diff options
Diffstat (limited to 'drivers/input/keyboard/bf54x-keys.c')
| -rw-r--r-- | drivers/input/keyboard/bf54x-keys.c | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/drivers/input/keyboard/bf54x-keys.c b/drivers/input/keyboard/bf54x-keys.c new file mode 100644 index 0000000..1928401 --- /dev/null +++ b/drivers/input/keyboard/bf54x-keys.c @@ -0,0 +1,421 @@ +/* + * File: drivers/input/keyboard/bf54x-keys.c + * Based on: + * Author: Michael Hennerich <hennerich@blackfin.uclinux.org> + * + * Created: + * Description: keypad driver for Analog Devices Blackfin BF54x Processors + * + * + * Modified: + * Copyright 2007-2008 Analog Devices Inc. + * + * Bugs: Enter bugs at http://blackfin.uclinux.org/ + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see the file COPYING, or write + * to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <linux/module.h> + +#include <linux/init.h> +#include <linux/fs.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/sched.h> +#include <linux/pm.h> +#include <linux/sysctl.h> +#include <linux/proc_fs.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/input.h> + +#include <asm/portmux.h> +#include <mach/bf54x_keys.h> + +#define DRV_NAME "bf54x-keys" +#define TIME_SCALE 100 /* 100 ns */ +#define MAX_MULT (0xFF * TIME_SCALE) +#define MAX_RC 8 /* Max Row/Col */ + +static const u16 per_rows[] = { + P_KEY_ROW7, + P_KEY_ROW6, + P_KEY_ROW5, + P_KEY_ROW4, + P_KEY_ROW3, + P_KEY_ROW2, + P_KEY_ROW1, + P_KEY_ROW0, + 0 +}; + +static const u16 per_cols[] = { + P_KEY_COL7, + P_KEY_COL6, + P_KEY_COL5, + P_KEY_COL4, + P_KEY_COL3, + P_KEY_COL2, + P_KEY_COL1, + P_KEY_COL0, + 0 +}; + +struct bf54x_kpad { + struct input_dev *input; + int irq; + unsigned short lastkey; + unsigned short *keycode; + struct timer_list timer; + unsigned int keyup_test_jiffies; + unsigned short kpad_msel; + unsigned short kpad_prescale; + unsigned short kpad_ctl; +}; + +static inline int bfin_kpad_find_key(struct bf54x_kpad *bf54x_kpad, + struct input_dev *input, u16 keyident) +{ + u16 i; + + for (i = 0; i < input->keycodemax; i++) + if (bf54x_kpad->keycode[i + input->keycodemax] == keyident) + return bf54x_kpad->keycode[i]; + return -1; +} + +static inline void bfin_keycodecpy(unsigned short *keycode, + const unsigned int *pdata_kc, + unsigned short keymapsize) +{ + unsigned int i; + + for (i = 0; i < keymapsize; i++) { + keycode[i] = pdata_kc[i] & 0xffff; + keycode[i + keymapsize] = pdata_kc[i] >> 16; + } +} + +static inline u16 bfin_kpad_get_prescale(u32 timescale) +{ + u32 sclk = get_sclk(); + + return ((((sclk / 1000) * timescale) / 1024) - 1); +} + +static inline u16 bfin_kpad_get_keypressed(struct bf54x_kpad *bf54x_kpad) +{ + return (bfin_read_KPAD_STAT() & KPAD_PRESSED); +} + +static inline void bfin_kpad_clear_irq(void) +{ + bfin_write_KPAD_STAT(0xFFFF); + bfin_write_KPAD_ROWCOL(0xFFFF); +} + +static void bfin_kpad_timer(unsigned long data) +{ + struct platform_device *pdev = (struct platform_device *) data; + struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev); + + if (bfin_kpad_get_keypressed(bf54x_kpad)) { + /* Try again later */ + mod_timer(&bf54x_kpad->timer, + jiffies + bf54x_kpad->keyup_test_jiffies); + return; + } + + input_report_key(bf54x_kpad->input, bf54x_kpad->lastkey, 0); + input_sync(bf54x_kpad->input); + + /* Clear IRQ Status */ + + bfin_kpad_clear_irq(); + enable_irq(bf54x_kpad->irq); +} + +static