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    Subject[PATCH] input: keyboard: introduce lm8323 driver
    Date
    From: Felipe Balbi <felipe.balbi@nokia.com>

    lm8323 is the keypad driver used in n810 device. This
    driver has been sitting in linux-omap for quite a long
    time, it's about time to get comments from upstream and
    get it merged.

    Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
    ---
    drivers/input/keyboard/Kconfig | 7 +
    drivers/input/keyboard/Makefile | 1 +
    drivers/input/keyboard/lm8323.c | 913 +++++++++++++++++++++++++++++++++++++++
    include/linux/i2c/lm8323.h | 35 ++
    4 files changed, 956 insertions(+), 0 deletions(-)
    create mode 100644 drivers/input/keyboard/lm8323.c
    create mode 100644 include/linux/i2c/lm8323.h

    diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
    index 3556168..2da936b 100644
    --- a/drivers/input/keyboard/Kconfig
    +++ b/drivers/input/keyboard/Kconfig
    @@ -259,6 +259,13 @@ config KEYBOARD_OMAP
    To compile this driver as a module, choose M here: the
    module will be called omap-keypad.

    +config KEYBOARD_LM8323
    + tristate "LM8323 keypad chip"
    + depends on I2C
    + help
    + If you say yes here you get support for the National Semiconductor
    + LM8323 keypad controller.
    +
    config KEYBOARD_PXA27x
    tristate "PXA27x/PXA3xx keypad support"
    depends on PXA27x || PXA3xx
    diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
    index 36351e1..f8bf562 100644
    --- a/drivers/input/keyboard/Makefile
    +++ b/drivers/input/keyboard/Makefile
    @@ -19,6 +19,7 @@ obj-$(CONFIG_KEYBOARD_TOSA) += tosakbd.o
    obj-$(CONFIG_KEYBOARD_HIL) += hil_kbd.o
    obj-$(CONFIG_KEYBOARD_HIL_OLD) += hilkbd.o
    obj-$(CONFIG_KEYBOARD_OMAP) += omap-keypad.o
    +obj-$(CONFIG_KEYBOARD_LM8323) += lm8323.o
    obj-$(CONFIG_KEYBOARD_PXA27x) += pxa27x_keypad.o
    obj-$(CONFIG_KEYBOARD_PXA930_ROTARY) += pxa930_rotary.o
    obj-$(CONFIG_KEYBOARD_AAED2000) += aaed2000_kbd.o
    diff --git a/drivers/input/keyboard/lm8323.c b/drivers/input/keyboard/lm8323.c
    new file mode 100644
    index 0000000..27da93c
    --- /dev/null
    +++ b/drivers/input/keyboard/lm8323.c
    @@ -0,0 +1,913 @@
    +/*
    + * drivers/i2c/chips/lm8323.c
    + *
    + * Copyright (C) 2007 Nokia Corporation
    + *
    + * Written by Daniel Stone <daniel.stone@nokia.com>
    + * Timo O. Karjalainen <timo.o.karjalainen@nokia.com>
    + *
    + * 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 of the License only).
    + *
    + * 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, write to the Free Software
    + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    + */
    +
    +#include <linux/module.h>
    +#include <linux/i2c.h>
    +#include <linux/interrupt.h>
    +#include <linux/sched.h>
    +#include <linux/mutex.h>
    +#include <linux/delay.h>
    +#include <linux/input.h>
    +#include <linux/leds.h>
    +#include <linux/i2c/lm8323.h>
    +
    +/* Commands to send to the chip. */
    +#define LM8323_CMD_READ_ID 0x80 /* Read chip ID. */
    +#define LM8323_CMD_WRITE_CFG 0x81 /* Set configuration item. */
    +#define LM8323_CMD_READ_INT 0x82 /* Get interrupt status. */
    +#define LM8323_CMD_RESET 0x83 /* Reset, same as external one */
    +#define LM8323_CMD_WRITE_PORT_SEL 0x85 /* Set GPIO in/out. */
    +#define LM8323_CMD_WRITE_PORT_STATE 0x86 /* Set GPIO pullup. */
    +#define LM8323_CMD_READ_PORT_SEL 0x87 /* Get GPIO in/out. */
    +#define LM8323_CMD_READ_PORT_STATE 0x88 /* Get GPIO pullup. */
    +#define LM8323_CMD_READ_FIFO 0x89 /* Read byte from FIFO. */
    +#define LM8323_CMD_RPT_READ_FIFO 0x8a /* Read FIFO (no increment). */
