Lines Matching +full:scl +full:- +full:open +full:- +full:drain
13 #include <linux/i2c-algo-bit.h>
14 #include <linux/platform_data/i2c-gpio.h>
24 struct gpio_desc *scl; member
35 * valid for pins configured as open drain (i.e. setting the value
42 gpiod_set_value_cansleep(priv->sda, state); in i2c_gpio_setsda_val()
46 * Toggle SCL by changing the output value of the pin. This is used
47 * for pins that are configured as open drain and for output-only
55 gpiod_set_value_cansleep(priv->scl, state); in i2c_gpio_setscl_val()
62 return gpiod_get_value_cansleep(priv->sda); in i2c_gpio_getsda()
69 return gpiod_get_value_cansleep(priv->scl); in i2c_gpio_getscl()
75 #define setsda(bd, val) ((bd)->setsda((bd)->data, val))
76 #define setscl(bd, val) ((bd)->setscl((bd)->data, val))
77 #define getsda(bd) ((bd)->getsda((bd)->data))
78 #define getscl(bd) ((bd)->getscl((bd)->data))
85 i2c_lock_bus(&priv->adap, I2C_LOCK_ROOT_ADAPTER); \
86 *val = get##wire(&priv->bit_data); \
87 i2c_unlock_bus(&priv->adap, I2C_LOCK_ROOT_ADAPTER); \
94 i2c_lock_bus(&priv->adap, I2C_LOCK_ROOT_ADAPTER); \
95 set##wire(&priv->bit_data, val); \
96 i2c_unlock_bus(&priv->adap, I2C_LOCK_ROOT_ADAPTER); \
101 WIRE_ATTRIBUTE(scl);
107 struct i2c_algo_bit_data *bit_data = &priv->bit_data; in i2c_gpio_incomplete_transfer()
110 i2c_lock_bus(&priv->adap, I2C_LOCK_ROOT_ADAPTER); in i2c_gpio_incomplete_transfer()
114 udelay(bit_data->udelay); in i2c_gpio_incomplete_transfer()
117 for (i = pattern_size - 1; i >= 0; i--) { in i2c_gpio_incomplete_transfer()
119 udelay(bit_data->udelay / 2); in i2c_gpio_incomplete_transfer()
121 udelay((bit_data->udelay + 1) / 2); in i2c_gpio_incomplete_transfer()
123 udelay(bit_data->udelay); in i2c_gpio_incomplete_transfer()
126 i2c_unlock_bus(&priv->adap, I2C_LOCK_ROOT_ADAPTER); in i2c_gpio_incomplete_transfer()
135 return -EINVAL; in fops_incomplete_addr_phase_set()
152 return -EINVAL; in fops_incomplete_write_byte_set()
170 * If there will be a debugfs-dir per i2c adapter somewhen, put the in i2c_gpio_fault_injector_init()
171 * 'fault-injector' dir there. Until then, we have a global dir with in i2c_gpio_fault_injector_init()
175 i2c_gpio_debug_dir = debugfs_create_dir("i2c-fault-injector", NULL); in i2c_gpio_fault_injector_init()
180 priv->debug_dir = debugfs_create_dir(pdev->name, i2c_gpio_debug_dir); in i2c_gpio_fault_injector_init()
181 if (!priv->debug_dir) in i2c_gpio_fault_injector_init()
184 debugfs_create_file_unsafe("scl", 0600, priv->debug_dir, priv, &fops_scl); in i2c_gpio_fault_injector_init()
185 debugfs_create_file_unsafe("sda", 0600, priv->debug_dir, priv, &fops_sda); in i2c_gpio_fault_injector_init()
186 debugfs_create_file_unsafe("incomplete_address_phase", 0200, priv->debug_dir, in i2c_gpio_fault_injector_init()
188 debugfs_create_file_unsafe("incomplete_write_byte", 0200, priv->debug_dir, in i2c_gpio_fault_injector_init()
196 debugfs_remove_recursive(priv->debug_dir); in i2c_gpio_fault_injector_exit()
208 of_property_read_u32(np, "i2c-gpio,delay-us", &pdata->udelay); in of_i2c_gpio_get_props()
210 if (!of_property_read_u32(np, "i2c-gpio,timeout-ms", ®)) in of_i2c_gpio_get_props()
211 pdata->timeout = msecs_to_jiffies(reg); in of_i2c_gpio_get_props()
213 pdata->sda_is_open_drain = in of_i2c_gpio_get_props()
214 of_property_read_bool(np, "i2c-gpio,sda-open-drain"); in of_i2c_gpio_get_props()
215 pdata->scl_is_open_drain = in of_i2c_gpio_get_props()
216 of_property_read_bool(np, "i2c-gpio,scl-open-drain"); in of_i2c_gpio_get_props()
217 pdata->scl_is_output_only = in of_i2c_gpio_get_props()
