423 lines
9.9 KiB
C
423 lines
9.9 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/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 <plat/keyboard.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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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 int mode;
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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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unsigned int suspended_rate;
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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 __devinit 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 __devinit 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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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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if (!pdata) {
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error = spear_kbd_parse_dt(pdev, kbd);
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if (error)
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goto err_free_mem;
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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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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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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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goto err_put_clk;
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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 = 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, 0);
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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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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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enable_irq_wake(kbd->irq);
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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_dev->users) {
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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_dev->users)
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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 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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} else {
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if (input_dev->users)
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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_dev->users)
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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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#endif
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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 = __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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.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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