345 строки
7.7 KiB
C
345 строки
7.7 KiB
C
/*
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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<rajeev-dlh.kumar@st.com>
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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/init.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/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 <plat/keyboard.h>
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/* Keyboard Registers */
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#define MODE_REG 0x00 /* 16 bit reg */
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#define STATUS_REG 0x0C /* 2 bit reg */
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#define DATA_REG 0x10 /* 8 bit reg */
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#define INTR_MASK 0x54
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/* Register Values */
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/*
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* pclk freq mask = (APB FEQ -1)= 82 MHZ.Programme bit 15-9 in mode
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* control register as 1010010(82MHZ)
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*/
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#define PCLK_FREQ_MSK 0xA400 /* 82 MHz */
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#define START_SCAN 0x0100
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#define SCAN_RATE_10 0x0000
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#define SCAN_RATE_20 0x0004
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#define SCAN_RATE_40 0x0008
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#define SCAN_RATE_80 0x000C
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#define MODE_KEYBOARD 0x0002
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#define DATA_AVAIL 0x2
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#define KEY_MASK 0xFF000000
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#define KEY_VALUE 0x00FFFFFF
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#define ROW_MASK 0xF0
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#define 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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struct resource *res;
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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 short last_key;
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unsigned short keycodes[256];
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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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u8 sts, val;
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sts = readb(kbd->io_base + STATUS_REG);
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if (!(sts & 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 = readb(kbd->io_base + DATA_REG);
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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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writeb(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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u16 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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/* program keyboard */
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val = SCAN_RATE_80 | MODE_KEYBOARD | PCLK_FREQ_MSK;
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writew(val, kbd->io_base + MODE_REG);
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writeb(1, kbd->io_base + STATUS_REG);
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/* start key scan */
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val = readw(kbd->io_base + MODE_REG);
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val |= START_SCAN;
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writew(val, kbd->io_base + MODE_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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u16 val;
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/* stop key scan */
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val = readw(kbd->io_base + MODE_REG);
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val &= ~START_SCAN;
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writew(val, kbd->io_base + MODE_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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static int __devinit spear_kbd_probe(struct platform_device *pdev)
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{
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const struct kbd_platform_data *pdata = pdev->dev.platform_data;
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const struct matrix_keymap_data *keymap;
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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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if (!pdata) {
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dev_err(&pdev->dev, "Invalid platform data\n");
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return -EINVAL;
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}
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keymap = pdata->keymap;
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if (!keymap) {
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dev_err(&pdev->dev, "no keymap defined\n");
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return -EINVAL;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "no keyboard resource defined\n");
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return -EBUSY;
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}
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "not able to get irq for the device\n");
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return irq;
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}
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kbd = kzalloc(sizeof(*kbd), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!kbd || !input_dev) {
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dev_err(&pdev->dev, "out of memory\n");
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error = -ENOMEM;
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goto err_free_mem;
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}
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kbd->input = input_dev;
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kbd->irq = irq;
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kbd->res = request_mem_region(res->start, resource_size(res),
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pdev->name);
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if (!kbd->res) {
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dev_err(&pdev->dev, "keyboard region already claimed\n");
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error = -EBUSY;
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goto err_free_mem;
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}
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kbd->io_base = ioremap(res->start, resource_size(res));
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if (!kbd->io_base) {
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dev_err(&pdev->dev, "ioremap failed for kbd_region\n");
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error = -ENOMEM;
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goto err_release_mem_region;
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}
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kbd->clk = clk_get(&pdev->dev, NULL);
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if (IS_ERR(kbd->clk)) {
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error = PTR_ERR(kbd->clk);
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goto err_iounmap;
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}
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input_dev->name = "Spear Keyboard";
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input_dev->phys = "keyboard/input0";
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input_dev->dev.parent = &pdev->dev;
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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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__set_bit(EV_KEY, input_dev->evbit);
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if (pdata->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_dev->keycode = kbd->keycodes;
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input_dev->keycodesize = sizeof(kbd->keycodes[0]);
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input_dev->keycodemax = ARRAY_SIZE(kbd->keycodes);
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matrix_keypad_build_keymap(keymap, ROW_SHIFT,
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input_dev->keycode, input_dev->keybit);
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input_set_drvdata(input_dev, kbd);
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error = request_irq(irq, spear_kbd_interrupt, 0, "keyboard", kbd);
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if (error) {
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dev_err(&pdev->dev, "request_irq fail\n");
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goto err_put_clk;
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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, "Unable to register keyboard device\n");
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goto err_free_irq;
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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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err_free_irq:
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free_irq(kbd->irq, kbd);
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err_put_clk:
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clk_put(kbd->clk);
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err_iounmap:
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iounmap(kbd->io_base);
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err_release_mem_region:
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release_mem_region(res->start, resource_size(res));
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err_free_mem:
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input_free_device(input_dev);
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kfree(kbd);
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return error;
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}
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static int __devexit 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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free_irq(kbd->irq, kbd);
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input_unregister_device(kbd->input);
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clk_put(kbd->clk);
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iounmap(kbd->io_base);
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release_mem_region(kbd->res->start, resource_size(kbd->res));
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kfree(kbd);
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device_init_wakeup(&pdev->dev, 1);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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#ifdef CONFIG_PM
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static int 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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mutex_lock(&input_dev->mutex);
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if (input_dev->users)
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clk_enable(kbd->clk);
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if (device_may_wakeup(&pdev->dev))
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enable_irq_wake(kbd->irq);
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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 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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disable_irq_wake(kbd->irq);
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if (input_dev->users)
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clk_enable(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 const struct dev_pm_ops spear_kbd_pm_ops = {
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.suspend = spear_kbd_suspend,
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.resume = spear_kbd_resume,
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};
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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 = __devexit_p(spear_kbd_remove),
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.driver = {
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.name = "keyboard",
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.owner = THIS_MODULE,
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#ifdef CONFIG_PM
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.pm = &spear_kbd_pm_ops,
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#endif
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},
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};
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static int __init spear_kbd_init(void)
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{
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return platform_driver_register(&spear_kbd_driver);
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}
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module_init(spear_kbd_init);
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static void __exit spear_kbd_exit(void)
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{
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platform_driver_unregister(&spear_kbd_driver);
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}
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module_exit(spear_kbd_exit);
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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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