cregit-Linux how code gets into the kernel

Release 4.11 drivers/input/keyboard/nomadik-ske-keypad.c

/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson
 * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
 *
 * License terms:GNU General Public License (GPL) version 2
 *
 * Keypad controller driver for the SKE (Scroll Key Encoder) module used in
 * the Nomadik 8815 and Ux500 platforms.
 */

#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/spinlock.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/platform_data/keypad-nomadik-ske.h>

/* SKE_CR bits */

#define SKE_KPMLT	(0x1 << 6)

#define SKE_KPCN	(0x7 << 3)

#define SKE_KPASEN	(0x1 << 2)

#define SKE_KPASON	(0x1 << 7)

/* SKE_IMSC bits */

#define SKE_KPIMA	(0x1 << 2)

/* SKE_ICR bits */

#define SKE_KPICS	(0x1 << 3)

#define SKE_KPICA	(0x1 << 2)

/* SKE_RIS bits */

#define SKE_KPRISA	(0x1 << 2)


#define SKE_KEYPAD_ROW_SHIFT	3

#define SKE_KPD_NUM_ROWS	8

#define SKE_KPD_NUM_COLS	8

/* keypad auto scan registers */

#define SKE_ASR0	0x20

#define SKE_ASR1	0x24

#define SKE_ASR2	0x28

#define SKE_ASR3	0x2C


#define SKE_NUM_ASRX_REGISTERS	(4)

#define	KEY_PRESSED_DELAY	10

/**
 * struct ske_keypad  - data structure used by keypad driver
 * @irq:        irq no
 * @reg_base:   ske registers base address
 * @input:      pointer to input device object
 * @board:      keypad platform device
 * @keymap:     matrix scan code table for keycodes
 * @clk:        clock structure pointer
 */

struct ske_keypad {
	
int irq;
	
void __iomem *reg_base;
	
struct input_dev *input;
	
const struct ske_keypad_platform_data *board;
	
unsigned short keymap[SKE_KPD_NUM_ROWS * SKE_KPD_NUM_COLS];
	
struct clk *clk;
	
struct clk *pclk;
	
spinlock_t ske_keypad_lock;
};


static void ske_keypad_set_bits(struct ske_keypad *keypad, u16 addr, u8 mask, u8 data) { u32 ret; spin_lock(&keypad->ske_keypad_lock); ret = readl(keypad->reg_base + addr); ret &= ~mask; ret |= data; writel(ret, keypad->reg_base + addr); spin_unlock(&keypad->ske_keypad_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Sundar R Iyer70100.00%1100.00%
Total70100.00%1100.00%

/* * ske_keypad_chip_init: init keypad controller configuration * * Enable Multi key press detection, auto scan mode */
static int __init ske_keypad_chip_init(struct ske_keypad *keypad) { u32 value; int timeout = keypad->board->debounce_ms; /* check SKE_RIS to be 0 */ while ((readl(keypad->reg_base + SKE_RIS) != 0x00000000) && timeout--) cpu_relax(); if (!timeout) return -EINVAL; /* * set debounce value * keypad dbounce is configured in DBCR[15:8] * dbounce value in steps of 32/32.768 ms */ spin_lock(&keypad->ske_keypad_lock); value = readl(keypad->reg_base + SKE_DBCR); value = value & 0xff; value |= ((keypad->board->debounce_ms * 32000)/32768) << 8; writel(value, keypad->reg_base + SKE_DBCR); spin_unlock(&keypad->ske_keypad_lock); /* enable multi key detection */ ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPMLT); /* * set up the number of columns * KPCN[5:3] defines no. of keypad columns to be auto scanned */ value = (keypad->board->kcol - 1) << 3; ske_keypad_set_bits(keypad, SKE_CR, SKE_KPCN, value); /* clear keypad interrupt for auto(and pending SW) scans */ ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA | SKE_KPICS); /* un-mask keypad interrupts */ ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA); /* enable automatic scan */ ske_keypad_set_bits(keypad, SKE_CR, 0x0, SKE_KPASEN); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sundar R Iyer19196.95%133.33%
Naveen Kumar Gaddipati52.54%133.33%
Dmitry Torokhov10.51%133.33%
Total197100.00%3100.00%


static void ske_keypad_report(struct ske_keypad *keypad, u8 status, int col) { int row = 0, code, pos; struct input_dev *input = keypad->input; u32 ske_ris; int key_pressed; int num_of_rows; /* find out the row */ num_of_rows = hweight8(status); do { pos = __ffs(status); row = pos; status &= ~(1 << pos); code = MATRIX_SCAN_CODE(row, col, SKE_KEYPAD_ROW_SHIFT); ske_ris = readl(keypad->reg_base + SKE_RIS); key_pressed = ske_ris & SKE_KPRISA; input_event(input, EV_MSC, MSC_SCAN, code); input_report_key(input, keypad->keymap[code], key_pressed); input_sync(input); num_of_rows--; } while (num_of_rows); }

