+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) ST-Ericsson SA 2010
- *
- * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
- * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
- *
- * Keypad controller driver for the SKE (Scroll Key Encoder) module used in
- * the Nomadik 8815 and Ux500 platforms.
- */
-
-#include <linux/platform_device.h>
-#include <linux/interrupt.h>
-#include <linux/spinlock.h>
-#include <linux/io.h>
-#include <linux/delay.h>
-#include <linux/input.h>
-#include <linux/slab.h>
-#include <linux/clk.h>
-#include <linux/module.h>
-
-#include <linux/platform_data/keypad-nomadik-ske.h>
-
-/* SKE_CR bits */
-#define SKE_KPMLT (0x1 << 6)
-#define SKE_KPCN (0x7 << 3)
-#define SKE_KPASEN (0x1 << 2)
-#define SKE_KPASON (0x1 << 7)
-
-/* SKE_IMSC bits */
-#define SKE_KPIMA (0x1 << 2)
-
-/* SKE_ICR bits */
-#define SKE_KPICS (0x1 << 3)
-#define SKE_KPICA (0x1 << 2)
-
-/* SKE_RIS bits */
-#define SKE_KPRISA (0x1 << 2)
-
-#define SKE_KEYPAD_ROW_SHIFT 3
-#define SKE_KPD_NUM_ROWS 8
-#define SKE_KPD_NUM_COLS 8
-
-/* keypad auto scan registers */
-#define SKE_ASR0 0x20
-#define SKE_ASR1 0x24
-#define SKE_ASR2 0x28
-#define SKE_ASR3 0x2C
-
-#define SKE_NUM_ASRX_REGISTERS (4)
-#define KEY_PRESSED_DELAY 10
-
-/**
- * struct ske_keypad - data structure used by keypad driver
- * @irq: irq no
- * @reg_base: ske registers base address
- * @input: pointer to input device object
- * @board: keypad platform device
- * @keymap: matrix scan code table for keycodes
- * @clk: clock structure pointer
- * @pclk: clock structure pointer
- * @ske_keypad_lock: spinlock protecting the keypad read/writes
- */
-struct ske_keypad {
- int irq;
- void __iomem *reg_base;
- struct input_dev *input;
- const struct ske_keypad_platform_data *board;
- unsigned short keymap[SKE_KPD_NUM_ROWS * SKE_KPD_NUM_COLS];
- struct clk *clk;
- struct clk *pclk;
- spinlock_t ske_keypad_lock;
-};
-
-static void ske_keypad_set_bits(struct ske_keypad *keypad, u16 addr,
- u8 mask, u8 data)
-{
- u32 ret;
-
- spin_lock(&keypad->ske_keypad_lock);
-
- ret = readl(keypad->reg_base + addr);
- ret &= ~mask;
- ret |= data;
- writel(ret, keypad->reg_base + addr);
-
- spin_unlock(&keypad->ske_keypad_lock);
-}
-
-/*
- * ske_keypad_chip_init: init keypad controller configuration
- *
- * Enable Multi key press detection, auto scan mode
- */
-static int __init ske_keypad_chip_init(struct ske_keypad *keypad)
-{
- u32 value;
- int timeout = keypad->board->debounce_ms;
-
- /* check SKE_RIS to be 0 */
- while ((readl(keypad->reg_base + SKE_RIS) != 0x00000000) && timeout--)
- cpu_relax();
-
- if (timeout == -1)
- return -EINVAL;
-
- /*
- * set debounce value
- * keypad dbounce is configured in DBCR[15:8]
- * dbounce value in steps of 32/32.768 ms
- */
- spin_lock(&keypad->ske_keypad_lock);
- value = readl(keypad->reg_base + SKE_DBCR);
- value = value & 0xff;
- value |= ((keypad->board->debounce_ms * 32000)/32768) << 8;
- writel(value, keypad->reg_base + SKE_DBCR);
- spin_unlock(&keypad->ske_keypad_lock);
-
- /* enable multi key detection */
- ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPMLT);
-
- /*
- * set up the number of columns
- * KPCN[5:3] defines no. of keypad columns to be auto scanned
- */
- value = (keypad->board->kcol - 1) << 3;
