Input: adp5588-keys - export unused GPIO pins
This patch allows exporting GPIO pins not used by the keypad itself
to be accessible from elsewhere.
Signed-off-by: Xiaolong Chen <xiao-long.chen@motorola.com>
Signed-off-by: Yuanbo Ye <yuan-bo.ye@motorola.com>
Signed-off-by: Tao Hu <taohu@motorola.com>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/keyboard/adp5588-keys.c b/drivers/input/keyboard/adp5588-keys.c
index 9096db7..c39ec93 100644
--- a/drivers/input/keyboard/adp5588-keys.c
+++ b/drivers/input/keyboard/adp5588-keys.c
@@ -19,6 +19,7 @@
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/i2c.h>
+#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/i2c/adp5588.h>
@@ -54,6 +55,10 @@
#define KEYP_MAX_EVENT 10
+#define MAXGPIO 18
+#define ADP_BANK(offs) ((offs) >> 3)
+#define ADP_BIT(offs) (1u << ((offs) & 0x7))
+
/*
* Early pre 4.0 Silicon required to delay readout by at least 25ms,
* since the Event Counter Register updated 25ms after the interrupt
@@ -69,6 +74,14 @@
unsigned short keycode[ADP5588_KEYMAPSIZE];
const struct adp5588_gpi_map *gpimap;
unsigned short gpimapsize;
+#ifdef CONFIG_GPIOLIB
+ unsigned char gpiomap[MAXGPIO];
+ bool export_gpio;
+ struct gpio_chip gc;
+ struct mutex gpio_lock; /* Protect cached dir, dat_out */
+ u8 dat_out[3];
+ u8 dir[3];
+#endif
};
static int adp5588_read(struct i2c_client *client, u8 reg)
@@ -86,6 +99,183 @@
return i2c_smbus_write_byte_data(client, reg, val);
}
+#ifdef CONFIG_GPIOLIB
+static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
+{
+ struct adp5588_kpad *kpad = container_of(chip, struct adp5588_kpad, gc);
+ unsigned int bank = ADP_BANK(kpad->gpiomap[off]);
+ unsigned int bit = ADP_BIT(kpad->gpiomap[off]);
+
+ return !!(adp5588_read(kpad->client, GPIO_DAT_STAT1 + bank) & bit);
+}
+
+static void adp5588_gpio_set_value(struct gpio_chip *chip,
+ unsigned off, int val)
+{
+ struct adp5588_kpad *kpad = container_of(chip, struct adp5588_kpad, gc);
+ unsigned int bank = ADP_BANK(kpad->gpiomap[off]);
+ unsigned int bit = ADP_BIT(kpad->gpiomap[off]);
+
+ mutex_lock(&kpad->gpio_lock);
+
+ if (val)
+ kpad->dat_out[bank] |= bit;
+ else
+ kpad->dat_out[bank] &= ~bit;
+
+ adp5588_write(kpad->client, GPIO_DAT_OUT1 + bank,
+ kpad->dat_out[bank]);
+
+ mutex_unlock(&kpad->gpio_lock);
+}
+
+static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
+{
+ struct adp5588_kpad *kpad = container_of(chip, struct adp5588_kpad, gc);
+ unsigned int bank = ADP_BANK(kpad->gpiomap[off]);
+ unsigned int bit = ADP_BIT(kpad->gpiomap[off]);
+ int ret;
+
+ mutex_lock(&kpad->gpio_lock);
+
+ kpad->dir[bank] &= ~bit;
+ ret = adp5588_write(kpad->client, GPIO_DIR1 + bank, kpad->dir[bank]);
+
+ mutex_unlock(&kpad->gpio_lock);
+
+ return ret;
+}
+
+static int adp5588_gpio_direction_output(struct gpio_chip *chip,
+ unsigned off, int val)
+{
+ struct adp5588_kpad *kpad = container_of(chip, struct adp5588_kpad, gc);
+ unsigned int bank = ADP_BANK(kpad->gpiomap[off]);
+ unsigned int bit = ADP_BIT(kpad->gpiomap[off]);
+ int ret;
+
+ mutex_lock(&kpad->gpio_lock);
+
+ kpad->dir[bank] |= bit;
+
+ if (val)
+ kpad->dat_out[bank] |= bit;
+ else
+ kpad->dat_out[bank] &= ~bit;
+
+ ret = adp5588_write(kpad->client, GPIO_DAT_OUT1 + bank,
+ kpad->dat_out[bank]);
+ ret |= adp5588_write(kpad->client, GPIO_DIR1 + bank,
+ kpad->dir[bank]);
+
+ mutex_unlock(&kpad->gpio_lock);
+
+ return ret;
+}
+
+static int __devinit adp5588_gpio_add(struct device *dev)
+{
+ struct adp5588_kpad *kpad = dev_get_drvdata(dev);
+ const struct adp5588_kpad_platform_data *pdata = dev->platform_data;
+ const struct adp5588_gpio_platform_data *gpio_data = pdata->gpio_data;
+ int i, error;
+
+ if (gpio_data) {
+ int j = 0;
+ bool pin_used[MAXGPIO];
+
+ for (i = 0; i < pdata->rows; i++)
+ pin_used[i] = true;
+
+ for (i = 0; i < pdata->cols; i++)
+ pin_used[i + GPI_PIN_COL_BASE - GPI_PIN_BASE] = true;
+
+ for (i = 0; i < kpad->gpimapsize; i++)
+ pin_used[kpad->gpimap[i].pin - GPI_PIN_BASE] = true;
