--- /dev/null
+/*
+ * leds-tca6507
+ *
+ * The TCA6507 is a programmable LED controller that can drive 7
+ * separate lines either by holding them low, or by pulsing them
+ * with modulated width.
+ * The modulation can be varied in a simple pattern to produce a blink or
+ * double-blink.
+ *
+ * This driver can configure each line either as a 'GPIO' which is out-only
+ * (no pull-up) or as an LED with variable brightness and hardware-assisted
+ * blinking.
+ *
+ * Apart from OFF and ON there are three programmable brightness levels which
+ * can be programmed from 0 to 15 and indicate how many 500usec intervals in
+ * each 8msec that the led is 'on'. The levels are named MASTER, BANK0 and
+ * BANK1.
+ *
+ * There are two different blink rates that can be programmed, each with
+ * separate time for rise, on, fall, off and second-off. Thus if 3 or more
+ * different non-trivial rates are required, software must be used for the extra
+ * rates. The two different blink rates must align with the two levels BANK0 and
+ * BANK1.
+ * This driver does not support double-blink so 'second-off' always matches
+ * 'off'.
+ *
+ * Only 16 different times can be programmed in a roughly logarithmic scale from
+ * 64ms to 16320ms. To be precise the possible times are:
+ * 0, 64, 128, 192, 256, 384, 512, 768,
+ * 1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320
+ *
+ * Times that cannot be closely matched with these must be
+ * handled in software. This driver allows 12.5% error in matching.
+ *
+ * This driver does not allow rise/fall rates to be set explicitly. When trying
+ * to match a given 'on' or 'off' period, an appropriate pair of 'change' and
+ * 'hold' times are chosen to get a close match. If the target delay is even,
+ * the 'change' number will be the smaller; if odd, the 'hold' number will be
+ * the smaller.
+
+ * Choosing pairs of delays with 12.5% errors allows us to match delays in the
+ * ranges: 56-72, 112-144, 168-216, 224-27504, 28560-36720.
+ * 26% of the achievable sums can be matched by multiple pairings. For example
+ * 1536 == 1536+0, 1024+512, or 768+768. This driver will always choose the
+ * pairing with the least maximum - 768+768 in this case. Other pairings are
+ * not available.
+ *
+ * Access to the 3 levels and 2 blinks are on a first-come, first-served basis.
+ * Access can be shared by multiple leds if they have the same level and
+ * either same blink rates, or some don't blink.
+ * When a led changes, it relinquishes access and tries again, so it might
+ * lose access to hardware blink.
+ * If a blink engine cannot be allocated, software blink is used.
+ * If the desired brightness cannot be allocated, the closest available non-zero
+ * brightness is used. As 'full' is always available, the worst case would be
+ * to have two different blink rates at '1', with Max at '2', then other leds
+ * will have to choose between '2' and '16'. Hopefully this is not likely.
+ *
+ * Each bank (BANK0 and BANK1) has two usage counts - LEDs using the brightness
+ * and LEDs using the blink. It can only be reprogrammed when the appropriate
+ * counter is zero. The MASTER level has a single usage count.
+ *
+ * Each Led has programmable 'on' and 'off' time as milliseconds. With each
+ * there is a flag saying if it was explicitly requested or defaulted.
+ * Similarly the banks know if each time was explicit or a default. Defaults
+ * are permitted to be changed freely - they are not recognised when matching.
+ *
+ *
+ * An led-tca6507 device must be provided with platform data. This data
+ * lists for each output: the name, default trigger, and whether the signal
+ * is being used as a GPiO rather than an led. 'struct led_plaform_data'
+ * is used for this. If 'name' is NULL, the output isn't used. If 'flags'
+ * is TCA6507_MAKE_CPIO, the output is a GPO.
