From 70614084402ae40aef40019b991bf44d10093122 Mon Sep 17 00:00:00 2001 From: Cyril Chemparathy Date: Mon, 20 Sep 2010 12:26:40 -0400 Subject: [PATCH] input: add driver for tnetv107x on-chip keypad controller This patch adds support for tnetv107x's on-chip keypad controller. Signed-off-by: Cyril Chemparathy Acked-by: Dmitry Torokhov Signed-off-by: Kevin Hilman --- drivers/input/keyboard/Kconfig | 9 + drivers/input/keyboard/Makefile | 1 + drivers/input/keyboard/tnetv107x-keypad.c | 340 ++++++++++++++++++++++ 3 files changed, 350 insertions(+) create mode 100644 drivers/input/keyboard/tnetv107x-keypad.c diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index 9cc488d21490..df1facb0386a 100644 --- a/drivers/input/keyboard/Kconfig +++ b/drivers/input/keyboard/Kconfig @@ -424,6 +424,15 @@ config KEYBOARD_OMAP To compile this driver as a module, choose M here: the module will be called omap-keypad. +config KEYBOARD_TNETV107X + tristate "TI TNETV107X keypad support" + depends on ARCH_DAVINCI_TNETV107X + help + Say Y here if you want to use the TNETV107X keypad. + + To compile this driver as a module, choose M here: the + module will be called tnetv107x-keypad. + config KEYBOARD_TWL4030 tristate "TI TWL4030/TWL5030/TPS659x0 keypad support" depends on TWL4030_CORE diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile index 504b591be0cd..dc0451824dbf 100644 --- a/drivers/input/keyboard/Makefile +++ b/drivers/input/keyboard/Makefile @@ -38,6 +38,7 @@ obj-$(CONFIG_KEYBOARD_SH_KEYSC) += sh_keysc.o obj-$(CONFIG_KEYBOARD_STMPE) += stmpe-keypad.o obj-$(CONFIG_KEYBOARD_STOWAWAY) += stowaway.o obj-$(CONFIG_KEYBOARD_SUNKBD) += sunkbd.o +obj-$(CONFIG_KEYBOARD_TNETV107X) += tnetv107x-keypad.o obj-$(CONFIG_KEYBOARD_TWL4030) += twl4030_keypad.o obj-$(CONFIG_KEYBOARD_XTKBD) += xtkbd.o obj-$(CONFIG_KEYBOARD_W90P910) += w90p910_keypad.o diff --git a/drivers/input/keyboard/tnetv107x-keypad.c b/drivers/input/keyboard/tnetv107x-keypad.c new file mode 100644 index 000000000000..b4a81ebfab92 --- /dev/null +++ b/drivers/input/keyboard/tnetv107x-keypad.c @@ -0,0 +1,340 @@ +/* + * Texas Instruments TNETV107X Keypad Driver + * + * Copyright (C) 2010 Texas Instruments + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define BITS(x) (BIT(x) - 1) + +#define KEYPAD_ROWS 9 +#define KEYPAD_COLS 9 + +#define DEBOUNCE_MIN 0x400ul +#define DEBOUNCE_MAX 0x3ffffffful + +struct keypad_regs { + u32 rev; + u32 mode; + u32 mask; + u32 pol; + u32 dclock; + u32 rclock; + u32 stable_cnt; + u32 in_en; + u32 out; + u32 out_en; + u32 in; + u32 lock; + u32 pres[3]; +}; + +#define keypad_read(kp, reg) __raw_readl(&(kp)->regs->reg) +#define keypad_write(kp, reg, val) __raw_writel(val, &(kp)->regs->reg) + +struct keypad_data { + struct input_dev *input_dev; + struct resource *res; + struct keypad_regs __iomem *regs; + struct clk *clk; + struct device *dev; + spinlock_t lock; + u32 irq_press; + u32 irq_release; + int rows, cols, row_shift; + int debounce_ms, active_low; + u32 prev_keys[3]; + unsigned short keycodes[]; +}; + +static irqreturn_t keypad_irq(int irq, void *data) +{ + struct keypad_data *kp = data; + int i, bit, val, row, col, code; + unsigned long flags; + u32 curr_keys[3]; + u32 change; + + spin_lock_irqsave(&kp->lock, flags); + + memset(curr_keys, 0, sizeof(curr_keys)); + if (irq == kp->irq_press) + for (i = 0; i < 3; i++) + curr_keys[i] = keypad_read(kp, pres[i]); + + for (i = 0; i < 3; i++) { + change = curr_keys[i] ^ kp->prev_keys[i]; + + while (change) { + bit = fls(change) - 1; + change ^= BIT(bit); + val = curr_keys[i] & BIT(bit); + bit += i * 32; + row = bit / KEYPAD_COLS; + col = bit % KEYPAD_COLS; + + code = MATRIX_SCAN_CODE(row, col, kp->row_shift); + input_event(kp->input_dev, EV_MSC, MSC_SCAN, code); + input_report_key(kp->input_dev, kp->keycodes[code], + val); + } + } + input_sync(kp->input_dev); + memcpy(kp->prev_keys, curr_keys, sizeof(curr_keys)); + + if (irq == kp->irq_press) + keypad_write(kp, lock, 0); /* Allow hardware updates */ + + spin_unlock_irqrestore(&kp->lock, flags); + + return IRQ_HANDLED; +} + +static int keypad_start(struct input_dev *dev) +{ + struct keypad_data *kp = input_get_drvdata(dev); + unsigned long mask, debounce, clk_rate_khz; + unsigned long flags; + + clk_enable(kp->clk); + clk_rate_khz = clk_get_rate(kp->clk) / 1000; + + spin_lock_irqsave(&kp->lock, flags); + + /* Initialize device registers */ + keypad_write(kp, mode, 0); + + mask = BITS(kp->rows) << KEYPAD_COLS; + mask |= BITS(kp->cols); + keypad_write(kp, mask, ~mask); + + keypad_write(kp, pol, kp->active_low ? 0 : 0x3ffff); + keypad_write(kp, stable_cnt, 3); + + debounce = kp->debounce_ms * clk_rate_khz; + debounce = clamp(debounce, DEBOUNCE_MIN, DEBOUNCE_MAX); + keypad_write(kp, dclock, debounce); + keypad_write(kp, rclock, 4 * debounce); + + keypad_write(kp, in_en, 1); + + spin_unlock_irqrestore(&kp->lock, flags); + + return 0; +} + +static void keypad_stop(struct input_dev *dev) +{ + struct keypad_data *kp = input_get_drvdata(dev); + + synchronize_irq(kp->irq_press); + synchronize_irq(kp->irq_release); + clk_disable(kp->clk); +} + +static int __devinit keypad_probe(struct platform_device *pdev) +{ + const struct matrix_keypad_platform_data *pdata; + const struct matrix_keymap_data *keymap_data; + struct device *dev = &pdev->dev; + struct keypad_data *kp; + int error = 0, sz, row_shift; + u32 rev = 0; + + pdata = pdev->dev.platform_data; + if (!pdata) { + dev_err(dev, "cannot find device data\n"); + return -EINVAL; + } + + keymap_data = pdata->keymap_data; + if (!keymap_data) { + dev_err(dev, "cannot find keymap data\n"); + return -EINVAL; + } + + row_shift = get_count_order(pdata->num_col_gpios); + sz = offsetof(struct keypad_data, keycodes); + sz += (pdata->num_row_gpios << row_shift) * sizeof(kp->keycodes[0]); + kp = kzalloc(sz, GFP_KERNEL); + if (!kp) { + dev_err(dev, "cannot allocate device info\n"); + return -ENOMEM; + } + + kp->dev = dev; + kp->rows = pdata->num_row_gpios; + kp->cols = pdata->num_col_gpios; + kp->row_shift = row_shift; + platform_set_drvdata(pdev, kp); + spin_lock_init(&kp->lock); + + kp->irq_press = platform_get_irq_byname(pdev, "press"); + kp->irq_release = platform_get_irq_byname(pdev, "release"); + if (kp->irq_press < 0 || kp->irq_release < 0) { + dev_err(dev, "cannot determine device interrupts\n"); + error = -ENODEV; + goto error_res; + } + + kp->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!kp->res) { + dev_err(dev, "cannot determine register area\n"); + error = -ENODEV; + goto error_res; + } + + if (!request_mem_region(kp->res->start, resource_size(kp->res), + pdev->name)) { + dev_err(dev, "cannot claim register memory\n"); + kp->res = NULL; + error = -EINVAL; + goto error_res; + } + + kp->regs = ioremap(kp->res->start, resource_size(kp->res)); + if (!kp->regs) { + dev_err(dev, "cannot map register memory\n"); + error = -ENOMEM; + goto error_map; + } + + kp->clk = clk_get(dev, NULL); + if (!kp->clk) { + dev_err(dev, "cannot claim device clock\n"); + error = -EINVAL; + goto error_clk; + } + + error = request_threaded_irq(kp->irq_press, NULL, keypad_irq, 0, + dev_name(dev), kp); + if (error < 0) { + dev_err(kp->dev, "Could not allocate keypad press key irq\n"); + goto error_irq_press; + } + + error = request_threaded_irq(kp->irq_release, NULL, keypad_irq, 0, + dev_name(dev), kp); + if (error < 0) { + dev_err(kp->dev, "Could not allocate keypad release key irq\n"); + goto error_irq_release; + } + + kp->input_dev = input_allocate_device(); + if (!kp->input_dev) { + dev_err(dev, "cannot allocate input device\n"); + error = -ENOMEM; + goto error_input; + } + input_set_drvdata(kp->input_dev, kp); + + kp->input_dev->name = pdev->name; + kp->input_dev->dev.parent = &pdev->dev; + kp->input_dev->open = keypad_start; + kp->input_dev->close = keypad_stop; + kp->input_dev->evbit[0] = BIT_MASK(EV_KEY); + if (!pdata->no_autorepeat) + kp->input_dev->evbit[0] |= BIT_MASK(EV_REP); + + clk_enable(kp->clk); + rev = keypad_read(kp, rev); + kp->input_dev->id.bustype = BUS_HOST; + kp->input_dev->id.product = ((rev >> 8) & 0x07); + kp->input_dev->id.version = ((rev >> 16) & 0xfff); + clk_disable(kp->clk); + + kp->input_dev->keycode = kp->keycodes; + kp->input_dev->keycodesize = sizeof(kp->keycodes[0]); + kp->input_dev->keycodemax = kp->rows << kp->row_shift; + + matrix_keypad_build_keymap(keymap_data, kp->row_shift, kp->keycodes, + kp->input_dev->keybit); + + input_set_capability(kp->input_dev, EV_MSC, MSC_SCAN); + + error = input_register_device(kp->input_dev); + if (error < 0) { + dev_err(dev, "Could not register input device\n"); + goto error_reg; + } + + return 0; + + +error_reg: + input_free_device(kp->input_dev); +error_input: + free_irq(kp->irq_release, kp); +error_irq_release: + free_irq(kp->irq_press, kp); +error_irq_press: + clk_put(kp->clk); +error_clk: + iounmap(kp->regs); +error_map: + release_mem_region(kp->res->start, resource_size(kp->res)); +error_res: + platform_set_drvdata(pdev, NULL); + kfree(kp); + return error; +} + +static int __devexit keypad_remove(struct platform_device *pdev) +{ + struct keypad_data *kp = platform_get_drvdata(pdev); + + free_irq(kp->irq_press, kp); + free_irq(kp->irq_release, kp); + input_unregister_device(kp->input_dev); + clk_put(kp->clk); + iounmap(kp->regs); + release_mem_region(kp->res->start, resource_size(kp->res)); + platform_set_drvdata(pdev, NULL); + kfree(kp); + + return 0; +} + +static struct platform_driver keypad_driver = { + .probe = keypad_probe, + .remove = __devexit_p(keypad_remove), + .driver.name = "tnetv107x-keypad", + .driver.owner = THIS_MODULE, +}; + +static int __init keypad_init(void) +{ + return platform_driver_register(&keypad_driver); +} + +static void __exit keypad_exit(void) +{ + platform_driver_unregister(&keypad_driver); +} + +module_init(keypad_init); +module_exit(keypad_exit); + +MODULE_AUTHOR("Cyril Chemparathy"); +MODULE_DESCRIPTION("TNETV107X Keypad Driver"); +MODULE_ALIAS("platform: tnetv107x-keypad"); +MODULE_LICENSE("GPL"); -- GitLab