#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
#include <linux/regmap.h>
+#include <linux/pm.h>
+#include <linux/delay.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#define SX9500_DRIVER_NAME "sx9500"
#define SX9500_IRQ_NAME "sx9500_event"
-#define SX9500_GPIO_NAME "sx9500_gpio"
+
+#define SX9500_GPIO_INT "interrupt"
+#define SX9500_GPIO_RESET "reset"
/* Register definitions. */
#define SX9500_REG_IRQ_SRC 0x00
#define SX9500_CONVDONE_IRQ BIT(3)
#define SX9500_PROXSTAT_SHIFT 4
+#define SX9500_COMPSTAT_MASK GENMASK(3, 0)
#define SX9500_NUM_CHANNELS 4
struct i2c_client *client;
struct iio_trigger *trig;
struct regmap *regmap;
+ struct gpio_desc *gpiod_rst;
/*
* Last reading of the proximity status for each channel. We
* only send an event to user space when this changes.
bool event_enabled[SX9500_NUM_CHANNELS];
bool trigger_enabled;
u16 *buffer;
+ /* Remember enabled channels and sample rate during suspend. */
+ unsigned int suspend_ctrl0;
+ struct completion completion;
+ int data_rdy_users, close_far_users;
+ int channel_users[SX9500_NUM_CHANNELS];
};
static const struct iio_event_spec sx9500_events[] = {
{2, 500000},
};
+static const unsigned int sx9500_scan_period_table[] = {
+ 30, 60, 90, 120, 150, 200, 300, 400,
+};
+
static const struct regmap_range sx9500_writable_reg_ranges[] = {
regmap_reg_range(SX9500_REG_IRQ_MSK, SX9500_REG_IRQ_MSK),
regmap_reg_range(SX9500_REG_PROX_CTRL0, SX9500_REG_PROX_CTRL8),
.volatile_table = &sx9500_volatile_regs,
};
-static int sx9500_read_proximity(struct sx9500_data *data,
+static int sx9500_inc_users(struct sx9500_data *data, int *counter,
+ unsigned int reg, unsigned int bitmask)
+{
+ (*counter)++;
+ if (*counter != 1)
+ /* Bit is already active, nothing to do. */
+ return 0;
+
+ return regmap_update_bits(data->regmap, reg, bitmask, bitmask);
+}
+
+static int sx9500_dec_users(struct sx9500_data *data, int *counter,
+ unsigned int reg, unsigned int bitmask)
+{
+ (*counter)--;
+ if (*counter != 0)
+ /* There are more users, do not deactivate. */
+ return 0;
+
+ return regmap_update_bits(data->regmap, reg, bitmask, 0);
+}
+
+static int sx9500_inc_chan_users(struct sx9500_data *data, int chan)
+{
+ return sx9500_inc_users(data, &data->channel_users[chan],
+ SX9500_REG_PROX_CTRL0, BIT(chan));
+}
+
+static int sx9500_dec_chan_users(struct sx9500_data *data, int chan)
+{
+ return sx9500_dec_users(data, &data->channel_users[chan],
+ SX9500_REG_PROX_CTRL0, BIT(chan));
+}
+
+static int sx9500_inc_data_rdy_users(struct sx9500_data *data)
+{
+ return sx9500_inc_users(data, &data->data_rdy_users,
+ SX9500_REG_IRQ_MSK, SX9500_CONVDONE_IRQ);
+}
+
+static int sx9500_dec_data_rdy_users(struct sx9500_data *data)
+{
+ return sx9500_dec_users(data, &data->data_rdy_users,
+ SX9500_REG_IRQ_MSK, SX9500_CONVDONE_IRQ);
+}
+
+static int sx9500_inc_close_far_users(struct sx9500_data *data)
+{
+ return sx9500_inc_users(data, &data->close_far_users,
+ SX9500_REG_IRQ_MSK,
+ SX9500_CLOSE_IRQ | SX9500_FAR_IRQ);
+}
+
+static int sx9500_dec_close_far_users(struct sx9500_data *data)
+{
+ return sx9500_dec_users(data, &data->close_far_users,
+ SX9500_REG_IRQ_MSK,
+ SX9500_CLOSE_IRQ | SX9500_FAR_IRQ);
+}
+
+static int sx9500_read_prox_data(struct sx9500_data *data,
const struct iio_chan_spec *chan,
int *val)
{
return IIO_VAL_INT;
}
+/*
+ * If we have no interrupt support, we have to wait for a scan period
+ * after enabling a channel to get a result.
