Hi,
2021年7月7日(水) 16:17 Mathew McBride <matt@xxxxxxxxxxxxxxx>:
>
> The RX-8035 is a newer RTC from EPSON that is very
> similar to the RX-8025.
>
> The key difference is in the oscillation stop (XSTP)
> bit which is inverted on the RX-8035.
>
> Signed-off-by: Mathew McBride <matt@xxxxxxxxxxxxxxx>
> ---
> drivers/rtc/rtc-rx8025.c | 59 ++++++++++++++++++++++++++++++++++++----
> 1 file changed, 53 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/rtc/rtc-rx8025.c b/drivers/rtc/rtc-rx8025.c
> index c914091819ba..1a33ec402f4a 100644
> --- a/drivers/rtc/rtc-rx8025.c
> +++ b/drivers/rtc/rtc-rx8025.c
> @@ -60,14 +60,24 @@
> #define RX8025_ADJ_DATA_MAX 62
> #define RX8025_ADJ_DATA_MIN -62
>
> +enum rx_model {
> + model_rx_unknown,
> + model_rx_8025,
> + model_rx_8035,
> + model_last
> +};
> +
> static const struct d rx8025_id[] = {
> - { "rx8025", 0 },
> + { "rx8025", model_rx_8025 },
> + { "rx8035", model_rx_8035 },
> { }
> };
> +
> MODULE_DEVICE_TABLE(i2c, rx8025_id);
>
> struct rx8025_data {
> struct rtc_device *rtc;
> + enum rx_model type;
I think 'model' is easier to understand than 'type'.
> u8 ctrl1;
> };
>
> @@ -100,10 +110,26 @@ static s32 rx8025_write_regs(const struct i2c_client *client,
> length, values);
> }
>
> +static int rx8025_is_osc_stopped(enum rx_model model, int ctrl2)
> +{
> + int xstp = ctrl2 & RX8025_BIT_CTRL2_XST;
> + /* XSTP bit has different polarity on RX-8025 vs RX-8035.
> + * RX-8025: 0 == oscillator stopped
> + * RX-8035: 1 == oscillator stopped
> + */
> +
> + if (model == model_rx_8025)
> + xstp = !xstp;
> +
> + return xstp;
> +}
> +
> static int rx8025_check_validity(struct device *dev)
> {
> struct i2c_client *client = to_i2c_client(dev);
> + struct rx8025_data *drvdata = dev_get_drvdata(dev);
> int ctrl2;
> + int xstp;
>
> ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
> if (ctrl2 < 0)
> @@ -117,7 +143,8 @@ static int rx8025_check_validity(struct device *dev)
> return -EINVAL;
> }
>
> - if (!(ctrl2 & RX8025_BIT_CTRL2_XST)) {
> + xstp = rx8025_is_osc_stopped(drvdata->type, ctrl2);
> + if (xstp) {
> dev_warn(dev, "crystal stopped, date is invalid\n");
> return -EINVAL;
> }
> @@ -125,7 +152,7 @@ static int rx8025_check_validity(struct device *dev)
> return 0;
> }
>
> -static int rx8025_reset_validity(struct i2c_client *client)
> +static int rx8025_reset_validity(enum rx_model model, struct i2c_client *client)
We can get the struct rx8025_data by using i2c_get_clientdata().
Therefore, I think that it can be updated without increasing the arguments.
```
struct rx8025_data *rx8025 = i2c_get_clientdata(client);
if (rx8025->type == model_rx_8025)
```
> {
> int ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
>
> @@ -134,8 +161,13 @@ static int rx8025_reset_validity(struct i2c_client *client)
>
> ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET);
>
> + if (model == model_rx_8025)
> + ctrl2 |= RX8025_BIT_CTRL2_XST;
> + else
> + ctrl2 &= ~(RX8025_BIT_CTRL2_XST);
> +
> return rx8025_write_reg(client, RX8025_REG_CTRL2,
> - ctrl2 | RX8025_BIT_CTRL2_XST);
> + ctrl2);
> }
>
> static irqreturn_t rx8025_handle_irq(int irq, void *dev_id)
> @@ -149,7 +181,7 @@ static irqreturn_t (int irq, void *dev_id)
> if (status < 0)
> goto out;
>
> - if (!(status & RX8025_BIT_CTRL2_XST))
> + if (rx8025_is_osc_stopped(rx8025->type, status))
In rx8025_check_validity(), the return value is put in xstp and confirmed.
I thought it would be better to unify to either one.
> dev_warn(&client->dev, "Oscillation stop was detected,"
> "you may have to readjust the clock\n");
>
> @@ -241,7 +273,7 @@ static int rx8025_set_time(struct device *dev, struct rtc_time *dt)
> if (ret < 0)
> return ret;
>
> - return rx8025_reset_validity(client);
> + return rx8025_reset_validity(rx8025->type, client);
> }
>
> static int rx8025_init_client(struct i2c_client *client)
> @@ -519,6 +551,21 @@ static int rx8025_probe(struct i2c_client *client,
>
> i2c_set_clientdata(client, rx8025);
>
> + if (id) {
> + rx8025->type = id->driver_data;
> + switch (rx8025->type) {
> + case model_rx_8025:
> + dev_info(&client->dev, "Type RX-8025");
> + break;
Please fix indent.
> + case model_rx_8035:
> + dev_info(&client->dev, "Type RX-8035");
> + break;
> + default:
> + dev_warn(&client->dev, "Unknown type: %d\n", rx8025->type);
> + break;
ditto.
> + }
> + }
> +
> err = rx8025_init_client(client);
> if (err)
> return err;
> --
> 2.30.1
>
Best regards,
Nobuhiro
--
Nobuhiro Iwamatsu
iwamatsu at {nigauri.org / debian.org / kernel.org}
GPG ID: 40AD1FA6
