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-rw-r--r--Documentation/input/input-programming.txt17
1 files changed, 9 insertions, 8 deletions
diff --git a/Documentation/input/input-programming.txt b/Documentation/input/input-programming.txt
index d9d523099bb7..47fc86830cd7 100644
--- a/Documentation/input/input-programming.txt
+++ b/Documentation/input/input-programming.txt
@@ -42,8 +42,8 @@ static int __init button_init(void)
42 goto err_free_irq; 42 goto err_free_irq;
43 } 43 }
44 44
45 button_dev->evbit[0] = BIT(EV_KEY); 45 button_dev->evbit[0] = BIT_MASK(EV_KEY);
46 button_dev->keybit[LONG(BTN_0)] = BIT(BTN_0); 46 button_dev->keybit[BIT_WORD(BTN_0)] = BIT_MASK(BTN_0);
47 47
48 error = input_register_device(button_dev); 48 error = input_register_device(button_dev);
49 if (error) { 49 if (error) {
@@ -79,7 +79,7 @@ In the _init function, which is called either upon module load or when
79booting the kernel, it grabs the required resources (it should also check 79booting the kernel, it grabs the required resources (it should also check
80for the presence of the device). 80for the presence of the device).
81 81
82Then it allocates a new input device structure with input_aloocate_device() 82Then it allocates a new input device structure with input_allocate_device()
83and sets up input bitfields. This way the device driver tells the other 83and sets up input bitfields. This way the device driver tells the other
84parts of the input systems what it is - what events can be generated or 84parts of the input systems what it is - what events can be generated or
85accepted by this input device. Our example device can only generate EV_KEY 85accepted by this input device. Our example device can only generate EV_KEY
@@ -217,14 +217,15 @@ If you don't need absfuzz and absflat, you can set them to zero, which mean
217that the thing is precise and always returns to exactly the center position 217that the thing is precise and always returns to exactly the center position
218(if it has any). 218(if it has any).
219 219
2201.4 NBITS(), LONG(), BIT() 2201.4 BITS_TO_LONGS(), BIT_WORD(), BIT_MASK()
221~~~~~~~~~~~~~~~~~~~~~~~~~~ 221~~~~~~~~~~~~~~~~~~~~~~~~~~
222 222
223These three macros from input.h help some bitfield computations: 223These three macros from bitops.h help some bitfield computations:
224 224
225 NBITS(x) - returns the length of a bitfield array in longs for x bits 225 BITS_TO_LONGS(x) - returns the length of a bitfield array in longs for
226 LONG(x) - returns the index in the array in longs for bit x 226 x bits
227 BIT(x) - returns the index in a long for bit x 227 BIT_WORD(x) - returns the index in the array in longs for bit x
228 BIT_MASK(x) - returns the index in a long for bit x
228 229
2291.5 The id* and name fields 2301.5 The id* and name fields
230~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 231~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~