+ * The "struct led_platform_data" can be embedded in a
+ * "struct tca6507_platform_data" which adds a 'gpio_base' for the GPiOs,
+ * and a 'setup' callback which is called once the GPiOs are available.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/workqueue.h>
+#include <linux/leds-tca6507.h>
+
+/* LED select registers determine the source that drives LED outputs */
+#define TCA6507_LS_LED_OFF 0x0 /* Output HI-Z (off) */
+#define TCA6507_LS_LED_OFF1 0x1 /* Output HI-Z (off) - not used */
+#define TCA6507_LS_LED_PWM0 0x2 /* Output LOW with Bank0 rate */
+#define TCA6507_LS_LED_PWM1 0x3 /* Output LOW with Bank1 rate */
+#define TCA6507_LS_LED_ON 0x4 /* Output LOW (on) */
+#define TCA6507_LS_LED_MIR 0x5 /* Output LOW with Master Intensity */
+#define TCA6507_LS_BLINK0 0x6 /* Blink at Bank0 rate */
+#define TCA6507_LS_BLINK1 0x7 /* Blink at Bank1 rate */
+
+enum {
+ BANK0,
+ BANK1,
+ MASTER,
+};
+static int bank_source[3] = {
+ TCA6507_LS_LED_PWM0,
+ TCA6507_LS_LED_PWM1,
+ TCA6507_LS_LED_MIR,
+};
+static int blink_source[2] = {
+ TCA6507_LS_BLINK0,
+ TCA6507_LS_BLINK1,
+};
+
+/* PWM registers */
+#define TCA6507_REG_CNT 11
+
+/*
+ * 0x00, 0x01, 0x02 encode the TCA6507_LS_* values, each output
+ * owns one bit in each register
+ */
+#define TCA6507_FADE_ON 0x03
+#define TCA6507_FULL_ON 0x04
+#define TCA6507_FADE_OFF 0x05
+#define TCA6507_FIRST_OFF 0x06
+#define TCA6507_SECOND_OFF 0x07
+#define TCA6507_MAX_INTENSITY 0x08
+#define TCA6507_MASTER_INTENSITY 0x09
+#define TCA6507_INITIALIZE 0x0A
+
+#define INIT_CODE 0x8
+
+#define TIMECODES 16
+static int time_codes[TIMECODES] = {
+ 0, 64, 128, 192, 256, 384, 512, 768,
+ 1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320
+};
+
+/* Convert an led.brightness level (0..255) to a TCA6507 level (0..15) */
+static inline int TO_LEVEL(int brightness)
+{
+ return brightness >> 4;
+}
+
+/* ...and convert back */
+static inline int TO_BRIGHT(int level)
+{
+ if (level)
+ return (level << 4) | 0xf;
+ return 0;
+}
+
+#define NUM_LEDS 7
+struct tca6507_chip {
+ int reg_set; /* One bit per register where
+ * a '1' means the register
+ * should be written */
+ u8 reg_file[TCA6507_REG_CNT];
+ /* Bank 2 is Master Intensity and doesn't use times */
+ struct bank {
+ int level;
+ int ontime, offtime;
+ int on_dflt, off_dflt;
+ int time_use, level_use;
+ } bank[3];
+ struct i2c_client *client;
+ struct work_struct work;
+ spinlock_t lock;
+
+ struct tca6507_led {
+ struct tca6507_chip *chip;
+ struct led_classdev led_cdev;
+ int num;
+ int ontime, offtime;
+ int on_dflt, off_dflt;
+ int bank; /* Bank used, or -1 */
+ int blink; /* Set if hardware-blinking */
+ } leds[NUM_LEDS];
+#ifdef CONFIG_GPIOLIB
+ struct gpio_chip gpio;
+ const char *gpio_name[NUM_LEDS];
+ int gpio_map[NUM_LEDS];
+#endif
+};
+
+static const struct i2c_device_id tca6507_id[] = {
+ { "tca6507" },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tca6507_id);
+
+static int choose_times(int msec, int *c1p, int *c2p)
+{
+ /*
+ * Choose two timecodes which add to 'msec' as near as possible.
+ * The first returned is the 'on' or 'off' time. The second is to be
+ * used as a 'fade-on' or 'fade-off' time. If 'msec' is even,
+ * the first will not be smaller than the second. If 'msec' is odd,
+ * the first will not be larger than the second.
+ * If we cannot get a sum within 1/8 of 'msec' fail with -EINVAL,
+ * otherwise return the sum that was achieved, plus 1 if the first is
+ * smaller.
+ * If two possibilities are equally good (e.g. 512+0, 256+256), choose
+ * the first pair so there is more change-time visible (i.e. it is
+ * softer).
+ */
+ int c1, c2;
+ int tmax = msec * 9 / 8;
+ int tmin = msec * 7 / 8;
+ int diff = 65536;
+
+ /* We start at '1' to ensure we never even think of choosing a
+ * total time of '0'.
