drivers/input/rmi4/rmi_f03.c

   1 /*
   2  * Copyright (C) 2015-2016 Red Hat
   3  * Copyright (C) 2015 Lyude Paul <thatslyude@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/slab.h>
  12 #include <linux/serio.h>
  13 #include <linux/notifier.h>
  14 #include "rmi_driver.h"
  15
  16 #define RMI_F03_RX_DATA_OFB             0x01
  17 #define RMI_F03_OB_SIZE                 2
  18
  19 #define RMI_F03_OB_OFFSET               2
  20 #define RMI_F03_OB_DATA_OFFSET          1
  21 #define RMI_F03_OB_FLAG_TIMEOUT         BIT(6)
  22 #define RMI_F03_OB_FLAG_PARITY          BIT(7)
  23
  24 #define RMI_F03_DEVICE_COUNT            0x07
  25 #define RMI_F03_BYTES_PER_DEVICE        0x07
  26 #define RMI_F03_BYTES_PER_DEVICE_SHIFT  4
  27 #define RMI_F03_QUEUE_LENGTH            0x0F
  28
  29 #define PSMOUSE_OOB_EXTRA_BTNS          0x01
  30
  31 struct f03_data {
  32         struct rmi_function *fn;
  33
  34         struct serio *serio;
  35         bool serio_registered;
  36
  37         unsigned int overwrite_buttons;
  38
  39         u8 device_count;
  40         u8 rx_queue_length;
  41 };
  42
  43 int rmi_f03_overwrite_button(struct rmi_function *fn, unsigned int button,
  44                              int value)
  45 {
  46         struct f03_data *f03 = dev_get_drvdata(&fn->dev);
  47         unsigned int bit;
  48
  49         if (button < BTN_LEFT || button > BTN_MIDDLE)
  50                 return -EINVAL;
  51
  52         bit = BIT(button - BTN_LEFT);
  53
  54         if (value)
  55                 f03->overwrite_buttons |= bit;
  56         else
  57                 f03->overwrite_buttons &= ~bit;
  58
  59         return 0;
  60 }
  61
  62 void rmi_f03_commit_buttons(struct rmi_function *fn)
  63 {
  64         struct f03_data *f03 = dev_get_drvdata(&fn->dev);
  65         struct serio *serio = f03->serio;
  66
  67         serio_pause_rx(serio);
  68         if (serio->drv) {
  69                 serio->drv->interrupt(serio, PSMOUSE_OOB_EXTRA_BTNS,
  70                                       SERIO_OOB_DATA);
  71                 serio->drv->interrupt(serio, f03->overwrite_buttons,
  72                                       SERIO_OOB_DATA);
  73         }
  74         serio_continue_rx(serio);
  75 }
  76
  77 static int rmi_f03_pt_write(struct serio *id, unsigned char val)
  78 {
  79         struct f03_data *f03 = id->port_data;
  80         int error;
  81
  82         rmi_dbg(RMI_DEBUG_FN, &f03->fn->dev,
  83                 "%s: Wrote %.2hhx to PS/2 passthrough address",
  84                 __func__, val);
  85
  86         error = rmi_write(f03->fn->rmi_dev, f03->fn->fd.data_base_addr, val);
  87         if (error) {
  88                 dev_err(&f03->fn->dev,
  89                         "%s: Failed to write to F03 TX register (%d).\n",
  90                         __func__, error);
  91                 return error;
  92         }
  93
  94         return 0;
  95 }
  96
  97 static int rmi_f03_initialize(struct f03_data *f03)
  98 {
  99         struct rmi_function *fn = f03->fn;
 100         struct device *dev = &fn->dev;
 101         int error;
 102         u8 bytes_per_device;
 103         u8 query1;
 104         u8 query2[RMI_F03_DEVICE_COUNT * RMI_F03_BYTES_PER_DEVICE];
 105         size_t query2_len;
 106
 107         error = rmi_read(fn->rmi_dev, fn->fd.query_base_addr, &query1);
 108         if (error) {
 109                 dev_err(dev, "Failed to read query register (%d).\n", error);
 110                 return error;
 111         }
 112
 113         f03->device_count = query1 & RMI_F03_DEVICE_COUNT;
 114         bytes_per_device = (query1 >> RMI_F03_BYTES_PER_DEVICE_SHIFT) &
 115                                 RMI_F03_BYTES_PER_DEVICE;
 116
 117         query2_len = f03->device_count * bytes_per_device;
 118
 119         /*
 120          * The first generation of image sensors don't have a second part to
 121          * their f03 query, as such we have to set some of these values manually
 122          */
 123         if (query2_len < 1) {
 124                 f03->device_count = 1;
