Re: [PATCH 6/7] Input: sx8654 - add sx8650 support

Dmitry Torokhov
2018-10-16T17:48:45Z

On Tue, Oct 16, 2018 at 11:22:48AM +0200, Richard Leitner wrote:
> The sx8654 and sx8650 are quite similar, therefore add support for the
> sx8650 within the sx8654 driver.
>
> Signed-off-by: Richard Leitner <richard.leitner@skidata.com>
> ---
> drivers/input/touchscreen/sx8654.c | 186 ++++++++++++++++++++++++++++++++-----
> 1 file changed, 163 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/input/touchscreen/sx8654.c b/drivers/input/touchscreen/sx8654.c
> index 622283b49d7c..33f7a0be4ef8 100644
> --- a/drivers/input/touchscreen/sx8654.c
> +++ b/drivers/input/touchscreen/sx8654.c
> @@ -29,12 +29,13 @@
>
> #include <linux/input.h>
> #include <linux/module.h>
> -#include <linux/of.h>
> +#include <linux/of_device.h>
> #include <linux/i2c.h>
> #include <linux/interrupt.h>
> #include <linux/irq.h>
> #include <linux/gpio/consumer.h>
> #include <linux/delay.h>
> +#include <linux/hrtimer.h>
>
> /* register addresses */
> #define I2C_REG_TOUCH0 0x00
> @@ -44,9 +45,11 @@
> #define I2C_REG_IRQSRC 0x23
> #define I2C_REG_SOFTRESET 0x3f
>
> +#define I2C_REG_SX8650_STAT 0x05
> +#define SX8650_STAT_CONVIRQ BIT(7)
> +
> /* commands */
> #define CMD_READ_REGISTER 0x40
> -#define CMD_MANUAL 0xc0
> #define CMD_PENTRG 0xe0
>
> /* value for I2C_REG_SOFTRESET */
> @@ -58,11 +61,12 @@
>
> /* bits for RegTouch1 */
> #define CONDIRQ 0x20
> +#define RPDNT_100K 0x00
> #define FILT_7SA 0x03
>
> /* bits for I2C_REG_CHANMASK */
> -#define CONV_X 0x80
> -#define CONV_Y 0x40
> +#define CONV_X BIT(7)
> +#define CONV_Y BIT(6)

If you are using BIT() you need to include include/linux/bitops.h

I also would prefer conversion to using BIT() as a separate patch.

>
> /* coordinates rate: higher nibble of CTRL0 register */
> #define RATE_MANUAL 0x00
> @@ -71,14 +75,110 @@
> /* power delay: lower nibble of CTRL0 register */
> #define POWDLY_1_1MS 0x0b
>
> +/* for sx8650, as we have no pen release IRQ there: timeout in ns following the
> + * last PENIRQ after which we assume the pen is lifted.
> + */
> +#define SX8650_PENIRQ_TIMEOUT (80 * 1100 * 1000)
> +
> #define MAX_12BIT ((1 << 12) - 1)
> +#define MAX_I2C_READ_LEN 10 /* see datasheet section 5.1.5 */
> +
> +/* channel definition */
> +#define CH_X 0x00
> +#define CH_Y 0x01
> +
> +struct sx865x_data {
> + u8 cmd_manual;
> + u8 chan_mask;
> + u8 has_irq_penrelease;
> + u8 has_reg_irqmask;
> + irq_handler_t irqh;
> +};
>
> struct sx8654 {
> struct input_dev *input;
> struct i2c_client *client;
> struct gpio_desc *gpio_reset;
> + struct hrtimer timer;

Does this have to be hrtimer? Can regular timer be used?