+ */
+static int sx9500_wait_for_sample(struct sx9500_data *data)
+{
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0, &val);
+ if (ret < 0)
+ return ret;
+
+ val = (val & SX9500_SCAN_PERIOD_MASK) >> SX9500_SCAN_PERIOD_SHIFT;
+
+ msleep(sx9500_scan_period_table[val]);
+
+ return 0;
+}
+
+static int sx9500_read_proximity(struct sx9500_data *data,
+ const struct iio_chan_spec *chan,
+ int *val)
+{
+ int ret;
+
+ mutex_lock(&data->mutex);
+
+ ret = sx9500_inc_chan_users(data, chan->channel);
+ if (ret < 0)
+ goto out;
+
+ ret = sx9500_inc_data_rdy_users(data);
+ if (ret < 0)
+ goto out_dec_chan;
+
+ mutex_unlock(&data->mutex);
+
+ if (data->client->irq > 0)
+ ret = wait_for_completion_interruptible(&data->completion);
+ else
+ ret = sx9500_wait_for_sample(data);
+
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&data->mutex);
+
+ ret = sx9500_read_prox_data(data, chan, val);
+ if (ret < 0)
+ goto out;
+
+ ret = sx9500_dec_chan_users(data, chan->channel);
+ if (ret < 0)
+ goto out;
+
+ ret = sx9500_dec_data_rdy_users(data);
+ if (ret < 0)
+ goto out;
+
+ ret = IIO_VAL_INT;
+
+ goto out;
+
+out_dec_chan:
+ sx9500_dec_chan_users(data, chan->channel);
+out:
+ mutex_unlock(&data->mutex);
+ reinit_completion(&data->completion);
+
+ return ret;
+}
+
static int sx9500_read_samp_freq(struct sx9500_data *data,
int *val, int *val2)
{
int *val, int *val2, long mask)
{
struct sx9500_data *data = iio_priv(indio_dev);
- int ret;
switch (chan->type) {
case IIO_PROXIMITY:
case IIO_CHAN_INFO_RAW:
if (iio_buffer_enabled(indio_dev))
return -EBUSY;
- mutex_lock(&data->mutex);
- ret = sx9500_read_proximity(data, chan, val);
- mutex_unlock(&data->mutex);
- return ret;
+ return sx9500_read_proximity(data, chan, val);
case IIO_CHAN_INFO_SAMP_FREQ:
return sx9500_read_samp_freq(data, val, val2);
default:
return IRQ_WAKE_THREAD;
}
-static irqreturn_t sx9500_irq_thread_handler(int irq, void *private)
+static void sx9500_push_events(struct iio_dev *indio_dev)
{
- struct iio_dev *indio_dev = private;
- struct sx9500_data *data = iio_priv(indio_dev);
int ret;
unsigned int val, chan;
-
- mutex_lock(&data->mutex);
-
- ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val);
- if (ret < 0) {
- dev_err(&data->client->dev, "i2c transfer error in irq\n");
- goto out;
- }
-
- if (!(val & (SX9500_CLOSE_IRQ | SX9500_FAR_IRQ)))
- goto out;
+ struct sx9500_data *data = iio_priv(indio_dev);
ret = regmap_read(data->regmap, SX9500_REG_STAT, &val);
if (ret < 0) {
dev_err(&data->client->dev, "i2c transfer error in irq\n");
- goto out;
+ return;
}
val >>= SX9500_PROXSTAT_SHIFT;
/* No change on this channel. */
continue;
- dir = new_prox ? IIO_EV_DIR_FALLING :
- IIO_EV_DIR_RISING;
- ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY,
- chan,
- IIO_EV_TYPE_THRESH,
- dir);
+ dir = new_prox ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING;
+ ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, chan,
+ IIO_EV_TYPE_THRESH, dir);