Contributors

PersonTokensPropCommitsCommitProp
Naveen Kumar Gaddipati12387.23%150.00%
Sundar R Iyer1812.77%150.00%
Total141100.00%2100.00%


static void ske_keypad_read_data(struct ske_keypad *keypad) { u8 status; int col = 0; int ske_asr, i; /* * Read the auto scan registers * * Each SKE_ASRx (x=0 to x=3) contains two row values. * lower byte contains row value for column 2*x, * upper byte contains row value for column 2*x + 1 */ for (i = 0; i < SKE_NUM_ASRX_REGISTERS; i++) { ske_asr = readl(keypad->reg_base + SKE_ASR0 + (4 * i)); if (!ske_asr) continue; /* now that ASRx is zero, find out the coloumn x and row y */ status = ske_asr & 0xff; if (status) { col = i * 2; ske_keypad_report(keypad, status, col); } status = (ske_asr & 0xff00) >> 8; if (status) { col = (i * 2) + 1; ske_keypad_report(keypad, status, col); } } }

Contributors

PersonTokensPropCommitsCommitProp
Sundar R Iyer8668.25%150.00%
Naveen Kumar Gaddipati4031.75%150.00%
Total126100.00%2100.00%


static irqreturn_t ske_keypad_irq(int irq, void *dev_id) { struct ske_keypad *keypad = dev_id; int timeout = keypad->board->debounce_ms; /* disable auto scan interrupt; mask the interrupt generated */ ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0); ske_keypad_set_bits(keypad, SKE_ICR, 0x0, SKE_KPICA); while ((readl(keypad->reg_base + SKE_CR) & SKE_KPASON) && --timeout) cpu_relax(); /* SKEx registers are stable and can be read */ ske_keypad_read_data(keypad); /* wait until raw interrupt is clear */ while ((readl(keypad->reg_base + SKE_RIS)) && --timeout) msleep(KEY_PRESSED_DELAY); /* enable auto scan interrupts */ ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA); return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Sundar R Iyer8673.50%133.33%
Naveen Kumar Gaddipati3126.50%266.67%
Total117100.00%3100.00%


static int __init ske_keypad_probe(struct platform_device *pdev) { const struct ske_keypad_platform_data *plat = dev_get_platdata(&pdev->dev); struct ske_keypad *keypad; struct input_dev *input; struct resource *res; int irq; int error; if (!plat) { dev_err(&pdev->dev, "invalid keypad platform data\n"); return -EINVAL; } irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_err(&pdev->dev, "failed to get keypad irq\n"); return -EINVAL; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(&pdev->dev, "missing platform resources\n"); return -EINVAL; } keypad = kzalloc(sizeof(struct ske_keypad), GFP_KERNEL); input = input_allocate_device(); if (!keypad || !input) { dev_err(&pdev->dev, "failed to allocate keypad memory\n"); error = -ENOMEM; goto err_free_mem; } keypad->irq = irq; keypad->board = plat; keypad->input = input; spin_lock_init(&keypad->ske_keypad_lock); if (!request_mem_region(res->start, resource_size(res), pdev->name)) { dev_err(&pdev->dev, "failed to request I/O memory\n"); error = -EBUSY; goto err_free_mem; } keypad->reg_base = ioremap(res->start, resource_size(res)); if (!keypad->reg_base) { dev_err(&pdev->dev, "failed to remap I/O memory\n"); error = -ENXIO; goto err_free_mem_region; } keypad->pclk = clk_get(&pdev->dev, "apb_pclk"); if (IS_ERR(keypad->pclk)) { dev_err(&pdev->dev, "failed to get pclk\n"); error = PTR_ERR(keypad->pclk); goto err_iounmap; } keypad->clk = clk_get(&pdev->dev, NULL); if (IS_ERR(keypad->clk)) { dev_err(&pdev->dev, "failed to get clk\n"); error = PTR_ERR(keypad->clk); goto err_pclk; } input->id.bustype = BUS_HOST; input->name = "ux500-ske-keypad"; input->dev.parent = &pdev->dev; error = matrix_keypad_build_keymap(plat->keymap_data, NULL, SKE_KPD_NUM_ROWS, SKE_KPD_NUM_COLS, keypad->keymap, input); if (error) { dev_err(&pdev->dev, "Failed to build keymap\n"); goto err_clk; } input_set_capability(input, EV_MSC, MSC_SCAN); if (!plat->no_autorepeat) __set_bit(EV_REP, input->evbit); error = clk_prepare_enable(keypad->pclk); if (error) { dev_err(&pdev->dev, "Failed to prepare/enable pclk\n"); goto err_clk; } error = clk_prepare_enable(keypad->clk); if (error) { dev_err(&pdev->dev, "Failed to prepare/enable clk\n"); goto err_pclk_disable; } /* go through board initialization helpers */ if (keypad->board->init) keypad->board->init(); error = ske_keypad_chip_init(keypad); if (error) { dev_err(&pdev->dev, "unable to init keypad hardware\n"); goto err_clk_disable; } error = request_threaded_irq(keypad->irq, NULL, ske_keypad_irq, IRQF_ONESHOT, "ske-keypad", keypad); if (error) { dev_err(&pdev->dev, "allocate irq %d failed\n", keypad->irq); goto err_clk_disable; } error = input_register_device(input); if (error) { dev_err(&pdev->dev, "unable to register input device: %d\n", error); goto err_free_irq; } if (plat->wakeup_enable) device_init_wakeup(&pdev->dev, true); platform_set_drvdata(pdev, keypad); return 0; err_free_irq: free_irq(keypad->irq, keypad); err_clk_disable: clk_disable_unprepare(keypad->clk); err_pclk_disable: clk_disable_unprepare(keypad->pclk); err_clk: clk_put(keypad->clk); err_pclk: clk_put(keypad->pclk); err_iounmap: iounmap(keypad->reg_base); err_free_mem_region: release_mem_region(res->start, resource_size(res)); err_free_mem: input_free_device(input); kfree(keypad); return error; }