> +
> + const struct sx865x_data *data;
> };
>
> +static enum hrtimer_restart sx865x_penrelease_timer_handler(struct hrtimer *h)
> +{
> + struct sx8654 *ts = container_of(h, struct sx8654, timer);
> +
> + input_report_key(ts->input, BTN_TOUCH, 0);
> + input_sync(ts->input);
> + dev_dbg(&ts->client->dev, "penrelease by timer\n");
> +
> + return HRTIMER_NORESTART;
> +}
> +
> +static irqreturn_t sx8650_irq(int irq, void *handle)
> +{
> + struct sx8654 *ts = handle;
> + struct device *dev = &ts->client->dev;
> + int len, i, ret;
> + u8 stat;
> + u16 x, y;
> + u8 data[MAX_I2C_READ_LEN];
> + u16 ch;
> + u16 chdata;
> + u8 readlen = hweight32(ts->data->chan_mask) * 2;
> +
> + stat = i2c_smbus_read_byte_data(ts->client, CMD_READ_REGISTER
> + | I2C_REG_SX8650_STAT);
> +
> + if (!(stat & SX8650_STAT_CONVIRQ)) {
> + dev_dbg(dev, "%s ignore stat [0x%02x]", __func__, stat);
> + return IRQ_HANDLED;
> + }
> +
> + len = i2c_master_recv(ts->client, data, readlen);
> + if (len != readlen) {
> + dev_dbg(dev, "ignore short recv (%d)\n", len);
> + return IRQ_HANDLED;
> + }
> +
> + ret = hrtimer_try_to_cancel(&ts->timer);
> +
> + x = 0;
> + y = 0;
> + for (i = 0; (i + 1) < len; i++) {
> + chdata = data[i] << 8;
> + i++;
> + chdata += data[i];
> +
> + if (unlikely(chdata == 0xFFFF)) {
> + dev_dbg(dev, "invalid qualified data @ %d\n", i);
> + continue;
> + } else if (unlikely(chdata & 0x8000)) {
> + dev_warn(dev, "hibit @ %d [0x%04x]\n", i, chdata);
> + continue;
> + }
> +
> + ch = chdata >> 12;
> + if (ch == CH_X)
> + x = chdata & MAX_12BIT;
> + else if (ch == CH_Y)
> + y = chdata & MAX_12BIT;
> + else
> + dev_warn(dev, "unknown channel %d [0x%04x]\n", ch,
> + chdata);
> + }
> +
> + input_report_abs(ts->input, ABS_X, x);
> + input_report_abs(ts->input, ABS_Y, y);
> + input_report_key(ts->input, BTN_TOUCH, 1);
> + input_sync(ts->input);
> + dev_dbg(dev, "point(%4d,%4d)\n", x, y);
> +
> + hrtimer_start(&ts->timer, ktime_set(0, SX8650_PENIRQ_TIMEOUT),
> + HRTIMER_MODE_REL);
> + return IRQ_HANDLED;
> +}
> +
> static irqreturn_t sx8654_irq(int irq, void *handle)
> {
> struct sx8654 *sx8654 = handle;
> @@ -127,6 +227,22 @@ static irqreturn_t sx8654_irq(int irq, void *handle)
> return IRQ_HANDLED;
> }
>
> +static const struct sx865x_data sx8650_data = {
> + .cmd_manual = 0xb0,
> + .has_irq_penrelease = 0,
> + .has_reg_irqmask = 0,
> + .chan_mask = (CONV_X | CONV_Y),
> + .irqh = sx8650_irq,
> +};
> +
> +static const struct sx865x_data sx8654_data = {
> + .cmd_manual = 0xc0,
> + .has_irq_penrelease = 1,
> + .has_reg_irqmask = 1,
> + .chan_mask = (CONV_X | CONV_Y),
> + .irqh = sx8654_irq,
> +};
> +
> static int sx8654_reset(struct sx8654 *ts)
> {
> int err;
> @@ -182,13 +298,13 @@ static void sx8654_close(struct input_dev *dev)
> disable_irq(client->irq);
>
> /* enable manual mode mode */
> - error = i2c_smbus_write_byte(client, CMD_MANUAL);
> + error = i2c_smbus_write_byte(client, sx8654->data->cmd_manual);
> if (error) {
> dev_err(&client->dev, "writing command CMD_MANUAL failed");
> return;
> }
>
> - error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, 0);
> + error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, RATE_MANUAL);
> if (error) {
> dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
> return;
> @@ -196,10 +312,30 @@ static void sx8654_close(struct input_dev *dev)
> }
>
> #ifdef CONFIG_OF
> +static const struct of_device_id sx8654_of_match[] = {
> + {
> + .compatible = "semtech,sx8650",
> + .data = &sx8650_data,
> + }, {
> + .compatible = "semtech,sx8654",
> + .data = &sx8654_data,
> + }, {
> + .compatible = "semtech,sx8655",
> + .data = &sx8654_data,
> + }, {
> + .compatible = "semtech,sx8656",
> + .data = &sx8654_data,
> + }, {},
> +};
> +MODULE_DEVICE_TABLE(of, sx8654_of_match);
> +
> static int sx8654_get_ofdata(struct sx8654 *ts)
> {
> struct device *dev = &ts->client->dev;
> struct device_node *node = dev->of_node;
> + const struct of_device_id *of_id = of_match_device(sx8654_of_match,
> + dev);

If you use of_device_get_match_data() you do not need to move device
table around.

