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Release 4.11 drivers/input/keyboard/nspire-keypad.c

/*
 *  Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2, as
 * published by the Free Software Foundation.
 */

#include <linux/input/matrix_keypad.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of.h>


#define KEYPAD_SCAN_MODE	0x00

#define KEYPAD_CNTL		0x04

#define KEYPAD_INT		0x08

#define KEYPAD_INTMSK		0x0C


#define KEYPAD_DATA		0x10

#define KEYPAD_GPIO		0x30


#define KEYPAD_UNKNOWN_INT	0x40

#define KEYPAD_UNKNOWN_INT_STS	0x44


#define KEYPAD_BITMASK_COLS	11

#define KEYPAD_BITMASK_ROWS	8


struct nspire_keypad {
	
void __iomem *reg_base;
	
u32 int_mask;

	
struct input_dev *input;
	
struct clk *clk;

	
struct matrix_keymap_data *keymap;
	
int row_shift;

	/* Maximum delay estimated assuming 33MHz APB */
	
u32 scan_interval;	/* In microseconds (~2000us max) */
	
u32 row_delay;		/* In microseconds (~500us max) */

	
u16 state[KEYPAD_BITMASK_ROWS];

	
bool active_low;
};


static irqreturn_t nspire_keypad_irq(int irq, void *dev_id) { struct nspire_keypad *keypad = dev_id; struct input_dev *input = keypad->input; unsigned short *keymap = input->keycode; unsigned int code; int row, col; u32 int_sts; u16 state[8]; u16 bits, changed; int_sts = readl(keypad->reg_base + KEYPAD_INT) & keypad->int_mask; if (!int_sts) return IRQ_NONE; memcpy_fromio(state, keypad->reg_base + KEYPAD_DATA, sizeof(state)); for (row = 0; row < KEYPAD_BITMASK_ROWS; row++) { bits = state[row]; if (keypad->active_low) bits = ~bits; changed = bits ^ keypad->state[row]; if (!changed) continue; keypad->state[row] = bits; for (col = 0; col < KEYPAD_BITMASK_COLS; col++) { if (!(changed & (1U << col))) continue; code = MATRIX_SCAN_CODE(row, col, keypad->row_shift); input_event(input, EV_MSC, MSC_SCAN, code); input_report_key(input, keymap[code], bits & (1U << col)); } } input_sync(input); writel(0x3, keypad->reg_base + KEYPAD_INT); return IRQ_HANDLED; }

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static int nspire_keypad_chip_init(struct nspire_keypad *keypad) { unsigned long val = 0, cycles_per_us, delay_cycles, row_delay_cycles; cycles_per_us = (clk_get_rate(keypad->clk) / 1000000); if (cycles_per_us == 0) cycles_per_us = 1; delay_cycles = cycles_per_us * keypad->scan_interval; WARN_ON(delay_cycles >= (1 << 16)); /* Overflow */ delay_cycles &= 0xffff; row_delay_cycles = cycles_per_us * keypad->row_delay; WARN_ON(row_delay_cycles >= (1 << 14)); /* Overflow */ row_delay_cycles &= 0x3fff; val |= 3 << 0; /* Set scan mode to 3 (continuous scan) */ val |= row_delay_cycles << 2; /* Delay between scanning each row */ val |= delay_cycles << 16; /* Delay between scans */ writel(val, keypad->reg_base + KEYPAD_SCAN_MODE); val = (KEYPAD_BITMASK_ROWS & 0xff) | (KEYPAD_BITMASK_COLS & 0xff)<<8; writel(val, keypad->reg_base + KEYPAD_CNTL); /* Enable interrupts */ keypad->int_mask = 1 << 1; writel(keypad->int_mask, keypad->reg_base + KEYPAD_INTMSK); /* Disable GPIO interrupts to prevent hanging on touchpad */ /* Possibly used to detect touchpad events */ writel(0, keypad->reg_base + KEYPAD_UNKNOWN_INT); /* Acknowledge existing interrupts */ writel(~0, keypad->reg_base + KEYPAD_UNKNOWN_INT_STS); return 0; }