+ */
+ for (c1 = 1; c1 < TIMECODES; c1++) {
+ int t = time_codes[c1];
+ if (t*2 < tmin)
+ continue;
+ if (t > tmax)
+ break;
+ for (c2 = 0; c2 <= c1; c2++) {
+ int tt = t + time_codes[c2];
+ int d;
+ if (tt < tmin)
+ continue;
+ if (tt > tmax)
+ break;
+ /* This works! */
+ d = abs(msec - tt);
+ if (d >= diff)
+ continue;
+ /* Best yet */
+ *c1p = c1;
+ *c2p = c2;
+ diff = d;
+ if (d == 0)
+ return msec;
+ }
+ }
+ if (diff < 65536) {
+ int actual;
+ if (msec & 1) {
+ c1 = *c2p;
+ *c2p = *c1p;
+ *c1p = c1;
+ }
+ actual = time_codes[*c1p] + time_codes[*c2p];
+ if (*c1p < *c2p)
+ return actual + 1;
+ else
+ return actual;
+ }
+ /* No close match */
+ return -EINVAL;
+}
+
+/*
+ * Update the register file with the appropriate 3-bit state for
+ * the given led.
+ */
+static void set_select(struct tca6507_chip *tca, int led, int val)
+{
+ int mask = (1 << led);
+ int bit;
+
+ for (bit = 0; bit < 3; bit++) {
+ int n = tca->reg_file[bit] & ~mask;
+ if (val & (1 << bit))
+ n |= mask;
+ if (tca->reg_file[bit] != n) {
+ tca->reg_file[bit] = n;
+ tca->reg_set |= (1 << bit);
+ }
+ }
+}
+
+/* Update the register file with the appropriate 4-bit code for
+ * one bank or other. This can be used for timers, for levels, or
+ * for initialisation.
+ */
+static void set_code(struct tca6507_chip *tca, int reg, int bank, int new)
+{
+ int mask = 0xF;
+ int n;
+ if (bank) {
+ mask <<= 4;
+ new <<= 4;
+ }
+ n = tca->reg_file[reg] & ~mask;
+ n |= new;
+ if (tca->reg_file[reg] != n) {
+ tca->reg_file[reg] = n;
+ tca->reg_set |= 1 << reg;
+ }
+}
+
+/* Update brightness level. */
+static void set_level(struct tca6507_chip *tca, int bank, int level)
+{
+ switch (bank) {
+ case BANK0:
+ case BANK1:
+ set_code(tca, TCA6507_MAX_INTENSITY, bank, level);
+ break;
+ case MASTER:
+ set_code(tca, TCA6507_MASTER_INTENSITY, 0, level);
+ break;
+ }
+ tca->bank[bank].level = level;
+}
+
+/* Record all relevant time code for a given bank */
+static void set_times(struct tca6507_chip *tca, int bank)
+{
+ int c1, c2;
+ int result;
+
+ result = choose_times(tca->bank[bank].ontime, &c1, &c2);
+ dev_dbg(&tca->client->dev,
+ "Chose on times %d(%d) %d(%d) for %dms\n", c1, time_codes[c1],
+ c2, time_codes[c2], tca->bank[bank].ontime);
+ set_code(tca, TCA6507_FADE_ON, bank, c2);
+ set_code(tca, TCA6507_FULL_ON, bank, c1);
+ tca->bank[bank].ontime = result;
+
+ result = choose_times(tca->bank[bank].offtime, &c1, &c2);
+ dev_dbg(&tca->client->dev,
+ "Chose off times %d(%d) %d(%d) for %dms\n", c1, time_codes[c1],
+ c2, time_codes[c2], tca->bank[bank].offtime);
+ set_code(tca, TCA6507_FADE_OFF, bank, c2);
+ set_code(tca, TCA6507_FIRST_OFF, bank, c1);
+ set_code(tca, TCA6507_SECOND_OFF, bank, c1);
+ tca->bank[bank].offtime = result;
+
+ set_code(tca, TCA6507_INITIALIZE, bank, INIT_CODE);
+}
+
+/* Write all needed register of tca6507 */
+
+static void tca6507_work(struct work_struct *work)
+{
+ struct tca6507_chip *tca = container_of(work, struct tca6507_chip,
+ work);
+ struct i2c_client *cl = tca->client;
+ int set;
+ u8 file[TCA6507_REG_CNT];
+ int r;
+
+ spin_lock_irq(&tca->lock);
+ set = tca->reg_set;
+ memcpy(file, tca->reg_file, TCA6507_REG_CNT);
+ tca->reg_set = 0;
+ spin_unlock_irq(&tca->lock);
+
+ for (r = 0; r < TCA6507_REG_CNT; r++)
+ if (set & (1<<r))
+ i2c_smbus_write_byte_data(cl, r, file[r]);
+}
+
+static void led_release(struct tca6507_led *led)
+{
+ /* If led owns any resource, release it. */
+ struct tca6507_chip *tca = led->chip;
+ if (led->bank >= 0) {
+ struct bank *b = tca->bank + led->bank;
+ if (led->blink)
+ b->time_use--;
+ b->level_use--;
+ }
+ led->blink = 0;
+ led->bank = -1;
+}
+
+static int led_prepare(struct tca6507_led *led)
+{
+ /* Assign this led to a bank, configuring that bank if necessary. */
+ int level = TO_LEVEL(led->led_cdev.brightness);
+ struct tca6507_chip *tca = led->chip;
+ int c1, c2;
+ int i;
+ struct bank *b;
+ int need_init = 0;
+
+ led->led_cdev.brightness = TO_BRIGHT(level);
+ if (level == 0) {
+ set_select(tca, led->num, TCA6507_LS_LED_OFF);
+ return 0;
+ }
+
+ if (led->ontime == 0 || led->offtime == 0) {
+ /*
+ * Just set the brightness, choosing first usable bank.