> + const struct sx865x_data *data = (struct sx865x_data *)of_id->data;
> int err;
>
> if (!node) {
> @@ -207,6 +343,8 @@ static int sx8654_get_ofdata(struct sx8654 *ts)
> return 0;
> }
>
> + ts->data = data;
> +
> ts->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
> if (PTR_ERR(ts->gpio_reset) == -EPROBE_DEFER) {
> return -EPROBE_DEFER;
> @@ -219,18 +357,11 @@ static int sx8654_get_ofdata(struct sx8654 *ts)
>
> return 0;
> }
> -
> -static const struct of_device_id sx8654_of_match[] = {
> - { .compatible = "semtech,sx8654", },
> - { .compatible = "semtech,sx8655", },
> - { .compatible = "semtech,sx8656", },
> - { },
> -};
> -MODULE_DEVICE_TABLE(of, sx8654_of_match);
> #else /* CONFIG_OF */
> static int sx8654_get_ofdata(struct sx8654 *ts)
> {
> ts->gpio_reset = NULL;
> + ts->data = &sx8654_data;
> return 0;
> }
> #endif /* CONFIG_OF */
> @@ -258,6 +389,12 @@ static int sx8654_probe(struct i2c_client *client,
> return error;
> }
>
> + if (!sx8654->data->has_irq_penrelease) {
> + dev_dbg(&client->dev, "use timer for penrelease\n");
> + hrtimer_init(&sx8654->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
> + sx8654->timer.function = sx865x_penrelease_timer_handler;
> + }
> +
> input = devm_input_allocate_device(&client->dev);
> if (!input)
> return -ENOMEM;
> @@ -284,29 +421,31 @@ static int sx8654_probe(struct i2c_client *client,
> }
>
> error = i2c_smbus_write_byte_data(client, I2C_REG_CHANMASK,
> - CONV_X | CONV_Y);
> + sx8654->data->chan_mask);
> if (error) {
> dev_err(&client->dev, "writing to I2C_REG_CHANMASK failed");
> return error;
> }
>
> - error = i2c_smbus_write_byte_data(client, I2C_REG_IRQMASK,
> - IRQ_PENTOUCH_TOUCHCONVDONE |
> - IRQ_PENRELEASE);
> - if (error) {
> - dev_err(&client->dev, "writing to I2C_REG_IRQMASK failed");
> - return error;
> + if (sx8654->data->has_reg_irqmask) {
> + error = i2c_smbus_write_byte_data(client, I2C_REG_IRQMASK,
> + IRQ_PENTOUCH_TOUCHCONVDONE |
> + IRQ_PENRELEASE);
> + if (error) {
> + dev_err(&client->dev, "writing I2C_REG_IRQMASK failed");
> + return error;
> + }
> }
>
> error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH1,
> - CONDIRQ | FILT_7SA);
> + CONDIRQ | RPDNT_100K | FILT_7SA);
> if (error) {
> dev_err(&client->dev, "writing to I2C_REG_TOUCH1 failed");
> return error;
> }
>
> error = devm_request_threaded_irq(&client->dev, client->irq,
> - NULL, sx8654_irq,
> + NULL, sx8654->data->irqh,
> IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> client->name, sx8654);
> if (error) {
> @@ -327,6 +466,7 @@ static int sx8654_probe(struct i2c_client *client,
> }
>
> static const struct i2c_device_id sx8654_id_table[] = {
> + { "semtech_sx8650", 0 },

Can we add the data here as well?

> { "semtech_sx8654", 0 },
> { "semtech_sx8655", 0 },
> { "semtech_sx8656", 0 },
> --
> 2.11.0
>

Thanks.

--
Dmitry