diff options
Diffstat (limited to 'drivers/spi/spi_gpio.c')
| -rw-r--r-- | drivers/spi/spi_gpio.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/spi/spi_gpio.c b/drivers/spi/spi_gpio.c index d2866c293dee..26bd03e61855 100644 --- a/drivers/spi/spi_gpio.c +++ b/drivers/spi/spi_gpio.c | |||
| @@ -178,8 +178,10 @@ static void spi_gpio_chipselect(struct spi_device *spi, int is_active) | |||
| 178 | if (is_active) | 178 | if (is_active) |
| 179 | setsck(spi, spi->mode & SPI_CPOL); | 179 | setsck(spi, spi->mode & SPI_CPOL); |
| 180 | 180 | ||
| 181 | /* SPI is normally active-low */ | 181 | if (cs != SPI_GPIO_NO_CHIPSELECT) { |
| 182 | gpio_set_value(cs, (spi->mode & SPI_CS_HIGH) ? is_active : !is_active); | 182 | /* SPI is normally active-low */ |
| 183 | gpio_set_value(cs, (spi->mode & SPI_CS_HIGH) ? is_active : !is_active); | ||
| 184 | } | ||
| 183 | } | 185 | } |
| 184 | 186 | ||
| 185 | static int spi_gpio_setup(struct spi_device *spi) | 187 | static int spi_gpio_setup(struct spi_device *spi) |
| @@ -191,15 +193,17 @@ static int spi_gpio_setup(struct spi_device *spi) | |||
| 191 | return -EINVAL; | 193 | return -EINVAL; |
| 192 | 194 | ||
| 193 | if (!spi->controller_state) { | 195 | if (!spi->controller_state) { |
| 194 | status = gpio_request(cs, dev_name(&spi->dev)); | 196 | if (cs != SPI_GPIO_NO_CHIPSELECT) { |
| 195 | if (status) | 197 | status = gpio_request(cs, dev_name(&spi->dev)); |
| 196 | return status; | 198 | if (status) |
| 197 | status = gpio_direction_output(cs, spi->mode & SPI_CS_HIGH); | 199 | return status; |
| 200 | status = gpio_direction_output(cs, spi->mode & SPI_CS_HIGH); | ||
| 201 | } | ||
| 198 | } | 202 | } |
| 199 | if (!status) | 203 | if (!status) |
| 200 | status = spi_bitbang_setup(spi); | 204 | status = spi_bitbang_setup(spi); |
| 201 | if (status) { | 205 | if (status) { |
| 202 | if (!spi->controller_state) | 206 | if (!spi->controller_state && cs != SPI_GPIO_NO_CHIPSELECT) |
| 203 | gpio_free(cs); | 207 | gpio_free(cs); |
| 204 | } | 208 | } |
| 205 | return status; | 209 | return status; |
| @@ -209,7 +213,8 @@ static void spi_gpio_cleanup(struct spi_device *spi) | |||
| 209 | { | 213 | { |
| 210 | unsigned long cs = (unsigned long) spi->controller_data; | 214 | unsigned long cs = (unsigned long) spi->controller_data; |
| 211 | 215 | ||
| 212 | gpio_free(cs); | 216 | if (cs != SPI_GPIO_NO_CHIPSELECT) |
| 217 | gpio_free(cs); | ||
| 213 | spi_bitbang_cleanup(spi); | 218 | spi_bitbang_cleanup(spi); |
| 214 | } | 219 | } |
| 215 | 220 | ||