 125                 f03->rx_queue_length = 7;
 126         } else {
 127                 error = rmi_read_block(fn->rmi_dev, fn->fd.query_base_addr + 1,
 128                                        query2, query2_len);
 129                 if (error) {
 130                         dev_err(dev,
 131                                 "Failed to read second set of query registers (%d).\n",
 132                                 error);
 133                         return error;
 134                 }
 135
 136                 f03->rx_queue_length = query2[0] & RMI_F03_QUEUE_LENGTH;
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int rmi_f03_pt_open(struct serio *serio)
 143 {
 144         struct f03_data *f03 = serio->port_data;
 145         struct rmi_function *fn = f03->fn;
 146         const u8 ob_len = f03->rx_queue_length * RMI_F03_OB_SIZE;
 147         const u16 data_addr = fn->fd.data_base_addr + RMI_F03_OB_OFFSET;
 148         u8 obs[RMI_F03_QUEUE_LENGTH * RMI_F03_OB_SIZE];
 149         int error;
 150
 151         /*
 152          * Consume any pending data. Some devices like to spam with
 153          * 0xaa 0x00 announcements which may confuse us as we try to
 154          * probe the device.
 155          */
 156         error = rmi_read_block(fn->rmi_dev, data_addr, &obs, ob_len);
 157         if (!error)
 158                 rmi_dbg(RMI_DEBUG_FN, &fn->dev,
 159                         "%s: Consumed %*ph (%d) from PS2 guest\n",
 160                         __func__, ob_len, obs, ob_len);
 161
 162         return fn->rmi_dev->driver->set_irq_bits(fn->rmi_dev, fn->irq_mask);
 163 }
 164
 165 static void rmi_f03_pt_close(struct serio *serio)
 166 {
 167         struct f03_data *f03 = serio->port_data;
 168         struct rmi_function *fn = f03->fn;
 169
 170         fn->rmi_dev->driver->clear_irq_bits(fn->rmi_dev, fn->irq_mask);
 171 }
 172
 173 static int rmi_f03_register_pt(struct f03_data *f03)
 174 {
 175         struct serio *serio;
 176
 177         serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 178         if (!serio)
 179                 return -ENOMEM;
 180
 181         serio->id.type = SERIO_PS_PSTHRU;
 182         serio->write = rmi_f03_pt_write;
 183         serio->open = rmi_f03_pt_open;
 184         serio->close = rmi_f03_pt_close;
 185         serio->port_data = f03;
 186
 187         strlcpy(serio->name, "RMI4 PS/2 pass-through", sizeof(serio->name));
 188         snprintf(serio->phys, sizeof(serio->phys), "%s/serio0",
 189                  dev_name(&f03->fn->dev));
 190         serio->dev.parent = &f03->fn->dev;
 191
 192         f03->serio = serio;
 193
 194         printk(KERN_INFO "serio: %s port at %s\n",
 195                 serio->name, dev_name(&f03->fn->dev));
 196         serio_register_port(serio);
 197
 198         return 0;
 199 }
 200
 201 static int rmi_f03_probe(struct rmi_function *fn)
 202 {
 203         struct device *dev = &fn->dev;
 204         struct f03_data *f03;
 205         int error;
 206
 207         f03 = devm_kzalloc(dev, sizeof(struct f03_data), GFP_KERNEL);
 208         if (!f03)
 209                 return -ENOMEM;
 210
 211         f03->fn = fn;
 212
 213         error = rmi_f03_initialize(f03);
 214         if (error < 0)
 215                 return error;
 216
 217         if (f03->device_count != 1)
 218                 dev_warn(dev, "found %d devices on PS/2 passthrough",
 219                          f03->device_count);
 220
 221         dev_set_drvdata(dev, f03);
 222         return 0;
 223 }
 224
 225 static int rmi_f03_config(struct rmi_function *fn)
 226 {
 227         struct f03_data *f03 = dev_get_drvdata(&fn->dev);
 228         int error;
 229
 230         if (!f03->serio_registered) {
 231                 error = rmi_f03_register_pt(f03);
 232                 if (error)
 233                         return error;
 234
 235                 f03->serio_registered = true;
 236         } else {
 237                 /*
 238                  * We must be re-configuring the sensor, just enable
 239                  * interrupts for this function.
