Tony SIM | 56a8bd6 | 2010-12-15 23:39:25 -0800 | [diff] [blame] | 1 | /* |
| 2 | * ST1232 Touchscreen Controller Driver |
| 3 | * |
| 4 | * Copyright (C) 2010 Renesas Solutions Corp. |
| 5 | * Tony SIM <chinyeow.sim.xt@renesas.com> |
| 6 | * |
| 7 | * Using code from: |
| 8 | * - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c |
| 9 | * Copyright (C) 2007 Google, Inc. |
| 10 | * |
| 11 | * This software is licensed under the terms of the GNU General Public |
| 12 | * License version 2, as published by the Free Software Foundation, and |
| 13 | * may be copied, distributed, and modified under those terms. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/i2c.h> |
| 23 | #include <linux/input.h> |
| 24 | #include <linux/interrupt.h> |
| 25 | #include <linux/module.h> |
Rafael J. Wysocki | 9ee27ff | 2011-12-23 01:24:25 +0100 | [diff] [blame] | 26 | #include <linux/pm_qos.h> |
Tony SIM | 56a8bd6 | 2010-12-15 23:39:25 -0800 | [diff] [blame] | 27 | #include <linux/slab.h> |
| 28 | #include <linux/types.h> |
| 29 | |
| 30 | #define ST1232_TS_NAME "st1232-ts" |
| 31 | |
| 32 | #define MIN_X 0x00 |
| 33 | #define MIN_Y 0x00 |
| 34 | #define MAX_X 0x31f /* (800 - 1) */ |
| 35 | #define MAX_Y 0x1df /* (480 - 1) */ |
| 36 | #define MAX_AREA 0xff |
| 37 | #define MAX_FINGERS 2 |
| 38 | |
| 39 | struct st1232_ts_finger { |
| 40 | u16 x; |
| 41 | u16 y; |
| 42 | u8 t; |
| 43 | bool is_valid; |
| 44 | }; |
| 45 | |
| 46 | struct st1232_ts_data { |
| 47 | struct i2c_client *client; |
| 48 | struct input_dev *input_dev; |
| 49 | struct st1232_ts_finger finger[MAX_FINGERS]; |
Rafael J. Wysocki | 9ee27ff | 2011-12-23 01:24:25 +0100 | [diff] [blame] | 50 | struct dev_pm_qos_request low_latency_req; |
Tony SIM | 56a8bd6 | 2010-12-15 23:39:25 -0800 | [diff] [blame] | 51 | }; |
| 52 | |
| 53 | static int st1232_ts_read_data(struct st1232_ts_data *ts) |
| 54 | { |
| 55 | struct st1232_ts_finger *finger = ts->finger; |
| 56 | struct i2c_client *client = ts->client; |
| 57 | struct i2c_msg msg[2]; |
| 58 | int error; |
| 59 | u8 start_reg; |
| 60 | u8 buf[10]; |
| 61 | |
| 62 | /* read touchscreen data from ST1232 */ |
| 63 | msg[0].addr = client->addr; |
| 64 | msg[0].flags = 0; |
| 65 | msg[0].len = 1; |
| 66 | msg[0].buf = &start_reg; |
| 67 | start_reg = 0x10; |
| 68 | |
| 69 | msg[1].addr = ts->client->addr; |
| 70 | msg[1].flags = I2C_M_RD; |
| 71 | msg[1].len = sizeof(buf); |
| 72 | msg[1].buf = buf; |
| 73 | |
| 74 | error = i2c_transfer(client->adapter, msg, 2); |
| 75 | if (error < 0) |
| 76 | return error; |
| 77 | |
| 78 | /* get "valid" bits */ |
| 79 | finger[0].is_valid = buf[2] >> 7; |
| 80 | finger[1].is_valid = buf[5] >> 7; |
| 81 | |
| 82 | /* get xy coordinate */ |
| 83 | if (finger[0].is_valid) { |
| 84 | finger[0].x = ((buf[2] & 0x0070) << 4) | buf[3]; |
| 85 | finger[0].y = ((buf[2] & 0x0007) << 8) | buf[4]; |
| 86 | finger[0].t = buf[8]; |
| 87 | } |
| 88 | |
| 89 | if (finger[1].is_valid) { |
| 90 | finger[1].x = ((buf[5] & 0x0070) << 4) | buf[6]; |
| 91 | finger[1].y = ((buf[5] & 0x0007) << 8) | buf[7]; |
| 92 | finger[1].t = buf[9]; |
| 93 | } |
