Olivier Sobrie | 5c6a7a6 | 2012-03-16 23:57:09 -0700 | [diff] [blame] | 1 | #include <linux/module.h> |
| 2 | #include <linux/i2c.h> |
| 3 | #include <linux/interrupt.h> |
| 4 | #include <linux/slab.h> |
| 5 | #include <linux/input.h> |
| 6 | #include <linux/input/mt.h> |
| 7 | #include <linux/delay.h> |
| 8 | #include <linux/workqueue.h> |
| 9 | #include <linux/input/ili210x.h> |
| 10 | |
| 11 | #define MAX_TOUCHES 2 |
| 12 | #define DEFAULT_POLL_PERIOD 20 |
| 13 | |
| 14 | /* Touchscreen commands */ |
| 15 | #define REG_TOUCHDATA 0x10 |
| 16 | #define REG_PANEL_INFO 0x20 |
| 17 | #define REG_FIRMWARE_VERSION 0x40 |
| 18 | #define REG_CALIBRATE 0xcc |
| 19 | |
| 20 | struct finger { |
| 21 | u8 x_low; |
| 22 | u8 x_high; |
| 23 | u8 y_low; |
| 24 | u8 y_high; |
| 25 | } __packed; |
| 26 | |
| 27 | struct touchdata { |
| 28 | u8 status; |
| 29 | struct finger finger[MAX_TOUCHES]; |
| 30 | } __packed; |
| 31 | |
| 32 | struct panel_info { |
| 33 | struct finger finger_max; |
| 34 | u8 xchannel_num; |
| 35 | u8 ychannel_num; |
| 36 | } __packed; |
| 37 | |
| 38 | struct firmware_version { |
| 39 | u8 id; |
| 40 | u8 major; |
| 41 | u8 minor; |
| 42 | } __packed; |
| 43 | |
| 44 | struct ili210x { |
| 45 | struct i2c_client *client; |
| 46 | struct input_dev *input; |
| 47 | bool (*get_pendown_state)(void); |
| 48 | unsigned int poll_period; |
| 49 | struct delayed_work dwork; |
| 50 | }; |
| 51 | |
| 52 | static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf, |
| 53 | size_t len) |
| 54 | { |
| 55 | struct i2c_msg msg[2] = { |
| 56 | { |
| 57 | .addr = client->addr, |
| 58 | .flags = 0, |
| 59 | .len = 1, |
| 60 | .buf = ®, |
| 61 | }, |
| 62 | { |
| 63 | .addr = client->addr, |
| 64 | .flags = I2C_M_RD, |
| 65 | .len = len, |
| 66 | .buf = buf, |
| 67 | } |
| 68 | }; |
| 69 | |
| 70 | if (i2c_transfer(client->adapter, msg, 2) != 2) { |
| 71 | dev_err(&client->dev, "i2c transfer failed\n"); |
| 72 | return -EIO; |
| 73 | } |
| 74 | |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | static void ili210x_report_events(struct input_dev *input, |
| 79 | const struct touchdata *touchdata) |
| 80 | { |
| 81 | int i; |
| 82 | bool touch; |
| 83 | unsigned int x, y; |
| 84 | const struct finger *finger; |
| 85 | |
| 86 | for (i = 0; i < MAX_TOUCHES; i++) { |
| 87 | input_mt_slot(input, i); |
| 88 | |
| 89 | finger = &touchdata->finger[i]; |
| 90 | |
| 91 | touch = touchdata->status & (1 << i); |
| 92 | input_mt_report_slot_state(input, MT_TOOL_FINGER, touch); |
| 93 | if (touch) { |
| 94 | x = finger->x_low | (finger->x_high << 8); |
| 95 | y = finger->y_low | (finger->y_high << 8); |
| 96 | |
| 97 | input_report_abs(input, ABS_MT_POSITION_X, x); |
| 98 | input_report_abs(input, ABS_MT_POSITION_Y, y); |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | input_mt_report_pointer_emulation(input, false); |
| 103 | input_sync(input); |
| 104 | } |
| 105 | |
| 106 | static bool get_pendown_state(const struct ili210x *priv) |
| 107 | { |
| 108 | bool state = false; |
| 109 | |
| 110 | if (priv->get_pendown_state) |
| 111 | state = priv->get_pendown_state(); |
| 112 | |
| 113 | return state; |
| 114 | } |
| 115 | |
| 116 | static void ili210x_work(struct work_struct *work) |
| 117 | { |
| 118 | struct ili210x *priv = container_of(work, struct ili210x, |
| 119 | dwork.work); |
| 120 | struct i2c_client *client = priv->client; |
| 121 | struct touchdata touchdata; |
| 122 | int error; |
| 123 | |
| 124 | error = ili210x_read_reg(client, REG_TOUCHDATA, |
| 125 | &touchdata, sizeof(touchdata)); |
| 126 | if (error) { |
| 127 | dev_err(&client->dev, |
| 128 | "Unable to get touchdata, err = %d\n", error); |
| 129 | return; |
| 130 | } |
| 131 | |
| 132 | ili210x_report_events(priv->input, &touchdata); |