 240                  */
 241                 fn->rmi_dev->driver->set_irq_bits(fn->rmi_dev, fn->irq_mask);
 242         }
 243
 244         return 0;
 245 }
 246
 247 static irqreturn_t rmi_f03_attention(int irq, void *ctx)
 248 {
 249         struct rmi_function *fn = ctx;
 250         struct rmi_device *rmi_dev = fn->rmi_dev;
 251         struct rmi_driver_data *drvdata = dev_get_drvdata(&rmi_dev->dev);
 252         struct f03_data *f03 = dev_get_drvdata(&fn->dev);
 253         const u16 data_addr = fn->fd.data_base_addr + RMI_F03_OB_OFFSET;
 254         const u8 ob_len = f03->rx_queue_length * RMI_F03_OB_SIZE;
 255         u8 obs[RMI_F03_QUEUE_LENGTH * RMI_F03_OB_SIZE];
 256         u8 ob_status;
 257         u8 ob_data;
 258         unsigned int serio_flags;
 259         int i;
 260         int error;
 261
 262         if (drvdata->attn_data.data) {
 263                 /* First grab the data passed by the transport device */
 264                 if (drvdata->attn_data.size < ob_len) {
 265                         dev_warn(&fn->dev, "F03 interrupted, but data is missing!\n");
 266                         return IRQ_HANDLED;
 267                 }
 268
 269                 memcpy(obs, drvdata->attn_data.data, ob_len);
 270
 271                 drvdata->attn_data.data += ob_len;
 272                 drvdata->attn_data.size -= ob_len;
 273         } else {
 274                 /* Grab all of the data registers, and check them for data */
 275                 error = rmi_read_block(fn->rmi_dev, data_addr, &obs, ob_len);
 276                 if (error) {
 277                         dev_err(&fn->dev,
 278                                 "%s: Failed to read F03 output buffers: %d\n",
 279                                 __func__, error);
 280                         serio_interrupt(f03->serio, 0, SERIO_TIMEOUT);
 281                         return IRQ_RETVAL(error);
 282                 }
 283         }
 284
 285         for (i = 0; i < ob_len; i += RMI_F03_OB_SIZE) {
 286                 ob_status = obs[i];
 287                 ob_data = obs[i + RMI_F03_OB_DATA_OFFSET];
 288                 serio_flags = 0;
 289
 290                 if (!(ob_status & RMI_F03_RX_DATA_OFB))
 291                         continue;
 292
 293                 if (ob_status & RMI_F03_OB_FLAG_TIMEOUT)
 294                         serio_flags |= SERIO_TIMEOUT;
 295                 if (ob_status & RMI_F03_OB_FLAG_PARITY)
 296                         serio_flags |= SERIO_PARITY;
 297
 298                 rmi_dbg(RMI_DEBUG_FN, &fn->dev,
 299                         "%s: Received %.2hhx from PS2 guest T: %c P: %c\n",
 300                         __func__, ob_data,
 301                         serio_flags & SERIO_TIMEOUT ?  'Y' : 'N',
 302                         serio_flags & SERIO_PARITY ? 'Y' : 'N');
 303
 304                 serio_interrupt(f03->serio, ob_data, serio_flags);
 305         }
 306
 307         return IRQ_HANDLED;
 308 }
 309
 310 static void rmi_f03_remove(struct rmi_function *fn)
 311 {
 312         struct f03_data *f03 = dev_get_drvdata(&fn->dev);
 313
 314         if (f03->serio_registered)
 315                 serio_unregister_port(f03->serio);
 316 }
 317
 318 struct rmi_function_handler rmi_f03_handler = {
 319         .driver = {
 320                 .name = "rmi4_f03",
 321         },
 322         .func = 0x03,
 323         .probe = rmi_f03_probe,
 324         .config = rmi_f03_config,
 325         .attention = rmi_f03_attention,
 326         .remove = rmi_f03_remove,
 327 };
 328
 329 MODULE_AUTHOR("Lyude Paul <thatslyude@gmail.com>");
 330 MODULE_DESCRIPTION("RMI F03 module");
 331 MODULE_LICENSE("GPL");