iio_push_event(indio_dev, ev, iio_get_time_ns());
data->prox_stat[chan] = new_prox;
}
+}
+
+static irqreturn_t sx9500_irq_thread_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct sx9500_data *data = iio_priv(indio_dev);
+ int ret;
+ unsigned int val;
+
+ mutex_lock(&data->mutex);
+
+ ret = regmap_read(data->regmap, SX9500_REG_IRQ_SRC, &val);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "i2c transfer error in irq\n");
+ goto out;
+ }
+
+ if (val & (SX9500_CLOSE_IRQ | SX9500_FAR_IRQ))
+ sx9500_push_events(indio_dev);
+
+ if (val & SX9500_CONVDONE_IRQ)
+ complete_all(&data->completion);
out:
mutex_unlock(&data->mutex);
int state)
{
struct sx9500_data *data = iio_priv(indio_dev);
- int ret, i;
- bool any_active = false;
- unsigned int irqmask;
+ int ret;
if (chan->type != IIO_PROXIMITY || type != IIO_EV_TYPE_THRESH ||
dir != IIO_EV_DIR_EITHER)
mutex_lock(&data->mutex);
- data->event_enabled[chan->channel] = state;
+ if (state == 1) {
+ ret = sx9500_inc_chan_users(data, chan->channel);
+ if (ret < 0)
+ goto out_unlock;
+ ret = sx9500_inc_close_far_users(data);
+ if (ret < 0)
+ goto out_undo_chan;
+ } else {
+ ret = sx9500_dec_chan_users(data, chan->channel);
+ if (ret < 0)
+ goto out_unlock;
+ ret = sx9500_dec_close_far_users(data);
+ if (ret < 0)
+ goto out_undo_chan;
+ }
- for (i = 0; i < SX9500_NUM_CHANNELS; i++)
- if (data->event_enabled[i]) {
- any_active = true;
- break;
- }
+ data->event_enabled[chan->channel] = state;
+ goto out_unlock;
- irqmask = SX9500_CLOSE_IRQ | SX9500_FAR_IRQ;
- if (any_active)
- ret = regmap_update_bits(data->regmap, SX9500_REG_IRQ_MSK,
- irqmask, irqmask);
+out_undo_chan:
+ if (state == 1)
+ sx9500_dec_chan_users(data, chan->channel);
else
- ret = regmap_update_bits(data->regmap, SX9500_REG_IRQ_MSK,
- irqmask, 0);
-
+ sx9500_inc_chan_users(data, chan->channel);
+out_unlock:
mutex_unlock(&data->mutex);
-
return ret;
}
mutex_lock(&data->mutex);
- ret = regmap_update_bits(data->regmap, SX9500_REG_IRQ_MSK,
- SX9500_CONVDONE_IRQ,
- state ? SX9500_CONVDONE_IRQ : 0);
- if (ret == 0)
- data->trigger_enabled = state;
+ if (state)
+ ret = sx9500_inc_data_rdy_users(data);
+ else
+ ret = sx9500_dec_data_rdy_users(data);
+ if (ret < 0)
+ goto out;
+
+ data->trigger_enabled = state;
+out:
mutex_unlock(&data->mutex);
return ret;
for_each_set_bit(bit, indio_dev->active_scan_mask,
indio_dev->masklength) {
- ret = sx9500_read_proximity(data, &indio_dev->channels[bit],
+ ret = sx9500_read_prox_data(data, &indio_dev->channels[bit],
&val);
if (ret < 0)
goto out;
return IRQ_HANDLED;
}
+static int sx9500_buffer_preenable(struct iio_dev *indio_dev)
+{
+ struct sx9500_data *data = iio_priv(indio_dev);
+ int ret, i;
+
+ mutex_lock(&data->mutex);
+
+ for (i = 0; i < SX9500_NUM_CHANNELS; i++)
+ if (test_bit(i, indio_dev->active_scan_mask)) {
+ ret = sx9500_inc_chan_users(data, i);
+ if (ret)
+ break;
+ }
+
+ if (ret)
+ for (i = i - 1; i >= 0; i--)
+ if (test_bit(i, indio_dev->active_scan_mask))
