Merge branch 'rotary-encoder' into next
Bring in updates to roraty encoder driver switching it away from legacy platform data and over to generic device properties and adding support for encoders using more than 2 GPIOs.
这个提交包含在：
Dmitry Torokhov
@@ -97,8 +97,7 @@ static void arizona_haptics_work(struct work_struct *work)
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ret = regmap_update_bits(arizona->regmap,
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ARIZONA_HAPTICS_CONTROL_1,
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ARIZONA_HAP_CTRL_MASK,
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1 << ARIZONA_HAP_CTRL_SHIFT);
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ARIZONA_HAP_CTRL_MASK, 0);
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if (ret != 0) {
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dev_err(arizona->dev, "Failed to stop haptics: %d\n",
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ret);
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@@ -20,70 +20,78 @@
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#include <linux/input.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/rotary_encoder.h>
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#include <linux/gpio/consumer.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/of_gpio.h>
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#include <linux/pm.h>
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#include <linux/property.h>
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#define DRV_NAME "rotary-encoder"
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struct rotary_encoder {
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struct input_dev *input;
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const struct rotary_encoder_platform_data *pdata;
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unsigned int axis;
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struct mutex access_mutex;
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u32 steps;
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u32 axis;
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bool relative_axis;
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bool rollover;
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unsigned int pos;
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unsigned int irq_a;
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unsigned int irq_b;
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struct gpio_descs *gpios;
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unsigned int *irq;
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bool armed;
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unsigned char dir; /* 0 - clockwise, 1 - CCW */
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signed char dir; /* 1 - clockwise, -1 - CCW */
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char last_stable;
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unsigned last_stable;
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};
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static int rotary_encoder_get_state(const struct rotary_encoder_platform_data *pdata)
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static unsigned rotary_encoder_get_state(struct rotary_encoder *encoder)
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{
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int a = !!gpio_get_value(pdata->gpio_a);
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int b = !!gpio_get_value(pdata->gpio_b);
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int i;
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unsigned ret = 0;
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a ^= pdata->inverted_a;
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b ^= pdata->inverted_b;
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for (i = 0; i < encoder->gpios->ndescs; ++i) {
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int val = gpiod_get_value_cansleep(encoder->gpios->desc[i]);
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/* convert from gray encoding to normal */
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if (ret & 1)
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val = !val;
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return ((a << 1) | b);
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ret = ret << 1 | val;
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}
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return ret & 3;
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}
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static void rotary_encoder_report_event(struct rotary_encoder *encoder)
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{
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const struct rotary_encoder_platform_data *pdata = encoder->pdata;
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if (pdata->relative_axis) {
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if (encoder->relative_axis) {
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input_report_rel(encoder->input,
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pdata->axis, encoder->dir ? -1 : 1);
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encoder->axis, encoder->dir);
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} else {
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unsigned int pos = encoder->pos;
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if (encoder->dir) {
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if (encoder->dir < 0) {
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/* turning counter-clockwise */
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if (pdata->rollover)
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pos += pdata->steps;
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if (encoder->rollover)
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pos += encoder->steps;
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if (pos)
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pos--;
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} else {
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/* turning clockwise */
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if (pdata->rollover || pos < pdata->steps)
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if (encoder->rollover || pos < encoder->steps)
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pos++;
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}
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if (pdata->rollover)
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pos %= pdata->steps;
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if (encoder->rollover)
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pos %= encoder->steps;
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encoder->pos = pos;
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input_report_abs(encoder->input, pdata->axis, encoder->pos);
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input_report_abs(encoder->input, encoder->axis, encoder->pos);
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}
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input_sync(encoder->input);
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@@ -92,9 +100,11 @@ static void rotary_encoder_report_event(struct rotary_encoder *encoder)
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static irqreturn_t rotary_encoder_irq(int irq, void *dev_id)
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{
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struct rotary_encoder *encoder = dev_id;
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int state;
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unsigned state;
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state = rotary_encoder_get_state(encoder->pdata);
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mutex_lock(&encoder->access_mutex);
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state = rotary_encoder_get_state(encoder);
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switch (state) {
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case 0x0:
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@@ -105,334 +115,227 @@ static irqreturn_t rotary_encoder_irq(int irq, void *dev_id)
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break;
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case 0x1:
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case 0x2:
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case 0x3:
