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390 lines
9.3 KiB
390 lines
9.3 KiB
/* |
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* SPEAr Keyboard Driver |
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* Based on omap-keypad driver |
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* |
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* Copyright (C) 2010 ST Microelectronics |
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* Rajeev Kumar <[email protected]> |
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* |
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* This file is licensed under the terms of the GNU General Public |
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* License version 2. This program is licensed "as is" without any |
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* warranty of any kind, whether express or implied. |
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*/ |
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#include <linux/clk.h> |
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#include <linux/errno.h> |
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#include <linux/interrupt.h> |
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#include <linux/input.h> |
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#include <linux/io.h> |
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#include <linux/irq.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_wakeup.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#include <linux/platform_data/keyboard-spear.h> |
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/* Keyboard Registers */ |
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#define MODE_CTL_REG 0x00 |
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#define STATUS_REG 0x0C |
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#define DATA_REG 0x10 |
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#define INTR_MASK 0x54 |
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/* Register Values */ |
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#define NUM_ROWS 16 |
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#define NUM_COLS 16 |
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#define MODE_CTL_PCLK_FREQ_SHIFT 9 |
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#define MODE_CTL_PCLK_FREQ_MSK 0x7F |
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#define MODE_CTL_KEYBOARD (0x2 << 0) |
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#define MODE_CTL_SCAN_RATE_10 (0x0 << 2) |
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#define MODE_CTL_SCAN_RATE_20 (0x1 << 2) |
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#define MODE_CTL_SCAN_RATE_40 (0x2 << 2) |
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#define MODE_CTL_SCAN_RATE_80 (0x3 << 2) |
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#define MODE_CTL_KEYNUM_SHIFT 6 |
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#define MODE_CTL_START_SCAN (0x1 << 8) |
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#define STATUS_DATA_AVAIL (0x1 << 1) |
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#define DATA_ROW_MASK 0xF0 |
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#define DATA_COLUMN_MASK 0x0F |
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#define ROW_SHIFT 4 |
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struct spear_kbd { |
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struct input_dev *input; |
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void __iomem *io_base; |
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struct clk *clk; |
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unsigned int irq; |
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unsigned int mode; |
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unsigned int suspended_rate; |
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unsigned short last_key; |
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unsigned short keycodes[NUM_ROWS * NUM_COLS]; |
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bool rep; |
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bool irq_wake_enabled; |
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u32 mode_ctl_reg; |
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}; |
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static irqreturn_t spear_kbd_interrupt(int irq, void *dev_id) |
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{ |
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struct spear_kbd *kbd = dev_id; |
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struct input_dev *input = kbd->input; |
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unsigned int key; |
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u32 sts, val; |
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sts = readl_relaxed(kbd->io_base + STATUS_REG); |
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if (!(sts & STATUS_DATA_AVAIL)) |
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return IRQ_NONE; |
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if (kbd->last_key != KEY_RESERVED) { |
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input_report_key(input, kbd->last_key, 0); |
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kbd->last_key = KEY_RESERVED; |
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} |
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/* following reads active (row, col) pair */ |
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val = readl_relaxed(kbd->io_base + DATA_REG) & |
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(DATA_ROW_MASK | DATA_COLUMN_MASK); |
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key = kbd->keycodes[val]; |
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input_event(input, EV_MSC, MSC_SCAN, val); |
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input_report_key(input, key, 1); |
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input_sync(input); |
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kbd->last_key = key; |
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/* clear interrupt */ |
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writel_relaxed(0, kbd->io_base + STATUS_REG); |
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return IRQ_HANDLED; |
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} |
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static int spear_kbd_open(struct input_dev *dev) |
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{ |
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struct spear_kbd *kbd = input_get_drvdata(dev); |
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int error; |
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u32 val; |
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kbd->last_key = KEY_RESERVED; |
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error = clk_enable(kbd->clk); |
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if (error) |
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return error; |
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/* keyboard rate to be programmed is input clock (in MHz) - 1 */ |
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val = clk_get_rate(kbd->clk) / 1000000 - 1; |
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val = (val & MODE_CTL_PCLK_FREQ_MSK) << MODE_CTL_PCLK_FREQ_SHIFT; |
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/* program keyboard */ |
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val = MODE_CTL_SCAN_RATE_80 | MODE_CTL_KEYBOARD | val | |
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(kbd->mode << MODE_CTL_KEYNUM_SHIFT); |
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writel_relaxed(val, kbd->io_base + MODE_CTL_REG); |
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writel_relaxed(1, kbd->io_base + STATUS_REG); |
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/* start key scan */ |
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val = readl_relaxed(kbd->io_base + MODE_CTL_REG); |
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val |= MODE_CTL_START_SCAN; |
