 39 | #define QT1070_CHIP_ID 0x2E |
| 40 | |
| 41 | #define FW_VERSION 0x01 |
| 42 | #define QT1070_FW_VERSION 0x15 |
| 43 | |
| 44 | #define DET_STATUS 0x02 |
| 45 | |
| 46 | #define KEY_STATUS 0x03 |
| 47 | |
| 48 | /* Calibrate */ |
| 49 | #define CALIBRATE_CMD 0x38 |
| 50 | #define QT1070_CAL_TIME 200 |
| 51 | |
| 52 | /* Reset */ |
| 53 | #define RESET 0x39 |
| 54 | #define QT1070_RESET_TIME 255 |
| 55 | |
| 56 | /* AT42QT1070 support up to 7 keys */ |
| 57 | static const unsigned short qt1070_key2code[] = { |
| 58 | KEY_0, KEY_1, KEY_2, KEY_3, |
| 59 | KEY_4, KEY_5, KEY_6, |
| 60 | }; |
| 61 | |
| 62 | struct qt1070_data { |
| 63 | struct i2c_client *client; |
| 64 | struct input_dev *input; |
| 65 | unsigned int irq; |
| 66 | unsigned short keycodes[ARRAY_SIZE(qt1070_key2code)]; |
| 67 | u8 last_keys; |
| 68 | }; |
| 69 | |
| 70 | static int qt1070_read(struct i2c_client *client, u8 reg) |
| 71 | { |
| 72 | int ret; |
| 73 | |
| 74 | ret = i2c_smbus_read_byte_data(client, reg); |
| 75 | if (ret < 0) |
| 76 | dev_err(&client->dev, |
| 77 | "can not read register, returned %d\n", ret); |
| 78 | |
| 79 | return ret; |
| 80 | } |
| 81 | |
| 82 | static int qt1070_write(struct i2c_client *client, u8 reg, u8 data) |
| 83 | { |
| 84 | int ret; |
| 85 | |
| 86 | ret = i2c_smbus_write_byte_data(client, reg, data); |
| 87 | if (ret < 0) |
| 88 | dev_err(&client->dev, |
| 89 | "can not write register, returned %d\n", ret); |
| 90 | |
| 91 | return ret; |
| 92 | } |
| 93 | |
| 94 | static bool __devinit qt1070_identify(struct i2c_client *client) |
| 95 | { |
| 96 | int id, ver; |
| 97 | |
| 98 | /* Read Chip ID */ |
| 99 | id = qt1070_read(client, CHIP_ID); |
| 100 | if (id != QT1070_CHIP_ID) { |
| 101 | dev_err(&client->dev, "ID %d not supported\n", id); |
| 102 | return false; |
| 103 | } |
| 104 | |
| 105 | /* Read firmware version */ |
| 106 | ver = qt1070_read(client, FW_VERSION); |
| 107 | if (ver < 0) { |
| 108 | dev_err(&client->dev, "could not read the firmware version\n"); |
| 109 | return false; |
| 110 | } |
| 111 | |
| 112 | dev_info(&client->dev, "AT42QT1070 firmware version %x\n", ver); |
| 113 | |
| 114 | return true; |
| 115 | } |
| 116 | |
| 117 | static irqreturn_t qt1070_interrupt(int irq, void *dev_id) |
| 118 | { |
| 119 | struct qt1070_data *data = dev_id; |
| 120 | struct i2c_client *client = data->client; |
| 121 | struct input_dev *input = data->input; |
| 122 | int i; |
| 123 | u8 new_keys, keyval, mask = 0x01; |
| 124 | |
| 125 | /* Read the detected status register, thus clearing interrupt */ |
| 126 | qt1070_read(client, DET_STATUS); |
| 127 | |
| 128 | /* Read which key changed */ |
| 129 | new_keys = qt1070_read(client, KEY_STATUS); |
| 130 | |
| 131 | for (i = 0; i < ARRAY_SIZE(qt1070_key2code); i++) { |
| 132 | keyval = new_keys & mask; |
| 133 | if ((data->last_keys & mask) != keyval) |
| 134 | input_report_key(input, data->keycodes[i], keyval); |
| 135 | mask <<= 1; |
| 136 | } |
| 137 | input_sync(input); |
| 138 | |
| 139 | data->last_keys = new_keys; |
| 140 | return IRQ_HANDLED; |
| 141 | } |
| 142 | |
| 143 | static int __devinit qt1070_probe(struct i2c_client *client, |
| 144 | const struct i2c_device_id *id) |
| 145 | { |
| 146 | struct qt1070_data *data; |
| 147 | struct input_dev *input; |
| 148 | int i; |
| 149 | int err; |
| 150 | |
| 151 | err = i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE); |
| 152 | if (!err) { |
| 153 | dev_err(&client->dev, "%s adapter not supported\n", |
| 154 | dev_driver_string(&client->adapter->dev)); |
| 155 | return -ENODEV; |
| 156 | } |
| 157 | |
| 158 | if (!client->irq) { |
| 159 | dev_err(&client->dev, "please assign the irq to this device\n"); |
| 160 | return -EINVAL; |
| 161 | } |
