mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
413b859e16
Commit 0998d06310
(device-core: Ensure drvdata = NULL when no
driver is bound) removes the need to set driver data field to
NULL.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Cc: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
660 lines
16 KiB
C
660 lines
16 KiB
C
/*
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* Samsung keypad driver
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*
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* Copyright (C) 2010 Samsung Electronics Co.Ltd
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* Author: Joonyoung Shim <jy0922.shim@samsung.com>
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* Author: Donghwa Lee <dh09.lee@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/sched.h>
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#include <linux/input/samsung-keypad.h>
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#define SAMSUNG_KEYIFCON 0x00
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#define SAMSUNG_KEYIFSTSCLR 0x04
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#define SAMSUNG_KEYIFCOL 0x08
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#define SAMSUNG_KEYIFROW 0x0c
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#define SAMSUNG_KEYIFFC 0x10
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/* SAMSUNG_KEYIFCON */
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#define SAMSUNG_KEYIFCON_INT_F_EN (1 << 0)
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#define SAMSUNG_KEYIFCON_INT_R_EN (1 << 1)
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#define SAMSUNG_KEYIFCON_DF_EN (1 << 2)
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#define SAMSUNG_KEYIFCON_FC_EN (1 << 3)
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#define SAMSUNG_KEYIFCON_WAKEUPEN (1 << 4)
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/* SAMSUNG_KEYIFSTSCLR */
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#define SAMSUNG_KEYIFSTSCLR_P_INT_MASK (0xff << 0)
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#define SAMSUNG_KEYIFSTSCLR_R_INT_MASK (0xff << 8)
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#define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET 8
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#define S5PV210_KEYIFSTSCLR_P_INT_MASK (0x3fff << 0)
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#define S5PV210_KEYIFSTSCLR_R_INT_MASK (0x3fff << 16)
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#define S5PV210_KEYIFSTSCLR_R_INT_OFFSET 16
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/* SAMSUNG_KEYIFCOL */
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#define SAMSUNG_KEYIFCOL_MASK (0xff << 0)
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#define S5PV210_KEYIFCOLEN_MASK (0xff << 8)
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/* SAMSUNG_KEYIFROW */
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#define SAMSUNG_KEYIFROW_MASK (0xff << 0)
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#define S5PV210_KEYIFROW_MASK (0x3fff << 0)
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/* SAMSUNG_KEYIFFC */
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#define SAMSUNG_KEYIFFC_MASK (0x3ff << 0)
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enum samsung_keypad_type {
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KEYPAD_TYPE_SAMSUNG,
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KEYPAD_TYPE_S5PV210,
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};
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struct samsung_keypad {
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struct input_dev *input_dev;
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struct platform_device *pdev;
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struct clk *clk;
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void __iomem *base;
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wait_queue_head_t wait;
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bool stopped;
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bool wake_enabled;
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int irq;
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enum samsung_keypad_type type;
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unsigned int row_shift;
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unsigned int rows;
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unsigned int cols;
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unsigned int row_state[SAMSUNG_MAX_COLS];
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#ifdef CONFIG_OF
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int row_gpios[SAMSUNG_MAX_ROWS];
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int col_gpios[SAMSUNG_MAX_COLS];
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#endif
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unsigned short keycodes[];
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};
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static void samsung_keypad_scan(struct samsung_keypad *keypad,
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unsigned int *row_state)
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{
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unsigned int col;
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unsigned int val;
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for (col = 0; col < keypad->cols; col++) {
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if (keypad->type == KEYPAD_TYPE_S5PV210) {
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val = S5PV210_KEYIFCOLEN_MASK;
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val &= ~(1 << col) << 8;
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} else {
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val = SAMSUNG_KEYIFCOL_MASK;
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val &= ~(1 << col);
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}
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writel(val, keypad->base + SAMSUNG_KEYIFCOL);
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mdelay(1);
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val = readl(keypad->base + SAMSUNG_KEYIFROW);
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row_state[col] = ~val & ((1 << keypad->rows) - 1);
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}
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/* KEYIFCOL reg clear */
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writel(0, keypad->base + SAMSUNG_KEYIFCOL);
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}
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static bool samsung_keypad_report(struct samsung_keypad *keypad,
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unsigned int *row_state)