| 133 | |
| 134 | if ((touchdata.status & 0xf3) || get_pendown_state(priv)) |
| 135 | schedule_delayed_work(&priv->dwork, |
| 136 | msecs_to_jiffies(priv->poll_period)); |
| 137 | } |
| 138 | |
| 139 | static irqreturn_t ili210x_irq(int irq, void *irq_data) |
| 140 | { |
| 141 | struct ili210x *priv = irq_data; |
| 142 | |
| 143 | schedule_delayed_work(&priv->dwork, 0); |
| 144 | |
| 145 | return IRQ_HANDLED; |
| 146 | } |
| 147 | |
| 148 | static ssize_t ili210x_calibrate(struct device *dev, |
| 149 | struct device_attribute *attr, |
| 150 | const char *buf, size_t count) |
| 151 | { |
| 152 | struct i2c_client *client = to_i2c_client(dev); |
| 153 | struct ili210x *priv = i2c_get_clientdata(client); |
| 154 | unsigned long calibrate; |
| 155 | int rc; |
| 156 | u8 cmd = REG_CALIBRATE; |
| 157 | |
| 158 | if (kstrtoul(buf, 10, &calibrate)) |
| 159 | return -EINVAL; |
| 160 | |
| 161 | if (calibrate > 1) |
| 162 | return -EINVAL; |
| 163 | |
| 164 | if (calibrate) { |
| 165 | rc = i2c_master_send(priv->client, &cmd, sizeof(cmd)); |
| 166 | if (rc != sizeof(cmd)) |
| 167 | return -EIO; |
| 168 | } |
| 169 | |
| 170 | return count; |
| 171 | } |
| 172 | static DEVICE_ATTR(calibrate, 0644, NULL, ili210x_calibrate); |
| 173 | |
| 174 | static struct attribute *ili210x_attributes[] = { |
| 175 | &dev_attr_calibrate.attr, |
| 176 | NULL, |
| 177 | }; |
| 178 | |
| 179 | static const struct attribute_group ili210x_attr_group = { |
| 180 | .attrs = ili210x_attributes, |
| 181 | }; |
| 182 | |
| 183 | static int __devinit ili210x_i2c_probe(struct i2c_client *client, |
| 184 | const struct i2c_device_id *id) |
| 185 | { |
| 186 | struct device *dev = &client->dev; |
| 187 | const struct ili210x_platform_data *pdata = dev->platform_data; |
| 188 | struct ili210x *priv; |
| 189 | struct input_dev *input; |
| 190 | struct panel_info panel; |
| 191 | struct firmware_version firmware; |
| 192 | int xmax, ymax; |
| 193 | int error; |
| 194 | |
| 195 | dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver"); |
| 196 | |
| 197 | if (!pdata) { |
| 198 | dev_err(dev, "No platform data!\n"); |
| 199 | return -EINVAL; |
| 200 | } |
| 201 | |
| 202 | if (client->irq <= 0) { |
| 203 | dev_err(dev, "No IRQ!\n"); |
| 204 | return -EINVAL; |
| 205 | } |
| 206 | |
| 207 | /* Get firmware version */ |
| 208 | error = ili210x_read_reg(client, REG_FIRMWARE_VERSION, |
| 209 | &firmware, sizeof(firmware)); |
| 210 | if (error) { |
| 211 | dev_err(dev, "Failed to get firmware version, err: %d\n", |
| 212 | error); |
| 213 | return error; |
| 214 | } |
| 215 | |
| 216 | /* get panel info */ |
| 217 | error = ili210x_read_reg(client, REG_PANEL_INFO, &panel, sizeof(panel)); |
| 218 | if (error) { |
| 219 | dev_err(dev, "Failed to get panel informations, err: %d\n", |
| 220 | error); |
| 221 | return error; |
| 222 | } |
| 223 | |
| 224 | xmax = panel.finger_max.x_low | (panel.finger_max.x_high << 8); |
| 225 | ymax = panel.finger_max.y_low | (panel.finger_max.y_high << 8); |
| 226 | |
| 227 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| 228 | input = input_allocate_device(); |
| 229 | if (!priv || !input) { |
| 230 | error = -ENOMEM; |
| 231 | goto err_free_mem; |
| 232 | } |
| 233 | |
| 234 | priv->client = client; |
| 235 | priv->input = input; |
| 236 | priv->get_pendown_state = pdata->get_pendown_state; |
| 237 | priv->poll_period = pdata->poll_period ? : DEFAULT_POLL_PERIOD; |
| 238 | INIT_DELAYED_WORK(&priv->dwork, ili210x_work); |
| 239 | |
| 240 | /* Setup input device */ |
| 241 | input->name = "ILI210x Touchscreen"; |
| 242 | input->id.bustype = BUS_I2C; |
| 243 | input->dev.parent = dev; |
| 244 | |
| 245 | __set_bit(EV_SYN, input->evbit); |
| 246 | __set_bit(EV_KEY, input->evbit); |
| 247 | __set_bit(EV_ABS, input->evbit); |