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static int nspire_keypad_open(struct input_dev *input) { struct nspire_keypad *keypad = input_get_drvdata(input); int error; error = clk_prepare_enable(keypad->clk); if (error) return error; error = nspire_keypad_chip_init(keypad); if (error) { clk_disable_unprepare(keypad->clk); return error; } return 0; }

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Wei Yongjun913.64%150.00%
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static void nspire_keypad_close(struct input_dev *input) { struct nspire_keypad *keypad = input_get_drvdata(input); clk_disable_unprepare(keypad->clk); }

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static int nspire_keypad_probe(struct platform_device *pdev) { const struct device_node *of_node = pdev->dev.of_node; struct nspire_keypad *keypad; struct input_dev *input; struct resource *res; int irq; int error; irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_err(&pdev->dev, "failed to get keypad irq\n"); return -EINVAL; } keypad = devm_kzalloc(&pdev->dev, sizeof(struct nspire_keypad), GFP_KERNEL); if (!keypad) { dev_err(&pdev->dev, "failed to allocate keypad memory\n"); return -ENOMEM; } keypad->row_shift = get_count_order(KEYPAD_BITMASK_COLS); error = of_property_read_u32(of_node, "scan-interval", &keypad->scan_interval); if (error) { dev_err(&pdev->dev, "failed to get scan-interval\n"); return error; } error = of_property_read_u32(of_node, "row-delay", &keypad->row_delay); if (error) { dev_err(&pdev->dev, "failed to get row-delay\n"); return error; } keypad->active_low = of_property_read_bool(of_node, "active-low"); keypad->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(keypad->clk)) { dev_err(&pdev->dev, "unable to get clock\n"); return PTR_ERR(keypad->clk); } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); keypad->reg_base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(keypad->reg_base)) return PTR_ERR(keypad->reg_base); keypad->input = input = devm_input_allocate_device(&pdev->dev); if (!input) { dev_err(&pdev->dev, "failed to allocate input device\n"); return -ENOMEM; } input_set_drvdata(input, keypad); input->id.bustype = BUS_HOST; input->name = "nspire-keypad"; input->open = nspire_keypad_open; input->close = nspire_keypad_close; __set_bit(EV_KEY, input->evbit); __set_bit(EV_REP, input->evbit); input_set_capability(input, EV_MSC, MSC_SCAN); error = matrix_keypad_build_keymap(NULL, NULL, KEYPAD_BITMASK_ROWS, KEYPAD_BITMASK_COLS, NULL, input); if (error) { dev_err(&pdev->dev, "building keymap failed\n"); return error; } error = devm_request_irq(&pdev->dev, irq, nspire_keypad_irq, 0, "nspire_keypad", keypad); if (error) { dev_err(&pdev->dev, "allocate irq %d failed\n", irq); return error; } error = input_register_device(input); if (error) { dev_err(&pdev->dev, "unable to register input device: %d\n", error); return error; } dev_dbg(&pdev->dev, "TI-NSPIRE keypad at %pR (scan_interval=%uus, row_delay=%uus%s)\n", res, keypad->row_delay, keypad->scan_interval, keypad->active_low ? ", active_low" : ""); return 0; }

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static const struct of_device_id nspire_keypad_dt_match[] = { { .compatible = "ti,nspire-keypad" }, { }, }; MODULE_DEVICE_TABLE(of, nspire_keypad_dt_match); static struct platform_driver nspire_keypad_driver = { .driver = { .name = "nspire-keypad", .of_match_table = nspire_keypad_dt_match, }, .probe = nspire_keypad_probe, }; module_platform_driver(nspire_keypad_driver); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("TI-NSPIRE Keypad Driver");

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Wei Yongjun90.72%125.00%
Total1250100.00%4100.00%
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