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/i2c.h> 18 #include <linux/i2c/mcs.h> 19 #include <linux/interrupt.h> 20 #include <linux/input.h> 21 #include <linux/irq.h> 22 #include <linux/slab.h> 23 24 /* Registers */ 25 #define MCS5000_TS_STATUS 0x00 26 #define STATUS_OFFSET 0 27 #define STATUS_NO (0 << STATUS_OFFSET) 28 #define STATUS_INIT (1 << STATUS_OFFSET) 29 #define STATUS_SENSING (2 << STATUS_OFFSET) 30 #define STATUS_COORD (3 << STATUS_OFFSET) 31 #define STATUS_GESTURE (4 << STATUS_OFFSET) 32 #define ERROR_OFFSET 4 33 #define ERROR_NO (0 << ERROR_OFFSET) 34 #define ERROR_POWER_ON_RESET (1 << ERROR_OFFSET) 35 #define ERROR_INT_RESET (2 << ERROR_OFFSET) 36 #define ERROR_EXT_RESET (3 << ERROR_OFFSET) 37 #define ERROR_INVALID_REG_ADDRESS (8 << ERROR_OFFSET) 38 #define ERROR_INVALID_REG_VALUE (9 << ERROR_OFFSET) 39 40 #define MCS5000_TS_OP_MODE 0x01 41 #define RESET_OFFSET 0 42 #define RESET_NO (0 << RESET_OFFSET) 43 #define RESET_EXT_SOFT (1 << RESET_OFFSET) 44 #define OP_MODE_OFFSET 1 45 #define OP_MODE_SLEEP (0 << OP_MODE_OFFSET) 46 #define OP_MODE_ACTIVE (1 << OP_MODE_OFFSET) 47 #define GESTURE_OFFSET 4 48 #define GESTURE_DISABLE (0 << GESTURE_OFFSET) 49 #define GESTURE_ENABLE (1 << GESTURE_OFFSET) 50 #define PROXIMITY_OFFSET 5 51 #define PROXIMITY_DISABLE (0 << PROXIMITY_OFFSET) 52 #define PROXIMITY_ENABLE (1 << PROXIMITY_OFFSET) 53 #define SCAN_MODE_OFFSET 6 54 #define SCAN_MODE_INTERRUPT (0 << SCAN_MODE_OFFSET) 55 #define SCAN_MODE_POLLING (1 << SCAN_MODE_OFFSET) 56 #define REPORT_RATE_OFFSET 7 57 #define REPORT_RATE_40 (0 << REPORT_RATE_OFFSET) 58 #define REPORT_RATE_80 (1 << REPORT_RATE_OFFSET) 59 60 #define MCS5000_TS_SENS_CTL 0x02 61 #define MCS5000_TS_FILTER_CTL 0x03 62 #define PRI_FILTER_OFFSET 0 63 #define SEC_FILTER_OFFSET 4 64 65 #define MCS5000_TS_X_SIZE_UPPER 0x08 66 #define MCS5000_TS_X_SIZE_LOWER 0x09 67 #define MCS5000_TS_Y_SIZE_UPPER 0x0A 68 #define MCS5000_TS_Y_SIZE_LOWER 0x0B 69 70 #define MCS5000_TS_INPUT_INFO 0x10 71 #define INPUT_TYPE_OFFSET 0 72 #define INPUT_TYPE_NONTOUCH (0 << INPUT_TYPE_OFFSET) 73 #define INPUT_TYPE_SINGLE (1 << INPUT_TYPE_OFFSET) 74 #define INPUT_TYPE_DUAL (2 << INPUT_TYPE_OFFSET) 75 #define INPUT_TYPE_PALM (3 << INPUT_TYPE_OFFSET) 76 #define INPUT_TYPE_PROXIMITY (7 << INPUT_TYPE_OFFSET) 77 #define GESTURE_CODE_OFFSET 3 78 #define GESTURE_CODE_NO (0 << GESTURE_CODE_OFFSET) 79 80 #define MCS5000_TS_X_POS_UPPER 0x11 81 #define MCS5000_TS_X_POS_LOWER 0x12 82 #define MCS5000_TS_Y_POS_UPPER 0x13 83 #define MCS5000_TS_Y_POS_LOWER 0x14 84 #define MCS5000_TS_Z_POS 0x15 85 #define MCS5000_TS_WIDTH 0x16 86 #define MCS5000_TS_GESTURE_VAL 0x17 87 #define MCS5000_TS_MODULE_REV 0x20 88 #define MCS5000_TS_FIRMWARE_VER 0x21 89 90 /* Touchscreen absolute values */ 91 #define MCS5000_MAX_XC 0x3ff 92 #define