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{
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struct input_dev *input_dev = keypad->input_dev;
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unsigned int changed;
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unsigned int pressed;
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unsigned int key_down = 0;
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unsigned int val;
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unsigned int col, row;
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for (col = 0; col < keypad->cols; col++) {
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changed = row_state[col] ^ keypad->row_state[col];
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key_down |= row_state[col];
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if (!changed)
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continue;
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for (row = 0; row < keypad->rows; row++) {
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if (!(changed & (1 << row)))
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continue;
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pressed = row_state[col] & (1 << row);
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dev_dbg(&keypad->input_dev->dev,
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"key %s, row: %d, col: %d\n",
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pressed ? "pressed" : "released", row, col);
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val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
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input_event(input_dev, EV_MSC, MSC_SCAN, val);
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input_report_key(input_dev,
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keypad->keycodes[val], pressed);
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}
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input_sync(keypad->input_dev);
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}
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memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));
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return key_down;
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}
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static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
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{
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struct samsung_keypad *keypad = dev_id;
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unsigned int row_state[SAMSUNG_MAX_COLS];
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unsigned int val;
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bool key_down;
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pm_runtime_get_sync(&keypad->pdev->dev);
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do {
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val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
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/* Clear interrupt. */
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writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
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samsung_keypad_scan(keypad, row_state);
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key_down = samsung_keypad_report(keypad, row_state);
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if (key_down)
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wait_event_timeout(keypad->wait, keypad->stopped,
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msecs_to_jiffies(50));
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} while (key_down && !keypad->stopped);
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pm_runtime_put(&keypad->pdev->dev);
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return IRQ_HANDLED;
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}
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static void samsung_keypad_start(struct samsung_keypad *keypad)
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{
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unsigned int val;
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pm_runtime_get_sync(&keypad->pdev->dev);
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/* Tell IRQ thread that it may poll the device. */
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keypad->stopped = false;
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clk_enable(keypad->clk);
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/* Enable interrupt bits. */
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val = readl(keypad->base + SAMSUNG_KEYIFCON);
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val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN;
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writel(val, keypad->base + SAMSUNG_KEYIFCON);
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/* KEYIFCOL reg clear. */
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writel(0, keypad->base + SAMSUNG_KEYIFCOL);
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pm_runtime_put(&keypad->pdev->dev);
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}
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static void samsung_keypad_stop(struct samsung_keypad *keypad)
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{
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unsigned int val;
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pm_runtime_get_sync(&keypad->pdev->dev);
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/* Signal IRQ thread to stop polling and disable the handler. */
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keypad->stopped = true;
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wake_up(&keypad->wait);
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disable_irq(keypad->irq);
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/* Clear interrupt. */
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writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
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/* Disable interrupt bits. */
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val = readl(keypad->base + SAMSUNG_KEYIFCON);
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val &= ~(SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN);
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writel(val, keypad->base + SAMSUNG_KEYIFCON);
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clk_disable(keypad->clk);
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/*
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* Now that chip should not generate interrupts we can safely
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* re-enable the handler.