    +#define LM8323_CMD_SET_ACTIVE 0x8b /* Set active time. */
    +#define LM8323_CMD_READ_ERR 0x8c /* Get error status. */
    +#define LM8323_CMD_READ_ROTATOR 0x8e /* Read rotator status. */
    +#define LM8323_CMD_SET_DEBOUNCE 0x8f /* Set debouncing time. */
    +#define LM8323_CMD_SET_KEY_SIZE 0x90 /* Set keypad size. */
    +#define LM8323_CMD_READ_KEY_SIZE 0x91 /* Get keypad size. */
    +#define LM8323_CMD_READ_CFG 0x92 /* Get configuration item. */
    +#define LM8323_CMD_WRITE_CLOCK 0x93 /* Set clock config. */
    +#define LM8323_CMD_READ_CLOCK 0x94 /* Get clock config. */
    +#define LM8323_CMD_PWM_WRITE 0x95 /* Write PWM script. */
    +#define LM8323_CMD_START_PWM 0x96 /* Start PWM engine. */
    +#define LM8323_CMD_STOP_PWM 0x97 /* Stop PWM engine. */
    +
    +/* Interrupt status. */
    +#define INT_KEYPAD 0x01 /* Key event. */
    +#define INT_ROTATOR 0x02 /* Rotator event. */
    +#define INT_ERROR 0x08 /* Error: use CMD_READ_ERR. */
    +#define INT_NOINIT 0x10 /* Lost configuration. */
    +#define INT_PWM1 0x20 /* PWM1 stopped. */
    +#define INT_PWM2 0x40 /* PWM2 stopped. */
    +#define INT_PWM3 0x80 /* PWM3 stopped. */
    +
    +/* Errors (signalled by INT_ERROR, read with CMD_READ_ERR). */
    +#define ERR_BADPAR 0x01 /* Bad parameter. */
    +#define ERR_CMDUNK 0x02 /* Unknown command. */
    +#define ERR_KEYOVR 0x04 /* Too many keys pressed. */
    +#define ERR_FIFOOVER 0x40 /* FIFO overflow. */
    +
    +/* Configuration keys (CMD_{WRITE,READ}_CFG). */
    +#define CFG_MUX1SEL 0x01 /* Select MUX1_OUT input. */
    +#define CFG_MUX1EN 0x02 /* Enable MUX1_OUT. */
    +#define CFG_MUX2SEL 0x04 /* Select MUX2_OUT input. */
    +#define CFG_MUX2EN 0x08 /* Enable MUX2_OUT. */
    +#define CFG_PSIZE 0x20 /* Package size (must be 0). */
    +#define CFG_ROTEN 0x40 /* Enable rotator. */
    +
    +/* Clock settings (CMD_{WRITE,READ}_CLOCK). */
    +#define CLK_RCPWM_INTERNAL 0x00
    +#define CLK_RCPWM_EXTERNAL 0x03
    +#define CLK_SLOWCLKEN 0x08 /* Enable 32.768kHz clock. */
    +#define CLK_SLOWCLKOUT 0x40 /* Enable slow pulse output. */
    +
    +/* The possible addresses corresponding to CONFIG1 and CONFIG2 pin wirings. */
    +#define LM8323_I2C_ADDR00 (0x84 >> 1) /* 1000 010x */
    +#define LM8323_I2C_ADDR01 (0x86 >> 1) /* 1000 011x */
    +#define LM8323_I2C_ADDR10 (0x88 >> 1) /* 1000 100x */
    +#define LM8323_I2C_ADDR11 (0x8A >> 1) /* 1000 101x */
    +
    +/* Key event fifo length */
    +#define LM8323_FIFO_LEN 15
    +
    +/* Commands for PWM engine; feed in with PWM_WRITE. */
    +/* Load ramp counter from duty cycle field (range 0 - 0xff). */
    +#define PWM_SET(v) (0x4000 | ((v) & 0xff))
    +/* Go to start of script. */
    +#define PWM_GOTOSTART 0x0000
    +/*
    + * Stop engine (generates interrupt). If reset is 1, clear the program
    + * counter, else leave it.
    + */
    +#define PWM_END(reset) (0xc000 | (!!(reset) << 11))
    +/*
    + * Ramp. If s is 1, divide clock by 512, else divide clock by 16.
    + * Take t clock scales (up to 63) per step, for n steps (up to 126).
    + * If u is set, ramp up, else ramp down.
    + */
    +#define PWM_RAMP(s, t, n, u) ((!!(s) << 14) | ((t) & 0x3f) << 8 | \
    + ((n) & 0x7f) | ((u) ? 0 : 0x80))
    +/*
    + * Loop (i.e. jump back to pos) for a given number of iterations (up to 63).
    + * If cnt is zero, execute until PWM_END is encountered.
    + */
    +#define PWM_LOOP(cnt, pos) (0xa000 | (((cnt) & 0x3f) << 7) | \
    + ((pos) & 0x3f))
    +/*
    + * Wait for trigger. Argument is a mask of channels, shifted by the channel
    + * number, e.g. 0xa for channels 3 and 1. Note that channels are numbered
    + * from 1, not 0.
