diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-20 10:17:02 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-20 10:17:02 -0700 |
commit | 93db6294958f62643a917e44d1abc85440e600cf (patch) | |
tree | 33de2c41b0f70d209d64487d1a2bba6d673015ef /drivers/input/keyboard/ep93xx_keypad.c | |
parent | 43813f399c72aa22e01a680559c1cb5274bf2140 (diff) | |
parent | eef3e4cab72eaf5345e3c73b2975c194a714f6cd (diff) |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: (35 commits)
Input: add driver for Synaptics I2C touchpad
Input: synaptics - add support for reporting x/y resolution
Input: ALPS - handle touchpoints buttons correctly
Input: gpio-keys - change timer to workqueue
Input: ads7846 - pin change interrupt support
Input: add support for touchscreen on W90P910 ARM platform
Input: appletouch - improve finger detection
Input: wacom - clear Intuos4 wheel data when finger leaves proximity
Input: ucb1400 - move static function from header into core
Input: add driver for EETI touchpanels
Input: ads7846 - more detailed model name in sysfs
Input: ads7846 - support swapping x and y axes
Input: ati_remote2 - use non-atomic bitops
Input: introduce lm8323 keypad driver
Input: psmouse - ESD workaround fix for OLPC XO touchpad
Input: tsc2007 - make sure platform provides get_pendown_state()
Input: uinput - flush all pending ff effects before destroying device
Input: simplify name handling for certain input handles
Input: serio - do not use deprecated dev.power.power_state
Input: wacom - add support for Intuos4 tablets
...
Diffstat (limited to 'drivers/input/keyboard/ep93xx_keypad.c')
-rw-r--r-- | drivers/input/keyboard/ep93xx_keypad.c | 470 |
1 files changed, 470 insertions, 0 deletions
diff --git a/drivers/input/keyboard/ep93xx_keypad.c b/drivers/input/keyboard/ep93xx_keypad.c new file mode 100644 index 00000000000..181d30e3018 --- /dev/null +++ b/drivers/input/keyboard/ep93xx_keypad.c @@ -0,0 +1,470 @@ +/* + * Driver for the Cirrus EP93xx matrix keypad controller. + * + * Copyright (c) 2008 H Hartley Sweeten <hsweeten@visionengravers.com> + * + * Based on the pxa27x matrix keypad controller by Rodolfo Giometti. + * + * 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. + * + * NOTE: + * + * The 3-key reset is triggered by pressing the 3 keys in + * Row 0, Columns 2, 4, and 7 at the same time. This action can + * be disabled by setting the EP93XX_KEYPAD_DISABLE_3_KEY flag. + * + * Normal operation for the matrix does not autorepeat the key press. + * This action can be enabled by setting the EP93XX_KEYPAD_AUTOREPEAT + * flag. + */ + +#include <linux/platform_device.h> +#include <linux/interrupt.h> +#include <linux/input.h> +#include <linux/clk.h> + +#include <mach/hardware.h> +#include <mach/gpio.h> +#include <mach/ep93xx_keypad.h> + +/* + * Keypad Interface Register offsets + */ +#define KEY_INIT 0x00 /* Key Scan Initialization register */ +#define KEY_DIAG 0x04 /* Key Scan Diagnostic register */ +#define KEY_REG 0x08 /* Key Value Capture register */ + +/* Key Scan Initialization Register bit defines */ +#define KEY_INIT_DBNC_MASK (0x00ff0000) +#define KEY_INIT_DBNC_SHIFT (16) +#define KEY_INIT_DIS3KY (1<<15) +#define KEY_INIT_DIAG (1<<14) +#define KEY_INIT_BACK (1<<13) +#define KEY_INIT_T2 (1<<12) +#define KEY_INIT_PRSCL_MASK (0x000003ff) +#define KEY_INIT_PRSCL_SHIFT (0) + +/* Key Scan Diagnostic Register bit defines */ +#define KEY_DIAG_MASK (0x0000003f) +#define KEY_DIAG_SHIFT (0) + +/* Key Value Capture Register bit defines */ +#define KEY_REG_K (1<<15) +#define KEY_REG_INT (1<<14) +#define KEY_REG_2KEYS (1<<13) +#define KEY_REG_1KEY (1<<12) +#define KEY_REG_KEY2_MASK (0x00000fc0) +#define KEY_REG_KEY2_SHIFT (6) +#define KEY_REG_KEY1_MASK (0x0000003f) +#define KEY_REG_KEY1_SHIFT (0) + +#define keypad_readl(off) __raw_readl(keypad->mmio_base + (off)) +#define keypad_writel(v, off) __raw_writel((v), keypad->mmio_base + (off)) + +#define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS) + +struct ep93xx_keypad { + struct ep93xx_keypad_platform_data *pdata; + + struct clk *clk; + struct input_dev *input_dev; + void __iomem *mmio_base; + + int irq; + int enabled; + + int key1; + int key2; + + unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM]; +}; + +static void ep93xx_keypad_build_keycode(struct ep93xx_keypad *keypad) +{ + struct ep93xx_keypad_platform_data *pdata = keypad->pdata; + struct input_dev *input_dev = keypad->input_dev; + int i; + + for (i = 0; i < pdata->matrix_key_map_size; i++) { + unsigned int key = pdata->matrix_key_map[i]; + int row = (key >> 28) & 0xf; + int col = (key >> 24) & 0xf; + int code = key & 0xffffff; + + keypad->matrix_keycodes[(row << 3) + col] = code; + __set_bit(code, input_dev->keybit); + } +} + +static irqreturn_t ep93xx_keypad_irq_handler(int irq, void *dev_id) +{ + struct ep93xx_keypad *keypad = dev_id; + struct input_dev *input_dev = keypad->input_dev; + unsigned int status = keypad_readl(KEY_REG); + int keycode, key1, key2; + + keycode = (status & KEY_REG_KEY1_MASK) >> KEY_REG_KEY1_SHIFT; + key1 = keypad->matrix_keycodes[keycode]; + + keycode = (status & KEY_REG_KEY2_MASK) >> KEY_REG_KEY2_SHIFT; + key2 = keypad->matrix_keycodes[keycode]; + + if (status & KEY_REG_2KEYS) { + if (keypad->key1 && key1 != keypad->key1 && key2 != keypad->key1) + input_report_key(input_dev, keypad->key1, 0); + + if (keypad->key2 && key1 != keypad->key2 && key2 != keypad->key2) + input_report_key(input_dev, keypad->key2, 0); + + input_report_key(input_dev, key1, 1); + input_report_key(input_dev, key2, 1); + + keypad->key1 = key1; + keypad->key2 = key2; + + } else if (status & KEY_REG_1KEY) { + if (keypad->key1 && key1 != keypad->key1) + input_report_key(input_dev, keypad->key1, 0); + + if (keypad->key2 && key1 != keypad->key2) + input_report_key(input_dev, keypad->key2, 0); + + input_report_key(input_dev, key1, 1); + + keypad->key1 = key1; + keypad->key2 = 0; + + } else { + input_report_key(input_dev, keypad->key1, 0); + input_report_key(input_dev, keypad->key2, 0); + + keypad->key1 = keypad->key2 = 0; + } + input_sync(input_dev); + + return IRQ_HANDLED; +} + +static void ep93xx_keypad_config(struct ep93xx_keypad *keypad) +{ + struct ep93xx_keypad_platform_data *pdata = keypad->pdata; + unsigned int val = 0; + + clk_set_rate(keypad->clk, pdata->flags & EP93XX_KEYPAD_KDIV); + + if (pdata->flags & EP93XX_KEYPAD_DISABLE_3_KEY) + val |= KEY_INIT_DIS3KY; + if (pdata->flags & EP93XX_KEYPAD_DIAG_MODE) + val |= KEY_INIT_DIAG; + if (pdata->flags & EP93XX_KEYPAD_BACK_DRIVE) + val |= KEY_INIT_BACK; + if (pdata->flags & EP93XX_KEYPAD_TEST_MODE) + val |= KEY_INIT_T2; + + val |= ((pdata->debounce << KEY_INIT_DBNC_SHIFT) & KEY_INIT_DBNC_MASK); + + val |= ((pdata->prescale << KEY_INIT_PRSCL_SHIFT) & KEY_INIT_PRSCL_MASK); + + keypad_writel(val, KEY_INIT); +} + +static int ep93xx_keypad_open(struct input_dev *pdev) +{ + struct ep93xx_keypad *keypad = input_get_drvdata(pdev); + + if (!keypad->enabled) { + ep93xx_keypad_config(keypad); + clk_enable(keypad->clk); + keypad->enabled = 