| 94 | |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id) |
| 99 | { |
| 100 | struct st1232_ts_data *ts = dev_id; |
| 101 | struct st1232_ts_finger *finger = ts->finger; |
| 102 | struct input_dev *input_dev = ts->input_dev; |
| 103 | int count = 0; |
| 104 | int i, ret; |
| 105 | |
| 106 | ret = st1232_ts_read_data(ts); |
| 107 | if (ret < 0) |
| 108 | goto end; |
| 109 | |
| 110 | /* multi touch protocol */ |
| 111 | for (i = 0; i < MAX_FINGERS; i++) { |
| 112 | if (!finger[i].is_valid) |
| 113 | continue; |
| 114 | |
| 115 | input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t); |
| 116 | input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x); |
| 117 | input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y); |
| 118 | input_mt_sync(input_dev); |
| 119 | count++; |
| 120 | } |
| 121 | |
| 122 | /* SYN_MT_REPORT only if no contact */ |
Rafael J. Wysocki | 9ee27ff | 2011-12-23 01:24:25 +0100 | [diff] [blame] | 123 | if (!count) { |
Tony SIM | 56a8bd6 | 2010-12-15 23:39:25 -0800 | [diff] [blame] | 124 | input_mt_sync(input_dev); |
Rafael J. Wysocki | 9ee27ff | 2011-12-23 01:24:25 +0100 | [diff] [blame] | 125 | if (ts->low_latency_req.dev) { |
| 126 | dev_pm_qos_remove_request(&ts->low_latency_req); |
| 127 | ts->low_latency_req.dev = NULL; |
| 128 | } |
| 129 | } else if (!ts->low_latency_req.dev) { |
| 130 | /* First contact, request 100 us latency. */ |
| 131 | dev_pm_qos_add_ancestor_request(&ts->client->dev, |
| 132 | &ts->low_latency_req, 100); |
| 133 | } |
Tony SIM | 56a8bd6 | 2010-12-15 23:39:25 -0800 | [diff] [blame] | 134 | |
| 135 | /* SYN_REPORT */ |
| 136 | input_sync(input_dev); |
| 137 | |
| 138 | end: |
| 139 | return IRQ_HANDLED; |
| 140 | } |
| 141 | |
| 142 | static int __devinit st1232_ts_probe(struct i2c_client *client, |
| 143 | const struct i2c_device_id *id) |
| 144 | { |
| 145 | struct st1232_ts_data *ts; |
| 146 | struct input_dev *input_dev; |
| 147 | int error; |
| 148 | |
| 149 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
| 150 | dev_err(&client->dev, "need I2C_FUNC_I2C\n"); |
| 151 | return -EIO; |
| 152 | } |
| 153 | |
| 154 | if (!client->irq) { |
| 155 | dev_err(&client->dev, "no IRQ?\n"); |
| 156 | return -EINVAL; |
| 157 | } |
| 158 | |
| 159 | |
| 160 | ts = kzalloc(sizeof(struct st1232_ts_data), GFP_KERNEL); |
| 161 | input_dev = input_allocate_device(); |
| 162 | if (!ts || !input_dev) { |
| 163 | error = -ENOMEM; |
| 164 | goto err_free_mem; |
| 165 | } |
| 166 | |
| 167 | ts->client = client; |
| 168 | ts->input_dev = input_dev; |
| 169 | |
| 170 | input_dev->name = "st1232-touchscreen"; |
| 171 | input_dev->id.bustype = BUS_I2C; |
| 172 | input_dev->dev.parent = &client->dev; |
| 173 | |
| 174 | __set_bit(EV_SYN, input_dev->evbit); |
| 175 | __set_bit(EV_KEY, input_dev->evbit); |
| 176 | __set_bit(EV_ABS, input_dev->evbit); |
| 177 | |
| 178 | input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0); |
| 179 | input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0); |
| 180 | input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0); |
| 181 | |
