Lines Matching +full:i2c +full:- +full:mux
1 // SPDX-License-Identifier: GPL-2.0-only
3 * I2C multiplexer using GPIO API
8 #include <linux/i2c.h>
9 #include <linux/i2c-mux.h>
10 #include <linux/platform_data/i2c-mux-gpio.h>
25 static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val) in i2c_mux_gpio_set() argument
31 gpiod_set_array_value_cansleep(mux->ngpios, mux->gpios, NULL, values); in i2c_mux_gpio_set()
36 struct gpiomux *mux = i2c_mux_priv(muxc); in i2c_mux_gpio_select() local
38 i2c_mux_gpio_set(mux, chan); in i2c_mux_gpio_select()
45 struct gpiomux *mux = i2c_mux_priv(muxc); in i2c_mux_gpio_deselect() local
47 i2c_mux_gpio_set(mux, mux->data.idle); in i2c_mux_gpio_deselect()
68 return -EINVAL; in i2c_mux_gpio_get_acpi_adr()
74 return -ERANGE; in i2c_mux_gpio_get_acpi_adr()
86 return -EINVAL; in i2c_mux_gpio_get_acpi_adr()
91 static int i2c_mux_gpio_probe_fw(struct gpiomux *mux, in i2c_mux_gpio_probe_fw() argument
94 struct device *dev = &pdev->dev; in i2c_mux_gpio_probe_fw()
95 struct device_node *np = dev->of_node; in i2c_mux_gpio_probe_fw()
102 if (is_of_node(dev->fwnode)) { in i2c_mux_gpio_probe_fw()
104 return -ENODEV; in i2c_mux_gpio_probe_fw()
106 adapter_np = of_parse_phandle(np, "i2c-parent", 0); in i2c_mux_gpio_probe_fw()
108 dev_err(&pdev->dev, "Cannot parse i2c-parent\n"); in i2c_mux_gpio_probe_fw()
109 return -ENODEV; in i2c_mux_gpio_probe_fw()
114 } else if (is_acpi_node(dev->fwnode)) { in i2c_mux_gpio_probe_fw()
116 * In ACPI land the mux should be a direct child of the i2c in i2c_mux_gpio_probe_fw()
119 acpi_handle dev_handle = ACPI_HANDLE(dev->parent); in i2c_mux_gpio_probe_fw()
125 return -EPROBE_DEFER; in i2c_mux_gpio_probe_fw()
127 mux->data.parent = i2c_adapter_id(adapter); in i2c_mux_gpio_probe_fw()
128 put_device(&adapter->dev); in i2c_mux_gpio_probe_fw()
130 mux->data.n_values = device_get_child_node_count(dev); in i2c_mux_gpio_probe_fw()
132 mux->data.n_values, sizeof(*mux->data.values), in i2c_mux_gpio_probe_fw()
136 return -ENOMEM; in i2c_mux_gpio_probe_fw()
151 mux->data.values = values; in i2c_mux_gpio_probe_fw()
153 if (fwnode_property_read_u32(dev->fwnode, "idle-state", &mux->data.idle)) in i2c_mux_gpio_probe_fw()
154 mux->data.idle = I2C_MUX_GPIO_NO_IDLE; in i2c_mux_gpio_probe_fw()
162 struct gpiomux *mux; in i2c_mux_gpio_probe() local
168 mux = devm_kzalloc(&pdev->dev, sizeof(*mux), GFP_KERNEL); in i2c_mux_gpio_probe()
169 if (!mux) in i2c_mux_gpio_probe()
170 return -ENOMEM; in i2c_mux_gpio_probe()
172 if (!dev_get_platdata(&pdev->dev)) { in i2c_mux_gpio_probe()
173 ret = i2c_mux_gpio_probe_fw(mux, pdev); in i2c_mux_gpio_probe()
177 memcpy(&mux->data, dev_get_platdata(&pdev->dev), in i2c_mux_gpio_probe()
178 sizeof(mux->data)); in i2c_mux_gpio_probe()
181 ngpios = gpiod_count(&pdev->dev, "mux"); in i2c_mux_gpio_probe()
183 dev_err(&pdev->dev, "no valid gpios provided\n"); in i2c_mux_gpio_probe()
184 return ngpios ?: -EINVAL; in i2c_mux_gpio_probe()
186 mux->ngpios = ngpios; in i2c_mux_gpio_probe()
188 parent = i2c_get_adapter(mux->data.parent); in i2c_mux_gpio_probe()
190 return -EPROBE_DEFER; in i2c_mux_gpio_probe()
192 muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values, in i2c_mux_gpio_probe()
193 ngpios * sizeof(*mux->gpios), 0, in i2c_mux_gpio_probe()
196 ret = -ENOMEM; in i2c_mux_gpio_probe()
199 mux->gpios = muxc->priv; in i2c_mux_gpio_probe()
200 muxc->priv = mux; in i2c_mux_gpio_probe()
204 root = i2c_root_adapter(&parent->dev); in i2c_mux_gpio_probe()
206 muxc->mux_locked = true; in i2c_mux_gpio_probe()
208 if (mux->data.idle != I2C_MUX_GPIO_NO_IDLE) { in i2c_mux_gpio_probe()
209 initial_state = mux->data.idle; in i2c_mux_gpio_probe()
210 muxc->deselect = i2c_mux_gpio_deselect; in i2c_mux_gpio_probe()
212 initial_state = mux->data.values[0]; in i2c_mux_gpio_probe()
224 gpiod = devm_gpiod_get_index(&pdev->dev, "mux", i, flag); in i2c_mux_gpio_probe()
230 mux->gpios[i] = gpiod; in i2c_mux_gpio_probe()
232 if (!muxc->mux_locked) in i2c_mux_gpio_probe()
236 gpio_dev = &gpiod->gdev->dev; in i2c_mux_gpio_probe()
237 muxc->mux_locked = i2c_root_adapter(gpio_dev) == root; in i2c_mux_gpio_probe()
240 if (muxc->mux_locked) in i2c_mux_gpio_probe()
241 dev_info(&pdev->dev, "mux-locked i2c mux\n"); in i2c_mux_gpio_probe()
243 for (i = 0; i < mux->data.n_values; i++) { in i2c_mux_gpio_probe()
244 u32 nr = mux->data.base_nr ? (mux->data.base_nr + i) : 0; in i2c_mux_gpio_probe()
245 unsigned int class = mux->data.classes ? mux->data.classes[i] : 0; in i2c_mux_gpio_probe()
247 ret = i2c_mux_add_adapter(muxc, nr, mux->data.values[i], class); in i2c_mux_gpio_probe()
252 dev_info(&pdev->dev, "%d port mux on %s adapter\n", in i2c_mux_gpio_probe()
253 mux->data.n_values, parent->name); in i2c_mux_gpio_probe()
270 i2c_put_adapter(muxc->parent); in i2c_mux_gpio_remove()
276 { .compatible = "i2c-mux-gpio", },
285 .name = "i2c-mux-gpio",
292 MODULE_DESCRIPTION("GPIO-based I2C multiplexer driver");
295 MODULE_ALIAS("platform:i2c-mux-gpio");