| 162 | |
| 163 | /* Identify the qt1070 chip */ |
| 164 | if (!qt1070_identify(client)) |
| 165 | return -ENODEV; |
| 166 | |
| 167 | data = kzalloc(sizeof(struct qt1070_data), GFP_KERNEL); |
| 168 | input = input_allocate_device(); |
| 169 | if (!data || !input) { |
| 170 | dev_err(&client->dev, "insufficient memory\n"); |
| 171 | err = -ENOMEM; |
| 172 | goto err_free_mem; |
| 173 | } |
| 174 | |
| 175 | data->client = client; |
| 176 | data->input = input; |
| 177 | data->irq = client->irq; |
| 178 | |
| 179 | input->name = "AT42QT1070 QTouch Sensor"; |
| 180 | input->dev.parent = &client->dev; |
| 181 | input->id.bustype = BUS_I2C; |
| 182 | |
| 183 | /* Add the keycode */ |
| 184 | input->keycode = data->keycodes; |
| 185 | input->keycodesize = sizeof(data->keycodes[0]); |
| 186 | input->keycodemax = ARRAY_SIZE(qt1070_key2code); |
| 187 | |
| 188 | __set_bit(EV_KEY, input->evbit); |
| 189 | |
| 190 | for (i = 0; i < ARRAY_SIZE(qt1070_key2code); i++) { |
| 191 | data->keycodes[i] = qt1070_key2code[i]; |
| 192 | __set_bit(qt1070_key2code[i], input->keybit); |
| 193 | } |
| 194 | |
| 195 | /* Calibrate device */ |
| 196 | qt1070_write(client, CALIBRATE_CMD, 1); |
| 197 | msleep(QT1070_CAL_TIME); |
| 198 | |
| 199 | /* Soft reset */ |
| 200 | qt1070_write(client, RESET, 1); |
| 201 | msleep(QT1070_RESET_TIME); |
| 202 | |
| 203 | err = request_threaded_irq(client->irq, NULL, qt1070_interrupt, |
Lars-Peter Clausen | 9b7e31b | 2012-07-04 13:02:56 -0700 | [diff] [blame] | 204 | IRQF_TRIGGER_NONE | IRQF_ONESHOT, |
| 205 | client->dev.driver->name, data); |
Bo Shen | bd7e4e8 | 2011-03-13 23:34:59 -0700 | [diff] [blame] | 206 | if (err) { |
| 207 | dev_err(&client->dev, "fail to request irq\n"); |
| 208 | goto err_free_mem; |
| 209 | } |
| 210 | |
| 211 | /* Register the input device */ |
| 212 | err = input_register_device(data->input); |
| 213 | if (err) { |
| 214 | dev_err(&client->dev, "Failed to register input device\n"); |
| 215 | goto err_free_irq; |
| 216 | } |
| 217 | |
| 218 | i2c_set_clientdata(client, data); |
| 219 | |
| 220 | /* Read to clear the chang line */ |
| 221 | qt1070_read(client, DET_STATUS); |
| 222 | |
| 223 | return 0; |
| 224 | |
| 225 | err_free_irq: |
| 226 | free_irq(client->irq, data); |
| 227 | err_free_mem: |
| 228 | input_free_device(input); |
| 229 | kfree(data); |
| 230 | return err; |
| 231 | } |
| 232 | |
| 233 | static int __devexit qt1070_remove(struct i2c_client *client) |
| 234 | { |
| 235 | struct qt1070_data *data = i2c_get_clientdata(client); |
| 236 | |
| 237 | /* Release IRQ */ |
| 238 | free_irq(client->irq, data); |
| 239 | |
| 240 | input_unregister_device(data->input); |
| 241 | kfree(data); |
| 242 | |
Bo Shen | bd7e4e8 | 2011-03-13 23:34:59 -0700 | [diff] [blame] | 243 | return 0; |
| 244 | } |
| 245 | |
| 246 | static const struct i2c_device_id qt1070_id[] = { |
| 247 | { "qt1070", 0 }, |
| 248 | { }, |
| 249 | }; |
Axel Lin | 94bb530 | 2011-04-27 21:39:20 -0700 | [diff] [blame] | 250 | MODULE_DEVICE_TABLE(i2c, qt1070_id); |
Bo Shen | bd7e4e8 | 2011-03-13 23:34:59 -0700 | [diff] [blame] | 251 | |
| 252 | static struct i2c_driver qt1070_driver = { |
| 253 | .driver = { |
| 254 | .name = "qt1070", |
| 255 | .owner = THIS_MODULE, |
| 256 | }, |
| 257 | .id_table = qt1070_id, |
| 258 | .probe = qt1070_probe, |
| 259 | .remove = __devexit_p(qt1070_remove), |
| 260 | }; |
| 261 | |
Axel Lin | 1b92c1c | 2012-03-16 23:05:41 -0700 | [diff] [blame] | 262 | module_i2c_driver(qt1070_driver); |
Bo Shen | bd7e4e8 | 2011-03-13 23:34:59 -0700 | [diff] [blame] | 263 | |
| 264 | MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>"); |
| 265 | MODULE_DESCRIPTION("Driver for AT42QT1070 QTouch sensor"); |
| 266 | MODULE_LICENSE("GPL"); |