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>hifive-unleashed-5.1
Xiaolong Chen
Dmitry Torokhov
parent
f1cba532e8
commit
ba9f507a1b
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@ -19,6 +19,7 @@
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <linux/i2c/adp5588.h>
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@ -54,6 +55,10 @@
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#define KEYP_MAX_EVENT 10
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#define MAXGPIO 18
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#define ADP_BANK(offs) ((offs) >> 3)
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#define ADP_BIT(offs) (1u << ((offs) & 0x7))
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/*
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* Early pre 4.0 Silicon required to delay readout by at least 25ms,
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* since the Event Counter Register updated 25ms after the interrupt
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@ -69,6 +74,14 @@ struct adp5588_kpad {
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unsigned short keycode[ADP5588_KEYMAPSIZE];
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const struct adp5588_gpi_map *gpimap;
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unsigned short gpimapsize;
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#ifdef CONFIG_GPIOLIB
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unsigned char gpiomap[MAXGPIO];
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bool export_gpio;
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struct gpio_chip gc;
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struct mutex gpio_lock; /* Protect cached dir, dat_out */
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u8 dat_out[3];
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u8 dir[3];
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#endif
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};
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static int adp5588_read(struct i2c_client *client, u8 reg)
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@ -86,6 +99,183 @@ static int adp5588_write(struct i2c_client *client, u8 reg, u8 val)
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return i2c_smbus_write_byte_data(client, reg, val);
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}
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#ifdef CONFIG_GPIOLIB
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static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
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{
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struct adp5588_kpad *kpad = container_of(chip, struct adp5588_kpad, gc);
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unsigned int bank = ADP_BANK(kpad->gpiomap[off]);
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unsigned int bit = ADP_BIT(kpad->gpiomap[off]);
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return !!(adp5588_read(kpad->client, GPIO_DAT_STAT1 + bank) & bit);
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}
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static void adp5588_gpio_set_value(struct gpio_chip *chip,
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unsigned off, int val)
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{
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struct adp5588_kpad *kpad = container_of(chip, struct adp5588_kpad, gc);
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unsigned int bank = ADP_BANK(kpad->gpiomap[off]);
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unsigned int bit = ADP_BIT(kpad->gpiomap[off]);
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mutex_lock(&kpad->gpio_lock);
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if (val)
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kpad->dat_out[bank] |= bit;
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else
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kpad->dat_out[bank] &= ~bit;
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adp5588_write(kpad->client, GPIO_DAT_OUT1 + bank,
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kpad->dat_out[bank]);
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mutex_unlock(&kpad->gpio_lock);
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}
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static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
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{
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struct adp5588_kpad *kpad = container_of(chip, struct adp5588_kpad, gc);
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unsigned int bank = ADP_BANK(kpad->gpiomap[off]);
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unsigned int bit = ADP_BIT(kpad->gpiomap[off]);
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int ret;
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mutex_lock(&kpad->gpio_lock);
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kpad->dir[bank] &= ~bit;
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ret = adp5588_write(kpad->client, GPIO_DIR1 + bank, kpad->dir[bank]);
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mutex_unlock(&kpad->gpio_lock);
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return ret;
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}
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static int adp5588_gpio_direction_output(struct gpio_chip *chip,
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unsigned off, int val)
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{
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struct adp5588_kpad *kpad = container_of(chip, struct adp5588_kpad, gc);
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unsigned int bank = ADP_BANK(kpad->gpiomap[off]);
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unsigned int bit = ADP_BIT(kpad->gpiomap[off]);
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int ret;
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mutex_lock(&kpad->gpio_lock);
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kpad->dir[bank] |= bit;
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if (val)
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kpad->dat_out[bank] |= bit;
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else
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kpad->dat_out[bank] &= ~bit;
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ret = adp5588_write(kpad->client, GPIO_DAT_OUT1 + bank,
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kpad->dat_out[bank]);
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ret |= adp5588_write(kpad->client, GPIO_DIR1 + bank,
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kpad->dir[bank]);
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mutex_unlock(&kpad->gpio_lock);
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return ret;
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}
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static int __devinit adp5588_gpio_add(struct device *dev)
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{
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struct adp5588_kpad *kpad = dev_get_drvdata(dev);
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const struct adp5588_kpad_platform_data *pdata = dev->platform_data;
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const struct adp5588_gpio_platform_data *gpio_data = pdata->gpio_data;
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int i, error;
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if (gpio_data) {
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int j = 0;
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bool pin_used[MAXGPIO];
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for (i = 0; i < pdata->rows; i++)
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pin_used[i] = true;
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for (i = 0; i < pdata->cols; i++)
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pin_used[i + GPI_PIN_COL_BASE - GPI_PIN_BASE] = true;
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for (i = 0; i < kpad->gpimapsize; i++)
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pin_used[kpad->gpimap[i].pin - GPI_PIN_BASE] = true;
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for (i = 0; i < MAXGPIO; i++) {
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if (!pin_used[i])
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kpad->gpiomap[j++] = i;
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}
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kpad->gc.ngpio = j;
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if (kpad->gc.ngpio)
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kpad->export_gpio = true;
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}
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if (!kpad->export_gpio) {
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dev_info(dev, "No unused gpios left to export\n");
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return 0;
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}
