diff options
Diffstat (limited to 'drivers/misc/eeprom')
| -rw-r--r-- | drivers/misc/eeprom/at24.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index 581ba640c741..e79833d62284 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -27,6 +27,7 @@ #include <linux/regmap.h> #include <linux/platform_data/at24.h> #include <linux/pm_runtime.h> +#include <linux/gpio/consumer.h> /* * I2C EEPROMs from most vendors are inexpensive and mostly interchangeable. @@ -77,6 +78,8 @@ struct at24_data { struct nvmem_config nvmem_config; struct nvmem_device *nvmem; + struct gpio_desc *wp_gpio; + /* * Some chips tie up multiple I2C addresses; dummy devices reserve * them for us, and we'll use them with SMBus calls. @@ -427,12 +430,14 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count) * from this host, but not from other I2C masters. */ mutex_lock(&at24->lock); + gpiod_set_value_cansleep(at24->wp_gpio, 0); while (count) { int status; status = at24_regmap_write(at24, buf, off, count); if (status < 0) { + gpiod_set_value_cansleep(at24->wp_gpio, 1); mutex_unlock(&at24->lock); pm_runtime_put(dev); return status; @@ -442,6 +447,7 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count) count -= status; } + gpiod_set_value_cansleep(at24->wp_gpio, 1); mutex_unlock(&at24->lock); pm_runtime_put(dev); @@ -573,6 +579,11 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) at24->num_addresses = num_addresses; at24->offset_adj = at24_get_offset_adj(chip.flags, chip.byte_len); + at24->wp_gpio = devm_gpiod_get_optional(&client->dev, + "wp", GPIOD_OUT_HIGH); + if (IS_ERR(at24->wp_gpio)) + return PTR_ERR(at24->wp_gpio); + at24->client[0].client = client; at24->client[0].regmap = devm_regmap_init_i2c(client, ®map_config); if (IS_ERR(at24->client[0].regmap)) |