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503 lines
13 KiB
503 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* OMAP4 Keypad Driver |
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* |
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* Copyright (C) 2010 Texas Instruments |
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* |
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* Author: Abraham Arce <[email protected]> |
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* Initial Code: Syed Rafiuddin <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/interrupt.h> |
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#include <linux/platform_device.h> |
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#include <linux/errno.h> |
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#include <linux/io.h> |
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#include <linux/of.h> |
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#include <linux/input.h> |
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#include <linux/input/matrix_keypad.h> |
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#include <linux/slab.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/pm_wakeirq.h> |
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/* OMAP4 registers */ |
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#define OMAP4_KBD_REVISION 0x00 |
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#define OMAP4_KBD_SYSCONFIG 0x10 |
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#define OMAP4_KBD_SYSSTATUS 0x14 |
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#define OMAP4_KBD_IRQSTATUS 0x18 |
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#define OMAP4_KBD_IRQENABLE 0x1C |
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#define OMAP4_KBD_WAKEUPENABLE 0x20 |
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#define OMAP4_KBD_PENDING 0x24 |
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#define OMAP4_KBD_CTRL 0x28 |
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#define OMAP4_KBD_DEBOUNCINGTIME 0x2C |
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#define OMAP4_KBD_LONGKEYTIME 0x30 |
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#define OMAP4_KBD_TIMEOUT 0x34 |
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#define OMAP4_KBD_STATEMACHINE 0x38 |
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#define OMAP4_KBD_ROWINPUTS 0x3C |
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#define OMAP4_KBD_COLUMNOUTPUTS 0x40 |
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#define OMAP4_KBD_FULLCODE31_0 0x44 |
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#define OMAP4_KBD_FULLCODE63_32 0x48 |
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/* OMAP4 bit definitions */ |
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#define OMAP4_DEF_IRQENABLE_EVENTEN BIT(0) |
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#define OMAP4_DEF_IRQENABLE_LONGKEY BIT(1) |
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#define OMAP4_DEF_WUP_EVENT_ENA BIT(0) |
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#define OMAP4_DEF_WUP_LONG_KEY_ENA BIT(1) |
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#define OMAP4_DEF_CTRL_NOSOFTMODE BIT(1) |
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#define OMAP4_DEF_CTRL_PTV_SHIFT 2 |
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/* OMAP4 values */ |
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#define OMAP4_VAL_IRQDISABLE 0x0 |
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/* |
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* Errata i689: If a key is released for a time shorter than debounce time, |
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* the keyboard will idle and never detect the key release. The workaround |
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* is to use at least a 12ms debounce time. See omap5432 TRM chapter |
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* "26.4.6.2 Keyboard Controller Timer" for more information. |
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*/ |
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#define OMAP4_KEYPAD_PTV_DIV_128 0x6 |
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#define OMAP4_KEYPAD_DEBOUNCINGTIME_MS(dbms, ptv) \ |
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((((dbms) * 1000) / ((1 << ((ptv) + 1)) * (1000000 / 32768))) - 1) |
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#define OMAP4_VAL_DEBOUNCINGTIME_16MS \ |
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OMAP4_KEYPAD_DEBOUNCINGTIME_MS(16, OMAP4_KEYPAD_PTV_DIV_128) |
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#define OMAP4_KEYPAD_AUTOIDLE_MS 50 /* Approximate measured time */ |
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#define OMAP4_KEYPAD_IDLE_CHECK_MS (OMAP4_KEYPAD_AUTOIDLE_MS / 2) |
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enum { |
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KBD_REVISION_OMAP4 = 0, |
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KBD_REVISION_OMAP5, |
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}; |
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struct omap4_keypad { |
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struct input_dev *input; |
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void __iomem *base; |
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unsigned int irq; |
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struct mutex lock; /* for key scan */ |
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unsigned int rows; |
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unsigned int cols; |
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u32 reg_offset; |
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u32 irqreg_offset; |
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unsigned int row_shift; |
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bool no_autorepeat; |
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u64 keys; |
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unsigned short *keymap; |
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}; |
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static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset) |
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{ |
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return __raw_readl(keypad_data->base + |
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keypad_data->reg_offset + offset); |
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} |
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static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value) |
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{ |
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__raw_writel(value, |
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keypad_data->base + keypad_data->reg_offset + offset); |
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} |
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static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset) |
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{ |
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return __raw_readl(keypad_data->base + |
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keypad_data->irqreg_offset + offset); |
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} |
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static void kbd_write_irqreg(struct omap4_keypad *keypad_data, |
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u32 offset, u32 value) |
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{ |
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__raw_writel(value, |
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keypad_data->base + keypad_data->irqreg_offset + offset); |
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} |
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static int omap4_keypad_report_keys(struct omap4_keypad *keypad_data, |
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u64 keys, bool down) |
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{ |
