Hi Dmitry, On Tue, Oct 2, 2012 at 11:48 AM, Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> wrote: > Hi Sourav, > > On Mon, Oct 01, 2012 at 04:31:50PM +0530, Sourav Poddar wrote: >> From: G, Manjunath Kondaiah <manjugk@xxxxxx> >> >> SMSC ECE1099 is a keyboard scan or GPIO expansion device.The device >> supports a keypad scan matrix of 23*8.This driver uses this >> device as a keypad driver. >> >> Tested on omap5430 evm with 3.6-rc6 custom kernel. >> >> Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> >> Cc: Benoit Cousson <b-cousson@xxxxxx> >> Cc: Felipe Balbi <balbi@xxxxxx> >> Cc: Santosh Shilimkar <santosh.shilimkar@xxxxxx> >> Signed-off-by: G, Manjunath Kondaiah <manjugk@xxxxxx> >> Signed-off-by: Sourav Poddar <sourav.poddar@xxxxxx> >> Acked-by: Felipe Balbi <balbi@xxxxxx> >> --- >> Changes since v2: >> - Replace magic numbers through driver variable. >> - Provide comments for some initialisation done in probe. >> drivers/input/keyboard/Kconfig | 11 + >> drivers/input/keyboard/Makefile | 1 + >> drivers/input/keyboard/smsc-ece1099-keypad.c | 304 ++++++++++++++++++++++++++ >> 3 files changed, 316 insertions(+), 0 deletions(-) >> create mode 100644 drivers/input/keyboard/smsc-ece1099-keypad.c >> >> diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig >> index c50fa75..b03a39c 100644 >> --- a/drivers/input/keyboard/Kconfig >> +++ b/drivers/input/keyboard/Kconfig >> @@ -593,6 +593,17 @@ config KEYBOARD_TWL4030 >> To compile this driver as a module, choose M here: the >> module will be called twl4030_keypad. >> >> +config KEYBOARD_SMSC >> + tristate "SMSC ECE1099 keypad support" > > Should also select INPUT_MATRIXKMAP. > Yes, will include in the next version. >> + depends on I2C >> + help >> + Say Y here if your board use the smsc keypad controller >> + for omap5 defconfig. It's safe to say enable this >> + even on boards that don't use the keypad controller. >> + >> + To compile this driver as a module, choose M here: the >> + module will be called smsc-ece1099-keypad. >> + >> config KEYBOARD_XTKBD >> tristate "XT keyboard" >> select SERIO >> diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile >> index 44e7600..0f2aa26 100644 >> --- a/drivers/input/keyboard/Makefile >> +++ b/drivers/input/keyboard/Makefile >> @@ -52,5 +52,6 @@ obj-$(CONFIG_KEYBOARD_TC3589X) += tc3589x-keypad.o >> obj-$(CONFIG_KEYBOARD_TEGRA) += tegra-kbc.o >> obj-$(CONFIG_KEYBOARD_TNETV107X) += tnetv107x-keypad.o >> obj-$(CONFIG_KEYBOARD_TWL4030) += twl4030_keypad.o >> +obj-$(CONFIG_KEYBOARD_SMSC) += smsc-ece1099-keypad.o >> obj-$(CONFIG_KEYBOARD_XTKBD) += xtkbd.o >> obj-$(CONFIG_KEYBOARD_W90P910) += w90p910_keypad.o >> diff --git a/drivers/input/keyboard/smsc-ece1099-keypad.c b/drivers/input/keyboard/smsc-ece1099-keypad.c >> new file mode 100644 >> index 0000000..15dc147 >> --- /dev/null >> +++ b/drivers/input/keyboard/smsc-ece1099-keypad.c >> @@ -0,0 +1,304 @@ >> +/* >> + * SMSC_ECE1099 Keypad driver >> + * >> + * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ >> + * >> + * 