    + */
    +#define PWM_WAIT_TRIG(chans) (0xe000 | (((chans) & 0x7) << 6))
    +/* Send trigger. Argument is same as PWM_WAIT_TRIG. */
    +#define PWM_SEND_TRIG(chans) (0xe000 | ((chans) & 0x7))
    +
    +struct lm8323_pwm {
    + int id;
    + int enabled;
    + int fade_time;
    + int brightness;
    + int desired_brightness;
    + int running;
    + struct mutex lock;
    + struct work_struct work;
    + struct led_classdev cdev;
    +};
    +
    +struct lm8323_chip {
    + struct mutex lock;
    + struct i2c_client *client;
    + struct work_struct work;
    + struct input_dev *idev;
    + unsigned kp_enabled : 1;
    + unsigned pm_suspend : 1;
    + unsigned keys_down;
    + char phys[32];
    + s16 keymap[LM8323_KEYMAP_SIZE];
    + int size_x;
    + int size_y;
    + int debounce_time;
    + int active_time;
    + struct lm8323_pwm pwm1;
    + struct lm8323_pwm pwm2;
    + struct lm8323_pwm pwm3;
    +};
    +
    +#define client_to_lm8323(c) container_of(c, struct lm8323_chip, client)
    +#define dev_to_lm8323(d) container_of(d, struct lm8323_chip, client->dev)
    +#define work_to_lm8323(w) container_of(w, struct lm8323_chip, work)
    +#define cdev_to_pwm(c) container_of(c, struct lm8323_pwm, cdev)
    +#define work_to_pwm(w) container_of(w, struct lm8323_pwm, work)
    +
    +static struct lm8323_chip *pwm_to_lm8323(struct lm8323_pwm *pwm)
    +{
    + switch (pwm->id) {
    + case 1:
    + return container_of(pwm, struct lm8323_chip, pwm1);
    + case 2:
    + return container_of(pwm, struct lm8323_chip, pwm2);
    + case 3:
    + return container_of(pwm, struct lm8323_chip, pwm3);
    + default:
    + return NULL;
    + }
    +}
    +
    +#define LM8323_MAX_DATA 8
    +
    +/*
    + * To write, we just access the chip's address in write mode, and dump the
    + * command and data out on the bus. The command byte and data are taken as
    + * sequential u8s out of varargs, to a maximum of LM8323_MAX_DATA.
    + */
    +static int lm8323_write(struct lm8323_chip *lm, int len, ...)
    +{
    + int ret, i;
    + va_list ap;
    + u8 data[LM8323_MAX_DATA];
    +
    + va_start(ap, len);
    +
    + if (unlikely(len > LM8323_MAX_DATA)) {
    + dev_err(&lm->client->dev, "tried to send %d bytes\n", len);
    + va_end(ap);
    + return 0;
    + }
    +
    + for (i = 0; i < len; i++)
    + data[i] = va_arg(ap, int);
    +
    + va_end(ap);
    +
    + /*
    + * If the host is asleep while we send the data, we can get a NACK
    + * back while it wakes up, so try again, once.
    + */
    + ret = i2c_master_send(lm->client, data, len);
    + if (unlikely(ret == -EREMOTEIO))
    + ret = i2c_master_send(lm->client, data, len);
    + if (unlikely(ret != len))
    + dev_err(&lm->client->dev, "sent %d bytes of %d total\n",
    + len, ret);
    +
    + return ret;
    +}
    +
    +/*
    + * To read, we first send the command byte to the chip and end the transaction,
    + * then access the chip in read mode, at which point it will send the data.
    + */
    +static int lm8323_read(struct lm8323_chip *lm, u8 cmd, u8 *buf, int len)
    +{
    + int ret;
    +
    + /*
    + * If the host is asleep while we send the byte, we can get a NACK
    + * back while it wakes up, so try again, once.
    + */
    + ret = i2c_master_send(lm->client, &cmd, 1);
    + if (unlikely(ret == -EREMOTEIO))
    + ret = i2c_master_send(lm->client, &cmd, 1);
    + if (unlikely(ret != 1)) {
    + dev_err(&lm->client->dev, "sending read cmd 0x%02x failed\n",
    + cmd);
    + return 0;
    + }
    +
    + ret = i2c_master_recv(lm->client, buf, len);
    + if (unlikely(ret != len))
    + dev_err(&lm->client->dev, "wanted %d bytes, got %d\n",
    + len, ret);
    +
    + return ret;
    +}
    +
    +/*
    + * Set the chip active time (idle time before it enters halt).
    + */
    +static void lm8323_set_active_time(struct lm8323_chip *lm, int time)
    +{
    + lm8323_write(lm, 2, LM8323_CMD_SET_ACTIVE, time >> 2);
    +}
    +
    +/*
    + * The signals are AT-style: the low 7 bits are the keycode, and the top
    + * bit indicates the state (1 for down, 0 for up).