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struct input_dev *input_dev = keypad_data->input; |
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unsigned int col, row, code; |
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DECLARE_BITMAP(mask, 64); |
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unsigned long bit; |
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int events = 0; |
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bitmap_from_u64(mask, keys); |
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for_each_set_bit(bit, mask, keypad_data->rows * BITS_PER_BYTE) { |
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row = bit / BITS_PER_BYTE; |
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col = bit % BITS_PER_BYTE; |
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code = MATRIX_SCAN_CODE(row, col, keypad_data->row_shift); |
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input_event(input_dev, EV_MSC, MSC_SCAN, code); |
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input_report_key(input_dev, keypad_data->keymap[code], down); |
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events++; |
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} |
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if (events) |
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input_sync(input_dev); |
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return events; |
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} |
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static void omap4_keypad_scan_keys(struct omap4_keypad *keypad_data, u64 keys) |
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{ |
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u64 changed; |
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mutex_lock(&keypad_data->lock); |
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changed = keys ^ keypad_data->keys; |
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/* |
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* Report key up events separately and first. This matters in case we |
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* lost key-up interrupt and just now catching up. |
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*/ |
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omap4_keypad_report_keys(keypad_data, changed & ~keys, false); |
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/* Report key down events */ |
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omap4_keypad_report_keys(keypad_data, changed & keys, true); |
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keypad_data->keys = keys; |
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mutex_unlock(&keypad_data->lock); |
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} |
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/* Interrupt handlers */ |
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static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id) |
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{ |
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struct omap4_keypad *keypad_data = dev_id; |
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if (kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS)) |
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return IRQ_WAKE_THREAD; |
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return IRQ_NONE; |
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} |
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static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id) |
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{ |
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struct omap4_keypad *keypad_data = dev_id; |
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struct device *dev = keypad_data->input->dev.parent; |
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u32 low, high; |
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int error; |
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u64 keys; |
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error = pm_runtime_get_sync(dev); |
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if (error < 0) { |
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pm_runtime_put_noidle(dev); |
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return IRQ_NONE; |
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} |
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low = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0); |
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high = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32); |
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keys = low | (u64)high << 32; |
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omap4_keypad_scan_keys(keypad_data, keys); |
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/* clear pending interrupts */ |
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kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS, |
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kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS)); |
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pm_runtime_mark_last_busy(dev); |
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pm_runtime_put_autosuspend(dev); |
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return IRQ_HANDLED; |
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} |
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static int omap4_keypad_open(struct input_dev *input) |
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{ |
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struct omap4_keypad *keypad_data = input_get_drvdata(input); |
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struct device *dev = input->dev.parent; |
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int error; |
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error = pm_runtime_get_sync(dev); |
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if (error < 0) { |
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pm_runtime_put_noidle(dev); |
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return error; |
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} |
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disable_irq(keypad_data->irq); |
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kbd_writel(keypad_data, OMAP4_KBD_CTRL, |
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OMAP4_DEF_CTRL_NOSOFTMODE | |
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(OMAP4_KEYPAD_PTV_DIV_128 << OMAP4_DEF_CTRL_PTV_SHIFT)); |
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kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME, |
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OMAP4_VAL_DEBOUNCINGTIME_16MS); |
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/* clear pending interrupts */ |
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kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS, |
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kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS)); |
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kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE, |
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OMAP4_DEF_IRQENABLE_EVENTEN); |
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kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE, |
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OMAP4_DEF_WUP_EVENT_ENA); |
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enable_irq(keypad_data->irq); |
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pm_runtime_mark_last_busy(dev); |
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pm_runtime_put_autosuspend(dev); |
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return 0; |
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} |
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static void omap4_keypad_stop(struct omap4_keypad *keypad_data) |
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{ |
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/* Disable interrupts and wake-up events */ |
