cregit-Linux how code gets into the kernel

Release 4.11 drivers/input/keyboard/pmic8xxx-keypad.c

/* Copyright (c) 2009-2011, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/regmap.h>
#include <linux/of.h>
#include <linux/input/matrix_keypad.h>


#define PM8XXX_MAX_ROWS		18

#define PM8XXX_MAX_COLS		8

#define PM8XXX_ROW_SHIFT	3

#define PM8XXX_MATRIX_MAX_SIZE	(PM8XXX_MAX_ROWS * PM8XXX_MAX_COLS)


#define PM8XXX_MIN_ROWS		5

#define PM8XXX_MIN_COLS		5


#define MAX_SCAN_DELAY		128

#define MIN_SCAN_DELAY		1

/* in nanoseconds */

#define MAX_ROW_HOLD_DELAY	122000

#define MIN_ROW_HOLD_DELAY	30500


#define MAX_DEBOUNCE_TIME	20

#define MIN_DEBOUNCE_TIME	5


#define KEYP_CTRL			0x148


#define KEYP_CTRL_EVNTS			BIT(0)

#define KEYP_CTRL_EVNTS_MASK		0x3


#define KEYP_CTRL_SCAN_COLS_SHIFT	5

#define KEYP_CTRL_SCAN_COLS_MIN		5

#define KEYP_CTRL_SCAN_COLS_BITS	0x3


#define KEYP_CTRL_SCAN_ROWS_SHIFT	2

#define KEYP_CTRL_SCAN_ROWS_MIN		5

#define KEYP_CTRL_SCAN_ROWS_BITS	0x7


#define KEYP_CTRL_KEYP_EN		BIT(7)


#define KEYP_SCAN			0x149


#define KEYP_SCAN_READ_STATE		BIT(0)

#define KEYP_SCAN_DBOUNCE_SHIFT		1

#define KEYP_SCAN_PAUSE_SHIFT		3

#define KEYP_SCAN_ROW_HOLD_SHIFT	6


#define KEYP_TEST			0x14A


#define KEYP_TEST_CLEAR_RECENT_SCAN	BIT(6)

#define KEYP_TEST_CLEAR_OLD_SCAN	BIT(5)

#define KEYP_TEST_READ_RESET		BIT(4)

#define KEYP_TEST_DTEST_EN		BIT(3)

#define KEYP_TEST_ABORT_READ		BIT(0)


#define KEYP_TEST_DBG_SELECT_SHIFT	1

/* bits of these registers represent
 * '0' for key press
 * '1' for key release
 */

#define KEYP_RECENT_DATA		0x14B

#define KEYP_OLD_DATA			0x14C


#define KEYP_CLOCK_FREQ			32768

/**
 * struct pmic8xxx_kp - internal keypad data structure
 * @num_cols - number of columns of keypad
 * @num_rows - number of row of keypad
 * @input - input device pointer for keypad
 * @regmap - regmap handle
 * @key_sense_irq - key press/release irq number
 * @key_stuck_irq - key stuck notification irq number
 * @keycodes - array to hold the key codes
 * @dev - parent device pointer
 * @keystate - present key press/release state
 * @stuckstate - present state when key stuck irq
 * @ctrl_reg - control register value
 */

struct pmic8xxx_kp {
	
unsigned int num_rows;
	
unsigned int num_cols;
	
struct input_dev *input;
	
struct regmap *regmap;
	
int key_sense_irq;
	
int key_stuck_irq;

	
unsigned short keycodes[PM8XXX_MATRIX_MAX_SIZE];

	
struct device *dev;
	
u16 keystate[PM8XXX_MAX_ROWS];
	
u16 stuckstate[PM8XXX_MAX_ROWS];

	
u8 ctrl_reg;
};


static u8 pmic8xxx_col_state(struct pmic8xxx_kp *kp, u8 col) { /* all keys pressed on that particular row? */ if (col == 0x00) return 1 << kp->num_cols; else return col & ((1 << kp->num_cols) - 1); }

