Input: tsc2007 - add device tree support.
Signed-off-by: Denis Carikli <denis@eukrea.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>hifive-unleashed-5.1
Denis Carikli
Dmitry Torokhov
parent
bd77c32194
commit
07f9e5cf8e
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@ -0,0 +1,41 @@
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* Texas Instruments tsc2007 touchscreen controller
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Required properties:
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- compatible: must be "ti,tsc2007".
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- reg: I2C address of the chip.
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- ti,x-plate-ohms: X-plate resistance in ohms.
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Optional properties:
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- gpios: the interrupt gpio the chip is connected to (trough the penirq pin).
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The penirq pin goes to low when the panel is touched.
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(see GPIO binding[1] for more details).
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- interrupt-parent: the phandle for the gpio controller
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(see interrupt binding[0]).
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- interrupts: (gpio) interrupt to which the chip is connected
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(see interrupt binding[0]).
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- ti,max-rt: maximum pressure.
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- ti,fuzzx: specifies the absolute input fuzz x value.
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If set, it will permit noise in the data up to +- the value given to the fuzz
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parameter, that is used to filter noise from the event stream.
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- ti,fuzzy: specifies the absolute input fuzz y value.
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- ti,fuzzz: specifies the absolute input fuzz z value.
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- ti,poll-period: how much time to wait (in milliseconds) before reading again the
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values from the tsc2007.
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[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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[1]: Documentation/devicetree/bindings/gpio/gpio.txt
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Example:
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&i2c1 {
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/* ... */
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tsc2007@49 {
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compatible = "ti,tsc2007";
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reg = <0x49>;
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interrupt-parent = <&gpio4>;
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interrupts = <0x0 0x8>;
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gpios = <&gpio4 0 0>;
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ti,x-plate-ohms = <180>;
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};
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/* ... */
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};
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@ -53,7 +53,7 @@ static const struct imxi2c_platform_data
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};
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#define TSC2007_IRQGPIO IMX_GPIO_NR(3, 2)
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static int tsc2007_get_pendown_state(void)
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static int tsc2007_get_pendown_state(struct device *dev)
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{
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return !gpio_get_value(TSC2007_IRQGPIO);
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}
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@ -121,7 +121,7 @@ static const struct imxuart_platform_data uart_pdata __initconst = {
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.flags = IMXUART_HAVE_RTSCTS,
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};
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static int tsc2007_get_pendown_state(void)
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static int tsc2007_get_pendown_state(struct device *dev)
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{
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if (mx51_revision() < IMX_CHIP_REVISION_3_0)
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return !gpio_get_value(TSC2007_IRQGPIO_REV2);
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@ -501,7 +501,7 @@ static struct platform_device keysc_device = {
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/* TouchScreen */
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#define IRQ0 evt2irq(0x600)
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static int ts_get_pendown_state(void)
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static int ts_get_pendown_state(struct device *dev)
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{
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int val = 0;
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gpio_free(GPIO_FN_INTC_IRQ0);
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@ -26,6 +26,9 @@
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/i2c/tsc2007.h>
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#include <linux/of_device.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#define TSC2007_MEASURE_TEMP0 (0x0 << 4)
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#define TSC2007_MEASURE_AUX (0x2 << 4)
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@ -74,13 +77,17 @@ struct tsc2007 {
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u16 max_rt;
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unsigned long poll_delay;
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unsigned long poll_period;
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int fuzzx;
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int fuzzy;
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int fuzzz;
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unsigned gpio;
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int irq;
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wait_queue_head_t wait;
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bool stopped;
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int (*get_pendown_state)(void);
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int (*get_pendown_state)(struct device *);
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void (*clear_penirq)(void);
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};
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@ -161,7 +168,7 @@ static bool tsc2007_is_pen_down(struct tsc2007 *ts)
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if (!ts->get_pendown_state)
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return true;
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return ts->get_pendown_state();
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return ts->get_pendown_state(&ts->client->dev);
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}
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static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
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@ -178,7 +185,7 @@ static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
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rt = tsc2007_calculate_pressure(ts, &tc);
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if (rt == 0 && !ts->get_pendown_state) {
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if (!rt && !ts->get_pendown_state) {
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/*
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* If pressure reported is 0 and we don't have
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* callback to check pendown state, we have to
