target/linux/xburst/patches-2.6.35/801-n526-lpc.patch

   1 From f5978b5a9701fe1ddeffa0c5f73923fcaf31129e Mon Sep 17 00:00:00 2001
   2 From: Lars-Peter Clausen <lars@metafoo.de>
   3 Date: Wed, 12 May 2010 14:23:43 +0200
   4 Subject: [PATCH] Add n526 lpc driver
   5
   6 ---
   7  drivers/misc/Kconfig    |    9 ++
   8  drivers/misc/Makefile   |    1 +
   9  drivers/misc/n526-lpc.c |  237 +++++++++++++++++++++++++++++++++++++++++++++++
  10  3 files changed, 247 insertions(+), 0 deletions(-)
  11  create mode 100644 drivers/misc/n526-lpc.c
  12
  13 --- a/drivers/misc/Kconfig
  14 +++ b/drivers/misc/Kconfig
  15 @@ -361,6 +361,15 @@ config N516_LPC
  16         help
  17           N516 keyboard & power controller driver
  18
  19 +config N526_LPC
  20 +       tristate "N526 LPC934 coprocessor"
  21 +       depends on JZ4740_N526
  22 +       help
  23 +         If you say yes here you get support for the N526s NXP LPC934 coprocessor.
  24 +         It is used as a keyboard controllor and for power management.
  25 +
  26 +         If you have a N526 you probably want to say Y here.
  27 +
  28  source "drivers/misc/c2port/Kconfig"
  29  source "drivers/misc/eeprom/Kconfig"
  30  source "drivers/misc/cb710/Kconfig"
  31 --- a/drivers/misc/Makefile
  32 +++ b/drivers/misc/Makefile
  33 @@ -32,3 +32,4 @@ obj-y                         += eeprom/
  34  obj-y                          += cb710/
  35  obj-$(CONFIG_VMWARE_BALLOON)   += vmware_balloon.o
  36  obj-$(CONFIG_N516_LPC)         += n516-lpc.o
  37 +obj-$(CONFIG_N526_LPC)         += n526-lpc.o
  38 --- /dev/null
  39 +++ b/drivers/misc/n526-lpc.c
  40 @@ -0,0 +1,237 @@
  41 +/*
  42 + * Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de>
  43 + *
  44 + * This program is free software; you can redistribute it and/or modify
  45 + * it under the terms of the GNU General Public License version 2 as
  46 + * published by the Free Software Foundation.
  47 + *
  48 + *  You should have received a copy of the  GNU General Public License along
  49 + *  with this program; if not, write  to the Free Software Foundation, Inc.,
  50 + *  675 Mass Ave, Cambridge, MA 02139, USA.
  51 + *
  52 + */
  53 +
  54 +#include <linux/kernel.h>
  55 +#include <linux/module.h>
  56 +#include <linux/i2c.h>
  57 +#include <linux/input.h>
  58 +#include <linux/irq.h>
  59 +#include <linux/interrupt.h>
  60 +
  61 +#include <linux/workqueue.h>
  62 +
  63 +#include <asm/mach-jz4740/irq.h>
  64 +#include <asm/mach-jz4740/gpio.h>
  65 +
  66 +struct n526_lpc {
  67 +       struct i2c_client *client;
  68 +       struct input_dev *input;
  69 +
  70 +       struct work_struct work;
  71 +};
  72 +
  73 +static const unsigned int n526_lpc_keymap[] = {
  74 +       [0x01] = KEY_PAGEUP,
  75 +       [0x02] = KEY_PAGEDOWN,
  76 +       [0x03] = KEY_VOLUMEUP,
  77 +       [0x04] = KEY_VOLUMEDOWN,
  78 +       [0x06] = KEY_1,
  79 +       [0x07] = KEY_Q,
  80 +       [0x08] = KEY_A,
  81 +       [0x09] = KEY_Z,
  82 +       [0x0a] = KEY_LEFTSHIFT,
  83 +       [0x0b] = KEY_2,
  84 +       [0x0c] = KEY_W,
