2009-09-22 05:17:04 +00:00
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/*
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* max7359_keypad.c - MAX7359 Key Switch Controller Driver
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*
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* Copyright (C) 2009 Samsung Electronics
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* Kim Kyuwon <q1.kim@samsung.com>
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*
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* Based on pxa27x_keypad.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Datasheet: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5456
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
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#include <linux/slab.h>
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2009-09-22 05:17:04 +00:00
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#include <linux/interrupt.h>
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2011-02-11 16:51:13 +00:00
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#include <linux/pm.h>
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2009-09-22 05:17:04 +00:00
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#include <linux/input.h>
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#include <linux/input/matrix_keypad.h>
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#define MAX7359_MAX_KEY_ROWS 8
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#define MAX7359_MAX_KEY_COLS 8
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#define MAX7359_MAX_KEY_NUM (MAX7359_MAX_KEY_ROWS * MAX7359_MAX_KEY_COLS)
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#define MAX7359_ROW_SHIFT 3
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/*
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* MAX7359 registers
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*/
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#define MAX7359_REG_KEYFIFO 0x00
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#define MAX7359_REG_CONFIG 0x01
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#define MAX7359_REG_DEBOUNCE 0x02
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#define MAX7359_REG_INTERRUPT 0x03
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#define MAX7359_REG_PORTS 0x04
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#define MAX7359_REG_KEYREP 0x05
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#define MAX7359_REG_SLEEP 0x06
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/*
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* Configuration register bits
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*/
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#define MAX7359_CFG_SLEEP (1 << 7)
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#define MAX7359_CFG_INTERRUPT (1 << 5)
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#define MAX7359_CFG_KEY_RELEASE (1 << 3)
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#define MAX7359_CFG_WAKEUP (1 << 1)
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#define MAX7359_CFG_TIMEOUT (1 << 0)
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/*
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* Autosleep register values (ms)
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*/
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#define MAX7359_AUTOSLEEP_8192 0x01
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#define MAX7359_AUTOSLEEP_4096 0x02
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#define MAX7359_AUTOSLEEP_2048 0x03
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#define MAX7359_AUTOSLEEP_1024 0x04
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#define MAX7359_AUTOSLEEP_512 0x05
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#define MAX7359_AUTOSLEEP_256 0x06
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struct max7359_keypad {
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/* matrix key code map */
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unsigned short keycodes[MAX7359_MAX_KEY_NUM];
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struct input_dev *input_dev;
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struct i2c_client *client;
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};
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static int max7359_write_reg(struct i2c_client *client, u8 reg, u8 val)
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{
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int ret = i2c_smbus_write_byte_data(client, reg, val);
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if (ret < 0)
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dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
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__func__, reg, val, ret);
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return ret;
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}
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static int max7359_read_reg(struct i2c_client *client, int reg)
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{
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int ret = i2c_smbus_read_byte_data(client, reg);
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if (ret < 0)
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dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
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__func__, reg, ret);
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return ret;
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}
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static void max7359_build_keycode(struct max7359_keypad *keypad,
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const struct matrix_keymap_data *keymap_data)
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{
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struct input_dev *input_dev = keypad->input_dev;
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int i;
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for (i = 0; i < keymap_data->keymap_size; i++) {
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unsigned int key = keymap_data->keymap[i];
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unsigned int row = KEY_ROW(key);
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unsigned int col = KEY_COL(key);
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unsigned int scancode = MATRIX_SCAN_CODE(row, col,
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MAX7359_ROW_SHIFT);
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unsigned short keycode = KEY_VAL(key);
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keypad->keycodes[scancode] = keycode;
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__set_bit(keycode, input_dev->keybit);
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}
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__clear_bit(KEY_RESERVED, input_dev->keybit);
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}
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2009-09-22 05:17:57 +00:00
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/* runs in an IRQ thread -- can (and will!) sleep */
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static irqreturn_t max7359_interrupt(int irq, void *dev_id)
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2009-09-22 05:17:04 +00:00
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{
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2009-09-22 05:17:57 +00:00
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struct max7359_keypad *keypad = dev_id;
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2009-09-22 05:17:04 +00:00
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struct input_dev *input_dev = keypad->input_dev;
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int val, row, col, release, code;
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val = max7359_read_reg(keypad->client, MAX7359_REG_KEYFIFO);
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row = val & 0x7;
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col = (val >> 3) & 0x7;
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release = val & 0x40;
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code = MATRIX_SCAN_CODE(row, col, MAX7359_ROW_SHIFT);
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2009-09-22 05:17:57 +00:00
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dev_dbg(&keypad->client->dev,
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"key[%d:%d] %s\n", row, col, release ? "release" : "press");
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2009-09-22 05:17:04 +00:00
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input_event(input_dev, EV_MSC, MSC_SCAN, code);
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input_report_key(input_dev, keypad->keycodes[code], !release);
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input_sync(input_dev);
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return IRQ_HANDLED;
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}
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/*
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* Let MAX7359 fall into a deep sleep:
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* If no keys are pressed, enter sleep mode for 8192 ms. And if any
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* key is pressed, the MAX7359 returns to normal operating mode.