218 of_property_read_bool(np, "i2c-gpio,scl-output-only"); in of_i2c_gpio_get_props()
244 if (ret == -EINVAL) in i2c_gpio_get_desc()
245 retdesc = ERR_PTR(-EPROBE_DEFER); in i2c_gpio_get_desc()
248 if (ret == -ENOENT) in i2c_gpio_get_desc()
249 retdesc = ERR_PTR(-EPROBE_DEFER); in i2c_gpio_get_desc()
251 if (PTR_ERR(retdesc) != -EPROBE_DEFER) in i2c_gpio_get_desc()
263 struct device *dev = &pdev->dev; in i2c_gpio_probe()
264 struct device_node *np = dev->of_node; in i2c_gpio_probe()
270 return -ENOMEM; in i2c_gpio_probe()
272 adap = &priv->adap; in i2c_gpio_probe()
273 bit_data = &priv->bit_data; in i2c_gpio_probe()
274 pdata = &priv->pdata; in i2c_gpio_probe()
290 * "open drain" it means something outside of our control is making in i2c_gpio_probe()
291 * this line being handled as open drain, and we should just handle in i2c_gpio_probe()
292 * it as any other output. Else we enforce open drain as this is in i2c_gpio_probe()
295 if (pdata->sda_is_open_drain) in i2c_gpio_probe()
299 priv->sda = i2c_gpio_get_desc(dev, "sda", 0, gflags); in i2c_gpio_probe()
300 if (IS_ERR(priv->sda)) in i2c_gpio_probe()
301 return PTR_ERR(priv->sda); in i2c_gpio_probe()
304 * If the SCL line is marked from platform data or device tree as in i2c_gpio_probe()
305 * "open drain" it means something outside of our control is making in i2c_gpio_probe()
306 * this line being handled as open drain, and we should just handle in i2c_gpio_probe()
307 * it as any other output. Else we enforce open drain as this is in i2c_gpio_probe()
310 if (pdata->scl_is_open_drain) in i2c_gpio_probe()
314 priv->scl = i2c_gpio_get_desc(dev, "scl", 1, gflags); in i2c_gpio_probe()
315 if (IS_ERR(priv->scl)) in i2c_gpio_probe()
316 return PTR_ERR(priv->scl); in i2c_gpio_probe()
318 if (gpiod_cansleep(priv->sda) || gpiod_cansleep(priv->scl)) in i2c_gpio_probe()
321 bit_data->setsda = i2c_gpio_setsda_val; in i2c_gpio_probe()
322 bit_data->setscl = i2c_gpio_setscl_val; in i2c_gpio_probe()
324 if (!pdata->scl_is_output_only) in i2c_gpio_probe()
325 bit_data->getscl = i2c_gpio_getscl; in i2c_gpio_probe()
326 bit_data->getsda = i2c_gpio_getsda; in i2c_gpio_probe()
328 if (pdata->udelay) in i2c_gpio_probe()
329 bit_data->udelay = pdata->udelay; in i2c_gpio_probe()
330 else if (pdata->scl_is_output_only) in i2c_gpio_probe()
331 bit_data->udelay = 50; /* 10 kHz */ in i2c_gpio_probe()
333 bit_data->udelay = 5; /* 100 kHz */ in i2c_gpio_probe()
335 if (pdata->timeout) in i2c_gpio_probe()
336 bit_data->timeout = pdata->timeout; in i2c_gpio_probe()
338 bit_data->timeout = HZ / 10; /* 100 ms */ in i2c_gpio_probe()
340 bit_data->data = priv; in i2c_gpio_probe()
342 adap->owner = THIS_MODULE; in i2c_gpio_probe()
344 strlcpy(adap->name, dev_name(dev), sizeof(adap->name)); in i2c_gpio_probe()
346 snprintf(adap->name, sizeof(adap->name), "i2c-gpio%d", pdev->id); in i2c_gpio_probe()
348 adap->algo_data = bit_data; in i2c_gpio_probe()
349 adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; in i2c_gpio_probe()
350 adap->dev.parent = dev; in i2c_gpio_probe()
351 adap->dev.of_node = np; in i2c_gpio_probe()
353 adap->nr = pdev->id; in i2c_gpio_probe()
365 dev_info(dev, "using lines %u (SDA) and %u (SCL%s)\n", in i2c_gpio_probe()
366 desc_to_gpio(priv->sda), desc_to_gpio(priv->scl), in i2c_gpio_probe()
367 pdata->scl_is_output_only in i2c_gpio_probe()
383 adap = &priv->adap; in i2c_gpio_remove()
392 { .compatible = "i2c-gpio", },
401 .name = "i2c-gpio",
414 printk(KERN_ERR "i2c-gpio: probe failed: %d\n", ret); in i2c_gpio_init()
427 MODULE_DESCRIPTION("Platform-independent bitbanging I2C driver");
429 MODULE_ALIAS("platform:i2c-gpio");