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if (encoder->armed)
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encoder->dir = state - 1;
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encoder->dir = 2 - state;
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break;
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case 0x3:
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case 0x2:
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encoder->armed = true;
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break;
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}
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mutex_unlock(&encoder->access_mutex);
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return IRQ_HANDLED;
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}
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static irqreturn_t rotary_encoder_half_period_irq(int irq, void *dev_id)
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{
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struct rotary_encoder *encoder = dev_id;
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int state;
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unsigned int state;
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state = rotary_encoder_get_state(encoder->pdata);
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mutex_lock(&encoder->access_mutex);
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switch (state) {
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case 0x00:
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case 0x03:
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state = rotary_encoder_get_state(encoder);
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if (state & 1) {
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encoder->dir = ((encoder->last_stable - state + 1) % 4) - 1;
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} else {
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if (state != encoder->last_stable) {
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rotary_encoder_report_event(encoder);
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encoder->last_stable = state;
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}
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break;
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case 0x01:
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case 0x02:
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encoder->dir = (encoder->last_stable + state) & 0x01;
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break;
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}
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mutex_unlock(&encoder->access_mutex);
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return IRQ_HANDLED;
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}
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static irqreturn_t rotary_encoder_quarter_period_irq(int irq, void *dev_id)
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{
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struct rotary_encoder *encoder = dev_id;
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unsigned char sum;
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int state;
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unsigned int state;
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state = rotary_encoder_get_state(encoder->pdata);
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mutex_lock(&encoder->access_mutex);
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/*
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* We encode the previous and the current state using a byte.
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* The previous state in the MSB nibble, the current state in the LSB
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* nibble. Then use a table to decide the direction of the turn.
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*/
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sum = (encoder->last_stable << 4) + state;
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switch (sum) {
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case 0x31:
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case 0x10:
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case 0x02:
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case 0x23:
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encoder->dir = 0; /* clockwise */
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break;
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state = rotary_encoder_get_state(encoder);
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case 0x13:
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case 0x01:
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case 0x20:
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case 0x32:
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encoder->dir = 1; /* counter-clockwise */
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break;
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default:
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/*
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* Ignore all other values. This covers the case when the
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* state didn't change (a spurious interrupt) and the
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* cases where the state changed by two steps, making it
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* impossible to tell the direction.
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*
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* In either case, don't report any event and save the
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* state for later.
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*/
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if ((encoder->last_stable + 1) % 4 == state)
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encoder->dir = 1;
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else if (encoder->last_stable == (state + 1) % 4)
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encoder->dir = -1;
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else
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goto out;
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}
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rotary_encoder_report_event(encoder);
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out:
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encoder->last_stable = state;
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mutex_unlock(&encoder->access_mutex);
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return IRQ_HANDLED;
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}
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static int rotary_encoder_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct rotary_encoder *encoder;
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struct input_dev *input;
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irq_handler_t handler;
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u32 steps_per_period;
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unsigned int i;
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int err;
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encoder = devm_kzalloc(dev, sizeof(struct rotary_encoder), GFP_KERNEL);
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if (!encoder)
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return -ENOMEM;
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mutex_init(&encoder->access_mutex);
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device_property_read_u32(dev, "rotary-encoder,steps", &encoder->steps);
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err = device_property_read_u32(dev, "rotary-encoder,steps-per-period",
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&steps_per_period);
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if (err) {
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/*
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* The 'half-period' property has been deprecated, you must
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* use 'steps-per-period' and set an appropriate value, but
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* we still need to parse it to maintain compatibility. If
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* neither property is present we fall back to the one step
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* per period behavior.