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/* * Synchronous read protocol for RevB0 onwards: * * 1. Write '1' to ReadState bit in KEYP_SCAN register * 2. Wait 2*32KHz clocks, so that HW can successfully enter read mode * synchronously * 3. Read rows in old array first if events are more than one * 4. Read rows in recent array * 5. Wait 4*32KHz clocks * 6. Write '0' to ReadState bit of KEYP_SCAN register so that hw can * synchronously exit read mode. */
static int pmic8xxx_chk_sync_read(struct pmic8xxx_kp *kp) { int rc; unsigned int scan_val; rc = regmap_read(kp->regmap, KEYP_SCAN, &scan_val); if (rc < 0) { dev_err(kp->dev, "Error reading KEYP_SCAN reg, rc=%d\n", rc); return rc; } scan_val |= 0x1; rc = regmap_write(kp->regmap, KEYP_SCAN, scan_val); if (rc < 0) { dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc); return rc; } /* 2 * 32KHz clocks */ udelay((2 * DIV_ROUND_UP(USEC_PER_SEC, KEYP_CLOCK_FREQ)) + 1); return rc; }

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static int pmic8xxx_kp_read_data(struct pmic8xxx_kp *kp, u16 *state, u16 data_reg, int read_rows) { int rc, row; unsigned int val; for (row = 0; row < read_rows; row++) { rc = regmap_read(kp->regmap, data_reg, &val); if (rc) return rc; dev_dbg(kp->dev, "%d = %d\n", row, val); state[row] = pmic8xxx_col_state(kp, val); } return 0; }

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static int pmic8xxx_kp_read_matrix(struct pmic8xxx_kp *kp, u16 *new_state, u16 *old_state) { int rc, read_rows; unsigned int scan_val; if (kp->num_rows < PM8XXX_MIN_ROWS) read_rows = PM8XXX_MIN_ROWS; else read_rows = kp->num_rows; pmic8xxx_chk_sync_read(kp); if (old_state) { rc = pmic8xxx_kp_read_data(kp, old_state, KEYP_OLD_DATA, read_rows); if (rc < 0) { dev_err(kp->dev, "Error reading KEYP_OLD_DATA, rc=%d\n", rc); return rc; } } rc = pmic8xxx_kp_read_data(kp, new_state, KEYP_RECENT_DATA, read_rows); if (rc < 0) { dev_err(kp->dev, "Error reading KEYP_RECENT_DATA, rc=%d\n", rc); return rc; } /* 4 * 32KHz clocks */ udelay((4 * DIV_ROUND_UP(USEC_PER_SEC, KEYP_CLOCK_FREQ)) + 1); rc = regmap_read(kp->regmap, KEYP_SCAN, &scan_val); if (rc < 0) { dev_err(kp->dev, "Error reading KEYP_SCAN reg, rc=%d\n", rc); return rc; } scan_val &= 0xFE; rc = regmap_write(kp->regmap, KEYP_SCAN, scan_val); if (rc < 0) dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc); return rc; }

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static void __pmic8xxx_kp_scan_matrix(struct pmic8xxx_kp *kp, u16 *new_state, u16 *old_state) { int row, col, code; for (row = 0; row < kp->num_rows; row++) { int bits_changed = new_state[row] ^ old_state[row]; if (!bits_changed) continue; for (col = 0; col < kp->num_cols; col++) { if (!(bits_changed & (1 << col))) continue; dev_dbg(kp->dev, "key [%d:%d] %s\n", row, col, !(new_state[row] & (1 << col)) ? "pressed" : "released"); code = MATRIX_SCAN_CODE(row, col, PM8XXX_ROW_SHIFT); input_event(kp->input, EV_MSC, MSC_SCAN, code); input_report_key(kp->input, kp->keycodes[code], !(new_state[row] & (1 << col))); input_sync(kp->input); } } }

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static bool pmic8xxx_detect_ghost_keys(struct pmic8xxx_kp *kp, u16 *new_state) { int row, found_first = -1; u16 check, row_state; check = 0; for (row = 0; row < kp->num_rows; row++) { row_state = (~new_state[row]) & ((1 << kp->num_cols) - 1); if (hweight16(row_state) > 1) { if (found_first == -1) found_first = row; if (check & row_state) { dev_dbg(kp->dev, "detected ghost key on row[%d]" " and row[%d]\n", found_first, row); return true; } } check |= row_state; } return false; }