  85 +       [0x0d] = KEY_S,
  86 +       [0x0e] = KEY_X,
  87 +       [0x0f] = KEY_REFRESH,
  88 +       [0x10] = KEY_3,
  89 +       [0x11] = KEY_E,
  90 +       [0x12] = KEY_D,
  91 +       [0x13] = KEY_C,
  92 +       [0x14] = KEY_DOCUMENTS,
  93 +       [0x15] = KEY_4,
  94 +       [0x16] = KEY_R,
  95 +       [0x17] = KEY_F,
  96 +       [0x18] = KEY_V,
  97 +       [0x19] = KEY_MUTE,
  98 +       [0x1a] = KEY_5,
  99 +       [0x1b] = KEY_T,
 100 +       [0x1c] = KEY_G,
 101 +       [0x1d] = KEY_B,
 102 +       [0x1e] = KEY_DELETE,
 103 +       [0x1f] = KEY_6,
 104 +       [0x20] = KEY_Y,
 105 +       [0x21] = KEY_H,
 106 +       [0x22] = KEY_N,
 107 +       [0x23] = KEY_SPACE,
 108 +       [0x24] = KEY_7,
 109 +       [0x25] = KEY_U,
 110 +       [0x26] = KEY_J,
 111 +       [0x27] = KEY_M,
 112 +/*     [0x28] = KEY_SYM, */
 113 +       [0x29] = KEY_8,
 114 +       [0x2a] = KEY_I,
 115 +       [0x2b] = KEY_K,
 116 +       [0x2c] = KEY_MENU,
 117 +       [0x2d] = KEY_LEFT,
 118 +       [0x2e] = KEY_9,
 119 +       [0x2f] = KEY_O,
 120 +       [0x30] = KEY_L,
 121 +       [0x31] = KEY_UP,
 122 +       [0x32] = KEY_DOWN,
 123 +       [0x33] = KEY_0,
 124 +       [0x34] = KEY_P,
 125 +       [0x35] = KEY_BACKSPACE,
 126 +       [0x36] = KEY_ENTER,
 127 +       [0x37] = KEY_RIGHT,
 128 +};
 129 +
 130 +static void n526_lpc_irq_work(struct work_struct *work)
 131 +{
 132 +       int ret;
 133 +       struct n526_lpc *n526_lpc = container_of(work, struct n526_lpc, work);
 134 +       struct i2c_client *client = n526_lpc->client;
 135 +       unsigned char raw_msg;
 136 +       struct i2c_msg msg = {client->addr, client->flags | I2C_M_RD, 1, &raw_msg};
 137 +       unsigned char keycode;
 138 +
 139 +
 140 +       ret = i2c_transfer(client->adapter, &msg, 1);
 141 +
 142 +       if (ret != 1) {
 143 +               dev_err(&client->dev, "Failed to read lpc status\n");
 144 +       }
 145 +
 146 +       keycode = raw_msg & 0x7f;
 147 +
 148 +       if (keycode < ARRAY_SIZE(n526_lpc_keymap)) {
 149 +               input_report_key(n526_lpc->input, n526_lpc_keymap[keycode],
 150 +                                !(raw_msg & 0x80));
 151 +               input_sync(n526_lpc->input);
 152 +       }
 153 +}
 154 +
 155 +static irqreturn_t n526_lpc_irq(int irq, void *dev_id)
 156 +{
 157 +       struct n526_lpc *n526_lpc = dev_id;
 158 +
 159 +       schedule_work(&n526_lpc->work);
 160 +       return IRQ_HANDLED;
 161 +}
 162 +
 163 +static int __devinit n526_lpc_probe(struct i2c_client *client,
 164 +               const struct i2c_device_id *id)
 165 +{
 166 +       int ret;
 167 +       size_t i;
 168 +       struct n526_lpc *n526_lpc;
 169 +       struct input_dev *input;
 170 +
 171 +       n526_lpc = kmalloc(sizeof(*n526_lpc), GFP_KERNEL);
 172 +
 173 +       if (!n526_lpc) {
 174 +               dev_err(&client->dev, "Failed to allocate device structure\n");
 175 +               return -ENOMEM;
 176 +       }
 177 +
 178 +       input = input_allocate_device();
 179 +       if (!input) {