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*/
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static inline void max7359_fall_deepsleep(struct i2c_client *client)
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{
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max7359_write_reg(client, MAX7359_REG_SLEEP, MAX7359_AUTOSLEEP_8192);
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}
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/*
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* Let MAX7359 take a catnap:
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* Autosleep just for 256 ms.
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*/
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static inline void max7359_take_catnap(struct i2c_client *client)
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{
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max7359_write_reg(client, MAX7359_REG_SLEEP, MAX7359_AUTOSLEEP_256);
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}
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static int max7359_open(struct input_dev *dev)
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{
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struct max7359_keypad *keypad = input_get_drvdata(dev);
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max7359_take_catnap(keypad->client);
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return 0;
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}
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static void max7359_close(struct input_dev *dev)
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{
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struct max7359_keypad *keypad = input_get_drvdata(dev);
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max7359_fall_deepsleep(keypad->client);
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}
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static void max7359_initialize(struct i2c_client *client)
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{
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max7359_write_reg(client, MAX7359_REG_CONFIG,
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MAX7359_CFG_INTERRUPT | /* Irq clears after host read */
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MAX7359_CFG_KEY_RELEASE | /* Key release enable */
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MAX7359_CFG_WAKEUP); /* Key press wakeup enable */
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/* Full key-scan functionality */
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max7359_write_reg(client, MAX7359_REG_DEBOUNCE, 0x1F);
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/* nINT asserts every debounce cycles */
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max7359_write_reg(client, MAX7359_REG_INTERRUPT, 0x01);
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max7359_fall_deepsleep(client);
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}
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2012-11-24 05:38:25 +00:00
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static int max7359_probe(struct i2c_client *client,
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2009-09-22 05:17:04 +00:00
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const struct i2c_device_id *id)
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{
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2013-12-06 03:21:10 +00:00
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const struct matrix_keymap_data *keymap_data =
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dev_get_platdata(&client->dev);
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2009-09-22 05:17:04 +00:00
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struct max7359_keypad *keypad;
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struct input_dev *input_dev;
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int ret;
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int error;
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if (!client->irq) {
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dev_err(&client->dev, "The irq number should not be zero\n");
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return -EINVAL;
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}
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/* Detect MAX7359: The initial Keys FIFO value is '0x3F' */
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ret = max7359_read_reg(client, MAX7359_REG_KEYFIFO);
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if (ret < 0) {
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dev_err(&client->dev, "failed to detect device\n");
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return -ENODEV;
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}
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dev_dbg(&client->dev, "keys FIFO is 0x%02x\n", ret);
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2014-07-19 23:16:02 +00:00
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keypad = devm_kzalloc(&client->dev, sizeof(struct max7359_keypad),
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GFP_KERNEL);
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if (!keypad) {
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2009-09-22 05:17:04 +00:00
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dev_err(&client->dev, "failed to allocate memory\n");
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2014-07-19 23:16:02 +00:00
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return -ENOMEM;
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}
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input_dev = devm_input_allocate_device(&client->dev);
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if (!input_dev) {
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dev_err(&client->dev, "failed to allocate input device\n");
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return -ENOMEM;
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2009-09-22 05:17:04 +00:00
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}
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keypad->client = client;
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keypad->input_dev = input_dev;
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input_dev->name = client->name;
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input_dev->id.bustype = BUS_I2C;
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input_dev->open = max7359_open;
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input_dev->close = max7359_close;
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input_dev->dev.parent = &client->dev;
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
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input_dev->keycodesize = sizeof(keypad->keycodes[0]);