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static int pmic8xxx_kp_scan_matrix(struct pmic8xxx_kp *kp, unsigned int events) { u16 new_state[PM8XXX_MAX_ROWS]; u16 old_state[PM8XXX_MAX_ROWS]; int rc; switch (events) { case 0x1: rc = pmic8xxx_kp_read_matrix(kp, new_state, NULL); if (rc < 0) return rc; /* detecting ghost key is not an error */ if (pmic8xxx_detect_ghost_keys(kp, new_state)) return 0; __pmic8xxx_kp_scan_matrix(kp, new_state, kp->keystate); memcpy(kp->keystate, new_state, sizeof(new_state)); break; case 0x3: /* two events - eventcounter is gray-coded */ rc = pmic8xxx_kp_read_matrix(kp, new_state, old_state); if (rc < 0) return rc; __pmic8xxx_kp_scan_matrix(kp, old_state, kp->keystate); __pmic8xxx_kp_scan_matrix(kp, new_state, old_state); memcpy(kp->keystate, new_state, sizeof(new_state)); break; case 0x2: dev_dbg(kp->dev, "Some key events were lost\n"); rc = pmic8xxx_kp_read_matrix(kp, new_state, old_state); if (rc < 0) return rc; __pmic8xxx_kp_scan_matrix(kp, old_state, kp->keystate); __pmic8xxx_kp_scan_matrix(kp, new_state, old_state); memcpy(kp->keystate, new_state, sizeof(new_state)); break; default: rc = -EINVAL; } return rc; }

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/* * NOTE: We are reading recent and old data registers blindly * whenever key-stuck interrupt happens, because events counter doesn't * get updated when this interrupt happens due to key stuck doesn't get * considered as key state change. * * We are not using old data register contents after they are being read * because it might report the key which was pressed before the key being stuck * as stuck key because it's pressed status is stored in the old data * register. */
static irqreturn_t pmic8xxx_kp_stuck_irq(int irq, void *data) { u16 new_state[PM8XXX_MAX_ROWS]; u16 old_state[PM8XXX_MAX_ROWS]; int rc; struct pmic8xxx_kp *kp = data; rc = pmic8xxx_kp_read_matrix(kp, new_state, old_state); if (rc < 0) { dev_err(kp->dev, "failed to read keypad matrix\n"); return IRQ_HANDLED; } __pmic8xxx_kp_scan_matrix(kp, new_state, kp->stuckstate); return IRQ_HANDLED; }

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static irqreturn_t pmic8xxx_kp_irq(int irq, void *data) { struct pmic8xxx_kp *kp = data; unsigned int ctrl_val, events; int rc; rc = regmap_read(kp->regmap, KEYP_CTRL, &ctrl_val); if (rc < 0) { dev_err(kp->dev, "failed to read keyp_ctrl register\n"); return IRQ_HANDLED; } events = ctrl_val & KEYP_CTRL_EVNTS_MASK; rc = pmic8xxx_kp_scan_matrix(kp, events); if (rc < 0) dev_err(kp->dev, "failed to scan matrix\n"); return IRQ_HANDLED; }