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. >> + */ >> + >> +#include <linux/i2c.h> >> +#include <linux/kernel.h> >> +#include <linux/module.h> >> +#include <linux/init.h> >> +#include <linux/interrupt.h> >> +#include <linux/input.h> >> +#include <linux/gpio.h> >> +#include <linux/slab.h> >> +#include <linux/jiffies.h> >> +#include <linux/input/matrix_keypad.h> >> +#include <linux/delay.h> >> +#include <linux/mfd/core.h> >> +#include <linux/mfd/smsc.h> >> +#include <linux/of_gpio.h> >> +#include <linux/of.h> >> + >> +#define KEYPRESS_TIME 200 >> + >> +struct smsc_keypad { >> + struct smsc *smsc; >> + struct matrix_keymap_data *keymap_data; >> + unsigned int last_key_state[16]; >> + unsigned int last_col; >> + unsigned int last_key_ms[16]; >> + unsigned short *keymap; >> + struct i2c_client *client; >> + struct input_dev *input; >> + int rows, cols; >> + int row_shift; >> + bool no_autorepeat; >> + unsigned irq; >> + struct device *dev; >> +}; >> + >> +static void smsc_kp_scan(struct smsc_keypad *kp) >> +{ >> + struct input_dev *input = kp->input; >> + int i, j; >> + int row, col; >> + int temp, code; >> + unsigned int new_state[16]; >> + unsigned int bits_changed; >> + int this_ms; >> + >> + smsc_write(kp->dev, SMSC_KP_INT_MASK, 0x00); >> + smsc_write(kp->dev, SMSC_KP_INT_STAT, 0xFF); >> + >> + /* Scan for row and column */ >> + for (i = 0; i < kp->cols; i++) { >> + smsc_write(kp->dev, SMSC_KP_OUT, SMSC_KSO_EVAL + i); >> + /* Read Row Status */ >> + smsc_read(kp->dev, SMSC_KP_IN, &temp); >> + if (temp == 0xFF) >> + continue; >> + >> + col = i; >> + for (j = 0; j < kp->rows; j++) { >> + if ((temp & 0x01) != 0x00) { >> + temp = temp >> 1; >> + continue; >> + } >> + >> + row = j; >> + new_state[col] = (1 << row); >> + bits_changed = kp->last_key_state[col] ^ new_state[col]; >> + this_ms = jiffies_to_msecs(jiffies); >> + if (bits_changed != 0 || (!bits_changed && >> + ((this_ms - kp->last_key_ms[col]) >= KEYPRESS_TIME))) { >> + code = MATRIX_SCAN_CODE(row, col, kp->row_shift); >> + input_event(input, EV_MSC, MSC_SCAN, code); >> + input_report_key(input, kp->keymap[code], 1); >> + input_report_key(input, kp->keymap[code], 0); >> + kp->last_key_state[col] = new_state[col]; >> + if (kp->last_col != col) >> + kp->last_key_state[kp->last_col] = 0; >> + kp->last_key_ms[col] = this_ms; >> + } >> + temp = temp >> 1; >> + } >> + } >> + input_sync(input); >> + >> + smsc_write(kp->dev, SMSC_KP_INT_MASK, 0xFF); >> + >> + /* Set up Low Power Mode (Wake-up) (0xFB) */ >> + smsc_write(kp->dev, SMSC_WKUP_CTRL, SMSC_KP_SET_LOW_PWR); >> + >> + /*Enable Keypad Scan (generate interrupt on key press) (0x40)*/ >> + smsc_write(kp->dev, SMSC_KP_OUT, SMSC_KSO_ALL_LOW); >> +} >> + >> +static irqreturn_t do_kp_irq(int irq, void *_kp) >> +{ >> + struct smsc_keypad *kp = _kp; >> + int int_status; >> + >> + smsc_read(kp->dev, SMSC_KP_INT_STAT, &int_status); >> + if (int_status) >> + smsc_kp_scan(kp); >> + >> + return IRQ_HANDLED; >> +} >> + >> +#ifdef CONFIG_OF >> +static int __devinit smsc_keypad_parse_dt(struct