+ sx9500_dec_chan_users(data, i);
+
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static int sx9500_buffer_predisable(struct iio_dev *indio_dev)
+{
+ struct sx9500_data *data = iio_priv(indio_dev);
+ int ret, i;
+
+ iio_triggered_buffer_predisable(indio_dev);
+
+ mutex_lock(&data->mutex);
+
+ for (i = 0; i < SX9500_NUM_CHANNELS; i++)
+ if (test_bit(i, indio_dev->active_scan_mask)) {
+ ret = sx9500_dec_chan_users(data, i);
+ if (ret)
+ break;
+ }
+
+ if (ret)
+ for (i = i - 1; i >= 0; i--)
+ if (test_bit(i, indio_dev->active_scan_mask))
+ sx9500_inc_chan_users(data, i);
+
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+
+static const struct iio_buffer_setup_ops sx9500_buffer_setup_ops = {
+ .preenable = sx9500_buffer_preenable,
+ .postenable = iio_triggered_buffer_postenable,
+ .predisable = sx9500_buffer_predisable,
+};
+
struct sx9500_reg_default {
u8 reg;
u8 def;
},
{
.reg = SX9500_REG_PROX_CTRL0,
- /* Scan period: 30ms, all sensors enabled. */
- .def = 0x0f,
+ /* Scan period: 30ms, all sensors disabled. */
+ .def = 0x00,
},
};
+/* Activate all channels and perform an initial compensation. */
+static int sx9500_init_compensation(struct iio_dev *indio_dev)
+{
+ struct sx9500_data *data = iio_priv(indio_dev);
+ int i, ret;
+ unsigned int val;
+
+ ret = regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0,
+ GENMASK(SX9500_NUM_CHANNELS, 0),
+ GENMASK(SX9500_NUM_CHANNELS, 0));
+ if (ret < 0)
+ return ret;
+
+ for (i = 10; i >= 0; i--) {
+ usleep_range(10000, 20000);
+ ret = regmap_read(data->regmap, SX9500_REG_STAT, &val);
+ if (ret < 0)
+ goto out;
+ if (!(val & SX9500_COMPSTAT_MASK))
+ break;
+ }
+
+ if (i < 0) {
+ dev_err(&data->client->dev, "initial compensation timed out");
+ ret = -ETIMEDOUT;
+ }
+
+out:
+ regmap_update_bits(data->regmap, SX9500_REG_PROX_CTRL0,
+ GENMASK(SX9500_NUM_CHANNELS, 0), 0);
+ return ret;
+}
+
static int sx9500_init_device(struct iio_dev *indio_dev)
{
struct sx9500_data *data = iio_priv(indio_dev);
int ret, i;
unsigned int val;
+ if (data->gpiod_rst) {
+ gpiod_set_value_cansleep(data->gpiod_rst, 0);
+ usleep_range(1000, 2000);
+ gpiod_set_value_cansleep(data->gpiod_rst, 1);
+ usleep_range(1000, 2000);
+ }
+
ret = regmap_write(data->regmap, SX9500_REG_IRQ_MSK, 0);
if (ret < 0)
return ret;
return ret;
}
- return 0;
+ return sx9500_init_compensation(indio_dev);
}
-static int sx9500_gpio_probe(struct i2c_client *client,
- struct sx9500_data *data)
+static void sx9500_gpio_probe(struct i2c_client *client,
+ struct sx9500_data *data)
{
struct device *dev;
struct gpio_desc *gpio;
- int ret;
if (!client)
- return -EINVAL;
+ return;
dev = &client->dev;
- /* data ready gpio interrupt pin */
- gpio = devm_gpiod_get_index(dev, SX9500_GPIO_NAME, 0, GPIOD_IN);
- if (IS_ERR(gpio)) {
- dev_err(dev, "acpi gpio get index failed\n");
- return PTR_ERR(gpio);
+ if (client->irq <= 0) {
+ gpio = devm_gpiod_get_index(dev, SX9500_GPIO_INT, 0, GPIOD_IN);