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static int pmic8xxx_kpd_init(struct pmic8xxx_kp *kp, struct platform_device *pdev) { const struct device_node *of_node = pdev->dev.of_node; unsigned int scan_delay_ms; unsigned int row_hold_ns; unsigned int debounce_ms; int bits, rc, cycles; u8 scan_val = 0, ctrl_val = 0; static const u8 row_bits[] = { 0, 1, 2, 3, 4, 4, 5, 5, 6, 6, 6, 7, 7, 7, }; /* Find column bits */ if (kp->num_cols < KEYP_CTRL_SCAN_COLS_MIN) bits = 0; else bits = kp->num_cols - KEYP_CTRL_SCAN_COLS_MIN; ctrl_val = (bits & KEYP_CTRL_SCAN_COLS_BITS) << KEYP_CTRL_SCAN_COLS_SHIFT; /* Find row bits */ if (kp->num_rows < KEYP_CTRL_SCAN_ROWS_MIN) bits = 0; else bits = row_bits[kp->num_rows - KEYP_CTRL_SCAN_ROWS_MIN]; ctrl_val |= (bits << KEYP_CTRL_SCAN_ROWS_SHIFT); rc = regmap_write(kp->regmap, KEYP_CTRL, ctrl_val); if (rc < 0) { dev_err(kp->dev, "Error writing KEYP_CTRL reg, rc=%d\n", rc); return rc; } if (of_property_read_u32(of_node, "scan-delay", &scan_delay_ms)) scan_delay_ms = MIN_SCAN_DELAY; if (scan_delay_ms > MAX_SCAN_DELAY || scan_delay_ms < MIN_SCAN_DELAY || !is_power_of_2(scan_delay_ms)) { dev_err(&pdev->dev, "invalid keypad scan time supplied\n"); return -EINVAL; } if (of_property_read_u32(of_node, "row-hold", &row_hold_ns)) row_hold_ns = MIN_ROW_HOLD_DELAY; if (row_hold_ns > MAX_ROW_HOLD_DELAY || row_hold_ns < MIN_ROW_HOLD_DELAY || ((row_hold_ns % MIN_ROW_HOLD_DELAY) != 0)) { dev_err(&pdev->dev, "invalid keypad row hold time supplied\n"); return -EINVAL; } if (of_property_read_u32(of_node, "debounce", &debounce_ms)) debounce_ms = MIN_DEBOUNCE_TIME; if (((debounce_ms % 5) != 0) || debounce_ms > MAX_DEBOUNCE_TIME || debounce_ms < MIN_DEBOUNCE_TIME) { dev_err(&pdev->dev, "invalid debounce time supplied\n"); return -EINVAL; } bits = (debounce_ms / 5) - 1; scan_val |= (bits << KEYP_SCAN_DBOUNCE_SHIFT); bits = fls(scan_delay_ms) - 1; scan_val |= (bits << KEYP_SCAN_PAUSE_SHIFT); /* Row hold time is a multiple of 32KHz cycles. */ cycles = (row_hold_ns * KEYP_CLOCK_FREQ) / NSEC_PER_SEC; scan_val |= (cycles << KEYP_SCAN_ROW_HOLD_SHIFT); rc = regmap_write(kp->regmap, KEYP_SCAN, scan_val); if (rc) dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc); return rc; }

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static int pmic8xxx_kp_enable(struct pmic8xxx_kp *kp) { int rc; kp->ctrl_reg |= KEYP_CTRL_KEYP_EN; rc = regmap_write(kp->regmap, KEYP_CTRL, kp->ctrl_reg); if (rc < 0) dev_err(kp->dev, "Error writing KEYP_CTRL reg, rc=%d\n", rc); return rc; }

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static int pmic8xxx_kp_disable(struct pmic8xxx_kp *kp) { int rc; kp->ctrl_reg &= ~KEYP_CTRL_KEYP_EN; rc = regmap_write(kp->regmap, KEYP_CTRL, kp->ctrl_reg); if (rc < 0) return rc; return rc; }

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static int pmic8xxx_kp_open(struct input_dev *dev) { struct pmic8xxx_kp *kp = input_get_drvdata(dev); return pmic8xxx_kp_enable(kp); }

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static void pmic8xxx_kp_close(struct input_dev *dev) { struct pmic8xxx_kp *kp = input_get_drvdata(dev); pmic8xxx_kp_disable(kp); }