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input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
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input_dev->keycode = keypad->keycodes;
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input_set_capability(input_dev, EV_MSC, MSC_SCAN);
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input_set_drvdata(input_dev, keypad);
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max7359_build_keycode(keypad, keymap_data);
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2014-07-19 23:16:02 +00:00
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error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
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max7359_interrupt,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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client->name, keypad);
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2009-09-22 05:17:04 +00:00
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if (error) {
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dev_err(&client->dev, "failed to register interrupt\n");
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2014-07-19 23:16:02 +00:00
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return error;
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2009-09-22 05:17:04 +00:00
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}
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/* Register the input device */
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error = input_register_device(input_dev);
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if (error) {
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dev_err(&client->dev, "failed to register input device\n");
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2014-07-19 23:16:02 +00:00
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return error;
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2009-09-22 05:17:04 +00:00
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}
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/* Initialize MAX7359 */
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max7359_initialize(client);
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i2c_set_clientdata(client, keypad);
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device_init_wakeup(&client->dev, 1);
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return 0;
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}
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2013-08-05 16:04:18 +00:00
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#ifdef CONFIG_PM_SLEEP
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2011-02-11 16:51:13 +00:00
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static int max7359_suspend(struct device *dev)
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2009-09-22 05:17:04 +00:00
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{
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2011-02-11 16:51:13 +00:00
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struct i2c_client *client = to_i2c_client(dev);
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2009-09-22 05:17:04 +00:00
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max7359_fall_deepsleep(client);
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if (device_may_wakeup(&client->dev))
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2009-09-22 05:17:57 +00:00
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enable_irq_wake(client->irq);
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2009-09-22 05:17:04 +00:00
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return 0;
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}
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2011-02-11 16:51:13 +00:00
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static int max7359_resume(struct device *dev)
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2009-09-22 05:17:04 +00:00
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{
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2011-02-11 16:51:13 +00:00
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struct i2c_client *client = to_i2c_client(dev);
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2009-09-22 05:17:04 +00:00
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if (device_may_wakeup(&client->dev))
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2009-09-22 05:17:57 +00:00
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disable_irq_wake(client->irq);
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2009-09-22 05:17:04 +00:00
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/* Restore the default setting */
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max7359_take_catnap(client);
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return 0;
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}
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#endif
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2011-02-11 16:51:13 +00:00
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static SIMPLE_DEV_PM_OPS(max7359_pm, max7359_suspend, max7359_resume);
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2009-09-22 05:17:04 +00:00
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static const struct i2c_device_id max7359_ids[] = {
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{ "max7359", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max7359_ids);
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static struct i2c_driver max7359_i2c_driver = {
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.driver = {
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.name = "max7359",
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2011-02-11 16:51:13 +00:00
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.pm = &max7359_pm,
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2009-09-22 05:17:04 +00:00
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},
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.probe = max7359_probe,
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.id_table = max7359_ids,
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};
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2012-03-17 06:05:41 +00:00
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module_i2c_driver(max7359_i2c_driver);
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2009-09-22 05:17:04 +00:00
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MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
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MODULE_DESCRIPTION("MAX7359 Key Switch Controller Driver");
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MODULE_LICENSE("GPL v2");
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