    + */
    +static inline u8 lm8323_whichkey(u8 event)
    +{
    + return event & 0x7f;
    +}
    +
    +static inline int lm8323_ispress(u8 event)
    +{
    + return (event & 0x80) ? 1 : 0;
    +}
    +
    +static void process_keys(struct lm8323_chip *lm)
    +{
    + u8 event;
    + u8 key_fifo[LM8323_FIFO_LEN + 1];
    + int old_keys_down = lm->keys_down;
    + int ret;
    + int i = 0;
    +
    + /*
    + * Read all key events from the FIFO at once. Next READ_FIFO clears the
    + * FIFO even if we didn't read all events previously.
    + */
    + ret = lm8323_read(lm, LM8323_CMD_READ_FIFO, key_fifo, LM8323_FIFO_LEN);
    +
    + if (ret < 0) {
    + dev_err(&lm->client->dev, "Failed reading fifo \n");
    + return;
    + }
    + key_fifo[ret] = 0;
    +
    + while ((event = key_fifo[i])) {
    + u8 key = lm8323_whichkey(event);
    + int isdown = lm8323_ispress(event);
    + s16 keycode = lm->keymap[key];
    +
    + if (likely(keycode > 0)) {
    + dev_vdbg(&lm->client->dev, "key 0x%02x %s\n", key,
    + isdown ? "down" : "up");
    + if (likely(lm->kp_enabled)) {
    + input_report_key(lm->idev, keycode, isdown);
    + input_sync(lm->idev);
    + }
    + if (isdown)
    + lm->keys_down++;
    + else
    + lm->keys_down--;
    + } else {
    + dev_err(&lm->client->dev, "keycode 0x%02x not mapped "
    + "to any key\n", key);
    + }
    + i++;
    + }
    +
    + /*
    + * Errata: We need to ensure that the chip never enters halt mode
    + * during a keypress, so set active time to 0. When it's released,
    + * we can enter halt again, so set the active time back to normal.
    + */
    + if (!old_keys_down && lm->keys_down)
    + lm8323_set_active_time(lm, 0);
    + if (old_keys_down && !lm->keys_down)
    + lm8323_set_active_time(lm, lm->active_time);
    +}
    +
    +static void lm8323_process_error(struct lm8323_chip *lm)
    +{
    + u8 error;
    +
    + if (lm8323_read(lm, LM8323_CMD_READ_ERR, &error, 1) == 1) {
    + if (error & ERR_FIFOOVER)
    + dev_vdbg(&lm->client->dev, "fifo overflow!\n");
    + if (error & ERR_KEYOVR)
    + dev_vdbg(&lm->client->dev, "more than two keys pressed\n");
    + if (error & ERR_CMDUNK)
    + dev_vdbg(&lm->client->dev, "unknown command submitted\n");
    + if (error & ERR_BADPAR)
    + dev_vdbg(&lm->client->dev, "bad command parameter\n");
    + }
    +}
    +
    +static void lm8323_reset(struct lm8323_chip *lm)
    +{
    + /* The docs say we must pass 0xAA as the data byte. */
    + lm8323_write(lm, 2, LM8323_CMD_RESET, 0xAA);
    +}
    +
    +static int lm8323_configure(struct lm8323_chip *lm)
    +{
    + int keysize = (lm->size_x << 4) | lm->size_y;
    + int clock = (CLK_SLOWCLKEN | CLK_RCPWM_EXTERNAL);
    + int debounce = lm->debounce_time >> 2;
    + int active = lm->active_time >> 2;
    +
    + /*
    + * Active time must be greater than the debounce time: if it's
    + * a close-run thing, give ourselves a 12ms buffer.
    + */
    + if (debounce >= active)
    + active = debounce + 3;
    +
    + lm8323_write(lm, 2, LM8323_CMD_WRITE_CFG, 0);
    + lm8323_write(lm, 2, LM8323_CMD_WRITE_CLOCK, clock);
    + lm8323_write(lm, 2, LM8323_CMD_SET_KEY_SIZE, keysize);
    + lm8323_set_active_time(lm, lm->active_time);
    + lm8323_write(lm, 2, LM8323_CMD_SET_DEBOUNCE, debounce);
    + lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_STATE, 0xff, 0xff);
    + lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_SEL, 0, 0);
    +
    + /*
    + * Not much we can do about errors at this point, so just hope
    + * for the best.
    + */
    +
    + return 0;
    +}
    +
    +static void pwm_done(struct lm8323_pwm *pwm)
    +{
    + mutex_lock(&pwm->lock);
    + pwm->running = 0;
    + if (pwm->desired_brightness != pwm->brightness)
    + schedule_work(&pwm->work);
    + mutex_unlock(&pwm->lock);
    +}
    +
    +/*
    + * Bottom half: handle the interrupt by posting key events, or dealing with
    + * errors appropriately.
