1/* 2 * mcs5000_ts.c - Touchscreen driver for MELFAS MCS-5000 controller 3 * 4 * Copyright (C) 2009 Samsung Electronics Co.Ltd 5 * Author: Joonyoung Shim <jy0922.shim@samsung.com> 6 * 7 * Based on wm97xx-core.c 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 */ 15 16#include <linux/module.h> 17#include <linux/init.h> 18#include <linux/i2c.h> 19#include <linux/i2c/mcs.h> 20#include <linux/interrupt.h> 21#include <linux/input.h> 22#include <linux/irq.h> 23#include <linux/slab.h> 24 25/* Registers */ 26#define MCS5000_TS_STATUS 0x00 27#define STATUS_OFFSET 0 28#define STATUS_NO (0 << STATUS_OFFSET) 29#define STATUS_INIT (1 << STATUS_OFFSET) 30#define STATUS_SENSING (2 << STATUS_OFFSET) 31#define STATUS_COORD (3 << STATUS_OFFSET) 32#define STATUS_GESTURE (4 << STATUS_OFFSET) 33#define ERROR_OFFSET 4 34#define ERROR_NO (0 << ERROR_OFFSET) 35#define ERROR_POWER_ON_RESET (1 << ERROR_OFFSET) 36#define ERROR_INT_RESET (2 << ERROR_OFFSET) 37#define ERROR_EXT_RESET (3 << ERROR_OFFSET) 38#define ERROR_INVALID_REG_ADDRESS (8 << ERROR_OFFSET) 39#define ERROR_INVALID_REG_VALUE (9 << ERROR_OFFSET) 40 41#define MCS5000_TS_OP_MODE 0x01 42#define RESET_OFFSET 0 43#define RESET_NO (0 << RESET_OFFSET) 44#define RESET_EXT_SOFT (1 << RESET_OFFSET) 45#define OP_MODE_OFFSET 1 46#define OP_MODE_SLEEP (0 << OP_MODE_OFFSET) 47#define OP_MODE_ACTIVE (1 << OP_MODE_OFFSET) 48#define GESTURE_OFFSET 4 49#define GESTURE_DISABLE (0 << GESTURE_OFFSET) 50#define GESTURE_ENABLE (1 << GESTURE_OFFSET) 51#define PROXIMITY_OFFSET 5 52#define PROXIMITY_DISABLE (0 << PROXIMITY_OFFSET) 53#define PROXIMITY_ENABLE (1 << PROXIMITY_OFFSET) 54#define SCAN_MODE_OFFSET 6 55#define SCAN_MODE_INTERRUPT (0 << SCAN_MODE_OFFSET) 56#define SCAN_MODE_POLLING (1 << SCAN_MODE_OFFSET) 57#define REPORT_RATE_OFFSET 7 58#define REPORT_RATE_40 (0 << REPORT_RATE_OFFSET) 59#define REPORT_RATE_80 (1 << REPORT_RATE_OFFSET) 60 61#define MCS5000_TS_SENS_CTL 0x02 62#define MCS5000_TS_FILTER_CTL 0x03 63#define PRI_FILTER_OFFSET 0 64#define SEC_FILTER_OFFSET 4 65 66#define MCS5000_TS_X_SIZE_UPPER 0x08 67#define MCS5000_TS_X_SIZE_LOWER 0x09 68#define MCS5000_TS_Y_SIZE_UPPER 0x0A 69#define MCS5000_TS_Y_SIZE_LOWER 0x0B 70 71#define MCS5000_TS_INPUT_INFO 0x10 72#define INPUT_TYPE_OFFSET 0 73#define INPUT_TYPE_NONTOUCH (0 << INPUT_TYPE_OFFSET) 74#define INPUT_TYPE_SINGLE (1 << INPUT_TYPE_OFFSET) 75#define INPUT_TYPE_DUAL (2 << INPUT_TYPE_OFFSET) 76#define INPUT_TYPE_PALM (3 << INPUT_TYPE_OFFSET) 77#define INPUT_TYPE_PROXIMITY (7 << INPUT_TYPE_OFFSET) 78#define GESTURE_CODE_OFFSET 3 79#define GESTURE_CODE_NO (0 << GESTURE_CODE_OFFSET) 80 81#define MCS5000_TS_X_POS_UPPER 0x11 82#define MCS5000_TS_X_POS_LOWER 0x12 83#define MCS5000_TS_Y_POS_UPPER 0x13 84#define MCS5000_TS_Y_POS_LOWER 0x14 85#define MCS5000_TS_Z_POS 0x15 86#define MCS5000_TS_WIDTH 0x16 87#define MCS5000_TS_GESTURE_VAL 0x17 88#define MCS5000_TS_MODULE_REV 0x20 89#define MCS5000_TS_FIRMWARE_VER 0x21 90 91/* Touchscreen absolute values */ 92#define MCS5000_MAX_XC 