- ske_keypad_set_bits(keypad, SKE_CR, SKE_KPCN, value);
-
- /* clear keypad interrupt for auto(and pending SW) scans */
- ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA | SKE_KPICS);
-
- /* un-mask keypad interrupts */
- ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
-
- /* enable automatic scan */
- ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPASEN);
-
- return 0;
-}
-
-static void ske_keypad_report(struct ske_keypad *keypad, u8 status, int col)
-{
- int row = 0, code, pos;
- struct input_dev *input = keypad->input;
- u32 ske_ris;
- int key_pressed;
- int num_of_rows;
-
- /* find out the row */
- num_of_rows = hweight8(status);
- do {
- pos = __ffs(status);
- row = pos;
- status &= ~(1 << pos);
-
- code = MATRIX_SCAN_CODE(row, col, SKE_KEYPAD_ROW_SHIFT);
- ske_ris = readl(keypad->reg_base + SKE_RIS);
- key_pressed = ske_ris & SKE_KPRISA;
-
- input_event(input, EV_MSC, MSC_SCAN, code);
- input_report_key(input, keypad->keymap[code], key_pressed);
- input_sync(input);
- num_of_rows--;
- } while (num_of_rows);
-}
-
-static void ske_keypad_read_data(struct ske_keypad *keypad)
-{
- u8 status;
- int col = 0;
- int ske_asr, i;
-
- /*
- * Read the auto scan registers
- *
- * Each SKE_ASRx (x=0 to x=3) contains two row values.
- * lower byte contains row value for column 2*x,
- * upper byte contains row value for column 2*x + 1
- */
- for (i = 0; i < SKE_NUM_ASRX_REGISTERS; i++) {
- ske_asr = readl(keypad->reg_base + SKE_ASR0 + (4 * i));
- if (!ske_asr)
- continue;
-
- /* now that ASRx is zero, find out the coloumn x and row y */
- status = ske_asr & 0xff;
- if (status) {
- col = i * 2;
- ske_keypad_report(keypad, status, col);
- }
- status = (ske_asr & 0xff00) >> 8;
- if (status) {
- col = (i * 2) + 1;
- ske_keypad_report(keypad, status, col);
- }
- }
-}
-
-static irqreturn_t ske_keypad_irq(int irq, void *dev_id)
-{
- struct ske_keypad *keypad = dev_id;
- int timeout = keypad->board->debounce_ms;
-
- /* disable auto scan interrupt; mask the interrupt generated */
- ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
- ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA);
-
- while ((readl(keypad->reg_base + SKE_CR) & SKE_KPASON) && --timeout)
- cpu_relax();
-
- /* SKEx registers are stable and can be read */
- ske_keypad_read_data(keypad);
-
- /* wait until raw interrupt is clear */
- while ((readl(keypad->reg_base + SKE_RIS)) && --timeout)
- msleep(KEY_PRESSED_DELAY);
-
- /* enable auto scan interrupts */
- ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
-
- return IRQ_HANDLED;
-}
-
-static void ske_keypad_board_exit(void *data)
-{
- struct ske_keypad *keypad = data;
-
- keypad->board->exit();
-}
-
-static int __init ske_keypad_probe(struct platform_device *pdev)
-{
- const struct ske_keypad_platform_data *plat =
- dev_get_platdata(&pdev->dev);
- struct device *dev = &pdev->dev;
- struct ske_keypad *keypad;
- struct input_dev *input;
- int irq;
- int error;
-
- if (!plat) {
- dev_err(&pdev->dev, "invalid keypad platform data\n");
- return -EINVAL;
- }
-
- irq = platform_get_irq(pdev, 0);
- if (irq < 0)
- return irq;
-
- keypad = devm_kzalloc(dev, sizeof(struct ske_keypad),
- GFP_KERNEL);
- input = devm_input_allocate_device(dev);
- if (!keypad || !input) {