device *dev, >> + struct smsc_keypad *kp) >> +{ >> + struct device_node *np = dev->of_node; >> + >> + if (!np) { >> + dev_err(dev, "missing DT data"); >> + return -EINVAL; >> + } >> + >> + of_property_read_u32(np, "keypad,num-rows", &kp->rows); >> + of_property_read_u32(np, "keypad,num-columns", &kp->cols); >> + if (!kp->rows || !kp->cols) { >> + dev_err(dev, "number of keypad rows/columns not specified\n"); >> + return -EINVAL; >> + } >> + >> + if (of_property_read_bool(np, "linux,input-no-autorepeat")) >> + kp->no_autorepeat = true; >> + >> + return 0; >> +} >> +#else >> +static inline int smsc_keypad_parse_dt(struct device *dev, >> + struct smsc_keypad *kp) >> +{ >> + return -ENOSYS; >> +} >> +#endif >> + >> +static int __devinit >> +smsc_probe(struct platform_device *pdev) >> +{ >> + struct device *dev = &pdev->dev; >> + struct smsc *smsc = dev_get_drvdata(pdev->dev.parent); >> + struct input_dev *input; >> + struct smsc_keypad *kp; >> + int ret = 0, error; >> + int col, i, max_keys, row_shift; >> + int irq; >> + int addr; >> + >> + kp = devm_kzalloc(dev, sizeof(*kp), GFP_KERNEL); >> + >> + input = input_allocate_device(); >> + if (!kp || !input) { >> + error = -ENOMEM; >> + goto err1; >> + } >> + >> + error = smsc_keypad_parse_dt(&pdev->dev, kp); > > It doe snot look like the driver is useful without DT... Should it > simply depend on OF and not even provide !OF stubs? > Yes, the idea was to make this driver completely dt specific. >> + if (error) > > You are leaking input device here. > True, will include appropriate goto label. >> + return error; >> + >> + /* Get the debug Device */ >> + kp->input = input; >> + kp->smsc = smsc; >> + kp->irq = platform_get_irq(pdev, 0); >> + kp->dev = dev; >> + >> + for (col = 0; col < 16; col++) { >> + kp->last_key_state[col] = 0; >> + kp->last_key_ms[col] = 0; > > kzalloc should have already taken care of this. > Ok. Will remove. >> + } >> + >> + /* setup input device */ >> + __set_bit(EV_KEY, input->evbit); >> + >> + /* Enable auto repeat feature of Linux input subsystem */ >> + if (!(kp->no_autorepeat)) > > No need for extra parenthesis. > Will remove. >> + __set_bit(EV_REP, input->evbit); >> + >> + input_set_capability(input, EV_MSC, MSC_SCAN); >> + input->name = "SMSC Keypad"; >> + input->phys = "smsc_keypad/input0"; >> + input->dev.parent = &pdev->dev; >> + input->id.bustype = BUS_HOST; >> + input->id.vendor = 0x0001; >> + input->id.product = 0x0001; >> + input->id.version = 0x0003; >> + >> + error = input_register_device(input); >> + if (error) { >> + dev_err(kp->dev, >> + "Unable to register twl4030 keypad device\n"); >> + goto err1; >> + } >> + >> + /* Mask all GPIO interrupts (0x37-0x3B) */ >> + for (addr = SMSC_GPIO_INT_MASK_START; >> + addr < SMSC_GPIO_INT_MASK_START + 4; addr++) >> + smsc_write(dev, addr, 0); >> + >> + /* Set all outputs high (0x05-0x09) */ >> + for (addr = SMSC_GPIO_DATA_OUT_START; >> + addr < SMSC_GPIO_DATA_OUT_START + 4; addr++) >> + smsc_write(dev, addr, 0xff); >> + >> + /* Clear all GPIO interrupts (0x32-0x36) */ >> + for (addr = SMSC_GPIO_INT_STAT_START; >> + addr < SMSC_GPIO_INT_STAT_START + 4; addr++) >> + smsc_write(dev, addr, 0xff); >> + >> + /* Configure the smsc pins as Keyboard scan Input */ >> + for (i = 0; i <= kp->rows; i++) { >> + addr = 0x12 + i; >> + smsc_write(dev, addr, SMSC_KP_KSI); >> + } >> + >> + /* Configure the smsc pins as Keyboard scan output */ >> + for (i = 0; i <= kp->cols; i++) { >> + addr = 0x1A + i; >> + smsc_write(dev, addr, SMSC_KP_KSO); >> + } >> + >> + smsc_write(dev, SMSC_KP_INT_STAT, SMSC_KP_SET_HIGH); >> + smsc_write(dev, SMSC_WKUP_CTRL, SMSC_KP_SET_LOW_PWR); >> + smsc_write(dev, SMSC_KP_OUT, SMSC_KSO_ALL_LOW); >> + >> + row_shift = get_count_order(kp->cols); >> + max_keys = kp->rows << row_shift; >> + >> + kp->row_shift = row_shift; >> + kp->keymap = devm_kzalloc(dev, max_keys * sizeof(kp->keymap[0]), >> + GFP_KERNEL); >> + if (!kp->keymap) { >> + dev_err(&pdev->dev, "Not enough memory for keymap\n"); >> + error = -ENOMEM; >> + } >> + >> + matrix_keypad_build_keymap(NULL, NULL, kp->rows, >> + kp->cols, kp->keymap, input); > > Needs error handling I believe. > True, missed that. Will include. >> + >> + /* >> + * This ISR will always execute in kernel thread context because of >> + * the need to access the SMSC over the I2C bus. >> + */ >> + ret = devm_request_threaded_irq(dev, kp->irq, NULL, do_kp_irq, >> + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, pdev->name, kp); >> + if (ret) { >> + dev_dbg(&pdev->dev, "request_irq failed for irq no=%d\n", >> + irq); >> + goto err2; >> + } >> + >> + /* Enable smsc keypad interrupts */ >> + ret = smsc_write(dev, SMSC_KP_INT_MASK, 0xff); >> + if (ret < 0) >> + goto err2; >> + >> + return 0; >> + >> +err2: >> + input_unregister_device(input); >> +err1: >> + input_free_device(input); > > Double free. > I believe what you are trying to say here is that we dont really need a " input_unregister_device" (as also I checked in other keypad implementations) and do a "unregister_device" in the remove api ?? >> + return ret; >> +} >> + >> +static int __devexit smsc_remove(struct platform_device *pdev) >> +{ >> + struct smsc_keypad *kp = platform_get_drvdata(pdev); >> + input_unregister_device(kp->input); > > And your kernel goes *BOOM* > >> + >> + return 0; >> +} >> + >> +#ifdef CONFIG_OF >> +static const struct of_device_id smsc_keypad_dt_match[] = { >> + { .compatible = "smsc,keypad" }, >> + {}, >> +}; >> +MODULE_DEVICE_TABLE(of, smsc_keypad_dt_match); >> +#endif >> + >> +static struct platform_driver smsc_driver = { >> + .driver = { >> + .name = "smsc-keypad", >> + .of_match_table = of_match_ptr(smsc_keypad_dt_match), >> + .owner = THIS_MODULE, >> + }, >> + .probe = smsc_probe, >> + .remove = __devexit_p(smsc_remove), >> +}; >> + >> +module_platform_driver(smsc_driver); >> + >> +MODULE_AUTHOR("G Kondaiah Manjunath <manjugk@xxxxxx>"); >> +MODULE_DESCRIPTION("SMSC ECE1099 Keypad driver"); >> +MODULE_LICENSE("GPL v2"); >> -- >> 1.7.1 >> > > Thanks. > > -- > Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
