--- /dev/null
+/*
+ * Samsung keypad driver
+ *
+ * Copyright (C) 2010 Samsung Electronics Co.Ltd
+ * Author: Joonyoung Shim <jy0922.shim@samsung.com>
+ * Author: Donghwa Lee <dh09.lee@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/sched.h>
+#include <linux/input/samsung-keypad.h>
+
+#define SAMSUNG_KEYIFCON 0x00
+#define SAMSUNG_KEYIFSTSCLR 0x04
+#define SAMSUNG_KEYIFCOL 0x08
+#define SAMSUNG_KEYIFROW 0x0c
+#define SAMSUNG_KEYIFFC 0x10
+
+/* SAMSUNG_KEYIFCON */
+#define SAMSUNG_KEYIFCON_INT_F_EN (1 << 0)
+#define SAMSUNG_KEYIFCON_INT_R_EN (1 << 1)
+#define SAMSUNG_KEYIFCON_DF_EN (1 << 2)
+#define SAMSUNG_KEYIFCON_FC_EN (1 << 3)
+#define SAMSUNG_KEYIFCON_WAKEUPEN (1 << 4)
+
+/* SAMSUNG_KEYIFSTSCLR */
+#define SAMSUNG_KEYIFSTSCLR_P_INT_MASK (0xff << 0)
+#define SAMSUNG_KEYIFSTSCLR_R_INT_MASK (0xff << 8)
+#define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET 8
+#define S5PV210_KEYIFSTSCLR_P_INT_MASK (0x3fff << 0)
+#define S5PV210_KEYIFSTSCLR_R_INT_MASK (0x3fff << 16)
+#define S5PV210_KEYIFSTSCLR_R_INT_OFFSET 16
+
+/* SAMSUNG_KEYIFCOL */
+#define SAMSUNG_KEYIFCOL_MASK (0xff << 0)
+#define S5PV210_KEYIFCOLEN_MASK (0xff << 8)
+
+/* SAMSUNG_KEYIFROW */
+#define SAMSUNG_KEYIFROW_MASK (0xff << 0)
+#define S5PV210_KEYIFROW_MASK (0x3fff << 0)
+
+/* SAMSUNG_KEYIFFC */
+#define SAMSUNG_KEYIFFC_MASK (0x3ff << 0)
+
+enum samsung_keypad_type {
+ KEYPAD_TYPE_SAMSUNG,
+ KEYPAD_TYPE_S5PV210,
+};
+
+struct samsung_keypad {
+ struct input_dev *input_dev;
+ struct platform_device *pdev;
+ struct clk *clk;
+ void __iomem *base;
+ wait_queue_head_t wait;
+ bool stopped;
+ bool wake_enabled;
+ int irq;
+ enum samsung_keypad_type type;
+ unsigned int row_shift;
+ unsigned int rows;
+ unsigned int cols;
+ unsigned int row_state[SAMSUNG_MAX_COLS];
+ unsigned short keycodes[];
+};
+
+static void samsung_keypad_scan(struct samsung_keypad *keypad,
+ unsigned int *row_state)
+{
+ unsigned int col;
+ unsigned int val;
+
+ for (col = 0; col < keypad->cols; col++) {
+ if (keypad->type == KEYPAD_TYPE_S5PV210) {
+ val = S5PV210_KEYIFCOLEN_MASK;
+ val &= ~(1 << col) << 8;
+ } else {
+ val = SAMSUNG_KEYIFCOL_MASK;
+ val &= ~(1 << col);
+ }
+
+ writel(val, keypad->base + SAMSUNG_KEYIFCOL);
+ mdelay(1);
+
+ val = readl(keypad->base + SAMSUNG_KEYIFROW);
+ row_state[col] = ~val & ((1 << keypad->rows) - 1);
+ }
+
+ /* KEYIFCOL reg clear */
+ writel(0, keypad->base + SAMSUNG_KEYIFCOL);
+}
+
+static bool samsung_keypad_report(struct samsung_keypad *keypad,
+ unsigned int *row_state)
+{
+ struct input_dev *input_dev = keypad->input_dev;
+ unsigned int changed;
+ unsigned int pressed;
+ unsigned int key_down = 0;
+ unsigned int val;
+ unsigned int col, row;
+
+ for (col = 0; col < keypad->cols; col++) {
+ changed = row_state[col] ^ keypad->row_state[col];
+ key_down |= row_state[col];
+ if (!changed)
+ continue;
+
+ for (row = 0; row < keypad->rows; row++) {
+ if (!(changed & (1 << row)))
+ continue;
+
+ pressed = row_state[col] & (1 << row);
+
+ dev_dbg(&keypad->input_dev->dev,
+ "key %s, row: %d, col: %d\n",
+ pressed ? "pressed" : "released", row, col);
+
+ val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
+
+ input_event(input_dev, EV_MSC, MSC_SCAN, val);
+ input_report_key(input_dev,
+ keypad->keycodes[val], pressed);
+ }
+ input_sync(keypad->input_dev);
+ }
+
+ memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));
+
+ return key_down;
+}
+
+static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
+{
+ struct samsung_keypad *keypad = dev_id;
+ unsigned int row_state[SAMSUNG_MAX_COLS];
+ unsigned int val;
+ bool key_down;
+
+ pm_runtime_get_sync(&keypad->pdev->dev);
+
+ do {
+ val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
+ /* Clear interrupt. */
+ writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
+
+ samsung_keypad_scan(keypad, row_state);
+
+ key_down = samsung_keypad_report(keypad, row_state);
+ if (key_down)
+ wait_event_timeout(keypad->wait, keypad->stopped,
+ msecs_to_jiffies(50));
+
+ } while (key_down && !keypad->stopped);
+
+ pm_runtime_put(&keypad->pdev->dev);
+
+ return IRQ_HANDLED;
+}
+
+static void samsung_keypad_start(struct samsung_keypad *keypad)
+{
+ unsigned int val;
+
+ pm_runtime_get_sync(&keypad->pdev->dev);
+
+ /* Tell IRQ thread that it may poll the device. */
+ keypad->stopped = false;
+
+ clk_enable(keypad->clk);
+
+ /* Enable interrupt bits. */
+ val = readl(keypad->base + SAMSUNG_KEYIFCON);
+ val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN;
+ writel(val, keypad->base + SAMSUNG_KEYIFCON);
+
+ /* KEYIFCOL reg clear. */
+ writel(0, keypad->base + SAMSUNG_KEYIFCOL);
+
+ pm_runtime_put(&keypad->pdev->dev);
+}
+
+static void samsung_keypad_stop(struct samsung_keypad *keypad)
+{
+ unsigned int val;
+
+ pm_runtime_get_sync(&keypad->pdev->dev);
+
+ /* Signal IRQ thread to stop polling and disable the handler. */
+ keypad->stopped = true;
+ wake_up(&keypad->wait);
+ disable_irq(keypad->irq);
+
+ /* Clear interrupt. */
+ writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
+
+ /* Disable interrupt bits. */
+ val = readl(keypad->base + SAMSUNG_KEYIFCON);
+ val &= ~(SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN);
+ writel(val, keypad->base + SAMSUNG_KEYIFCON);
+
+ clk_disable(keypad->clk);
+
+ /*
+ * Now that chip should not generate interrupts we can safely
+ * re-enable the handler.
+ */
+ enable_irq(keypad->irq);
+
+ pm_runtime_put(&keypad->pdev->dev);
+}
+
+static int samsung_keypad_open(struct input_dev *input_dev)
+{
+ struct samsung_keypad *keypad = input_get_drvdata(input_dev);
+
+ samsung_keypad_start(keypad);
+
+ return 0;
+}
+
+static void samsung_keypad_close(struct input_dev *input_dev)
+{
+ struct samsung_keypad *keypad = input_get_drvdata(input_dev);
+
+ samsung_keypad_stop(keypad);
+}
+
+#ifdef CONFIG_OF
+static struct samsung_keypad_platdata *
+samsung_keypad_parse_dt(struct device *dev)
+{
+ struct samsung_keypad_platdata *pdata;
+ struct matrix_keymap_data *keymap_data;
+ uint32_t *keymap, num_rows = 0, num_cols = 0;
+ struct device_node *np = dev->of_node, *key_np;
+ unsigned int key_count;
+
+ if (!np) {
+ dev_err(dev, "missing device tree data\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata) {
+ dev_err(dev, "could not allocate memory for platform data\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ of_property_read_u32(np, "samsung,keypad-num-rows", &num_rows);
+ of_property_read_u32(np, "samsung,keypad-num-columns", &num_cols);
+ if (!num_rows || !num_cols) {
+ dev_err(dev, "number of keypad rows/columns not specified\n");
+ return ERR_PTR(-EINVAL);
+ }
+ pdata->rows = num_rows;
+ pdata->cols = num_cols;
+
+ keymap_data = devm_kzalloc(dev, sizeof(*keymap_data), GFP_KERNEL);
+ if (!keymap_data) {
+ dev_err(dev, "could not allocate memory for keymap data\n");
+ return ERR_PTR(-ENOMEM);
+ }
+ pdata->keymap_data = keymap_data;
+
+ key_count = of_get_child_count(np);
+ keymap_data->keymap_size = key_count;
+ keymap = devm_kzalloc(dev, sizeof(uint32_t) * key_count, GFP_KERNEL);
+ if (!keymap) {
+ dev_err(dev, "could not allocate memory for keymap\n");
+ return ERR_PTR(-ENOMEM);
+ }
+ keymap_data->keymap = keymap;
+
+ for_each_child_of_node(np, key_np) {
+ u32 row, col, key_code;
+ of_property_read_u32(key_np, "keypad,row", &row);
+ of_property_read_u32(key_np, "keypad,column", &col);
+ of_property_read_u32(key_np, "linux,code", &key_code);
+ *keymap++ = KEY(row, col, key_code);
+ }
+
