| /* |
| * 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/slab.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_nosync(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) { |
| dev_err(&pdev->dev, "no rows, cols or keymap from pdata\n"); |
| return -EINVAL; |
| } |
| |
| if (!pdata->keymapsize || |
| pdata->keymapsize > (pdata->rows * pdata->cols)) { |
| dev_err(&pdev->dev, "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) { |
| dev_warn(&pdev->dev, |
| "invalid platform debounce/columndrive time\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)) { |
| dev_err(&pdev->dev, "requesting peripherals failed\n"); |
| error = -EFAULT; |
| goto out0; |
| } |
| |
| if (peripheral_request_list((u16 *)&per_cols[MAX_RC - pdata->cols], |
| DRV_NAME)) { |
| dev_err(&pdev->dev, "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, |
| 0, DRV_NAME, pdev); |
| if (error) { |
| dev_err(&pdev->dev, "unable to claim irq %d\n", |
| bf54x_kpad->irq); |
| 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) { |
| dev_err(&pdev->dev, "unable to register input device\n"); |
| 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); |
| |
| 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, |
| }; |
| module_platform_driver(bfin_kpad_device_driver); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
| MODULE_DESCRIPTION("Keypad driver for BF54x Processors"); |
| MODULE_ALIAS("platform:bf54x-keys"); |