- dev_err(&pdev->dev, "failed to allocate keypad memory\n");
- return -ENOMEM;
- }
-
- keypad->irq = irq;
- keypad->board = plat;
- keypad->input = input;
- spin_lock_init(&keypad->ske_keypad_lock);
-
- keypad->reg_base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(keypad->reg_base))
- return PTR_ERR(keypad->reg_base);
-
- keypad->pclk = devm_clk_get_enabled(dev, "apb_pclk");
- if (IS_ERR(keypad->pclk)) {
- dev_err(&pdev->dev, "failed to get pclk\n");
- return PTR_ERR(keypad->pclk);
- }
-
- keypad->clk = devm_clk_get_enabled(dev, NULL);
- if (IS_ERR(keypad->clk)) {
- dev_err(&pdev->dev, "failed to get clk\n");
- return PTR_ERR(keypad->clk);
- }
-
- input->id.bustype = BUS_HOST;
- input->name = "ux500-ske-keypad";
- input->dev.parent = &pdev->dev;
-
- error = matrix_keypad_build_keymap(plat->keymap_data, NULL,
- SKE_KPD_NUM_ROWS, SKE_KPD_NUM_COLS,
- keypad->keymap, input);
- if (error) {
- dev_err(&pdev->dev, "Failed to build keymap\n");
- return error;
- }
-
- input_set_capability(input, EV_MSC, MSC_SCAN);
- if (!plat->no_autorepeat)
- __set_bit(EV_REP, input->evbit);
-
- /* go through board initialization helpers */
- if (keypad->board->init)
- keypad->board->init();
-
- if (keypad->board->exit) {
- error = devm_add_action_or_reset(dev, ske_keypad_board_exit,
- keypad);
- if (error)
- return error;
- }
-
- error = ske_keypad_chip_init(keypad);
- if (error) {
- dev_err(&pdev->dev, "unable to init keypad hardware\n");
- return error;
- }
-
- error = devm_request_threaded_irq(dev, keypad->irq,
- NULL, ske_keypad_irq,
- IRQF_ONESHOT, "ske-keypad", keypad);
- if (error) {
- dev_err(&pdev->dev, "allocate irq %d failed\n", keypad->irq);
- return error;
- }
-
- error = input_register_device(input);
- if (error) {
- dev_err(&pdev->dev,
- "unable to register input device: %d\n", error);
- return error;
- }
-
- if (plat->wakeup_enable)
- device_init_wakeup(&pdev->dev, true);
-
- platform_set_drvdata(pdev, keypad);
-
- return 0;
-}
-
-static int ske_keypad_suspend(struct device *dev)
-{
- struct platform_device *pdev = to_platform_device(dev);
- struct ske_keypad *keypad = platform_get_drvdata(pdev);
- int irq = platform_get_irq(pdev, 0);
-
- if (device_may_wakeup(dev))
- enable_irq_wake(irq);
- else
- ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0);
-
- return 0;
-}
-
-static int ske_keypad_resume(struct device *dev)
-{
- struct platform_device *pdev = to_platform_device(dev);
- struct ske_keypad *keypad = platform_get_drvdata(pdev);
- int irq = platform_get_irq(pdev, 0);
-
- if (device_may_wakeup(dev))
- disable_irq_wake(irq);
- else
- ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA);
-
- return 0;
-}
-
-static DEFINE_SIMPLE_DEV_PM_OPS(ske_keypad_dev_pm_ops,
- ske_keypad_suspend, ske_keypad_resume);
-
-static struct platform_driver ske_keypad_driver = {
- .driver = {
- .name = "nmk-ske-keypad",
- .pm = pm_sleep_ptr(&ske_keypad_dev_pm_ops),
- },
-};
-
-module_platform_driver_probe(ske_keypad_driver, ske_keypad_probe);
-
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Naveen Kumar <naveen.gaddipati@stericsson.com> / Sundar Iyer <sundar.iyer@stericsson.com>");
-MODULE_DESCRIPTION("Nomadik Scroll-Key-Encoder Keypad Driver");
-MODULE_ALIAS("platform:nomadik-ske-keypad");
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