diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-cht-wc.c | 29 |
1 files changed, 19 insertions, 10 deletions
diff --git a/drivers/i2c/busses/i2c-cht-wc.c b/drivers/i2c/busses/i2c-cht-wc.c index 09e0df49df6b..11f7e516f1b1 100644 --- a/drivers/i2c/busses/i2c-cht-wc.c +++ b/drivers/i2c/busses/i2c-cht-wc.c @@ -55,7 +55,8 @@ struct cht_wc_i2c_adap { int client_irq; u8 irq_mask; u8 old_irq_mask; - bool nack; + int read_data; + bool io_error; bool done; }; @@ -76,6 +77,11 @@ static irqreturn_t cht_wc_i2c_adap_thread_handler(int id, void *data) reg &= ~adap->irq_mask; + /* Reads must be acked after reading the received data. */ + ret = regmap_read(adap->regmap, CHT_WC_I2C_RDDATA, &adap->read_data); + if (ret) + adap->io_error = true; + /* * Immediately ack IRQs, so that if new IRQs arrives while we're * handling the previous ones our irq will re-trigger when we're done. @@ -85,7 +91,7 @@ static irqreturn_t cht_wc_i2c_adap_thread_handler(int id, void *data) dev_err(&adap->adapter.dev, "Error writing extchgrirq reg\n"); if (reg & CHT_WC_EXTCHGRIRQ_ADAP_IRQMASK) { - adap->nack = !!(reg & CHT_WC_EXTCHGRIRQ_NACK_IRQ); + adap->io_error |= !!(reg & CHT_WC_EXTCHGRIRQ_NACK_IRQ); adap->done = true; } @@ -125,10 +131,10 @@ static int cht_wc_i2c_adap_smbus_xfer(struct i2c_adapter *_adap, u16 addr, union i2c_smbus_data *data) { struct cht_wc_i2c_adap *adap = i2c_get_adapdata(_adap); - int ret, reg; + int ret; mutex_lock(&adap->adap_lock); - adap->nack = false; + adap->io_error = false; adap->done = false; mutex_unlock(&adap->adap_lock); @@ -159,12 +165,10 @@ static int cht_wc_i2c_adap_smbus_xfer(struct i2c_adapter *_adap, u16 addr, ret = 0; mutex_lock(&adap->adap_lock); - if (adap->nack) + if (adap->io_error) ret = -EIO; - else if (read_write == I2C_SMBUS_READ) { - ret = regmap_read(adap->regmap, CHT_WC_I2C_RDDATA, ®); - data->byte = reg; - } + else if (read_write == I2C_SMBUS_READ) + data->byte = adap->read_data; mutex_unlock(&adap->adap_lock); return ret; @@ -238,7 +242,7 @@ static int cht_wc_i2c_adap_i2c_probe(struct platform_device *pdev) .addr = 0x6b, .properties = bq24190_props, }; - int ret, irq; + int ret, reg, irq; irq = platform_get_irq(pdev, 0); if (irq < 0) { @@ -264,6 +268,11 @@ static int cht_wc_i2c_adap_i2c_probe(struct platform_device *pdev) /* Clear and activate i2c-adapter interrupts, disable client IRQ */ adap->old_irq_mask = adap->irq_mask = ~CHT_WC_EXTCHGRIRQ_ADAP_IRQMASK; + + ret = regmap_read(adap->regmap, CHT_WC_I2C_RDDATA, ®); + if (ret) + return ret; + ret = regmap_write(adap->regmap, CHT_WC_EXTCHGRIRQ, ~adap->irq_mask); if (ret) return ret; |