+
+ for (i = 0; i < MAXGPIO; i++) {
+ if (!pin_used[i])
+ kpad->gpiomap[j++] = i;
+ }
+ kpad->gc.ngpio = j;
+
+ if (kpad->gc.ngpio)
+ kpad->export_gpio = true;
+ }
+
+ if (!kpad->export_gpio) {
+ dev_info(dev, "No unused gpios left to export\n");
+ return 0;
+ }
+
+ kpad->gc.direction_input = adp5588_gpio_direction_input;
+ kpad->gc.direction_output = adp5588_gpio_direction_output;
+ kpad->gc.get = adp5588_gpio_get_value;
+ kpad->gc.set = adp5588_gpio_set_value;
+ kpad->gc.can_sleep = 1;
+
+ kpad->gc.base = gpio_data->gpio_start;
+ kpad->gc.label = kpad->client->name;
+ kpad->gc.owner = THIS_MODULE;
+
+ mutex_init(&kpad->gpio_lock);
+
+ error = gpiochip_add(&kpad->gc);
+ if (error) {
+ dev_err(dev, "gpiochip_add failed, err: %d\n", error);
+ return error;
+ }
+
+ for (i = 0; i <= ADP_BANK(MAXGPIO); i++) {
+ kpad->dat_out[i] = adp5588_read(kpad->client,
+ GPIO_DAT_OUT1 + i);
+ kpad->dir[i] = adp5588_read(kpad->client, GPIO_DIR1 + i);
+ }
+
+ if (gpio_data->setup) {
+ error = gpio_data->setup(kpad->client,
+ kpad->gc.base, kpad->gc.ngpio,
+ gpio_data->context);
+ if (error)
+ dev_warn(dev, "setup failed, %d\n", error);
+ }
+
+ return 0;
+}
+
+static void __devexit adp5588_gpio_remove(struct device *dev)
+{
+ struct adp5588_kpad *kpad = dev_get_drvdata(dev);
+ const struct adp5588_kpad_platform_data *pdata = dev->platform_data;
+ const struct adp5588_gpio_platform_data *gpio_data = pdata->gpio_data;
+ int error;
+
+ if (!kpad->export_gpio)
+ return;
+
+ if (gpio_data->teardown) {
+ error = gpio_data->teardown(kpad->client,
+ kpad->gc.base, kpad->gc.ngpio,
+ gpio_data->context);
+ if (error)
+ dev_warn(dev, "teardown failed %d\n", error);
+ }
+
+ error = gpiochip_remove(&kpad->gc);
+ if (error)
+ dev_warn(dev, "gpiochip_remove failed %d\n", error);
+}
+#else
+static inline int adp5588_gpio_add(struct device *dev)
+{
+ return 0;
+}
+
+static inline void adp5588_gpio_remove(struct device *dev)
+{
+}
+#endif
+
static void adp5588_report_events(struct adp5588_kpad *kpad, int ev_cnt)
{
int i, j;
@@ -150,7 +340,8 @@
static int __devinit adp5588_setup(struct i2c_client *client)
{
- struct adp5588_kpad_platform_data *pdata = client->dev.platform_data;
+ const struct adp5588_kpad_platform_data *pdata = client->dev.platform_data;
+ const struct adp5588_gpio_platform_data *gpio_data = pdata->gpio_data;
int i, ret;
unsigned char evt_mode1 = 0, evt_mode2 = 0, evt_mode3 = 0;
@@ -184,6 +375,15 @@
ret |= adp5588_write(client, GPI_EM3, evt_mode3);
}
+ if (gpio_data) {
+ for (i = 0; i <= ADP_BANK(MAXGPIO); i++) {
+ int pull_mask = gpio_data->pullup_dis_mask;
+
+ ret |= adp5588_write(client, GPIO_PULL1 + i,
+ (pull_mask >> (8 * i)) & 0xFF);
+ }
+ }
+
ret |= adp5588_write(client, INT_STAT, CMP2_INT | CMP1_INT |
OVR_FLOW_INT | K_LCK_INT |
GPI_INT | KE_INT); /* Status is W1C */
@@ -240,7 +440,7 @@
const struct i2c_device_id *id)
{
struct adp5588_kpad *kpad;
- struct adp5588_kpad_platform_data *pdata = client->dev.platform_data;
+ const struct adp5588_kpad_platform_data *pdata = client->dev.platform_data;
struct input_dev *input;
unsigned int revid;
int ret, i;
@@ -381,6 +581,10 @@
if (kpad->gpimapsize)
adp5588_report_switch_state(kpad);
+ error = adp5588_gpio_add(&client->dev);
+ if (error)
+ goto err_free_irq;
+
device_init_wakeup(&client->dev, 1);
i2c_set_clientdata(client, kpad);
@@ -407,6 +611,7 @@
free_irq(client->irq, kpad);
cancel_delayed_work_sync(&kpad->work);
input_unregister_device(kpad->input);
+ adp5588_gpio_remove(&client->dev);
kfree(kpad);
return 0;
diff --git a/include/linux/i2c/adp5588.h b/include/linux/i2c/adp5588.h
index b5f57c4..269181b 100644
--- a/include/linux/i2c/adp5588.h
+++ b/include/linux/i2c/adp5588.h
@@ -123,6 +123,7 @@
unsigned short unlock_key2; /* Unlock Key 2 */
const struct adp5588_gpi_map *gpimap;
unsigned short gpimapsize;
+ const struct adp5588_gpio_platform_data *gpio_data;
};
struct adp5588_gpio_platform_data {