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kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE, |
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OMAP4_VAL_IRQDISABLE); |
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kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE, 0); |
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/* clear pending interrupts */ |
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kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS, |
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kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS)); |
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} |
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static void omap4_keypad_close(struct input_dev *input) |
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{ |
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struct omap4_keypad *keypad_data = input_get_drvdata(input); |
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struct device *dev = input->dev.parent; |
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int error; |
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error = pm_runtime_get_sync(dev); |
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if (error < 0) |
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pm_runtime_put_noidle(dev); |
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disable_irq(keypad_data->irq); |
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omap4_keypad_stop(keypad_data); |
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enable_irq(keypad_data->irq); |
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pm_runtime_mark_last_busy(dev); |
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pm_runtime_put_autosuspend(dev); |
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} |
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static int omap4_keypad_parse_dt(struct device *dev, |
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struct omap4_keypad *keypad_data) |
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{ |
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struct device_node *np = dev->of_node; |
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int err; |
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err = matrix_keypad_parse_properties(dev, &keypad_data->rows, |
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&keypad_data->cols); |
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if (err) |
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return err; |
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if (of_get_property(np, "linux,input-no-autorepeat", NULL)) |
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keypad_data->no_autorepeat = true; |
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return 0; |
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} |
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static int omap4_keypad_check_revision(struct device *dev, |
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struct omap4_keypad *keypad_data) |
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{ |
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unsigned int rev; |
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rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION); |
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rev &= 0x03 << 30; |
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rev >>= 30; |
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switch (rev) { |
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case KBD_REVISION_OMAP4: |
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keypad_data->reg_offset = 0x00; |
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keypad_data->irqreg_offset = 0x00; |
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break; |
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case KBD_REVISION_OMAP5: |
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keypad_data->reg_offset = 0x10; |
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keypad_data->irqreg_offset = 0x0c; |
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break; |
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default: |
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dev_err(dev, "Keypad reports unsupported revision %d", rev); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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/* |
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* Errata ID i689 "1.32 Keyboard Key Up Event Can Be Missed". |
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* Interrupt may not happen for key-up events. We must clear stuck |
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* key-up events after the keyboard hardware has auto-idled. |
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*/ |
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static int __maybe_unused omap4_keypad_runtime_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 omap4_keypad *keypad_data = platform_get_drvdata(pdev); |
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u32 active; |
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active = kbd_readl(keypad_data, OMAP4_KBD_STATEMACHINE); |
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if (active) { |
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pm_runtime_mark_last_busy(dev); |
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return -EBUSY; |
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} |
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omap4_keypad_scan_keys(keypad_data, 0); |
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return 0; |
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} |
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static const struct dev_pm_ops omap4_keypad_pm_ops = { |
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SET_RUNTIME_PM_OPS(omap4_keypad_runtime_suspend, NULL, NULL) |
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}; |
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static void omap4_disable_pm(void *d) |
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{ |
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pm_runtime_dont_use_autosuspend(d); |
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pm_runtime_disable(d); |
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} |
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static int omap4_keypad_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct omap4_keypad *keypad_data; |
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struct input_dev *input_dev; |
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struct resource *res; |
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unsigned int max_keys; |
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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 base address specified\n"); |
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return -EINVAL; |
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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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return irq; |
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keypad_data = devm_kzalloc(dev, sizeof(*keypad_data), GFP_KERNEL); |
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if (!keypad_data) { |
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dev_err(dev, "keypad_data memory allocation failed\n"); |
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return -ENOMEM; |
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} |
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keypad_data->irq = irq; |
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mutex_init(&keypad_data->lock); |
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platform_set_drvdata(pdev, keypad_data); |
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error = omap4_keypad_parse_dt(dev, keypad_data); |
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if (error) |
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return error; |
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keypad_data->base = devm_ioremap_resource(dev, res); |
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if (IS_ERR(keypad_data->base)) |
