| /* |
| * 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 const 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"); |