| 248 | __set_bit(BTN_TOUCH, input->keybit); |
| 249 | |
| 250 | /* Single touch */ |
| 251 | input_set_abs_params(input, ABS_X, 0, xmax, 0, 0); |
| 252 | input_set_abs_params(input, ABS_Y, 0, ymax, 0, 0); |
| 253 | |
| 254 | /* Multi touch */ |
| 255 | input_mt_init_slots(input, MAX_TOUCHES); |
| 256 | input_set_abs_params(input, ABS_MT_POSITION_X, 0, xmax, 0, 0); |
| 257 | input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ymax, 0, 0); |
| 258 | |
| 259 | input_set_drvdata(input, priv); |
| 260 | i2c_set_clientdata(client, priv); |
| 261 | |
| 262 | error = request_irq(client->irq, ili210x_irq, pdata->irq_flags, |
| 263 | client->name, priv); |
| 264 | if (error) { |
| 265 | dev_err(dev, "Unable to request touchscreen IRQ, err: %d\n", |
| 266 | error); |
| 267 | goto err_free_mem; |
| 268 | } |
| 269 | |
| 270 | error = sysfs_create_group(&dev->kobj, &ili210x_attr_group); |
| 271 | if (error) { |
| 272 | dev_err(dev, "Unable to create sysfs attributes, err: %d\n", |
| 273 | error); |
| 274 | goto err_free_irq; |
| 275 | } |
| 276 | |
| 277 | error = input_register_device(priv->input); |
| 278 | if (error) { |
| 279 | dev_err(dev, "Cannot regiser input device, err: %d\n", error); |
| 280 | goto err_remove_sysfs; |
| 281 | } |
| 282 | |
| 283 | device_init_wakeup(&client->dev, 1); |
| 284 | |
| 285 | dev_dbg(dev, |
| 286 | "ILI210x initialized (IRQ: %d), firmware version %d.%d.%d", |
| 287 | client->irq, firmware.id, firmware.major, firmware.minor); |
| 288 | |
| 289 | return 0; |
| 290 | |
| 291 | err_remove_sysfs: |
| 292 | sysfs_remove_group(&dev->kobj, &ili210x_attr_group); |
| 293 | err_free_irq: |
| 294 | free_irq(client->irq, priv); |
| 295 | err_free_mem: |
| 296 | input_free_device(input); |
| 297 | kfree(priv); |
| 298 | return error; |
| 299 | } |
| 300 | |
| 301 | static int __devexit ili210x_i2c_remove(struct i2c_client *client) |
| 302 | { |
| 303 | struct ili210x *priv = i2c_get_clientdata(client); |
| 304 | |
| 305 | sysfs_remove_group(&client->dev.kobj, &ili210x_attr_group); |
| 306 | free_irq(priv->client->irq, priv); |
| 307 | cancel_delayed_work_sync(&priv->dwork); |
| 308 | input_unregister_device(priv->input); |
| 309 | kfree(priv); |
| 310 | |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | #ifdef CONFIG_PM_SLEEP |
| 315 | static int ili210x_i2c_suspend(struct device *dev) |
| 316 | { |
| 317 | struct i2c_client *client = to_i2c_client(dev); |
| 318 | |
| 319 | if (device_may_wakeup(&client->dev)) |
| 320 | enable_irq_wake(client->irq); |
| 321 | |
| 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | static int ili210x_i2c_resume(struct device *dev) |
| 326 | { |
| 327 | struct i2c_client *client = to_i2c_client(dev); |
| 328 | |
| 329 | if (device_may_wakeup(&client->dev)) |
| 330 | disable_irq_wake(client->irq); |
| 331 | |
| 332 | return 0; |
| 333 | } |
| 334 | #endif |
| 335 | |
| 336 | static SIMPLE_DEV_PM_OPS(ili210x_i2c_pm, |
| 337 | ili210x_i2c_suspend, ili210x_i2c_resume); |
| 338 | |
| 339 | static const struct i2c_device_id ili210x_i2c_id[] = { |
| 340 | { "ili210x", 0 }, |
| 341 | { } |
| 342 | }; |
| 343 | MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id); |
| 344 | |
| 345 | static struct i2c_driver ili210x_ts_driver = { |
| 346 | .driver = { |
| 347 | .name = "ili210x_i2c", |
| 348 | .owner = THIS_MODULE, |
| 349 | .pm = &ili210x_i2c_pm, |
| 350 | }, |
| 351 | .id_table = ili210x_i2c_id, |
| 352 | .probe = ili210x_i2c_probe, |
| 353 | .remove = __devexit_p(ili210x_i2c_remove), |
| 354 | }; |
| 355 | |
| 356 | module_i2c_driver(ili210x_ts_driver); |
| 357 | |
| 358 | MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>"); |
| 359 | MODULE_DESCRIPTION("ILI210X I2C Touchscreen Driver"); |
| 360 | MODULE_LICENSE("GPL"); |