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*/
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steps_per_period = device_property_read_bool(dev,
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"rotary-encoder,half-period") ? 2 : 1;
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}
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encoder->rollover =
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device_property_read_bool(dev, "rotary-encoder,rollover");
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device_property_read_u32(dev, "linux,axis", &encoder->axis);
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encoder->relative_axis =
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device_property_read_bool(dev, "rotary-encoder,relative-axis");
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encoder->gpios = devm_gpiod_get_array(dev, NULL, GPIOD_IN);
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if (IS_ERR(encoder->gpios)) {
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dev_err(dev, "unable to get gpios\n");
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return PTR_ERR(encoder->gpios);
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}
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if (encoder->gpios->ndescs < 2) {
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dev_err(dev, "not enough gpios found\n");
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return -EINVAL;
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}
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input = devm_input_allocate_device(dev);
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if (!input)
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return -ENOMEM;
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encoder->input = input;
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input->name = pdev->name;
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input->id.bustype = BUS_HOST;
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input->dev.parent = dev;
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if (encoder->relative_axis)
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input_set_capability(input, EV_REL, encoder->axis);
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else
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input_set_abs_params(input,
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encoder->axis, 0, encoder->steps, 0, 1);
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switch (steps_per_period >> (encoder->gpios->ndescs - 2)) {
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case 4:
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handler = &rotary_encoder_quarter_period_irq;
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encoder->last_stable = rotary_encoder_get_state(encoder);
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break;
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case 2:
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handler = &rotary_encoder_half_period_irq;
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encoder->last_stable = rotary_encoder_get_state(encoder);
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break;
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case 1:
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handler = &rotary_encoder_irq;
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break;
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default:
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dev_err(dev, "'%d' is not a valid steps-per-period value\n",
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steps_per_period);
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return -EINVAL;
|
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}
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encoder->irq =
|
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devm_kzalloc(dev,
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sizeof(*encoder->irq) * encoder->gpios->ndescs,
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GFP_KERNEL);
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if (!encoder->irq)
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return -ENOMEM;
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for (i = 0; i < encoder->gpios->ndescs; ++i) {
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encoder->irq[i] = gpiod_to_irq(encoder->gpios->desc[i]);
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err = devm_request_threaded_irq(dev, encoder->irq[i],
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NULL, handler,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
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IRQF_ONESHOT,
|
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DRV_NAME, encoder);
|
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if (err) {
|
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dev_err(dev, "unable to request IRQ %d (gpio#%d)\n",
|
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encoder->irq[i], i);
|
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return err;
|
||||
}
|
||||
}
|
||||
|
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err = input_register_device(input);
|
||||
if (err) {
|
||||
dev_err(dev, "failed to register input device\n");
|
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return err;
|
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}
|
||||
|
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device_init_wakeup(dev,
|
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device_property_read_bool(dev, "wakeup-source"));
|
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|
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platform_set_drvdata(pdev, encoder);
|
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|
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return 0;
|
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}
|
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|
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static int __maybe_unused rotary_encoder_suspend(struct device *dev)
|
||||
{
|
||||
struct rotary_encoder *encoder = dev_get_drvdata(dev);
|
||||
unsigned int i;
|
||||
|
||||
if (device_may_wakeup(dev)) {
|
||||
for (i = 0; i < encoder->gpios->ndescs; ++i)
|
||||
enable_irq_wake(encoder->irq[i]);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __maybe_unused rotary_encoder_resume(struct device *dev)
|
||||
{
|
||||
struct rotary_encoder *encoder = dev_get_drvdata(dev);
|
||||
unsigned int i;
|
||||
|
||||
if (device_may_wakeup(dev)) {
|
||||
for (i = 0; i < encoder->gpios->ndescs; ++i)
|
||||
disable_irq_wake(encoder->irq[i]);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static SIMPLE_DEV_PM_OPS(rotary_encoder_pm_ops,
|
||||
rotary_encoder_suspend, rotary_encoder_resume);
|
||||
|
||||
#ifdef CONFIG_OF
|
||||
static const struct of_device_id rotary_encoder_of_match[] = {
|
||||
{ .compatible = "rotary-encoder", },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, rotary_encoder_of_match);
|
||||
|
||||
static struct rotary_encoder_platform_data *rotary_encoder_parse_dt(struct device *dev)
|
||||
{
|
||||
const struct of_device_id *of_id =
|
||||
of_match_device(rotary_encoder_of_match, dev);
|
||||
struct device_node *np = dev->of_node;
|
||||
struct rotary_encoder_platform_data *pdata;
|
||||
enum of_gpio_flags flags;
|
||||
int error;
|
||||
|
||||
if (!of_id || !np)
|
||||
return NULL;
|
||||
|
||||
pdata = kzalloc(sizeof(struct rotary_encoder_platform_data),
|
||||
GFP_KERNEL);
|
||||
if (!pdata)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
of_property_read_u32(np, "rotary-encoder,steps", &pdata->steps);
|
||||
of_property_read_u32(np, "linux,axis", &pdata->axis);
|
||||
|
||||
pdata->gpio_a = of_get_gpio_flags(np, 0, &flags);
|
||||
pdata->inverted_a = flags & OF_GPIO_ACTIVE_LOW;
|
||||
|
||||
pdata->gpio_b = of_get_gpio_flags(np, 1, &flags);
|
||||
pdata->inverted_b = flags & OF_GPIO_ACTIVE_LOW;
|
||||
|
||||
pdata->relative_axis =
|
||||
of_property_read_bool(np, "rotary-encoder,relative-axis");
|
||||
pdata->rollover = of_property_read_bool(np, "rotary-encoder,rollover");
|
||||
|
||||
error = of_property_read_u32(np, "rotary-encoder,steps-per-period",
|
||||
&pdata->steps_per_period);
|
||||
if (error) {
|
||||
/*
|
||||
* The 'half-period' property has been deprecated, you must use
|
||||
* 'steps-per-period' and set an appropriate value, but we still
|
||||
* need to parse it to maintain compatibility.