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/* * keypad controller should be initialized in the following sequence * only, otherwise it might get into FSM stuck state. * * - Initialize keypad control parameters, like no. of rows, columns, * timing values etc., * - configure rows and column gpios pull up/down. * - set irq edge type. * - enable the keypad controller. */
static int pmic8xxx_kp_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; unsigned int rows, cols; bool repeat; bool wakeup; struct pmic8xxx_kp *kp; int rc; unsigned int ctrl_val; rc = matrix_keypad_parse_properties(&pdev->dev, &rows, &cols); if (rc) return rc; if (cols > PM8XXX_MAX_COLS || rows > PM8XXX_MAX_ROWS || cols < PM8XXX_MIN_COLS) { dev_err(&pdev->dev, "invalid platform data\n"); return -EINVAL; } repeat = !of_property_read_bool(np, "linux,input-no-autorepeat"); wakeup = of_property_read_bool(np, "wakeup-source") || /* legacy name */ of_property_read_bool(np, "linux,keypad-wakeup"); kp = devm_kzalloc(&pdev->dev, sizeof(*kp), GFP_KERNEL); if (!kp) return -ENOMEM; kp->regmap = dev_get_regmap(pdev->dev.parent, NULL); if (!kp->regmap) return -ENODEV; platform_set_drvdata(pdev, kp); kp->num_rows = rows; kp->num_cols = cols; kp->dev = &pdev->dev; kp->input = devm_input_allocate_device(&pdev->dev); if (!kp->input) { dev_err(&pdev->dev, "unable to allocate input device\n"); return -ENOMEM; } kp->key_sense_irq = platform_get_irq(pdev, 0); if (kp->key_sense_irq < 0) { dev_err(&pdev->dev, "unable to get keypad sense irq\n"); return kp->key_sense_irq; } kp->key_stuck_irq = platform_get_irq(pdev, 1); if (kp->key_stuck_irq < 0) { dev_err(&pdev->dev, "unable to get keypad stuck irq\n"); return kp->key_stuck_irq; } kp->input->name = "PMIC8XXX keypad"; kp->input->phys = "pmic8xxx_keypad/input0"; kp->input->id.bustype = BUS_I2C; kp->input->id.version = 0x0001; kp->input->id.product = 0x0001; kp->input->id.vendor = 0x0001; kp->input->open = pmic8xxx_kp_open; kp->input->close = pmic8xxx_kp_close; rc = matrix_keypad_build_keymap(NULL, NULL, PM8XXX_MAX_ROWS, PM8XXX_MAX_COLS, kp->keycodes, kp->input); if (rc) { dev_err(&pdev->dev, "failed to build keymap\n"); return rc; } if (repeat) __set_bit(EV_REP, kp->input->evbit); input_set_capability(kp->input, EV_MSC, MSC_SCAN); input_set_drvdata(kp->input, kp); /* initialize keypad state */ memset(kp->keystate, 0xff, sizeof(kp->keystate)); memset(kp->stuckstate, 0xff, sizeof(kp->stuckstate)); rc = pmic8xxx_kpd_init(kp, pdev); if (rc < 0) { dev_err(&pdev->dev, "unable to initialize keypad controller\n"); return rc; } rc = devm_request_any_context_irq(&pdev->dev, kp->key_sense_irq, pmic8xxx_kp_irq, IRQF_TRIGGER_RISING, "pmic-keypad", kp); if (rc < 0) { dev_err(&pdev->dev, "failed to request keypad sense irq\n"); return rc; } rc = devm_request_any_context_irq(&pdev->dev, kp->key_stuck_irq, pmic8xxx_kp_stuck_irq, IRQF_TRIGGER_RISING, "pmic-keypad-stuck", kp); if (rc < 0) { dev_err(&pdev->dev, "failed to request keypad stuck irq\n"); return rc; } rc = regmap_read(kp->regmap, KEYP_CTRL, &ctrl_val); if (rc < 0) { dev_err(&pdev->dev, "failed to read KEYP_CTRL register\n"); return rc; } kp->ctrl_reg = ctrl_val; rc = input_register_device(kp->input); if (rc < 0) { dev_err(&pdev->dev, "unable to register keypad input device\n"); return rc; } device_init_wakeup(&pdev->dev, wakeup); return 0; }

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#ifdef CONFIG_PM_SLEEP
static int pmic8xxx_kp_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct pmic8xxx_kp *kp = platform_get_drvdata(pdev); struct input_dev *input_dev = kp->input; if (device_may_wakeup(dev)) { enable_irq_wake(kp->key_sense_irq); } else { mutex_lock(&input_dev->mutex); if (input_dev->users) pmic8xxx_kp_disable(kp); mutex_unlock(&input_dev->mutex); } return 0; }

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static int pmic8xxx_kp_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct pmic8xxx_kp *kp = platform_get_drvdata(pdev); struct input_dev *input_dev = kp->input; if (device_may_wakeup(dev)) { disable_irq_wake(kp->key_sense_irq); } else { mutex_lock(&input_dev->mutex); if (input_dev->users) pmic8xxx_kp_enable(kp); mutex_unlock(&input_dev->mutex); } return 0; }

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#endif static SIMPLE_DEV_PM_OPS(pm8xxx_kp_pm_ops, pmic8xxx_kp_suspend, pmic8xxx_kp_resume); static const struct of_device_id pm8xxx_match_table[] = { { .compatible = "qcom,pm8058-keypad" }, { .compatible = "qcom,pm8921-keypad" }, { } }; MODULE_DEVICE_TABLE(of, pm8xxx_match_table); static struct platform_driver pmic8xxx_kp_driver = { .probe = pmic8xxx_kp_probe, .driver = { .name = "pm8xxx-keypad", .pm = &pm8xxx_kp_pm_ops, .of_match_table = pm8xxx_match_table, }, }; module_platform_driver(pmic8xxx_kp_driver); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("PMIC8XXX keypad driver"); MODULE_VERSION("1.0"