+ * If none perfect, choose best.
+ * Count backwards so we check MASTER bank first
+ * to avoid wasting a timer.
+ */
+ int best = -1;/* full-on */
+ int diff = 15-level;
+
+ if (level == 15) {
+ set_select(tca, led->num, TCA6507_LS_LED_ON);
+ return 0;
+ }
+
+ for (i = MASTER; i >= BANK0; i--) {
+ int d;
+ if (tca->bank[i].level == level ||
+ tca->bank[i].level_use == 0) {
+ best = i;
+ break;
+ }
+ d = abs(level - tca->bank[i].level);
+ if (d < diff) {
+ diff = d;
+ best = i;
+ }
+ }
+ if (best == -1) {
+ /* Best brightness is full-on */
+ set_select(tca, led->num, TCA6507_LS_LED_ON);
+ led->led_cdev.brightness = LED_FULL;
+ return 0;
+ }
+
+ if (!tca->bank[best].level_use)
+ set_level(tca, best, level);
+
+ tca->bank[best].level_use++;
+ led->bank = best;
+ set_select(tca, led->num, bank_source[best]);
+ led->led_cdev.brightness = TO_BRIGHT(tca->bank[best].level);
+ return 0;
+ }
+
+ /*
+ * We have on/off time so we need to try to allocate a timing bank.
+ * First check if times are compatible with hardware and give up if
+ * not.
+ */
+ if (choose_times(led->ontime, &c1, &c2) < 0)
+ return -EINVAL;
+ if (choose_times(led->offtime, &c1, &c2) < 0)
+ return -EINVAL;
+
+ for (i = BANK0; i <= BANK1; i++) {
+ if (tca->bank[i].level_use == 0)
+ /* not in use - it is ours! */
+ break;
+ if (tca->bank[i].level != level)
+ /* Incompatible level - skip */
+ /* FIX: if timer matches we maybe should consider
+ * this anyway...
+ */
+ continue;
+
+ if (tca->bank[i].time_use == 0)
+ /* Timer not in use, and level matches - use it */
+ break;
+
+ if (!(tca->bank[i].on_dflt ||
+ led->on_dflt ||
+ tca->bank[i].ontime == led->ontime))
+ /* on time is incompatible */
+ continue;
+
+ if (!(tca->bank[i].off_dflt ||
+ led->off_dflt ||
+ tca->bank[i].offtime == led->offtime))
+ /* off time is incompatible */
+ continue;
+
+ /* looks like a suitable match */
+ break;
+ }
+
+ if (i > BANK1)
+ /* Nothing matches - how sad */
+ return -EINVAL;
+
+ b = &tca->bank[i];
+ if (b->level_use == 0)
+ set_level(tca, i, level);
+ b->level_use++;
+ led->bank = i;
+
+ if (b->on_dflt ||
+ !led->on_dflt ||
+ b->time_use == 0) {
+ b->ontime = led->ontime;
+ b->on_dflt = led->on_dflt;
+ need_init = 1;
+ }
+
+ if (b->off_dflt ||
+ !led->off_dflt ||
+ b->time_use == 0) {
+ b->offtime = led->offtime;
+ b->off_dflt = led->off_dflt;
+ need_init = 1;
+ }
+
+ if (need_init)
+ set_times(tca, i);
+
+ led->ontime = b->ontime;
+ led->offtime = b->offtime;
+
+ b->time_use++;
+ led->blink = 1;
+ led->led_cdev.brightness = TO_BRIGHT(b->level);
+ set_select(tca, led->num, blink_source[i]);
+ return 0;
+}
+
+static int led_assign(struct tca6507_led *led)
+{
+ struct tca6507_chip *tca = led->chip;
+ int err;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tca->lock, flags);
+ led_release(led);
+ err = led_prepare(led);
+ if (err) {
+ /*
+ * Can only fail on timer setup. In that case we need to
+ * re-establish as steady level.