    + */
    +static void lm8323_work(struct work_struct *work)
    +{
    + struct lm8323_chip *lm = work_to_lm8323(work);
    + u8 ints;
    +
    + mutex_lock(&lm->lock);
    +
    + while ((lm8323_read(lm, LM8323_CMD_READ_INT, &ints, 1) == 1) && ints) {
    + if (likely(ints & INT_KEYPAD))
    + process_keys(lm);
    + if (ints & INT_ROTATOR) {
    + /* We don't currently support the rotator. */
    + dev_vdbg(&lm->client->dev, "rotator fired\n");
    + }
    + if (ints & INT_ERROR) {
    + dev_vdbg(&lm->client->dev, "error!\n");
    + lm8323_process_error(lm);
    + }
    + if (ints & INT_NOINIT) {
    + dev_err(&lm->client->dev, "chip lost config; "
    + "reinitialising\n");
    + lm8323_configure(lm);
    + }
    + if (ints & INT_PWM1) {
    + dev_vdbg(&lm->client->dev, "pwm1 engine completed\n");
    + pwm_done(&lm->pwm1);
    + }
    + if (ints & INT_PWM2) {
    + dev_vdbg(&lm->client->dev, "pwm2 engine completed\n");
    + pwm_done(&lm->pwm2);
    + }
    + if (ints & INT_PWM3) {
    + dev_vdbg(&lm->client->dev, "pwm3 engine completed\n");
    + pwm_done(&lm->pwm3);
    + }
    + }
    +
    + mutex_unlock(&lm->lock);
    +}
    +
    +/*
    + * We cannot use I2C in interrupt context, so we just schedule work.
    + */
    +static irqreturn_t lm8323_irq(int irq, void *data)
    +{
    + struct lm8323_chip *lm = data;
    +
    + schedule_work(&lm->work);
    +
    + return IRQ_HANDLED;
    +}
    +
    +/*
    + * Read the chip ID.
    + */
    +static int lm8323_read_id(struct lm8323_chip *lm, u8 *buf)
    +{
    + int bytes;
    +
    + bytes = lm8323_read(lm, LM8323_CMD_READ_ID, buf, 2);
    + if (unlikely(bytes != 2))
    + return -EIO;
    +
    + return 0;
    +}
    +
    +static void lm8323_write_pwm_one(struct lm8323_pwm *pwm, int pos, u16 cmd)
    +{
    + struct lm8323_chip *lm = pwm_to_lm8323(pwm);
    +
    + lm8323_write(lm, 4, LM8323_CMD_PWM_WRITE, (pos << 2) | pwm->id,
    + (cmd & 0xff00) >> 8, cmd & 0x00ff);
    +}
    +
    +/*
    + * Write a script into a given PWM engine, concluding with PWM_END.
    + * If 'kill' is nonzero, the engine will be shut down at the end
    + * of the script, producing a zero output. Otherwise the engine
    + * will be kept running at the final PWM level indefinitely.
    + */
    +static void lm8323_write_pwm(struct lm8323_pwm *pwm, int kill,
    + int len, const u16 *cmds)
    +{
    + struct lm8323_chip *lm = pwm_to_lm8323(pwm);
    + int i;
    +
    + for (i = 0; i < len; i++)
    + lm8323_write_pwm_one(pwm, i, cmds[i]);
    +
    + lm8323_write_pwm_one(pwm, i++, PWM_END(kill));
    + lm8323_write(lm, 2, LM8323_CMD_START_PWM, pwm->id);
    + pwm->running = 1;
    +}
    +
    +static void lm8323_pwm_work(struct work_struct *work)
    +{
    + struct lm8323_pwm *pwm = work_to_pwm(work);
    + int div512, perstep, steps, hz, up, kill;
    + u16 pwm_cmds[3];
    + int num_cmds = 0;
    +
    + mutex_lock(&pwm->lock);
    +
    + /*
    + * Do nothing if we're already at the requested level,
    + * or previous setting is not yet complete. In the latter
    + * case we will be called again when the previous PWM script
    + * finishes.
    + */
    + if (pwm->running || pwm->desired_brightness == pwm->brightness) {
    + mutex_unlock(&pwm->lock);
    + return;
    + }
    +
    + kill = (pwm->desired_brightness == 0);
    + up = (pwm->desired_brightness > pwm->brightness);
    + steps = abs(pwm->desired_brightness - pwm->brightness);
    +
    + /*
    + * Convert time (in ms) into a divisor (512 or 16 on a refclk of
    + * 32768Hz), and number of ticks per step.