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kpad->gc.direction_input = adp5588_gpio_direction_input;
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kpad->gc.direction_output = adp5588_gpio_direction_output;
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kpad->gc.get = adp5588_gpio_get_value;
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kpad->gc.set = adp5588_gpio_set_value;
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kpad->gc.can_sleep = 1;
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kpad->gc.base = gpio_data->gpio_start;
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kpad->gc.label = kpad->client->name;
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kpad->gc.owner = THIS_MODULE;
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mutex_init(&kpad->gpio_lock);
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error = gpiochip_add(&kpad->gc);
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if (error) {
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dev_err(dev, "gpiochip_add failed, err: %d\n", error);
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return error;
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}
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for (i = 0; i <= ADP_BANK(MAXGPIO); i++) {
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kpad->dat_out[i] = adp5588_read(kpad->client,
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GPIO_DAT_OUT1 + i);
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kpad->dir[i] = adp5588_read(kpad->client, GPIO_DIR1 + i);
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}
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if (gpio_data->setup) {
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error = gpio_data->setup(kpad->client,
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kpad->gc.base, kpad->gc.ngpio,
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gpio_data->context);
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if (error)
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dev_warn(dev, "setup failed, %d\n", error);
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}
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return 0;
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}
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static void __devexit adp5588_gpio_remove(struct device *dev)
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{
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struct adp5588_kpad *kpad = dev_get_drvdata(dev);
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const struct adp5588_kpad_platform_data *pdata = dev->platform_data;
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const struct adp5588_gpio_platform_data *gpio_data = pdata->gpio_data;
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int error;
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if (!kpad->export_gpio)
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return;
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if (gpio_data->teardown) {
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error = gpio_data->teardown(kpad->client,
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kpad->gc.base, kpad->gc.ngpio,
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gpio_data->context);
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if (error)
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dev_warn(dev, "teardown failed %d\n", error);
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}
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error = gpiochip_remove(&kpad->gc);
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if (error)
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dev_warn(dev, "gpiochip_remove failed %d\n", error);
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}
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#else
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static inline int adp5588_gpio_add(struct device *dev)
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{
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return 0;
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}
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static inline void adp5588_gpio_remove(struct device *dev)
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{
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}
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#endif
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static void adp5588_report_events(struct adp5588_kpad *kpad, int ev_cnt)
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{
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int i, j;
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@ -150,7 +340,8 @@ static irqreturn_t adp5588_irq(int irq, void *handle)
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static int __devinit adp5588_setup(struct i2c_client *client)
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{
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struct adp5588_kpad_platform_data *pdata = client->dev.platform_data;
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const struct adp5588_kpad_platform_data *pdata = client->dev.platform_data;
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const struct adp5588_gpio_platform_data *gpio_data = pdata->gpio_data;
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int i, ret;
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unsigned char evt_mode1 = 0, evt_mode2 = 0, evt_mode3 = 0;
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@ -184,6 +375,15 @@ static int __devinit adp5588_setup(struct i2c_client *client)
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ret |= adp5588_write(client, GPI_EM3, evt_mode3);
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}
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if (gpio_data) {
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for (i = 0; i <= ADP_BANK(MAXGPIO); i++) {
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int pull_mask = gpio_data->pullup_dis_mask;
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ret |= adp5588_write(client, GPIO_PULL1 + i,
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(pull_mask >> (8 * i)) & 0xFF);
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}
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}
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ret |= adp5588_write(client, INT_STAT, CMP2_INT | CMP1_INT |
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OVR_FLOW_INT | K_LCK_INT |
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GPI_INT | KE_INT); /* Status is W1C */
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@ -240,7 +440,7 @@ static int __devinit adp5588_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct adp5588_kpad *kpad;
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struct adp5588_kpad_platform_data *pdata = client->dev.platform_data;
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const struct adp5588_kpad_platform_data *pdata = client->dev.platform_data;
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struct input_dev *input;
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unsigned int revid;
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int ret, i;
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@ -381,6 +581,10 @@ static int __devinit adp5588_probe(struct i2c_client *client,
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if (kpad->gpimapsize)
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adp5588_report_switch_state(kpad);
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error = adp5588_gpio_add(&client->dev);
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if (error)
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goto err_free_irq;
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device_init_wakeup(&client->dev, 1);
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i2c_set_clientdata(client, kpad);
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@ -407,6 +611,7 @@ static int __devexit adp5588_remove(struct i2c_client *client)
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free_irq(client->irq, kpad);
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cancel_delayed_work_sync(&kpad->work);
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input_unregister_device(kpad->input);
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adp5588_gpio_remove(&client->dev);
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kfree(kpad);
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return 0;
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@ -123,6 +123,7 @@ struct adp5588_kpad_platform_data {
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unsigned short unlock_key2; /* Unlock Key 2 */
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const struct adp5588_gpi_map *gpimap;
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unsigned short gpimapsize;
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const struct adp5588_gpio_platform_data *gpio_data;
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};
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struct adp5588_gpio_platform_data {
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