+ */
+ led->ontime = 0;
+ led->offtime = 0;
+ led_prepare(led);
+ }
+ spin_unlock_irqrestore(&tca->lock, flags);
+
+ if (tca->reg_set)
+ schedule_work(&tca->work);
+ return err;
+}
+
+static void tca6507_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct tca6507_led *led = container_of(led_cdev, struct tca6507_led,
+ led_cdev);
+ led->led_cdev.brightness = brightness;
+ led->ontime = 0;
+ led->offtime = 0;
+ led_assign(led);
+}
+
+static int tca6507_blink_set(struct led_classdev *led_cdev,
+ unsigned long *delay_on,
+ unsigned long *delay_off)
+{
+ struct tca6507_led *led = container_of(led_cdev, struct tca6507_led,
+ led_cdev);
+
+ if (*delay_on == 0)
+ led->on_dflt = 1;
+ else if (delay_on != &led_cdev->blink_delay_on)
+ led->on_dflt = 0;
+ led->ontime = *delay_on;
+
+ if (*delay_off == 0)
+ led->off_dflt = 1;
+ else if (delay_off != &led_cdev->blink_delay_off)
+ led->off_dflt = 0;
+ led->offtime = *delay_off;
+
+ if (led->ontime == 0)
+ led->ontime = 512;
+ if (led->offtime == 0)
+ led->offtime = 512;
+
+ if (led->led_cdev.brightness == LED_OFF)
+ led->led_cdev.brightness = LED_FULL;
+ if (led_assign(led) < 0) {
+ led->ontime = 0;
+ led->offtime = 0;
+ led->led_cdev.brightness = LED_OFF;
+ return -EINVAL;
+ }
+ *delay_on = led->ontime;
+ *delay_off = led->offtime;
+ return 0;
+}
+
+#ifdef CONFIG_GPIOLIB
+static void tca6507_gpio_set_value(struct gpio_chip *gc,
+ unsigned offset, int val)
+{
+ struct tca6507_chip *tca = container_of(gc, struct tca6507_chip, gpio);
+ unsigned long flags;
+
+ spin_lock_irqsave(&tca->lock, flags);
+ /*
+ * 'OFF' is floating high, and 'ON' is pulled down, so it has the
+ * inverse sense of 'val'.
+ */
+ set_select(tca, tca->gpio_map[offset],
+ val ? TCA6507_LS_LED_OFF : TCA6507_LS_LED_ON);
+ spin_unlock_irqrestore(&tca->lock, flags);
+ if (tca->reg_set)
+ schedule_work(&tca->work);
+}
+
+static int tca6507_gpio_direction_output(struct gpio_chip *gc,
+ unsigned offset, int val)
+{
+ tca6507_gpio_set_value(gc, offset, val);
+ return 0;
+}
+
+static int tca6507_probe_gpios(struct i2c_client *client,
+ struct tca6507_chip *tca,
+ struct tca6507_platform_data *pdata)
+{
+ int err;
+ int i = 0;
+ int gpios = 0;
+
+ for (i = 0; i < NUM_LEDS; i++)
+ if (pdata->leds.leds[i].name && pdata->leds.leds[i].flags) {
+ /* Configure as a gpio */
+ tca->gpio_name[gpios] = pdata->leds.leds[i].name;
+ tca->gpio_map[gpios] = i;
+ gpios++;
+ }
+
+ if (!gpios)
+ return 0;
+
+ tca->gpio.label = "gpio-tca6507";
+ tca->gpio.names = tca->gpio_name;
+ tca->gpio.ngpio = gpios;
+ tca->gpio.base = pdata->gpio_base;
+ tca->gpio.owner = THIS_MODULE;
+ tca->gpio.direction_output = tca6507_gpio_direction_output;
+ tca->gpio.set = tca6507_gpio_set_value;
+ tca->gpio.dev = &client->dev;
+ err = gpiochip_add(&tca->gpio);
+ if (err) {
+ tca->gpio.ngpio = 0;
+ return err;
+ }
+ if (pdata->setup)
+ pdata->setup(tca->gpio.base, tca->gpio.ngpio);
+ return 0;
+}
+
+static void tca6507_remove_gpio(struct tca6507_chip *tca)
+{
+ if (tca->gpio.ngpio) {
+ int err = gpiochip_remove(&tca->gpio);
