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 (file)
--- 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 @@ struct adp5588_kpad {
        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 @@ static int adp5588_write(struct i2c_client *client, u8 reg, u8 val)
        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 irqreturn_t adp5588_irq(int irq, void *handle)
 
 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 @@ static int __devinit adp5588_setup(struct i2c_client *client)
                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 @@ static int __devinit adp5588_probe(struct i2c_client *client,
                                        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 @@ static int __devinit adp5588_probe(struct i2c_client *client,
        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 @@ static int __devexit adp5588_remove(struct i2c_client *client)
        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 (file)
--- a/include/linux/i2c/adp5588.h
+++ b/include/linux/i2c/adp5588.h
@@ -123,6 +123,7 @@ struct adp5588_kpad_platform_data {
        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 {