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*/
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enable_irq(keypad->irq);
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pm_runtime_put(&keypad->pdev->dev);
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}
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static int samsung_keypad_open(struct input_dev *input_dev)
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{
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struct samsung_keypad *keypad = input_get_drvdata(input_dev);
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samsung_keypad_start(keypad);
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return 0;
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}
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static void samsung_keypad_close(struct input_dev *input_dev)
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{
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struct samsung_keypad *keypad = input_get_drvdata(input_dev);
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samsung_keypad_stop(keypad);
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}
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#ifdef CONFIG_OF
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static struct samsung_keypad_platdata *samsung_keypad_parse_dt(
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struct device *dev)
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{
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struct samsung_keypad_platdata *pdata;
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struct matrix_keymap_data *keymap_data;
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uint32_t *keymap, num_rows = 0, num_cols = 0;
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struct device_node *np = dev->of_node, *key_np;
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unsigned int key_count;
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata) {
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dev_err(dev, "could not allocate memory for platform data\n");
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return NULL;
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}
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of_property_read_u32(np, "samsung,keypad-num-rows", &num_rows);
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of_property_read_u32(np, "samsung,keypad-num-columns", &num_cols);
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if (!num_rows || !num_cols) {
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dev_err(dev, "number of keypad rows/columns not specified\n");
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return NULL;
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}
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pdata->rows = num_rows;
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pdata->cols = num_cols;
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keymap_data = devm_kzalloc(dev, sizeof(*keymap_data), GFP_KERNEL);
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if (!keymap_data) {
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dev_err(dev, "could not allocate memory for keymap data\n");
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return NULL;
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}
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pdata->keymap_data = keymap_data;
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key_count = of_get_child_count(np);
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keymap_data->keymap_size = key_count;
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keymap = devm_kzalloc(dev, sizeof(uint32_t) * key_count, GFP_KERNEL);
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if (!keymap) {
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dev_err(dev, "could not allocate memory for keymap\n");
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return NULL;
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}
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keymap_data->keymap = keymap;
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for_each_child_of_node(np, key_np) {
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u32 row, col, key_code;
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of_property_read_u32(key_np, "keypad,row", &row);
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of_property_read_u32(key_np, "keypad,column", &col);
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of_property_read_u32(key_np, "linux,code", &key_code);
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*keymap++ = KEY(row, col, key_code);
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}
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if (of_get_property(np, "linux,input-no-autorepeat", NULL))
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pdata->no_autorepeat = true;
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if (of_get_property(np, "linux,input-wakeup", NULL))
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pdata->wakeup = true;
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return pdata;
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}
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static void samsung_keypad_parse_dt_gpio(struct device *dev,
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struct samsung_keypad *keypad)
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{
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struct device_node *np = dev->of_node;
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int gpio, error, row, col;
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for (row = 0; row < keypad->rows; row++) {
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gpio = of_get_named_gpio(np, "row-gpios", row);
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keypad->row_gpios[row] = gpio;
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if (!gpio_is_valid(gpio)) {
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dev_err(dev, "keypad row[%d]: invalid gpio %d\n",
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row, gpio);
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continue;
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}
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error = devm_gpio_request(dev, gpio, "keypad-row");
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if (error)
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dev_err(dev,
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"keypad row[%d] gpio request failed: %d\n",
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row, error);
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}
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for (col = 0; col < keypad->cols; col++) {
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gpio = of_get_named_gpio(np, "col-gpios", col);
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keypad->col_gpios[col] = gpio;
