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e2619cf78e
CONFIG_HOTPLUG is going away as an option so __devexit is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
332 lines
8.0 KiB
C
332 lines
8.0 KiB
C
/*
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* Texas Instruments TNETV107X Keypad Driver
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*
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* Copyright (C) 2010 Texas Instruments
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/input.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/clk.h>
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#include <linux/input/matrix_keypad.h>
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#include <linux/module.h>
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#define BITS(x) (BIT(x) - 1)
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#define KEYPAD_ROWS 9
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#define KEYPAD_COLS 9
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#define DEBOUNCE_MIN 0x400ul
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#define DEBOUNCE_MAX 0x3ffffffful
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struct keypad_regs {
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u32 rev;
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u32 mode;
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u32 mask;
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u32 pol;
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u32 dclock;
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u32 rclock;
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u32 stable_cnt;
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u32 in_en;
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u32 out;
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u32 out_en;
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u32 in;
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u32 lock;
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u32 pres[3];
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};
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#define keypad_read(kp, reg) __raw_readl(&(kp)->regs->reg)
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#define keypad_write(kp, reg, val) __raw_writel(val, &(kp)->regs->reg)
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struct keypad_data {
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struct input_dev *input_dev;
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struct resource *res;
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struct keypad_regs __iomem *regs;
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struct clk *clk;
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struct device *dev;
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spinlock_t lock;
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u32 irq_press;
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u32 irq_release;
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int rows, cols, row_shift;
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int debounce_ms, active_low;
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u32 prev_keys[3];
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unsigned short keycodes[];
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};
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static irqreturn_t keypad_irq(int irq, void *data)
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{
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struct keypad_data *kp = data;
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int i, bit, val, row, col, code;
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unsigned long flags;
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u32 curr_keys[3];
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u32 change;
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spin_lock_irqsave(&kp->lock, flags);
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memset(curr_keys, 0, sizeof(curr_keys));
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if (irq == kp->irq_press)
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for (i = 0; i < 3; i++)
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curr_keys[i] = keypad_read(kp, pres[i]);
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for (i = 0; i < 3; i++) {
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change = curr_keys[i] ^ kp->prev_keys[i];
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while (change) {
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bit = fls(change) - 1;
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change ^= BIT(bit);
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val = curr_keys[i] & BIT(bit);
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bit += i * 32;
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row = bit / KEYPAD_COLS;
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col = bit % KEYPAD_COLS;
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code = MATRIX_SCAN_CODE(row, col, kp->row_shift);
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input_event(kp->input_dev, EV_MSC, MSC_SCAN, code);
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input_report_key(kp->input_dev, kp->keycodes[code],
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val);
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}
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}
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input_sync(kp->input_dev);
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memcpy(kp->prev_keys, curr_keys, sizeof(curr_keys));
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if (irq == kp->irq_press)
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keypad_write(kp, lock, 0); /* Allow hardware updates */
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spin_unlock_irqrestore(&kp->lock, flags);
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return IRQ_HANDLED;
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}
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static int keypad_start(struct input_dev *dev)
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{
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struct keypad_data *kp = input_get_drvdata(dev);
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unsigned long mask, debounce, clk_rate_khz;
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unsigned long flags;
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clk_enable(kp->clk);
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clk_rate_khz = clk_get_rate(kp->clk) / 1000;
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spin_lock_irqsave(&kp->lock, flags);
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/* Initialize device registers */
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keypad_write(kp, mode, 0);
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mask = BITS(kp->rows) << KEYPAD_COLS;
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mask |= BITS(kp->cols);
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keypad_write(kp, mask, ~mask);
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keypad_write(kp, pol, kp->active_low ? 0 : 0x3ffff);
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keypad_write(kp, stable_cnt, 3);
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debounce = kp->debounce_ms * clk_rate_khz;
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debounce = clamp(debounce, DEBOUNCE_MIN, DEBOUNCE_MAX);
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keypad_write(kp, dclock, debounce);
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keypad_write(kp, rclock, 4 * debounce);
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keypad_write(kp, in_en, 1);
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spin_unlock_irqrestore(&kp->lock, flags);
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return 0;
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}
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static void keypad_stop(struct input_dev *dev)
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{
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struct keypad_data *kp = input_get_drvdata(dev);
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synchronize_irq(kp->irq_press);
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synchronize_irq(kp->irq_release);
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clk_disable(kp->clk);
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}
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static int keypad_probe(struct platform_device *pdev)
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{
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const struct matrix_keypad_platform_data *pdata;
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const struct matrix_keymap_data *keymap_data;
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struct device *dev = &pdev->dev;
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struct keypad_data *kp;
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int error = 0, sz, row_shift;
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u32 rev = 0;
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(dev, "cannot find device data\n");
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return -EINVAL;
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}
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keymap_data = pdata->keymap_data;
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if (!keymap_data) {
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dev_err(dev, "cannot find keymap data\n");
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return -EINVAL;
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}
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row_shift = get_count_order(pdata->num_col_gpios);
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sz = offsetof(struct keypad_data, keycodes);
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sz += (pdata->num_row_gpios << row_shift) * sizeof(kp->keycodes[0]);
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kp = kzalloc(sz, GFP_KERNEL);