| 182 | error = request_threaded_irq(client->irq, NULL, st1232_ts_irq_handler, |
| 183 | IRQF_ONESHOT, client->name, ts); |
| 184 | if (error) { |
| 185 | dev_err(&client->dev, "Failed to register interrupt\n"); |
| 186 | goto err_free_mem; |
| 187 | } |
| 188 | |
| 189 | error = input_register_device(ts->input_dev); |
| 190 | if (error) { |
| 191 | dev_err(&client->dev, "Unable to register %s input device\n", |
| 192 | input_dev->name); |
| 193 | goto err_free_irq; |
| 194 | } |
| 195 | |
| 196 | i2c_set_clientdata(client, ts); |
| 197 | device_init_wakeup(&client->dev, 1); |
| 198 | |
| 199 | return 0; |
| 200 | |
| 201 | err_free_irq: |
| 202 | free_irq(client->irq, ts); |
| 203 | err_free_mem: |
| 204 | input_free_device(input_dev); |
| 205 | kfree(ts); |
| 206 | return error; |
| 207 | } |
| 208 | |
| 209 | static int __devexit st1232_ts_remove(struct i2c_client *client) |
| 210 | { |
| 211 | struct st1232_ts_data *ts = i2c_get_clientdata(client); |
| 212 | |
| 213 | device_init_wakeup(&client->dev, 0); |
| 214 | free_irq(client->irq, ts); |
| 215 | input_unregister_device(ts->input_dev); |
| 216 | kfree(ts); |
| 217 | |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | #ifdef CONFIG_PM |
| 222 | static int st1232_ts_suspend(struct device *dev) |
| 223 | { |
| 224 | struct i2c_client *client = to_i2c_client(dev); |
| 225 | |
| 226 | if (device_may_wakeup(&client->dev)) |
| 227 | enable_irq_wake(client->irq); |
| 228 | else |
| 229 | disable_irq(client->irq); |
| 230 | |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | static int st1232_ts_resume(struct device *dev) |
| 235 | { |
| 236 | struct i2c_client *client = to_i2c_client(dev); |
| 237 | |
| 238 | if (device_may_wakeup(&client->dev)) |
| 239 | disable_irq_wake(client->irq); |
| 240 | else |
| 241 | enable_irq(client->irq); |
| 242 | |
| 243 | return 0; |
| 244 | } |
| 245 | |
| 246 | static const struct dev_pm_ops st1232_ts_pm_ops = { |
| 247 | .suspend = st1232_ts_suspend, |
| 248 | .resume = st1232_ts_resume, |
| 249 | }; |
| 250 | #endif |
| 251 | |
| 252 | static const struct i2c_device_id st1232_ts_id[] = { |
| 253 | { ST1232_TS_NAME, 0 }, |
| 254 | { } |
| 255 | }; |
| 256 | MODULE_DEVICE_TABLE(i2c, st1232_ts_id); |
| 257 | |
| 258 | static struct i2c_driver st1232_ts_driver = { |
| 259 | .probe = st1232_ts_probe, |
| 260 | .remove = __devexit_p(st1232_ts_remove), |
| 261 | .id_table = st1232_ts_id, |
| 262 | .driver = { |
| 263 | .name = ST1232_TS_NAME, |
| 264 | .owner = THIS_MODULE, |
| 265 | #ifdef CONFIG_PM |
| 266 | .pm = &st1232_ts_pm_ops, |
| 267 | #endif |
| 268 | }, |
| 269 | }; |
| 270 | |
| 271 | static int __init st1232_ts_init(void) |
| 272 | { |
| 273 | return i2c_add_driver(&st1232_ts_driver); |
| 274 | } |
| 275 | module_init(st1232_ts_init); |
| 276 | |
| 277 | static void __exit st1232_ts_exit(void) |
| 278 | { |
| 279 | i2c_del_driver(&st1232_ts_driver); |
| 280 | } |
| 281 | module_exit(st1232_ts_exit); |
| 282 | |
| 283 | MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>"); |
| 284 | MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver"); |
| 285 | MODULE_LICENSE("GPL"); |