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if (!gpio_is_valid(gpio)) {
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dev_err(dev, "keypad column[%d]: invalid gpio %d\n",
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col, gpio);
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continue;
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}
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error = devm_gpio_request(dev, gpio, "keypad-col");
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if (error)
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dev_err(dev,
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"keypad column[%d] gpio request failed: %d\n",
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col, error);
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}
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}
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#else
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static
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struct samsung_keypad_platdata *samsung_keypad_parse_dt(struct device *dev)
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{
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return NULL;
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}
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#endif
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static int samsung_keypad_probe(struct platform_device *pdev)
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{
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const struct samsung_keypad_platdata *pdata;
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const struct matrix_keymap_data *keymap_data;
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struct samsung_keypad *keypad;
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struct resource *res;
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struct input_dev *input_dev;
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unsigned int row_shift;
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unsigned int keymap_size;
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int error;
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if (pdev->dev.of_node)
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pdata = samsung_keypad_parse_dt(&pdev->dev);
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else
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(&pdev->dev, "no platform data defined\n");
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return -EINVAL;
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}
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keymap_data = pdata->keymap_data;
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if (!keymap_data) {
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dev_err(&pdev->dev, "no keymap data defined\n");
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return -EINVAL;
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}
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if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
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return -EINVAL;
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if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
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return -EINVAL;
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/* initialize the gpio */
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if (pdata->cfg_gpio)
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pdata->cfg_gpio(pdata->rows, pdata->cols);
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row_shift = get_count_order(pdata->cols);
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keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
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keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad) + keymap_size,
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GFP_KERNEL);
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input_dev = devm_input_allocate_device(&pdev->dev);
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if (!keypad || !input_dev)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENODEV;
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keypad->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
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if (!keypad->base)
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return -EBUSY;
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keypad->clk = devm_clk_get(&pdev->dev, "keypad");
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if (IS_ERR(keypad->clk)) {
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dev_err(&pdev->dev, "failed to get keypad clk\n");
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return PTR_ERR(keypad->clk);
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}
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error = clk_prepare(keypad->clk);
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if (error) {
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dev_err(&pdev->dev, "keypad clock prepare failed\n");
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return error;
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}
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keypad->input_dev = input_dev;
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keypad->pdev = pdev;
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keypad->row_shift = row_shift;
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keypad->rows = pdata->rows;
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keypad->cols = pdata->cols;
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keypad->stopped = true;
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init_waitqueue_head(&keypad->wait);
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if (pdev->dev.of_node) {
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#ifdef CONFIG_OF
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samsung_keypad_parse_dt_gpio(&pdev->dev, keypad);
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keypad->type = of_device_is_compatible(pdev->dev.of_node,
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"samsung,s5pv210-keypad");
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#endif
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} else {
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keypad->type = platform_get_device_id(pdev)->driver_data;
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}
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input_dev->name = pdev->name;
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input_dev->id.bustype = BUS_HOST;
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input_dev->dev.parent = &pdev->dev;
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input_dev->open = samsung_keypad_open;
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input_dev->close = samsung_keypad_close;
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error = matrix_keypad_build_keymap(keymap_data, NULL,