|
||||
*/
|
||||
if (of_property_read_bool(np, "rotary-encoder,half-period")) {
|
||||
pdata->steps_per_period = 2;
|
||||
} else {
|
||||
/* Fallback to one step per period behavior */
|
||||
pdata->steps_per_period = 1;
|
||||
}
|
||||
}
|
||||
|
||||
pdata->wakeup_source = of_property_read_bool(np, "wakeup-source");
|
||||
|
||||
return pdata;
|
||||
}
|
||||
#else
|
||||
static inline struct rotary_encoder_platform_data *
|
||||
rotary_encoder_parse_dt(struct device *dev)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
#endif
|
||||
|
||||
static int rotary_encoder_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct device *dev = &pdev->dev;
|
||||
const struct rotary_encoder_platform_data *pdata = dev_get_platdata(dev);
|
||||
struct rotary_encoder *encoder;
|
||||
struct input_dev *input;
|
||||
irq_handler_t handler;
|
||||
int err;
|
||||
|
||||
if (!pdata) {
|
||||
pdata = rotary_encoder_parse_dt(dev);
|
||||
if (IS_ERR(pdata))
|
||||
return PTR_ERR(pdata);
|
||||
|
||||
if (!pdata) {
|
||||
dev_err(dev, "missing platform data\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
encoder = kzalloc(sizeof(struct rotary_encoder), GFP_KERNEL);
|
||||
input = input_allocate_device();
|
||||
if (!encoder || !input) {
|
||||
err = -ENOMEM;
|
||||
goto exit_free_mem;
|
||||
}
|
||||
|
||||
encoder->input = input;
|
||||
encoder->pdata = pdata;
|
||||
|
||||
input->name = pdev->name;
|
||||
input->id.bustype = BUS_HOST;
|
||||
input->dev.parent = dev;
|
||||
|
||||
if (pdata->relative_axis) {
|
||||
input->evbit[0] = BIT_MASK(EV_REL);
|
||||
input->relbit[0] = BIT_MASK(pdata->axis);
|
||||
} else {
|
||||
input->evbit[0] = BIT_MASK(EV_ABS);
|
||||
input_set_abs_params(encoder->input,
|
||||
pdata->axis, 0, pdata->steps, 0, 1);
|
||||
}
|
||||
|
||||
/* request the GPIOs */
|
||||
err = gpio_request_one(pdata->gpio_a, GPIOF_IN, dev_name(dev));
|
||||
if (err) {
|
||||
dev_err(dev, "unable to request GPIO %d\n", pdata->gpio_a);
|
||||
goto exit_free_mem;
|
||||
}
|
||||
|
||||
err = gpio_request_one(pdata->gpio_b, GPIOF_IN, dev_name(dev));
|
||||
if (err) {
|
||||
dev_err(dev, "unable to request GPIO %d\n", pdata->gpio_b);
|
||||
goto exit_free_gpio_a;
|
||||
}
|
||||
|
||||
encoder->irq_a = gpio_to_irq(pdata->gpio_a);
|
||||
encoder->irq_b = gpio_to_irq(pdata->gpio_b);
|
||||
|
||||
switch (pdata->steps_per_period) {
|
||||
case 4:
|
||||
handler = &rotary_encoder_quarter_period_irq;
|
||||
encoder->last_stable = rotary_encoder_get_state(pdata);
|
||||
break;
|
||||
case 2:
|
||||
handler = &rotary_encoder_half_period_irq;
|
||||
encoder->last_stable = rotary_encoder_get_state(pdata);
|
||||
break;
|
||||
case 1:
|
||||
handler = &rotary_encoder_irq;
|
||||
break;
|
||||
default:
|
||||
dev_err(dev, "'%d' is not a valid steps-per-period value\n",
|
||||
pdata->steps_per_period);
|
||||
err = -EINVAL;
|
||||
goto exit_free_gpio_b;
|
||||
}
