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271 lines
6.4 KiB
271 lines
6.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* STMicroelectronics Key Scanning driver |
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* |
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* Copyright (c) 2014 STMicroelectonics Ltd. |
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* Author: Stuart Menefy <[email protected]> |
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* |
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* Based on sh_keysc.c, copyright 2008 Magnus Damm |
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*/ |
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#include <linux/module.h> |
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#include <linux/interrupt.h> |
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#include <linux/platform_device.h> |
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#include <linux/clk.h> |
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#include <linux/io.h> |
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#include <linux/input/matrix_keypad.h> |
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#define ST_KEYSCAN_MAXKEYS 16 |
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#define KEYSCAN_CONFIG_OFF 0x0 |
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#define KEYSCAN_CONFIG_ENABLE 0x1 |
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#define KEYSCAN_DEBOUNCE_TIME_OFF 0x4 |
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#define KEYSCAN_MATRIX_STATE_OFF 0x8 |
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#define KEYSCAN_MATRIX_DIM_OFF 0xc |
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#define KEYSCAN_MATRIX_DIM_X_SHIFT 0x0 |
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#define KEYSCAN_MATRIX_DIM_Y_SHIFT 0x2 |
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struct st_keyscan { |
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void __iomem *base; |
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int irq; |
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struct clk *clk; |
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struct input_dev *input_dev; |
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unsigned long last_state; |
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unsigned int n_rows; |
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unsigned int n_cols; |
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unsigned int debounce_us; |
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}; |
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static irqreturn_t keyscan_isr(int irq, void *dev_id) |
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{ |
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struct st_keyscan *keypad = dev_id; |
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unsigned short *keycode = keypad->input_dev->keycode; |
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unsigned long state, change; |
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int bit_nr; |
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state = readl(keypad->base + KEYSCAN_MATRIX_STATE_OFF) & 0xffff; |
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change = keypad->last_state ^ state; |
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keypad->last_state = state; |
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for_each_set_bit(bit_nr, &change, BITS_PER_LONG) |
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input_report_key(keypad->input_dev, |
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keycode[bit_nr], state & BIT(bit_nr)); |
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input_sync(keypad->input_dev); |
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return IRQ_HANDLED; |
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} |
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static int keyscan_start(struct st_keyscan *keypad) |
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{ |
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int error; |
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error = clk_enable(keypad->clk); |
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if (error) |
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return error; |
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writel(keypad->debounce_us * (clk_get_rate(keypad->clk) / 1000000), |
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keypad->base + KEYSCAN_DEBOUNCE_TIME_OFF); |
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writel(((keypad->n_cols - 1) << KEYSCAN_MATRIX_DIM_X_SHIFT) | |
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((keypad->n_rows - 1) << KEYSCAN_MATRIX_DIM_Y_SHIFT), |
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keypad->base + KEYSCAN_MATRIX_DIM_OFF); |
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writel(KEYSCAN_CONFIG_ENABLE, keypad->base + KEYSCAN_CONFIG_OFF); |
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return 0; |
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} |
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static void keyscan_stop(struct st_keyscan *keypad) |
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{ |
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writel(0, keypad->base + KEYSCAN_CONFIG_OFF); |
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clk_disable(keypad->clk); |
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} |
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static int keyscan_open(struct input_dev *dev) |
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{ |
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struct st_keyscan *keypad = input_get_drvdata(dev); |
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return keyscan_start(keypad); |
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} |
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static void keyscan_close(struct input_dev *dev) |
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{ |
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struct st_keyscan *keypad = input_get_drvdata(dev); |
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keyscan_stop(keypad); |
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} |
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static int keypad_matrix_key_parse_dt(struct st_keyscan *keypad_data) |
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{ |
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struct device *dev = keypad_data->input_dev->dev.parent; |
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struct device_node *np = dev->of_node; |
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int error; |
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error = matrix_keypad_parse_properties(dev, &keypad_data->n_rows, |
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&keypad_data->n_cols); |
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if (error) { |
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dev_err(dev, "failed to parse keypad params\n"); |
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return error; |
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} |
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of_property_read_u32(np, "st,debounce-us", &keypad_data->debounce_us); |
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dev_dbg(dev, "n_rows=%d n_col=%d debounce=%d\n", |
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keypad_data->n_rows, keypad_data->n_cols, |
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keypad_data->debounce_us); |
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return 0; |
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} |
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static int keyscan_probe(struct platform_device *pdev) |
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{ |
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struct st_keyscan *keypad_data; |
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struct input_dev *input_dev; |
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struct resource *res; |
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int error; |
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if (!pdev->dev.of_node) { |
