3 * Henrik Nordstrom <henrik@henriknordstrom.net>
5 * SPDX-License-Identifier: GPL-2.0+
10 #include <asm/arch/gpio.h>
13 static int axp209_write(enum axp209_reg reg, u8 val)
15 return i2c_write(0x34, reg, 1, &val, 1);
18 static int axp209_read(enum axp209_reg reg, u8 *val)
20 return i2c_read(0x34, reg, 1, val, 1);
23 static u8 axp209_mvolt_to_cfg(int mvolt, int min, int max, int div)
30 return (mvolt - min) / div;
33 int axp209_set_dcdc2(int mvolt)
38 cfg = axp209_mvolt_to_cfg(mvolt, 700, 2275, 25);
40 /* Do we really need to be this gentle? It has built-in voltage slope */
41 while ((rc = axp209_read(AXP209_DCDC2_VOLTAGE, ¤t)) == 0 &&
48 rc = axp209_write(AXP209_DCDC2_VOLTAGE, current);
56 int axp209_set_dcdc3(int mvolt)
58 u8 cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25);
60 return axp209_write(AXP209_DCDC3_VOLTAGE, cfg);
63 int axp209_set_ldo2(int mvolt)
68 cfg = axp209_mvolt_to_cfg(mvolt, 1800, 3300, 100);
70 rc = axp209_read(AXP209_LDO24_VOLTAGE, ®);
74 /* LDO2 configuration is in upper 4 bits */
75 reg = (reg & 0x0f) | (cfg << 4);
76 return axp209_write(AXP209_LDO24_VOLTAGE, reg);
79 int axp209_set_ldo3(int mvolt)
84 cfg = 0x80; /* determined by LDO3IN pin */
86 cfg = axp209_mvolt_to_cfg(mvolt, 700, 3500, 25);
88 return axp209_write(AXP209_LDO3_VOLTAGE, cfg);
91 int axp209_set_ldo4(int mvolt)
94 static const int vindex[] = {
95 1250, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2500,
96 2700, 2800, 3000, 3100, 3200, 3300
100 /* Translate mvolt to register cfg value, requested <= selected */
101 for (cfg = 15; vindex[cfg] > mvolt && cfg > 0; cfg--);
103 rc = axp209_read(AXP209_LDO24_VOLTAGE, ®);
107 /* LDO4 configuration is in lower 4 bits */
108 reg = (reg & 0xf0) | (cfg << 0);
109 return axp209_write(AXP209_LDO24_VOLTAGE, reg);
112 int axp209_init(void)
117 rc = axp209_read(AXP209_CHIP_VERSION, &ver);
121 /* Low 4 bits is chip version */
127 /* Mask all interrupts */
128 for (i = AXP209_IRQ_ENABLE1; i <= AXP209_IRQ_ENABLE5; i++) {
129 rc = axp209_write(i, 0);
137 int axp209_poweron_by_dc(void)
141 if (axp209_read(AXP209_POWER_STATUS, &v))
144 return (v & AXP209_POWER_STATUS_ON_BY_DC);
147 int axp209_power_button(void)
151 if (axp209_read(AXP209_IRQ_STATUS5, &v))
154 axp209_write(AXP209_IRQ_STATUS5, AXP209_IRQ5_PEK_DOWN);
156 return v & AXP209_IRQ5_PEK_DOWN;
159 static u8 axp209_get_gpio_ctrl_reg(unsigned int pin)
162 case 0: return AXP209_GPIO0_CTRL;
163 case 1: return AXP209_GPIO1_CTRL;
164 case 2: return AXP209_GPIO2_CTRL;
165 case 3: return AXP209_GPIO3_CTRL;
170 int axp_gpio_direction_input(unsigned int pin)
172 if (pin == SUNXI_GPIO_AXP0_VBUS_DETECT)
175 u8 reg = axp209_get_gpio_ctrl_reg(pin);
176 /* GPIO3 is "special" */
177 u8 val = (pin == 3) ? AXP209_GPIO3_INPUT : AXP209_GPIO_INPUT;
179 return axp209_write(reg, val);
182 int axp_gpio_direction_output(unsigned int pin, unsigned int val)
184 u8 reg = axp209_get_gpio_ctrl_reg(pin);
187 val = (pin == 3) ? AXP209_GPIO3_OUTPUT_HIGH :
188 AXP209_GPIO_OUTPUT_HIGH;
190 val = (pin == 3) ? AXP209_GPIO3_OUTPUT_LOW :
191 AXP209_GPIO_OUTPUT_LOW;
194 return axp209_write(reg, val);
197 int axp_gpio_get_value(unsigned int pin)
202 if (pin == SUNXI_GPIO_AXP0_VBUS_DETECT) {
203 rc = axp209_read(AXP209_POWER_STATUS, &val);
204 mask = AXP209_POWER_STATUS_VBUS_USABLE;
205 } else if (pin == 3) {
206 rc = axp209_read(AXP209_GPIO3_CTRL, &val);
209 rc = axp209_read(AXP209_GPIO_STATE, &val);
210 mask = 1 << (pin + 4);
215 return (val & mask) ? 1 : 0;
218 int axp_gpio_set_value(unsigned int pin, unsigned int val)
220 return axp_gpio_direction_output(pin, val);