+ dev_err(&tca->client->dev, "%s failed, %d\n",
+ "gpiochip_remove()", err);
+ }
+}
+#else /* CONFIG_GPIOLIB */
+static int tca6507_probe_gpios(struct i2c_client *client,
+ struct tca6507_chip *tca,
+ struct tca6507_platform_data *pdata)
+{
+ return 0;
+}
+static void tca6507_remove_gpio(struct tca6507_chip *tca)
+{
+}
+#endif /* CONFIG_GPIOLIB */
+
+static int __devinit tca6507_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct tca6507_chip *tca;
+ struct i2c_adapter *adapter;
+ struct tca6507_platform_data *pdata;
+ int err;
+ int i = 0;
+
+ adapter = to_i2c_adapter(client->dev.parent);
+ pdata = client->dev.platform_data;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
+ return -EIO;
+
+ if (!pdata || pdata->leds.num_leds != NUM_LEDS) {
+ dev_err(&client->dev, "Need %d entries in platform-data list\n",
+ NUM_LEDS);
+ return -ENODEV;
+ }
+ err = -ENOMEM;
+ tca = kzalloc(sizeof(*tca), GFP_KERNEL);
+ if (!tca)
+ goto exit;
+
+ tca->client = client;
+ INIT_WORK(&tca->work, tca6507_work);
+ spin_lock_init(&tca->lock);
+ i2c_set_clientdata(client, tca);
+
+ for (i = 0; i < NUM_LEDS; i++) {
+ struct tca6507_led *l = tca->leds + i;
+
+ l->chip = tca;
+ l->num = i;
+ if (pdata->leds.leds[i].name && !pdata->leds.leds[i].flags) {
+ l->led_cdev.name = pdata->leds.leds[i].name;
+ l->led_cdev.default_trigger
+ = pdata->leds.leds[i].default_trigger;
+ l->led_cdev.brightness_set = tca6507_brightness_set;
+ l->led_cdev.blink_set = tca6507_blink_set;
+ l->bank = -1;
+ err = led_classdev_register(&client->dev,
+ &l->led_cdev);
+ if (err < 0)
+ goto exit;
+ }
+ }
+ err = tca6507_probe_gpios(client, tca, pdata);
+ if (err)
+ goto exit;
+ /* set all registers to known state - zero */
+ tca->reg_set = 0x7f;
+ schedule_work(&tca->work);
+
+ return 0;
+exit:
+ while (i--)
+ if (tca->leds[i].led_cdev.name)
+ led_classdev_unregister(&tca->leds[i].led_cdev);
+ cancel_work_sync(&tca->work);
+ i2c_set_clientdata(client, NULL);
+ kfree(tca);
+ return err;
+}
+
+static int __devexit tca6507_remove(struct i2c_client *client)
+{
+ int i;
+ struct tca6507_chip *tca = i2c_get_clientdata(client);
+ struct tca6507_led *tca_leds = tca->leds;
+
+ for (i = 0; i < NUM_LEDS; i++) {
+ if (tca_leds[i].led_cdev.name)
+ led_classdev_unregister(&tca_leds[i].led_cdev);
+ }
+ tca6507_remove_gpio(tca);
+ cancel_work_sync(&tca->work);
+ i2c_set_clientdata(client, NULL);
+ kfree(tca);
+
+ return 0;
+}
+
+static struct i2c_driver tca6507_driver = {
+ .driver = {
+ .name = "leds-tca6507",
+ .owner = THIS_MODULE,
+ },
+ .probe = tca6507_probe,
+ .remove = __devexit_p(tca6507_remove),
+ .id_table = tca6507_id,
+};
+
+static int __init tca6507_leds_init(void)
+{
+ return i2c_add_driver(&tca6507_driver);
+}
+
+static void __exit tca6507_leds_exit(void)
+{
+ i2c_del_driver(&tca6507_driver);
+}
+
+module_init(tca6507_leds_init);
+module_exit(tca6507_leds_exit);
+
+MODULE_AUTHOR("NeilBrown <neilb@suse.de>");
+MODULE_DESCRIPTION("TCA6507 LED/GPO driver");
+MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-exynos.git / commitdiff