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authorPhilipp Zabel <philipp.zabel@gmail.com>2008-04-09 14:20:34 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-04-19 06:29:07 -0400
commita1635b8fe59de2c5223cda5ca8397b875c901904 (patch)
tree047db24bdba7da410937e1f8da821d30e9052a9f /include/linux/mfd/htc-egpio.h
parente6816f34e4ee237fc1b54e0357e9ea31462ad411 (diff)
[ARM] 4947/1: htc-egpio, a driver for GPIO/IRQ expanders with fixed input/output pins
implemented in CPLD chips on several HTC devices. The original driver was written by Kevin O'Connor, I have adapted it to use gpiolib and made the bus/register widths configurable. Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include/linux/mfd/htc-egpio.h')
-rw-r--r--include/linux/mfd/htc-egpio.h57
1 files changed, 57 insertions, 0 deletions
diff --git a/include/linux/mfd/htc-egpio.h b/include/linux/mfd/htc-egpio.h
new file mode 100644
index 000000000000..b4201c971367
--- /dev/null
+++ b/include/linux/mfd/htc-egpio.h
@@ -0,0 +1,57 @@
1/*
2 * HTC simple EGPIO irq and gpio extender
3 */
4
5#ifndef __HTC_EGPIO_H__
6#define __HTC_EGPIO_H__
7
8#include <linux/gpio.h>
9
10/* Descriptive values for all-in or all-out htc_egpio_chip descriptors. */
11#define HTC_EGPIO_OUTPUT (~0)
12#define HTC_EGPIO_INPUT 0
13
14/**
15 * struct htc_egpio_chip - descriptor to create gpio_chip for register range
16 * @reg_start: index of first register
17 * @gpio_base: gpio number of first pin in this register range
18 * @num_gpios: number of gpios in this register range, max BITS_PER_LONG
19 * (number of registers = DIV_ROUND_UP(num_gpios, reg_width))
20 * @direction: bitfield, '0' = input, '1' = output,
21 */
22struct htc_egpio_chip {
23 int reg_start;
24 int gpio_base;
25 int num_gpios;
26 unsigned long direction;
27 unsigned long initial_values;
28};
29
30/**
31 * struct htc_egpio_platform_data - description provided by the arch
32 * @irq_base: beginning of available IRQs (eg, IRQ_BOARD_START)
33 * @num_irqs: number of irqs
34 * @reg_width: number of bits per register, either 8 or 16 bit
35 * @bus_width: alignment of the registers, either 16 or 32 bit
36 * @invert_acks: set if chip requires writing '0' to ack an irq, instead of '1'
37 * @ack_register: location of the irq/ack register
38 * @chip: pointer to array of htc_egpio_chip descriptors
39 * @num_chips: number of egpio chip descriptors
40 */
41struct htc_egpio_platform_data {
42 int bus_width;
43 int reg_width;
44
45 int irq_base;
46 int num_irqs;
47 int invert_acks;
48 int ack_register;
49
50 struct htc_egpio_chip *chip;
51 int num_chips;
52};
53
54/* Determine the wakeup irq, to be called during early resume */
55extern int htc_egpio_get_wakeup_irq(struct device *dev);
56
57#endif