MCS5000_MAX_YC 0x3ff 93 94 enum mcs5000_ts_read_offset { 95 READ_INPUT_INFO, 96 READ_X_POS_UPPER, 97 READ_X_POS_LOWER, 98 READ_Y_POS_UPPER, 99 READ_Y_POS_LOWER, 100 READ_BLOCK_SIZE, 101 }; 102 103 /* Each client has this additional data */ 104 struct mcs5000_ts_data { 105 struct i2c_client *client; 106 struct input_dev *input_dev; 107 const struct mcs_platform_data *platform_data; 108 }; 109 110 static irqreturn_t mcs5000_ts_interrupt(int irq, void *dev_id) 111 { 112 struct mcs5000_ts_data *data = dev_id; 113 struct i2c_client *client = data->client; 114 u8 buffer[READ_BLOCK_SIZE]; 115 int err; 116 int x; 117 int y; 118 119 err = i2c_smbus_read_i2c_block_data(client, MCS5000_TS_INPUT_INFO, 120 READ_BLOCK_SIZE, buffer); 121 if (err < 0) { 122 dev_err(&client->dev, "%s, err[%d]\n", __func__, err); 123 goto out; 124 } 125 126 switch (buffer[READ_INPUT_INFO]) { 127 case INPUT_TYPE_NONTOUCH: 128 input_report_key(data->input_dev, BTN_TOUCH, 0); 129 input_sync(data->input_dev); 130 break; 131 132 case INPUT_TYPE_SINGLE: 133 x = (buffer[READ_X_POS_UPPER] << 8) | buffer[READ_X_POS_LOWER]; 134 y = (buffer[READ_Y_POS_UPPER] << 8) | buffer[READ_Y_POS_LOWER]; 135 136 input_report_key(data->input_dev, BTN_TOUCH, 1); 137 input_report_abs(data->input_dev, ABS_X, x); 138 input_report_abs(data->input_dev, ABS_Y, y); 139 input_sync(data->input_dev); 140 break; 141 142 case INPUT_TYPE_DUAL: 143 /* TODO */ 144 break; 145 146 case INPUT_TYPE_PALM: 147 /* TODO */ 148 break; 149 150 case INPUT_TYPE_PROXIMITY: 151 /* TODO */ 152 break; 153 154 default: 155 dev_err(&client->dev, "Unknown ts input type %d\n", 156 buffer[READ_INPUT_INFO]); 157 break; 158 } 159 160 out: 161 return IRQ_HANDLED; 162 } 163 164 static void mcs5000_ts_phys_init(struct mcs5000_ts_data *data, 165 const struct mcs_platform_data *platform_data) 166 { 167 struct i2c_client *client = data->client; 168 169 /* Touch reset & sleep mode */ 170 i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, 171 RESET_EXT_SOFT | OP_MODE_SLEEP); 172 173 /* Touch size */ 174 i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_UPPER, 175 platform_data->x_size >> 8); 176 i2c_smbus_write_byte_data(client, MCS5000_TS_X_SIZE_LOWER, 177 platform_data->x_size & 0xff); 178 i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_UPPER, 179 platform_data->y_size >> 8); 180 i2c_smbus_write_byte_data(client, MCS5000_TS_Y_SIZE_LOWER, 181 platform_data->y_size & 0xff); 182 183 /* Touch active mode & 80 report rate */ 184 i2c_smbus_write_byte_data(data->client, MCS5000_TS_OP_MODE, 185 OP_MODE_ACTIVE | REPORT_RATE_80); 186 } 187 188 static int mcs5000_ts_probe(struct i2c_client *client, 189 const struct i2c_device_id *id) 190 { 191 const struct mcs_platform_data *pdata; 192 struct mcs5000_ts_data *data; 193 struct input_dev *input_dev; 194 int error; 