diff options
Diffstat (limited to 'drivers/net/wireless/microchip/wilc1000/spi.c')
| -rw-r--r-- | drivers/net/wireless/microchip/wilc1000/spi.c | 80 |
1 files changed, 71 insertions, 9 deletions
diff --git a/drivers/net/wireless/microchip/wilc1000/spi.c b/drivers/net/wireless/microchip/wilc1000/spi.c index 640850f989dd..2c2ed4b09efd 100644 --- a/drivers/net/wireless/microchip/wilc1000/spi.c +++ b/drivers/net/wireless/microchip/wilc1000/spi.c @@ -8,10 +8,13 @@ #include <linux/spi/spi.h> #include <linux/crc7.h> #include <linux/crc-itu-t.h> +#include <linux/gpio/consumer.h> #include "netdev.h" #include "cfg80211.h" +#define SPI_MODALIAS "wilc1000_spi" + static bool enable_crc7; /* protect SPI commands with CRC7 */ module_param(enable_crc7, bool, 0644); MODULE_PARM_DESC(enable_crc7, @@ -43,6 +46,10 @@ struct wilc_spi { bool probing_crc; /* true if we're probing chip's CRC config */ bool crc7_enabled; /* true if crc7 is currently enabled */ bool crc16_enabled; /* true if crc16 is currently enabled */ + struct wilc_gpios { + struct gpio_desc *enable; /* ENABLE GPIO or NULL */ + struct gpio_desc *reset; /* RESET GPIO or NULL */ + } gpios; }; static const struct wilc_hif_func wilc_hif_spi; @@ -99,8 +106,6 @@ static int wilc_spi_reset(struct wilc *wilc); #define DATA_PKT_LOG_SZ DATA_PKT_LOG_SZ_MAX #define DATA_PKT_SZ (1 << DATA_PKT_LOG_SZ) -#define USE_SPI_DMA 0 - #define WILC_SPI_COMMAND_STAT_SUCCESS 0 #define WILC_GET_RESP_HDR_START(h) (((h) >> 4) & 0xf) @@ -152,6 +157,50 @@ struct wilc_spi_special_cmd_rsp { u8 status; } __packed; +static int wilc_parse_gpios(struct wilc *wilc) +{ + struct spi_device *spi = to_spi_device(wilc->dev); + struct wilc_spi *spi_priv = wilc->bus_data; + struct wilc_gpios *gpios = &spi_priv->gpios; + + /* get ENABLE pin and deassert it (if it is defined): */ + gpios->enable = devm_gpiod_get_optional(&spi->dev, + "enable", GPIOD_OUT_LOW); + /* get RESET pin and assert it (if it is defined): */ + if (gpios->enable) { + /* if enable pin exists, reset must exist as well */ + gpios->reset = devm_gpiod_get(&spi->dev, + "reset", GPIOD_OUT_HIGH); + if (IS_ERR(gpios->reset)) { + dev_err(&spi->dev, "missing reset gpio.\n"); + return PTR_ERR(gpios->reset); + } + } else { + gpios->reset = devm_gpiod_get_optional(&spi->dev, + "reset", GPIOD_OUT_HIGH); + } + return 0; +} + +static void wilc_wlan_power(struct wilc *wilc, bool on) +{ + struct wilc_spi *spi_priv = wilc->bus_data; + struct wilc_gpios *gpios = &spi_priv->gpios; + + if (on) { + /* assert ENABLE: */ + gpiod_set_value(gpios->enable, 1); + mdelay(5); + /* deassert RESET: */ + gpiod_set_value(gpios->reset, 0); + } else { + /* assert RESET: */ + gpiod_set_value(gpios->reset, 1); + /* deassert ENABLE: */ + gpiod_set_value(gpios->enable, 0); + } +} + static int wilc_bus_probe(struct spi_device *spi) { int ret; @@ -171,6 +220,10 @@ static int wilc_bus_probe(struct spi_device *spi) wilc->bus_data = spi_priv; wilc->dev_irq_num = spi->irq; + ret = wilc_parse_gpios(wilc); + if (ret < 0) + goto netdev_cleanup; + wilc->rtc_clk = devm_clk_get_optional(&spi->dev, "rtc"); if (IS_ERR(wilc->rtc_clk)) { ret = PTR_ERR(wilc->rtc_clk); @@ -190,9 +243,11 @@ free: static int wilc_bus_remove(struct spi_device *spi) { struct wilc *wilc = spi_get_drvdata(spi); + struct wilc_spi *spi_priv = wilc->bus_data; clk_disable_unprepare(wilc->rtc_clk); wilc_netdev_cleanup(wilc); + kfree(spi_priv); return 0; } @@ -203,11 +258,18 @@ static const struct of_device_id wilc_of_match[] = { }; MODULE_DEVICE_TABLE(of, wilc_of_match); +static const struct spi_device_id wilc_spi_id[] = { + { "wilc1000", 0 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(spi, wilc_spi_id); + static struct spi_driver wilc_spi_driver = { .driver = { - .name = MODALIAS, + .name = SPI_MODALIAS, .of_match_table = wilc_of_match, }, + .id_table = wilc_spi_id, .probe = wilc_bus_probe, .remove = wilc_bus_remove, }; @@ -240,7 +302,6 @@ static int wilc_spi_tx(struct wilc *wilc, u8 *b, u32 len) memset(&msg, 0, sizeof(msg)); spi_message_init(&msg); msg.spi = spi; - msg.is_dma_mapped = USE_SPI_DMA; spi_message_add_tail(&tr, &msg); ret = spi_sync(spi, &msg); @@ -284,7 +345,6 @@ static int wilc_spi_rx(struct wilc *wilc, u8 *rb, u32 rlen) memset(&msg, 0, sizeof(msg)); spi_message_init(&msg); msg.spi = spi; - msg.is_dma_mapped = USE_SPI_DMA; spi_message_add_tail(&tr, &msg); ret = spi_sync(spi, &msg); @@ -323,7 +383,6 @@ static int wilc_spi_tx_rx(struct wilc *wilc, u8 *wb, u8 *rb, u32 rlen) memset(&msg, 0, sizeof(msg)); spi_message_init(&msg); msg.spi = spi; - msg.is_dma_mapped = USE_SPI_DMA; spi_message_add_tail(&tr, &msg); ret = spi_sync(spi, &msg); @@ -977,9 +1036,10 @@ static int wilc_spi_reset(struct wilc *wilc) static int wilc_spi_deinit(struct wilc *wilc) { - /* - * TODO: - */ + struct wilc_spi *spi_priv = wilc->bus_data; + + spi_priv->isinit = false; + wilc_wlan_power(wilc, false); return 0; } @@ -1000,6 +1060,8 @@ static int wilc_spi_init(struct wilc *wilc, bool resume) dev_err(&spi->dev, "Fail cmd read chip id...\n"); } + wilc_wlan_power(wilc, true); + /* * configure protocol */ |