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writel_relaxed(val, kbd->io_base + MODE_CTL_REG); |
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return 0; |
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} |
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static void spear_kbd_close(struct input_dev *dev) |
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{ |
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struct spear_kbd *kbd = input_get_drvdata(dev); |
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u32 val; |
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/* stop key scan */ |
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val = readl_relaxed(kbd->io_base + MODE_CTL_REG); |
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val &= ~MODE_CTL_START_SCAN; |
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writel_relaxed(val, kbd->io_base + MODE_CTL_REG); |
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clk_disable(kbd->clk); |
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kbd->last_key = KEY_RESERVED; |
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} |
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#ifdef CONFIG_OF |
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static int spear_kbd_parse_dt(struct platform_device *pdev, |
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struct spear_kbd *kbd) |
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{ |
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struct device_node *np = pdev->dev.of_node; |
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int error; |
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u32 val, suspended_rate; |
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if (!np) { |
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dev_err(&pdev->dev, "Missing DT data\n"); |
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return -EINVAL; |
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} |
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if (of_property_read_bool(np, "autorepeat")) |
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kbd->rep = true; |
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if (of_property_read_u32(np, "suspended_rate", &suspended_rate)) |
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kbd->suspended_rate = suspended_rate; |
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error = of_property_read_u32(np, "st,mode", &val); |
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if (error) { |
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dev_err(&pdev->dev, "DT: Invalid or missing mode\n"); |
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return error; |
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} |
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kbd->mode = val; |
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return 0; |
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} |
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#else |
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static inline int spear_kbd_parse_dt(struct platform_device *pdev, |
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struct spear_kbd *kbd) |
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{ |
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return -ENOSYS; |
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} |
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#endif |
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static int spear_kbd_probe(struct platform_device *pdev) |
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{ |
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struct kbd_platform_data *pdata = dev_get_platdata(&pdev->dev); |
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const struct matrix_keymap_data *keymap = pdata ? pdata->keymap : NULL; |
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struct spear_kbd *kbd; |
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struct input_dev *input_dev; |
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struct resource *res; |
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int irq; |
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int error; |
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irq = platform_get_irq(pdev, 0); |
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if (irq < 0) |
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return irq; |
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kbd = devm_kzalloc(&pdev->dev, sizeof(*kbd), GFP_KERNEL); |
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if (!kbd) { |
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dev_err(&pdev->dev, "not enough memory for driver data\n"); |
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return -ENOMEM; |
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} |
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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, "unable to allocate input device\n"); |
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return -ENOMEM; |
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} |
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kbd->input = input_dev; |
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kbd->irq = irq; |
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if (!pdata) { |
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error = spear_kbd_parse_dt(pdev, kbd); |
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if (error) |
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return error; |
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} else { |
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kbd->mode = pdata->mode; |
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kbd->rep = pdata->rep; |
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kbd->suspended_rate = pdata->suspended_rate; |
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} |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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kbd->io_base = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(kbd->io_base)) |
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return PTR_ERR(kbd->io_base); |
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kbd->clk = devm_clk_get(&pdev->dev, NULL); |
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if (IS_ERR(kbd->clk)) |
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return PTR_ERR(kbd->clk); |
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input_dev->name = "Spear Keyboard"; |
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input_dev->phys = "keyboard/input0"; |
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input_dev->id.bustype = BUS_HOST; |
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input_dev->id.vendor = 0x0001; |
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input_dev->id.product = 0x0001; |
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input_dev->id.version = 0x0100; |
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input_dev->open = spear_kbd_open; |
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input_dev->close = spear_kbd_close; |
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error = matrix_keypad_build_keymap(keymap, NULL, NUM_ROWS, NUM_COLS, |
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kbd->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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return error; |
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} |
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if (kbd->rep) |
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__set_bit(EV_REP, input_dev->evbit); |
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input_set_capability(input_dev, EV_MSC, MSC_SCAN); |
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input_set_drvdata(input_dev, kbd); |
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error = devm_request_irq(&pdev->dev, irq, spear_kbd_interrupt, 0, |
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"keyboard", kbd); |
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if (error) { |