195 196 pdata = dev_get_platdata(&client->dev); 197 if (!pdata) 198 return -EINVAL; 199 200 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 201 if (!data) { 202 dev_err(&client->dev, "Failed to allocate memory\n"); 203 return -ENOMEM; 204 } 205 206 data->client = client; 207 208 input_dev = devm_input_allocate_device(&client->dev); 209 if (!input_dev) { 210 dev_err(&client->dev, "Failed to allocate input device\n"); 211 return -ENOMEM; 212 } 213 214 input_dev->name = "MELFAS MCS-5000 Touchscreen"; 215 input_dev->id.bustype = BUS_I2C; 216 input_dev->dev.parent = &client->dev; 217 218 __set_bit(EV_ABS, input_dev->evbit); 219 __set_bit(EV_KEY, input_dev->evbit); 220 __set_bit(BTN_TOUCH, input_dev->keybit); 221 input_set_abs_params(input_dev, ABS_X, 0, MCS5000_MAX_XC, 0, 0); 222 input_set_abs_params(input_dev, ABS_Y, 0, MCS5000_MAX_YC, 0, 0); 223 224 input_set_drvdata(input_dev, data); 225 data->input_dev = input_dev; 226 227 if (pdata->cfg_pin) 228 pdata->cfg_pin(); 229 230 error = devm_request_threaded_irq(&client->dev, client->irq, 231 NULL, mcs5000_ts_interrupt, 232 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 233 "mcs5000_ts", data); 234 if (error) { 235 dev_err(&client->dev, "Failed to register interrupt\n"); 236 return error; 237 } 238 239 error = input_register_device(data->input_dev); 240 if (error) { 241 dev_err(&client->dev, "Failed to register input device\n"); 242 return error; 243 } 244 245 mcs5000_ts_phys_init(data, pdata); 246 i2c_set_clientdata(client, data); 247 248 return 0; 249 } 250 251 static int __maybe_unused mcs5000_ts_suspend(struct device *dev) 252 { 253 struct i2c_client *client = to_i2c_client(dev); 254 255 /* Touch sleep mode */ 256 i2c_smbus_write_byte_data(client, MCS5000_TS_OP_MODE, OP_MODE_SLEEP); 257 258 return 0; 259 } 260 261 static int __maybe_unused mcs5000_ts_resume(struct device *dev) 262 { 263 struct i2c_client *client = to_i2c_client(dev); 264 struct mcs5000_ts_data *data = i2c_get_clientdata(client); 265 const struct mcs_platform_data *pdata = dev_get_platdata(dev); 266 267 mcs5000_ts_phys_init(data, pdata); 268 269 return 0; 270 } 271 272 static SIMPLE_DEV_PM_OPS(mcs5000_ts_pm, mcs5000_ts_suspend, mcs5000_ts_resume); 273 274 static const struct i2c_device_id mcs5000_ts_id[] = { 275 { "mcs5000_ts", 0 }, 276 { } 277 }; 278 MODULE_DEVICE_TABLE(i2c, mcs5000_ts_id); 279 280 static struct i2c_driver mcs5000_ts_driver = { 281 .probe = mcs5000_ts_probe, 282 .driver = { 283 .name = "mcs5000_ts", 284 .pm = &mcs5000_ts_pm, 285 }, 286 .id_table = mcs5000_ts_id, 287 }; 288 289 module_i2c_driver(mcs5000_ts_driver); 290 291 /* Module information */ 292 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); 293 MODULE_DESCRIPTION("Touchscreen driver for MELFAS MCS-5000 controller"); 294 MODULE_LICENSE("GPL"); 295