diff options
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/hid-mcp2221.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/drivers/hid/hid-mcp2221.c b/drivers/hid/hid-mcp2221.c index d958475f8c81..e1b93ce32e01 100644 --- a/drivers/hid/hid-mcp2221.c +++ b/drivers/hid/hid-mcp2221.c @@ -15,6 +15,7 @@ #include <linux/hid.h> #include <linux/hidraw.h> #include <linux/i2c.h> +#include <linux/gpio/driver.h> #include "hid-ids.h" /* Commands codes in a raw output report */ @@ -27,6 +28,8 @@ enum { MCP2221_I2C_PARAM_OR_STATUS = 0x10, MCP2221_I2C_SET_SPEED = 0x20, MCP2221_I2C_CANCEL = 0x10, + MCP2221_GPIO_SET = 0x50, + MCP2221_GPIO_GET = 0x51, }; /* Response codes in a raw input report */ @@ -42,6 +45,8 @@ enum { MCP2221_I2C_WRADDRL_SEND = 0x21, MCP2221_I2C_ADDR_NACK = 0x25, MCP2221_I2C_READ_COMPL = 0x55, + MCP2221_ALT_F_NOT_GPIOV = 0xEE, + MCP2221_ALT_F_NOT_GPIOD = 0xEF, }; /* @@ -59,6 +64,9 @@ struct mcp2221 { int rxbuf_idx; int status; u8 cur_i2c_clk_div; + struct gpio_chip *gc; + u8 gp_idx; + u8 gpio_dir; }; /* @@ -526,6 +534,110 @@ static const struct i2c_algorithm mcp_i2c_algo = { .functionality = mcp_i2c_func, }; +static int mcp_gpio_get(struct gpio_chip *gc, + unsigned int offset) +{ + int ret; + struct mcp2221 *mcp = gpiochip_get_data(gc); + + mcp->txbuf[0] = MCP2221_GPIO_GET; + + mcp->gp_idx = (offset + 1) * 2; + + mutex_lock(&mcp->lock); + ret = mcp_send_data_req_status(mcp, mcp->txbuf, 1); + mutex_unlock(&mcp->lock); + + return ret; +} + +static void mcp_gpio_set(struct gpio_chip *gc, + unsigned int offset, int value) +{ + struct mcp2221 *mcp = gpiochip_get_data(gc); + + memset(mcp->txbuf, 0, 18); + mcp->txbuf[0] = MCP2221_GPIO_SET; + + mcp->gp_idx = ((offset + 1) * 4) - 1; + + mcp->txbuf[mcp->gp_idx - 1] = 1; + mcp->txbuf[mcp->gp_idx] = !!value; + + mutex_lock(&mcp->lock); + mcp_send_data_req_status(mcp, mcp->txbuf, 18); + mutex_unlock(&mcp->lock); +} + +static int mcp_gpio_dir_set(struct mcp2221 *mcp, + unsigned int offset, u8 val) +{ + memset(mcp->txbuf, 0, 18); + mcp->txbuf[0] = MCP2221_GPIO_SET; + + mcp->gp_idx = (offset + 1) * 5; + + mcp->txbuf[mcp->gp_idx - 1] = 1; + mcp->txbuf[mcp->gp_idx] = val; + + return mcp_send_data_req_status(mcp, mcp->txbuf, 18); +} + +static int mcp_gpio_direction_input(struct gpio_chip *gc, + unsigned int offset) +{ + int ret; + struct mcp2221 *mcp = gpiochip_get_data(gc); + + mutex_lock(&mcp->lock); + ret = mcp_gpio_dir_set(mcp, offset, 0); + mutex_unlock(&mcp->lock); + + return ret; +} + +static int mcp_gpio_direction_output(struct gpio_chip *gc, + unsigned int offset, int value) +{ + int ret; + struct mcp2221 *mcp = gpiochip_get_data(gc); + + mutex_lock(&mcp->lock); + ret = mcp_gpio_dir_set(mcp, offset, 1); + mutex_unlock(&mcp->lock); + + /* Can't configure as output, bailout early */ + if (ret) + return ret; + + mcp_gpio_set(gc, offset, value); + + return 0; +} + +static int mcp_gpio_get_direction(struct gpio_chip *gc, + unsigned int offset) +{ + int ret; + struct mcp2221 *mcp = gpiochip_get_data(gc); + + mcp->txbuf[0] = MCP2221_GPIO_GET; + + mcp->gp_idx = (offset + 1) * 2; + + mutex_lock(&mcp->lock); + ret = mcp_send_data_req_status(mcp, mcp->txbuf, 1); + mutex_unlock(&mcp->lock); + + if (ret) + return ret; + + if (mcp->gpio_dir) + return GPIO_LINE_DIRECTION_IN; + + return GPIO_LINE_DIRECTION_OUT; +} + /* Gives current state of i2c engine inside mcp2221 */ static int mcp_get_i2c_eng_state(struct mcp2221 *mcp, u8 *data, u8 idx) @@ -638,6 +750,39 @@ static int mcp2221_raw_event(struct hid_device *hdev, complete(&mcp->wait_in_report); break; + case MCP2221_GPIO_GET: + switch (data[1]) { + case MCP2221_SUCCESS: + if ((data[mcp->gp_idx] == MCP2221_ALT_F_NOT_GPIOV) || + (data[mcp->gp_idx + 1] == MCP2221_ALT_F_NOT_GPIOD)) { + mcp->status = -ENOENT; + } else { + mcp->status = !!data[mcp->gp_idx]; + mcp->gpio_dir = !!data[mcp->gp_idx + 1]; + } + break; + default: + mcp->status = -EAGAIN; + } + complete(&mcp->wait_in_report); + break; + + case MCP2221_GPIO_SET: + switch (data[1]) { + case MCP2221_SUCCESS: + if ((data[mcp->gp_idx] == MCP2221_ALT_F_NOT_GPIOV) || + (data[mcp->gp_idx - 1] == MCP2221_ALT_F_NOT_GPIOV)) { + mcp->status = -ENOENT; + } else { + mcp->status = 0; + } + break; + default: + mcp->status = -EAGAIN; + } + complete(&mcp->wait_in_report); + break; + default: mcp->status = -EIO; complete(&mcp->wait_in_report); @@ -702,8 +847,32 @@ static int mcp2221_probe(struct hid_device *hdev, } i2c_set_adapdata(&mcp->adapter, mcp); + /* Setup GPIO chip */ + mcp->gc = devm_kzalloc(&hdev->dev, sizeof(*mcp->gc), GFP_KERNEL); + if (!mcp->gc) { + ret = -ENOMEM; + goto err_gc; + } + + mcp->gc->label = "mcp2221_gpio"; + mcp->gc->direction_input = mcp_gpio_direction_input; + mcp->gc->direction_output = mcp_gpio_direction_output; + mcp->gc->get_direction = mcp_gpio_get_direction; + mcp->gc->set = mcp_gpio_set; + mcp->gc->get = mcp_gpio_get; + mcp->gc->ngpio = 4; + mcp->gc->base = -1; + mcp->gc->can_sleep = 1; + mcp->gc->parent = &hdev->dev; + + ret = devm_gpiochip_add_data(&hdev->dev, mcp->gc, mcp); + if (ret) + goto err_gc; + return 0; +err_gc: + i2c_del_adapter(&mcp->adapter); err_i2c: hid_hw_close(mcp->hdev); err_hstop: |