+ if (IS_ERR(gpio))
+ dev_err(dev, "gpio get irq failed\n");
+ else
+ client->irq = gpiod_to_irq(gpio);
}
- ret = gpiod_to_irq(gpio);
-
- dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
-
- return ret;
+ data->gpiod_rst = devm_gpiod_get_index(dev, SX9500_GPIO_RESET,
+ 0, GPIOD_OUT_HIGH);
+ if (IS_ERR(data->gpiod_rst)) {
+ dev_warn(dev, "gpio get reset pin failed\n");
+ data->gpiod_rst = NULL;
+ }
}
static int sx9500_probe(struct i2c_client *client,
data = iio_priv(indio_dev);
data->client = client;
mutex_init(&data->mutex);
+ init_completion(&data->completion);
data->trigger_enabled = false;
data->regmap = devm_regmap_init_i2c(client, &sx9500_regmap_config);
if (IS_ERR(data->regmap))
return PTR_ERR(data->regmap);
- sx9500_init_device(indio_dev);
-
indio_dev->dev.parent = &client->dev;
indio_dev->name = SX9500_DRIVER_NAME;
indio_dev->channels = sx9500_channels;
indio_dev->modes = INDIO_DIRECT_MODE;
i2c_set_clientdata(client, indio_dev);
- if (client->irq <= 0)
- client->irq = sx9500_gpio_probe(client, data);
+ sx9500_gpio_probe(client, data);
- if (client->irq > 0) {
+ ret = sx9500_init_device(indio_dev);
+ if (ret < 0)
+ return ret;
+
+ if (client->irq <= 0)
+ dev_warn(&client->dev, "no valid irq found\n");
+ else {
ret = devm_request_threaded_irq(&client->dev, client->irq,
sx9500_irq_handler, sx9500_irq_thread_handler,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
}
ret = iio_triggered_buffer_setup(indio_dev, NULL,
- sx9500_trigger_handler, NULL);
+ sx9500_trigger_handler,
+ &sx9500_buffer_setup_ops);
if (ret < 0)
goto out_trigger_unregister;
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int sx9500_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct sx9500_data *data = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&data->mutex);
+ ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0,
+ &data->suspend_ctrl0);
+ if (ret < 0)
+ goto out;
+
+ /*
+ * Scan period doesn't matter because when all the sensors are
+ * deactivated the device is in sleep mode.
+ */
+ ret = regmap_write(data->regmap, SX9500_REG_PROX_CTRL0, 0);
+
+out:
+ mutex_unlock(&data->mutex);
+ return ret;
+}
+
+static int sx9500_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct sx9500_data *data = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&data->mutex);
+ ret = regmap_write(data->regmap, SX9500_REG_PROX_CTRL0,
+ data->suspend_ctrl0);
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops sx9500_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(sx9500_suspend, sx9500_resume)
+};
+
static const struct acpi_device_id sx9500_acpi_match[] = {
{"SSX9500", 0},
{ },
static const struct i2c_device_id sx9500_id[] = {
{"sx9500", 0},
- {}
+ { },
};
MODULE_DEVICE_TABLE(i2c, sx9500_id);
.driver = {
.name = SX9500_DRIVER_NAME,
.acpi_match_table = ACPI_PTR(sx9500_acpi_match),
+ .pm = &sx9500_pm_ops,
},
.probe = sx9500_probe,
.remove = sx9500_remove,
projects / linux-drm-fsl-dcu.git / blobdiff