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dev_err(&pdev->dev, "request_irq failed\n"); |
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return error; |
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} |
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error = clk_prepare(kbd->clk); |
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if (error) |
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return error; |
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error = input_register_device(input_dev); |
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if (error) { |
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dev_err(&pdev->dev, "Unable to register keyboard device\n"); |
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clk_unprepare(kbd->clk); |
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return error; |
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} |
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device_init_wakeup(&pdev->dev, 1); |
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platform_set_drvdata(pdev, kbd); |
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return 0; |
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} |
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static int spear_kbd_remove(struct platform_device *pdev) |
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{ |
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struct spear_kbd *kbd = platform_get_drvdata(pdev); |
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input_unregister_device(kbd->input); |
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clk_unprepare(kbd->clk); |
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return 0; |
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} |
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static int __maybe_unused spear_kbd_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 spear_kbd *kbd = platform_get_drvdata(pdev); |
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struct input_dev *input_dev = kbd->input; |
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unsigned int rate = 0, mode_ctl_reg, val; |
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mutex_lock(&input_dev->mutex); |
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/* explicitly enable clock as we may program device */ |
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clk_enable(kbd->clk); |
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mode_ctl_reg = readl_relaxed(kbd->io_base + MODE_CTL_REG); |
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if (device_may_wakeup(&pdev->dev)) { |
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if (!enable_irq_wake(kbd->irq)) |
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kbd->irq_wake_enabled = true; |
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/* |
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* reprogram the keyboard operating frequency as on some |
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* platform it may change during system suspended |
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*/ |
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if (kbd->suspended_rate) |
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rate = kbd->suspended_rate / 1000000 - 1; |
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else |
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rate = clk_get_rate(kbd->clk) / 1000000 - 1; |
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val = mode_ctl_reg & |
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~(MODE_CTL_PCLK_FREQ_MSK << MODE_CTL_PCLK_FREQ_SHIFT); |
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val |= (rate & MODE_CTL_PCLK_FREQ_MSK) |
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<< MODE_CTL_PCLK_FREQ_SHIFT; |
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writel_relaxed(val, kbd->io_base + MODE_CTL_REG); |
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} else { |
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if (input_device_enabled(input_dev)) { |
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writel_relaxed(mode_ctl_reg & ~MODE_CTL_START_SCAN, |
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kbd->io_base + MODE_CTL_REG); |
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clk_disable(kbd->clk); |
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} |
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} |
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/* store current configuration */ |
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if (input_device_enabled(input_dev)) |
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kbd->mode_ctl_reg = mode_ctl_reg; |
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/* restore previous clk state */ |
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clk_disable(kbd->clk); |
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mutex_unlock(&input_dev->mutex); |
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return 0; |
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} |
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static int __maybe_unused spear_kbd_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 spear_kbd *kbd = platform_get_drvdata(pdev); |
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struct input_dev *input_dev = kbd->input; |
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mutex_lock(&input_dev->mutex); |
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if (device_may_wakeup(&pdev->dev)) { |
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if (kbd->irq_wake_enabled) { |
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kbd->irq_wake_enabled = false; |
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disable_irq_wake(kbd->irq); |
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} |
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} else { |
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if (input_device_enabled(input_dev)) |
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clk_enable(kbd->clk); |
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} |
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/* restore current configuration */ |
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if (input_device_enabled(input_dev)) |
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writel_relaxed(kbd->mode_ctl_reg, kbd->io_base + MODE_CTL_REG); |
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mutex_unlock(&input_dev->mutex); |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(spear_kbd_pm_ops, spear_kbd_suspend, spear_kbd_resume); |
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#ifdef CONFIG_OF |
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static const struct of_device_id spear_kbd_id_table[] = { |
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{ .compatible = "st,spear300-kbd" }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, spear_kbd_id_table); |
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#endif |
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static struct platform_driver spear_kbd_driver = { |
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.probe = spear_kbd_probe, |
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.remove = spear_kbd_remove, |
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.driver = { |
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.name = "keyboard", |
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.pm = &spear_kbd_pm_ops, |
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.of_match_table = of_match_ptr(spear_kbd_id_table), |
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}, |
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}; |
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module_platform_driver(spear_kbd_driver); |
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MODULE_AUTHOR("Rajeev Kumar"); |
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MODULE_DESCRIPTION("SPEAr Keyboard Driver"); |
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MODULE_LICENSE("GPL");
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