|
||||
|
||||
err = request_irq(encoder->irq_a, handler,
|
||||
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
|
||||
DRV_NAME, encoder);
|
||||
if (err) {
|
||||
dev_err(dev, "unable to request IRQ %d\n", encoder->irq_a);
|
||||
goto exit_free_gpio_b;
|
||||
}
|
||||
|
||||
err = request_irq(encoder->irq_b, handler,
|
||||
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
|
||||
DRV_NAME, encoder);
|
||||
if (err) {
|
||||
dev_err(dev, "unable to request IRQ %d\n", encoder->irq_b);
|
||||
goto exit_free_irq_a;
|
||||
}
|
||||
|
||||
err = input_register_device(input);
|
||||
if (err) {
|
||||
dev_err(dev, "failed to register input device\n");
|
||||
goto exit_free_irq_b;
|
||||
}
|
||||
|
||||
device_init_wakeup(&pdev->dev, pdata->wakeup_source);
|
||||
|
||||
platform_set_drvdata(pdev, encoder);
|
||||
|
||||
return 0;
|
||||
|
||||
exit_free_irq_b:
|
||||
free_irq(encoder->irq_b, encoder);
|
||||
exit_free_irq_a:
|
||||
free_irq(encoder->irq_a, encoder);
|
||||
exit_free_gpio_b:
|
||||
gpio_free(pdata->gpio_b);
|
||||
exit_free_gpio_a:
|
||||
gpio_free(pdata->gpio_a);
|
||||
exit_free_mem:
|
||||
input_free_device(input);
|
||||
kfree(encoder);
|
||||
if (!dev_get_platdata(&pdev->dev))
|
||||
kfree(pdata);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int rotary_encoder_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct rotary_encoder *encoder = platform_get_drvdata(pdev);
|
||||
const struct rotary_encoder_platform_data *pdata = encoder->pdata;
|
||||
|
||||
device_init_wakeup(&pdev->dev, false);
|
||||
|
||||
free_irq(encoder->irq_a, encoder);
|
||||
free_irq(encoder->irq_b, encoder);
|
||||
gpio_free(pdata->gpio_a);
|
||||
gpio_free(pdata->gpio_b);
|
||||
|
||||
input_unregister_device(encoder->input);
|
||||
kfree(encoder);
|
||||
|
||||
if (!dev_get_platdata(&pdev->dev))
|
||||
kfree(pdata);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
static int rotary_encoder_suspend(struct device *dev)
|
||||
{
|
||||
struct rotary_encoder *encoder = dev_get_drvdata(dev);
|
||||
|
||||
if (device_may_wakeup(dev)) {
|
||||
enable_irq_wake(encoder->irq_a);
|
||||
enable_irq_wake(encoder->irq_b);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int rotary_encoder_resume(struct device *dev)
|
||||
{
|
||||
struct rotary_encoder *encoder = dev_get_drvdata(dev);
|
||||
|
||||
if (device_may_wakeup(dev)) {
|
||||
disable_irq_wake(encoder->irq_a);
|
||||
disable_irq_wake(encoder->irq_b);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
static SIMPLE_DEV_PM_OPS(rotary_encoder_pm_ops,
|
||||
rotary_encoder_suspend, rotary_encoder_resume);
|
||||
|
||||
static struct platform_driver rotary_encoder_driver = {
|
||||
.probe = rotary_encoder_probe,
|
||||
.remove = rotary_encoder_remove,
|
||||
.driver = {
|
||||
.name = DRV_NAME,
|
||||
.pm = &rotary_encoder_pm_ops,
|
||||
|
||||
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