    + */
    + if ((pwm->fade_time / steps) > (32768 / 512)) {
    + div512 = 1;
    + hz = 32768 / 512;
    + }
    + else {
    + div512 = 0;
    + hz = 32768 / 16;
    + }
    +
    + perstep = (hz * pwm->fade_time) / (steps * 1000);
    +
    + if (perstep == 0)
    + perstep = 1;
    + else if (perstep > 63)
    + perstep = 63;
    +
    + while (steps) {
    + int s;
    +
    + s = min(126, steps);
    + pwm_cmds[num_cmds++] = PWM_RAMP(div512, perstep, s, up);
    + steps -= s;
    + }
    +
    + lm8323_write_pwm(pwm, kill, num_cmds, pwm_cmds);
    +
    + pwm->brightness = pwm->desired_brightness;
    + mutex_unlock(&pwm->lock);
    +}
    +
    +static void lm8323_pwm_set_brightness(struct led_classdev *led_cdev,
    + enum led_brightness brightness)
    +{
    + struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
    + struct lm8323_chip *lm = pwm_to_lm8323(pwm);
    +
    + mutex_lock(&pwm->lock);
    + pwm->desired_brightness = brightness;
    + mutex_unlock(&pwm->lock);
    +
    + if (in_interrupt()) {
    + schedule_work(&pwm->work);
    + } else {
    + /*
    + * Schedule PWM work as usual unless we are going into suspend
    + */
    + mutex_lock(&lm->lock);
    + if (likely(!lm->pm_suspend))
    + schedule_work(&pwm->work);
    + else
    + lm8323_pwm_work(&pwm->work);
    + mutex_unlock(&lm->lock);
    + }
    +}
    +
    +static ssize_t lm8323_pwm_show_time(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + struct led_classdev *led_cdev = dev_get_drvdata(dev);
    + struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
    +
    + return sprintf(buf, "%d\n", pwm->fade_time);
    +}
    +
    +static ssize_t lm8323_pwm_store_time(struct device *dev,
    + struct device_attribute *attr, const char *buf, size_t len)
    +{
    + struct led_classdev *led_cdev = dev_get_drvdata(dev);
    + struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
    + int ret;
    + int time;
    +
    + ret = sscanf(buf, "%d", &time);
    + /* Numbers only, please. */
    + if (ret)
    + return -EINVAL;
    +
    + pwm->fade_time = time;
    +
    + return strlen(buf);
    +}
    +static DEVICE_ATTR(time, 0644, lm8323_pwm_show_time, lm8323_pwm_store_time);
    +
    +static int init_pwm(struct lm8323_chip *lm, int id, struct device *dev,
    + const char *name)
    +{
    + struct lm8323_pwm *pwm = NULL;
    +
    + BUG_ON(id > 3);
    +
    + switch (id) {
    + case 1:
    + pwm = &lm->pwm1;
    + break;
    + case 2:
    + pwm = &lm->pwm2;
    + break;
    + case 3:
    + pwm = &lm->pwm3;
    + break;
    + }
    +
    + pwm->id = id;
    + pwm->fade_time = 0;
    + pwm->brightness = 0;
    + pwm->desired_brightness = 0;
    + pwm->running = 0;
    + mutex_init(&pwm->lock);
    + if (name) {
    + pwm->cdev.name = name;
    + pwm->cdev.brightness_set = lm8323_pwm_set_brightness;
    + if (led_classdev_register(dev, &pwm->cdev) < 0) {
    + dev_err(dev, "couldn't register PWM %d\n", id);
    + return -1;
    + }
    + if (device_create_file(pwm->cdev.dev,
    + &dev_attr_time) < 0) {
    + dev_err(dev, "couldn't register time attribute\n");
    + led_classdev_unregister(&pwm->cdev);
    + return -1;
    + }
    + INIT_WORK(&pwm->work, lm8323_pwm_work);
    + pwm->enabled = 1;
    + } else {
    + pwm->enabled = 0;
    + }
    +
    + return 0;
    +}
    +
    +static struct i2c_driver lm8323_i2c_driver;
    +
    +static ssize_t lm8323_show_disable(struct device *dev,
    + struct device_attribute *attr, char *buf)
    +{
    + struct lm8323_chip *lm = dev_get_drvdata(dev);
    +
    + return sprintf(buf, "%u\n", !lm->kp_enabled);
    +}
    +
    +static ssize_t lm8323_set_disable(struct device *dev,
    + struct device_attribute *attr,
    + const char *buf, size_t count)
    +{
    + struct lm8323_chip *lm = dev_get_drvdata(dev);
    + int ret;
    + int i;
    +
    + i = sscanf(buf, "%d", &ret);
    +
    + mutex_lock(&lm->lock);
    + lm->kp_enabled = !i;
    + mutex_unlock(&lm->lock);
    +
    + return count;
    +}
    +static DEVICE_ATTR(disable_kp, 0644, lm8323_show_disable, lm8323_set_disable);
    +
    +static int lm8323_probe(struct i2c_client *client,
    + const struct i2c_device_id *id)
    +{
    + struct lm8323_platform_data *pdata;
    + struct input_dev *idev;
    + struct lm8323_chip *lm;
    + int i, err = 0;
    + unsigned long tmo;
    + u8 data[2];
    +
    + lm = kzalloc(sizeof *lm, GFP_KERNEL);
    + if (!lm)
    + return -ENOMEM;
    +
    + i2c_set_clientdata(client, lm);
    + lm->client = client;
    + pdata = client->dev.platform_data;
    + if (!pdata || !pdata->size_x || !pdata->size_y) {
    + dev_err(&client->dev, "missing platform_data\n");
    + err = -EINVAL;
    + goto fail2;
    + }
    +
    + lm->size_x = pdata->size_x;
    + if (lm->size_x > 8) {
    + dev_err(&client->dev, "invalid x size %d specified\n",
    + lm->size_x);
    + err = -EINVAL;
    + goto fail2;
    + }
    +
    + lm->size_y = pdata->size_y;
    + if (lm->size_y > 12) {
    + dev_err(&client->dev, "invalid y size %d specified\n",
    + lm->size_y);
    + err = -EINVAL;
    + goto fail2;
    + }
    +
    + dev_vdbg(&client->dev, "Keypad size: %d x %d\n", lm->size_x, lm->size_y);
    +
    + lm->debounce_time = pdata->debounce_time;
    + lm->active_time = pdata->active_time;
    +
    + lm8323_reset(lm);
    +
    + /* Nothing's set up to service the IRQ yet, so just spin for max.
