1 // SPDX-License-Identifier: GPL-2.0+
12  * __lsdc_gpio_i2c_set - set the state of a gpio pin indicated by mask
13  * @mask: gpio pin mask
18 	struct lsdc_device *ldev = to_lsdc(li2c->ddev);  in __lsdc_gpio_i2c_set()
20 	u8 val;  in __lsdc_gpio_i2c_set()  local
22 	spin_lock_irqsave(&ldev->reglock, flags);  in __lsdc_gpio_i2c_set()
26 		 * Setting this pin as input directly, write 1 for input.  in __lsdc_gpio_i2c_set()
27 		 * The external pull-up resistor will pull the level up  in __lsdc_gpio_i2c_set()
29 		val = readb(li2c->dir_reg);  in __lsdc_gpio_i2c_set()
30 		val |= mask;  in __lsdc_gpio_i2c_set()
31 		writeb(val, li2c->dir_reg);  in __lsdc_gpio_i2c_set()
33 		/* First set this pin as output, write 0 for output */  in __lsdc_gpio_i2c_set()
34 		val = readb(li2c->dir_reg);  in __lsdc_gpio_i2c_set()
35 		val &= ~mask;  in __lsdc_gpio_i2c_set()
36 		writeb(val, li2c->dir_reg);  in __lsdc_gpio_i2c_set()
38 		/* Then, make this pin output 0 */  in __lsdc_gpio_i2c_set()
39 		val = readb(li2c->dat_reg);  in __lsdc_gpio_i2c_set()
40 		val &= ~mask;  in __lsdc_gpio_i2c_set()
41 		writeb(val, li2c->dat_reg);  in __lsdc_gpio_i2c_set()
44 	spin_unlock_irqrestore(&ldev->reglock, flags);  in __lsdc_gpio_i2c_set()
48  * __lsdc_gpio_i2c_get - read value back from the gpio pin indicated by mask
49  * @mask: gpio pin mask
54 	struct lsdc_device *ldev = to_lsdc(li2c->ddev);  in __lsdc_gpio_i2c_get()
56 	u8 val;  in __lsdc_gpio_i2c_get()  local
58 	spin_lock_irqsave(&ldev->reglock, flags);  in __lsdc_gpio_i2c_get()
60 	/* First set this pin as input */  in __lsdc_gpio_i2c_get()
61 	val = readb(li2c->dir_reg);  in __lsdc_gpio_i2c_get()
62 	val |= mask;  in __lsdc_gpio_i2c_get()
63 	writeb(val, li2c->dir_reg);  in __lsdc_gpio_i2c_get()
65 	/* Then get level state from this pin */  in __lsdc_gpio_i2c_get()
66 	val = readb(li2c->dat_reg);  in __lsdc_gpio_i2c_get()
68 	spin_unlock_irqrestore(&ldev->reglock, flags);  in __lsdc_gpio_i2c_get()
70 	return (val & mask) ? 1 : 0;  in __lsdc_gpio_i2c_get()
76 	/* set state on the li2c->sda pin */  in lsdc_gpio_i2c_set_sda()
77 	return __lsdc_gpio_i2c_set(li2c, li2c->sda, state);  in lsdc_gpio_i2c_set_sda()
83 	/* set state on the li2c->scl pin */  in lsdc_gpio_i2c_set_scl()
84 	return __lsdc_gpio_i2c_set(li2c, li2c->scl, state);  in lsdc_gpio_i2c_set_scl()
90 	/* read value from the li2c->sda pin */  in lsdc_gpio_i2c_get_sda()
91 	return __lsdc_gpio_i2c_get(li2c, li2c->sda);  in lsdc_gpio_i2c_get_sda()
97 	/* read the value from the li2c->scl pin */  in lsdc_gpio_i2c_get_scl()
98 	return __lsdc_gpio_i2c_get(li2c, li2c->scl);  in lsdc_gpio_i2c_get_scl()
106 		i2c_del_adapter(&li2c->adapter);  in lsdc_destroy_i2c()
128 		return -ENOMEM;  in lsdc_create_i2c_chan()
130 	dispipe->li2c = li2c;  in lsdc_create_i2c_chan()
133 		li2c->sda = 0x01;  /* pin 0 */  in lsdc_create_i2c_chan()
134 		li2c->scl = 0x02;  /* pin 1 */  in lsdc_create_i2c_chan()
136 		li2c->sda = 0x04;  /* pin 2 */  in lsdc_create_i2c_chan()
137 		li2c->scl = 0x08;  /* pin 3 */  in lsdc_create_i2c_chan()
139 		return -ENOENT;  in lsdc_create_i2c_chan()
142 	li2c->ddev = ddev;  in lsdc_create_i2c_chan()
143 	li2c->dir_reg = ldev->reg_base + LS7A_DC_GPIO_DIR_REG;  in lsdc_create_i2c_chan()
144 	li2c->dat_reg = ldev->reg_base + LS7A_DC_GPIO_DAT_REG;  in lsdc_create_i2c_chan()
146 	li2c->bit.setsda = lsdc_gpio_i2c_set_sda;  in lsdc_create_i2c_chan()
147 	li2c->bit.setscl = lsdc_gpio_i2c_set_scl;  in lsdc_create_i2c_chan()
148 	li2c->bit.getsda = lsdc_gpio_i2c_get_sda;  in lsdc_create_i2c_chan()
149 	li2c->bit.getscl = lsdc_gpio_i2c_get_scl;  in lsdc_create_i2c_chan()
150 	li2c->bit.udelay = 5;  in lsdc_create_i2c_chan()
151 	li2c->bit.timeout = usecs_to_jiffies(2200);  in lsdc_create_i2c_chan()
152 	li2c->bit.data = li2c;  in lsdc_create_i2c_chan()
154 	adapter = &li2c->adapter;  in lsdc_create_i2c_chan()
155 	adapter->algo_data = &li2c->bit;  in lsdc_create_i2c_chan()
156 	adapter->owner = THIS_MODULE;  in lsdc_create_i2c_chan()
157 	adapter->dev.parent = ddev->dev;  in lsdc_create_i2c_chan()
158 	adapter->nr = -1;  in lsdc_create_i2c_chan()
160 	snprintf(adapter->name, sizeof(adapter->name), "lsdc-i2c%u", index);  in lsdc_create_i2c_chan()
174 	drm_info(ddev, "%s(sda pin mask=%u, scl pin mask=%u) created\n",  in lsdc_create_i2c_chan()
175 		 adapter->name, li2c->sda, li2c->scl);  in lsdc_create_i2c_chan()