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if (!kp) {
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dev_err(dev, "cannot allocate device info\n");
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return -ENOMEM;
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}
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kp->dev = dev;
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kp->rows = pdata->num_row_gpios;
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kp->cols = pdata->num_col_gpios;
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kp->row_shift = row_shift;
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platform_set_drvdata(pdev, kp);
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spin_lock_init(&kp->lock);
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kp->irq_press = platform_get_irq_byname(pdev, "press");
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kp->irq_release = platform_get_irq_byname(pdev, "release");
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if (kp->irq_press < 0 || kp->irq_release < 0) {
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dev_err(dev, "cannot determine device interrupts\n");
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error = -ENODEV;
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goto error_res;
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}
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kp->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!kp->res) {
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dev_err(dev, "cannot determine register area\n");
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error = -ENODEV;
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goto error_res;
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}
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if (!request_mem_region(kp->res->start, resource_size(kp->res),
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pdev->name)) {
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dev_err(dev, "cannot claim register memory\n");
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kp->res = NULL;
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error = -EINVAL;
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goto error_res;
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}
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kp->regs = ioremap(kp->res->start, resource_size(kp->res));
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if (!kp->regs) {
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dev_err(dev, "cannot map register memory\n");
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error = -ENOMEM;
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goto error_map;
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}
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kp->clk = clk_get(dev, NULL);
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if (IS_ERR(kp->clk)) {
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dev_err(dev, "cannot claim device clock\n");
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error = PTR_ERR(kp->clk);
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goto error_clk;
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}
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error = request_threaded_irq(kp->irq_press, NULL, keypad_irq,
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IRQF_ONESHOT, dev_name(dev), kp);
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if (error < 0) {
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dev_err(kp->dev, "Could not allocate keypad press key irq\n");
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goto error_irq_press;
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}
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error = request_threaded_irq(kp->irq_release, NULL, keypad_irq,
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IRQF_ONESHOT, dev_name(dev), kp);
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if (error < 0) {
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dev_err(kp->dev, "Could not allocate keypad release key irq\n");
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goto error_irq_release;
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}
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kp->input_dev = input_allocate_device();
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if (!kp->input_dev) {
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dev_err(dev, "cannot allocate input device\n");
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error = -ENOMEM;
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goto error_input;
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}
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kp->input_dev->name = pdev->name;
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kp->input_dev->dev.parent = &pdev->dev;
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kp->input_dev->open = keypad_start;
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kp->input_dev->close = keypad_stop;
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clk_enable(kp->clk);
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rev = keypad_read(kp, rev);
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kp->input_dev->id.bustype = BUS_HOST;
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kp->input_dev->id.product = ((rev >> 8) & 0x07);
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kp->input_dev->id.version = ((rev >> 16) & 0xfff);
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clk_disable(kp->clk);
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error = matrix_keypad_build_keymap(keymap_data, NULL,
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kp->rows, kp->cols,
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kp->keycodes, kp->input_dev);
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if (error) {
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dev_err(dev, "Failed to build keymap\n");
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goto error_reg;
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}
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if (!pdata->no_autorepeat)
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kp->input_dev->evbit[0] |= BIT_MASK(EV_REP);
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input_set_capability(kp->input_dev, EV_MSC, MSC_SCAN);
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input_set_drvdata(kp->input_dev, kp);
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error = input_register_device(kp->input_dev);
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if (error < 0) {
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dev_err(dev, "Could not register input device\n");
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goto error_reg;
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}
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return 0;
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error_reg:
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input_free_device(kp->input_dev);
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error_input:
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free_irq(kp->irq_release, kp);
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error_irq_release:
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free_irq(kp->irq_press, kp);
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error_irq_press:
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clk_put(kp->clk);
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error_clk:
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iounmap(kp->regs);
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error_map:
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release_mem_region(kp->res->start, resource_size(kp->res));
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error_res:
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platform_set_drvdata(pdev, NULL);
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kfree(kp);
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return error;
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}
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static int keypad_remove(struct platform_device *pdev)
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{
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struct keypad_data *kp = platform_get_drvdata(pdev);
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free_irq(kp->irq_press, kp);
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free_irq(kp->irq_release, kp);
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input_unregister_device(kp->input_dev);
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clk_put(kp->clk);
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iounmap(kp->regs);
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release_mem_region(kp->res->start, resource_size(kp->res));
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platform_set_drvdata(pdev, NULL);
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kfree(kp);
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return 0;
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}
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static struct platform_driver keypad_driver = {
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.probe = keypad_probe,
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.remove = keypad_remove,
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.driver.name = "tnetv107x-keypad",
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.driver.owner = THIS_MODULE,
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};
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module_platform_driver(keypad_driver);
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MODULE_AUTHOR("Cyril Chemparathy");
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MODULE_DESCRIPTION("TNETV107X Keypad Driver");
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MODULE_ALIAS("platform:tnetv107x-keypad");
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MODULE_LICENSE("GPL");
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