Contributors

PersonTokensPropCommitsCommitProp
Sundar R Iyer59579.55%116.67%
Ulf Hansson12016.04%233.33%
Dmitry Torokhov293.88%233.33%
Jingoo Han40.53%116.67%
Total748100.00%6100.00%


static int ske_keypad_remove(struct platform_device *pdev) { struct ske_keypad *keypad = platform_get_drvdata(pdev); struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); free_irq(keypad->irq, keypad); input_unregister_device(keypad->input); clk_disable_unprepare(keypad->clk); clk_put(keypad->clk); if (keypad->board->exit) keypad->board->exit(); iounmap(keypad->reg_base); release_mem_region(res->start, resource_size(res)); kfree(keypad); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sundar R Iyer10699.07%150.00%
Ulf Hansson10.93%150.00%
Total107100.00%2100.00%

#ifdef CONFIG_PM_SLEEP
static int ske_keypad_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct ske_keypad *keypad = platform_get_drvdata(pdev); int irq = platform_get_irq(pdev, 0); if (device_may_wakeup(dev)) enable_irq_wake(irq); else ske_keypad_set_bits(keypad, SKE_IMSC, ~SKE_KPIMA, 0x0); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sundar R Iyer69100.00%1100.00%
Total69100.00%1100.00%


static int ske_keypad_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct ske_keypad *keypad = platform_get_drvdata(pdev); int irq = platform_get_irq(pdev, 0); if (device_may_wakeup(dev)) disable_irq_wake(irq); else ske_keypad_set_bits(keypad, SKE_IMSC, 0x0, SKE_KPIMA); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sundar R Iyer68100.00%1100.00%
Total68100.00%1100.00%

#endif static SIMPLE_DEV_PM_OPS(ske_keypad_dev_pm_ops, ske_keypad_suspend, ske_keypad_resume); static struct platform_driver ske_keypad_driver = { .driver = { .name = "nmk-ske-keypad", .pm = &ske_keypad_dev_pm_ops, }, .remove = ske_keypad_remove, }; module_platform_driver_probe(ske_keypad_driver, ske_keypad_probe); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Naveen Kumar <naveen.gaddipati@stericsson.com> / Sundar Iyer <sundar.iyer@stericsson.com>"); MODULE_DESCRIPTION("Nomadik Scroll-Key-Encoder Keypad Driver"); MODULE_ALIAS("platform:nomadik-ske-keypad");

Overall Contributors

PersonTokensPropCommitsCommitProp
Sundar R Iyer146878.71%16.67%
Naveen Kumar Gaddipati20310.88%213.33%
Ulf Hansson1266.76%213.33%
Dmitry Torokhov573.06%426.67%
Jingoo Han40.21%16.67%
Paul Gortmaker30.16%16.67%
Axel Lin10.05%16.67%
Arnd Bergmann10.05%16.67%
Geliang Tang10.05%16.67%
Sachin Kamat10.05%16.67%
Total1865100.00%15100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.