irqreturn_t bfin_kpad_isr(int irq, void *dev_id) +{ + struct platform_device *pdev = dev_id; + struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev); + struct input_dev *input = bf54x_kpad->input; + int key; + u16 rowcol = bfin_read_KPAD_ROWCOL(); + + key = bfin_kpad_find_key(bf54x_kpad, input, rowcol); + + input_report_key(input, key, 1); + input_sync(input); + + if (bfin_kpad_get_keypressed(bf54x_kpad)) { + disable_irq(bf54x_kpad->irq); + bf54x_kpad->lastkey = key; + mod_timer(&bf54x_kpad->timer, + jiffies + bf54x_kpad->keyup_test_jiffies); + } else { + input_report_key(input, key, 0); + input_sync(input); + + bfin_kpad_clear_irq(); + } + + return IRQ_HANDLED; +} + +static int __devinit bfin_kpad_probe(struct platform_device *pdev) +{ + struct bf54x_kpad *bf54x_kpad; + struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data; + struct input_dev *input; + int i, error; + + if (!pdata->rows || !pdata->cols || !pdata->keymap) { + printk(KERN_ERR DRV_NAME + ": No rows, cols or keymap from pdata\n"); + return -EINVAL; + } + + if (!pdata->keymapsize || + pdata->keymapsize > (pdata->rows * pdata->cols)) { + printk(KERN_ERR DRV_NAME ": Invalid keymapsize\n"); + return -EINVAL; + } + + bf54x_kpad = kzalloc(sizeof(struct bf54x_kpad), GFP_KERNEL); + if (!bf54x_kpad) + return -ENOMEM; + + platform_set_drvdata(pdev, bf54x_kpad); + + /* Allocate memory for keymap followed by private LUT */ + bf54x_kpad->keycode = kmalloc(pdata->keymapsize * + sizeof(unsigned short) * 2, GFP_KERNEL); + if (!bf54x_kpad->keycode) { + error = -ENOMEM; + goto out; + } + + if (!pdata->debounce_time || !pdata->debounce_time > MAX_MULT || + !pdata->coldrive_time || !pdata->coldrive_time > MAX_MULT) { + printk(KERN_ERR DRV_NAME + ": Invalid Debounce/Columdrive Time from pdata\n"); + bfin_write_KPAD_MSEL(0xFF0); /* Default MSEL */ + } else { + bfin_write_KPAD_MSEL( + ((pdata->debounce_time / TIME_SCALE) + & DBON_SCALE) | + (((pdata->coldrive_time / TIME_SCALE) << 8) + & COLDRV_SCALE)); + + } + + if (!pdata->keyup_test_interval) + bf54x_kpad->keyup_test_jiffies = msecs_to_jiffies(50); + else + bf54x_kpad->keyup_test_jiffies = + msecs_to_jiffies(pdata->keyup_test_interval); + + if (peripheral_request_list((u16 *)&per_rows[MAX_RC - pdata->rows], + DRV_NAME)) { + printk(KERN_ERR DRV_NAME + ": Requesting Peripherals failed\n"); + error = -EFAULT; + goto out0; + } + + if (peripheral_request_list((u16 *)&per_cols[MAX_RC - pdata->cols], + DRV_NAME)) { + printk(KERN_ERR DRV_NAME + ": Requesting Peripherals failed\n"); + error = -EFAULT; + goto out1; + } + + bf54x_kpad->irq = platform_get_irq(pdev, 0); + if (bf54x_kpad->irq < 0) { + error = -ENODEV; + goto out2; + } + + error = request_irq(bf54x_kpad->irq, bfin_kpad_isr, + IRQF_SAMPLE_RANDOM, DRV_NAME, pdev); + if (error) { + printk(KERN_ERR DRV_NAME + ": unable to claim irq %d; error %d\n", + bf54x_kpad->irq, error); + goto out2; + } + + input = input_allocate_device(); + if (!input) { + error = -ENOMEM; + goto out3; + } + + bf54x_kpad->input = input; + + input->name = pdev->name; + input->phys = "bf54x-keys/input0"; + input->dev.parent = &pdev->dev; + + input_set_drvdata(input, bf54x_kpad); + + input->id.bustype = BUS_HOST; + input->id.vendor = 0x0001; + input->id.product = 0x0001; + input->id.version = 0x0100; + + input->keycodesize = sizeof(unsigned short); + input->keycodemax = pdata->keymapsize; + input->keycode = bf54x_kpad->keycode; + + bfin_keycodecpy(bf54x_kpad->keycode, pdata->keymap, pdata->keymapsize); + + /* setup input device */ + __set_bit(EV_KEY, input->evbit); + + if (pdata->repeat) + __set_bit(EV_REP, input->evbit); + + for (i = 0; i < input->keycodemax; i++) + __set_bit(bf54x_kpad->keycode[i] & KEY_MAX, input->keybit); + __clear_bit(KEY_RESERVED, input->keybit); + + error = input_register_device(input); + if (error) { + printk(KERN_ERR DRV_NAME + ": Unable to register input device (%d)\n", error); + goto out4; + } + + /* Init Keypad Key Up/Release test timer */ + + setup_timer(&bf54x_kpad->timer, bfin_kpad_timer, (unsigned long) pdev); + + bfin_write_KPAD_PRESCALE(bfin_kpad_get_prescale(TIME_SCALE)); + + bfin_write_KPAD_CTL((((pdata->cols - 1) << 13) & KPAD_COLEN) | + (((pdata->rows - 1) << 10) & KPAD_ROWEN) | + (2 & KPAD_IRQMODE)); + + bfin_write_KPAD_CTL(bfin_read_KPAD_CTL() | KPAD_EN); + + device_init_wakeup(&pdev->dev, 1); + + printk(KERN_ERR DRV_NAME + ": Blackfin BF54x Keypad registered IRQ %d\n", bf54x_kpad->irq); + + return 0; + +out4: + input_free_device(input); +out3: + free_irq(bf54x_kpad->irq, pdev); +out2: + peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]); +out1: + peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]); +out0: + kfree(bf54x_kpad->keycode); +out: + kfree(bf54x_kpad); + platform_set_drvdata(pdev, NULL); + + return error; +} + +static int __devexit bfin_kpad_remove(struct platform_device *pdev) +{ + struct bfin_kpad_platform_data *pdata = pdev->dev.platform_data; + struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev); + + del_timer_sync(&bf54x_kpad->timer); + free_irq(bf54x_kpad->irq, pdev); + + input_unregister_device(bf54x_kpad->input); + + peripheral_free_list((u16 *)&per_rows[MAX_RC - pdata->rows]); + peripheral_free_list((u16 *)&per_cols[MAX_RC - pdata->cols]); + + kfree(bf54x_kpad->keycode); + kfree(bf54x_kpad); + platform_set_drvdata(pdev, NULL); + + return 0; +} + +#ifdef CONFIG_PM +static int bfin_kpad_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev); + + bf54x_kpad->kpad_msel = bfin_read_KPAD_MSEL(); + bf54x_kpad->kpad_prescale = bfin_read_KPAD_PRESCALE(); + bf54x_kpad->kpad_ctl = bfin_read_KPAD_CTL(); + + if (device_may_wakeup(&pdev->dev)) + enable_irq_wake(bf54x_kpad->irq); + + return 0; +} + +static int bfin_kpad_resume(struct platform_device *pdev) +{ + struct bf54x_kpad *bf54x_kpad = platform_get_drvdata(pdev); + + bfin_write_KPAD_MSEL(bf54x_kpad->kpad_msel); + bfin_write_KPAD_PRESCALE(bf54x_kpad->kpad_prescale); + bfin_write_KPAD_CTL(bf54x_kpad->kpad_ctl); + + if (device_may_wakeup(&pdev->dev)) + disable_irq_wake(bf54x_kpad->irq); + + return 0; +} +#else +# define bfin_kpad_suspend NULL +# define bfin_kpad_resume NULL +#endif + +struct platform_driver bfin_kpad_device_driver = { + .driver = { + .name = DRV_NAME, + .owner = THIS_MODULE, + }, + .probe = bfin_kpad_probe, + .remove = __devexit_p(bfin_kpad_remove), + .suspend = bfin_kpad_suspend, + .resume = bfin_kpad_resume, +}; + +static int __init bfin_kpad_init(void) +{ + return platform_driver_register(&bfin_kpad_device_driver); +} + +static void __exit bfin_kpad_exit(void) +{ + platform_driver_unregister(&bfin_kpad_device_driver); +} + +module_init(bfin_kpad_init); +module_exit(bfin_kpad_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("Keypad driver for BF54x Processors"); +MODULE_ALIAS("platform:bf54x-keys"); |