1; + } + + return 0; +} + +static void ep93xx_keypad_close(struct input_dev *pdev) +{ + struct ep93xx_keypad *keypad = input_get_drvdata(pdev); + + if (keypad->enabled) { + clk_disable(keypad->clk); + keypad->enabled = 0; + } +} + + +#ifdef CONFIG_PM +/* + * NOTE: I don't know if this is correct, or will work on the ep93xx. + * + * None of the existing ep93xx drivers have power management support. + * But, this is basically what the pxa27x_keypad driver does. + */ +static int ep93xx_keypad_suspend(struct platform_device *pdev, + pm_message_t state) +{ + struct ep93xx_keypad *keypad = platform_get_drvdata(pdev); + struct input_dev *input_dev = keypad->input_dev; + + mutex_lock(&input_dev->mutex); + + if (keypad->enabled) { + clk_disable(keypad->clk); + keypad->enabled = 0; + } + + mutex_unlock(&input_dev->mutex); + + if (device_may_wakeup(&pdev->dev)) + enable_irq_wake(keypad->irq); + + return 0; +} + +static int ep93xx_keypad_resume(struct platform_device *pdev) +{ + struct ep93xx_keypad *keypad = platform_get_drvdata(pdev); + struct input_dev *input_dev = keypad->input_dev; + + if (device_may_wakeup(&pdev->dev)) + disable_irq_wake(keypad->irq); + + mutex_lock(&input_dev->mutex); + + if (input_dev->users) { + if (!keypad->enabled) { + ep93xx_keypad_config(keypad); + clk_enable(keypad->clk); + keypad->enabled = 1; + } + } + + mutex_unlock(&input_dev->mutex); + + return 0; +} +#else /* !CONFIG_PM */ +#define ep93xx_keypad_suspend NULL +#define ep93xx_keypad_resume NULL +#endif /* !CONFIG_PM */ + +static int __devinit ep93xx_keypad_probe(struct platform_device *pdev) +{ + struct ep93xx_keypad *keypad; + struct ep93xx_keypad_platform_data *pdata = pdev->dev.platform_data; + struct input_dev *input_dev; + struct resource *res; + int irq, err, i, gpio; + + if (!pdata || + !pdata->matrix_key_rows || + pdata->matrix_key_rows > MAX_MATRIX_KEY_ROWS || + !pdata->matrix_key_cols || + pdata->matrix_key_cols > MAX_MATRIX_KEY_COLS) { + dev_err(&pdev->dev, "invalid or missing platform data\n"); + return -EINVAL; + } + + keypad = kzalloc(sizeof(struct ep93xx_keypad), GFP_KERNEL); + if (!keypad) { + dev_err(&pdev->dev, "failed to allocate driver data\n"); + return -ENOMEM; + } + + keypad->pdata = pdata; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "failed to get keypad irq\n"); + err = -ENXIO; + goto failed_free; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "failed to get I/O memory\n"); + err = -ENXIO; + goto failed_free; + } + + res = request_mem_region(res->start, resource_size(res), pdev->name); + if (!res) { + dev_err(&pdev->dev, "failed to request I/O memory\n"); + err = -EBUSY; + goto failed_free; + } + + keypad->mmio_base = ioremap(res->start, resource_size(res)); + if (keypad->mmio_base == NULL) { + dev_err(&pdev->dev, "failed to remap I/O memory\n"); + err = -ENXIO; + goto failed_free_mem; + } + + /* Request the needed GPIO's */ + gpio = EP93XX_GPIO_LINE_ROW0; + for (i = 0; i < keypad->pdata->matrix_key_rows; i++, gpio++) { + err = gpio_request(gpio, pdev->name); + if (err) { + dev_err(&pdev->dev, "failed to request gpio-%d\n", + gpio); + goto failed_free_rows; + } + } + + gpio = EP93XX_GPIO_LINE_COL0; + for (i = 0; i < keypad->pdata->matrix_key_cols; i++, gpio++) { + err = gpio_request(gpio, pdev->name); + if (err) { + dev_err(&pdev->dev, "failed to request gpio-%d\n", + gpio); + goto failed_free_cols; + } + } + + keypad->clk = clk_get(&pdev->dev, "key_clk"); + if (IS_ERR(keypad->clk)) { + dev_err(&pdev->dev, "failed to get keypad clock\n"); + err = PTR_ERR(keypad->clk); + goto failed_free_io; + } + + /* Create and register the input driver */ + input_dev = input_allocate_device(); + if (!input_dev) { + dev_err(&pdev->dev, "failed to allocate input device\n"); + err = -ENOMEM; + goto failed_put_clk; + } + + keypad->input_dev = input_dev; + + input_dev->name = pdev->name; + input_dev->id.bustype = BUS_HOST; + input_dev->open = ep93xx_keypad_open; + input_dev->close = ep93xx_keypad_close; + input_dev->dev.parent = &pdev->dev; + input_dev->keycode = keypad->matrix_keycodes; + input_dev->keycodesize = sizeof(keypad->matrix_keycodes[0]); + input_dev->keycodemax = ARRAY_SIZE(keypad->matrix_keycodes); + + input_set_drvdata(input_dev, keypad); + + input_dev->evbit[0] = BIT_MASK(EV_KEY); + if (keypad->pdata->flags & EP93XX_KEYPAD_AUTOREPEAT) + input_dev->evbit[0] |= BIT_MASK(EV_REP); + + ep93xx_keypad_build_keycode(keypad); + platform_set_drvdata(pdev, keypad); + + err = request_irq(irq, ep93xx_keypad_irq_handler, IRQF_DISABLED, + pdev->name, keypad); + if (err) { + dev_err(&pdev->dev, "failed to request IRQ\n"); + goto failed_free_dev; + } + + keypad->irq = irq; + + /* Register the input device */ + err = input_register_device(input_dev); + if (err) { + dev_err(&pdev->dev, "failed to register input device\n"); + goto failed_free_irq; + } + + device_init_wakeup(&pdev->dev, 1); + + return 0; + +failed_free_irq: + free_irq(irq, pdev); + platform_set_drvdata(pdev, NULL); +failed_free_dev: + input_free_device(input_dev); +failed_put_clk: + clk_put(keypad->clk); +failed_free_io: + i = keypad->pdata->matrix_key_cols - 1; + gpio = EP93XX_GPIO_LINE_COL0 + i; +failed_free_cols: + for ( ; i >= 0; i--, gpio--) + gpio_free(gpio); + i = keypad->pdata->matrix_key_rows - 1; + gpio = EP93XX_GPIO_LINE_ROW0 + i; +failed_free_rows: + for ( ; i >= 0; i--, gpio--) + gpio_free(gpio); + iounmap(keypad->mmio_base); +failed_free_mem: + release_mem_region(res->start, resource_size(res)); +failed_free: + kfree(keypad); + return err; +} + +static int __devexit ep93xx_keypad_remove(struct platform_device *pdev) +{ + struct ep93xx_keypad *keypad = platform_get_drvdata(pdev); + struct resource *res; + int i, gpio; + + free_irq(keypad->irq, pdev); + + platform_set_drvdata(pdev, NULL); + + if (keypad->enabled) + clk_disable(keypad->clk); + clk_put(keypad->clk); + + input_unregister_device(keypad->input_dev); + + i = keypad->pdata->matrix_key_cols - 1; + gpio = EP93XX_GPIO_LINE_COL0 + i; + for ( ; i >= 0; i--, gpio--) + gpio_free(gpio); + + i = keypad->pdata->matrix_key_rows - 1; + gpio = EP93XX_GPIO_LINE_ROW0 + i; + for ( ; i >= 0; i--, gpio--) + gpio_free(gpio); + + iounmap(keypad->mmio_base); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + release_mem_region(res->start, resource_size(res)); + + kfree(keypad); + + return 0; +} + +static struct platform_driver ep93xx_keypad_driver = { + .driver = { + .name = "ep93xx-keypad", + .owner = THIS_MODULE, + }, + .probe = ep93xx_keypad_probe, + .remove = __devexit_p(ep93xx_keypad_remove), + .suspend = ep93xx_keypad_suspend, + .resume = ep93xx_keypad_resume, +}; + +static int __init ep93xx_keypad_init(void) +{ + return platform_driver_register(&ep93xx_keypad_driver); +} + +static void __exit ep93xx_keypad_exit(void) +{ + platform_driver_unregister(&ep93xx_keypad_driver); +} + +module_init(ep93xx_keypad_init); +module_exit(ep93xx_keypad_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>"); +MODULE_DESCRIPTION("EP93xx Matrix Keypad Controller"); +MODULE_ALIAS("platform:ep93xx-keypad"); |