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@ -228,7 +235,7 @@ static irqreturn_t tsc2007_hard_irq(int irq, void *handle)
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{
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struct tsc2007 *ts = handle;
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if (!ts->get_pendown_state || likely(ts->get_pendown_state()))
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if (tsc2007_is_pen_down(ts))
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return IRQ_WAKE_THREAD;
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if (ts->clear_penirq)
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@ -273,35 +280,74 @@ static void tsc2007_close(struct input_dev *input_dev)
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tsc2007_stop(ts);
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}
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static int tsc2007_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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#ifdef CONFIG_OF
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static int tsc2007_get_pendown_state_gpio(struct device *dev)
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{
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struct tsc2007 *ts;
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struct tsc2007_platform_data *pdata = client->dev.platform_data;
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struct input_dev *input_dev;
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int err;
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struct i2c_client *client = to_i2c_client(dev);
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struct tsc2007 *ts = i2c_get_clientdata(client);
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if (!pdata) {
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dev_err(&client->dev, "platform data is required!\n");
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return !gpio_get_value(ts->gpio);
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}
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static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts)
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{
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struct device_node *np = client->dev.of_node;
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u32 val32;
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u64 val64;
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if (!np) {
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dev_err(&client->dev, "missing device tree data\n");
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return -EINVAL;
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}
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_WORD_DATA))
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return -EIO;
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if (!of_property_read_u32(np, "ti,max-rt", &val32))
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ts->max_rt = val32;
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else
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ts->max_rt = MAX_12BIT;
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ts = kzalloc(sizeof(struct tsc2007), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!ts || !input_dev) {
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err = -ENOMEM;
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goto err_free_mem;
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if (!of_property_read_u32(np, "ti,fuzzx", &val32))
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ts->fuzzx = val32;
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if (!of_property_read_u32(np, "ti,fuzzy", &val32))
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ts->fuzzy = val32;
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if (!of_property_read_u32(np, "ti,fuzzz", &val32))
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ts->fuzzz = val32;
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if (!of_property_read_u64(np, "ti,poll-period", &val64))
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ts->poll_period = val64;
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else
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ts->poll_period = 1;
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if (!of_property_read_u32(np, "ti,x-plate-ohms", &val32)) {
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ts->x_plate_ohms = val32;
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} else {
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dev_err(&client->dev, "missing ti,x-plate-ohms devicetree property.");
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return -EINVAL;
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}
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ts->client = client;
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ts->irq = client->irq;
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ts->input = input_dev;
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init_waitqueue_head(&ts->wait);
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ts->gpio = of_get_gpio(np, 0);
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if (gpio_is_valid(ts->gpio))
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ts->get_pendown_state = tsc2007_get_pendown_state_gpio;
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else
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dev_warn(&client->dev,
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"GPIO not specified in DT (of_get_gpio returned %d)\n",
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ts->gpio);
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return 0;
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}
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#else
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static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts)
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{
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dev_err(&client->dev, "platform data is required!\n");
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return -EINVAL;
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}
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#endif
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static int tsc2007_probe_pdev(struct i2c_client *client, struct tsc2007 *ts,
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const struct tsc2007_platform_data *pdata,
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const struct i2c_device_id *id)
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{
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ts->model = pdata->model;
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ts->x_plate_ohms = pdata->x_plate_ohms;
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ts->max_rt = pdata->max_rt ? : MAX_12BIT;
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@ -309,13 +355,54 @@ static int tsc2007_probe(struct i2c_client *client,
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ts->poll_period = pdata->poll_period ? : 1;
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ts->get_pendown_state = pdata->get_pendown_state;
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ts->clear_penirq = pdata->clear_penirq;
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ts->fuzzx = pdata->fuzzx;
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ts->fuzzy = pdata->fuzzy;
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ts->fuzzz = pdata->fuzzz;
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if (pdata->x_plate_ohms == 0) {
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dev_err(&client->dev, "x_plate_ohms is not set up in platform data");
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err = -EINVAL;
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goto err_free_mem;
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return -EINVAL;
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}
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return 0;
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}
