Hi Sourav, On Fri, Oct 05, 2012 at 12:56:26PM +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: 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> > --- > This patch was posted as a series initially > http://www.spinics.net/lists/linux-omap/msg78772.html > > But the parent mfd driver has beeen already picked by mfd maintainer. > So this patch can now posted as an standalone patch. > > v3->v4: > Fix Dmitry's comments: > - Error patch(input_free_device/input_unregister_device). > - Few cleanups. > - Included INPUT_MATRIXKMAP > drivers/input/keyboard/Kconfig | 12 + > drivers/input/keyboard/Makefile | 1 + > drivers/input/keyboard/smsc-ece1099-keypad.c | 303 ++++++++++++++++++++++++++ > 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..e370b03 100644 > --- a/drivers/input/keyboard/Kconfig > +++ b/drivers/input/keyboard/Kconfig > @@ -593,6 +593,18 @@ 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" > + depends on I2C > + select INPUT_MATRIXKMAP While I do not see hard dependencies in the driver itself, should we also depend on MFD_SMSC? > + 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..a4a0dfe > --- /dev/null > +++ b/drivers/input/keyboard/smsc-ece1099-keypad.c > @@ -0,0 +1,303 @@ > +/* > + * 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; I do not see this being actually used. > + struct matrix_keymap_data *keymap_data; Does not seem to be used. > + 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; I do not think you need to store irq if you are using managed resources. > + 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; > + } Maybe split inner loop into separate function? > + } > + 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; > + int i, max_keys, row_shift; > + int irq; > + int addr; > + > + kp = devm_kzalloc(dev, sizeof(*kp), GFP_KERNEL); > + > + input = input_allocate_device(); > + if (!kp || !input) { > + ret = -ENOMEM; > + goto err1; > + } > + > + ret = smsc_keypad_parse_dt(&pdev->dev, kp); > + if (ret) > + goto err1; So this is pure-DT driver. Please add Kconfig dependency on OF, drop #ifdef guards and the stub. > + > + /* Get the debug Device */ > + kp->input = input; > + kp->smsc = smsc; > + kp->irq = platform_get_irq(pdev, 0); > + kp->dev = dev; > + > + /* setup input device */ > + __set_bit(EV_KEY, input->evbit); > + > + /* Enable auto repeat feature of Linux input subsystem */ > + if (!kp->no_autorepeat) > + __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; > + > + /* 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); You use lowercase hex digits here but also uppercase in other parts of the driver. Can we use lowercase throughout please? > + > + /* Configure the smsc pins as Keyboard scan Input */ > + for (i = 0; i <= kp->rows; i++) { You sure you don't want < instead of <= ? > + 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"); > + ret = -ENOMEM; > + } > + > + ret = matrix_keypad_build_keymap(NULL, NULL, kp->rows, > + kp->cols, kp->keymap, input); > + if (ret) { > + dev_err(&pdev->dev, "failed to build keymap\n"); > + goto err1; > + } > + > + /* > + * 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 err1; > + } > + > + /* Enable smsc keypad interrupts */ > + ret = smsc_write(dev, SMSC_KP_INT_MASK, 0xff); > + if (ret < 0) > + goto err2; Consider implementing ->open() and ->close() and putting the above there. > + > + ret = input_register_device(input); > + if (ret) { > + dev_err(kp->dev, > + "Unable to register twl4030 keypad device\n"); > + goto err2; > + } > + > + return 0; > + > +err2: > + free_irq(kp->irq, kp); If you allocate IRQ with devm_request_threaded_irq then you should free it with devm_free_irq(). > +err1: > + input_free_device(input); > + return ret; > +} > + > +static int __devexit smsc_remove(struct platform_device *pdev) > +{ > + struct smsc_keypad *kp = platform_get_drvdata(pdev); > + input_unregister_device(kp->input); This is wrong: input device is gone but IRQs are still active. You need to disable or free IRQ first. However I just posted a patch adding support for managed input devices: http://www.spinics.net/lists/linux-input/msg23077.html so please either switch over, or go with unmanaged resources throughout. > + > + return 0; > +} > + > +#ifdef CONFIG_OF Since we require DT this ifdef is not needed. > +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-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