    + * 100ms until we can configure. */
    + tmo = jiffies + msecs_to_jiffies(100);
    + while (lm8323_read(lm, LM8323_CMD_READ_INT, data, 1) == 1) {
    + if (data[0] & INT_NOINIT)
    + break;
    +
    + if (time_after(jiffies, tmo)) {
    + dev_err(&client->dev,
    + "timeout waiting for initialisation\n");
    + break;
    + }
    +
    + msleep(1);
    + }
    + lm8323_configure(lm);
    +
    + /* If a true probe check the device */
    + if (lm8323_read_id(lm, data) != 0) {
    + dev_err(&client->dev, "device not found\n");
    + err = -ENODEV;
    + goto fail2;
    + }
    +
    + if (init_pwm(lm, 1, &client->dev, pdata->pwm1_name) < 0)
    + goto fail3;
    + if (init_pwm(lm, 2, &client->dev, pdata->pwm2_name) < 0)
    + goto fail4;
    + if (init_pwm(lm, 3, &client->dev, pdata->pwm3_name) < 0)
    + goto fail5;
    +
    + mutex_init(&lm->lock);
    + INIT_WORK(&lm->work, lm8323_work);
    +
    + err = request_irq(client->irq, lm8323_irq,
    + IRQF_TRIGGER_FALLING | IRQF_DISABLED |
    + IRQF_SAMPLE_RANDOM, "lm8323", lm);
    + if (err) {
    + dev_err(&client->dev, "could not get IRQ %d\n", client->irq);
    + goto fail6;
    + }
    +
    + set_irq_wake(client->irq, 1);
    +
    + lm->kp_enabled = 1;
    + err = device_create_file(&client->dev, &dev_attr_disable_kp);
    + if (err < 0)
    + goto fail7;
    +
    + idev = input_allocate_device();
    + if (!idev) {
    + err = -ENOMEM;
    + goto fail8;
    + }
    +
    + if (pdata->name)
    + idev->name = pdata->name;
    + else
    + idev->name = "LM8323 keypad";
    + snprintf(lm->phys, sizeof(lm->phys), "%s/input-kp", client->dev.bus_id);
    + idev->phys = lm->phys;
    +
    + lm->keys_down = 0;
    + idev->evbit[0] = BIT(EV_KEY);
    + for (i = 0; i < LM8323_KEYMAP_SIZE; i++) {
    + if (pdata->keymap[i] > 0)
    + set_bit(pdata->keymap[i], idev->keybit);
    +
    + lm->keymap[i] = pdata->keymap[i];
    + }
    +
    + if (pdata->repeat)
    + set_bit(EV_REP, idev->evbit);
    +
    + lm->idev = idev;
    + err = input_register_device(idev);
    + if (err) {
    + dev_dbg(&client->dev, "error registering input device\n");
    + goto fail8;
    + }
    +
    + return 0;
    +
    +fail8:
    + device_remove_file(&client->dev, &dev_attr_disable_kp);
    +fail7:
    + free_irq(client->irq, lm);
    +fail6:
    + if (lm->pwm3.enabled)
    + led_classdev_unregister(&lm->pwm3.cdev);
    +fail5:
    + if (lm->pwm2.enabled)
    + led_classdev_unregister(&lm->pwm2.cdev);
    +fail4:
    + if (lm->pwm1.enabled)
    + led_classdev_unregister(&lm->pwm1.cdev);
    +fail3:
    +fail2:
    + kfree(lm);
    + return err;
    +}
    +
    +static int lm8323_remove(struct i2c_client *client)
    +{
    + struct lm8323_chip *lm = i2c_get_clientdata(client);
    +
    + free_irq(client->irq, lm);
    + cancel_work_sync(&lm->work);
    + input_unregister_device(lm->idev);
    + device_remove_file(&lm->client->dev, &dev_attr_disable_kp);
    + if (lm->pwm3.enabled)
    + led_classdev_unregister(&lm->pwm3.cdev);
    + if (lm->pwm2.enabled)
    + led_classdev_unregister(&lm->pwm2.cdev);
    + if (lm->pwm1.enabled)
    + led_classdev_unregister(&lm->pwm1.cdev);
    + kfree(lm);
    +
    + return 0;
    +}
    +
    +/*
    + * We don't need to explicitly suspend the chip, as it already switches off
    + * when there's no activity.