+ if (of_get_property(np, "linux,input-no-autorepeat", NULL))
+ pdata->no_autorepeat = true;
+
+ if (of_get_property(np, "linux,input-wakeup", NULL))
+ pdata->wakeup = true;
+
+ return pdata;
+}
+#else
+static struct samsung_keypad_platdata *
+samsung_keypad_parse_dt(struct device *dev)
+{
+ dev_err(dev, "no platform data defined\n");
+
+ return ERR_PTR(-EINVAL);
+}
+#endif
+
+static int samsung_keypad_probe(struct platform_device *pdev)
+{
+ const struct samsung_keypad_platdata *pdata;
+ const struct matrix_keymap_data *keymap_data;
+ struct samsung_keypad *keypad;
+ struct resource *res;
+ struct input_dev *input_dev;
+ unsigned int row_shift;
+ unsigned int keymap_size;
+ int error;
+
+ pdata = dev_get_platdata(&pdev->dev);
+ if (!pdata) {
+ pdata = samsung_keypad_parse_dt(&pdev->dev);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+ }
+
+ keymap_data = pdata->keymap_data;
+ if (!keymap_data) {
+ dev_err(&pdev->dev, "no keymap data defined\n");
+ return -EINVAL;
+ }
+
+ if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
+ return -EINVAL;
+
+ if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
+ return -EINVAL;
+
+ /* initialize the gpio */
+ if (pdata->cfg_gpio)
+ pdata->cfg_gpio(pdata->rows, pdata->cols);
+
+ row_shift = get_count_order(pdata->cols);
+ keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
+
+ keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad) + keymap_size,
+ GFP_KERNEL);
+ input_dev = devm_input_allocate_device(&pdev->dev);
+ if (!keypad || !input_dev)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ keypad->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (!keypad->base)
+ return -EBUSY;
+
+ keypad->clk = devm_clk_get(&pdev->dev, "keypad");
+ if (IS_ERR(keypad->clk)) {
+ dev_err(&pdev->dev, "failed to get keypad clk\n");
+ return PTR_ERR(keypad->clk);
+ }
+
+ error = clk_prepare(keypad->clk);
+ if (error) {
+ dev_err(&pdev->dev, "keypad clock prepare failed\n");
+ return error;
+ }
+
+ keypad->input_dev = input_dev;
+ keypad->pdev = pdev;
+ keypad->row_shift = row_shift;
+ keypad->rows = pdata->rows;
+ keypad->cols = pdata->cols;
+ keypad->stopped = true;
+ init_waitqueue_head(&keypad->wait);
+
+ if (pdev->dev.of_node)
+ keypad->type = of_device_is_compatible(pdev->dev.of_node,
+ "samsung,s5pv210-keypad");
+ else
+ keypad->type = platform_get_device_id(pdev)->driver_data;
+
+ input_dev->name = pdev->name;
+ input_dev->id.bustype = BUS_HOST;
+ input_dev->dev.parent = &pdev->dev;
+
+ input_dev->open = samsung_keypad_open;
+ input_dev->close = samsung_keypad_close;
+
+ error = matrix_keypad_build_keymap(keymap_data, NULL,
+ pdata->rows, pdata->cols,
+ keypad->keycodes, input_dev);
+ if (error) {
+ dev_err(&pdev->dev, "failed to build keymap\n");
+ goto err_unprepare_clk;
+ }
+
+ input_set_capability(input_dev, EV_MSC, MSC_SCAN);
+ if (!pdata->no_autorepeat)
+ __set_bit(EV_REP, input_dev->evbit);
+
+ input_set_drvdata(input_dev, keypad);
+
+ keypad->irq = platform_get_irq(pdev, 0);
+ if (keypad->irq < 0) {
+ error = keypad->irq;
+ goto err_unprepare_clk;
+ }
+
+ error = devm_request_threaded_irq(&pdev->dev, keypad->irq, NULL,
+ samsung_keypad_irq, IRQF_ONESHOT,
+ dev_name(&pdev->dev), keypad);
+ if (error) {
+ dev_err(&pdev->dev, "failed to register keypad interrupt\n");
+ goto err_unprepare_clk;
+ }
+
+ device_init_wakeup(&pdev->dev, pdata->wakeup);
+ platform_set_drvdata(pdev, keypad);
+ pm_runtime_enable(&pdev->dev);
+
+ error = input_register_device(keypad->input_dev);
+ if (error)
+ 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
+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",
+ .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");
Code Review / kvmfornfv.git / blobdiff