 180 +               dev_err(&client->dev, "Failed to allocate input device\n");
 181 +               ret = -ENOMEM;
 182 +               goto err_free;
 183 +       }
 184 +
 185 +       input->name = "n526-keys";
 186 +       input->phys = "n526-keys/input0";
 187 +       input->dev.parent = &client->dev;
 188 +       input->id.bustype = BUS_I2C;
 189 +       input->id.vendor  = 0x0001;
 190 +       input->id.product = 0x0001;
 191 +       input->id.version = 0x0001;
 192 +
 193 +       __set_bit(EV_KEY, input->evbit);
 194 +
 195 +       for (i = 0; i < ARRAY_SIZE(n526_lpc_keymap); ++i) {
 196 +               if (n526_lpc_keymap[i] != 0)
 197 +                       __set_bit(n526_lpc_keymap[i], input->keybit);
 198 +       }
 199 +
 200 +       ret = input_register_device(input);
 201 +
 202 +       if (ret) {
 203 +               dev_err(&client->dev, "Failed to register input device: %d\n", ret);
 204 +               goto err_free_input;
 205 +       }
 206 +
 207 +       n526_lpc->client = client;
 208 +       n526_lpc->input  = input;
 209 +       INIT_WORK(&n526_lpc->work, n526_lpc_irq_work);
 210 +
 211 +       ret = request_irq(client->irq, n526_lpc_irq, IRQF_TRIGGER_FALLING,
 212 +                         "n526-lpc", n526_lpc);
 213 +       if (ret) {
 214 +               dev_err(&client->dev, "Failed to request irq: %d\n", ret);
 215 +               goto err_unregister_input;
 216 +       }
 217 +
 218 +       i2c_set_clientdata(client, n526_lpc);
 219 +
 220 +       return 0;
 221 +
 222 +err_unregister_input:
 223 +       input_unregister_device(input);
 224 +err_free_input:
 225 +       input_free_device(input);
 226 +err_free:
 227 +       kfree(n526_lpc);
 228 +
 229 +       return ret;
 230 +}
 231 +
 232 +static int n526_lpc_remove(struct i2c_client *client)
 233 +{
 234 +       struct n526_lpc *n526_lpc = i2c_get_clientdata(client);
 235 +
 236 +       free_irq(client->irq, n526_lpc);
 237 +
 238 +       i2c_set_clientdata(client, NULL);
 239 +       input_unregister_device(n526_lpc->input);
 240 +       input_free_device(n526_lpc->input);
 241 +       kfree(n526_lpc);
 242 +
 243 + return 0;
 244 +}
 245 +
 246 +static const struct i2c_device_id n526_lpc_id[] = {
 247 +       { "n526-lpc", 0 },
 248 +       { }
 249 +};
 250 +MODULE_DEVICE_TABLE(i2c, n526_lpc_id);
 251 +
 252 +static struct i2c_driver n526_lpc_driver = {
 253 +       .driver = {
 254 +               .name = "n526-lpc",
 255 +               .owner = THIS_MODULE,
 256 +       },
 257 +       .probe = n526_lpc_probe,
 258 +       .remove = n526_lpc_remove,
 259 +       .id_table = n526_lpc_id,
 260 +};
 261 +
 262 +static int __init n526_lpc_init(void)
 263 +{
 264 +       return i2c_add_driver(&n526_lpc_driver);
 265 +}
 266 +module_init(n526_lpc_init);
 267 +
 268 +static void __exit n526_lpc_exit(void)
 269 +{
 270 +       i2c_del_driver(&n526_lpc_driver);
 271 +}
 272 +module_exit(n526_lpc_exit);
 273 +
 274 +MODULE_LICENSE("GPL");
 275 +MODULE_AUTHOR("Lars-Peter Clausen");
 276 +MODULE_DESCRIPTION("n526 keypad driver");
 277 +MODULE_ALIAS("i2c:n526-keys");