    + */
    +static int lm8323_suspend(struct i2c_client *client, pm_message_t mesg)
    +{
    + struct lm8323_chip *lm = i2c_get_clientdata(client);
    +
    + set_irq_wake(client->irq, 0);
    + disable_irq(client->irq);
    +
    + mutex_lock(&lm->lock);
    + lm->pm_suspend = 1;
    + mutex_unlock(&lm->lock);
    +
    + if (lm->pwm1.enabled)
    + led_classdev_suspend(&lm->pwm1.cdev);
    + if (lm->pwm2.enabled)
    + led_classdev_suspend(&lm->pwm2.cdev);
    + if (lm->pwm3.enabled)
    + led_classdev_suspend(&lm->pwm3.cdev);
    +
    + return 0;
    +}
    +
    +static int lm8323_resume(struct i2c_client *client)
    +{
    + struct lm8323_chip *lm = i2c_get_clientdata(client);
    +
    + mutex_lock(&lm->lock);
    + lm->pm_suspend = 0;
    + mutex_unlock(&lm->lock);
    +
    + if (lm->pwm1.enabled)
    + led_classdev_resume(&lm->pwm1.cdev);
    + if (lm->pwm2.enabled)
    + led_classdev_resume(&lm->pwm2.cdev);
    + if (lm->pwm3.enabled)
    + led_classdev_resume(&lm->pwm3.cdev);
    +
    + enable_irq(client->irq);
    + set_irq_wake(client->irq, 1);
    +
    + return 0;
    +}
    +
    +static const struct i2c_device_id lm8323_id[] = {
    + { "lm8323", 0 },
    + { }
    +};
    +
    +static struct i2c_driver lm8323_i2c_driver = {
    + .driver = {
    + .name = "lm8323",
    + },
    + .probe = lm8323_probe,
    + .remove = lm8323_remove,
    + .suspend = lm8323_suspend,
    + .resume = lm8323_resume,
    + .id_table = lm8323_id,
    +};
    +MODULE_DEVICE_TABLE(i2c, lm8323_id);
    +
    +static int __init lm8323_init(void)
    +{
    + return i2c_add_driver(&lm8323_i2c_driver);
    +}
    +module_init(lm8323_init);
    +
    +static void __exit lm8323_exit(void)
    +{
    + i2c_del_driver(&lm8323_i2c_driver);
    +}
    +module_exit(lm8323_exit);
    +
    +MODULE_AUTHOR("Timo O. Karjalainen <timo.o.karjalainen@nokia.com>, Daniel Stone");
    +MODULE_DESCRIPTION("LM8323 keypad driver");
    +MODULE_LICENSE("GPL");
    +
    diff --git a/include/linux/i2c/lm8323.h b/include/linux/i2c/lm8323.h
    new file mode 100644
    index 0000000..5eae5cc
    --- /dev/null
    +++ b/include/linux/i2c/lm8323.h
    @@ -0,0 +1,35 @@
    +/*
    + * include/lm8323.h
    + *
    + * Configuration for LM8323 keypad driver.
    + */
    +
    +#ifndef __LINUX_LM8323_H
    +#define __LINUX_LM8323_H
    +
    +#include <linux/types.h>
    +
    +/*
    + * Largest keycode that the chip can send, plus one,
    + * so keys can be mapped directly at the index of the
    + * LM8323 keycode instead of subtracting one.
    + */
    +#define LM8323_KEYMAP_SIZE (0x7f + 1)
    +
    +struct lm8323_platform_data {
    + int debounce_time; /* Time to watch for key bouncing, in ms. */
    + int active_time; /* Idle time until sleep, in ms. */
    +
    + int size_x;
    + int size_y;
    + int repeat : 1;
    + const s16 *keymap;
    +
    + char *pwm1_name; /* Device name for PWM1. */
    + char *pwm2_name; /* Device name for PWM2. */
    + char *pwm3_name; /* Device name for PWM3. */
    +
    + char *name; /* Device name. */
    +};
    +
    +#endif /* __LINUX_LM8323_H */
    --
    1.6.1.3


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