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dev_err(&pdev->dev, "no DT data present\n"); |
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return -EINVAL; |
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} |
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keypad_data = devm_kzalloc(&pdev->dev, sizeof(*keypad_data), |
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GFP_KERNEL); |
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if (!keypad_data) |
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return -ENOMEM; |
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input_dev = devm_input_allocate_device(&pdev->dev); |
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if (!input_dev) { |
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dev_err(&pdev->dev, "failed to allocate the input device\n"); |
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return -ENOMEM; |
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} |
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input_dev->name = pdev->name; |
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input_dev->phys = "keyscan-keys/input0"; |
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input_dev->dev.parent = &pdev->dev; |
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input_dev->open = keyscan_open; |
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input_dev->close = keyscan_close; |
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input_dev->id.bustype = BUS_HOST; |
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keypad_data->input_dev = input_dev; |
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error = keypad_matrix_key_parse_dt(keypad_data); |
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if (error) |
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return error; |
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error = matrix_keypad_build_keymap(NULL, NULL, |
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keypad_data->n_rows, |
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keypad_data->n_cols, |
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NULL, 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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return error; |
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} |
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input_set_drvdata(input_dev, keypad_data); |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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keypad_data->base = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(keypad_data->base)) |
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return PTR_ERR(keypad_data->base); |
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keypad_data->clk = devm_clk_get(&pdev->dev, NULL); |
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if (IS_ERR(keypad_data->clk)) { |
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dev_err(&pdev->dev, "cannot get clock\n"); |
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return PTR_ERR(keypad_data->clk); |
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} |
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error = clk_enable(keypad_data->clk); |
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if (error) { |
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dev_err(&pdev->dev, "failed to enable clock\n"); |
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return error; |
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} |
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keyscan_stop(keypad_data); |
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keypad_data->irq = platform_get_irq(pdev, 0); |
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if (keypad_data->irq < 0) |
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return -EINVAL; |
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error = devm_request_irq(&pdev->dev, keypad_data->irq, keyscan_isr, 0, |
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pdev->name, keypad_data); |
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if (error) { |
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dev_err(&pdev->dev, "failed to request IRQ\n"); |
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return error; |
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} |
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error = input_register_device(input_dev); |
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if (error) { |
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dev_err(&pdev->dev, "failed to register input device\n"); |
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return error; |
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} |
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platform_set_drvdata(pdev, keypad_data); |
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device_set_wakeup_capable(&pdev->dev, 1); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int keyscan_suspend(struct device *dev) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct st_keyscan *keypad = platform_get_drvdata(pdev); |
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struct input_dev *input = keypad->input_dev; |
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mutex_lock(&input->mutex); |
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if (device_may_wakeup(dev)) |
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enable_irq_wake(keypad->irq); |
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else if (input_device_enabled(input)) |
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keyscan_stop(keypad); |
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mutex_unlock(&input->mutex); |
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return 0; |
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} |
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static int keyscan_resume(struct device *dev) |
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{ |
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struct platform_device *pdev = to_platform_device(dev); |
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struct st_keyscan *keypad = platform_get_drvdata(pdev); |
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struct input_dev *input = keypad->input_dev; |
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int retval = 0; |
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mutex_lock(&input->mutex); |
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if (device_may_wakeup(dev)) |
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disable_irq_wake(keypad->irq); |
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else if (input_device_enabled(input)) |
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retval = keyscan_start(keypad); |
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mutex_unlock(&input->mutex); |
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return retval; |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(keyscan_dev_pm_ops, keyscan_suspend, keyscan_resume); |
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static const struct of_device_id keyscan_of_match[] = { |
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{ .compatible = "st,sti-keyscan" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, keyscan_of_match); |
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static struct platform_driver keyscan_device_driver = { |
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.probe = keyscan_probe, |
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.driver = { |
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.name = "st-keyscan", |
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.pm = &keyscan_dev_pm_ops, |
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.of_match_table = of_match_ptr(keyscan_of_match), |
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} |
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}; |
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module_platform_driver(keyscan_device_driver); |
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MODULE_AUTHOR("Stuart Menefy <[email protected]>"); |
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MODULE_DESCRIPTION("STMicroelectronics keyscan device driver"); |
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MODULE_LICENSE("GPL");
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