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static int tsc2007_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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const struct tsc2007_platform_data *pdata = dev_get_platdata(&client->dev);
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struct tsc2007 *ts;
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struct input_dev *input_dev;
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int err;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_WORD_DATA))
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return -EIO;
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ts = devm_kzalloc(&client->dev, sizeof(struct tsc2007), GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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if (pdata)
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err = tsc2007_probe_pdev(client, ts, pdata, id);
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else
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err = tsc2007_probe_dt(client, ts);
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if (err)
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return err;
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input_dev = input_allocate_device();
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if (!input_dev) {
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err = -ENOMEM;
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goto err_free_input;
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};
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i2c_set_clientdata(client, ts);
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ts->client = client;
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ts->irq = client->irq;
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ts->input = input_dev;
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init_waitqueue_head(&ts->wait);
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snprintf(ts->phys, sizeof(ts->phys),
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"%s/input0", dev_name(&client->dev));
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@ -331,19 +418,19 @@ static int tsc2007_probe(struct i2c_client *client,
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, pdata->fuzzx, 0);
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input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, pdata->fuzzy, 0);
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input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, ts->fuzzx, 0);
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input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, ts->fuzzy, 0);
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input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT,
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pdata->fuzzz, 0);
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ts->fuzzz, 0);
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if (pdata->init_platform_hw)
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if (pdata && pdata->init_platform_hw)
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pdata->init_platform_hw();
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err = request_threaded_irq(ts->irq, tsc2007_hard_irq, tsc2007_soft_irq,
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IRQF_ONESHOT, client->dev.driver->name, ts);
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if (err < 0) {
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dev_err(&client->dev, "irq %d busy?\n", ts->irq);
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goto err_free_mem;
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goto err_free_input;
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}
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tsc2007_stop(ts);
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@ -352,28 +439,25 @@ static int tsc2007_probe(struct i2c_client *client,
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if (err)
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goto err_free_irq;
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i2c_set_clientdata(client, ts);
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return 0;
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err_free_irq:
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free_irq(ts->irq, ts);
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if (pdata->exit_platform_hw)
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if (pdata && pdata->exit_platform_hw)
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pdata->exit_platform_hw();
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err_free_mem:
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err_free_input:
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input_free_device(input_dev);
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kfree(ts);
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return err;
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}
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static int tsc2007_remove(struct i2c_client *client)
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{
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struct tsc2007 *ts = i2c_get_clientdata(client);
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struct tsc2007_platform_data *pdata = client->dev.platform_data;
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const struct tsc2007_platform_data *pdata = dev_get_platdata(&client->dev);
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struct tsc2007 *ts = i2c_get_clientdata(client);
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free_irq(ts->irq, ts);
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if (pdata->exit_platform_hw)
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if (pdata && pdata->exit_platform_hw)
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pdata->exit_platform_hw();
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input_unregister_device(ts->input);
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@ -389,10 +473,19 @@ static const struct i2c_device_id tsc2007_idtable[] = {
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MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);
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#ifdef CONFIG_OF
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static const struct of_device_id tsc2007_of_match[] = {
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{ .compatible = "ti,tsc2007" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, tsc2007_of_match);
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#endif
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static struct i2c_driver tsc2007_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "tsc2007"
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.name = "tsc2007",
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.of_match_table = of_match_ptr(tsc2007_of_match),
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},
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.id_table = tsc2007_idtable,
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.probe = tsc2007_probe,
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@ -14,9 +14,9 @@ struct tsc2007_platform_data {
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int fuzzy;
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int fuzzz;
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int (*get_pendown_state)(void);
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void (*clear_penirq)(void); /* If needed, clear 2nd level
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interrupt source */
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int (*get_pendown_state)(struct device *);
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/* If needed, clear 2nd level interrupt source */
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void (*clear_penirq)(void);
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int (*init_platform_hw)(void);
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void (*exit_platform_hw)(void);
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};
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