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return PTR_ERR(keypad_data->base); |
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pm_runtime_use_autosuspend(dev); |
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pm_runtime_set_autosuspend_delay(dev, OMAP4_KEYPAD_IDLE_CHECK_MS); |
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pm_runtime_enable(dev); |
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error = devm_add_action_or_reset(dev, omap4_disable_pm, dev); |
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if (error) { |
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dev_err(dev, "unable to register cleanup action\n"); |
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return error; |
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} |
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/* |
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* Enable clocks for the keypad module so that we can read |
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* revision register. |
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*/ |
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error = pm_runtime_get_sync(dev); |
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if (error) { |
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dev_err(dev, "pm_runtime_get_sync() failed\n"); |
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pm_runtime_put_noidle(dev); |
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return error; |
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} |
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error = omap4_keypad_check_revision(dev, keypad_data); |
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if (!error) { |
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/* Ensure device does not raise interrupts */ |
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omap4_keypad_stop(keypad_data); |
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} |
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pm_runtime_mark_last_busy(dev); |
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pm_runtime_put_autosuspend(dev); |
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if (error) |
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return error; |
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/* input device allocation */ |
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keypad_data->input = input_dev = devm_input_allocate_device(dev); |
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if (!input_dev) |
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return -ENOMEM; |
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input_dev->name = pdev->name; |
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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 = 0x0001; |
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input_dev->open = omap4_keypad_open; |
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input_dev->close = omap4_keypad_close; |
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input_set_capability(input_dev, EV_MSC, MSC_SCAN); |
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if (!keypad_data->no_autorepeat) |
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__set_bit(EV_REP, input_dev->evbit); |
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input_set_drvdata(input_dev, keypad_data); |
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keypad_data->row_shift = get_count_order(keypad_data->cols); |
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max_keys = keypad_data->rows << keypad_data->row_shift; |
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keypad_data->keymap = devm_kcalloc(dev, |
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max_keys, |
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sizeof(keypad_data->keymap[0]), |
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GFP_KERNEL); |
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if (!keypad_data->keymap) { |
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dev_err(dev, "Not enough memory for keymap\n"); |
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return -ENOMEM; |
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} |
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error = matrix_keypad_build_keymap(NULL, NULL, |
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keypad_data->rows, keypad_data->cols, |
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keypad_data->keymap, input_dev); |
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if (error) { |
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dev_err(dev, "failed to build keymap\n"); |
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return error; |
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} |
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error = devm_request_threaded_irq(dev, keypad_data->irq, |
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omap4_keypad_irq_handler, |
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omap4_keypad_irq_thread_fn, |
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IRQF_ONESHOT, |
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"omap4-keypad", keypad_data); |
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if (error) { |
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dev_err(dev, "failed to register interrupt\n"); |
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return error; |
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} |
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error = input_register_device(keypad_data->input); |
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if (error) { |
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dev_err(dev, "failed to register input device\n"); |
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return error; |
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} |
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device_init_wakeup(dev, true); |
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error = dev_pm_set_wake_irq(dev, keypad_data->irq); |
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if (error) |
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dev_warn(dev, "failed to set up wakeup irq: %d\n", error); |
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return 0; |
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} |
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static int omap4_keypad_remove(struct platform_device *pdev) |
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{ |
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dev_pm_clear_wake_irq(&pdev->dev); |
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return 0; |
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} |
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static const struct of_device_id omap_keypad_dt_match[] = { |
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{ .compatible = "ti,omap4-keypad" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, omap_keypad_dt_match); |
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static struct platform_driver omap4_keypad_driver = { |
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.probe = omap4_keypad_probe, |
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.remove = omap4_keypad_remove, |
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.driver = { |
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.name = "omap4-keypad", |
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.of_match_table = omap_keypad_dt_match, |
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.pm = &omap4_keypad_pm_ops, |
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}, |
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}; |
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module_platform_driver(omap4_keypad_driver); |
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MODULE_AUTHOR("Texas Instruments"); |
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MODULE_DESCRIPTION("OMAP4 Keypad Driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:omap4-keypad");
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