0x3ff 93#define MCS5000_MAX_YC 0x3ff 94 95enum mcs5000_ts_read_offset { 96 READ_INPUT_INFO, 97 READ_X_POS_UPPER, 98 READ_X_POS_LOWER, 99 READ_Y_POS_UPPER, 100 READ_Y_POS_LOWER, 101 READ_BLOCK_SIZE, 102}; 103 104/* Each client has this additional data */ 105struct mcs5000_ts_data { 106 struct i2c_client *client; 107 struct input_dev *input_dev; 108 const struct mcs_platform_data *platform_data; 109}; 110 111static irqreturn_t mcs5000_ts_interrupt(int irq, void *dev_id) 112{ 113 struct mcs5000_ts_data *data = dev_id; 114 struct i2c_client *client = data->client; 115 u8 buffer[READ_BLOCK_SIZE]; 116 int err; 117 int x; 118 int y; 119 120 err = i2c_smbus_read_i2c_block_data(client, MCS5000_TS_INPUT_INFO, 121 READ_BLOCK_SIZE, buffer); 122 if (err < 0) { 123 dev_err(&client->dev, "%s, err[%d]\n", __func__, err); 124 goto out; 125 } 126 127 switch (buffer[READ_INPUT_INFO]) { 128 case INPUT_TYPE_NONTOUCH: 129 input_report_key(data->input_dev, BTN_TOUCH, 0); 130 input_sync(data->input_dev); 131 break; 132 133 case INPUT_TYPE_SINGLE: 134 x = (buffer[READ_X_POS_UPPER] << 8) | buffer[READ_X_POS_LOWER]; 135 y = (buffer[READ_Y_POS_UPPER] << 8) | buffer[READ_Y_POS_LOWER]; 136 137 input_report_key(data->input_dev, BTN_TOUCH, 1); 138 input_report_abs(data->input_dev, ABS_X, x); 139 input_report_abs(data->input_dev, ABS_Y, y); 140 input_sync(data->input_dev); 141 break; 142 143 case INPUT_TYPE_DUAL: 144 /* TODO */ 145 break; 146 147 case INPUT_TYPE_PALM: 148 /* TODO */ 149 break; 150 151 case INPUT_TYPE_PROXIMITY: 152 /* TODO */ 153 break; 154 155 default: 156 dev_err(&client->dev, "Unknown ts input type %d\n", 157 buffer[READ_INPUT_INFO]); 158 break; 159 } 160 161 out: 162 return IRQ_HANDLED; 163} 164 165static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data) 166{ 167 const struct mcs_platform_data *platform_data = 168 data->platform_data; 169 struct i2c_client *client = data->client; 170 171 /* Touch reset & sleep mode */ 172 i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, 173 RESET_EXT_SOFT | OP_MODE_SLEEP); 174 175 /* Touch size */ 176 i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_UPPER, 177 platform_data->x_size >> 8); 178 i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_LOWER, 179 platform_data->x_size & 0xff); 180 i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_UPPER, 181 platform_data->y_size >> 8); 182 i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_LOWER, 183 platform_data->y_size & 0xff); 184 185 /* Touch active mode & 80 report rate */ 186 i2c_smbus_write_byte_data(data->client, MCS5000_TS_OP_MODE, 187 OP_MODE_ACTIVE | REPORT_RATE_80); 188} 189 190static int __devinit mcs5000_ts_probe(struct i2c_client *client, 191 const struct i2c_device_id *id) 192{ 193 struct mcs5000_ts_data *data; 194 struct input_dev *input_dev; 195 int ret; 196 197 if (!client->dev.platform_data) 198 return -EINVAL; 199 200 data = kzalloc(sizeof(struct mcs5000_ts_data), GFP_KERNEL); 201 input_dev = input_allocate_device(); 202 if (!data || !input_dev) { 203 dev_err(&client->dev, "Failed to allocate memory\n"); 204 ret = -ENOMEM; 205 goto err_free_mem; 206 } 207 208 data->client = client; 209 data->input_dev = input_dev; 210 data->platform_data = client->dev.platform_data; 211 212 input_dev->name = "MELPAS MCS-5000 Touchscreen"; 213 input_dev->id.bustype = BUS_I2C; 214 input_dev->dev.parent = &client->dev; 215 216 __set_bit(EV_ABS, input_dev->evbit); 217 __set_bit(EV_KEY, input_dev->evbit); 218 __set_bit(BTN_TOUCH, input_dev->keybit); 219 input_set_abs_params(input_dev, ABS_X, 0, MCS5000_MAX_XC, 0, 0); 220 input_set_abs_params(input_dev, ABS_Y, 0, MCS5000_MAX_YC, 0, 0); 221 222 input_set_drvdata(input_dev, data); 223 224 if (data->platform_data->cfg_pin) 225 data->platform_data->cfg_pin(); 226 227 ret = request_threaded_irq(client->irq, NULL, mcs5000_ts_interrupt, 228 IRQF_TRIGGER_LOW | IRQF_ONESHOT, "mcs5000_ts", data); 229 230 if (ret < 0) { 231 dev_err(&client->dev, "Failed to register interrupt\n"); 232 goto err_free_mem; 233 } 234 235 ret = input_register_device(data->input_dev); 236 if (ret < 0) 237 goto err_free_irq; 238 239 mcs5000_ts_phys_init(data); 240 i2c_set_clientdata(client, data); 241 242 return 0; 243 244err_free_irq: 245 free_irq(client->irq, data); 246err_free_mem: 247 input_free_device(input_dev); 248 kfree(data); 249 return ret; 250} 251 252static int __devexit mcs5000_ts_remove(struct i2c_client *client) 253{ 254 struct mcs5000_ts_data *data = i2c_get_clientdata(client); 255 256 free_irq(client->irq, data); 257 input_unregister_device(data->input_dev); 258 kfree(data); 259 260 return 0; 261} 262 263#ifdef CONFIG_PM 264static int mcs5000_ts_suspend(struct i2c_client *client, pm_message_t mesg) 265{ 266 /* Touch sleep mode */ 267 i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP); 268 269 return 0; 270} 271 272static int mcs5000_ts_resume(struct i2c_client *client) 273{ 274 struct mcs5000_ts_data *data = i2c_get_clientdata(client); 275 276 mcs5000_ts_phys_init(data); 277 278 return 0; 279} 280#else 281#define mcs5000_ts_suspend NULL 282#define mcs5000_ts_resume NULL 283#endif 284 285static const struct i2c_device_id mcs5000_ts_id[] = { 286 { "mcs5000_ts", 0 }, 287 { } 288}; 289MODULE_DEVICE_TABLE(i2c, mcs5000_ts_id); 290 291static struct i2c_driver mcs5000_ts_driver = { 292 .probe = mcs5000_ts_probe, 293 .remove = __devexit_p(mcs5000_ts_remove), 294 .suspend = mcs5000_ts_suspend, 295 .resume = mcs5000_ts_resume, 296 .driver = { 297 .name = "mcs5000_ts", 298 }, 299 .id_table = mcs5000_ts_id, 300}; 301 302static int __init mcs5000_ts_init(void) 303{ 304 return i2c_add_driver(&mcs5000_ts_driver); 305} 306 307static void __exit mcs5000_ts_exit(void) 308{ 309 i2c_del_driver(&mcs5000_ts_driver); 310} 311 312module_init(mcs5000_ts_init); 313module_exit(mcs5000_ts_exit); 314 315/* Module information */ 316MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); 317MODULE_DESCRIPTION("Touchscreen driver for MELFAS MCS-5000 controller"); 318MODULE_LICENSE("GPL"); 319