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pdata->rows, pdata->cols,
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keypad->keycodes, input_dev);
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if (error) {
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dev_err(&pdev->dev, "failed to build keymap\n");
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goto err_unprepare_clk;
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}
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input_set_capability(input_dev, EV_MSC, MSC_SCAN);
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if (!pdata->no_autorepeat)
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__set_bit(EV_REP, input_dev->evbit);
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input_set_drvdata(input_dev, keypad);
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keypad->irq = platform_get_irq(pdev, 0);
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if (keypad->irq < 0) {
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error = keypad->irq;
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goto err_unprepare_clk;
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}
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error = devm_request_threaded_irq(&pdev->dev, keypad->irq, NULL,
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samsung_keypad_irq, IRQF_ONESHOT,
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dev_name(&pdev->dev), keypad);
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if (error) {
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dev_err(&pdev->dev, "failed to register keypad interrupt\n");
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goto err_unprepare_clk;
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}
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device_init_wakeup(&pdev->dev, pdata->wakeup);
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platform_set_drvdata(pdev, keypad);
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pm_runtime_enable(&pdev->dev);
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error = input_register_device(keypad->input_dev);
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if (error)
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goto err_disable_runtime_pm;
|
|
|
|
if (pdev->dev.of_node) {
|
|
devm_kfree(&pdev->dev, (void *)pdata->keymap_data->keymap);
|
|
devm_kfree(&pdev->dev, (void *)pdata->keymap_data);
|
|
devm_kfree(&pdev->dev, (void *)pdata);
|
|
}
|
|
return 0;
|
|
|
|
err_disable_runtime_pm:
|
|
pm_runtime_disable(&pdev->dev);
|
|
device_init_wakeup(&pdev->dev, 0);
|
|
err_unprepare_clk:
|
|
clk_unprepare(keypad->clk);
|
|
return error;
|
|
}
|
|
|
|
static int samsung_keypad_remove(struct platform_device *pdev)
|
|
{
|
|
struct samsung_keypad *keypad = platform_get_drvdata(pdev);
|
|
|
|
pm_runtime_disable(&pdev->dev);
|
|
device_init_wakeup(&pdev->dev, 0);
|
|
|
|
input_unregister_device(keypad->input_dev);
|
|
|
|
clk_unprepare(keypad->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_RUNTIME
|
|
static int samsung_keypad_runtime_suspend(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct samsung_keypad *keypad = platform_get_drvdata(pdev);
|
|
unsigned int val;
|
|
int error;
|
|
|
|
if (keypad->stopped)
|
|
return 0;
|
|
|
|
/* This may fail on some SoCs due to lack of controller support */
|
|
error = enable_irq_wake(keypad->irq);
|
|
if (!error)
|
|
keypad->wake_enabled = true;
|
|
|
|
val = readl(keypad->base + SAMSUNG_KEYIFCON);
|
|
val |= SAMSUNG_KEYIFCON_WAKEUPEN;
|
|
writel(val, keypad->base + SAMSUNG_KEYIFCON);
|
|
|
|
clk_disable(keypad->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int samsung_keypad_runtime_resume(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct samsung_keypad *keypad = platform_get_drvdata(pdev);
|
|
unsigned int val;
|
|
|
|
if (keypad->stopped)
|
|
return 0;
|
|
|
|
clk_enable(keypad->clk);
|
|
|
|
val = readl(keypad->base + SAMSUNG_KEYIFCON);
|
|
val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
|
|
writel(val, keypad->base + SAMSUNG_KEYIFCON);
|
|
|
|
if (keypad->wake_enabled)
|
|
disable_irq_wake(keypad->irq);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
|
|
bool enable)
|
|
{
|
|
unsigned int val;
|
|
|
|
clk_enable(keypad->clk);
|
|
|
|
val = readl(keypad->base + SAMSUNG_KEYIFCON);
|
|
if (enable) {
|
|
val |= SAMSUNG_KEYIFCON_WAKEUPEN;
|
|
if (device_may_wakeup(&keypad->pdev->dev))
|
|
enable_irq_wake(keypad->irq);
|
|
} else {
|
|
val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
|
|
if (device_may_wakeup(&keypad->pdev->dev))
|
|
disable_irq_wake(keypad->irq);
|
|
}
|
|
writel(val, keypad->base + SAMSUNG_KEYIFCON);
|
|
|
|
clk_disable(keypad->clk);
|
|
}
|
|
|
|
static int samsung_keypad_suspend(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct samsung_keypad *keypad = platform_get_drvdata(pdev);
|
|
struct input_dev *input_dev = keypad->input_dev;
|
|
|
|
mutex_lock(&input_dev->mutex);
|
|
|
|
if (input_dev->users)
|
|
samsung_keypad_stop(keypad);
|
|
|
|
samsung_keypad_toggle_wakeup(keypad, true);
|
|
|
|
mutex_unlock(&input_dev->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int samsung_keypad_resume(struct device *dev)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct samsung_keypad *keypad = platform_get_drvdata(pdev);
|
|
struct input_dev *input_dev = keypad->input_dev;
|
|
|
|
mutex_lock(&input_dev->mutex);
|
|
|
|
samsung_keypad_toggle_wakeup(keypad, false);
|
|
|
|
if (input_dev->users)
|
|
samsung_keypad_start(keypad);
|
|
|
|
mutex_unlock(&input_dev->mutex);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static const struct dev_pm_ops samsung_keypad_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(samsung_keypad_suspend, samsung_keypad_resume)
|
|
SET_RUNTIME_PM_OPS(samsung_keypad_runtime_suspend,
|
|
samsung_keypad_runtime_resume, NULL)
|
|
};
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id samsung_keypad_dt_match[] = {
|
|
{ .compatible = "samsung,s3c6410-keypad" },
|
|
{ .compatible = "samsung,s5pv210-keypad" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, samsung_keypad_dt_match);
|
|
#endif
|
|
|
|
static struct platform_device_id samsung_keypad_driver_ids[] = {
|
|
{
|
|
.name = "samsung-keypad",
|
|
.driver_data = KEYPAD_TYPE_SAMSUNG,
|
|
}, {
|
|
.name = "s5pv210-keypad",
|
|
.driver_data = KEYPAD_TYPE_S5PV210,
|
|
},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);
|
|
|
|
static struct platform_driver samsung_keypad_driver = {
|
|
.probe = samsung_keypad_probe,
|
|
.remove = samsung_keypad_remove,
|
|
.driver = {
|
|
.name = "samsung-keypad",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = of_match_ptr(samsung_keypad_dt_match),
|
|
.pm = &samsung_keypad_pm_ops,
|
|
},
|
|
.id_table = samsung_keypad_driver_ids,
|
|
};
|
|
module_platform_driver(samsung_keypad_driver);
|
|
|
|
MODULE_DESCRIPTION("Samsung keypad driver");
|
|
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
|
|
MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
|
|
MODULE_LICENSE("GPL");
|